Electric heating – Heating devices – With power supply and voltage or current regulation or...
Reexamination Certificate
2003-05-12
2010-10-26
Ralis, Stephen J (Department: 3742)
Electric heating
Heating devices
With power supply and voltage or current regulation or...
C219S494000, C219S205000, C123S697000, C073S023200, C429S006000
Reexamination Certificate
active
07820949
ABSTRACT:
A control apparatus for a gas sensor with a built-in heater is provided which can prevent damage to, deterioration of, and reduction in accuracy of detection of, a gas sensor. When an ignition switch is turned ON, supply of electricity to a heater27starts, and when the temperature in the vicinity of a gas sensor15(gas temperature of gas detection chamber24) Ts becomes greater than a predetermined temperature #Ti at start, or when a predetermined electricity supply time after start of supply of electricity to the heater27has elapsed, the gas sensor15is started. The flow of off-gas is started simultaneously with starting of the gas sensor15, or after starting. When the ignition switch is turned OFF, the flow of off gas is stopped, and the supply of electric power to the gas sensor15is stopped. In a state where a temperature difference ΔT between the gas temperature Ts inside the gas detection chamber24, and an upstream gas temperature Tg is maintained within a predetermined range, the supply of electricity to the heater27is stopped after a predetermined time has elapsed after operation of the gas sensor15is stopped.
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Abe Hiroyuki
Eguchi Tsuyoshi
Sasaki Takashi
Suzuki Akihiro
Honda Motor Co. Ltd.
Lahive & Cockfield LLP
Laurentano, Esq. Anthony A.
Ralis Stephen J
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