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In-use vehicle SCR post-treatment control method and system

A control method and technology for vehicles in use, applied in exhaust treatment, mechanical equipment, engine components, etc., can solve problems such as inability to send signals, and achieve accurate closed-loop control.

Inactive Publication Date: 2020-09-04
WUXI WEIFU LIDA CATALYTIC CONVERTER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in-use vehicles are often unable to send out the above signals, and it is necessary to develop an SCR control st

Method used

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  • In-use vehicle SCR post-treatment control method and system
  • In-use vehicle SCR post-treatment control method and system
  • In-use vehicle SCR post-treatment control method and system

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Embodiment Construction

[0048] In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, in conjunction with the accompanying drawings and preferred embodiments, the specific implementation methods, Structure, characteristic and effect thereof are as follows in detail. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0049] In this embodiment, a method for controlling after-treatment of the SCR in use is provided, such as figure 1 As shown, the SCR post-processing control methods for vehicles in use include:

[0050] Step S110: Obtain the calibrated engine displacement preset value and upstream NOx concentration value;

[0051] Step S120: Calculate the estimated NOx mass f...

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Abstract

The invention relates to the technical field of diesel engine tail gas post-treatment, and particularly discloses an in-use vehicle SCR post-treatment control method. The method comprises the steps that an original engine NOx mass flow estimated value is obtained through calculation according to an obtained engine displacement preset value and an upstream NOx concentration value; an SCR catalyst conversion efficiency table is inquired according to an obtained upstream SCR temperature value, and the current conversion efficiency of an SCR catalyst is obtained; the urea pre-injection amount is obtained through calculation according to the original engine NOx mass flow estimated value and the current conversion efficiency of the SCR catalyst, when that no ammonia leakage happens in an SCR system is judged, the difference value between a downstream NOx concentration value and a downstream NOx target concentration value is obtained, and a closed-loop adjusting coefficient is obtained through calculation according to the difference value; and the current urea injection amount is obtained through calculation according to the urea pre-injection amount and the closed-loop adjusting coefficient. The invention further discloses an in-use vehicle SCR post-treatment control system. According to the in-use vehicle SCR post-treatment control method, the urea injection amount can be automatically adjusted, and the in-use vehicle tail gas emission requirement is met.

Description

technical field [0001] The present invention relates to the technical field of post-treatment of diesel engine exhaust, and more specifically, to a control method and system for SCR post-treatment of an in-use vehicle. Background technique [0002] SCR post-treatment technology is the main technical method for diesel engines to reduce NOx in exhaust gas. Its basic principle is that the ammonia gas formed by spraying urea hydrolysis and atomization undergoes oxidation-reduction reaction with NOx in exhaust gas in the catalyst to generate harmless nitrogen gas. [0003] With the gradual tightening of national emission regulations, starting from the National IV emission regulations, SCR systems have been applied to diesel vehicles in batches. The SCR system generally consists of a control system, a urea injection system, related sensors, and a urea heating device. The control system is the brain of the SCR system. into the SCR catalytic converter to reduce the NOx emission val...

Claims

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Application Information

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IPC IPC(8): F01N3/20
CPCF01N3/208F01N2570/14F01N2610/02F01N2610/148F01N2900/1402F01N2900/1411F01N2900/1616Y02T10/12Y02A50/20
Inventor 苗垒陶建忠刘洋
Owner WUXI WEIFU LIDA CATALYTIC CONVERTER
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