Internal-combustion engines – Combustion chamber means combined with air-fuel mixture...
Patent
1990-03-07
1991-10-08
Dolinar, Andrew M.
Internal-combustion engines
Combustion chamber means combined with air-fuel mixture...
36443108, F02P 515
Patent
active
050544489
ABSTRACT:
An improved knocking suppression apparatus for an internal combustion engine is able to determine whether there is knocking in the engine through a microcomputer, reduce the load on the electric circuits employed and simplify the arrangement thereof. A knock interface circuit including a peak holding circuit and an averaging circuit is connected to receive the output signal of a knock sensor for generating a peak-hold signal (V.sub.P) representative of a peak in the knock sensor output signal and for generating an average signasl (V.sub.A) representative of an average of the knock sensor output signal. A microcomputer, based on the average signal (V.sub.A), sets a threshold level (V.sub.TH) and makes a comparison between the peak-hold signal (V.sub.P) and the threshold level (V.sub.TH) to determine when knocking occurs. An ignition timing controller retards the ignition timing as the number of revolutions per minute of the engine increases. The ignition timing controller includes a retard angle modifying means for modifying the retard angle (.theta..sub.R) based on the output signal (V.sub.K) of the knocking determining means (in the microcomputer) and retards the ignition timing based on the thus modified retard angle (.theta..sub.R ') so as to suppress knocking. Preferably, a failure determining means determines whether there is a failure in the knock sensor, and the retard angle modifying means stops the retard angle modification when the failure determining means detects such a failure.
REFERENCES:
patent: 4501137 (1985-02-01), Aoki et al.
patent: 4633835 (1987-01-01), Akasu
patent: 4699106 (1987-10-01), Haraguchi et al.
patent: 4766545 (1988-08-01), Nagai
Iwata Toshio
Matsuoka Atsuko
Dolinar Andrew M.
Mitsubishi Denki & Kabushiki Kaisha
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