Abnormality diagnostic system for internal combustion engines
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United States of America Patent
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Oct 24, 1995
Grant Date -
N/A
app pub date -
Mar 25, 1993
filing date -
Mar 30, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention provides a diagnostic system for an internal combustion engine which detects abnormalities of input/output objects used in controlling operation of the engine when the engine is in respective predetermined operating conditions, and carries out respective predetermined fail-safe actions when abnormalities of the input/output are detected. When an abnormality of the input/output objects was detected on the last occasion and has also been detected on the present occasion, and at the same time it is determined that a change in the operating environment of the engine has occurred between when the abnormality was detected on the last occasion and when it has been determined on the present occasion, occurrence of the abnormality is finally determined.
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