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HYBRID-TYPE CONSTRUCTION MACHINE

  • US 20130325269A1
  • Filed: 02/27/2012
  • Published: 12/05/2013
  • Est. Priority Date: 03/01/2011
  • Status: Active Grant
First Claim
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1. A hybrid-type construction machine comprising an engine (22), a hydraulic pump (41) driven by said engine (22), a swing structure (20), an electric motor (25) and a hydraulic motor (27) for driving said swing structure (20), a swing control lever (72) operated by an operator to drive said swing structure (20), an electrical storage device (24) for storing electrical energy to be supplied to said electric motor (25), and a controller (80) to which is input a signal reflecting the amount and direction of operation of said swing control lever (72) and which controls charging and discharging of said electrical storage device (24);

  • wherein said controller (80) includes a storage unit which stores a discharge command region to be set in accordance with the swing speed of said swing structure (20) with regard to the amount of stored electricity in said electrical storage device (24), anda computing unit which, if the amount of stored electricity in said electrical storage device (24) reaches said discharge command region stored in said storage unit, computes an additional drive torque command value for increasing the amount of powering of said electric motor (25) in accordance with the amount of stored electricity in said electrical storage device (24), said computing unit further outputting said additional drive torque command value to said electric motor (25) to drive said swing structure (20).

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