System for automatically controlling quantity of hydraulic fluid

Details System for automatically controlling quantity of hydraulic fluid System for automatically controlling quantity of hydraulic fluid

1991-11-14

1995-07-18

Teska, Kevin J.

Boots, shoes, and leggings

37902, 340684, 414687, G06F 1700, E02F 328

Patent

active

054347858

ABSTRACT:
A control system for controlling quantity of hydraulic fluid of an excavator. The control system of this invention provides a method for controlling the quantity of the hydraulic fluid supplied to the swing motor in which in case of swinging operation for driving the swing motor in order to turn the upper frame with respect to the lower frame, the first hydraulic pump is automatically controlled by the controller in order to optimally output hydraulic fluid to timely correspond to starting of the practical swinging operation of the swing motor. The control system of this invention provides another control method for controlling the main pumps in order to output minimum quantity of fluid flow in case of sensing an abnormal operational speed, a speed not exceeding 1/2, speed of the minimum operational speed of the actuator occurring when the actuator is supplied with the minimum quantity of the hydraulic fluid from the main hydraulic pumps, occurring on the actuators due to an overload, but output a normal quantity of fluid flow in order to allow the actuators to be normally operated in case sensing a returnable speed, a speed exceeding 3/4 speed of the minimum operational speed.

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patent: 4844685 (1989-07-01), Sagaser
patent: 4866641 (1989-09-01), Nielsen et al.
patent: 5065326 (1991-11-01), Sahm

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