Method and apparatus for controlling energizing of heater in air

Details Method and apparatus for controlling energizing of heater in air Method and apparatus for controlling energizing of heater in air

1997-06-23

1999-07-13

Paschall, Mark

Electric heating

Heating devices

Combined with diverse-type art device

219492, 219202, 219508, 219486, 219485, 12317916, H05B 102

Patent

active

059222263

ABSTRACT:
An apparatus and method for controlling the energization of a plurality of sensors used for detecting the air-fuel ratio in an internal combustion engine. The engine has an exhaust passage, and the air-fuel ratio sensors are provided in the exhaust passage. Each sensor includes an element for outputting a signal corresponding an oxygen concentration of the exhaust gas from the engine and a heater for heating the element. The element is activated at a predetermined temperature. A Central Processing Unit (CPU) controls the energizing the heaters. The CPU starts energizing each heater at different time. Alternatively, the CPU inputs duty signals having different phases to the heaters. As a result, the total current load from the heaters is lowered.

REFERENCES:
patent: 4282422 (1981-08-01), Payne et al.
patent: 4504732 (1985-03-01), Bube et al.
patent: 5012070 (1991-04-01), Reed
patent: 5523547 (1996-06-01), Miller
patent: 5528016 (1996-06-01), Mogi

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