Method of checking the efficiency of a catalytic convertor in an

Details Method of checking the efficiency of a catalytic convertor in an Method of checking the efficiency of a catalytic convertor in an

1996-12-06

1998-06-09

Argenbright, Tony M.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 731181, F01N 320

Patent

active

057619018

ABSTRACT:
A method of checking the efficiency of a catalytic converter in an internal combustion engine in which a ratio is formed from the amplitude of the output signal of a lambda probe arranged behind the catalytic converter and from the amplitude of the output signal of a lambda probe arranged in front of the catalytic converter. The ratio is compared with a threshold value, the catalytic converter being recognized as deficient if the ratio is less than the threshold value. In order to compensate for the lack of sharpness resulting from the manufacturing process and the aging of the probe, the method provides for determining the efficiency of the catalyst in which an extreme value of the corresponding probe output signal is determined for each probe after each probe reversal.

REFERENCES:
patent: 5157921 (1992-10-01), Ito et al.
patent: 5237818 (1993-08-01), Ishii et al.
patent: 5341642 (1994-08-01), Kurihara et al.
patent: 5363646 (1994-11-01), Orzel et al.
patent: 5386693 (1995-02-01), Orzel

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