Combustion state-determining system for internal combustion engi

Details Combustion state-determining system for internal combustion engi Combustion state-determining system for internal combustion engi

1994-08-16

1995-12-05

Williams, Hezron E.

Measuring and testing

Vehicle chassis

Steering

73116, 36443108, G01M 1500

Patent

active

054718708

ABSTRACT:
A combustion state-determining system for an internal combustion engine, in which an ECU detects misfires occurring in the engine. A first counter counts the number of times of occurrence of misfires detected every predetermined number of firing cycles, and a second counter counts the number of times of occurrence of misfires detected every predetermined repetition period which is a predetermined integer times as long as the predetermined number of firing cycles. The count value of the first counter is compared with a first reference value and a second reference value smaller than the first reference value every predetermined number of firing cycles, to determine that the engine is in a combustion state adversely affecting at least one exhaust system component part when the former is larger than the latter. Further, the count value of the second counter is corrected by an updated value of the first counter when the updated count value is smaller than the first reference value and at the same time larger than the second reference value, and reset when first counter count value is smaller than the second reference value. The second counter count value is compared with a third reference value, to determine that the engine is in a degraded combustion state.

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