Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1977-10-03
1979-09-18
Myhre, Charles J.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
60276, 60285, F02D 502
Patent
active
041679245
ABSTRACT:
A closed loop fuel control system is described for a vehicle internal combustion engine which includes an exhaust gas sensor providing a signal having a value determined by the oxidizing/reducing conditions of the exhaust gases. An integral controller is responsive to the output of the exhaust gas sensor and provides a control signal varying in a first direction for sensed oxidizing/reducing conditions greater than a desired condition and varying in an opposite direction for sensed oxidizing/reducing conditions less than the desired condition. A control circuit is responsive to the output of the integral controller to adjust the vehicle engine air/fuel supply device to vary the value of the air/fuel ratio of the mixture supplied to the engine in a direction tending to maintain the desired exhaust gas condition. The output of the integral controller is limited to predetermined values so as to limit the air/fuel ratio control authority of the closed loop circuit. A circuit is described which varies the limit of the value of the output of the integral controller in a mixture leaning direction as a function of engine operating parameters related to cold engine operation so as to prevent severe excursions of the air/fuel ratio in the lean direction resulting from certain vehicle operator initiated inputs to the fuel supply device during cold engine operation.
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Carlson Clifford R.
Chiesa Alan F.
Conkey Howard N.
General Motors Corporation
Myhre Charles J.
Nelli R. A.
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