Method for controlling the fuel-air ratio of an internal combust

Details Method for controlling the fuel-air ratio of an internal combust Method for controlling the fuel-air ratio of an internal combust

1996-12-05

1998-11-17

Argenbright, Tony M.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60285, 123696, F02D 4114

Patent

active

058361537

ABSTRACT:
A method for controlling the fuel-air ratio of an internal combustion engine in which the output signal of a first lambda probe, which is arranged in front of a catalytic converter in the exhaust pipe of the internal combustion engine, is fed to a controller. The controller gives off a setting variable for the fuel-air ratio, and a further signal which is obtained from the output signal of a second lambda probe arranged behind the catalytic converter is fed to the controller. In order to permit an accurate and adjustable control which further improves the fuel-air ratio in the sense of a reduction of the exhaust emission, a hold time is obtained on the output signal of the second lambda probe as a function of the time of the reversal of the output signal of the first lambda probe, whereby the output signal of the controller is shifted in time.

REFERENCES:
patent: 5307625 (1994-05-01), Junginger et al.
patent: 5379591 (1995-01-01), Iwata et al.

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