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.

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, is 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 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.

A first member having a first lock groove and a second member having a connection hole for insertion of the first member and a second lock groove opened to an inner periphery of the hole, are connected via a lock ring having a circular section and engaging with the grooves. An outer diameter of the ring under a load-free condition is set not less than a diameter of a groove bottom surface of the second lock groove. A reduced-diameter guide hole portion for guiding the ring to the second lock groove while reducing a diameter of the ring, is adjacently disposed short of the second lock groove in an insertion direction of the first member. A depth from an inner peripheral surface of the guide hole portion to a groove bottom surface of the second lock groove is set less than a radius of the circular section of the ring.

The invention relates to an electromagnetically actuatable gas valve for metering a gaseous fuel into a suction tract of a motor, in particular a gas or diesel gas motor, comprising a valve seat (1) which is designed as a flat seat and which has multiple annular webs (3) that are arranged in a concentric manner and are connected via at least one radially running web (4) in order to delimit circular or semicircular through-flow openings (2). The electromagnetically actuatable gas valve further comprises a movable valve plate (5) which sealingly interacts with the valve seat (1) and which has multiple annular sealing webs (6) that are arranged in a concentric manner and can be brought into an overlapping arrangement with the circular or semicircular through-flow openings (2) of the valve seat (1). According to the invention, the rigidity of the valve seat (1) and/or the valve plate (5) is substantially constant in the radial direction, the rigidity of the valve seat (1) being greater than the rigidity of the valve plate (5). The invention further relates to a method for increasing the seal of an electromagnetically actuatable gas valve.

A pressure regulator including an inlet port for receiving a fuel supply, a first outlet port in fluid communication with a main combustion chamber and a second outlet port in fluid communication with a pre-combustion chamber in an engine is provided. A first valve is located within the first outlet port and a first actuator is configured to operate the first valve to regulate a fuel supply through the first outlet port to the main combustion chamber. A second valve is located within the second outlet port and a second actuator is configured to operate the second valve to control a fuel supply through the second outlet port to the pre-combustion chamber.

A bi-fuel and dual-fuel engine variable pressure fuel system is presented facilitating individual or simultaneous use of liquid and gaseous fuels including natural gas, hydrogen and gasoline, through employment of a variable output pressure gaseous fuel regulator incorporating an attached hydraulic amplifying structure communicating with a relatively low pressure fluid servo circuit that may in turn communicate with a variable pressure automotive liquid fuel system to facilitate relatively high pressure gaseous fuel injection.

An apparatus for providing a fuel mixture to an internal combustion engine includes a mixing block. A bore is defined through the mixing block; and a fuel distribution chamber extends from the bore between the inlet side and the outlet side of the mixing block. A flow controller including: a valve including a seat, needle, and stem, defining a flow path configured to throttle flow between the fuel distribution chamber and the bore; a throttle control mechanism configured to translate the stem and needle toward or away from the seat; and a biasing mechanism biasing the throttle control mechanism; a first gas shutoff configured to permit fuel to flow from a first pressurized fuel manifold into the fuel distribution chamber; and a second gas shutoff configured to permit fuel to flow from a second, higher pressure fuel manifold into the fuel distribution chamber.

A device for the feedback-controllable metering of hydrogen may include: a valve seat; a sealing element; and an electromagnetic actuator having a pole core, a solenoid, and an armature coupled to the sealing element. The actuator moves the sealing element along an axis as a function of an electric current in the solenoid. A surface of the pole core and a surface of the armature conjointly form a double cone.

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.