Power supply control system for heater used in gas sensor

Details Power supply control system for heater used in gas sensor Power supply control system for heater used in gas sensor

2005-03-22

2005-03-22

Hoang, Tu (Department: 3742)

Electric heating

Heating devices

With power supply and voltage or current regulation or...

C219S497000

Reexamination Certificate

active

06870142

ABSTRACT:
A heater control system is provided for controlling the temperature of a heater used to heat a solid electrolyte-made sensor element of a gas concentration sensor up to a given temperature at which the sensor element is activated to provide a correct gas concentration output for controlling a preselected variable used in, for example, an automotive air-fuel ratio control system. The heater control system measures a resistance value of the sensor element and controls an electric power supplied to the heater as a function of the resistance value. The heater control system is designed to determine a controlled variable properly used to control the heater, thereby resulting in improved controllability of a power supply to the heater and also works to minimize an error in determining the resistance of the heater.

REFERENCES:
patent: 6009866 (2000-01-01), Sagisaka et al.
patent: 6083370 (2000-07-01), Kato et al.
patent: 6540892 (2003-04-01), Strohmaier
patent: 6651639 (2003-11-01), Hada et al.
patent: 6812436 (2004-11-01), Nomura et al.
patent: 10-232220 (1998-09-01), None
patent: 10-300716 (1998-11-01), None
patent: 2000-65780 (2000-03-01), None

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