Spark plug heater control system for internal combustion engine

Details Spark plug heater control system for internal combustion engine Spark plug heater control system for internal combustion engine

1992-11-10

1993-07-27

Nelli, Raymond A.

Internal-combustion engines

Igniters

Sparkers

1241796, F02D 4106, F02D 4300, F02P 100

Patent

active

052303098

ABSTRACT:
A system for controlling heater mounted on a spark plug which ignites the air-fuel mixture in the combustion chamber of an internal combustion chamber. The heater-on time is determined such that it decreases with increasing engine temperature and increasing alcohol concentration. Current supplied to the heater is also determined such that it increases with increasing alcohol concentration and decreases with increasing engine temperature. Therefore, droplets at the spark plug caused by high alcohol concentration fuel can be removed while eliminating carbon fouling. The engine startablity can thus been improved without shorting the service life of the spark plug. Moreover, fuel injection amount is reduced so as not another fuel be deposited on a droplet fuel which is still being present. The heater is furthermore kept off when a starter motor is turning to supply sufficient power to the motor.

REFERENCES:
patent: 1805040 (1931-05-01), Groves
patent: 2048481 (1936-07-01), Arnois
patent: 3868939 (1975-03-01), Friesca et al.
patent: 4205650 (1980-06-01), Szwarcbier
patent: 4387676 (1983-06-01), Coucriro
patent: 4433665 (1984-02-01), Abe et al.
patent: 4870932 (1989-10-01), Asmus
patent: 5044331 (1991-04-01), Swan et al.

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