Combined warm-up enrichment, engine roughness and exhaust gas se

Details Combined warm-up enrichment, engine roughness and exhaust gas se Combined warm-up enrichment, engine roughness and exhaust gas se

1979-10-03

1982-05-04

Myhre, Charles J.

Internal-combustion engines

Charge forming device

Including means responsive to instantaneous change in engine...

123440, 123489, 123491, F02D 500

Patent

active

043276890

ABSTRACT:
In an electronic fuel injection system for an internal combustion engine an oxygen sensor tests the exhaust gas for oxygen content and provides a feedback signal for fuel/air mixture control. During cold start and engine warm-up the oxygen sensor is inoperative and mixture is controlled as a function of engine coolant temperature. During this phase the mixture may be excessively lean causing rough engine running. Means responsive to cylinder misfirings temporarily enrich the mixture to eliminate engine roughness.

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patent: 3771502 (1973-11-01), Reddy
patent: 3938479 (1976-02-01), Oberstadt
patent: 3971354 (1976-07-01), Luchaco et al.
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patent: 4092955 (1978-06-01), Reddy
patent: 4109615 (1978-08-01), Asano
patent: 4136645 (1979-01-01), Ito et al.
patent: 4271798 (1981-06-01), Seitz et al.

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