Engine ignition timing by combustion pressure harmonic phase dif

Details Engine ignition timing by combustion pressure harmonic phase dif Engine ignition timing by combustion pressure harmonic phase dif

1986-11-17

1987-10-13

Dolinar, Andrew M.

Internal-combustion engines

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

F02P 5145

Patent

active

046991050

ABSTRACT:
An ignition timing control for an internal combustion engine subjects a combustion pressure signal to multiple switched capacitor bandpass filters with frequencies controlled in phase lock loop from engine speed to generate harmonic wave signals at frequencies which are constant multiples of the varying firing frequency. The phase difference between the peaks of two harmonics such as the second and fourth is used to control ignition timing to a phase difference of zero, in some cases with ignition pulses referenced to the detected peak of the first harmonic (fundamental) rather than a detected crankshaft position. The ratio of peak amplitudes between two harmonics such as the first and fourth is used to control dilution by EGR or variable valve lift to a predetermined ratio. The ratio of the peak amplitude of subharmonics to the fundamental may be used as a roughness or driveability sensor.

REFERENCES:
patent: 4061116 (1977-12-01), Saida et al.
patent: 4466408 (1984-08-01), Cheklich
patent: 4481925 (1984-11-01), Karau et al.

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