Patent Number: 6,308,671

Title: Method of increasing torque and/or reducing emissions by varying the timing of intake and/or exhaust valves

Abstract: A method of improving the operating characteristics of an internal combustion engine equipped with electronic throttle control employs variable cam timing to vary the phasing of the intake valves and/or exhaust valves so as to achieve lower feed gas emissions and improved fuel economy while delivering as closely as possible the desired torque. The method can be implemented using a fuel-lead strategy or an air-lead strategy. Whenever a change is requested in the amount of torque, the method responds by adjusting the amount of fuel flow, the spark timing, the position of the throttle and/or the positions of the intake valves and/or the exhaust valves so as to deliver the desired torque. The method adjusts those operating parameters in a way that improves the ability of the engine to deliver the desired torque, produce less feed gas emissions, idle more stably, and consume less fuel.

Inventors: Reed; Dennis C. (Plymouth, MI), Muller; Martin (Ann Arbor, MI), Himes; Edward George (Novi, MI), Schreurs; Bart Hubert (Athus, BE), Yoo; Joon-Ho (Ann Arbor, MI)

Assignee: Delphi Technologies, Inc.

International Classification: F02D 41/00 (20060101); F02D 41/34 (20060101); F01L 1/34 (20060101); F02D 13/02 (20060101); F01L 001/34 (); F02D 009/10 ()

Expiration Date: 10/30/2018