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Construction machine

A technology for construction machinery and mechanical connection, applied in mechanical equipment, motors, engine control, etc., can solve problems such as poor fuel consumption efficiency, and achieve the effect of efficient charging and discharging

Active Publication Date: 2013-07-03
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, high-output engines can list environmental problems such as poor fuel efficiency, exhaust, and noise.

Method used

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Embodiment Construction

[0037] use Figure 1 to Figure 6 and Figure 9 A first embodiment of the present invention will be described. In addition, in the following description, the machine efficiency is not considered for the sake of easy understanding, but by controlling the machine efficiency in consideration, more accurate control can be performed.

[0038] figure 1 It is a figure which shows the structure of the hydraulic excavator (representative example of a construction machine) to which this embodiment is applied. figure 1 Among them, the hydraulic excavator 18 has a traveling body 201 and a rotating body 202 .

[0039] The traveling body 201 has a function of driving the construction machine by the traveling hydraulic motor 8 .

[0040] The rotating body 202 is rotated relative to the traveling body 201 by the rotating mechanism 12, and has a boom 203, an arm 204, and a bucket for excavating on the other side (for example, the right side facing forward) of the front portion of the rotati...

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Abstract

The present invention provides a construction machine comprising an engine and capable of using an external power source. The construction machine comprises a power storage device (14) that is charged by using the external power source, the construction machine is assisted by the power storage device when the output power of the engine (1) is insufficient, and also the construction machine efficiently utilizes the power storage device by using the amount of charge of the power storage device in a planned manner based on an operation time period and the controlling the amount of discharge of the power storage device based on load conditions. Specifically, the construction machine comprises: the engine (1); an auxiliary load (16) connected to the engine; an electric assist motor (2) driven by the engine; power converters (9, 10, 13) for converting an AC current output from the electric assist motor into a DC current; and the power storage device (14) connected to the DC side of the power converters, the power storage device being charged by the external power source by way of a charging device (15).

Description

technical field [0001] The present invention relates to a construction machine such as a hydraulic excavator equipped with an engine and an electric storage device. Background technique [0002] Conventionally, a construction machine such as a hydraulic excavator has a hydraulic pump driven by an engine, and the hydraulic pump drives hydraulic working equipment such as a bucket cylinder, an arm cylinder, a boom cylinder, and a traveling hydraulic motor. [0003] In addition, in order to cope with heavy loads during work, construction machines need to fluctuate greatly in engine output, and also need high-output engines that have poorer fuel consumption than low-output engines. [0004] However, the high-output engine can list environmental problems such as poor fuel efficiency, exhaust gas, and noise. [0005] Therefore, in recent years, as a solution to these problems, a hybrid construction machine is proposed, which is equipped with a low-output engine with good fuel cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/20F02D29/02B60L11/14B60L50/16
CPCB60L2200/40E02F9/2075E02F9/2091F02D29/02Y02T90/14B60L1/003B60L2240/423B60L2240/427B60L2240/547B60L2240/80Y02T10/70Y02T10/7072B60L53/14B60L50/16B60L53/00B60L58/13Y02T10/64E02F9/20
Inventor 石田诚司佐佐木正贵梶田勇辅佐竹英敏枝村学藤岛一雄泉枝穗
Owner NIHON KENKI CO LTD
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