Air/fuel ratio estimation system for internal combustion engine

Details Air/fuel ratio estimation system for internal combustion engine Air/fuel ratio estimation system for internal combustion engine

1995-02-03

1996-10-15

Teska, Kevin J.

Boots, shoes, and leggings

36443103, 36443104, 60274, 60275, 60276, 60285, 123692, 123673, 123672, G06G 770, F02D 4114

Patent

active

055660711

ABSTRACT:
A system for estimating air/fuel ratios in the individual cylinders of a multicylinder internal combustion engine from the output of a single air/fuel ratio sensor installed at the exhaust system of the engine. A mathematical model is first designed to describe the behavior of the exhaust system which accepts the output of the air/fuel ratio sensor. An observer is designed to observe the internal state of the mathematical model and calculates the output which estimates the air/fuel ratios in the individual cylinders of the engine. In this configuration, when engine speed becomes high, the observer matrix calculation is discontinued, because it is difficult to ensure a time enough for calculation. Similarly, at a low engine load etc., the calculation is discontinued. Apart from the above, when a desired air/fuel ratio changes frequently such as when air/fuel ratio perturbation control is conducted, the desired air/fuel ratio is input to the observer as a second input. This will similarly be applied in a situation where the desired air/fuel ratio changes abruptly.

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