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WHEEL LOADER AND BUCKET LOAD CALCULATION METHOD

  • US 20200131739A1
  • Filed: 09/19/2018
  • Published: 04/30/2020
  • Est. Priority Date: 09/29/2017
  • Status: Active Grant
First Claim
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1. A wheel loader comprising:

  • a vehicle body;

    a working device that includes a lift arm, a lift arm cylinder, a bucket, and a bucket cylinder, the lift arm being disposed at the front of the vehicle body and coupled to the vehicle body via a hinge pin, the lift arm cylinder rotating the lift arm in a vertical direction, the bucket being coupled to a tip of the lift arm, the bucket cylinder rotating the bucket in the vertical direction;

    a lift arm angle sensor that detects the angle of the lift arm;

    a pressure sensor that detects the pressure of the lift arm cylinder;

    a control device that calculates a load on the bucket; and

    a vehicle body information database that stores vehicle body information including dimension data on the working device,wherein, in an unloaded state of the bucket, the control device calculates an unloaded moment, namely, the moment around the hinge pin, from the pressure of the lift arm cylinder that is detected by the pressure sensor, the angle of the lift arm that is detected by the lift arm angle sensor, and the dimension data extracted from the vehicle body information database,in a loaded state of the bucket, the control device calculates a loaded moment, namely, the moment around the hinge pin, from the pressure of the lift arm cylinder that is detected by the pressure sensor, the angle of the lift arm that is detected by the lift arm angle sensor, and the dimension data extracted from the vehicle body information database, andthe control device calculates the load on the bucket by dividing the difference between the unloaded moment and the loaded moment by the horizontal distance between the hinge pin and the gravity center position of the bucket.

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