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Construction machine and industrial vehicle provided with power supply system

A technology for power supply systems and construction machinery, applied in electric braking systems, motors, buildings, etc., can solve the problems of regenerative energy loss, inability to recycle, lead-acid batteries not suitable for fast charging, etc., and achieve the effect of efficient recycling and reduced capacity

Active Publication Date: 2012-01-18
HITACHI CONSTRUCTION MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, even if a large-capacity battery is installed, when a lead-acid battery is used as the installed battery, most of the regenerative energy during regeneration control may be lost and cannot be recovered because the lead-acid battery is not suitable for rapid charging.

Method used

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  • Construction machine and industrial vehicle provided with power supply system
  • Construction machine and industrial vehicle provided with power supply system
  • Construction machine and industrial vehicle provided with power supply system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0036] figure 1 It is a figure for demonstrating the hybrid hydraulic excavator equipped with the power supply system which concerns on 1st Embodiment.

[0037] exist figure 1 The medium hydraulic excavator has a traveling body 401 and a revolving body 402 , and the traveling body 401 is driven by a hydraulic motor 33 for traveling. In addition, a cab 403 is provided on the left side of the front part of the revolving body 402, and a multi-joint structure including a boom 405, an arm 406, and a bucket 407 is provided on the right side of the front part. Working device 400 .

[0038] The arm 405 , boom 406 , and bucket 407 are driven by an arm cylinder 32 a , boom cylinder 32 b , and bucket cylinder 32 c as hydraulic actuators, respectively.

[0039] figure 2 yes means figure 1 It is a schematic diagram showing the configuration of the drive unit of the hybrid hydraulic excavator shown and the configuration of the power supply system 1 according to the first embodiment mo...

Embodiment approach 2

[0097] The second embodiment will be described below.

[0098] Image 6 It is a figure for demonstrating the forklift equipped with the power supply system which concerns on 2nd Embodiment.

[0099] Figure 7 is for illustration figure 1 Shown are details of the power supply system 1 and a diagram of the control system in the forklift. Figure 7 Among them, the power supply system 1 includes a battery 12 and a capacitor 13 . The battery 12 is a lead storage battery or a lithium ion battery, and it is assumed here that it is a lead storage battery with a voltage of 48V. The capacitor 13 can be made of an electric double layer capacitor or the like, and has a capacity of tens of F.

[0100] A current of about 150 A usually flows through the converter 4 , and sometimes 300 A to 400 A flows when the load is large. When a lead storage battery is used as the battery 12, a capacity of about 400 Ah is required, although it depends on the workload of the forklift and the working ...

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PUM

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Abstract

Regenerative energy is recovered with high efficiency, and the voltage of a battery or a capacitor is optimally controlled. A construction machine or an industrial vehicle provided with a power supply system which comprises a chargeable / dischargeable capacitor and a feeder circuit for connecting a chargeable / dischargeable battery, the capacitor, and a load capable of power running and regeneration, and which feeds the energy accumulated in the capacitor to the load via an inverter and charges the regenerative energy of the load to the capacitor via the inverter, wherein the load is an electric motor, and the capacitor is connected to the load via a DC / DC converter, the DC / DC converter being equipped with a control means for controlling the energy charged / discharged by the capacitor via the DC / DC converter, and wherein the control means is equipped with a power running / regenerative operation estimating means for estimating an operation pattern including the change point of the power running / regeneration of the motor on the basis of the rotational speed and torque of the motor, the DC current supplied to the inverter, or control lever information, and operation pattern information including the change point of power running / regeneration in an iterative process, which has been previously held, and a capacitor target voltage calculating means for controlling the output command value of the DC / DC converter in such a manner that the target voltage of the capacitor is gradually lowered in the case of the power running and is gradually lowered in the case of the regeneration on the basis of the change point and operation pattern estimated by the power running / regenerative operation estimating means.

Description

technical field [0001] The present invention relates to a construction machine and an industrial vehicle equipped with a power supply system, for example, relates to a construction machine and an industrial vehicle equipped with a power supply system suitable for a hydraulic excavator, a forklift, and the like. Background technique [0002] A hybrid car, an electric car, or a battery forklift using a motor as a drive system of a vehicle includes a battery to drive a motor for traveling, and supplies AC power to the motor from the battery via an inverter. [0003] Lead-acid batteries are used as power sources in industrial vehicles such as battery forklifts. However, in consideration of the energy consumed by such industrial vehicles when running or working, it is necessary to increase the capacity of the batteries. [0004] In addition, even if a large-capacity battery is mounted, when a lead-acid battery is used as the mounted battery, most of the regenerative energy during...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/20B60L11/18H02J7/00
CPCH02J7/345B60L1/20B60L1/00B60L7/16Y02T10/7022B60L2200/42B60L2200/40B60L11/005E02F9/2091H02P3/14E02F9/2075B66F9/24Y02P90/60B60L1/003B60L2210/10B60L2240/547B60L2240/549B60L50/40Y02T10/64Y02T10/70Y02T10/72
Inventor 泉枝穗金子悟伊君高志正野信夫
Owner HITACHI CONSTRUCTION MACHINERY CO LTD
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