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Working machine

一种作业、机器的技术，应用在机器/发动机、机动车、机械设备等方向，能够解决发动机控制器不能处理等问题，达到降低燃料消耗的效果

Active Publication Date: 2016-06-15
CATEPILLAR SARL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] As noted above, while techniques are known in the art to enable varying engine speed between operation and driving, conventional engine controllers cannot handle power-demanding driving conditions, such as on slopes or during self-steering

Method used

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Embodiment Construction

[0029] In the following, the Figure 1 to Figure 6 The examples shown in the present invention are described in detail.

[0030] In this embodiment, the case where the engine speed is set such that (normal operation mode engine speed)<(light load running mode engine speed)<(heavy load running mode engine speed) is described by way of example. However, it is not necessary to set the engine speed so that the light load running mode engine speed is between the normal operation mode engine speed and the heavy load running mode engine speed. The engine speed may be set such that (light load running mode engine speed)≦(normal operating mode engine speed)<(heavy load running mode engine speed) or (normal operating mode engine speed)<(heavy load running mode engine speed) ≤ (light load driving mode engine speed). However, no description of these situations is provided.

[0031] The engine speed can be set such that when the pump flow rate is prioritized (normal operating mode engin...

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PUM

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Abstract

Provided is a work machine which that includes compatibility of a reduction in fuel during a normal working mode and ensuring a travelling speed and output in severe travelling conditions. A work machine has a work device mounted on a machine body including a fluid pressure motor for travelling, and a controller reduces an engine speed so as to be lower than a rated engine speed during a normal working mode. The controller controls an engine speed so as to obtain a pump flow rate in accordance with a target travelling speed during a travelling low-load mode when an engine load is lower than a threshold. The controller controls both the engine speed and an output torque for pump control so that the engine output becomes maximum during a travelling high-load mode when the engine load is higher than the threshold.

Description

technical field [0001] The invention relates to a work machine with a hydraulic traction motor. Background technique [0002] In recent years, energy saving (reduction of fuel consumption) has become an important issue for work machines. Furthermore, in an excavator, it is necessary to suppress the engine rotation speed as low as possible in an idling mode or in a relatively light-load excavation operation (normal operation). [0003] Here, when it is necessary to ensure running performance, it is impossible to lower only the rated engine speed itself. That is, if the rated engine speed is reduced, the maximum pump flow rate is reduced to reduce travel speed, and the maximum engine output is reduced to reduce travel capability in power demanding conditions such as on slopes. [0004] Therefore, there is a need for a controller capable of reducing engine speed and fixing road speed and road power during normal operating conditions. [0005] From this point of view, due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/22F02D29/04
CPCE02F9/2232F02D29/04B60Y2200/412E02F9/2246E02F3/32E02F9/2066E02F9/2292E02F9/2296F02D41/04F02D2200/50
Inventor 多田彰吾大久保雅史中本洋造
Owner CATEPILLAR SARL
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