Closed loop air/fuel ratio control system with oxygen sensor sig

Details Closed loop air/fuel ratio control system with oxygen sensor sig Closed loop air/fuel ratio control system with oxygen sensor sig

1980-09-26

1982-07-06

Lall, P. S.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, F02M 700

Patent

active

043377459

ABSTRACT:
The signal provided by an oxygen sensor monitoring the exhaust discharge from an internal combustion engine having a closed loop air/fuel ratio controller is compensated so that the controller is insensitive to the difference between the rich-to-lean and lean-to-rich time responses of the sensor signal. The compensated sensor signal has fixed symmetrical voltage change slopes which are set at a value smaller than the smallest of the two slopes of the sensor signal when the compensated sensor signal being clamped at rich and lean voltages that are respectively less than and greater than the sensor rich and lean voltages.

REFERENCES:
patent: 4191151 (1980-03-01), Wanamaker
patent: 4224913 (1980-09-01), Barnard
patent: 4228775 (1980-10-01), Schweikert
patent: 4258563 (1981-03-01), Yasuda et al.
patent: 4274381 (1981-06-01), Abo

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