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Hybrid construction machine

By using a charge rate detector and a control unit to adjust the auxiliary power in a hybrid excavator, the problem of overcharging of the power storage device is solved, the life of the equipment is extended, and the energy saving effect is achieved.

Inactive Publication Date: 2015-01-21
KOBELCO CONSTR MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solution, especially in excavators with severe space constraints, makes the layout of the equipment difficult and leads to higher costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] Embodiments of the present invention will be described below with reference to the drawings. In addition, the following embodiments apply the present invention to Figure 5 As an example of a hybrid excavator, a case where a slewing motor is provided as an electric actuator serving as a slewing power source is taken as an example.

[0018] The hybrid excavator in this embodiment includes: figure 1 Shown are an engine 10 ; a generator engine 11 ; a hydraulic pump 12 ; a control valve 13 ; a hydraulic actuator 14 ;

[0019] The engine 10 is a power source of the generator engine 11 and the hydraulic pump 12 . The above-mentioned generator engine 11 performs a generator function and a motor function. The hydraulic pump 12 is a hydraulic pressure source for the hydraulic actuator 14 . The generator engine 11 and the hydraulic pump 12 are connected to the engine 10 and driven by the engine 10 .

[0020] The aforementioned hydraulic actuator 14 representatively represent...

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PUM

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Abstract

Provided is a hybrid construction machine preventing an electrical storage device from overcharge, including a hydraulic actuator, a hydraulic pump, a generator-motor which performs electric generator and motor actions, an engine, an electric actuator which generates regenerative electric power, an electrical storage device which performs a charge-and-discharge action with the generator-motor and the electric actuator, a charge-rate detector which detects a charge rate C1 of the electrical storage device, and a control section which controls an operation of the generator-motor and a charge-and-discharge action of the electrical storage device. The control section, when the charge rate C1 exceeds a set value Cs, performs overcharge-prevention control of making assist power by the electric motor action of the generator-motor be greater than that when C1 ‰¤ Cs, the set value Cs predetermined as a charge rate at which receiving the regenerative electric power can overcharge the electrical storage device.

Description

technical field [0001] The invention relates to a hybrid construction machine which uses both engine power and power storage device power. Background technique [0002] by Figure 5 Take the excavator as an example to illustrate the background technology of the present invention. [0003] The above-mentioned excavator includes: a crawler-type lower walking body 1; an upper rotating body 2 installed on the crawler-type lower walking body 1 freely rotatable around an axis X perpendicular to the ground; front appendage 3; and the engine. [0004] The above-mentioned front attachment 3 has: a boom 4 that can rise and fall freely; an arm 5 installed at the front end of the boom 4; a bucket 6 installed at the front end of the arm 5; and a plurality of hydraulic actuators for driving the above components. Devices, namely the boom cylinder 7, the arm cylinder 8 and the bucket cylinder 9. [0005] In addition, the hybrid excavator described in Japanese Patent Laid-Open Publication...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/20E02F9/22B60L50/15
CPCE02F9/2091E02F9/2075Y10S903/907B60K6/46B60L1/20B60W10/08B60W10/26B60W2510/244F15B21/14F15B2211/20515F15B2211/20523F15B2211/20569F15B2211/88B60L1/003B60L2240/441B60L2240/545B60W20/13Y02T10/70B60L50/16B60L58/25B60L58/15Y02T10/62Y02T10/7072
Owner KOBELCO CONSTR MASCH CO LTD
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