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Method and apparatus for determining an operating point of a work machine

  • US 8,763,464 B2
  • Filed: 11/18/2011
  • Issued: 07/01/2014
  • Est. Priority Date: 05/20/2009
  • Status: Active Grant
First Claim
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1. A method for determining an operating point of a work machine or of an asynchronous motor driving the such a machine, whereinthe operating point is characterized by a power input of the work machine or by a delivery rate of the work machine;

  • one or more operating point-dependent measurement variables of the work machine are detected by one or more sensors;

    measured values of the variables are evaluated or stored while the work machine is in operation; and

    the operating point is determined without the use of electrical measurement variables of the asynchronous drive motor;

    said method comprising;

    determining a frequency linearly proportional to the rotational sound of the work machine by signal analysis of a measured mechanical variable selected from the group consisting of pressure, differential pressure, force, vibration, solid-borne noise, and airborne noise;

    determining the rotational speed (n) of the drive machine from said frequency; and

    determining the operating point from the slip-induced rotational speed/torque dependence of the asynchronous motor.

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