A remote on-line monitoring and optimization method for scr efficiency of a diesel engine

An optimization method, diesel engine technology, applied in mechanical equipment, engine components, combustion engines, etc., can solve problems such as increased customer complaints, decreased SCR efficiency, time-consuming and labor-intensive problems, so as to improve data quality and robustness, and resolve customer complaints , The effect of liberating engineer resources

Active Publication Date: 2021-09-17
JIANGLING MOTORS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SCR conversion efficiency is affected by many factors such as urea quality, urea nozzle, catalyst activity, catalyst S poisoning, exhaust temperature, ambient temperature, etc., which may cause a decline in SCR conversion efficiency. However, there is currently no effective strategy for real-time remote online monitoring of SCR. Efficiency and drawing robust graphs, SCR conversion efficiency can only be checked by engineers through on-site records of dedicated calibration equipment, which is time-consuming and laborious
[0003] Moreover, when the vehicle's SCR efficiency drops due to some factors and a fault is reported, the operating condition data at the time of the fault cannot be accurately reproduced and collected, so it is impossible to conduct accurate analysis on the fault condition, and only through the engineer's visit to the scene Investigate various potential problems and potential working conditions, unable to accurately locate the problem point, and need to occupy the customer's vehicle site for repeated collection, repeated correction, and repeated verification, which will bring great inconvenience to the customer's car use and increase customer complaints; due to the large number of after-sales vehicles, It is also a great test for limited engineer resources
[0004] In addition, in the bench SCR efficiency calibration stage, it is impossible to make full use of the SCR efficiency cloud data collected remotely from the vehicle to feed back and optimize the bench calibration

Method used

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  • A remote on-line monitoring and optimization method for scr efficiency of a diesel engine
  • A remote on-line monitoring and optimization method for scr efficiency of a diesel engine
  • A remote on-line monitoring and optimization method for scr efficiency of a diesel engine

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Embodiment 1

[0039] see figure 1 , the diesel engine SCR efficiency remote online monitoring and optimization method of the present invention includes the acquisition of SCR efficiency measurement signals and the monitoring and optimization process of signals, wherein:

[0040] Signal acquisition part: use TBOX remote terminal equipment to connect the ECU and the cloud, set the variable configuration in the cloud and send it to TBOX for measurement signal acquisition; among them, the communication between TBOX and ECU is based on the XCP protocol of the CAN line, and the communication between TBOX and the cloud Signal transmission through wireless network strategies such as 4G / 5G;

[0041] Monitoring optimization part: After the data is uploaded to the cloud, the data is monitored, analyzed and optimized:

[0042] 1) Continuously record and save basic variables such as rotational speed, oil volume, torque, vehicle speed, ambient temperature, water temperature, intake air volume, and real-...

Embodiment 2

[0046] see figure 1 , figure 2 . The remote on-line monitoring and optimization method of diesel engine SCR efficiency of the present embodiment, and the difference of embodiment 1 are: further, such as figure 2 As shown, the acquisition process of the measurement signal includes:

[0047] 1) The cloud sends the collection command and sends the DAQ List configuration

[0048] 2) TBox accesses ECU to request security authentication

[0049] 3) XCP DAQ List preprocessing, DAQ List mainly includes the following (generated through A2L file conversion)

[0050] (1) List unique identification number

[0051] (2) ODT unique identification number

[0052] (3) elements

[0053] (4) Element length

[0054] (5) Page address

[0055] (6) address

[0056] 4) Collect ODT data and upload it to the cloud.

[0057] figure 2 It is the interactive communication interface between the cloud, TBOX, and ECU. The TBOX device communicates with the ECU through the CAN line, and the cloud a...

Embodiment 3

[0059] The remote online monitoring and optimization method of diesel engine SCR efficiency in this embodiment differs from Embodiment 1 or Embodiment 2 in that: further, the monitoring and optimization part: when the fault state position 1 fault is triggered, the 1 before and after the fault trigger is automatically saved. Hours of data, input this part of the data to the MATLAB model for offline optimization, verify the optimized data on the real vehicle, and solve the fault. For the SCR efficiency calculation model, see image 3 shown.

[0060] image 3 is a schematic diagram of the SCR efficiency model of MATLAB. When the dew point of the upstream and downstream NOx sensors is released, the upstream temperature of the SCR is between 200°C and 350°C, the urea pump pressure is 5bar, and the fuel injection volume is greater than 5mg / hub, the PPM measured values ​​of the upstream and downstream NOx sensors are respectively multiplied by the exhaust gas flow rate and integrate...

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Abstract

A method for remote online monitoring and optimization of diesel engine SCR efficiency, including the acquisition of SCR efficiency measurement signals and the process of signal monitoring and optimization. The signal acquisition part uses a TBOX remote terminal device to connect the ECU to the cloud, and the variable configuration is set in the cloud and sent to the TBOX collects measurement signals; uploads data to the cloud, and optimizes data monitoring and analysis: 1) Continuously records and saves basic variables of real-time values ​​of speed, oil volume, torque, vehicle speed, ambient temperature, water temperature, air intake, and SCR efficiency, and real-time Output SCR efficiency measured value graphics for online monitoring; at the same time, SCR efficiency cloud data is used to feed back and optimize bench calibration; Variables for SCR efficiency diagnosis including injection quantity, NH3 storage value, engine operation mode, SCR efficiency measured value, and SCR efficiency limit value are continuously recorded and saved. When the enabling conditions of SCR efficiency diagnosis are met, the robust graph is automatically output.

Description

technical field [0001] The invention relates to a method for monitoring and optimizing the efficiency of selective catalytic reduction of flue gas denitrification technology, in particular to a method for remote online monitoring and optimizing the SCR efficiency of a national VI diesel vehicle. Background technique [0002] At present, the NOx emission of motor vehicles, especially the National VI diesel vehicles, has become the top priority of the current air pollution prevention and control work. For reducing NOx emissions, the mainstream technology route is the SCR (Selective Catalytic Reduction) strategy, which converts NOx emission pollutants in the exhaust gas into N2 by injecting urea. SCR conversion efficiency is affected by many factors such as urea quality, urea nozzle, catalyst activity, catalyst S poisoning, exhaust temperature, ambient temperature, etc., which may cause a decline in SCR conversion efficiency. However, there is currently no effective strategy fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N11/00F01N9/00
CPCF01N9/007F01N11/00Y02T10/40Y02A50/20
Inventor 孟强邹笔锋熊建万川吴星
Owner JIANGLING MOTORS
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