Ignition control system for an internal combustion engine

Details Ignition control system for an internal combustion engine Ignition control system for an internal combustion engine

1989-09-26

1990-10-16

Wolfe, Willis R.

Internal-combustion engines

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

123479, 123414, F02P 514, F02P 5145

Patent

active

049627384

ABSTRACT:
An ignition control system for an internal combustion engine adapted to control ignition timing based on the internal pressure in an engine cylinder. In one embodiment, ignition timing is determined based mainly on the rotational position (i.e., crank angle) of a crankshaft sensed by a crank angle sensor at the time or normal operation of the crank angle sensor, whereas it is determined based on the internal pressure in the engine cylinder sensed by a cylinder internal pressure sensor at the time of failure in the crank angle sensor. In the latter case, the output of cylinder internal pressure sensor is differentiated and then compared with a reference signal of a predetermined level so that ignition is effected when the differentiator output crosses the reference signal level for the second time per engine cycle. In another embodiment, a target ignition timing is determined based on the internal pressure in the engine cylinder and the intake pressure in an intake pipe. When the internal pressure in the engine cylinder as sensed by a cylinder internal pressure sensor becomes equal to the target ignition timing, ignition is effected.

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