Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – With auxiliary means to condition stimulus/response signals
Patent
1991-09-04
1993-01-26
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
With auxiliary means to condition stimulus/response signals
324725, 324720, 73765, G01N 2758, G01N 2712
Patent
active
051825198
ABSTRACT:
A heater control device for an air-fuel ratio sensor which comprises: an air-fuel ratio sensor comprising a sensor element which detects an air-fuel ratio state of exhaust gas of an engine, and a heater which heats the sensor elements; a heater current flow control means for controlling a value of a resistance of the heater to be a target resistance value; a harness having a couple of couplers at both ends thereof which connects between the air-fuel ratio sensor and the heater current flow control means; and a current detecting resistance which is incorporated in the coupler on the air-fuel ratio sensor side, or provided adjacent to said coupler on the air-fuel ratio sensor side, and which is connected to the heater in series and detects current of the heater.
REFERENCES:
patent: 3117448 (1964-01-01), Gilmont
patent: 3201990 (1965-08-01), Wald
patent: 3225297 (1965-12-01), Burley
patent: 3339414 (1967-09-01), Coor
patent: 4000454 (1976-12-01), Brakl
patent: 4294116 (1981-10-01), Yamamura
patent: 4309653 (1982-01-01), Stack
patent: 4516865 (1985-05-01), Hideo
Mitsubishi Denki & Kabushiki Kaisha
Solis Jose M.
Wieder Kenneth A.
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