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Hybrid work machine

A kind of operation machinery and hybrid power technology, which is applied to hybrid vehicles, mechanical equipment, power devices, etc., can solve the problem of not being able to choose the timing of charging, and achieve good fuel efficiency

Active Publication Date: 2015-10-28
HITACHI CONSTRUCTION MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the specific operation of the charging and utilization work performed by the recovery of mechanical energy, the timing of charging cannot be selected. However, as long as there is a surplus of engine power, charging can be performed at any time by using the power generation of the auxiliary motor of the engine.

Method used

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Examples

Experimental program
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Embodiment Construction

[0024] Embodiments of the present invention will be described below using the drawings.

[0025] figure 1 It is an external view of a hybrid hydraulic excavator according to an embodiment of the present invention. The hydraulic excavator shown in this figure includes a articulated front working device 1A including a boom 1a, an arm 1b, and a bucket 1c, and a vehicle body 1B including an upper revolving body 1d and a lower traveling body 1e.

[0026] The boom 1a is rotatably supported by the upper swing body 1d, and is driven by a hydraulic cylinder (boom cylinder) 3a. The arm 1b is rotatably supported by the boom 1a, and is driven by a hydraulic cylinder (arm cylinder) 3b. The bucket 1c is rotatably supported by the arm 1b, and is driven by a hydraulic cylinder (bucket cylinder) 3c. The upper rotating body 1d is powered by an electric motor (rotating motor) 16 (refer to figure 2 ) is driven to rotate, and the lower traveling body 1e is driven by left and right hydraulic m...

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PUM

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Abstract

A hybrid work machine comprises: an engine controller (14) that controls the speed of an engine (7) on the basis of a target speed input with an EC dial (31); an assist power generator (10) that generates electric power by using the power of the engine (7); a hydraulic pump (6) that operates by using the power of the engine and / or the assist power generator; and a vehicle controller (11) that estimates the power (Pe) to be demanded from the engine when outputting power generation demands to the assist power generator and that allows power generation by the assist power generator only when the engine demand power is at or below a power generation threshold (Eth1). The power generation threshold (Eth1) is determined on the basis of the power of the engine (7) and energy loss characteristics.

Description

technical field [0001] The present invention relates to a hybrid working machine that uses an engine and an electric motor as drive sources of a hydraulic pump. Background technique [0002] A hybrid hydraulic excavator as an example of a hybrid operating machine includes a hydraulic excavator in which a hydraulic pump is driven by both an engine and an electric motor (auxiliary motor) during heavy-duty operations such as excavation work. The electric motor is driven by discharging the battery to assist the engine. On the other hand, when the upper revolving body is decelerated or the boom is lowered, its mechanical energy is used to generate electricity for the generator motor, and the electric energy is used to charge the battery. [0003] In the operation based on the hybrid hydraulic excavator, although the battery is repeatedly discharged and charged in the above-mentioned way, it is difficult to make up all the energy released by the auxiliary motor during the operatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/20B60W10/08B60W20/00
CPCB60W10/08B60K6/485B60W20/00B60W2510/0666E02F9/2075E02F9/2246E02F9/2296F02D29/04Y02T10/62F15B11/08F15B15/088F15B2211/20515F15B2211/20523
Inventor 星野雅俊石原新士山冈士朗
Owner HITACHI CONSTRUCTION MACHINERY CO LTD
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