Abstract:
A system and method for determining valve degradation is presented. According to the method, valve timing can be adjusted in a number of ways to improve the possibility of detecting a degraded valve.
Abstract:
A system and method to control engine valve timing to improve the start of an internal combustion engine. Electromechanical valves are controlled in a manner to reduce hydrocarbon emissions during the start of an internal combustion engine.
Abstract:
A system and method to control spark in a cylinder of a multi-cylinder engine. Spark can be controlled in a cylinder based on operating conditions of a selectively operable valve.
Abstract:
A system and method to control spark in a cylinder of a multi-cylinder engine. Spark can be controlled in a cylinder based on operating conditions of a selectively operable valve.
Abstract:
A system and method to control engine valve timing to improve the start of an internal combustion engine. Electromechanical valves are controlled in a manner to reduce hydrocarbon emissions during the start of an internal combustion engine.
Abstract:
A method to compute, store, and inject adaptive valve timing corrections in a camless valvetrain architecture where a measurable (based on the resolution of the measuring methodology) error exists between the requested and delivered valve timing. This method is based on a measurement of the delivered valve timing, such as from a direct position sensor, (hall effect, LVDT, optical, etc.) or inferred position sensing based on valve actuator current (electronic actuation) or pressure (hydraulic actuation) feedback. This measured delivered valve timing information is used to compute offsets which, when applied to the desired timing, provide more accurate correlation between the delivered timing and the desired timing.
Abstract:
A method for controlling an engine during a start is presented. In one example, the method includes direct starting an engine with a port fuel injector. The method can improve engine starting during some conditions.
Abstract:
A system and method for controlling electromechanical valves operating in an engine is presented. According to the method, valve timing can be adjusted in a number of ways. The method can also compensate for changes in the natural response of the valve apparatus.
Abstract:
A method for controlling engine torque during disruption of a primary communication link between an engine control unit and a valve control unit in an engine is provided. The method includes determining disruption of the primary communication link between the engine control unit and the valve control unit, operating a preset valve timing schedule upon determination of disruption of the communication link between the engine control unit and the valve control unit; and sending a status message from the valve control unit to the engine control unit regarding the operational status of the valve control unit.
Abstract:
A system and method to control spark in a cylinder of a multi-cylinder engine. Spark can be controlled in a cylinder while reducing the possibility of producing a spark at a spark plug coupled to an ignition coil.