Electronic ignition system with modulated cylinder-to-cylinder t

Details Electronic ignition system with modulated cylinder-to-cylinder t Electronic ignition system with modulated cylinder-to-cylinder t

1994-07-08

1997-05-06

Nelli, Raymond A.

Internal-combustion engines

Spark ignition timing control

Electronic control

F02P 500

Patent

active

056261179

ABSTRACT:
An electronic ignition timing control system including a mechanism for retarding the ignition timing for all or a predetermined subset of the cylinders in a multi-cylinder internal combustion engine during cold starts. Spark timing is reduced for a balanced subset of the cylinders for a short time after the engine is started in order to transfer additional heat to the exhaust system to more quickly raise the temperature of the catalyst and thereby reduce undesired emissions.

REFERENCES:
patent: 3813877 (1974-06-01), Hunt
patent: 3927523 (1975-12-01), Shiyoyama et al.
patent: 3964258 (1976-06-01), Romano et al.
patent: 4007590 (1977-02-01), Nagai et al.
patent: 4103486 (1978-08-01), Hata et al.
patent: 4111010 (1978-09-01), Minami
patent: 5184463 (1993-02-01), Becker et al.
patent: 5271367 (1993-12-01), Abe

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