Construction machine

A technology of construction machinery and engines, which is applied in construction, mechanical equipment, engine components, etc., and can solve problems such as time spent on driving

Active Publication Date: 2013-01-02
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a concern that it will take time to travel to the place where the reducing agent is replenished, and it is an obstacle to quickly perform necessary actions such as running and turning for emergency avoidance.

Method used

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Experimental program
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Embodiment Construction

[0023] Hereinafter, the best mode for implementing the construction machine of the present invention will be described based on the drawings.

[0024] figure 1 It is a side view showing a hydraulic excavator as an embodiment of the construction machine of the present invention, figure 2 is a diagram showing a drive circuit and an exhaust gas treatment device included in the present embodiment, image 3 It is a flowchart showing the main part of the processing executed by the controller included in the drive circuit included in the present embodiment.

[0025] This embodiment is as figure 1 As shown, it includes: a traveling body 1 having crawlers driven by a traveling driver such as a traveling motor 2; A cab 4 is provided on the front side of the revolving body 3 , an engine compartment 5 for accommodating an engine 6 is provided behind the cab 4 , and a counterweight 7 for ensuring weight balance is provided at the rear end.

[0026] In front of the rotating body 5, the...

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PUM

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Abstract

[PROBLEM] To provide a construction machine capable of performing necessary operation or operations without a difficulty even when a remaining amount of a reducing agent becomes small. [SOLUTION] In a hydraulic excavator having an engine, a hydraulic cylinder (18), plural actuators including a hydraulic motor (29), and an exhaust gas treatment system for subjecting, to purification treatment, nitrogen oxides in exhaust gas from the engine, the hydraulic excavator is provided with an actuator operation control means for performing, when the remaining amount of the reducing agent in a reducing agent storage tank (30) is detected by a remaining reducing-agent amount detector (33) to have become equal to or smaller than a predetermined remaining amount, limiting control to limit an operation of the hydraulic cylinder (18) such that a front working implement driven by the hydraulic cylinder (18) becomes difficult to exhibit its function, and at a same time, holding control for holding the hydraulic motor (20) operable such that a function of a travel base (1) or swing upperstructure (3) driven by the hydraulic motor (20) can be exhibited.

Description

technical field [0001] The present invention relates to a construction machine such as a hydraulic excavator equipped with an exhaust gas treatment device having a reduction catalyst for reducing NOx in engine exhaust gas. Background technique [0002] Recently, with the application of high-order exhaust gas regulations to diesel engines, it is necessary to mount exhaust gas treatment devices other than exhaust mufflers on the body in which the engine is disposed. Examples of the exhaust gas treatment device described above include a particulate matter trap filter, a urea selective reduction NOx treatment device, a NOx catalyst, and the like. Such NOx reduction uses a liquid reducing agent, which is an aqueous urea solution, but is a urea selective reduction NOx treatment device. [0003] As such a prior art, there is a technique disclosed in Patent Document 1. Such a prior art exhaust treatment device includes an oxidation catalyst, a NOx storage catalyst, and a selective...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02F9/22B01D53/56B01D53/74F01N3/08
CPCE02F9/00E02F9/0808E02F9/2203Y02T10/24E02F9/2246F01N3/2066F01N2900/1814B01D2251/2067F01N2610/02Y02T10/12B01D53/56B01D53/74E02F9/22F01N3/08
Inventor 神谷象平中村和则荒井康
Owner NIHON KENKI CO LTD
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