Method and apparatus for controlling heater for heatng air-fuel

Details Method and apparatus for controlling heater for heatng air-fuel Method and apparatus for controlling heater for heatng air-fuel

1987-02-02

1988-03-22

Cox, Ronald B.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, F02B 300

Patent

active

047321288

ABSTRACT:
In an internal combustion engine, a heater for heating an air-fuel ratio sensor provided in the exhaust gas flow passage is controlled in accordance with a parameter of a load of the engine. That is, the heater is turned ON when the load parameter is not larger than a predetermined value, and the heater is turned OFF when the load parameter is larger than the predetermined value. The turning OFF of the heater is delayed with a predetermined delay time when the engine rotational speed is lower than a predetermined value, and the turning ON of the heater is delayed with the predetermined delay time when the engine rotational speed is higher than the predetermined value. Thus, the number of times that the heater is turned ON and OFF is decreased, thereby prolonging the life of the heater.

REFERENCES:
patent: 4303613 (1981-12-01), Yasuda
patent: 4354468 (1982-10-01), Sone
patent: 4359030 (1982-11-01), Sone
patent: 4538575 (1985-09-01), Chujo
patent: 4611562 (1986-09-01), Nakano

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