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Simultaneously firing two cylinders of an even firing camless engine

United States Patent

March 11, 2014
View the Complete Patent at the US Patent & Trademark Office
A valve control system includes an engine speed control module that determines an engine speed and a desired engine stop position. A piston position module determines a desired stopping position of a first piston based on the desired engine stop position. A valve control module receives the desired stopping position, commands a set of valves to close at the desired stopping position if the engine speed is less than a predetermined shutdown threshold, and commands the set of valves to reduce the engine speed if the engine speed is greater than the predetermined shutdown threshold.
Brennan; Daniel G. (Brighton, MI)
GM Global Technology Operations LLC (
13/ 238,388
September 21, 2011
STATEMENT OF GOVERNMENT RIGHTS This invention was produced pursuant to U.S. Government Contract No. DE-FC26-05NT42415 with the Department of Energy (DoE). The U.S. Government has certain rights in this invention.