Electrically heated catalytic converter system for an engine

Details Electrically heated catalytic converter system for an engine Electrically heated catalytic converter system for an engine

1994-06-16

1995-09-05

Warden, Robert J.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

422108, 422173, 422180, 60277, 60284, 60286, 60300, F01N 320

Patent

active

054476968

ABSTRACT:
An electrically heated catalytic converter system of the present invention includes a plurality of heater-converters, each heater-converter being disposed on one of a plurality of exhaust passages of an engine. Each heater-converter includes a catalyst bed which carries particles of a three-way reducing and oxidizing catalyst, an electric heater which is turned on during the start up of the engine to rapidly heat at least a portion of the catalyst bed, and a temperature detector disposed in the catalyst bed. The system also includes an electronic control unit (ECU) that detects the failure of the converter system. When the engine is started, the ECU calculates the difference in the temperatures of the catalyst beds, and if this difference in the temperatures becomes larger than a predetermined value, the ECU determines that one of the heater-converters has failed, i.e., the electrically heated catalytic converter system has failed. The failure of the converter system can also be determined by comparing the rate of temperature rise of the converters, or by determining a temperature or rate of temperature rise difference between a catalytic converter and the exhaust gas entering the catalytic converter.

REFERENCES:
patent: 5233831 (1993-08-01), Hitomi et al.
patent: 5261230 (1993-11-01), Yuuki et al.
patent: 5315824 (1994-05-01), Takeshima
patent: 5323607 (1994-06-01), Tanaka et al.

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