Method and system for internal combustion engine oxygen sensor h

Details Method and system for internal combustion engine oxygen sensor h Method and system for internal combustion engine oxygen sensor h

1984-11-09

1985-12-31

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

123440, 123494, F02D 500, G01N 2726

Patent

active

045614024

ABSTRACT:
An internal combustion engine has an exhaust system and an oxygen sensor fitted to the exhaust system including a sensor element and an electrically powered heater for heating it. The power supplied to the heater is controlled by determining a target value for it according to operational parameters of the engine, and by controlling the mean power in a time interval as follows: the voltage applied to the heater and the current flowing through it are detected, an intermittent voltage is supplied to the heater, and the duty ratio of the intermittent voltage is controlled so that the product of the heater voltage and the heater current is substantially equal to the target power, with the detection of the voltage supplied to the heater synchronized with the energization of the heater. A system is also described for implementing this method.

REFERENCES:
patent: 4140085 (1979-02-01), Rabus et al.
patent: 4214563 (1980-07-01), Hosaka
patent: 4332225 (1982-06-01), Cox et al.
patent: 4354468 (1982-10-01), Sone et al.
patent: 4365604 (1982-12-01), Sone
patent: 4393841 (1983-07-01), Drows et al.
patent: 4440621 (1984-04-01), Kitahara et al.
patent: 4471648 (1984-09-01), Uchida et al.
patent: 4492205 (1985-01-01), Jundt et al.

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