Siemens Vdo Automotive Corporation

Siemens Vdo Automative Corporation

Herbert Lacher

Larry Hiltunen

Piero Caporuscio

John C McCoy

Nikolaus Kerner

Manzurul Haque

Michael Lutz

Phillip G Iott

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.

Air fuel module

A control for a camless engine is provided with a plurality of modules each associated with an individual cylinder. The modules are programmed to operate their respective cylinders once on each of two revolutions of a crankshaft. Thus, the control modules must have an indication of the point in the rotational cycle of the crankcase, but also a signal of which of the two revolutions in the two-revolution cycle is ongoing for the crankshaft. The crankshaft preferably provides a uniform signal for each of the two revolutions. The uniform signal is modified by a signal modification method such that the signal sent to the modules is distinct for each of the two revolutions. In a preferred embodiment the signal is provided with a space which is indicative of a particular point in each revolution. A modifier is controlled by a switch which alternates between one of two positions, and which modifies the space in one of the two positions. In another embodiment at least a portion of the signal is inverted between the two revolutions. In yet another embodiment, the pulse width of at least a portion of the signal is changed between the two revolutions.

Camless engine with crankshaft position feedback

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Leiblfing, Germany

Herbert Lacher