Air-fuel ratio control system for internal combustion engines

Details Air-fuel ratio control system for internal combustion engines Air-fuel ratio control system for internal combustion engines

1996-07-31

1998-08-25

Wolfe, Willis R.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

123674, F01N 320, F02D 4114

Patent

active

057972613

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine has a first air-fuel ratio sensor arranged in an exhaust passage at a location upstream of a catalyst and a second air-fuel ratio sensor arranged in the exhaust passage at a location downstream of the catalyst. In response to an output from the first air-fuel ratio sensor, an air-fuel ratio correction coefficient is calculated for correcting an amount of fuel supplied to the engine in a manner such that an air-fuel ratio of a mixture supplied to the engine is converged to a desired air-fuel ratio. In response to an output from the second air-fuel ratio sensor, a desired air-fuel ratio correction amount is calculated for correcting the desired air-fuel ratio. A learned value of the desired air-fuel ratio correction amount is calculated, and the desired air-fuel ratio is corrected. Calculation of the learned value of the desired air-fuel ratio correction amount is permitted depending on a ratio between a time period over which the output from the second air-fuel ratio sensor is on a richer side with respect to a predetermined reference value and a time period over which the output from the second air-fuel ratio sensor is on a leaner side with respect to the predetermined reference value.

REFERENCES:
patent: 4831838 (1989-05-01), Nagai et al.
patent: 5193339 (1993-03-01), Furuya
patent: 5251437 (1993-10-01), Furuya
patent: 5255512 (1993-10-01), Hamburg et al.
patent: 5335493 (1994-08-01), Uchida et al.
patent: 5341641 (1994-08-01), Nakajima et al.
patent: 5361582 (1994-11-01), Uchida et al.

Affiliated with

Also associated with

Rating

Air-fuel ratio control system for internal combustion engines does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Air-fuel ratio control system for internal combustion engines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Air-fuel ratio control system for internal combustion engines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-29604