Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1980-03-26
1981-09-01
Cox, Ronald B.
Internal-combustion engines
Charge forming device
Fuel injection system
123416, F02P 504
Patent
active
042865603
ABSTRACT:
An apparatus for controlling an ignition timing of an internal combustion engine for each ignition cycle. The apparatus fetches digital signals representing an intake pipe negative pressure and the number of revolutions of the internal combustion engine, and a digital signal representing a fuel injection time, and computes a basic timing of ignition spark by using the intake pipe negative pressure and the number of revolutions. When the intake pipe negative pressure and the number of revolutions, both being sensed currently, have ratios of changes falling within given values, compared with those sensed precedingly, correction values read out from a memory device on the basis of the intake pipe negative pressure and the number of revolutions are corrected so as to reduce the fuel injection time in accordance with the result of a comparison of the fuel injection time of the fuel injection currently performed with that of the fuel injection precedingly performed. An ignition timing is determined by correcting the basic ignition timing depending on the corrected correction value of the ignition timing. The corrected correction value is loaded into the memory device in place of the correction value before correction. When the intake pipe negative pressure and the number of revolutions, both being sensed currently, changes with ratio which falls out of fixed values, compared with those sensed precedingly, the basic ignition timing is corrected by the correction value of ignition timing read out on the basis of the intake pipe negative pressure and the number of revolutions, without correcting by the fuel injection time, thereby to determine an ignition timing. An ignition signal is applied to an internal combustion engine igniting device in accordance with the ignition timing determined.
REFERENCES:
patent: 3969614 (1976-07-01), Moyer
patent: 4047507 (1977-09-01), Noguchi
patent: 4130095 (1980-03-01), Bowler
patent: 4131097 (1978-12-01), Sawada
patent: 4191146 (1980-04-01), Taplin
patent: 4201161 (1980-05-01), Sasayama
patent: 4236214 (1980-11-01), Sasayama
Kobayashi Akio
Kondo Toshio
Sagisaka Yasuo
Cox Ronald B.
Nippondenso Co. Ltd.
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