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Adaptive fluid motor control

  • US 5,794,442 A
  • Filed: 10/02/1996
  • Issued: 08/18/1998
  • Est. Priority Date: 11/05/1981
  • Status: Expired due to Fees
First Claim
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1. A regenerative adaptive fluid motor output feedback control method comprising the steps of:

  • constructing a fluid motor output feedback control system including fluid motor and load means, spool valve means, fluid power means, and output feedback control means;

    said fluid motor and load means including fluid motor means and motor load means and accumulating a load related energy;

    said spool valve means having at least three fluid power lines including a motor line conducting a motor fluid flow to or a motor fluid flow from said fluid motor means of said fluid motor and load means, a supply power line, and an exhaust power line;

    said fluid power means including a variable delivery fluid power supply generating a pressurized fluid stream being implemented for powering said supply power line of said spool valve means;

    said output feedback control means measuring a motor output of said fluid motor means and producing an output feedback control error signal;

    regulating said motor output of said fluid motor means by said fluid motor output feedback control system by modulating said spool valve means by said output feedback control error signal;

    introducing an exhaust line energy recuperating means for varying a counterpressure rate in said exhaust power line and for recuperating said load related energy of said fluid motor and load means;

    constructing an energy recuperating pressure drop feedback control system including said exhaust line energy recuperating means;

    regulating an exhaust fluid pressure drop across said spool valve means by said energy recuperating pressure drop feedback control system by varying said counterpressure rate in said exhaust power line by said exhaust line energy recuperating means;

    preventing a substantial dynamic operation interference between regulating said exhaust fluid pressure drop and regulating said motor output by providing a significant dynamic performance superiority for said energy recuperating pressure drop feedback control system against said fluid motor output feedback control system by providing either a significant frequency-response superiority or a significant final-transient-time superiority for said energy recuperating pressure drop feedback control system against said fluid motor output feedback control system;

    constructing a load adaptive energy recuperating system including load adaptive energy converting means and energy accumulating means;

    said load adaptive energy converting means including said energy recuperating pressure drop feedback control system;

    providing a load adaptive recuperation of said load related energy of said fluid motor and load means by said load adaptive energy recuperating system by converting said load related energy through said load adaptive energy converting means including said energy recuperating pressure drop feedback control system to a recuperated energy of said energy accumulating means for storing and subsequent use of said recuperated energy;

    facilitating said load adaptive recuperation of said load related energy of said fluid motor and load means by regulating said exhaust fluid pressure drop across said spool valve means by said energy recuperating pressure drop feedback control system;

    constructing a supply line pressure drop feedback control system including said variable delivery fluid power supply;

    regulating a supply fluid pressure drop across said spool valve means by said supply line pressure drop feedback control system by varying a pressure rate of said pressurized fluid stream by a variable delivery means of said variable delivery fluid power supply;

    preventing a substantial dynamic operation interference between regulating said supply fluid pressure drop and regulating said motor output by providing a significant dynamic performance superiority for said supply line pressure drop feedback control system against said fluid motor output feedback control system by providing either a significant frequency-response superiority or a significant final-transient-time superiority for said supply line pressure drop feedback control system against said fluid motor output feedback control system.

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