The present invention is a system and method for adapting and modifying an existing mono-fuel delivery system for an internal combustion engine to run as a bi-fuel system by reusing and repurposing OEM components of the mono-fuel system. The bi-fuel system makes use of an integration plate that may be mounted to the system fuel filter in substantially the same location as the fuel filter is mounted in the mono-fuel configuration. The integration plate also may deliver either fuel types into the existing engine fuel intake port thus the system does not require the creation of a secondary fuel intake port for the secondary fuel. The integration plate may also be situated such that it minimizes the space it must use within the engine compartment and it may use the preexisting engine mounting points designed for the fuel filter in the mono-fuel system.

A method for using biodiesel fuel in compression ignition internal combustion engines is described, the biodiesel fuel being present in a light oil diesel-biodiesel blend with a percentage of biodiesel greater than 7%, in which this percentage of biodiesel higher than 7% causes an increase in the viscosity of the mixture, the increase in viscosity negatively affecting the cold start of the engine; the method reduces the biodiesel concentration to below 7% in the starting phase of the engine, the reduction in concentration being achieved by adding light oil diesel to the light oil diesel-biodiesel blend.

A supplemental fuel system for a machine with an engine is configured to monitor a voltage of a power supply of the machine based on voltage data acquired by a voltage sensor where the power supply is configured to receive power from an alternator driven by the engine, compare the voltage to a voltage threshold, and control an electronic lock off valve positioned between a supplemental fuel tank and an air supply system for the engine such that the electronic lock off valve is (i) closed to prevent a supplemental fuel from being provided from the supplemental fuel tank to the to the air supply system in response to the voltage being less than the voltage threshold and (ii) open or openable to permit the supplemental fuel to be provided to the air supply system in response to the voltage being greater than the voltage threshold.

A natural gas system for an intake manifold of a dual fuel engine is provided. The natural gas system includes a heat exchanger configured to exchange heat with a first stream of natural gas passing therethrough. The natural gas system further includes a temperature regulating assembly positioned downstream of the heat exchanger with respect to the first stream of the natural gas. The temperature regulating assembly includes a conduit having an inlet and an outlet. The temperature regulating assembly also includes a supply line in selective fluid communication with the conduit. The temperature regulating assembly further includes a temperature sensing assembly provided within the conduit. Further, the introduction of the second stream is based on a temperature of the natural gas within the conduit.

A hydro-diesel engine system, including: (a) a hydrogen gas supply and a liquid diesel fuel supply; (b) a bubbilizer configured to agitatedly mix some of the hydrogen gas into diesel fuel to form a mixture of small bubbles of hydrogen gas in the liquid diesel fuel which is then sent into a hydro-diesel engine; together with (c) a system for chemically mixing some of the hydrogen gas with the diesel fuel prior to the diesel fuel entering the bubbilizer.

Present invention optimizes utilization of different fuels in various single and multi-fueled engines. The fuel system and optimization controller links fuel properties (physical, reactionary, combustion etc.) to on-board computer systems during the refueling process. This link enables fuel and additive producers an opportunity to optimize combustion parameters of their proprietary fuel blends to increase performance, fuel efficiencies and reduce emissions.

An improved fuel system for a dual-fuel internal combustion engine. During normal operation, the primary fuel passes through a pressure regulator before arriving at a primary fuel rail. Further, pressurized secondary fuel is delivered to both a secondary fuel rail and to the pressure regulator for purposes of regulating the output pressure of the primary fuel that is delivered to the primary fuel rail. When the pressure at the primary fuel supply or between the primary fuel supply and the pressure regulator drops below a minimum operating pressure, the pressure regulator is isolated from the secondary fuel and the secondary fuel continues to be pressurized until it reaches a suitable pressure for operating in a limp mode. Then, the secondary fuel, which is pressurized to greater than a normal operating pressure, may be injected at the higher pressure for improved performance of the engine in the limp mode.

An object is to provide an exhaust-gas control device for a gas engine whereby NOx is reduced and fuel consumption is improved by performing NOx restriction operation when an environmental or geographical condition in which the amount of NOx emission needs to be temporarily restricted is satisfied, and otherwise performing stable operation focusing on the fuel consumption. The exhaust-gas control device for a gas engine includes: a basic operation mode unit (80) using the first target ignition timing and the first target air-fuel rate at which the fuel consumption rate is the optimum; a low-NOx operation mode unit (82) using the second target ignition timing retarded from the first target ignition timing and the second target air-fuel rate increased from the first target air-fuel rate; a NOx reduction demand determination unit (86) for determining whether to restrict the amount of NOx emission temporarily, and an switching unit to operation mode (84) for switching the operation mode to the low NOx operation mode while the reduction demand condition is satisfied by the NOx reduction demand determination unit.

A fuel injector in a fuel system having a first fuel supply of a first fuel and a second fuel supply of a second fuel includes a multifunctional control valve movable in the fuel injector to control admission of the first fuel to a combined-fuel outlet passage, and to control a timing and an injection pressure of a fuel charge containing the first fuel. In an embodiment the first fuel includes a compression-ignition fuel such as diesel and the second fuel includes an alcohol fuel such as methanol. Related apparatus and methodology is disclosed.

A mechanical fuel lockout switch for a dual fuel engine includes a mechanical fuel valve actuatable between a first position and a second position to selectively control fuel flow to the dual fuel engine from a first fuel source through a first fuel line and a second fuel source through a second fuel line. The mechanical fuel lockout switch may also include a fuel lockout apparatus coupled to the mechanical fuel valve. The mechanical fuel valve may be configured to allow communication between the first fuel source and the dual fuel engine and prevent communication between the second fuel source and the dual fuel engine while in the first position, and prevent communication between the first fuel source and the dual fuel engine while in the second position.