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Active suspension system for a work vehicle having adjustable performance parameters

  • US 6,000,703 A
  • Filed: 11/12/1997
  • Issued: 12/14/1999
  • Est. Priority Date: 11/12/1997
  • Status: Expired due to Term
First Claim
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1. In an off-road work vehicle including a chassis, a propulsion system coupled to the chassis to propel the work vehicle along a surface in a forward direction, an operator'"'"'s cab supported by the chassis, and an active suspension system including at least one active vibration isolator coupled between the chassis and the cab, each active vibration isolator including a hydraulic actuator disposed to move the cab relative to the chassis based upon fluid selectively applied to the actuator by a valve assembly in response to a control signal, a method of controlling the active suspension system comprising the steps of:

  • sensing movement of the cab due to disturbances in the chassis and generating a first parameter indicative of the sensed movement;

    detecting a condition of the surface ahead of the work vehicle in the forward direction and generating a second parameter indicative of the condition;

    providing the first and second parameters as inputs to a processing circuit configured to execute a predetermined control program having at least one adjustable performance parameter which depends upon the second parameter, the at least one adjustable performance parameter being selected from the group consisting of gain of the suspension system and frequency response of the suspension system;

    generating the control signal for the valve assembly to attenuate transmission of force between the cab and the chassis by executing the control program, the control signal depending upon both the first and second parameters; and

    applying the control signal to the valve assembly, whereby performance of the suspension system depends on the detected condition of the surface.

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