System for controlling exhaust gas sensor having heater

Details System for controlling exhaust gas sensor having heater System for controlling exhaust gas sensor having heater

2007-03-02

2010-10-05

Tran, Binh Q (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S274000, C060S276000, C060S277000, C060S284000, C060S320000, C123S688000, C123S690000, C123S697000, C219S492000, C219S494000, C073S114710, C073S114750

Reexamination Certificate

active

07805928

ABSTRACT:
An exhaust gas sensor for detecting oxygen concentration in exhaust gas is disposed in an exhaust pipe of an internal combustion engine. The sensor including a heater is controlled by a system that includes an electronic control unit. Water vapor contained in the exhaust gas is condensed on the sensor when the exhaust gas temperature is low. If the water condensation occurs while the sensor is heated by the heater, a sensor element may be cracked due to local cooling by the condensed water. To avoid the water condensation, the exhaust gas temperature is raised by retarding ignition timing of the engine for a certain period after the engine is started. After the exhaust gas is heated to a certain level, the sensor is heated. Alternatively, heating of the sensor is prohibited until the exhaust gas temperature becomes to a level at which no water condensation occurs. Thus, the cracking of the sensor element is avoided while making a delay of sensor activation minimal.

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Office Action dated Mar. 19, 2010 issued in corresponding Japanese Application No. 2006-104856 with an at least partial English-language translation thereof.

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