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Control method of engine exhaust heating system

A control method and engine technology, applied in engine control, electrical control, machine/engine, etc., can solve problems such as low exhaust gas temperature and failure to meet SCR light-off temperature requirements

Inactive Publication Date: 2019-12-03
FAW JIEFANG AUTOMOTIVE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a control method for an engine exhaust heating system, which can solve the problem in the prior art that the exhaust temperature is too low to meet the SCR light-off temperature requirements and the fuel injection conditions for DPF active regeneration

Method used

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  • Control method of engine exhaust heating system
  • Control method of engine exhaust heating system
  • Control method of engine exhaust heating system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] figure 1 It is a structural schematic diagram of the engine exhaust heating system provided in this embodiment, such as figure 1 As shown, this embodiment provides a control method for an engine exhaust temperature raising system, wherein the engine includes a cylinder group, an exhaust after-treatment device and a control valve group, wherein the cylinder group includes a first cylinder group 1 and a second cylinder group 1 in parallel with it Cylinder group 2, the number of cylinders included in the first cylinder group 1 and the second cylinder group 2 can be 1, 2, 3 or more, including at least two in the first cylinder group 1 or the second cylinder group 2 When using cylinders, at least two cylinders are arranged in parallel. In this embodiment, both the first cylinder group 1 and the second cylinder group 2 include three cylinders.

[0033] The exhaust port in the first cylinder group 1 communicates with the intake port of the exhaust aftertreatment device. Spe...

Embodiment 2

[0074] Figure 4 It is a structural schematic diagram of the engine exhaust heating system provided in this embodiment, such as Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that the control valve group is an adjustable control valve 16, the intake port of the adjustable control valve 16 communicates with the exhaust port of the second cylinder group 2, and the adjustable control valve 16 The two exhaust ports of the second cylinder group 2 are respectively connected with the intake port of the exhaust after-treatment device and the intake port of the cylinder group; The communication opening of the intake port, and the communication opening of the exhaust port of the second cylinder group 2 and the intake port of the cylinder group.

[0075] When the communication opening between the exhaust port of the second cylinder group 2 and the intake port of the cylinder group decreases, the communication opening between the exhaust port of the second...

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Abstract

The invention relates to the field of engines, and discloses a control method of an engine exhaust heating system. According to the invention, the communication opening degree of the exhaust port of the second air cylinder set and the air inlet of the air cylinder set is increased. The amount of air used for EGR circulation in exhaust of the second air cylinder set can be increased. Under the condition that the total air inflow is not changed, the amount of cold air entering the air cylinder set is reduced, the air inlet temperature of the air cylinder set is increased, the exhaust temperatureof the air cylinder set is correspondingly increased, then the air inlet temperature of the exhaust aftertreatment device is increased, and the air inlet temperature of the exhaust aftertreatment device meets the SCR ignition temperature requirement and the DPF active regeneration fuel injection condition.

Description

technical field [0001] The invention relates to the field of engines, in particular to a control method for an engine exhaust temperature raising system. Background technique [0002] Exhaust aftertreatment devices are located in the exhaust pipe downstream of the engine turbine to reduce or remove gases such as nitrogen oxides (NO or NO 2 , collectively referred to as NO x ) and particulate emissions to meet emission regulations. [0003] Existing various types of exhaust after-treatment devices, such as Selective Catalytic Reduction (SCR) are aimed at x A treatment process, that is, under the action of a catalyst, the dosing unit will accurately inject urea that matches the engine operating conditions into the exhaust pipe according to the instructions given by the engine electronic control unit during the post-treatment process In the process, the ammonia and nitrogen oxides produced by the decomposition of urea undergo a catalytic reduction reaction in the SCR catalys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/00F02D9/08F02D41/02
CPCF02D9/08F02D41/0002F02D41/0082F02D41/0085F02D41/0235F02D41/027
Inventor 郭立新李康宁刘婷婷杨海涛
Owner FAW JIEFANG AUTOMOTIVE CO