A fuel pump, including a driven impeller, which rotates in a pump housing and on the two sides comprises guide blades that each delimit a ring of blade chambers, and further including partial ring-shaped channels, which are arranged on both sides in the region of the guide blades in the pump housing and which form delivery chambers with the blade chambers for delivering fuel, wherein an inlet channel leads into the one delivery chamber and the other delivery chamber leads into an outlet channel, and mutually opposing blade chambers are connected to each other. The cross-sectional surface of the partial ring-shaped channel arranged on the inlet side decreases toward the end of the partial ring-shaped channel to zero. The region in which the cross-sectional surface decreases extends over an angular region of more than 45.

A fuel pump for a direct injection internal combustion engine having a housing defining a pump chamber. Driven and idler toothed gears are rotatably mounted within the pump chamber so that the driven and idler gears are in mesh with each other at a predetermined location in the pump chamber. A fluid inlet is formed through the housing and open to an inlet subchamber in the pump chamber. A fluid outlet is also formed through the housing and open to an outlet subchamber in the pump chamber. A pressure relief passageway fluidly connects the inlet subchamber to the outlet subchamber and a valve is disposed in series with the pressure relief passageway. A control circuit controls the actuation of the valve to control the pump pressure at the pump outlet.

A fuel pump for a direct injection internal combustion engine having a housing defining a pump chamber. Driven and idler toothed gears are rotatably mounted within the pump chamber so that the driven and idler gears are in mesh with each other at a predetermined location in the pump chamber. A fluid inlet is formed through the housing and open to an inlet subchamber in the pump chamber. A fluid outlet is also formed through the housing and open to an outlet subchamber in the pump chamber. A pressure relief passageway fluidly connects the inlet subchamber to the outlet subchamber and a valve is disposed in series with the pressure relief passageway. A control circuit controls the actuation of the valve to control the pump pressure at the pump outlet.

A pulse free fuel pump device designed to provide smooth, continuous fuel flow without pressure pulses is disclosed. The device includes a housing, a first impeller operating at a relatively low RPM to initiate fuel pressurization, and a second impeller operating at a relatively higher RPM to achieve final high pressure. A stator is positioned between the impellers to stabilize the fuel flow, and a rotor, connected to both impellers via a shaft provides synchronized rotation and reduces pulsation. The device is integrated into a fuel system comprising a fuel tank, a fuel filter, and a high-pressure fuel rail distributing fuel to injectors. The method of operation involves installing the pump in the fuel supply line, connecting it to the turbine's electrical system, and dynamically controlling rotor speed based on fuel demand, ensuring consistent, pulse-free fuel delivery to the combustion chamber.

A pulse free fuel pump device designed to provide smooth, continuous fuel flow without pressure pulses is disclosed. The device includes a housing, a first impeller operating at a relatively low RPM to initiate fuel pressurization, and a second impeller operating at a relatively higher RPM to achieve final high pressure. A stator is positioned between the impellers to stabilize the fuel flow, and a rotor, connected to both impellers via a shaft provides synchronized rotation and reduces pulsation. The device is integrated into a fuel system comprising a fuel tank, a fuel filter, and a high-pressure fuel rail distributing fuel to injectors. The method of operation involves installing the pump in the fuel supply line, connecting it to the turbine's electrical system, and dynamically controlling rotor speed based on fuel demand, ensuring consistent, pulse-free fuel delivery to the combustion chamber.

A fuel system for a hydrogen-fueled internal combustion engine vehicle. A compressor/expander is installed in fluid connection between the fuel tank and the engine's fuel delivery system. The compressor/expander operates in compressor mode when the hydrogen fuel in the fuel tank is below a pressure desired for fuel delivery. It operates in expander mode when the hydrogen fuel in the fuel tank is above the desired pressure. The compressor/expander has inlet and outlet metering valves. A controller receives fuel tank pressure and temperature measurements and calculates timing of the metering valves to maintain the desired pressure into the fuel delivery system.

A fuel system for a hydrogen-fueled internal combustion engine vehicle. A compressor/expander is installed in fluid connection between the fuel tank and the engine's fuel delivery system. The compressor/expander operates in compressor mode when the hydrogen fuel in the fuel tank is below a pressure desired for fuel delivery. It operates in expander mode when the hydrogen fuel in the fuel tank is above the desired pressure. The compressor/expander has inlet and outlet metering valves. A controller receives fuel tank pressure and temperature measurements and calculates timing of the metering valves to maintain the desired pressure into the fuel delivery system.