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Engine control device for construction machine

一种建筑机械、控制装置的技术，应用在发动机控制、机器/发动机、流体压力致动装置等方向，能够解决转速上升、超过耐久性能、不能控制发动机转速等问题

Active Publication Date: 2008-08-13
HITACHI CONSTRUCTION MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase in fuel can not control the engine speed, it may cause the speed to rise higher than the required speed, and sometimes it will exceed the speed of durability.

Method used

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  • Engine control device for construction machine
  • Engine control device for construction machine
  • Engine control device for construction machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] Embodiments of the present invention will be described below with reference to the drawings, and the following embodiments are examples in which the present invention is applied to an engine control device for a hydraulic excavator.

[0030] First, a first embodiment of the present invention will be described with reference to FIGS. 1 to 8 .

[0031] In Fig. 1, 1 and 2 are variable hydraulic pumps such as swash plate type, and 9 is a quantitative hydraulic control pump. Drive rotation.

[0032] The valve device 5 shown in FIG. 2 is connected to the output channels 3 and 4 of the hydraulic pumps 1 and 2, and the pressure oil is sent to the hydraulic actuators 50-56 through the valve device 5 to drive these hydraulic actuators. A hydraulically controlled overflow valve 9b for keeping the output pressure of the hydraulically controlled pump 9 constant is connected to the output path 9a of the hydraulically controlled pump 9 .

[0033] The valve device 5 will be described...

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PUM

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Abstract

An engine control system includes pressure sensors (73, 74), position sensors (75, 76), a target revolution speed modification value computing unit (90), and a modification value adder (70r). A target revolution speed NR2 for use in control is computed based on changes of status variables such that the target revolution speed NR2 increases from the target revolution speed NR1 applied from an input unit (71), and then moderately returns to the target revolution speed NR1. In accordance with the computed target revolution speed NR2 for use in control, a target fuel injection amount FN1 is computed and a fuel injection amount is controlled. As a result, a drop of an engine revolution speed attributable to an abrupt increase of an engine load can be suppressed without sacrificing the work efficiency, and lowering of durability caused by an excessive increase of the engine revolution speed can be prevented.

Description

technical field [0001] The present invention relates to an engine control device for a construction machine, in particular to an engine control device for a construction machine in which a variable capacity hydraulic pump is driven by a diesel engine and a hydraulic actuator is driven. Background technique [0002] Engineering and construction machinery such as hydraulic excavators generally have: an engine, at least one variable hydraulic pump driven by the engine, multiple hydraulic actuators driven by the output oil from the hydraulic pump, and control from the hydraulic pump to multiple hydraulic actuators. A plurality of flow control valves that supply the flow of pressure oil to the actuator, and a plurality of operating lever devices that operate the operating mechanism of the plurality of flow control valves. The engine that drives the hydraulic pump is a diesel engine, and a fuel injection device called a governor controls the amount of fuel injected to control the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/04F02D41/14E02F9/22F02D29/00F02D29/04F02D31/00F02D41/12F02D45/00F15B11/00
CPCF02D41/12F02D31/007F02D41/04F15B11/00
Inventor 中村和则荒井康古渡阳一石川广二柄泽英男
Owner HITACHI CONSTRUCTION MACHINERY CO LTD