Engine knock control supervisory system

Details Engine knock control supervisory system Engine knock control supervisory system

1982-06-29

1984-07-31

Lall, Parshotam S.

Internal-combustion engines

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

123435, 73 35, F02B 514

Patent

active

044623623

ABSTRACT:
A knocking sensor provides output signals which are compared in a comparator (14) with a reference (16), knocking signals (FIG. 3: U17) exceeding the reference (U16); during predetermined cyclically recurring test intervals (FIG. 2: 19), for example after each 1000 ignition events, a test signal is generated at a terminal (15) of a microprocessor (12) and applied to the comparator (14) to lower the reference level (16), so that noise signals will cause a simulated, or pseudo knocking signal to be generated. Simultaneous occurrence of the simulated, or pseudo knocking signal and test signals indicates appropriate function of the knocking system; failure of the pseudo knocking signal to occur with the lowered reference generates control output from the microprocessor, for example by retarding ignition of an ignition system (13).

REFERENCES:
patent: 4002155 (1977-01-01), Harned et al.
patent: 4133475 (1979-01-01), Harned et al.
patent: 4290398 (1981-09-01), Hattori et al.
patent: 4300503 (1981-11-01), Deleris et al.
patent: 4345558 (1982-08-01), Yamaguchi et al.
patent: 4346586 (1982-08-01), Furrey
patent: 4378771 (1983-04-01), Sawada et al.
Automobiltechnisches Handbuch, ed. Bussien, Berlin, 1965, pp. 52-55, 972-975, 984-1003.

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