Battery and starter circuit monitoring system

  • US 5,519,383 A
  • Filed: 06/10/1994
  • Issued: 05/21/1996
  • Est. Priority Date: 06/10/1994
  • Status: Expired due to Term
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First Claim
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1. A battery and starter circuit monitoring system, comprising:

  • a test circuit having a first input terminal for connection to a battery to be tested;

    the circuit having an indicator for providing a visual indication when an available reserved power capacity of the battery is below a first minimum value under full load conditions;

    a first switching device for controlling connection of the indicator to the input terminal, the switching device having a non-conductive state in which the indicator is off and a conductive state in which the indicator is on;

    control means for controlling switching of the switching device between the non-conductive and conductive state, the control means including a detector for detecting a first voltage at the input terminal and having an output dependent on said first voltage and switching means responsive to the detector output for switching the switching device from its non-conductive to its conductive state if the detected battery reserved power capacity falls below said selected minimum value;

    said circuit having a second input terminal for connection to an input terminal of a component connected to said battery to detect a second voltage reaching the component, a second indicator for providing a visual indication when the second voltage reaching the component falls below a second minimum value, a second switching device for controlling connection of said second indicator to said second input terminal, and additional control means for controlling switching on and off of said second switching device, said additional control means comprising means for detecting if the second voltage at said second input terminal falls below said second minimum value and switching on said second switching device to actuate said second indicator if a voltage below said second minimum value is detected.

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