Abnormality diagnostic system for internal combustion engines
First Claim
1. In an abnormality diagnostic system for an internal combustion engine, including abnormality detecting means for detecting abnormalities of input/output objects used in controlling operation of said engine when said engine is in respective predetermined operating conditions, and fail-safe means for carrying out respective predetermined fail-safe actions when abnormalities of said input/output objects are detected by said abnormality-detecting means;
- the improvement comprising;
operating environmental change-determining means for determining whether there has occurred a change in operating environment of said engine between when said abnormality-detecting means detected an abnormality of said input/output objects on a last occasion and when it has detected said abnormality on a present occasion; and
abnormality-determining means for finally determining occurrence of said abnormality of said input/output objects when said abnormality has been detected by said abnormality-detecting means and at the same time it is determined by said operating environmental change-determining means that a change in the operating environment of said engine has occurred between when said abnormality-detecting means detected said abnormality on the last occasion and when it has detected said abnormality on the present occasion.
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Accused Products
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.
51 Citations
10 Claims
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1. In an abnormality diagnostic system for an internal combustion engine, including abnormality detecting means for detecting abnormalities of input/output objects used in controlling operation of said engine when said engine is in respective predetermined operating conditions, and fail-safe means for carrying out respective predetermined fail-safe actions when abnormalities of said input/output objects are detected by said abnormality-detecting means;
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the improvement comprising; operating environmental change-determining means for determining whether there has occurred a change in operating environment of said engine between when said abnormality-detecting means detected an abnormality of said input/output objects on a last occasion and when it has detected said abnormality on a present occasion; and abnormality-determining means for finally determining occurrence of said abnormality of said input/output objects when said abnormality has been detected by said abnormality-detecting means and at the same time it is determined by said operating environmental change-determining means that a change in the operating environment of said engine has occurred between when said abnormality-detecting means detected said abnormality on the last occasion and when it has detected said abnormality on the present occasion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification