Method for evaluating an engine starting system
First Claim
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1. A method for evaluating a starting system for an internal combustion engine, comprising:
- determining a cranking resistance ratio between a starter and a battery of the starting system during engine cranking;
normalizing the cranking resistance ratio based upon an operating temperature of the starting system; and
evaluating the starting system based upon the normalized cranking resistance ratio.
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Abstract
An internal combustion engine employs a starting system. A method for evaluating the starting system includes determining a cranking resistance ratio between a starter and a battery of the starting system during engine cranking. The cranking resistance ratio is normalized based upon an operating temperature of the starting system, and the starting system is evaluated based upon the normalized cranking resistance ratio.
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Citations
17 Claims
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1. A method for evaluating a starting system for an internal combustion engine, comprising:
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determining a cranking resistance ratio between a starter and a battery of the starting system during engine cranking; normalizing the cranking resistance ratio based upon an operating temperature of the starting system; and evaluating the starting system based upon the normalized cranking resistance ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for evaluating a starting system for an internal combustion engine, comprising:
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determining a cranking resistance ratio between a starter and a battery of the starting system based upon a single datapoint comprising a minimum cranking voltage captured during engine cranking; normalizing the cranking resistance ratio based upon an operating temperature of the starting system; and evaluating the starting system based upon the normalized cranking resistance ratio. - View Dependent Claims (9, 10, 11, 12)
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- 13. A method for monitoring an electrical starting system for an internal combustion engine, comprising detecting a fault with one of a starter motor and a battery when a cranking resistance ratio determined between a cranking voltage and an open circuit voltage of the battery is greater than a predetermine threshold, said cranking resistance ratio normalized based upon a temperature of the battery.
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