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Internal combustion engine cylinder-to-cylinder balancing with balanced air-fuel ratios

United States Patent

January 3, 2006
View the Complete Patent at the US Patent & Trademark Office
A method of balancing combustion among cylinders of an internal combustion engine. For each cylinder, a normalized peak firing pressure is calculated as the ratio of its peak firing pressure to its combustion pressure. Each cylinder's normalized peak firing pressure is compared to a target value for normalized peak firing pressure. The fuel flow is adjusted to any cylinder whose normalized peak firing pressure is not substantially equal to the target value.
Harris; Ralph E. (San Antonio, TX), Bourn; Gary D. (San Antonio, TX), Smalley; Anthony J. (San Antonio, TX)
Southwest Research Institute (San Antonio, TX)
10/ 663,630
September 16, 2003
GOVERNMENT LICENSE RIGHTS The U.S. Government has a paid-up license in this invention and the right in certain circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Contract No. DE-FC26-02NT41646 for the U.S. Department of Energy.