Spark ignition timing control system for internal combustion eng

Details Spark ignition timing control system for internal combustion eng Spark ignition timing control system for internal combustion eng

1990-05-16

1991-05-14

Nelli, Raymond A.

Internal-combustion engines

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

123575, 123602, 123494, 123479, F02P 514, F02M 5100, F02B 1300

Patent

active

050146700

ABSTRACT:
In order to accomplish aforementioned and other objects, a spark ignition timing control system, according to the present invention employs means for monitoring maximum pressure point in an engine revolution cycle, where the internal pressure in an engine cylinder becomes maximum for deriving period required for fully propagating combustion in the engine cylinder on the basis of angular difference between spark ignition initiating point and the maximum, pressure point. The means predicts concentration of one of fuels in a mixture fuel on the basis of the derived propagating period. The system compares the predicted concentration with an actually measured concentration of the relevant fuel by means of a sensor to detect failure of the sensor. When failure of the sensor is detected, fail-safe operation is performed by setting the concentration data at a predetermined fixed value.

REFERENCES:
patent: 4546732 (1985-10-01), Mae et al.
patent: 4694811 (1987-09-01), Benncet
patent: 4884530 (1989-12-01), Bockhaus et al.
patent: 4905655 (1990-03-01), Maekawa
patent: 4909225 (1990-03-01), Gonze et al.
patent: 4945881 (1990-08-01), Gonze et al.
patent: 4951630 (1990-08-01), Iwata

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