Crank angle detecting system for internal combustion engines

Details Crank angle detecting system for internal combustion engines Crank angle detecting system for internal combustion engines

1988-11-01

1990-01-09

Argenbright, Tony M.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

73115, 731173, F02P 515, G01M 1500

Patent

active

048920754

ABSTRACT:
A crank angle detecting system for an internal combustion engine is provided which comprises a pressure sensor, a crank angle sensor, and crank angle judging device. The pressure sensor is adaptable for sensing pressure within the cylinder and provides pressure signals to the crank angle judging device which are representative of cylinder pressure within the cylinder at three predetermined crank angles in a range defined in the vicinity of a crank angle at which maximum torque is generated. The crank angle judging device determines the crank angle at which the maximum pressure within the cylinder occurs according to a quadratic equation employing the sensed cylinder pressures. The crank angle judging device then judges whether the crank angle at which maximum pressure is presumed to occur is advanced or retarded relative to the best crank angle. The ignition timing is corrected so as to be advanced or retarded according to the resulting judgments.

REFERENCES:
patent: 4403505 (1983-09-01), Hattori et al.
patent: 4621603 (1986-11-01), Matekunas
patent: 4622939 (1986-11-01), Matekunas
patent: 4727842 (1988-03-01), Takahashi
patent: 4802454 (1989-02-01), Tanaka

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