Internal combustion engine with oxygen sensor heater control

Details Internal combustion engine with oxygen sensor heater control Internal combustion engine with oxygen sensor heater control

1980-10-02

1982-06-01

Lall, P. S.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, 204195S, F02B 300, F02M 700

Patent

active

043322255

ABSTRACT:
An internal combustion engine with a closed loop air/fuel ratio control utilizes a heated zirconia sensor, the sensor including a resistance heater element connected to receive electric current from the vehicle battery, the sensor having an internal parasitic capacitance and being characterized by a leakage current path between the heater element and the capacitance. The sensor output voltage is sampled by the closed loop control periodically and current is supplied to the heater element only during periods which end a predetermined time before each such sampling so that any charge on the capacitance may discharge before it affects the sampled voltage. Within each period, the current may be duty cycle modulated in response to vehicle battery voltage to maintain a constant average power to the heater element when heat is required.

REFERENCES:
patent: 3616274 (1971-10-01), Eddy
patent: 3738341 (1973-06-01), Loos
patent: 3915135 (1975-10-01), Kushida et al.
patent: 3946198 (1976-03-01), Foote
patent: 3948081 (1976-04-01), Wessel et al.
patent: 4129099 (1978-12-01), Howarth
patent: 4130095 (1978-12-01), Bowler et al.
patent: 4167163 (1979-09-01), Moder
patent: 4170967 (1979-10-01), Wessel et al.

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