The present disclosure relates to assessing the intake air flow of industrial engines. For an industrial engine that receives vent gas added to intake air for combustion, a gas concentration sensor is used to measure a concentration of a particular gas, e.g. methane, in the intake air. An amount of the methane component in the intake air flowing to the engine that was added by the vent gas can be determined from the measured concentration of methane in the intake air and a flow rate of the intake air. The intake air flow rate may be directly measured, or calculated using instrumentation which may already be in place for engine air-to-fuel ratio control.

A fuel supply system for propane and other LPG fuels is disclosed for internal combustion engines such as spark-ignited direct-injection (SIDI) engines, with features that help manage both liquid and gaseous phases of the LPG fuel. Preferably adapted for use with replaceable fuel canisters, the ECM-managed system has a hot-soak vapor purge system as well as various sensors and valves to prevent excessive boil-off and to otherwise manage the heat and the related liquid-vapor balance of the fuel supply. Although various control strategies are contemplated in different respects, the system preferably uses an intermediate pressure vessel in which the amount of gravity-fed liquid LPG is monitored using a float sensor or the equivalent, and the system is programmed to intervene through valve controls to vent excessively hot LPG vapors from the pressure vessel directly to the engine's intake manifold as a way of managing the heat and liquid-vapor balance in the pressure vessel, accommodating the vented flow by blending the vented fuel vapors with fuel from liquid rail injectors to still produce the desired overall mass flow rate of the fuel to produce the appropriate power levels from the engine.

This disclosure describes an assembly for gas (e.g., compressed natural gas) storage. The assembly includes multiple gas storage tanks, with each tank coupled to a separate sub-assembly that includes a pressure gauge, shutoff valve, and pressure relief device (PRD), providing for independent pressure monitoring, shutoff, and pressure relief for each of the tanks.

In accordance with one aspect of the present disclosure, a turbocharger includes a compressor having a compressor wheel, a turbine provided within a housing, and an exhaust gas recirculation (EGR) flow path. The EGR flow path includes a first fluid connection in the housing and located in proximity to the turbine, a second fluid connection located in proximity to a trailing edge of the compressor wheel, an EGR control valve disposed between the first fluid connection and the second fluid connection, the EGR control valve configured to selectively operate the turbocharger in a low-heat mode having an EGR up to 50% and an operational mode having an EGR rate typically less than 35%.

Methods and systems, using a controller (20), for performing de-rate operation of an engine (12) is disclosed. Controller (20) includes a de-rate condition detection unit (204), an operational parameter adjustment unit (206), and a de-rate condition monitoring unit (208). De-rate condition detection unit (204) detects a low fuel condition based on a current delivery pressure level of the engine (12) detected at least one of: in a fuel tank (24) and along an inlet fuel rail (38) connecting the fuel tank (24) to the engine (12). Operational parameter adjustment unit (206) performs the de-rate operation on the engine (12) by adjusting one or more operational parameters related to an engine (12) load based on the detected low fuel condition. De-rate condition monitoring unit (208) monitors the detected low fuel condition for a predetermined time period in response to the operational parameter adjustment performed by operational parameter adjustment unit (206).

Gaseous fuel downstream of a heat exchanger can be too cold for fuel system components when the temperature of engine coolant employed as a working fluid in the heat exchanger is too low to elevate gaseous fuel temperature, and it is possible for the engine coolant to freeze. A method of operating a cryogenic pump for controlling discharge temperature of a heat exchanger that vaporizes a process fluid received from the cryogenic pump with heat from a working fluid, where the cryogenic pump includes a piston reciprocatable in a cylinder between a proximate cylinder head and a distal cylinder head, includes monitoring at least one of process fluid temperature and working fluid temperature; retracting the piston during an intake stroke from the proximate cylinder head to the distal cylinder head; and extending the piston in a plurality of incremental discharge strokes until the piston travels from the distal cylinder head back to the proximate cylinder head. At least one of the number of incremental discharge strokes, a length of incremental discharge strokes and a rest period between incremental discharge strokes is selected such that at least one of the process fluid temperature and working fluid temperature is maintained above a predetermined level.

Systems and methods for reducing produced gas venting from a hydrocarbon well, in which the engine driving the pump burns produced gas from the well, the engine made to increase its throttle to burn more gas in response to an increased gas pressure indicator, and an external load such as a generator directed to increase the load on the engine and maintain the engine operating within a desired revolutions-per-minute range to avoid redline condition.

To provide a fluid supply apparatus capable of preventing inconveniences cause by cut of a signal line when a filling hose is separated through an emergency separation pipe joint. The fluid supply apparatus (100: fluid supply apparatus for supplying fluid such as hydrogen gas and gasoline) includes a supply system for transporting fluid such as hydrogen gas and gasoline in a housing main body while measuring flow rate of the fluid; a control mechanism for controlling the supply system; a hose (2) introduced from the supply system and having a nozzle (1) at an end thereof; and a signal line (3) along the hose (2), wherein the signal line (3) is detachable.

A precombustion-chamber type gas engine, comprising includes: a check valve disposed in the precombustion-chamber gas supply passage and configured to block a backflow of fuel gas from a precombustion chamber; a supply pressure control valve which is disposed on an upstream side of the check valve in the precombustion-chamber gas supply passage and which is capable of adjusting a pressure of the fuel gas to be supplied to the precombustion chamber; a torch strength information acquisition device configured to obtain torch strength information correlated to strength of a torch from the injection nozzle, on the basis of a pressure in the main chamber and a pressure in the precombustion chamber; a precombustion-chamber gas supply amount calculation device configured to calculate an amount of the fuel gas to be supplied to a precombustion-chamber gas supply amount, on the basis of the torch strength information and correlation information representing a correlation between the torch strength information, a thermal efficiency, and the precombustion-chamber gas supply amount; and a precombustion-chamber gas supply pressure control device configured to control the supply pressure control valve on the basis of the precombustion-chamber gas supply amount calculated by the precombustion-chamber gas supply amount calculation device.

The invention relates to a fuel injection device for an internal combustion engine comprising at least one central rail which is in fluid communication with at least one primary fuel tank, characterized in that at least one auxiliary fuel pressure accumulator is provided, the internal volume of which is in communication with the central rail via at least one control valve in order to temporarily provide a simultaneous fuel supply to the central rail from the auxiliary fuel pressure accumulator and the primary fuel tank.