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Process for automatically controlling actuators of excavator

  • US 5,308,219 A
  • Filed: 09/23/1991
  • Issued: 05/03/1994
  • Est. Priority Date: 09/29/1990
  • Status: Expired due to Fees
First Claim
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1. A process for automatically controlling an apparatus for operating an excavator, said apparatus including a pair of adjustable volume hydraulic pumps with swash plates and swash plate control valves, an engine operably connected to the hydraulic pumps, a plurality of actuators operably connected to said hydraulic pumps, directional control valves operably connected to the pumps and actuators, and control levers and control pedals for generating electric control signals to control the actuators, the process comprising the steps of:

  • determining displacement values for said actuators to be actuated in response to electric control signals received from the control levers and control pedals for controlling said actuators;

    determining a quantity of hydraulic fluid under pressure to be delivered from said hydraulic pumps to said actuators;

    determining values representing the desired position of the directional control valves in order to cause the determined quantity of hydraulic fluid under pressure to be efficiently supplied to said actuators; and

    limiting the output volume of said hydraulic pumps in accordance with the determined quantity of the hydraulic fluid to be supplied to said actuators and in accordance with the determined values of said directional control valves by outputting electric signals representing the limited pump output volumes of said hydraulic pumps to the swash plate control valves by way of an amplifier so as to control inclination angles of swash plates on said hydraulic pumps and in turn control the pump output volumes.

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