Hybrid construction machine and control method of hybrid construction machine

A construction machinery and hybrid technology, which is applied in the control system, control device, control generator, etc., can solve the problems of driver damage, load control deviation, and large voltage value fluctuation of the storage mechanism, so as to suppress the voltage value change , the effect of suppressing deviation

Inactive Publication Date: 2010-12-08
SUMITOMO HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in this type of hybrid construction machine, since power consumption by load such as a motor generator and generation of regenerative power are repeated, the voltage value of the power storage mechanism fluctuates greatly.
[0007] There are problems such as variations in the controllability of the load due to fluctuations in the voltage value of the power storage mechanism, and damage to the driver of the load due to overcurrent.

Method used

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  • Hybrid construction machine and control method of hybrid construction machine
  • Hybrid construction machine and control method of hybrid construction machine
  • Hybrid construction machine and control method of hybrid construction machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0119] figure 1 It is a side view showing construction machines including the hybrid construction machine according to the first embodiment.

[0120] An upper revolving body 3 is mounted on a lower movable body 1 of this hybrid construction machine via a revolving mechanism 2 . In addition, the upper slewing body 3 is equipped with a cab 10 in addition to the boom 4, the rocker arm 5, and the bucket 6, and the boom cylinder 7, the rocker cylinder 8, and the bucket cylinder 9 for hydraulically driving them. and power source.

[0121] [the whole frame]

[0122] figure 2 It is a block diagram showing the configuration of the hybrid construction machine according to the first embodiment. in the figure 2 In the figure, the mechanical power system is represented by double lines, the high-pressure hydraulic lines are represented by thick solid lines, the pilot line is represented by dotted lines, and the electric drive / control system is represented by solid lines.

[0123] An...

Embodiment approach 2

[0184] Figure 4 It is a diagram showing the circuit configuration of the control device used in the buck-boost converter 100 of the hybrid type construction machine according to the second embodiment using control blocks. As shown in the figure, the buck-boost drive control unit 120 of the buck-boost converter 100 includes a voltage control unit 121 , a current control unit 122 , a control switching unit 123 , and a buck-boost switching unit 124 .

[0185] A power connection terminal 104 , an output terminal 106 , a PM (Power Module) 125 for boosting, and a PM 126 for stepping down are connected to the buck-boost drive control unit 120 . These can be achieved image 3 The connection is made in the way of the hardware structure shown. That is, the boost IGBT 102A and the step-down IGBT 102B included in the step-up PM 125 and the step-down PM 126 are PWM driven by the step-up and step-down drive control unit 120, and as a result, the battery voltage Vbat (= vbat_det) and the ...

Embodiment approach 3

[0238] The hybrid type construction machine of Embodiment 3 uses the same boost-boost converter 100 as that of Embodiment 1. As shown in FIG. Therefore, reference in Embodiment 3 image 3 . Embodiment 3 differs from Embodiment 1 in that instead of figure 2 The buck-boost drive control unit 120 according to Embodiment 1 shown uses the drive control unit 200 .

[0239] In the buck-boost converter 100, when the DC bus 110 is boosted, a PWM voltage is applied to the gate terminal of the boost IGBT 102A, and through the diode 102b connected in parallel with the step-down IGBT 102B, the DC bus 110 is switched on and off. On / Off The induced electromotive force generated in the reactor 101 is supplied to the DC bus 110 . Thus, DC bus 110 is boosted.

[0240] Then, when stepping down DC bus 110 , PWM voltage is applied to the gate terminal of step-down IGBT 102B, and regenerative power supplied from inverter 105 is supplied from DC bus 110 to battery 19 via step-down IGBT 102B. A...

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PUM

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Abstract

A hybrid construction machine comprising an internal combustion engine, a motor generator, a working element driven by a hydraulic pressure, and a mechanism driven to turn by a turning motor, is further provided with an electricity accumulation means disposed between the motor generator and the turning motor, wherein the electricity accumulation means comprises a constant voltage electricity accumulation means which maintains a voltage level within a fixed range, and a variable voltage electricity accumulation means which permits variation in voltage level due to motor power generating operation of the motor generator or powering regenerative operation of the turning motor.

Description

[0001] This application claims priority based on Japanese Patent Application No. 2007-334350 for which it applied on December 26, 2007, and uses the entire content of Japanese Patent Application No. 2007-334350 for this international application. technical field [0002] The present invention relates to a hybrid construction machine and a control method for the hybrid construction machine. A buck-boost converter is used. The buck-boost converter has a switching element for boosting and a switching element for bucking, and controls the load. Control of power supply and control of supply of regenerative power obtained from loads to storage devices. Background technique [0003] Conventionally, a hybrid construction machine in which a part of the drive mechanism is electrified has been proposed. This type of construction machine has a hydraulic pump that hydraulically drives operating elements such as a boom, an arm, and a bucket. The engine is driven by a motor generator that...

Claims

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Application Information

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IPC IPC(8): E02F9/20B60K6/28B60K6/46E02F9/00H02M3/155H02P9/04
CPCY02T10/6217B60L3/0023E02F9/2217B60W2510/244E02F9/2025B60K6/365Y02T10/7005B60L11/18B60W20/00E02F9/2075B60Y2200/41Y02T10/70B60K6/46B60K1/02B60W10/26Y02T10/7077B60L11/123B60W10/08E02F9/123E02F9/2091E02F9/2246B60L50/61B60L50/60Y02T10/62B60W2050/001B60W10/06B60W20/13Y02T10/7072
Inventor 庄野博三神林英明
Owner SUMITOMO HEAVY IND LTD
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