Methods and systems for accurate and precise fuel supply control for continuous-flow of gaseous fuel to an internal combustion engine over a large dynamic power range, including a dual-stage valve that allows optimal controla first stage in the form of a voice-coil driven electronic pressure regulator, and a second stage in the form of a voice-coil-driven choked-flow valve; monitoring the pressure of the fuel intermediate the two stages and making appropriate adjustments to the first stage via a pressure actuator loop; feeding the gaseous fuel mixture through a unitary block assembly into the second stage; monitoring the pressure of the air/fuel mixture and making appropriate adjustments to the second stage via a valve actuator control loop.

Methods and systems for accurate and precise fuel supply control for continuous-flow of gaseous fuel to an internal combustion engine over a large dynamic power range, including a dual-stage valve that allows optimal controla first stage in the form of a voice-coil driven electronic pressure regulator, and a second stage in the form of a voice-coil-driven choked-flow valve; monitoring the pressure of the fuel intermediate the two stages and making appropriate adjustments to the first stage via a pressure actuator loop; feeding the gaseous fuel mixture through a unitary block assembly into the second stage; monitoring the pressure of the air/fuel mixture and making appropriate adjustments to the second stage via a valve actuator control loop.

The invention relates to an electromagnetically operable high-pressure gas valve, which is embodied as a pilot valve with a pilot seat and a pilot opening and a main seat with a main opening, with the pilot opening connecting a high-pressure side with a low-pressure side of the valve and it being possible to close it via a main sealing element, the main opening connecting the high-pressure side to the low-pressure side of the valve and it being possible to close it by a main sealing element, and the valve comprising a pilot anchor which acts upon the pilot sealing element, and comprising a main anchor, which acts upon the main sealing element, with the valve comprising a coil that is suitably embodied and arranged to act upon the pilot anchor and the main anchor such that a pilot stroke and a main stroke are independent from each other.

A pressure-reducing valve includes a valve chamber, a pressure regulating chamber, a partition member, which has a communication hole, and a valve body. The partition member includes the communication hole and a valve seat. The valve body includes a body portion and a rod portion. The valve seat includes a plurality of inclined surfaces, which have different inclination angles with respect to the central axis of the valve body. The circumference wall of the communication hole and the valve seat are connected by a coupling portion. The inclination angle of the valve seat is varied discretely such that the valve seat comes into contact with the valve body at a position more that is further the radially outward from the central axis of the valve body than the coupling portion.

A gas valve, in particular a metering valve for a gaseous medium, having a valve washer (10) which is arranged in the gas valve so as to be able to move with respect to a longitudinal axis (8), and having a valve plate (12) with a valve seat (19) formed thereon, wherein the valve washer (10) interacts with the valve seat (19) for opening and closing the gas valve, and having a first circumferential sealing edge (30) between the valve seat (19) and the valve washer (10). The valve washer (10) has a central opening (13) through which the gaseous medium passes, wherein the first circumferential sealing edge (30) surrounds the central opening (13) and wherein, in the central opening (13), there is formed a first pressure face (25) upon which the gaseous medium acts in the closing direction. Furthermore, there is arranged on the valve washer (10) a second pressure face (26) which is formed radially outside the first circumferential sealing edge (30) and on which the gaseous medium also acts. The first pressure face (25) and the second pressure face (26) are connected via a connection passage (15; 17; 24) formed in the valve plate (12).

A valve device includes: a main valve element dividing a valve element space of a housing into first and second pressure chambers; a sealing member configured to isolate the first and second pressure chambers from each other; a first pilot passage including one end communicating with a primary passage, the other end communicating with the second pressure chamber, and a first restrictor; a second pilot passage including a second restrictor and formed at the main valve element; a pilot valve element configured to open and close the second pilot passage; a drive mechanism configured to, when a current flows through the drive mechanism, drive the pilot valve element such that the pilot valve element opens the second pilot passage against biasing force of a biasing member; and a pin coupling the main valve element and the pilot valve element to each other.

A device for mixing a gaseous fuel into an oxygen-containing gas flow of a gas-powered internal combustion engine includes a housing component having an inlet that connects to a gaseous fuel supply conduit and a slit that opens into an intake pipe. The slit has a longitudinal extension that is oriented approximately perpendicular to the axial direction of the intake pipe. A valve body is movable relative to the housing component. An annular gap between the valve body and an outlet opening of the housing component has a cross-sectional area that varies in accordance with changes in the position of the valve body relative to the housing component. The annular gap determines the flow-through cross-section of a passageway between the inlet and the outlet. Furthermore, a gaseous fuel flow exiting from the slit is directed approximately perpendicular to the axial direction of the intake pipe.

A gaseous fuel engine system includes a quick start fuel system having a pressurized gaseous fuel supply, a fuel feed conduit and a quick start fuel admission valve. The fuel feed conduit is coupled to an intake conduit for the engine at a downstream fuel admission location. A main fuel system is coupled to the intake conduit at an upstream fuel admission location. The quick start fuel admission valve is electrically actuated to admit a pressured gaseous fuel from the pressurized gaseous fuel supply for quick starting the gaseous fuel internal combustion engine. The quick start fuel may have a fuel composition different than a fuel composition of the main fuel.

An electronically controlled regulator may include a pressure regulating valve. The pressure regulating valve may include a valve shaft, a valve seat, and a discharge pressure regulating unit. The discharge pressure regulating unit may regulate a pressure of a fluid by causing the valve shaft to reciprocate through driving of an electric motor electronically controlled to change a distance between a valve body and the valve seat. A high-pressure fluid introduced from an introduction port may be discharged from a discharge port as a depressurized fluid at a set pressure on a side of a discharge pressure chamber while being depressurized and regulated. A seat diameter of the valve seat, a first seal diameter of a first seal member on an atmospheric pressure chamber side, and a second seal diameter of a second seal member on a pressure control chamber side may be substantially the same.

A fuel system that in at least some implementations includes a carburetor having a fluid passage, a solenoid, a valve, a driver circuit and a control circuit. The valve may be moved by the solenoid between an open position permitting fluid flow through the fluid passage and a closed position at least partially inhibiting fluid flow through the fluid passage. The driver circuit and control circuit are communicated with the solenoid to contribute to providing power to the solenoid and controlling actuation of the solenoid. The driver circuit and control circuit provide a first magnitude of power to the solenoid to initially change the solenoid from its closed position to its open position and a second magnitude of power to maintain the solenoid in its open position wherein the second magnitude of power is less than the first magnitude.