Method for maintaining clean spark plugs in a variable displacem

Details Method for maintaining clean spark plugs in a variable displacem Method for maintaining clean spark plugs in a variable displacem

1995-11-20

1997-04-08

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel injection system

F02D 4300

Patent

active

056178298

ABSTRACT:
A method for maintaining clean spark plugs in a variable displacement engine in which at least one group of cylinders is disabled in response to the engine load being less than a predetermined value. A first timer determines the maximum period that the engine may be operated with the first group of cylinders being disabled. A second timer controls the period of time the previously deactivated cylinders need to be reactivated to clean the spark plugs, after being deactivated for the maximum period of time.

REFERENCES:
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patent: 4470390 (1984-09-01), Omori et al.
patent: 4550704 (1985-11-01), Barho et al.
patent: 4947810 (1990-08-01), Gillbrand et al.
patent: 4976228 (1990-12-01), Kawamura
patent: 5099816 (1992-03-01), Ohga et al.
patent: 5117792 (1992-06-01), Kanno
patent: 5377631 (1995-01-01), Schechter
Patent Abstracts of Japan, vol. 18, No. 389, [M1642], Jul. 21, 1994 & JP 6-108958 (Ishii, et al), Apr. 19, 1994.

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