Method and device for optimizing the air-fuel mixture burn rate of internal combustion engines during low speed, light and heavy load operating conditions

摘要

The present invention concerns a method and device for optimizing the air-fuel mixture burn rates of an internal combustion engine in accordance with detonation limited control parameters during low speed, light and heavy load operating conditions. In particular, the present invention is preferably used with an engine having variable valve events that provide for a low speed, small valve event, and for earlier than normal intake valve closing. The method and device herein including phasing control of the operation of the camshaft of the engine with the operation of the crankshaft of the engine. The invention herein also including sensing of engine load and detonation. The phasing is controlled by a servo motor in response to signals produced from the sensing of load demand and/or detonation. The servo motor causing retarding of the phasing of the camshaft to the crankshaft in response to signals indicating a light load demand on the engine, and advancing the operation of the camshaft to the crankshaft in response to signals indicating heavy load demand on the engine or detonation. The retarding causing an increase in the air-fuel mixture burn rate and the advancing causing a decrease in the air-fuel mixture burn rate.