Air-fuel ratio control device for an internal combustion engine
Patent
·
OSTI ID:6575652
Disclosed is an air-fuel control device for an internal combustion engine which includes: an O/sub 2/ sensor for detecting the oxygen concentration of exhaust gas; a control circuit having a comparator for comparing the output voltage from the O/sub 2/ sensor with a reference voltage (Vr), so that the air-fuel ratio of the mixture discriminated as rich or lean with respect to a stoichiometric air-fuel ratio, and; an installation for supplying fuel into an intake passage, so that when the air-fuel ratio of the mixture is leaner than the stoichiometric value the amount of fuel is increased and when the air-fuel ratio of the mixture is richer than the stoichiometric value the amount of fuel is decreased. This device further includes a sensor for detecting the accelerating operating conditions of the engine, and a mechanism for changing the reference voltage (Vr) to a value (Vr2) different from a predetermined value (Vr1) so that the air-fuel ratio of the mixture is changed so as to be richer only when the engine is in the accelerating operating conditions.
- Assignee:
- Toyota Jidosha Kogyo K K (Japan)
- Patent Number(s):
- US 4240389
- OSTI ID:
- 6575652
- Country of Publication:
- United States
- Language:
- English
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