Urea-SCR control parameter off-line calibration system and calibration method

A technology for calibrating system and controlling parameters, applied in the direction of chemical process analysis/design, etc., can solve the problems of high cost, high work intensity, long cycle, etc., and achieve the effect of reducing work intensity, reducing test content, and shortening the calibration cycle

Pending Publication Date: 2019-03-01
DONGFENG COMML VEHICLE CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of long period, high cost and high work intensity in the prior art, and provide a Urea-SCR control parameter off-line calibration system and calibration method with short period, low cost and low work intensity

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  • Urea-SCR control parameter off-line calibration system and calibration method

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Embodiment 1

[0040] see figure 1 , a Urea-SCR control parameter offline calibration system, including a simulation model 1, a simulation value and a target value comparison unit 2, a simulation parameter adjustment unit 3, the simulation model 1 includes a No. 1 input port 11, a No. 2 input port 12, Urea injection quantity simulation model 13, NOx or NH after injection 3 The discharge amount simulation model 14, the input port of the urea injection amount simulation model 13 is connected with the output port of the working condition information memory 4 through the first input port 11, and the output port of the urea injection amount simulation model 13 is passed through the NOx / NH 3 The emission simulation model 14 is connected with the first input port 21 of the simulation value and target value comparison unit 2, and the second input port 22 of the simulation value and target value comparison unit 2 is connected with the output port of the target value information memory 5, and the simu...

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Abstract

The invension provides a Urea-SCR control parameter off-line calibration system, which comprises a simulation model, a simulation value and target value comparison unit and a simulation parameter adjustment unit. When running, the simulation model firstly calculates and obtains a urea injection amount simulation value or a post-injection NOx / NH3 emission simulation value according to the working condition information stored in a working condition information memorizer and transmits the urea injection amount simulation value or the post-injection NOx / NH3 emission simulation value to a simulation value and target value comparison unit, then the simulation value and target value comparison unit compares the received simulation value with the target value, if the inequation |the simulation value- the target value| > e is satisfied, the simulation parameter adjustment unit adjusts the simulation parameter and then inputs the adjusted simulation parameter into the simulation model to carry out the simulation calculation of the next round, if the inequation |the simulation value- the target value| < e is satisfied, the calibration is finished, wherein e refers to a maximum allowable deviation value. The design not only shortens the calibration period and saves the calibration cost, but also remarkably reduces the calibration working strength.

Description

technical field [0001] The invention belongs to the field of vehicle post-processing systems, and specifically relates to an off-line calibration system and calibration method for Urea-SCR control parameters, which are suitable for shortening the calibration cycle, saving calibration costs, and reducing calibration work intensity. Background technique [0002] At present, Urea-SCR technology is considered to reduce the NO X The most effective method of emission is to spray urea solution with a mass fraction of 32.5% into the exhaust pipe through the urea injection system, and it needs to be converted into NH through the process of bumping, evaporation, hydrolysis, and pyrolysis. 3 , and then react with NOx to reduce the exhaust NOx emission of vehicle diesel engine. [0003] With the increasingly stringent emission regulations, the NOx emission limit is getting lower and lower, so the aftertreatment system needs a more precise urea injection control strategy to achieve high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C20/10
Inventor 陈旭冯坦张远何胜勇李鹏远赵文冉
Owner DONGFENG COMML VEHICLE CO LTD
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