Diesel engine tail gas after-treatment system and heating control method

An exhaust gas post-treatment and diesel engine technology, which is applied to the electronic control of exhaust gas treatment devices, exhaust gas treatment, engine components, etc., can solve the problems that the adaptability cannot be balanced, the NOx conversion efficiency cannot be accurately controlled, and the total NO2 Uncertainty, etc.

Inactive Publication Date: 2016-10-12
天津星洁汽车排放控制系统有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The adaptability of the DOC scheme to different working conditions cannot be balanced, and the oxidation produces NO 2 The total amount of uncertain, will lead to NO at low temperature x The conversion efficiency cannot be precisely controlled

Method used

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  • Diesel engine tail gas after-treatment system and heating control method
  • Diesel engine tail gas after-treatment system and heating control method

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Embodiment Construction

[0034] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0035] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention Creation and simplification of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should no...

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Abstract

The invention provides a diesel engine tail gas after-treatment system. The diesel engine tail gas after-treatment system comprises a SCR catalyst, a urea pump, a urea tank, a urea nozzle, a control unit, a temperature sensor and a nitric oxide sensor, and further comprises a waste gas temperature adjusting device for heating control of the temperature of exhausted tail gas; the urea pump is integrated on the urea tank, and is connected with the urea nozzle through a urea solution pipeline; and the urea nozzle is mounted on an exhaust pipe. The diesel engine tail gas after-treatment system is provided with the waste gas temperature adjusting device, and is provided with an internal heating body for heating the tail gas to keep the temperature of the tail gas in a set range so as to always keep the catalytic reaction efficiency on a higher level. The diesel engine tail gas after-treatment system can output different heating powers for different working conditions to realize instant and different active control of the exhaust temperature so as to adapt to the demands on different working condition points through controlling such parameters as the electrifying time and frequency of the heating body.

Description

technical field [0001] The invention belongs to the field of diesel engine control, and in particular relates to a diesel engine exhaust aftertreatment system and a heating control method. Background technique [0002] At present, most commercial vehicles are equipped with diesel engines. Selective Catalytic Reduction (SCR) technology is the mainstream technical route to achieve diesel engine exhaust emissions meeting National V and above regulations. The basic working principle of the SCR system is to spray urea aqueous solution into the engine through the nozzle. In the exhaust pipe, in the catalytic converter for NO in diesel engine exhaust X Decompose to generate N 2 and H 2 O. The SCR system usually includes the main components such as the urea aqueous solution metering supply module, the control unit and the catalytic converter. [0003] However, due to the different activities of SCR catalysts at different temperatures, the catalytic conversion efficiency of NOx i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/28F01N9/00
CPCF01N3/28F01N9/00F01N2390/02F01N2560/026F01N2560/06F01N2610/02F01N2900/1404Y02A50/20Y02T10/40
Inventor 魏罡啜韦伟
Owner 天津星洁汽车排放控制系统有限公司
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