METHODS OF CONTROLLING A CAMLESS ENGINE TO PREVENT INTERFERENCE BETWEEN VALVES AND PISTONS

WIPO Patent Application WO2004094792

A3

Methods of controlling a camless engine to prevent interference between engine valves and engine valves and pistons. The methods utilize one or more safe trajectories for the valves versus engine crankshaft angle. In normal operation, an engine valve control system monitors crankshaft angle and controls the engine valve so as to stay on the safe side trajectory. In the event the actual valve motion deviates excessively from the intended trajectory so as to reach or cross the safe trajectory, preventive action is taken, typically to command the engine valve to close. Safe trajectories may be stored in lookup tables, in equation form or both. In some cases a single safe trajectory for a valve may be sufficient, through in other cases, safe trajectories as a function of some engine operating conditions and environmental conditions, and in some cases may include crankshaft acceleration. Various embodiments are disclosed.

BABBITT GUY ROBERT (US)
BALTON CHRISTOPHER STEVENS (US)

PCT/US2004/012151

February 03, 2005

April 19, 2004

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STURMAN IND INC (US)
BABBITT GUY ROBERT (US)
BALTON CHRISTOPHER STEVENS (US)

F01L9/10; F01L9/16; F01L9/20; F02D13/02; F02D41/22; F01L9/24; F02D13/04; (IPC1-7): F01L9/04; F02D13/02; F02D41/22

WO2001040640A1

2001-06-07

US5765514A	1998-06-16
US6092495A	2000-07-25
DE10112995A1	2002-09-19
US6230675B1	2001-05-15
EP1258601A2	2002-11-20

PATENT ABSTRACTS OF JAPAN vol. 0110, no. 78 (M - 570) 10 March 1987 (1987-03-10)

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