Combustion-conditon diagnostic system and method for a multicyli

Details Combustion-conditon diagnostic system and method for a multicyli Combustion-conditon diagnostic system and method for a multicyli

1993-06-02

1996-01-16

Zanelli, Michael

Boots, shoes, and leggings

36443108, 731173, G06F 1700, F02D 4104

Patent

active

054853745

ABSTRACT:
A system for accurately diagnosing the combustion condition of a multicylinder engine from the fluctuation of revolution speeds among individual cylinders in a wide range of engine revolution speeds, comprising a functional pattern storage which stores therein a functional pattern on the fluctuational error of a combustion condition parameter corresponding to the variation of the revolution speeds; a learning unit which specifies the functional pattern on the basis of the revolution speeds and the combustion condition parameter successively for the respective cylinders while making corrections if necessary, and which evaluates the fluctuational error of the combustion condition parameter for the revolution speed of a predetermined one of the cylinders; and a correction unit which subtracts the evaluated fluctuational error from the combustion condition parameter for the predetermined cylinder, and which sets the difference of the subtraction as a new combustion condition parameter.

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