Exhaust system ambient temperature detection system for internal

Details Exhaust system ambient temperature detection system for internal Exhaust system ambient temperature detection system for internal

1996-06-14

1998-04-21

Wolfe, Willis R.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60284, 60300, 73 2332, 123697, F02D 4114, F01N 320, F01N 328

Patent

active

057406758

ABSTRACT:
A system for detecting the ambient temperature of an exhaust system of an internal combustion engine, where an oxygen sensor (O.sub.2 sensor) is installed for detecting oxygen content in exhaust gases generated by the engine. The oxygen sensor has a detection element and a heater for heating the detection element when supplied with current. The exhaust system is further provided with a catalytic converter which similarly has a heater for heating the catalyst for promoting the activation thereof. The electric resistance of the sensor heater is detected and based on the detected resistance, the ambient temperature of the exhaust system is detected or estimated in accordance with characteristics preestablished with respect to the electric resistance of the heater. With the arrangement, it becomes possible to detect the ambient temperature of the exhaust system without using a temperature sensor. The detected ambient temperature is used for controlling the current supply to the heater of the catalytic converter.

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patent: 5357752 (1994-10-01), Lucchesi
patent: 5600947 (1997-02-01), Cullen
patent: 5655364 (1997-08-01), Ma

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