Internal-combustion engines – Spark ignition timing control – Electronic control
Reexamination Certificate
2005-05-10
2005-05-10
Mohanty, Bibhu (Department: 3747)
Internal-combustion engines
Spark ignition timing control
Electronic control
Reexamination Certificate
active
06889655
ABSTRACT:
A device for controlling the ignition timing for internal combustion engines correctly detecting fault of a knocking sensor over the whole rotational range of the engine. The device for controlling the ignition timing takes out knocking signals and produces an ignition timing control signal relying upon the knocking signals, and comprises a knocking sensor1, a microcomputer2for producing a fault detection execution signal for executing the detection of fault of the knocking sensor and for applying a pulse voltage to the knocking sensor1relying upon the fault detection execution signal, comparison means5and6for comparing the charging voltage or discharging voltage of the knocking sensor1with two different threshold values, and logic means (NOR circuit)7for obtaining an OR of the outputs of the comparison means5and6. The microcomputer2finds the sum of pulse widths output by the logic means during the period of detecting the fault and judges the fault of the knocking sensor relying upon the sum that is found of the pulse widths.
REFERENCES:
patent: 4425891 (1984-01-01), Kashimura et al.
patent: 4508079 (1985-04-01), Komurasaki et al.
patent: 60-26173 (1985-09-01), None
patent: 6-92748 (1994-11-01), None
Abe Minoru
Demizu Akira
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