Maintenance method and device of diesel SCR aftertreatment system

A technology of SCR system and diesel engine, which is applied in the electronic control of exhaust treatment device, diagnostic device of exhaust treatment device, exhaust treatment, etc., and can solve the problems that it is difficult to reach the emission target.

Active Publication Date: 2018-10-23
无锡恒和环保科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the emission regulations become more and more stringent, it will be difficult to achieve the emission target without injecting DEF under the condition of lower exhaust temperature, such as around 200°C

Method used

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  • Maintenance method and device of diesel SCR aftertreatment system
  • Maintenance method and device of diesel SCR aftertreatment system
  • Maintenance method and device of diesel SCR aftertreatment system

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Experimental program
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Embodiment Construction

[0035] exist figure 1 The flow of the invention shown figure 1 In the above, it is assumed that the original ECM of the engine has the function of switching the operating mode through an external command, that is, switching between the normal mode and the burning, cleaning and maintenance mode. External commands can be generated by the diagnostic tool.

[0036] Under normal circumstances, the engine runs in normal mode (step 101). In step 102, the cumulative running mileage and time since the last burning and cleaning maintenance are calculated. According to the vehicle calibration results, there is a preset next maintenance mileage or time interval. In step 103, it is necessary to judge whether the mileage or time calculated in step 102 has reached the preset interval (for example, 20,000 kilometers or 6 months of use), and it is also judged whether the power of the engine is reduced due to excessive exhaust resistance when the engine is running , if the judgment result of ...

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Abstract

The invention relates to a maintenance method of a diesel SCR system. Crystalline substances and organic particulate matter which can be burnt off and probably exist in a diesel exhaust system are removed in the following steps of (1) enabling an engine in a light condition, and entering the operating step of the burning and cleaning mode of the SCR system; (2) starting the engine, and starting the burning and cleaning procedure of the SCR system by a fuel injection device; (3) controlling the engine to operate at preset target rotating speed and preset target exhaust temperature by adjustingthe fuel injection quantity and the fuel injection phase of the back fuel injection pulse of main fuel injection and multi-time fuel injection by an engine fuel injection control system; and (4) exiting the operating step of the burning and cleaning mode of the SCR system. The diesel controller ECM using the method comprises the burning and cleaning maintenance mode, when the diesel is operated under the ECM control of the mode, high-temperature exhaust gas at 400 to 550 DEG C can be generated, and crystalline carbon deposits in the SCR system are burnt and cleaned.

Description

technical field [0001] The invention belongs to the technical field of engine exhaust post-treatment, and in particular relates to the after-sales repair and maintenance of an engine exhaust selective reduction (SCR) post-treatment system. Background technique [0002] With the increasingly prominent environmental problems, energy saving and emission reduction has become an endless requirement for vehicles and engines. For this reason, various countries have issued a series of vehicle emission standards, which are becoming more and more stringent. In this regard, vehicles powered by internal combustion engines need to install exhaust after-treatment systems in order to meet emission requirements. For example, SCR (Selective Catalytic Reduction) technology, which is currently mainly used for catalytic treatment of pollutants such as NOx in diesel engine exhaust, has become a necessary technology for diesel vehicles. [0003] SCR technology needs to quantitatively inject the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N9/00F01N11/00
CPCF01N3/2066F01N9/00F01N11/002F01N2430/00F01N2430/08F01N2260/04Y02T10/12Y02T10/40Y02A50/20
Inventor 杨延相谈秉乾胡亚辉彭劲松李艳
Owner 无锡恒和环保科技有限公司
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