G - Physics – 05 – D
Patent
G - Physics
05
D
341/38.13
G05D 7/06 (2006.01) F02D 41/14 (2006.01) F02D 41/24 (2006.01) G05D 11/13 (2006.01)
Patent
CA 1100603
C-2836 D-1,457 DIGITAL CLOSED LOOP FUEL CONTROL SYSTEM Abstract of the Disclosure: A digital closed loop fuel control system for an internal combustion engine having a zirconia sensor which pro- vides a signal changing abruptly between first and second values as the air/fuel ratio varies through a stoichiometric ratio. The output of the zirconia sensor is sampled at constant fre- quency sampling intervals and an up/down counter is set in one of its counting modes as a function of whether the air/fuel ratio is less than or greater than the stoichiometric ratio. During each sampling interval, a first number of clock pulses from a clock pulse generator are coupled to the up/down counter when the air/fuel ratio is greater than a stoichiometric ratio and a second number of the clock pulses are coupled to the up/down counter when the air/fuel ratio is less than the stoi- chiometric ratio. The air/fuel ratio of the fuel mixture sup- plied to the internal combustion engine is varied in accord with the net count in the up/down counter so that the average air/ fuel ratio is offset from the stoichiometric air/fuel ratio by a value determined by the difference in the first and second numbers of clock pulses supplied to the up/down counter.
300698
Bowler Lauren L.
Rice John O.
General Motors Corporation
Gowling Lafleur Henderson Llp
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