Apparatus for controlling heater for oxygen sensor

Details Apparatus for controlling heater for oxygen sensor Apparatus for controlling heater for oxygen sensor

1991-10-09

1992-09-22

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4114

Patent

active

051487950

ABSTRACT:
An apparatus for controlling a heater for an oxygen sensor includes a heater controller for detecting a heater resistance value of a heater and for controlling the heater so that a detected resistance value of the heater is equal to a target resistance value. A specific operating condition detecting unit detects a specific operating condition of the internal combustion engine where the air-fuel ratio is other than a stoichiometric air-fuel ratio. A target resistance value changing unit changes the target resistance value when the air-fuel ratio in the specific operating condition indicated by the sensor output signal is s outside a normal range of air-fuel ratio which should be detected in the specific operating condition.

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patent: 4694809 (1987-09-01), Nakano et al.
patent: 4911130 (1990-03-01), Takahashi et al.
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patent: 4947819 (1990-08-01), Takahashi et al.
patent: 4993392 (1991-02-01), Tanaka et al.
patent: 5067465 (1991-11-01), Yamasaki et al.

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