Method for checking the conversion capability of a catalytic con

Details Method for checking the conversion capability of a catalytic con Method for checking the conversion capability of a catalytic con

1996-06-20

1998-03-31

Richter, Sheldon

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 123674, F01N 320, F01N 900

Patent

active

057325499

ABSTRACT:
In a method for checking the conversion capability of a catalytic converter, in particular a precatalytic converter associated with internal combustion engines of motor vehicles, the checking is undertaken through the use of a temperature measurement immediately downstream of the catalytic converter. Initially the temperature at the beginning and at the end of a predetermined idling phase is measured for a predetermined number of idling phases, following an overrun phase in predetermined operating states of a motor vehicle with an internal combustion engine. Then the difference of the temperature measurements for each idling phase is formed. The sum of all of the temperature differences and the sum of the duration of the idling phases are formed and subsequently a quotient of these results is formed. This quotient determines an average gradient. The average gradient determined in this way is compared with a limiting value and the catalytic converter is recognized as defective if the predetermined limiting value is exceeded. The method may be applied to motor vehicles with internal combustion engines.

REFERENCES:
patent: 5060474 (1991-10-01), Aramaki
patent: 5140810 (1992-08-01), Kuroda
patent: 5267439 (1993-12-01), Raff et al.
patent: 5363646 (1994-11-01), Orzel et al.
patent: 5435172 (1995-07-01), Pelters et al.
Patent Abstracts of Japan, vol. 14, No. 253, Jun. 9, 1992: including JP-A-4-60106 (Mazda) Feb. 26, 1992.

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