Digital closed loop fuel control system

Details Digital closed loop fuel control system Digital closed loop fuel control system

1977-07-25

1978-10-31

Myhre, Charles J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123117D, 123 32EB, 60285, F02B 3300

Patent

active

041228111

ABSTRACT:
A digital closed loop fuel control system for an internal combustion engine having a zirconia sensor which provides 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 frequency 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 stoichiometric ratio. The air/fuel ratio of the fuel mixture supplied 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.

REFERENCES:
patent: 3835819 (1974-09-01), Anderson, Jr.
patent: 3895611 (1975-06-01), Endo et al.
patent: 3906205 (1975-09-01), Yoshida et al.
patent: 3927304 (1975-12-01), Wenteun, Jr. et al.
patent: 4073270 (1978-02-01), Endo

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