Matrix method and apparatus for engine analysis
First Claim
1. In an apparatus for diagnosing at least one selected system of an internal combustion engine which includes means for receiving digital electrical measurement signals corresponding to measured values of a plurality of engine operating parameters associated with the engine system, means for storing digital electrical signals for the programmed diagnosis of the at least one selected system of the internal combustion engine and means for processing the digital electrical measurement signals in accordance with the programmed diagnosis, the improvement comprising;
- the means for processing in cooperation with said means for storing making at least one yes/no comparison of a plurality of selected digital electrical measurement signals with respective predetermined values stored in the means for storing and providing the result of each such comparison as a digital result signal, selecting and evaluating digital result signals indicative of the yes/no comparison results in accordance with a predetermined AND diagnostic equation stored in the means for storing, and generating a signal related to the state of the at least one engine system being diagnosed based upon one or more AND correspondences only, of the digital result signals selected according to the predetermined diagnostic equation.
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Abstract
A results based "AND" matrix method and means for the diagnostic analysis of an internal combustion engine is described. A diagnostic evaluation of the operating condition of an internal combustion engine is achieved, based solely on AND function relationships with respect to currently measured engine parameter values and a diagnostic equation, without the need for making, collecting and correlating a plurality of separate evaluative judgments regarding engine operating parameters.
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Citations
8 Claims
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1. In an apparatus for diagnosing at least one selected system of an internal combustion engine which includes means for receiving digital electrical measurement signals corresponding to measured values of a plurality of engine operating parameters associated with the engine system, means for storing digital electrical signals for the programmed diagnosis of the at least one selected system of the internal combustion engine and means for processing the digital electrical measurement signals in accordance with the programmed diagnosis, the improvement comprising;
the means for processing in cooperation with said means for storing making at least one yes/no comparison of a plurality of selected digital electrical measurement signals with respective predetermined values stored in the means for storing and providing the result of each such comparison as a digital result signal, selecting and evaluating digital result signals indicative of the yes/no comparison results in accordance with a predetermined AND diagnostic equation stored in the means for storing, and generating a signal related to the state of the at least one engine system being diagnosed based upon one or more AND correspondences only, of the digital result signals selected according to the predetermined diagnostic equation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. In a method for diagnosing at least one selected system of an internal combustion engine which includes the steps of receiving digital electrical measurement signals corresponding to measured values of a plurality of engine operating parameters associated with the engine system and processing the digital electrical measurement signals in accordance with a programmed diagnosis, the improvement comprising:
making at least one yes/no comparison of a plurality of selected digital electrical measurement signals with respective predetermined values, providing the result of each such comparison as a digital result signal, selecting and evaluating digital result signals indicative of the yes/no comparison results in accordance with a predetermined AND diagnostic equation, and generating a signal related to the state of the at least one engine system being diagnosed based upon one or more AND correspondences only, of the digital result signals selected according to the predetermined AND diagnostic equation.
Specification