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Engine exhaust temperature control method and system

A control method and control system technology, applied in the field of engine exhaust temperature control method and system, can solve the problems of low temperature, low exhaust gas treatment efficiency, low conversion efficiency of NO and NH3, etc., and achieve the effect of improving efficiency

Active Publication Date: 2016-08-24
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature is too low, the exhaust gas treatment efficiency is low or exhaust gas treatment cannot be performed
For example, in the SCR (Selective Catalytic Reduction, selective catalytic reduction) system, when the temperature of the exhaust gas upstream of the SCR is lower than 200°C, NO and NH 3 conversion efficiency is low

Method used

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  • Engine exhaust temperature control method and system
  • Engine exhaust temperature control method and system
  • Engine exhaust temperature control method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] figure 1It is a structural schematic diagram of the control system of the engine exhaust temperature described in Embodiment 1 of the present invention, combined below figure 1 The control system of the exhaust gas temperature of the engine according to the first embodiment of the present invention is described in detail.

[0046] Such as figure 1 As shown, the control system of the engine exhaust temperature includes an ECU control unit 1, an engine 2, an intercooler 3 and an exhaust gas treatment system 4, wherein the engine 2 includes an intake pipe 21 and an exhaust pipe 22, and the intercooler 3 is connected to The intake pipe 21 of the engine 2 and the engine 2, such that the air in the intake pipe 21 enters the cylinder of the engine 2 after being cooled by the intercooler 3. In order to increase the air intake density and intake air volume, the control system further includes a turbocharger 5 arranged between the intake pipe 21 and the intercooler 3 . In this...

Embodiment 2

[0074] image 3It is a schematic flow chart of the method for controlling the exhaust gas temperature of the engine shown in Embodiment 2 of the present invention. Such as image 3 As shown, the method for controlling the exhaust gas temperature of the engine provided by the embodiment of the present invention includes the following steps:

[0075] S31. The DPF upstream and downstream differential pressure sensor detects the differential pressure between the upstream and downstream of the DPF:

[0076] The upstream and downstream differential pressure sensors of the DPF detect the pressure difference between the upstream and downstream of the DPF.

[0077] S32. The ECU control unit obtains the pressure difference between the upstream and downstream of the DPF detected by the pressure difference sensor between the upstream and downstream of the DPF:

[0078] Utilize the ECU control unit in the control system and each sensor in the control system (including the pressure diffe...

Embodiment 3

[0103] Figure 4 It is a schematic flow chart of the method for controlling the exhaust gas temperature of the engine described in the third embodiment of the present invention. Such as Figure 4 As shown, the method for controlling the exhaust gas temperature of the engine provided by the embodiment of the present invention includes the following steps:

[0104] S41 detects the temperature upstream of the SCR:

[0105] The SCR upstream temperature sensor detects the temperature upstream of the SCR.

[0106] S42. The ECU control unit judges whether the temperature upstream of the SCR is lower than a preset temperature:

[0107] It should be noted that when the vehicle runs in the low-temperature and low-load range for a long time, the exhaust temperature of the engine is low, the SCR catalyst is not working, and the nitrogen and oxygen emissions are high at this time. In order to reduce the emission of nitrogen oxides, the exhaust gas of the engine should be treated by SCR...

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PUM

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Abstract

The invention provides a method and system for controlling the exhaust gas temperature of an engine. The control system comprises an ECU, the engine, an intercooler, a tail gas treatment system, an air inlet pipe which is parallel with the intercooler and used for being connected with the engine, and a bypass pipeline of an air cylinder of the engine, a bypass valve is arranged on the bypass pipeline or a separating port of the intercooler and the bypass pipeline, and the bypass valve is used for controlling the flowing direction of air in the air inlet pipe of the engine; the ECU is used for acquiring the upstream and downstream pressure difference of a DPF and the upstream temperature of a DOC, whether the amount of particulate matter borne in the DPF exceeds a preset threshold value or not is judged according to the acquired upstream and downstream pressure difference of the DPF, if yes, the opening degree of the bypass valve is control according to the acquired upstream temperature of the DOC, the flowing direction of air in the air inlet pipe of the engine is controlled, and therefore the exhaust gas temperature of the engine is controlled.

Description

technical field [0001] The invention relates to the technical field of engine exhaust emissions, in particular to a method and system for controlling the exhaust temperature of an engine. Background technique [0002] In order to reduce the emission of the engine and protect the environment, the exhaust gas discharged from the exhaust pipe of the engine needs to be discharged into the environment through the exhaust gas treatment process of the exhaust gas treatment system. [0003] In the exhaust gas treatment system of the engine machine, the exhaust temperature of the engine plays a vital role in the thoroughness of the exhaust emission treatment of the engine. This is because, in the exhaust gas treatment process of the engine, the exhaust gas treatment system can only process the exhaust gas after the exhaust gas temperature reaches a certain temperature. If the temperature is too low, the exhaust gas treatment efficiency is low or exhaust gas treatment cannot be perfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N9/00
CPCY02T10/40
Inventor 苗垒陶建忠张展腾王东升王意宝唐蛟
Owner WEICHAI POWER CO LTD