Automotive battery charging system tester

  • US 8,198,900 B2
  • Filed: 03/02/2004
  • Issued: 06/12/2012
  • Est. Priority Date: 07/29/1996
  • Status: Expired due to Term
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First Claim
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1. An apparatus for testing a charging system of an automotive vehicle, comprising:

  • electrical connections configured to couple to a battery of the vehicle;

    a user input configured to receive a battery rating from an operator;

    a display configured to display information to the operator; and

    a microprocessor configured to;

    prompt the operator to input rating information for the battery using the input;

    receive the rating information for the battery from the operator from the input;

    perform a battery test on the battery through the electrical connections to the battery;

    measure a dynamic parameter of the battery through the electrical connections to the battery;

    determine a condition of the battery by comparing the measured dynamic parameter to the received rating, the battery test result indicative of a battery condition, the battery condition including a fully charged battery and a battery which is not fully charged;

    detect revving of the engine by observing an increased frequency of an AC ripple of a voltage measured through the electrical connectors to the battery;

    detect a diode or stator problem if the AC ripple exceeds a threshold;

    instruct the operator to start an engine of the vehicle through the display;

    detect starting of the engine of the automotive vehicle by the operator by a drop in a voltage measured through the electrical connections to the battery;

    measure a starting voltage through the electrical connections to the battery during starting of the engine of the automotive vehicle; and

    provide a charge battery output to the operator through the display if the measured starting voltage is low relative to a threshold and the battery test result is indicative of a battery which is not fully charged,provide a cranking voltage low output to the operator through the display if the measured starting voltage is low relative to a threshold and the battery test result is indicative of a fully charged battery;

    provide a cranking voltage normal output to the operator through the display if the starting voltage is normal relative to a threshold and the battery test result is indicative of a fully charged battery.

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