Abstract: An evaporative emissions control system includes a first vent valve configured to selectively open and close a first vent, a second vent valve configured to selectively open and close a second vent, a fuel level sensor configured to sense a fuel level in the fuel tank, a pressure sensor configured to sense a pressure in the fuel tank, an accelerometer configured to measure an acceleration of the vehicle, and a controller configured to regulate operation of the first and second vent valves to provide pressure relief for the fuel tank. The controller is programmed to determine if a refueling event is occurring based one signals indicating the fuel level is increasing, the pressure in the fuel tank is increasing, and the vehicle is not moving, and open at least one of the first and second vent valves based on determining the refueling event is occurring.

Abstract: An evaporative emissions control system includes a first vent valve configured to selectively open and close a first vent, a second vent valve configured to selectively open and close a second vent, a fuel level sensor configured to sense a fuel level in the fuel tank, a pressure sensor configured to sense a pressure in the fuel tank, an accelerometer configured to measure an acceleration of the vehicle, and a controller configured to regulate operation of the first and second vent valves to provide pressure relief for the fuel tank. The controller is programmed to determine if a refueling event is occurring based one signals indicating the fuel level is increasing, the pressure in the fuel tank is increasing, and the vehicle is not moving, and open at least one of the first and second vent valves based on determining the refueling event is occurring.

Abstract: An evaporative emissions control system includes a first vent valve configured to selectively open and close a first vent, a second vent valve configured to selectively open and close a second vent, a fuel level sensor configured to sense a fuel level in the fuel tank, a pressure sensor configured to sense a pressure in the fuel tank, an accelerometer configured to measure an acceleration of the vehicle, and a controller configured to regulate operation of the first and second vent valves to provide pressure relief for the fuel tank. The controller is programmed to determine if a refueling event is occurring based one signals indicating the fuel level is increasing, the pressure in the fuel tank is increasing, and the vehicle is not moving, and open at least one of the first and second vent valves based on determining the refueling event is occurring.

Abstract: A valve assembly for a fuel tank system including a fuel tank having a fuel tank outlet and a purge canister includes a main valve and a safety check valve. The main valve can be configured to move from a closed position to an open position. The main valve can have a main valve first port fluidly coupled to the outlet of the fuel tank and a main valve second port fluidly connected to the purge canister. The safety check valve can be configured to move from an open position to a closed position upon a pressure drop at the fuel tank outlet exceeding a predetermined threshold. The safety check valve can have a safety check valve first port fluidly coupled to the outlet of the fuel tank and a safety check valve second port fluidly coupled to the purge canister.

Abstract: A valve assembly for a fuel tank system including a fuel tank having a fuel tank outlet and a purge canister includes a main valve and a safety check valve. The main valve can be configured to move from a closed position to an open position. The main valve can have a main valve first port fluidly coupled to the outlet of the fuel tank and a main valve second port fluidly connected to the purge canister. The safety check valve can be configured to move from an open position to a closed position upon a pressure drop at the fuel tank outlet exceeding a predetermined threshold. The safety check valve can have a safety check valve first port fluidly coupled to the outlet of the fuel tank and a safety check valve second port fluidly coupled to the purge canister.

Abstract: An evaporative emissions control system includes a first vent valve configured to selectively open and close a first vent, a second vent valve configured to selectively open and close a second vent, a fuel level sensor configured to sense a fuel level in the fuel tank, a pressure sensor configured to sense a pressure in the fuel tank, an accelerometer configured to measure an acceleration of the vehicle, and a controller configured to regulate operation of the first and second vent valves to provide pressure relief for the fuel tank. The controller is programmed to determine if a refueling event is occurring based one signals indicating the fuel level is increasing, the pressure in the fuel tank is increasing, and the vehicle is not moving, and open at least one of the first and second vent valves based on determining the refueling event is occurring.

Abstract: A fuel tank system constructed in accordance to one example of the present disclosure includes a fuel tank, a purge canister and a valve assembly. The valve assembly can be fluidly coupled between the fuel tank and the purge canister. The valve assembly can include a main valve and a safety check valve. The main valve can have a main valve first port fluidly coupled to an outlet of the fuel tank and a main valve second port fluidly connected to the purge canister. The safety check valve can be configured to move from an open position to a closed position upon a pressure drop at the fuel tank outlet exceeding a predetermined threshold. The safety check valve can have a safety check valve first port fluidly coupled to the outlet of the fuel tank and a safety check valve second port fluidly coupled to the purge canister.

Abstract: An evaporative emissions control system includes a first vent valve configured to selectively open and close a first vent, a second vent valve configured to selectively open and close a second vent, a fuel level sensor configured to sense a fuel level in the fuel tank, a pressure sensor configured to sense a pressure in the fuel tank, an accelerometer configured to measure an acceleration of the vehicle, and a controller configured to regulate operation of the first and second vent valves to provide pressure relief for the fuel tank. The controller is programmed to determine if a refueling event is occurring based one signals indicating the fuel level is increasing, the pressure in the fuel tank is increasing, and the vehicle is not moving, and open at least one of the first and second vent valves based on determining the refueling event is occurring.

Abstract: A valve assembly includes a valve body with an interior cavity and one or more supply ports, a control port, and an exhaust port each fluidly connected to the interior cavity. An armature assembly is movable within the interior cavity from a first position to a second position in response to the coil being energized. In some configurations, a regulator body, which is connected to the valve body, has an exhaust passage fluidly connected to the exhaust port. A regulator valve in the regulator body prevents fluid flow out of the exhaust passage when fluid pressure on the regulator valve is at or below a pilot pressure. The regulator valve permits fluid flow out of the exhaust passage when fluid pressure on the regulator valve is greater than the pilot pressure. The valve body is configured to provide fluid from the supply port/ports to the control port.

Abstract: A fuel tank system constructed in accordance to one example of the present disclosure includes a fuel tank, a purge canister and a valve assembly. The valve assembly can be fluidly coupled between the fuel tank and the purge canister. The valve assembly can include a main valve and a safety check valve. The main valve can have a main valve first port fluidly coupled to an outlet of the fuel tank and a main valve second port fluidly connected to the purge canister. The safety check valve can be configured to move from an open position to a closed position upon a pressure drop at the fuel tank outlet exceeding a predetermined threshold. The safety check valve can have a safety check valve first port fluidly coupled to the outlet of the fuel tank and a safety check valve second port fluidly coupled to the purge canister.

Abstract: An evaporative emissions control system includes a first vent valve configured to selectively open and close a first vent, a second vent valve configured to selectively open and close a second vent, a fuel level sensor configured to sense a fuel level in the fuel tank, a pressure sensor configured to sense a pressure in the fuel tank, an accelerometer configured to measure an acceleration of the vehicle, and a controller configured to regulate operation of the first and second vent valves to provide pressure relief for the fuel tank. The controller is programmed to determine if a refueling event is occurring based one signals indicating the fuel level is increasing, the pressure in the fuel tank is increasing, and the vehicle is not moving, and open at least one of the first and second vent valves based on determining the refueling event is occurring.

Abstract: A valve assembly includes a valve body with an interior cavity and one or more supply ports, a control port, and an exhaust port each fluidly connected to the interior cavity. An armature assembly is movable within the interior cavity from a first position to a second position in response to the coil being energized. In some configurations, a regulator body, which is connected to the valve body, has an exhaust passage fluidly connected to the exhaust port. A regulator valve in the regulator body prevents fluid flow out of the exhaust passage when fluid pressure on the regulator valve is at or below a pilot pressure. The regulator valve permits fluid flow out of the exhaust passage when fluid pressure on the regulator valve is greater than the pilot pressure. The valve body is configured to provide fluid from the supply port/ports to the control port.

Abstract: A manifold assembly configured for distributing fluid to an externally connected hydraulic component which may be capable of leakage detection through measurement of pressure decay. The manifold assembly may include a manifold body and a valve assembly. The manifold body may have a plurality of fluid passages. Fluid flow may be controlled by the valve assembly attached to the manifold body. The valve assembly may include two valve devices capable of controlling fluid flow. When fluid is blocked by the valve devices, any fluid leakage may be unloaded from the valve assembly through an orifice located between the two valve devices. The orifice may provide a pressure unloading feature which may increase accuracy of measuring the pressure decay during leakage detection.

Abstract: A method for monitoring operation of a solenoid valve having an armature and a poppet coupled to the armature includes the steps of energizing a coil in the valve to generate a current signature reflecting current vs. time, detecting a first inflection point in the current signature, wherein the first inflection point occurs when the armature starts to move from one of the open and closed positions toward the other of the open and closed positions, and detecting a second inflection point in the current signature. The second inflection point occurs when the armature moves completely to the other of the open and closed positions. In one embodiment, the first inflection point indicates when the valve begins to open, making it possible to accurately determine the elapsed opening time of the valve.

Abstract: A method of controlling a pulse width modulated fuel injector includes pumping fuel to the fuel injector with a variable-pressure fuel supply and commanding a mass flow. The method measures an actual fuel pressure of the variable-pressure fuel supply and adapts a duty cycle command for the fuel injector based upon an open loop calculation that utilizes both the commanded mass flow and the measured actual fuel pressure. The method may be characterized by an absence of controlling the actual fuel pressure of the variable-pressure fuel supply and may be further characterized by an absence of control by an electro-hydraulic regulator. The open loop calculation may use at least two coefficients.

Abstract: A method for detecting a leak in a dosing manifold system having a manifold body, first valve assembly, and a device capable of preventing fluid flow. The method including the steps of transporting a fluid into a control fluid circuit, trapping the fluid in the circuit with the first valve assembly and the device capable of preventing fluid flow, blocking the fluid outside the control fluid circuit, relieving pressure outside of the circuit via the first valve assembly, measuring pressure inside the circuit, and comparing the pressures with selected baseline values.

Abstract: A manifold assembly configured for distributing fluid to an externally connected hydraulic component which may be capable of leakage detection through measurement of pressure decay. The manifold assembly may include a manifold body and a valve assembly. The manifold body may have a plurality of fluid passages. Fluid flow may be controlled by the valve assembly attached to the manifold body. The valve assembly may include two valve devices capable of controlling fluid flow. When fluid is blocked by the valve devices, any fluid leakage may be unloaded from the valve assembly through an orifice located between the two valve devices. The orifice may provide a pressure unloading feature which may increase accuracy of measuring the pressure decay during leakage detection.

Abstract: A solenoid-actuated valve assembly includes a valve body defining a supply port in communication with a fluid supply, an upper or first chamber, a lower or second chamber in communication with the first chamber, a first valve seat, and a control port in fluid communication with a downstream hydraulic component. An armature seals against the first valve seat when a solenoid is in a closed position, and a spring otherwise biases the armature against the upper valve seat. A lower valve device is positioned in the second chamber, and has a moveable portion that selectively admits fluid into the second chamber in the open position. The valve body defines at least one orifice between the supply port and the first valve seat, the orifice providing a pressure unloading function for venting fluid that leaks past the valve device when the solenoid is not being actuated.

Abstract: The present invention is an integrated two-stage low-leak control valve which is used to control pressure or flow in a hydraulic system such as an automatic transmission valve body. The control valve formed of a single assembly. A valve portion and a solenoid portion are located in the single assembly. The solenoid portion is operably connected to the valve portion with two variable orifices contained in the single assembly. A first variable orifice controls the flow of a fluid medium from a supply port in the integrated control valve to a pressure control region of the integrated control valve, and a second variable orifice controls the flow of the fluid medium to an exhaust port in the integrated control valve.

Abstract: A solenoid operated pressure balanced spool type pressure control valve for controlling flow between a pressure source inlet and a signal pressure outlet and between the signal pressure outlet and an exhaust or sump return port. the spool has metering orifices formed in pressure equalization flow passages through the spool. The metering orifices preferably comprise three orifices having a diameter in the range of about 0.50-0.76 mm for providing viscous dampening of the flow through the spool and dampers oscillations of the spool and armature due to hydraulic and/or electrical transients.