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Construction machinery

  • US 7,143,859 B2
  • Filed: 09/10/2003
  • Issued: 12/05/2006
  • Est. Priority Date: 09/11/2002
  • Status: Expired due to Fees
First Claim
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1. Construction machinery comprising:

  • an engine.a hydraulic pump driven by the engine; and

    an actuator driven by oil pressure supplied from the hydraulic pump;

    whereinin a case of a load mode where an engine torque at an intersection point of an iso-horsepower curve of a necessary horsepower and a governor characteristic curve of the engine is less than that of a rated output point of the engine, the number of revolutions of the engine is reduced and the engine torque is increased with reference to the intersection point, and the engine is allowed to run with a horsepower exceeding the iso-horsepower, and with use of a surplus torque generated therefrom, a power generator is operated so as to generate an electric power, which is accumulated in a power accumulation apparatus.

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