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Apparatus and method for controlling actuators of hydraulic construction equipment

  • US 5,845,223 A
  • Filed: 10/08/1997
  • Issued: 12/01/1998
  • Est. Priority Date: 07/02/1993
  • Status: Expired due to Fees
First Claim
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1. A method for controlling actuators of hydraulic construction equipment, said actuators supplied with oil from pumps through electrically controllable proportion valves, each pump defined as having left and right hand sides, said method comprising the steps of:

  • (1) calculating a necessary discharge oil amount required for the moving of said actuators according to a first reference input signal for controlling an oil amount of said pumps, a second reference input signal for controlling a moving speed of said actuators, and maximum dischargeable oil amount signal of said pumps;

    (2) determining a required discharge oil amount for the left-hand side of the pump according to a comparison between a sum of a necessary oil amounts required for the moving of the actuators corresponding to the left-hand side of the pump and a maximum dischargeable oil amount of the left-hand side of the pump;

    (3) determining a required discharge oil amount f or the right-hand side of the pump according to a comparison between a sum of a necessary oil amounts required for the moving of the actuators corresponding to the right-hand side of the pump and a maximum dischargeable oil amount of the right-hand side of the pump;

    (4) generating a third reference input signal for controlling the oil amount of said pumps and a fourth reference input signal for controlling the moving speed of said actuators according to said required discharge oil amounts of said second and third steps; and

    (5) controlling the oil amount of said pumps and the moving speed of said actuators by means of the third and fourth reference input signals generated in said fourth step being applied to said proportion valves.

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