System and method for use of purge gas to terminate internal combustion engine operation

Abstract

A purge gas injection system for internal combustion engines is disclosed. The system comprises a purge gas container filled with a sufficient purge gas to interrupt the combustion cycle of the engine, equipped with a controllable flow device capable of initiating and terminating flow from the container upon demand, with tubing connected to the purge gas container to direct the purge gas to a nozzle mounted on the combustion air intake of the engine. The system can be operated whenever the undesired conditions of dieseling or engine run-on are experienced and the operator of the engine may cause the purge gas to flow into the combustion air intake to defeat the undesirable run-on conditions.

Claims

1. A system for operating a gaseous injection system for terminating continued operation in an internal combustion engine, comprising: a. a gas container containing purge gas in a quantity of purge gas to interrupt the combustion in the internal combustion engine, b. a controllable metering valve for initiating and terminating purge gas flow from the gas container on demand, c. the metering valve is actuated to produce a single metered amount of purge gas flow, d. tubing connecting the gas container to a nozzle to direct the purge gas into the combustion air intake of the internal combustion engine, and e. an interlock control circuit with the engine ON/OFF switch that inhibits system operation unless the engine ON/OFF switch is in the OFF position, whereby the operator of the engine can controllably introduce at least one metered amount of purge gas flow into the engine combustion air intake and rapidly alter the air-fuel mixture to suppress combustion.

2. The system for operating a gaseous injection system of claim 1, in which the metering valve has an electro-mechanical controllable actuator which is operated by a push button switch enabling the flow device to allow flow for as long as the push button switch is depressed.

3. The system for operating a gaseous injection system of claim 1, in which the nozzle distributes a dispersed purge of the combustion air intake volume of the engine.

4. The system for operating a gaseous injection system of claim 2, in which the power for the electro-mechanical controllable actuator is directly from an engine voltage source.

5. An apparatus for operating a gaseous injection system for terminating continued operation in an internal combustion engine, comprising: a. a purge gas container containing high pressure purge gas in a quantity suitable for multiple purge operations, b. an accumulator chamber to collect a fixed amount of purge gas from the purge gas container in a quantity of purge gas sufficient to interrupt the combustion in the internal combustion engine b. a controllable valve for initiating and terminating purge gas flow from the accumulator chamber on demand, c. the controllable valve is operated by a push button that actuates flow from the accumulator, d. tubing connecting the gas container to a nozzle to direct the purge gas from the accumulator into the combustion air intake of the internal combustion engine, and an interlock control circuit with the engine ON/OFF switch that inhibits system operation unless the engine ON/OFF switch is in the OFF position, whereby the operator of the engine can controllably introduce at least one metered amount of purge gas flow from the accumulator into the engine combustion air intake and rapidly alter the air-fuel mixture to suppress combustion.

6. The apparatus for operating a gaseous injection system of claim 5, in which the metering valve has an electro-mechanical controllable actuator which is operated by a push button switch enabling the flow device to allow flow for as long as the push button switch is depressed.

7. The apparatus for operating a gaseous injection system of claim 5, in which the nozzle distributes the purge gas in the combustion air intake volume of the engine.

8. The apparatus for operating a gaseous injection system of claim 6, in which the power for the electro-mechanical actuator is directly from an engine voltage source.

9. The apparatus for operating a gaseous injection system of claim 5, in which the purge gas is either carbon dioxide, nitrogen, argon, helium, or mixtures thereof.

10. The apparatus for operating a gaseous injection system of claim 5, in which the purge gas is taken from a stream of engine exhaust gases which have been recycled and collected in the purge gas container.

11. The apparatus for operating a gaseous injection system in claim 10, in which the recycled exhaust gas collected for purge gas has been compressed by a compressor to a pressure higher than the engine combustion air intake pressure.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention, together with further advantages thereof, may best be understood by reference to the following description taken in conjunction with the accompanying drawings.

(2) FIG. 1 shows an implementation of the proposed solution to introduce purge gas into the combustion intake of a carbureted engine. A container of purge gas is fitted with a means for controlling the release of the gas and actuator means for control of the flow through a tube directing the purge gas to the carburetor or other intake for the engine.

(3) FIG. 2.a is an expanded view showing an embodiment where the system outlet nozzle held is in place on a flame arrestor/carburetor inlet using an existing hold down threaded rod and nut.

(4) FIG. 2.b shows an alternate location for the nozzle depicted in FIG. 2.a.

(5) FIG. 2.c shows an arrangement where the purge gas is introduced directly into an engine intake manifold.

(6) FIG. 3 shows a mechanical extension device used to transfer rotary motion and torque to remotely open and close the valve on the purge gas container

(7) FIG. 4 shows a mechanical actuation means used with a flexible cable control embodiment used to transmit mechanical force or energy by the movement of an inner cable and a lever feature to remotely open and close the purge gas container valve.

(8) FIG. 5 shows an electro-mechanical actuation embodiment to remotely control the flow of purge gas from the gas container.

(9) FIG. 6 shows a tank device used to capture and store the combustion byproducts as the purge gas.

DETAILED DESCRIPTION

(10) An invention is disclosed for the implementation of an apparatus or system to interrupt combustion in an internal combustion engine. Such an invention is desirable in those applications where dieseling or run-on might occur after shutoff of the ignition system and such run-on is not desired for reasons of operating preference or safety. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order not to unnecessarily obscure the present invention.

(11) Throughout this disclosure, the gas used for interruption of engine combustion is referred to as purge gas, inert gas or other more specific terms. When considering the embodiments described herein, the gas most appropriate to an individual application should be selected to ensure rapid alteration of the air-fuel ratio away from stoichiometric air-fuel ratio and interrupt the dieseling or run-on. As such, in any embodiment where the purge gas is described and exemplary description notes that carbon dioxide, CO2, or nitrogen, N2, could be used; it is not intended to limit the invention scope. The selection of purge gas may depend on the resources available to a person of skill implementing the invention and are not intended to be limiting in any way. As such, any of the gases used in examples might be substituted in the particular embodiment of the invention by inert gases such as Helium (He), Neon (Ne), Nitrogen (N2), Argon (Ar), Krypton (Kr), Xenon (Xe) or by other gases that are compatible with the device or engine design such as Oxygen (O2), engine exhaust gases, or water vapor and be within the scope of contemplated embodiments. It is the function of the selected purge gas to be safely introduced to rapidly alter of the air-fuel ratio away from stoichiometric air-fuel ratio and interrupt the dieseling or run-on being experienced in the internal combustion engine or other power cycle device. All of these gases described here can be interchanged in alternate embodiments and still accomplish the intent of the invention.

(12) Additionally, in many of the exemplary embodiments described herein, considerations might be described for implementation in a boat with a carbureted engine, but these too are not intended to impose any limitations on the scope of the invention embodiments described here. As a matter of example, the term carburetor inlet or intake manifold are used herein; but the term intake plenum, intake area, or intake chamber can be substituted for manifold, and the same result accomplished for an alternate configuration. Additionally, a person of skill would obviously appreciate the exemplary embodiments, configurations and features could readily could be used in other types of vehicles or systems that have a problem with engine dieseling or run-on such as automobile, recreational vehicles, gas turbines, jet turbines, or any other device designed to output mechanical power as a result of an internal combustion power cycle.

(13) FIG. 1 shows an implementation 100 of the proposed solution to introduce purge gas into the combustion intake 5 of a carbureted engine. A container of purge gas is fitted with a means for controlling the release of the gas and actuator means for control of the flow through a tube directing the purge gas to the carburetor or other intake for the engine. In the embodiment disclosed in FIG. 1, container of purge gas 1 is arranged with an actuator 2 to initiate a means 6 for controlling the release of the inert gas and directing it into tubing 3 that connects the purge gas container to a nozzle 4 located, in this embodiment, on the carburetor housing 5. The nozzle 4 is configured, located and oriented to direct the purge gas into the carbureted engine intake manifold. Finally, in FIG. 1 the nozzle 4 that directs the purge gas to the carburetor inlet is held down and secured by a fastener 11, which in at least one embodiment, can be a nut 11 on the housing threaded rod 26.

(14) When choosing the location and orientation of the nozzle in this embodiment the volume and the rate of flow of the purge gas into the carburetor or intake manifold, the volume of the intake manifold or intake plenum and resulting air-fuel ratios in downstream distribution systems should be factored into an objective of the solution to cause the rapid alteration of the air-fuel ratio away from stoichiometric air-fuel ratio and interrupt the dieseling or run-on. Additionally, any interference in the carburetor that may impede the flow of the purge gas into the intake manifold, or affect normal operation of the engine, should be considered.

(15) In the embodiment illustrated in FIG. 1 the control means is a valve, but a person of skill would appreciate there are many implementation options and that depending on the pressure of the purge gas, a pressure regulator might be necessary. Additionally, in other embodiments implemented consistent with FIG. 1, the control means 6 could be augmented with a flow metering or flow limiting devices such as a metering valve, flow restricting orifice, accumulator chamber, or other means intended to ensure a specific or controlled volume and flow rate of purge gas is sent to the engine's combustion air intake system. Control means or valve 6 could also be located anywhere along the path of tubing 3 provided there is a means for its manipulation to the open, closed or proper regulation position or setting needed to accomplish the rapid purge.

(16) In some embodiments, the purge gas or CO2 container 1 will be a commercially available container rated for the pressure and temperature of the purge gas being used. In other embodiments, depending on the scale of the application, the gas container 1 may be larger and be considered a tank. In smaller scale embodiments the container 1 will be a smaller volume often referred to as a bottle. The purge gas container selected must meet other safety requirements and hence will likely be equipped with a properly rated shutoff or isolation valve as designated in mechanical engineering safety standards for use in applications where it is used to open or close the supply of compressed purge gas such as CO2. The embodiment chosen and design considerations may also merit use of a system pressure relief valve to prevent container 1 overpressure.

(17) The tubing 3 shown in FIG. 1 should be selected giving consideration to the material suitability and rating required for the system operating conditions. Additionally, as previously disclosed, overpressure protection should be included as necessary. The tubing, which may be flexible or rigid tubing, depending upon the application needs, is used to connect the outlet of the purge gas container 1 to a nozzle 4 on the carburetor. It should be understood that in other embodiments, when being applied to engines or internal combustion devices that are not carbureted, the point of connection to an intake manifold will be a different configuration, but still within the contemplated invention disclosed herein.

(18) The nozzle 4 is a mechanical device that, by its throat size and, perhaps a venturi inner shape, serves to set the direction and velocity of the purge gas when entering the carburetor or intake manifold. The nozzle 4 may be made of metal or any other material suitable for the operating condition requirements of the engine or other internal combustion device. In the embodiment shown in FIG. 1 the nozzle 4 is directing the purge gas into the center of the carburetor inlet. In variations to this embodiment, the nozzle may be located where needed to conform to other design considerations, such as directly on the intake manifold, as long as it enables the rapid introduction of the purge gas into the carburetor or intake manifold. It can be attached to the carburetor cover, which in the case of marine applications, there may be a flame arrestor over the carburetor, or by any means necessary to direct the purge gas into the carburetor inlet.

(19) Specific embodiments of the nozzle 4 might need to consider the following requirements: Setting up the angle of injection to direct the CO2 into the carburetor inlet as efficiently as possible, while minimizing interference with normal operation; And; utilizing an attachment mechanism which precludes the introduction of any foreign parts into the carburetor during normal operation or during operation of the purge system. One approach in many marine applications is to fit the nozzle 4 over the flame arrestor hold down threaded rod, and hold the nozzle in place with a nut as illustrated in greater detail in FIG. 2.a. However, the orientation of nozzle 4 in FIG. 2a is not limiting and, as further illustrated in FIG. 2.b and previously disclosed, nozzle 4 may be located anywhere near the inlet, provided the purge gas is directed to the inlet for rapid purge of the carburetor or intake manifold and the carburetor or intake manifold is held down with threaded rod 26 and hold down device 27.

(20) The purge gas bottle 3 location will depend upon the type of actuator used to open and close the valve and therefore the supply of purge gas. The valve actuator can be configured to be operated locally or operated remotely. If operated locally, the valve and handle 2 are typically mounted on the CO2 purge gas bottle 1, which requires the bottle 1 to be conveniently mounted where the vehicle operator can open or close the valve 6 from their normal operating position (i.e. The driver's seat). If remote actuation is provided, the CO2 bottle 1 could be mounted in any convenient storage location and remote actuation method chosen have a lever, handle or pushbutton located near the operator to initiate the purge gas in the system. Either mechanical or electro-mechanical devices would be added to the FIG. 1 embodiment to support remote operation.

(21) FIG. 2.a is an expanded view showing an embodiment where the system outlet nozzle 4 held is in place on a flame arrestor/carburetor inlet using an existing hold down threaded rod 26 and hold down device 11, which in the illustrated embodiment is a nut. In this configuration, the nozzle 4 is located directly above the center of the carburetor inlet 25 and directs the gas straight down. A person of skill could appreciate that alternate orientations and methods of fastening the nozzle 4 could be used and still accomplish the rapid introduction of purge gas into the carburetor or intake manifold.

(22) FIG. 2.b shows an embodiment with a variation of location for the nozzle 4 depicted in FIG. 2.a. In this configuration, the modified nozzle 21 is not located directly above the carburetor inlet and therefore is designed to inject the gas at an angle, as opposed to the straight down direction shown in FIG. 2a, such that the purge gas is still directed towards the carburetor inlet. The nozzle 4 design is intended to reduce the amount of gas needed by ensuring the flow is directly to the carburetor inlet in a manner that bypasses any obstructions and is rapidly dispersed into the carburetor inlet.

(23) FIG. 2.c shows an arrangement where the purge gas is introduced directly into an engine intake manifold or plenum 40. The FIG. 2.c embodiment shows the purge tubing 3 as a split line format with two manifold inlet locations 41 and 42. Any embodiment using a single inlet location, two as shown in FIG. 2.c, or more locations might be used depending on the need for dispersal of the purge gas throughout the intake manifold or intake plenum necessary to cause the rapid purge of intake air-fuel. In an alternate embodiment, the inlet location could be located at a mechanical spacer between the carburetor and the manifold and implemented without changes to the intake manifold.

(24) FIG. 3 shows a mechanical extension device 200 used to transfer rotary motion and torque to remotely open and close the valve on the purge gas container 1. Rotation of the valve actuator handle 24 located on a console or dash 12, or other suitably convenient location, enables the operator to remotely cause the valve 6 on the purge inert gas container 1 to open or close. The valve 6 could be one that has a threaded stem that transfers rotary motion into linear movement that opens and closes the valve, or it could be a quarter-turn valve, such as a ball valve, that also relies on rotary motion to open or close. The operator would then only have to operate the valve open for a very short duration. As previously disclosed in other embodiments, the valve 6 might also be a metering valve that allows a specific volume or open timing prior to shutting off the flow from the purge container. The valve 6 could also be located anywhere along the path of tubing 3 provided there is a means for its manipulation to the open, closed or proper regulation position or setting needed to accomplish the rapid purge.

(25) In the embodiment depicted in FIG. 3, the torque is transferred from the actuator handle 24 through rigid extension rods 7 and the universal joints 8 are used as needed to adjust for misalignment between the valve 6 and the actuator handle 24. The rotary motion could be transferred by other configurations that use rigid cables, gear boxes or other means suitable to provide adequate torque transfer and allows for purge gas flow and purge gas isolation following the discharge of an adequate amount of purge gas from the container 1 to the tubing 3.

(26) FIG. 4 shows an alternate embodiment comprising a mechanical actuation means 300 comprised of a mechanical input device 14 and a flexible cable control used to transmit mechanical force or energy by the movement of an inner cable and a lever feature to remotely open and close the purge gas container valve. The mechanical input device 14 may be a lever, handle, or pushbutton as necessary to any specific application of the invention disclosed herein.

(27) In the embodiment illustrated in FIG. 4, the system 300 comprises a mechanical input device 14 with a flexible cable control 9 used to transmit mechanical force or energy by the movement of an inner cable and a hinged device 23, 22 and 10 to remotely open and close the valve 6 on the purge gas container using linear motion. The flexible cable control may be known to persons of skill as a Bowden cable, but this association is not intended to limit the scope of this embodiment in any way. In this embodiment, pushing the button 14 will cause the upper lever arm 10 to move towards the lower lever arm 23 thereby causing the valve stem 22 to open the valve on the purge gas container 1. The upper lever arm 10 and the lower lever arm 23 are connected by a pivot point 28 as shown in FIG. 4. The embodiment illustrated in FIG. 4 uses an alternate valve 6 design that operates by direct linear motion of the valve stem. This motion causes the valve 6 to open and close such as the pin valve found on smaller CO2 or other compressed gas containers 1. Alternately, this embodiment could be configured to require the lever or pushbutton 14 to be pulled in order to actuate the valve and cause the flow of purge gas from the container 1 through the tubing 3 to the combustion air intake of the device being stopped. In these types of push configurations, springs 13 are used as necessary to return the mechanism to the closed position. As with previously described embodiments, the valve 6 could also be located anywhere along the path of tubing 3 provided there is a means for its manipulation to the open, closed or proper regulation position or setting needed to accomplish the rapid purge.

(28) FIG. 5 shows an embodiment using an electric pushbutton system 400 to remotely control the flow of purge gas from the CO2 container, by control of an electrically actuated valve 16. Pushing the button 17 causes the electrically actuated valve 16 to open and permits the flow of purge gas. Releasing the pushbutton closes the valve and stops the flow of purge gas. FIG. 5 also shows a regulator 15 that would be included as necessary to meet the pressure limitations of downstream components such as the electrically actuated valve and the tubing. In an alternate embodiment, the system button could be aligned to actuate 15 a purge gas container shutoff or pressure regulation valve that in previous embodiments was manually controlled.

(29) In another embodiment, the system button could be replaced or augmented by an automated control system that senses engine operating conditions where dieseling is likely to occur and automatically injects or enables operator actuated injection of a controlled volume of purge gas when the engine shut-off command is given via the OFF switch. Sensed conditions could include engine temperature, exhaust gas flow or gas monitoring or other operating variable that indicates the conditions for dieseling are present. In an alternate embodiment, an engine RPM indication provides the indication that the engine or system is continuing to operate after the ignition is in the OFF position. This automatic arming of the controls would enable the system to be designed to operate to actuate and interrupt dieseling without operator involvement to arm the system as part of the engine shutdown process. In an alternate embodiment, the actuation switch and arming could be included in the ignition switch contacts to actuate the system as part of engine shutoff via a special setting on the engine ignition switch or as a normal engine shutdown feature. These alternate embodiments enable a fully automatic, sensed condition actuation; operator initiated actuation using separate switches or buttons; or routine actuation as part of normal shutdown every time the engine is stopped. A person of skill could appreciate that any of these options can be implemented and be within the contemplated scope of the invention disclosed herein.

(30) A remote electrical actuator is an alternate embodiment that would use a switch or pushbutton 17 located near the engine operator (i.e. Located on the dash as was illustrated in FIG. 3). The switch or pushbutton 17 could control an electric actuated valve on or downstream of the CO2 container, such as an electric solenoid valve 16 that is powered by the vehicle voltage 18. When the switch/pushbutton is operated ON and OFF, it causes the actuator to open and close the supply of purge gas. The CO2 container is connected to the carburetor with tubing 3 as described in previously disclosed embodiments. As previously disclosed, a pressure regulator may be needed to meet the pressure rating of the tubing, valve and any other pressurized components. This pressure regulator 15 is shown in FIG. 5.

(31) The tubing 3 between the purge gas bottle 1 and the injection nozzle 4 can be routed to adapt to design needs not shown in the illustrations of this application and be within the contemplated scope of the invention. Selection of the tubing 3 needs to consider the service conditions in terms of the operating pressures and temperatures in the proposed configurations, material compatibility, as well as vibration or other fatigue that may impact the working life of the implementation.

(32) If a remote actuator is used, this will involve mounting a switch, lever, handle, or pushbutton on the dash or any convenient location within reach of the engine operator. While not absolutely necessary, the remote actuator pushbutton device 17 used should be a spring return type 13 such that it will cause the flow of CO2 while force is applied and stop the flow of CO2 when the force is removed.

(33) In a further and alternate embodiment, the need for purge bottle change out could be avoided if some of the combustion exhaust gases created during normal operation were stored in a container, and then injected into the carburetor when dieseling was occurring. The post-combustion exhaust gases contain a large percentage of purge gases (e.g., CO2, N2, other gas previously disclosed) and would also displace oxygen if injected into the carburetor. This approach is illustrated in system 500 shown in FIG. 6.

(34) FIG. 6 depicts an appropriately sized container mounted near the engine exhaust manifold. The container 20 and tubing 3 in this embodiment will likely need to be rated for the exhaust gas temperature and pressure of the engine. In this embodiment, a metal or other appropriately rated tubing material 3, and a check valve 19, connects the container to the exhaust manifold such that some of the exhaust gases will flow to and be stored in the container. An inlet filter not shown in FIG. 6 may be needed to improve the quality of the purge gas stored in the container.

(35) In the embodiment illustrated in FIG. 6, the container 20 is connected to the carburetor with tubing 3 and using one of the remote actuator means previously disclosed to open and close the actuation valve 16. When desired, the engine operator may open the valve to inject the stored exhaust gases into the carburetor. The post combustion, low oxygen gases stored in the container will be admitted to the carburetor and interrupt the combustion in a manner similar to previously disclosed embodiments.

(36) If necessary to ensure adequate flow rates, a compressor not shown in FIG. 6 could be included in the system such that the post-combustion gases are stored at a higher pressure. This would improve the flow during the purge process.

(37) In every application of this invention it will be necessary to ensure materials are used that are capable of performing under the applicable operating conditions, including the pressure, temperature, humidity and loads applied to the materials, as well as comply with any applicable Codes and Standards in effect. Additionally, if commercially available hardware is used, then follow any recommendations from those manufacturers.

(38) Variations of the embodiments previously disclosed can be achieved using the following embodiment details or feature considerations. A person of skill would appreciate the situations where these variations might occur, all while comporting with the scope of the invention disclosed herein. The variations include, but are not limited to:

(39) As previously disclosed the use of flow control devises such as flow restrictions or orifices, flow meters and flow control valves to regulate the flow of the purge gas and allow for the system to be used on a wide range of engine sizes or purge gas volume needs. Additionally, the design of the nozzle 4 can be altered to achieve these objectives without the addition of more individual parts to the system disclosed.

(40) Further automation of the system by use of additional switches, electro-mechanically operated valves, relays or other control devices for system operation, such as causing the momentary flow of purge gas by just placing the engine switch in the OFF position and using the OFF position signal to actuate the purge system. This integrated implementation would be of assistance to the operator of any vehicle where the system is implemented and simplify its actuation.

(41) In other embodiments, the use of additional sensing instrumentation and controls to foresee a dieseling or run-on situation or the severity of a dieseling situation would be helpful to the system. These may include sensors 29 as shown in FIG. 5 that detect particular engine conditions such as hot engine temperature, higher fuel temperature, combustion when the ignition is off (i.e., dieseling), etc. and use this information to automate the injection of purge gas to those conditions when it is needed and alternately or in combination determining the quantity of purge needed to shutdown the engine.

(42) As previously disclosed for the various embodiments, the nozzle 4 location can be installed in other injection locations such as the fuel intake manifold or anywhere that the purge would eliminate the dieseling condition

(43) Alternate embodiments may consider the problem presented by inadvertent actuation. This could be remedied by embodiments that include interlocks to prevent inadvertent actuation, such as requiring the key to be in the OFF position, or no spark present, before allowing the injection/purge to occur.

(44) Additionally, embodiments of the system could consider the need to minimize the risk of thermal shock damage by storing the purge gas at a low pressure such that the temperature drop is minimized when the gas is expanded into the carburetor. Yet another embodiment alternative to this would be using a longer length of tubing going to the nozzle, routing along engine exhaust components, or using heating elements that allow the purge gas to be warmed as it travels down the tubing before entering the carburetor.

(45) The operation of the system embodiments disclosed herein is described in the following. A person of skill would appreciate that many variations of this operation might be necessitated by embodiment alternatives disclosed herein, including additional steps not disclosed in the following. As such, this operational description is not limiting with respect to the scope of the invention disclosed in this application.

(46) Considering the embodiment illustrated in FIG. 1, with a filled CO2 or other purge gas bottle 1 and when in manual mode of operation and when called upon to stop a dieseling engine, the system is placed into operation by opening the valve 6 until the supply of CO2 commences, and then closing the valve 6 almost immediately but after sufficient flow has occurred to stop the combustion. Typically, only a very short duration supply or burst of CO2 is needed to stop the dieseling problem. To conserve the supply of purge gas and minimize the amount of cold expanded gas rapidly injected into the engine, and hence the damage that may occur due to thermal shock, the operator likely wants to only inject the minimum amount of CO2 necessary to interrupt combustion. A recommended sequence of steps could be to turn the key of the operating engine or other power cycle system to OFF and check for a dieseling or run-on problem, proceed with a shot or injection of the desired amount of CO2 purge gas when and as needed by opening then closing the CO2 container valve 6. Through trial and error the operator will determine the amount of CO2 needed and when dieseling or run-on conditions are likely.

(47) With the remote actuator embodiment, the operation is somewhat automated by placing the system 400 (see FIG. 5) into operation by manipulating the switch, lever, handle, or pushbutton 17 depending on the embodiment. The quantity and sequence of steps for controlling the purge are as discussed for the manual mode example previously presented.

(48) Although the foregoing invention has been described in some detail for purposes of clarity of understanding, it will be apparent that certain changes and modifications may be practiced within the scope of the appended claims. Accordingly, the present embodiments are to be considered as illustrative and not restrictive, and the invention is not to be limited to the details given herein, but may be modified within the scope and equivalents of the appended claims.

(49) 1. A gaseous injection system for terminating continued operation in an internal combustion engine, comprising:

(50) a. a gas container providing purge gas in a quantity of purge gas sufficient to rapidly interrupt the combustion in the internal combustion engine,

(51) b. a controllable flow device for initiating and terminating purge gas flow from the gas container,

(52) c. tubing connecting the gas container to a mechanical fitting capable of directing the purge gas into the combustion air intake of the internal combustion engine,

(53) whereby the operator of the engine can controllably introduce purge gas flow into the air intake and rapidly alter the air-fuel mixture to suppress combustion.

(54) 2. The gaseous injection system of claim 1, in which the gas container is at a very high pressure relative to the combustion air intake of the engine and the controllable flow device enables rapid expansion of the gas such that the gas directed into the combustion air intake is at a significantly lower temperature relative to the ambient operating conditions of the engine.

(55) 3. The gaseous injection system of claim 1, in which the controllable flow device enables metered flow amounts to be actuated by the operator.

(56) 4. The gaseous injection system of claim 3, in which the controllable flow device includes a metering flow orifice.

(57) 5. The gaseous injection system of claim 1, in which the purge gas is either carbon dioxide, nitrogen, argon, helium, or mixtures thereof.

(58) 6. The gaseous injection system of claim 1, in which the purge gas is taken from a stream of engine exhaust gases which have been collected in the gas container.

(59) 7. The gaseous injection system of claim 6, in which the recycled exhaust gas collected for purge gas has been compressed by a compressor to a pressure significantly higher than the engine combustion air intake pressure.

(60) 8. The gaseous injection system of claim 1, in which the mechanical fitting is a spread shaped nozzle to enable a rapid purge of the combustion air intake volume of the engine.

(61) 9. The gaseous injection system of claim 8, in which the nozzle is a venturi at the point of entry into the engine combustion air intake.

(62) 10. The gaseous injection system of claim 8, in which the nozzle angled at the point of entry into the engine combustion air intake.

(63) 11. The gaseous injection system of claim 1, in which the tubing is routed across and attached to the engine in a thermally coupled manner to enable engine heat to warm the purge gas prior to it exiting from the mechanical fitting.

(64) 12. The gaseous injection system of claim 1, in which the controllable flow device can be operated by a remote mechanical mechanism accessible by the engine operator.

(65) 13. An apparatus for operating a gaseous injection system for terminating continued operation in an internal combustion engine, comprising:

(66) a. a gas container providing purge gas in a quantity of purge gas sufficient to rapidly interrupt the combustion in the internal combustion engine,

(67) b. an electro-mechanical controllable flow device for initiating and terminating purge gas flow from the gas container on demand,

(68) c. tubing connecting the gas container to a mechanical fitting capable of directing the purge gas into the combustion air intake of the internal combustion engine,

(69) whereby the operator of the engine can controllably introduce purge gas flow into the engine combustion air intake and rapidly alter the air-fuel mixture to suppress combustion.

(70) 14. The apparatus for operating a gaseous injection system of claim 13, in which the electro-mechanical controllable flow device is a metering valve.

(71) 15. The apparatus for operating a gaseous injection system of claim 13, in which the electro-mechanical controllable flow device is operated by a push button actuation enabling the flow device to allow flow for as long as the push button actuation is depressed.

(72) 16. The apparatus for operating a gaseous injection system of claim 13, in which the electro-mechanical controllable flow device is operated by a push button that actuates only a metered amount of purge gas flow.

(73) 17. The apparatus for operating a gaseous injection system according to claim 15 or 16, further comprising an interlock control circuit with the engine ON/OFF switch that inhibits system operation unless the engine ON/OFF switch is in the OFF position.

(74) 18. The apparatus for operating a gaseous injection system of claim 13, in which the mechanical fitting is a spread shaped nozzle to enable a rapid purge of the combustion air intake volume of the engine.

(75) 19. A method of introducing purge gas to terminate engine-run-on in internal combustion engines, comprising:

(76) a. providing a gas container containing a quantity of purge gas sufficient to rapidly interrupt the combustion in the internal combustion engine,

(77) b. rapidly manipulating a controllable flow device for initiating and terminating purge gas flow from the gas container,

(78) c. enabling flow into tubing connecting the gas container to a mechanical fitting capable of directing the purge gas into the combustion air intake of the internal combustion engine,

(79) whereby the operator of the engine controllably introduces purge gas flow into the air intake and rapidly alters the air-fuel mixture to suppress combustion and defeat the undesireable conditions of dieseling or engine run-on.