Cranking capability estimation for a vehicular starting system

  • US 7,743,649 B1
  • Filed: 12/18/2008
  • Issued: 06/29/2010
  • Est. Priority Date: 12/18/2008
  • Status: Active Grant
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First Claim
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1. A method of determining a cranking capability of a starting system for an internal combustion engine, the method comprising the steps of:

  • (a) determining an average power output of a battery for the starting system during a start engine cranking interval;

    (b) determining a temperature of the starting system at an initiation of the start engine cranking interval;

    (c) looking up a predetermined average power output capability for a battery having a full state of charge at the determined temperature;

    (d) looking up a predetermined minimum average power output required of the battery for starting the respective engine at the determined temperature;

    (e) determining a state of function based on the average power output of steps (a), (c), and (d); and

    (f) identifying the cranking capability of the starting system in response to the determined state of function.

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