Tail gas after-treatment real-time monitoring system

A real-time monitoring system and tail gas post-treatment technology, applied in exhaust gas treatment, electronic control of exhaust gas treatment devices, diagnostic devices of exhaust gas treatment devices, etc., can solve the lack of drivers, serious problems of after-treatment systems, damage and other issues, to achieve the effect of large market potential, high practicability, and convenient installation

Pending Publication Date: 2022-01-18

移动源后处理技术(河南)研究院有限公司

0 Cites 0 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0003] Oxidation Catalyst (DOC), Catalytic Particulate Filter (CDPF) and Selective Catalytic Reduction (SCR) have been widely used in the aftertreatment of diesel engine exhaust. A series of problems such as abnormal injection require real-time monitoring of the performance and status of the post-processing system, especially for the curre...

Abstract

The invention relates to a tail gas after-treatment real-time monitoring system. The tail gas after-treatment real-time monitoring system comprises a sensor layer, a driving layer, a signal processing layer, a CAN communication layer, a strategy laye, a wireless display screen and a ZigBee communication protocol, wherein the sensor layer is responsible for acquiring sensor signals as a decision basis of the strategy layer, the driving layer is used for ensuring stable transmission of signals in a hardware layer, the signal processing layer is used for processing digital signals and analog signals for the strategy layer to use, the CAN communication layer is used for ensuring that signals are stably transmitted and received on a CAN bus, each decision module of DOC, DPF and SCR adopts a model-based method to realize recognition, feedback and decision of a post-processing system state according to the signals of the sensor layer and the signals processed by the signal processing layer, the wireless display screen is used for displaying real-time information and giving an alarm for abnormal information. According to the tail gas after-treatment real-time monitoring system, aiming at the post-processing transformation vehicle, especially the national III vehicle without a OBD system, the state of the post-processing system of the vehicle can be prompted in real time, and if a fault occurs, a driver can be prompted to carry out overhaul, maintenance, replacement and the like in time.

Application Domain

Internal combustion piston enginesExhaust apparatus +4

Technology Topic

Driver/operatorEmbedded system +9

Image

Examples

Experimental program(7)

Example Embodiment

[0060] Example 1:

[0061] like figure 1 , figure 2 , The latter monitoring system for exhaust gas treatment, comprising: a sensor layer: is responsible for collecting sensor signal, as the policy decision making layer;

[0062] Drive layer: Used to ensure that the signal is stably transmitted in hardware layer;

[0063] Signal Processing Layer: Processing digital signals and analog signals for use in the policy layer;

[0064] CAN communication layer: Make sure the signal is stably sent and received on the CAN bus;

[0065] Strategy layer: DOC3, DPF6 SCR11 and decision module in accordance with the respective signal of the sensor layer signal and the signal processing layer processing, recognition processing based method of system state after implementation of the model, the feedback, the decision-making;

[0066] Wireless Display: Display real-time information and alarms an exception information;

[0067] And the ZigBee communication protocol.

[0068] Preferably, the sensor including but not limited to NOx sensor disposed in the first exhaust pipe inlet 1, a first temperature sensor 2; and a second temperature sensor disposed in DOC3 outlet 4, a differential pressure sensor disposed at both ends of the DOC3 5; disposed the second NOx sensor SCR11 inlet 7, third temperature sensor 8; SCR11 third NOx sensor is arranged in the outlet 12, NH3 sensor 13, the fifth temperature sensor 18; level sensor 14, a fourth temperature sensor 16.

[0069] Preferably, the driving layer including but not limited to the MCU drives, EEPROM drive, communication drivers and I / O drivers.

[0070] Preferably, the signal processing layer processing signals acquired by the sensor comprises an internal signal processing module, and an external signal processing module CAN bus signals.

[0071] Preferably, CAN communication service system comprises a communication layer layer, the memory layer communication service and communication service communication layer.

[0072] Preferably, the layer comprises DOC3 policy policies, policies, and the DPF 6 SCR11 policy.

[0073] CAN data communication layer to protect the signal processing layer can be stable and secure transport to the policy level, based on the basic principles related to CAN communication signal and communication infrastructure, communication modules will be used for strategic planning of data transmission to a stable level, system service module the system provides diagnostic capabilities for current and historical failures, memory services occurring within the diagnostic system will save important data backup, data loss when the backed-up data can be used.

[0074] like image 3 As shown in this embodiment, only the DOC3 be related fault diagnosis, since the pressure difference across the exhaust gas volume flow DOC3 substantially linearly correlated with an increase in pressure increases the exhaust gas volume flow, therefore proposed a fault diagnostic parameter K for calculation formula (1):

[0075] (1)

[0076] Where: p is the differential pressure across the DOC3; V is the volume flow flowing through the DOC3; T is the temperature of the gas.

[0077] DOC3 offset direction between the parameter K according to the different operating conditions of temperature DOC3 collection ends, the engine exhaust gas flow and pressure data, the value of K smooth curves plotted using different fault types of an unknown fault characteristic parameter K DOC3 normal state and offset is determined by analysis of the degree of fault type and fault. Characterization offset direction different fault types, the parameter K clogging up indicate a fault offset, offset downwardly failure showed damage, the degree of fault characterizing offset, offset indicates a better degree of fault deeper.

[0078] DOC3 degree of fault diagnosed and damage, blockage fault type passed through ZigBee wireless communication protocol to the display end, wireless display to show real-time information and accompanied by prompt warning tone, suggesting that the current DOC3 driver monitoring information system.

Example Embodiment

[0079] Example 2:

[0080] like Figure 4 As shown in this embodiment, only the DPF6 be related fault diagnosis, based on the calculated carbon load model, the process of loading DPF6 discretizing summation, the As a unit of time, Condition as unchanged within the engine, the reading time T, engine operating conditions, fuel consumption, exhaust gas flow rate, according to the universal characteristic emission curves, determined Original time displacement engine particulate matter, the temperature sensor 2 in accordance with a first temperature sensor 4 and the second temperature, third temperature sensor 8 and the fifth temperature sensor 18 and the temperature difference between the basic vector parameter determination O 2 NO 2 Amount of oxidation of the particulate matter, determined Carbon load variation amount of time, the last time is obtained by integrating the DPF soot mass.

[0081] By reading the pressure DPF6 disposed upstream and downstream of the differential pressure sensor 5, analyze the variation of longitudinal position of the pressure sensor trap differential pressure, compared, and then the results obtained as a diagnostic tool, to diagnose whether to remove the catalyst .

[0082]The carbon-load model based on the flow resistance is evaluated, and the DPF6 carbon charge is evaluated, and the DPF6 is compared to the carbon load threshold, and the corresponding response measures are determined for overload state.

[0083] In the case of satisfying the diagnostic working condition, in a certain period of time, the actually captured carbon charge is calculated by the carbon-load model calculated by the carbon-load model, determined whether the DPF6 capture efficiency decreases by the carbon-load model. .

[0084] When the DPF6 is leaked, M1 is calculated based on the carbon-load calculation model will be larger than the carbon load M2 obtained by reflecting the pressure drop exhaust flow in front of DPF6. The M2 is actually trapped as the particulate matter, and M1 is the quality should be trapped in theory. If (M1- M2) / M2 is greater than the threshold, the leak failure is confirmed.

[0085] By measuring the differential pressure sensor measured in real time , And by volume flow q v The pressure difference of the carbon mass M1 recruising with the carbon load theory calculation model Comparative comparison, Set the fault limit factor, More than 1.2 Determine if the DPF6 is blocked, the pressure difference real value exceeds the set differential pressure, indicating that the DPF6 is blocked and the fault indicator is required.

[0086] The flow resistance is based on an aging judgment. After removal of ash, the flow resistance of DPF6 is compared to the exhaust resistance of the original filter body, and the degree of aging of DPF6 is analyzed, and the DPF6 aging needs to be replaced.

[0087] Monitor the third temperature sensor 8 temperature, determine whether the regeneration ends, after the regeneration is completed, read the flow Q at this time v Back pressure After the temperature correction, calculate its corresponding flow resistance R, and the maximum threshold of DPF6 flow after complete regeneration. max During comparison, it is determined whether the DPF6 is incompletely regenerated.

[0088] Read the fuel consumption within a certain period of time, estimate the number of carbon-loaded capture, and the number of times required for calculating the theory. The actual regeneration period is compared to the theoretical value in this period of reading, and it is determined whether it is frequent regeneration.

[0089] DPF6 Diagnosis DPF6 removal, DPF6 overload, DPF6 trap efficiency, DPF6 leak, DPF6 block, DPF6 physical aging, DPF6 incomplete regeneration and DPF6 frequent regeneration, etc. Fault pass through the ZigBee communication protocol wireless passed to the display terminal, wireless display Show real-time information and accompanied by a warning alarm, prompting the driver's current monitoring information.

[0090] The remainder of this embodiment is the same as in Example 1.

Example Embodiment

[0091] Example 3:

[0092] like Figure 5 As shown, in this embodiment, only the fault associated with urea 15 is diagnosed, based on the PID closed loop control strategy, the control principle is equally (2):

[0093] (2)

[0094] In the form of For the proportional coefficient, For the integral coefficient, Differential coefficient.

[0095] When the third temperature sensor 8 measured the difference in the measured value of the fifth temperature sensor 18 is greater than the threshold value of the temperature difference value before and after the SCR11 catalyst, and the absolute value of the upstream temperature estimation residual of the SCR11 catalyst is greater than the upstream temperature of the SCR11 catalyst. When the residual threshold is estimated, the third temperature sensor 8 upstream of the SCR11 catalyst is diagnosed.

[0096] When the third temperature sensor 8 of the SCR11 catalyst, the difference between the measured value of the downstream temperature sensor is larger than the threshold value of the temperature difference value before and after the SCR11 catalyst, and the absolute value of the downstream temperature estimation residue of the SCR11 catalyst is greater than the SCR11 catalyst. When the downstream temperature estimates the residual threshold, the diagnosis is a failure of the SCR11 catalyst fifth temperature sensor 18.

[0097] When the absolute value of the estimated residual of the upper reacstall of the SCR11 catalyst is larger than the estimating residual threshold of the second NOx sensor 7 upstream NOx sensor 7 upstream of the SCR11 catalyst, the second NOx sensor 7 in which the SCR11 catalyst is diagnosed.

[0098] When the absolute value of the estimated residual of the downstream NOx concentration of the SCR11 catalyst is larger than the estimated residual threshold of the third NOx sensor 12, the third NOx sensor 12 is diagnosed.

[0099] When the model estimated SCR11 catalyst, the boundary is less than the threshold equal to the sum of the SCR11 catalyst, and the estimated SCR system NOx conversion efficiency is less than equal to the threshold of the SCR11 system NOx conversion efficiency, and estimated urea When the cross-sectional coefficient of the nozzle is less than the threshold of the urea nozzle coefficient, the diagnosis of urea injection is significantly reduced.

[0100] When the model estimated by the mild seepage leakage of the SCR11 catalyst is greater than the threshold equal to the amount of the SCR11 catalyst, and the estimated SCR11 catalyst ammonia cover is larger than the threshold equal to the SCR11 catalyst ammonia cover. Diagnosis of urea injection has increased significantly.

[0101] When the actual average consumption of urea solution and the difference between the theoretical mean consumption of urea solution and the absolute value of the theoretical mean consumption of urea solution are greater than or equal to 0.5, the diagnosis of urea injection is severely inconsistent with the problem.

[0102] When the model estimated by the molt leakage of the SCR11 catalyst, the boundary is greater than the threshold equal to the lower reaches of the SCR11 catalyst, and the estimated SCR11 catalyst ammonia cover is less than or equal to the threshold of the SCR11 catalyst ammonia cover. The estimated SCR11 system NOx conversion efficiency is less than the threshold equal to the SCR11 system NOx conversion efficiency, the SCR11 catalytic aging fault is diagnosed.

[0103] The third temperature sensor 8, the fifth temperature sensor 18, the second NOx sensor 7, the third NOx sensor 12 diagnosed, and the amount of urea injection is greatly reduced, and the amount of urea injection is severe, and the amount of urea injection is severe. The fault such as aging is transmitted to the display terminal through the ZigBee communication protocol, and the wireless display shows real-time information and has a prompt alarm sound, prompting the driver's current SCR11 system monitoring information.

[0104] The remainder of this embodiment is the same as in Example 1.

PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Classification and recommendation of technical efficacy words

Improve practicality
low cost

Tail gas after-treatment real-time monitoring system

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

Similar technology patents

Multi-beam resonance light energy-carrying communication system

Agricultural fertilization machine with rationed fertilization effect

Energy-saving and environment-friendly collecting device for kitchen waste

Video information indication method and set-top box

Adjustable computer showing stand

Classification and recommendation of technical efficacy words

Device and method for constructing self-adaptive graphic user interface (GUI)

A hardware-in-the-loop real-time simulation system and a method for realizing rapid prototype control

Adaptive air conditioner on basis of wearable equipment

Photographing method and terminal

Cutting equipment of novel rectangular plate large-area peeling device

Method, apparatus and article for microfluidic control via electrowetting, for chemical, biochemical and biological assays and the like

System and method for transmitting wireless digital service signals via power transmission lines

Plastic waveguide-fed horn antenna

System and method for determination of position

Adaptive antenna optimization network