Disclosed is a turbocharged internal combustion piston engine system that includes a waste-heat recovery system. The waste-heat recovery system involves injecting heated water into the cylinders during combustion to increase engine power and efficiency and to reduce emissions. The engine can be a spark or compression ignition type of engine, and can utilize fuels including but not limited to diesel, natural gas, gasoline, and ethanol. The engine also includes a turbocharger that utilizes a turbine in the exhaust gas flow to provide power to a compressor in the intake air flow to pressurize the intake air and provide additional charge flow to the engine to increase engine output.

A system for method for emptying a gas storage tank of a vehicle is presented. In one example, engine valve timing is adjusted to facilitate reducing pressure within the gas storage tank. The system and method may extend the use of the gas stored in the gas storage tank.

A device, and associated methods, for converting a fuel-injection engine, originally intended for use with a first fuel, allow the engine to operate with a different, second fuel (e.g., bioethanol, alone or mixed with unleaded fuel(s)). The device delivers an adapted injection signal to an injector based on an original injection signal (SI) received from an engine control unit. An analyzing, circuit includes a measuring circuit, to measure the SI; a detecting circuit, to detect an end time of the SI when the measured signal drops below an end threshold; and an updating circuit, to update a value of the end threshold, depending on the measured signal. A signal generator produces a complementary injection signal (SC) starting from the end time. A switching circuit transmits the SI to the injector, then delivers the SC to the injector. The SI and the SC together form the adapted injection signal.

A method for estimating a specific gravity of a gaseous fuel is described. The gaseous fuel may power an engine and the engine may include a cylinder, a gas valve configured to supply an intake port of the cylinder with the gaseous fuel, a gas rail configured to deliver the gaseous fuel to the gas valve, and a microprocessor adapted to perform the method. The method may comprise establishing a pressure wave in the gas rail by opening and closing the gas valve, wherein the pressure wave travels at the speed of sound in the gaseous fuel. The method may further comprise determining a frequency of the pressure wave in the gas rail, and estimating the specific gravity of the gaseous fuel based on the frequency of the pressure wave.

A system for determining properties of fuel supplied to an internal combustion (IC) engine and for adjusting operations of the IC engine based on the determined properties. The system includes an air-flow throttle configured to control the air supplied to the IC engine; a fuel-flow throttle configured to control the fuel supplied to the IC engine; and an engine control module (ECM) configured to receive readings from and control operation of the throttles. The ECM is configured to perform a fuel-air determination program where the ECM determines a percent-error air-to-fuel ratio (AF) based on a true AF ratio compared to an ideal AF ratio. The ECM is configured to perform a fuel property determination and adjustment program in which the ECM is configured to adjust operations of the IC engine based on a fuel property value determined using the percent-error AF ratio.

A fuel delivery arrangement for a generator can include a throttle-mixing assembly including a mixer body defining a main port extending between an air inlet end and a mixed air-fuel outlet end and defining a fuel inlet port extending into the main port, a Venturi structure located within the main port and being configured to mix fuel received from the fuel inlet port with air received from the air inlet end and to deliver an air-fuel mixture to the air-fuel outlet, a fuel control valve assembly, mounted to the mixer body, including a first valve and a first actuator arranged to control a flow of the fuel passing through the fuel inlet port, and a throttle control valve assembly, mounted to the mixer body, including a second valve and a second actuator arranged to control a flow of the air-fuel mixture passing through the main port.

An apparatus and method for pressurizing and supplying a gaseous fuel to an engine includes a first supply and a second supply of the gaseous fuel stored as a compressed gas. A pressure regulator regulates a pressure of the gaseous fuel fluidly received from the first supply or the second supply, a compressor pressurizes the gaseous fuel fluidly received from the first supply or the second supply, and an accumulator fluidly receives gaseous fuel from the compressor and the pressure regulator. A supply-select valve apparatus is in fluid communication with the first supply and the second supply and is actuatable to fluidly connect the first supply with the compressor or the pressure regulator, and to fluidly connect the second supply with the compressor or the pressure regulator.

A liquefied petroleum (LP) gas fuel system includes a fuel source to store liquid LP gas and a fuel supply system to draw liquid LP gas from the fuel source and selectively deliver vapor LP gas and liquid LP gas into a plurality of cylinders of an internal combustion engine. The fuel supply system includes a plurality of liquid LP gas injectors, a plurality of vapor LP gas injectors, a fuel pump to drive liquid LP gas fuel from the fuel source to the plurality of liquid injectors, and a fuel pressure regulator to deliver vapor LP gas to the plurality of vapor injectors. The fuel system includes a controller to actuate the fuel pressure regulator to deliver vapor LP gas to the plurality of vapor injectors and actuate the fuel pump to deliver liquid LP gas to the plurality of liquid injectors.

A method for operating a spark-ignition internal combustion engine, wherein the internal combustion engine is operated using hydrogen as fuel, a lambda injection value is a value that indicates the formation of a mixture on the basis of an injection fuel quantity (F.sub.injection) to be supplied to a combustion chamber of the internal combustion engine and an air quantity (L) to be supplied to the combustion chamber from outside of the internal combustion engine, wherein the injection fuel quantity (F.sub.injection) is determined, at least in some ranges, independently of a lambda target value. In order to ensure adequate operation of hydrogen engines, the injection fuel quantity (F.sub.injection) is determined, at least in some ranges, at least on the basis of the air quantity (L).