Load detection method

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F - Mech Eng,Light,Heat,Weapons

02

P

F02P 17/00 (2006.01) F02P 3/02 (2006.01) F02P 5/152 (2006.01) F02P 13/00 (2006.01) F02P 15/08 (2006.01) F02P 15/12 (2006.01) F02P 17/12 (2006.01) H01F 38/12 (2006.01)

Patent

CA 2134818

A method for determining engine load of a spark ignition internal combustion engine. The method includes the steps of charging an ignition transformer to a maximum ignition charge and initiating an ignition discharge between electrodes of the spark plug. The ignition transformer is then charged to a predetermined diagnostic charge which is less than said maximum ignition charge. The diagnostic charge is discharged at a time of the combustion cycle where pressure in the combustion cylinder is dependent on engine load. The duration diagnostic discharge is then monitored and subsequently correlated to engine load. In this manner, the spark plug is used as a feedback element in determining engine load.

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