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Method and device for predicting the starting ability of a vehicle

  • US 7,528,570 B2
  • Filed: 03/17/2004
  • Issued: 05/05/2009
  • Est. Priority Date: 04/16/2003
  • Status: Expired due to Fees
First Claim
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1. A device for predicting the starting ability of a vehicle having an internal combustion engine and a starter which is supplied with electrical power by a vehicle battery, comprising:

  • a battery state detection device which determines a state of charge of the vehicle battery;

    a first device which uses a discharge current curve to determine a charge drained from the vehicle battery during a predefined time period when the vehicle is shut off;

    a second device which calculates the state of charge of the vehicle battery after the predefined time period;

    a third device that determines an electrical battery variable in which a characteristics map of the electrical battery variable is stored as a function of the state of charge of the vehicle battery, a value of the electrical battery variable, which is present after the predefined time period, being read out from the characteristics map;

    a measurement device configured to measure an electrical variable of the vehicle battery during a starting operation, wherein the measured electrical variable is used to correct the stored characteristics map; and

    a prediction device which uses the read out value of the electrical battery variable to determine whether or not the vehicle is able to start after the predefined time period.

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