Method for reducing power consumption and emissions for an internal combustion engine having a variable event valvetrain
AssigneeFord Global Technologies, LLC
InventorsIlya Kolmanovsky, Donald Lewis
Life of this patent
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Abstract
A method for controlling stopping and starting of an engine having a variable event valvetrain is described. According to the method engine valves may be used to reduce engine evaporative emissions as well as engine starting emissions.
Claims17
A method for controlling at least a variably activated valve operable in a cylinder of an internal combustion engine operating in a vehicle, the method comprising:
- after an engine stop and before a request to start said internal combustion engine, moving at least a variably actuated valve to a first position in response to an operating condition of said vehicle;
- and
- moving said at least a variably actuated valve to a second position after said request to start said internal combustion engine.
A system for controlling at least a variably activated valve operable in a cylinder of an internal combustion engine operating in a vehicle, the system comprising:
- a valve actuator having permanent magnets;
- and
- a controller that reduces current to said valve actuator after an engine stop such that said valve actuator maintains a position for at least a portion of an engine stop period.
A method for controlling at least a variably activated valve operable in a cylinder of an internal combustion engine, the method comprising:
- stopping said engine after a request to stop or after said engine has stalled;
- holding at least a variably actuated valve in a first position after said request or said stall;
- moving said at least a variably actuated valve from said first position to a second position in response to an operating condition of a vehicle;
- and
- moving said at least a variably actuated valve to a third position after said a request to start said internal combustion engine.
Dependencies are inferred from the claim text.