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a no based 2 Control method of tail gas post-treatment system controlled by medium

A technology of exhaust gas post-treatment and control method, which is applied in the direction of electronic control of exhaust gas treatment device, exhaust gas treatment, diagnosis device of exhaust gas treatment device, etc. Simple, scientific control method, easy to achieve effect

Active Publication Date: 2021-10-08
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method takes NO 2 The influence of the proportion of NOx in the chemical reaction, however, is only for the single control of the selective catalytic reduction device SCR, and does not consider the entire exhaust gas after-treatment system level, there are many control variables, and the control accuracy needs to be improved

Method used

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  • a no based <sub>2</sub> Control method of tail gas post-treatment system controlled by medium
  • a no based <sub>2</sub> Control method of tail gas post-treatment system controlled by medium

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Embodiment 1

[0048] A NO-based 2 The control method of the exhaust gas post-treatment system controlled by the medium, such as figure 1 shown, including the following steps:

[0049] S1: Establish a DOC reaction Map to obtain the DOC reaction temperature and NO 2 Generation relationship.

[0050] a1: obtain the reaction temperature of DOC;

[0051] a2: get NO of DOC 2 production volume;

[0052] a3: Record DOC reaction temperature and NO 2 The relationship between the generated quantities;

[0053] a4: Repeat the above steps until the DOC reaction Map is obtained.

[0054] Establish DPF reaction Map, get DPF reaction temperature, DPF pressure difference and NO 2 consumption relationship.

[0055] b1: Get the reaction temperature of DPF;

[0056] b2: Obtain the pressure difference of the DPF to determine the regeneration efficiency of the DPF;

[0057] b3: Obtain the NO of the DPF 2 consumption;

[0058] b4: Record DPF reaction temperature, DPF pressure difference and NO 2 the...

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Abstract

The present invention relates to a NO-based 2 The method for controlling the tail gas post-treatment system regulated by the medium includes the following steps: establishing a DOC reaction map, a DPF reaction map, and an SCR reaction map; obtaining the SCR reaction temperature and the required SCR reaction efficiency, and obtaining NO from the SCR reaction map; 2 Demand; obtain the DPF reaction temperature and pressure difference, and get NO from the DPF reaction Map 2 consumption; get NO 2 Generated amount, calculate the NO of SCR 2 Input quantity; if NO 2 Input amount is not equal to NO 2 demand, then calculate the target NO 2 Generated amount, target NO obtained from the DOC reaction Map 2 The target DOC reaction temperature corresponding to the generated amount, adjust the fuel injection rate, so that the DOC reaction temperature is equal to the target DOC reaction temperature. Compared with the prior art, the present invention is based on NO 2 Carry out the control of the exhaust gas after-treatment system so that the NO after being consumed by DPF 2 The input amount is equal to the NO of the SCR 2 Demand, considering the coupling and synergy between DOC, DPF and SCR, controls the exhaust after-treatment system from an integrated perspective, the control method is more scientific, and the control accuracy is higher.

Description

technical field [0001] The invention relates to the field of engine exhaust treatment, in particular to a NO-based 2 A control method for an exhaust after-treatment system controlled by a medium. Background technique [0002] Diesel particulate capture technology and selective catalytic reduction technology are synergistically reducing diesel particulate matter (PM) and nitrogen oxides (NO x ) emissions, these two technologies have been widely used in the exhaust purification of diesel engines. Due to the need to protect the environment, exhaust emission regulations are becoming increasingly stringent. In order to reduce particulate matter and nitrogen oxide emissions, the exhaust gas composed of oxidation catalytic converter (DOC), particulate filter (DPF) and selective catalytic reduction device (SCR) Aftertreatment systems have become standard equipment on diesel engines. Oxidation catalytic converter DOC is mainly used to reduce gaseous pollutants such as CO and THC i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N9/00F01N11/00
CPCF01N9/00F01N11/00F01N11/002Y02T10/40F01N3/0231F01N3/035F01N3/2066F01N2250/02F01N2430/08F01N2560/026F01N2560/06F01N2560/08F01N2570/14F01N2900/1406F01N2900/1602F01N2900/1621Y02T10/12
Inventor 张允华楼狄明谭丕强胡志远房亮
Owner TONGJI UNIV
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