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Method and apparatus for determining motor operation states

  • US 10,451,474 B2
  • Filed: 02/19/2015
  • Issued: 10/22/2019
  • Est. Priority Date: 08/23/2012
  • Status: Active Grant
First Claim
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1. An apparatus adapted to be fixed to equipment containing an internal combustion engine, the apparatus for determining an operational state of the internal combustion engine, the apparatus comprising:

  • an accelerometer configured to measure vibration of the equipment in the time domain; and

    a processor coupled to the accelerometer, the processor being configured to;

    convert the measured vibration from the time domain into the frequency domain to produce a vibration characteristic;

    analyze the vibration characteristic to determine a current operational state of the internal combustion engine, the current operational state being selected from at least two different operational states including an idling state and a working state by;

    dividing the vibration characteristic into predetermined frequency ranges;

    calculating an average energy across the predetermined frequency ranges;

    comparing an energy in least one of the predetermined frequency ranges to the average energy; and

    determining that the current operational state is an idling state when the energy in the at least one of the predetermined frequency ranges is larger than the average energy,wherein the idling state is a state in which the internal combustion engine is turned on and idling, andprovide an output based on the determined operational state.

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