×

Method and device for controlling construction machine

  • US 6,108,948 A
  • Filed: 11/10/1998
  • Issued: 08/29/2000
  • Est. Priority Date: 03/10/1997
  • Status: Expired due to Fees
First Claim
Patent Images

1. A control method for a construction machine including (i) a joint type arm mechanism, (ii) a cylinder type actuator being operatively connected to a hydraulic circuit to drive the joint type arm mechanism, and (iii) a pump disposed in the hydraulic circuit and operable to vary delivery pressure in response to a request of an operator via an operation member, the cylinder type actuator being operable to actuate the joint type arm machine and driven by using the delivery pressure of the pump, said method comprising:

  • (a) detecting whether the operation member is set at a neutral position in which a driving force of the pump is no longer transmitted to the cylinder type actuator;

    (b) triggering, in response to a request, of the operator, a control signal to vary the delivery pressure of the pump;

    (c) monitoring a current value of loading at the cylinder type actuator; and

    (d) maintaining, if the operation member is set in said neutral position as the result of said detecting and in respond to said triggering, the delivery pressure of the pump at a level equal to or higher than at least one reference pressure value selected from various reference pressure values, in accordance with said monitored value of loading at the cylinder type actuator.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×