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Hybrid powered construction equipment

  • US 20030226291A1
  • Filed: 03/13/2003
  • Published: 12/11/2003
  • Est. Priority Date: 06/05/2002
  • Status: Active Grant
First Claim
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1. Hybrid powered construction equipment having an engine;

  • a hydraulic pump powered by the engine;

    hydraulic actuators activated by discharge oil from the hydraulic pump;

    an electric motor working in conjunction with the engine;

    a dynamo electric generator powered by the engine; and

    a battery for storing electric power generated by the dynamo electric generator, the construction equipment further comprising;

    a power-up switch disposed in an operating lever or operation panel; and

    a controller which inputs a signal released from the power-up switch, wherein the controller constantly controls the revolution speed of the engine in response to a signal from the power-up switch and controls the output torque of the electric motor such that torque for assisting powering of the hydraulic pump is output.

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