Method for monitoring aircraft battery status

  • US 4,968,942 A
  • Filed: 02/21/1989
  • Issued: 11/06/1990
  • Est. Priority Date: 10/14/1988
  • Status: Expired due to Term
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First Claim
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1. A battery condition monitoring apparatus for providing status and advice concerning a storage battery in an aircraft, comprising:

  • (a) microprocessor means located on said aircraft for controlling the operations of said apparatus;

    (b) software means for instructing said microprocessor means to control the sequence of said operations;

    (c) memory means connected to said microprocessor means for storing said software instructions and predetermined relationships between the internal resistance of said battery, the tolerable limit of said internal resistance and the ambient temperature of said battery;

    (d) digital to analog converter means connected to said microprocessor means for converting digital signals from said microprocessor means to analog signals;

    (e) direct current power generator means, connected to said digital to analog converter means, for producing electric power at voltage and current, required by said microprocessor means;

    (f) current sensor means, connected to a terminal of said battery;

    for measuring the current passing into and out of said battery;

    (g) temperature sensor means, located near said battery, for measuring the ambient temperature of said battery;

    (h) voltmeter means for measuring the voltages of said battery, current sensor, temperature sensor and direct current power generator means;

    (i) analog to digital converter means, connected to said voltmeter, for converting the analog signals from the said voltage measurements to digital signals appointed for transfer to said microprocessor;

    (j) second software means for analyzing said current, voltages and temperature, and for determining the internal resistance and polarization of said battery, defects in said battery, and low temperature starting limit, to establish said battery maintenance and replacement requirements;

    (k) actuator means for controlling the electrical circuits connecting said sensors, said direct current power generating means and said battery; and

    (l) display means, controlled by said microprocessor for indicating said battery status and advice.

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