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

1984-10-30

1986-09-16

Wolfe, Jr., Willis R.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, 204425, 204426, F02M 700, G01N 2746

Patent

active

046115625

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 the sensor element. A method is disclosed for controlling the power supplied to said heater by restricting it to be less than a predetermined value. This restriction may be done by controlling the value of a relatively steady current flowing through said heater, or alternatively may be done by supplying an intermittent voltage to said heater and by controlling the duty factor of said intermittent voltage. The power supplied to said heater may be determined by detecting the current flowing through said heater, or may be determined by detecting the voltage across said heater and the current flowing through said heater. Thereby, during engine heating up operation, the temperature of the heater element is raised as quickly as practicable, without any risk of over quick heating of the heater occurring, which might lead to damage thereto. Accordingly it is ensured that engine performance and the quality of exhaust gas emissions at the time of such engine warming up operation are good. A system is also described for implementing this method.

REFERENCES:
patent: 4332225 (1982-06-01), Cox et al.
patent: 4356065 (1982-10-01), Dietz
patent: 4464244 (1984-08-01), Uchida et al.
patent: 4500412 (1985-02-01), Takahashi et al.

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