Adaptive knock control with pulse duration discrimination contro

Details Adaptive knock control with pulse duration discrimination contro Adaptive knock control with pulse duration discrimination contro

1986-04-14

1987-03-24

Dolinar, Andrew M.

Internal-combustion engines

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

73 35, F02P 5145

Patent

active

046516980

ABSTRACT:
An adaptive knock control for a spark ignited, internal combustion engine is disclosed in which a signal representing sensed knock induced and other bursts of engine vibrations is demodulated to generate pulses corresponding to the envelopes of such knock induced and other burst of engine vibrations. Discrimination apparatus responsive to pulses duration compares each to a discrimination reference and selectively discriminates in favor of those having a longer duration characteristic of knock induced bursts. The discrimination apparatus is responsive to engine speed to vary the discrimination reference therewith in the direction of shorter time durations with increased engine speed and longer time durations with slower engine speed. If the discrimination apparatus is a low pass filter, its corner frequency is varied directly with engine speed. If the discrimination apparatus is an ignore timer, the ignore time is varied inversely with engine speed. The apparatus may include an add timer following the ignore timer, the add time of which is also varied inversely with engine speed.

REFERENCES:
patent: 4012942 (1977-03-01), Harned
patent: 4276861 (1981-07-01), Kearney et al.
patent: 4312214 (1982-01-01), Kramer et al.
patent: 4384473 (1983-05-01), Brandt
patent: 4387588 (1983-06-01), Kaji
patent: 4420968 (1983-12-01), Dudeck et al.
patent: 4429565 (1984-02-01), Utsumi et al.
patent: 4501137 (1985-02-01), Aoki et al.

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