Disclosed is a method for estimating an angular position of top dead center for a high-pressure fuel injection pump that forms part of a system for injecting fuel into a motor vehicle engine, the pump including at least one piston moving in a chamber between the top and the bottom dead center, the pump being equipped with a digital control valve for controlling a quantity of fuel, an electrical current being applied to the digital valve as it closes then removed in order to open the digital valve, a movement of the digital valve in the direction of opening creating an induced current which makes it possible to detect a position of start-of-opening of the digital valve. An instant at which the pump piston passes through top dead center is estimated as a function of an instant at which the position of start-of-opening of the digital valve appears.

The present invention relates to a gas heat pump system. A gas heat pump system according to one embodiment of the present invention comprises: a compressor for compressing a refrigerant; a gas engine for driving the compressor; a mixer for mixing air and fuel to generate a mixed gas to be supplied to the gas engine; a mixed gas supply line connected between the mixer and the gas engine; and a supercharger for supercharging the mixed gas supplied to the gas engine through the mixed gas supply line, wherein the supercharger comprises a sealed housing formed by sealing the remaining parts thereof other than an inlet port and an outlet port through which the mixed gas moves into and out of the housing, and a bypass line is provided between the sealed housing and the inlet port of the supercharger so as to resupply a mixed gas in the sealed housing to the inlet port of the supercharger. Therefore, the system can prevent a safety-related accident resulting from the leakage of the mixed gas out of the supplier and can reduce the amount of fuel consumption.

A reformer system may include a reformer device having a fuel inlet, an air inlet and a gas outlet, a first valve set coupled to the fuel inlet and configured to selectively supply a reformer fuel flow from an engine fuel flow to the fuel inlet, a second valve set coupled to the air inlet and configured to selectively supply a reformer air flow from a compressor outlet air flow to the air inlet, and a controller in electrical communication with the first valve set and the second valve set. The controller may determine a target reformer fuel flow based on a target gas flow, determine a target reformer air flow based on the reformer fuel flow and a target air-to-fuel ratio, adjust the reformer fuel flow according to the target reformer fuel flow, and adjust the reformer air flow according to the target reformer air flow.

A gas control system of a non-road gas engine and a gas control method thereof are disclosed by the present disclosure. The gas control system includes a mixer, the mixer is provided with an air inlet, a gas inlet and a mixed gas outlet respectively, the air inlet is provided with a first pressure sensor, the gas inlet is provided with a second pressure sensor and a pressure regulating valve that are spaced apart, and the mixed gas outlet is provided with a third pressure sensor; the first pressure sensor, the second pressure sensor, the pressure regulating valve and the third pressure sensor are respectively electrically connected to a controller, and the controller controls an opening degree of the pressure regulating valve according to pressure information fed back by the first pressure sensor, the second pressure sensor and the third pressure sensor so as to adjust an air-gas ratio of the mixed gas. The system has a simple structure. By disposing a pressure regulating valve at the gas inlet, the pressure of the gas entering the mixer is controlled, and the air-gas ratios required under various working conditions are controlled, which realizes a closed-loop control so that a control range of the air-gas ratio is smaller, the accuracy is higher, and a transient response speed of the engine is improved.

A method for operating a gas engine, or a dual-fuel engine operated in a gas fuel operating mode, the gas engine having a plurality of cylinders, structured to withstand ignition and combustion of an ignitable mixture of a gaseous fuel and combustion air, includes: preparing a non-ignitable premixture of the combustion air and the gaseous fuel; conducting the non-ignitable premixture toward the cylinders; adding further gaseous fuel to the non-ignitable premixture upstream of an inlet-side gas exchange valve via a gas valve assigned to a respective cylinder, so as to convert the non-ignitable premixture into the ignitable mixture; conducting, via the combustion air line, the ignitable mixture toward the cylinders; and providing the ignitable mixture to the respective cylinders.

An internal combustion engine is operated at fuel-rich conditions by adjusting one or more operating parameters such as, for example, a throttle, an ignition timing, a load coupled to the engine, a fuel pressure, power to a supercharger, and power to a preheater to maintain a specified engine speed and a temperature of an exhaust gas. Operating the engine under these conditions allows the engine to function as a reformer producing a synthesis gas comprising hydrogen and carbon monoxide.

The present invention disclosed a system for generating and supplying hydrogen gas to an internal combustion engine. The system comprises at least one hydrogen generator unit configured to generate hydrogen gas from water received from a primary water tank connected to the hydrogen generating unit. The hydrogen generating unit is also connected to an electrical control unit of the hydrogen generator unit which controls supply of power from a power supply unit for the electrolysis of water at the hydrogen generating unit. The hydrogen generating unit also connected to a car electrical control unit whereby through the operation of the electrical control unit of the hydrogen generating unit connected to the car electrical control Unit it enables the system to control activation/deactivation of the hydrogen generating unit, the output rate of the hydrogen to be generated, the quantity of the hydrogen to be supplied to the engine system through a back fire prevention unit disposed between the primary water tank and the engine system.

The invention determines at least one combustion property of a two-phase fuel gas. The invention comprises providing the fuel gas from substantially only a first phase of the fuel gas to a combustion engine and operating the combustion engine such that a first -value is achieved in the combustion process. The invention further provides the fuel gas from substantially only a second of the two phases of the fuel gas to the combustion engine, wherein the second phase is different from the first phase and wherein the same volumetric air/fuel ratio is kept as when the combustion engine was operated with the first -value. The invention determines a second -value when the combustion engine is operated with the fuel gas from substantially only the second of the two phases of the fuel gas and determines at least one first combustion property of the fuel gas based on the second -value.

A method of operating an internal combustion engine, wherein a fuel-air mixture is burnt in the internal combustion engine and the internal combustion engine drives a generator, wherein the generator is connected to a power supply network and delivers power to the power supply network and wherein upon or after detection of a dynamic network fault by which the power delivery of the generator into the power supply network is reduced acceleration of the internal combustion engine is prevented or limited, wherein upon or after the detection of the network fault in the power supply network the fuel feed to the internal combustion engine is increased.

Embodiments of the present invention include a method and apparatus for supplying conditioned natural gas to dual fuel engines.