Method for adapting warm-up enrichment

Details Method for adapting warm-up enrichment Method for adapting warm-up enrichment

1996-01-19

1996-10-15

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123686, 123687, F02D 4106

Patent

active

055644066

ABSTRACT:
The invention is directed to a method of metering fuel to the engine during warm-up operation which precedes normal operation of the engine during which a first amount of fuel is metered to the engine. The engine is equipped with a lambda control and a device for detecting a variable suitable for distinguishing warm-up operation and normal operation of the engine. A predetermined corrective factor (FWL) is provided in dependence upon the variable. A second amount of fuel is metered to the engine during the warm-up operation which is increased by the corrective factor (FWL) so that the second amount is greater than the first amount. Lambda control is engaged during the warm-up operation and provides a desired lambda value (.lambda..sub.des). A quantity is formed indicative of the mean deviation of the actual lambda value (.lambda..sub.act) from the desired lambda value (.lambda..sub.des) when the lambda control is engaged. The quantity is applied to increase the corrective factor (FWL) when the quantity indicates that the mean value of the actual lambda value (.lambda..sub.act) is greater than the desired lambda value (.lambda..sub.des) and decrease the corrective factor (FWL) when the quantity indicates that the mean value of the actual lambda value (.lambda..sub.act) is less than the desired lambda value (.lambda..sub.des).

REFERENCES:
patent: 4205635 (1980-06-01), Kirn et al.
patent: 4787357 (1988-11-01), Nishikawa et al.
patent: 5279275 (1994-01-01), Freudenberg
patent: 5483946 (1996-01-01), Hamburg et al.

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