Air-fuel ratio control system for internal combustion engines
An air-fuel ratio control system is described for internal combustion engines, comprising: an air-fuel ratio sensor mounted in an exhaust pipe of an internal combustion engine and adapted to produce an output indicative of the air-fuel ratio of a mixture supplied to the engine on the basis for the composition of exhaust gases in the exhaust pipe; heating means for heating the air-fuel ratio sensor; a temperature sensor for sensing the temperature of the internal combustion engine; an engine operation sensor adapted to sense whether the engine has been stopped; and control means for allowing, when the engine operation sensor has sensed that the internal combustion engine has been stopped while the engine temperature sensed by the temperature sensor is below a predetermined level, the heating means to operate for a predetermined time after the engine operation sensor has sensed that the internal combustion engine has been stopped.
- Assignee:
- Mitsubishi Denki Kabushiki Kaisha
- Patent Number(s):
- US 4753204
- OSTI ID:
- 7047635
- Resource Relation:
- Patent File Date: Filed date 28 Sep 1987
- Country of Publication:
- United States
- Language:
- English
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