Method of determining activation of an exhaust gas concentration

Details Method of determining activation of an exhaust gas concentration Method of determining activation of an exhaust gas concentration

1990-09-07

1991-08-06

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Fuel injection system

F02D 4114

Patent

active

050368206

ABSTRACT:
An improved method of determining activation of an exhaust gas concentration sensor for detecting the concentration of an exhaust gas ingredient in exhaust gases from an internal combustion engine. The sensor comprises an exhaust gas ingredient-detecting element, and a heater for heating the element. An output signal from the sensor is used for air-fuel ratio feedback control of an air-fuel mixture supplied to the engine. It is determined that activation of the sensor has been completed when an output voltage from the sensor has become lower than a predetermined activation-determining reference voltage. The predetermined activation-determining reference voltage is changed depending on a time period over which the heater has been energized while the engine is in an operating condition under which the air-fuel ratio feedback control should be carried out.

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