Overload prevention device for construction machine

A construction machinery, anti-overload technology, applied in the direction of construction, mechanical equipment, control devices, etc., can solve the problems of increased fuel consumption, achieve the effects of reducing fuel consumption, improving operability, and eliminating engine loading and deceleration

Active Publication Date: 2009-05-13
SUMITOMO CONSTRUCTION MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the fuel injection quantity q of engine 1 is increased from q1 to q2, the same as Figure 9 The fuel injection amount corresponding to the shaded portion F shown in (g) becomes the cause of increased fuel consumption of the engine 1

Method used

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  • Overload prevention device for construction machine
  • Overload prevention device for construction machine
  • Overload prevention device for construction machine

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0035] Hereinafter, an overload prevention device for a construction machine according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0036] FIG. 1 is a diagram showing a hydraulic circuit of an overload prevention device for a construction machine according to an embodiment of the present invention. figure 2 It is a torque characteristic diagram showing the relationship between the secondary pressure of the electromagnetic inverse proportional valve and the pump input torque of the embodiment shown in FIG. 1 . image 3 It is a timing chart showing each characteristic in the embodiment of FIG. 1 . In addition, in FIG. 1, the same components as those shown in FIG. 7 are marked with the same reference numerals, and redundant explanations are omitted.

[0037] As described above, in order to prevent engine load deceleration when the discharge pressure of the hydraulic pump rises rapidly and to prevent the fuel injectio...

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PUM

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Abstract

An overload prevention device for a construction machine, preventing occurrence of engine lag down in a sharp rise of discharge pressure of a hydraulic pump to prevent the amount of fuel injection of an internal combustion engine from increasing sharply, thereby reducing fuel consumption in the entire work of the construction machine and improving operability of a hydraulic actuator etc. The overload prevention device has operating condition detection means and control means. The operating condition detection means detects operating conditions of an operation lever. When the control means determines, based on the operating conditions detected by the operating condition detection means, that the lever is operated at a speed higher than a predetermined speed, the control means outputs to discharge amount control means a control signal for setting input torque of a hydraulic pump at a minimum torque value in constant-torque control, and after that, the control means changes the level of the control signal according to a predetermined control pattern to increase the input torque of the hydraulic pump to a maximum torque value in the constant-torque control.

Description

technical field [0001] The present invention relates to an anti-overload device for a construction machine, and in particular to an anti-overload device for a construction machine capable of reducing fuel consumption during various operations in construction machines such as a hydraulic shovel using an internal combustion engine as a drive system. Background technique [0002] An existing anti-overload device for construction machinery is, for example, the hydraulic pump-driven control device shown in FIG. 7 . [0003] In the hydraulic pump-driven control device shown in FIG. 7 , a variable displacement hydraulic pump (main pump) 2 and a pilot pump 3 driven by an engine (internal combustion engine) 1 are provided. The discharge port of the variable displacement hydraulic pump 2 faces an unillustrated hydraulic actuator and communicates with a control valve 4 for controlling supply and discharge of hydraulic pressure from the variable displacement hydraulic pump 2 . [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/00F02D29/00E02F9/22F02D29/04
CPCE02F9/2285F15B2211/6316E02F9/2235F15B2211/20553E02F9/2228F15B2211/6346F15B2211/20523E02F9/226F15B2211/633F02D29/04E02F9/2296F15B2211/26B60K17/00E02F9/22F02D29/00F15B11/00
Inventor 塚本浩之西贵志
Owner SUMITOMO CONSTRUCTION MACHINERY
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