Apparatus for controlling a heater for heating an air-fuel ratio

Details Apparatus for controlling a heater for heating an air-fuel ratio Apparatus for controlling a heater for heating an air-fuel ratio

1997-06-17

1998-05-19

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123697, F02D 4114, G01N 2704

Patent

active

057524939

ABSTRACT:
A heater control apparatus for an air-fuel ratio sensor that is capable of supplying optimum power, regardless of the coolant temperature of an internal combustion engine at the engine start-up, is provided. When the internal combustion engine is started, a switching element 122 is continuously held at ON state, to continuously supply power to a heater 112 of the air-fuel ratio sensor 11. The duty cycle of the switching element is controlled so that the heater temperature is maintained at 1100.degree. C., after the heater resistance, which is calculated from the voltage applied to the heater and the current flowing through the heater, has reached a predetermined value, and so that a sensing element 111 is maintained at a temperature of 710.degree. C., after the air-fuel ratio sensor was activated. In performing the control, the power supplied to the heater is increased by adding an auxiliary power calculated as a function of the coolant temperature detected by a coolant temperature sensor 142 and the time elapsed since the engine was started up, thereby preventing an excessive temperature rise of the heater and a delay in the activation of the air-fuel ratio sensor.

REFERENCES:
patent: 4694809 (1987-09-01), Nakano et al.
patent: 4889098 (1989-12-01), Suzuki et al.
patent: 4993392 (1991-02-01), Tanaka et al.
patent: 5067465 (1991-11-01), Yamasaki et al.

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