Method for the calibration of a lambda probe in an internal comb

Details Method for the calibration of a lambda probe in an internal comb Method for the calibration of a lambda probe in an internal comb

1996-12-05

1998-06-30

Argenbright, Tony M.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 73 2332, 123694, F01N 900, F02D 4114

Patent

active

057716870

ABSTRACT:
A method for the calibration of a lambda probe in an internal combustion engine in which the lambda probe is arranged in front of and/or behind a catalytic converter in order to control a fuel-air mixture of the internal combustion engine. The lambda probe gives off signal values during a measurement period as a function of the exhaust gas produced from the fuel-air mixture. In order to compensate for the lack of sharpness resulting from a manufacturing process of the lambda probe and an aging of the probe, a method is proposed for the calibration of the lambda probe in which the catalytic converter is supplied with an overly rich fuel-air mixture. During this time the corresponding signal measurement values of the lambda probe are measured independently of other control signals. Upon a further processing of the probe signal, a correction value is formed therefrom, which correction value is fed to the probe signal in the controlled operating state of the internal combustion engine.

REFERENCES:
patent: 4601809 (1986-07-01), Kitahara
patent: 4609453 (1986-09-01), Shimomura
patent: 4751907 (1988-06-01), Yamamoto et al.
patent: 4944274 (1990-07-01), Itsuji et al.
patent: 5323635 (1994-06-01), Ueno et al.
patent: 5392598 (1995-02-01), White et al.

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