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US 6,631,699 B2Granted
Air fuel module
AssigneeSiemens VDO Automative Corporation
InventorsMichael Lutz, Manzurul Haque, Piero Caporuscio, Phillip G. Iott, Larry Hiltunen, Herbert Lacher, Nikolaus Kerner
Life of this patent
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Abstract
A method for controlling valve actuation comprises the steps of communicating at least one dithering signal to preload the valve. An event signal is then communicated. The dithering signal is altered based on the cycle time for the valve. The preferred application is for camless engine valve control.
Claims17
A method of controlling a valve system including plural cyclically operated valves comprising the steps of:
- communicating at least one dithering signal to actuate one of said valves, the at least one dithering signal activating the at least one valve and lasting a portion of an event time period less than the event time period;
- communicating an event signal to the at least one valve, the event signal lasting the event time period and activating the at least one valve;
- sensing a cyclic operation timing for said at least one valve;
- and
- altering the at least one dithering signal based on the cyclic operation timing.
2 more elements
A method of controlling a camless engine comprising the steps of:
- communicating at least one dithering signal to an actuator wherein the actuator actuates a hydraulic combustion chamber valve, the at least one dithering signal activating the actuator and lasting a portion of an event time period less than the event time period;
- communicating an event signal to the actuator, the event signal lasting the event time period and activating the actuator;
- sensing a speed of the engine;
- and
- altering the at least one dithering signal based on the speed of the camless engine.
2 more elements
A camless engine comprising:
- a plurality of valves, operable to direct fluid into a combustion chamber of said engine;
- a sensor for detecting an engines speed;
- a control for directing an actuation signal to each of said plurality of valves in a cyclic fashion;
- and
- said control being programmed to determine said engine speed and provide both a dithering signal and an event signal, said dithering signal being operable to begin to preload said valve prior to the submission of said event signal, and said dithering signal being decreased as said speed of said engine increases.
2 more elements
Dependencies are inferred from the claim text.