Method of and apparatus for detecting maximum cylinder pressure

Details Method of and apparatus for detecting maximum cylinder pressure Method of and apparatus for detecting maximum cylinder pressure

1987-06-19

1988-05-17

Myracle, Jerry W.

Measuring and testing

Vehicle drive train

Rear end

731173, G01M 1500

Patent

active

047442433

ABSTRACT:
A method of and an apparatus for detecting maximum cylinder pressure angle in an internal combustion engine. A crankshaft angle sensor detects a piston reference position such as top dead center (TDC) and the maximum cylinder pressure angle is obtained by measuring the interval between the reference position and the position at which pressure in the cylinder becomes maximum. Non-firing of the engine is detected and the position at which the motoring pressure occurring during non-firing becomes maximum is deemed to be the actual top dead center. The actual top dead center is used for correcting the output of the crankshaft angle sensor, enabling accurate detection of the maximum pressure angle. As the output error of the crankshaft sensor is substantially linearly proportional to the engine speed, the output error can be approximated as its average value or as a value obtained by interpolation.

REFERENCES:
patent: 4601196 (1986-07-01), Frelund
patent: 4672843 (1987-06-01), Pozniak

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