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: 2010-03-24
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is a concern that it will take time to travel to the place where the reducing agent is repleni...

Method used

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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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Abstract

To provide a construction machine which can attain required operation with no trouble even when a residual quantity of a reducing agent is decreased. [MEANS FOR SOLVING PROBLEMS] A hydraulic shovel composed of an engine, a plurality of actuators including a hydraulic cylinder (18) and a hydraulic motor (20), and an exhaust gas processing unit for purifying nitrogen oxides in exhaust gas from the engine is provided. It includes an actuator operation control means which performs both of the regulation control for regulating operation of the hydraulic cylinder (18) such that a front working machine driven through the hydraulic cylinder (18) becomes difficult to excert its function when the residual quantity of a reducing agent in a reducing agent storage tank (30) detected by a reducing agent residual quantity detector (33) is below a predetermined level, and the sustention control for sustaining operation of the hydraulic motor (20) so that the function of a traveling body (1) and a turning body (3) driven through 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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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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