Fuel control system
AssigneeWalbro Corporation
InventorsMartin N. Andersson, Dale P. Kus
Life of this patent
Estimating the term…
Abstract
In at least some implementations, a charge forming device includes a body having a main bore, a fuel metering assembly including a diaphragm that defines at least part of a fuel chamber from which fuel is provided to the main bore and a reference chamber separate from the fuel chamber, a passage communicated with a subatmospheric pressure source and with the reference chamber, and an electrically actuated valve having an open position and a closed position, and wherein the valve at least substantially prevents communication of the pressure source with the reference chamber when the valve is in the closed position and permits communication of the pressure source with the reference chamber when the valve is in the open position to vary the rate of fuel flow from the fuel chamber.
Claims16
A charge forming device, comprising:
- a body having a main bore;
- a fuel metering assembly including a diaphragm that defines at least part of a fuel chamber from which fuel is provided to the main bore and a reference chamber separate from the fuel chamber;
- a passage communicated with a subatmospheric pressure source and with the reference chamber, wherein the pressure source is the main bore;
- and
- an electrically actuated valve having an open position and a closed position, and wherein the valve at least substantially prevents communication of the pressure source with the reference chamber when the valve is in the closed position and permits communication of the pressure source with the reference chamber when the valve is in the open position to vary the rate of fuel flow from the fuel chamber wherein the passage extends at least partially through the body and through a portion of the diaphragm.
A charge forming device, comprising:
- a body having a main bore;
- a throttle valve rotatably carried by the body and having at least a portion received in the main bore;
- a diaphragm with a first side that defines at least part of a fuel chamber from which fuel is provided to the main bore and a second side that defines at least part of a reference chamber that is separate from the fuel chamber;
- a passage communicated with a subatmospheric pressure source and with the reference chamber;
- and
- an electrically actuated valve having a valve head that is moveable between an open position and a closed position relative to a valve seat, the valve seat is located between the pressure source and the reference chamber and the valve at least substantially prevents communication of the pressure source with the reference chamber when the valve head is in the closed position, and the valve permits communication of the pressure source with the reference chamber when the valve is in the open position to vary the rate of fuel flow from the fuel chamber wherein the pressure source is the main bore and wherein the passage extends at least partially through the body and through a portion of the diaphragm.
An engine system, comprising:
- an engine including a spark plug;
- a charge forming device, including:
- a body having a main bore communicated with the engine;
- a fuel metering assembly including a diaphragm that defines at least part of a fuel chamber from which fuel is provided to the main bore and a reference chamber separate from the fuel chamber;
- a passage communicated with a subatmospheric pressure source and with the reference chamber;
- and
- an electrically actuated valve that is moveable between an open position and a closed position to at least substantially prevent communication of one or more subatmospheric pressure signals from the pressure source with the reference chamber when the valve is in the closed position and to permit communication of one or more subatmospheric pressure signals from the pressure source with the reference chamber when the valve is in the open position to vary the rate of fuel flow from the fuel chamber wherein the pressure source is the main bore and wherein the passage extends at least partially through a portion of the diaphragm;
- and
- an ignition circuit including one or more coils in which electrical energy is induced during operation of the engine, the ignition circuit being coupled to the spark plug to provide electrical energy to the spark plug, and the ignition circuit being coupled to the electrically actuated valve to provide electrical power to the electrically actuated valve.
Dependencies are inferred from the claim text.