Pump torque control device for hydraulic construction machine

A technology for hydraulic engineering machinery and torque control, applied in pump control, liquid variable capacity machinery, fluid pressure actuating devices, etc., can solve problems such as reduction, and achieve the effect of preventing stalling and increasing the instantaneous reduction of rotational speed.

Active Publication Date: 2009-10-28
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the temperature of the working oil that is not directly related to the reduction in the output of the prime mover is n

Method used

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  • Pump torque control device for hydraulic construction machine
  • Pump torque control device for hydraulic construction machine
  • Pump torque control device for hydraulic construction machine

Examples

Experimental program
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Embodiment Construction

[0076] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0077] figure 1 It is a diagram showing the overall configuration of a construction machine hydraulic system including a pump torque control device according to a first embodiment of the present invention. As a construction machine, this embodiment is aimed at a hydraulic excavator.

[0078] exist figure 1 In this embodiment, the construction machinery hydraulic system includes a prime mover 1 , two main pumps, namely a variable capacity first hydraulic pump 2 and a second hydraulic pump 3 driven by the prime mover 1 , and two main pumps driven by the prime mover 1 . fixed-capacity pilot pump 5, control valve unit 6 connected to the first and second hydraulic pumps 2, 3, and multiple hydraulic actuators 7, 8, 9, 10 connected to the control valve unit 6, 11, 12.

[0079] The prime mover 1 is a diesel engine 1 , and the diesel engine (hereinafter simply referred to as...

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PUM

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Abstract

A pump torque control system is capable of preventing from hunting due to interference between speed sensing control and control on an engine speed of a prime mover when the temperature of a hydraulic fluid is low, and performing appropriate pump torque control. A regulator 31 controls displacement volumes of hydraulic pumps 2 and 3 to ensure that the total absorption torque of the hydraulic pumps 2 and 3 does not exceed a set maximum absorption torque. An engine sensor 33, a hydraulic fluid temperature sensor 34, a solenoid proportional valve 35, and a controller 23 perform the speed sensing control to ensure that the maximum absorption torque of the hydraulic pumps 2 and 3 is reduced. The maximum absorption torque is set in the regulator 31 based on a deviation between a target engine speed of the prime mover 1 and an actual engine speed of the prime mover 1. A second modification factor calculating section 45 and a control gain modifying section 49, which are included in the controller 23, change a control gain of the speed sensing control based on a value detected by the hydraulic temperature sensor 34 to ensure that the control gain is reduced as the temperature of the hydraulic fluid is reduced.

Description

technical field [0001] The present invention relates to a pump torque control device for a hydraulic construction machine, and more particularly to a hydraulic construction machine such as a hydraulic excavator that drives a hydraulic actuator by hydraulic oil (working oil) discharged from a hydraulic pump rotationally driven by a prime mover to perform required operations pump torque control device. Background technique [0002] Generally, hydraulic engineering machines such as hydraulic excavators are equipped with a pump torque control device that has a pump torque control function added to a regulator that controls the oil discharge volume of the hydraulic pump. The absorption torque of the pump does not exceed the preset maximum absorption torque, thereby suppressing the overload of the prime mover and preventing the engine from stalling. [0003] Regarding such a pump torque control device of a hydraulic construction machine, a control method entitled "Control Method ...

Claims

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Application Information

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IPC IPC(8): E02F9/22E02F9/20F04B49/06F15B11/00
CPCE02F9/2285E02F9/2235F15B2211/20523F15B2211/7058F15B2211/26E02F9/2296F04B17/05F15B2211/20553F15B2211/6652F15B2211/2656F15B11/17F04B49/08F15B2211/7053E02F9/2225E02F9/2282E02F9/2292F15B2211/633F15B2211/6655F15B2211/6309F15B2211/31576F15B2211/329F15B13/0422F15B2211/3116F15B2211/20546F15B2211/6343E02F9/20E02F9/22F04B49/06F15B11/00
Inventor 有贺修荣石川广二柄泽英男冈野康雄中村和则古渡阳一
Owner NIHON KENKI CO LTD
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