Device for determining an abnormal degree of deterioration of a

Details Device for determining an abnormal degree of deterioration of a Device for determining an abnormal degree of deterioration of a

1996-07-24

1998-05-19

Wolfe, Willis R.

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

F01N 328

Patent

active

057523827

ABSTRACT:
A device for determining an abnormal degree of deterioration of catalyst of a catalytic converter, arranged in an internal combustion engine exhaust system, is disclosed. The device comprises a temperature sensor for measuring a temperature of the catalyst and an electronic control unit which assumes a temperature of the catalyst on the basis of the engine operating condition and calculates a ratio of a varying value of the measured temperature by the temperature sensor to a varying value of the assumed temperature and determines that the degree of deterioration of the catalyst is abnormal when the ratio is smaller than a predetermined value.

REFERENCES:
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patent: 5355671 (1994-10-01), Maus et al.
patent: 5435172 (1995-07-01), Pelters et al.
patent: 5560200 (1996-10-01), Maus et al.
patent: 5610844 (1997-03-01), Maus et al.
patent: 5626014 (1997-05-01), Hepburn et al.
patent: 5630315 (1997-05-01), Theis

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