F - Mech Eng,Light,Heat,Weapons – 02 – D
Patent
F - Mech Eng,Light,Heat,Weapons
02
D
341/38.13
F02D 41/14 (2006.01)
Patent
CA 1109140
CLOSED LOOP FUEL CONTROL SYSTEM FOR AN INTERNAL COMBUSTION ENGINE HAVING AIR/FUEL RATIO ENRICHMENT DURING PERIOD OF ENGINE WARMUP Abstract of the Disclosure: 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 direc- tion tending to maintain the desired exhaust gas condition. The output of the integral controller is limited to predeter- mined 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.
309254
Carlson Clifford R.
Chiesa Alan F.
General Motors Corporation
Gowling Lafleur Henderson Llp
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