A/F ratio estimator for multicylinder internal combustion engine

Details A/F ratio estimator for multicylinder internal combustion engine A/F ratio estimator for multicylinder internal combustion engine

1993-12-01

1995-10-31

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123694, F02D 4114

Patent

active

054620376

ABSTRACT:
An air/fuel ratio estimator for estimating an air/fuel ratio of a mixture supplied to each cylinder of a multicylinder internal combustion engine through an output of an air/fuel ratio sensor installed at a confluence point of an exhaust system of the engine. The estimator includes first device for assuming the output of the air/fuel ratio sensor as an average value made up of a sum of products of past firing histories of each cylinder weighted by a predetermined value, and establishing a model using the air/fuel ratio as a state variable, a second device for obtaining a state equation with respect to the state variable. An observer is provided to estimate the unmeasured state variable indicative of the air/fuel ratio and the air/fuel ratio at each cylinder is estimated from an output of the observer. In the configuration upper and lower limit is established for the state variable such that it is replaced with its initial value if it exceeds either limit. As a result, a range of change of the variable is decreased so that the estimator can be realized on a low-performance microcomputer mounted on a vehicle.

REFERENCES:
patent: 4869222 (1989-09-01), Klassen
patent: 4962741 (1990-10-01), Cook et al.

Affiliated with

Also associated with

Rating

A/F ratio estimator for multicylinder internal combustion engine does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with A/F ratio estimator for multicylinder internal combustion engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A/F ratio estimator for multicylinder internal combustion engine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1766591