CN110985174B - SCR system conversion efficiency monitoring system and method - Google Patents
SCR system conversion efficiency monitoring system and method Download PDFInfo
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- CN110985174B CN110985174B CN201911304994.5A CN201911304994A CN110985174B CN 110985174 B CN110985174 B CN 110985174B CN 201911304994 A CN201911304994 A CN 201911304994A CN 110985174 B CN110985174 B CN 110985174B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1621—Catalyst conversion efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a system and a method for monitoring conversion efficiency of an SCR system, wherein the system comprises a data receiving module, a monitoring condition judging module, an integrating module, an efficiency calculating module and a fault judging module; the data receiving module is used for receiving and processing signals sent by an engine ECU and an NOx sensor; the monitoring condition judgment module is used for calculating the received data and judging whether the working condition of the engine is suitable for efficiency monitoring; the integration module is used for integrating the mass flow of the actual upstream NOx, the actual downstream NOx and the theoretical downstream NOx of the catalyst; the efficiency calculation module is used for calculating the actual and theoretical conversion efficiency through the integrated quality; and the fault judgment module is used for comparing the actual efficiency with the theoretical efficiency so as to report the fault. The invention can accurately monitor the NOx conversion efficiency of the SCR system catalyst, and can give an alarm in time to meet the requirements of regulations when the efficiency does not meet the requirements.
Description
Technical Field
The invention relates to the technical field of tail gas aftertreatment, in particular to a system and a method for monitoring conversion efficiency of an SCR system.
Background
The Selective Catalytic Reduction (SCR) technology has the advantages of high NOx conversion efficiency, strong sulfur resistance, low oil consumption and the like, and is one of effective technical measures for medium and heavy diesel vehicles in China to meet the national IV and above emission regulations. At present, the urea SCR technology is widely applied to medium and heavy diesel vehicles. However, with the continuous upgrade of national emission regulations, the country has more strict regulatory requirements for the conversion efficiency of the SCR system, and each engine and aftertreatment plant need to develop more accurate monitoring methods to meet the requirements of the regulations.
Disclosure of Invention
The present invention is directed to a system and method for monitoring conversion efficiency of an SCR system to solve the problems discussed in the background section above.
In order to achieve the purpose, the invention adopts the following technical scheme:
a kind of SCR system conversion efficiency monitoring system, this system includes the data receiving module, monitors the judging module of the condition, integral module, efficiency calculation module and failure judging module; the data receiving module is used for receiving and processing signals sent by an engine ECU and an NOx sensor; the monitoring condition judging module is used for calculating the received data and judging whether the working condition of the engine is suitable for efficiency monitoring; the integration module is used for integrating the mass flow of the actual upstream NOx, the actual downstream NOx and the theoretical downstream NOx of the catalyst; the efficiency calculation module is used for calculating the actual and theoretical conversion efficiency through the integrated quality; and the fault judgment module is used for comparing the actual efficiency with the theoretical efficiency so as to report the fault.
Specifically, the data receiving module receives data including engine speed, oil consumption, torque, engine water temperature, ambient pressure, exhaust gas flow rate, NOx values sent by upstream and downstream NOx sensors, and SCR exhaust temperature sensor signals sent by the engine ECU through the CAN bus.
Particularly, the monitoring condition judgment module is specifically used for judging whether the rotating speed, the oil consumption and the catalyst temperature of the engine are in a reasonable range; and judging whether the change of the rotating speed, the oil consumption and the temperature of the catalyst of the engine is in a reasonable range.
In particular, the integration module is further configured to clear and reintegrate the three integrators simultaneously after the actual upstream NOx value of the catalyst has been integrated to the setpoint.
Based on the SCR system conversion efficiency monitoring system, the invention also discloses an SCR system conversion efficiency monitoring method, which comprises the following steps:
s101, a data receiving module receives and processes signals sent by an engine ECU and an NOx sensor;
s102, the monitoring condition judging module calculates the received data and judges whether the working condition of the engine is suitable for efficiency monitoring;
s103, integrating the mass flow of the actual upstream NOx, the actual downstream NOx and the theoretical downstream NOx of the catalyst by an integration module;
s104, calculating actual and theoretical conversion efficiency through the integrated quality by an efficiency calculation module; and the fault judgment module is used for comparing the actual efficiency with the theoretical efficiency so as to report the fault.
Specifically, the data received by the data receiving module in step S101 includes engine speed, oil consumption, torque, engine water temperature, ambient pressure, exhaust gas flow rate, NOx values sent by upstream and downstream NOx sensors, and SCR exhaust temperature sensor signals sent by the engine ECU through the CAN bus.
Specifically, the step S102 specifically includes: the monitoring condition judging module judges whether the rotating speed, the oil consumption and the catalyst temperature of the engine are in a reasonable range or not; and judging whether the change of the rotating speed, the oil consumption and the temperature of the catalyst of the engine is in a reasonable range.
Specifically, the step S103 specifically includes: the integration module clears the three integrators simultaneously and reintegrates the three integrators after the actual upstream NOx value of the catalyst has been integrated to the set point.
The SCR system conversion efficiency monitoring system and method provided by the invention can accurately monitor the conversion efficiency of the SCR system catalyst to NOx, and can give an alarm in time to meet the requirements of regulations when the efficiency does not meet the requirements.
Drawings
Fig. 1 is a schematic diagram of a system for monitoring conversion efficiency of an SCR system according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It is also to be noted that, for the convenience of description, only a part of the contents, not all of the contents, which are related to the present invention, are shown in the drawings, and unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, fig. 1 is a schematic view of a SCR system conversion efficiency monitoring system according to an embodiment of the present invention.
The SCR system conversion efficiency monitoring system in the embodiment specifically comprises a data receiving module, a monitoring condition judging module, an integrating module, an efficiency calculating module and a fault judging module; the data receiving module is used for receiving and processing signals sent by an engine ECU and an NOx sensor; the monitoring condition judging module is used for calculating the received data and judging whether the working condition of the engine is suitable for efficiency monitoring; the integration module is used for integrating the mass flow of the actual upstream NOx, the actual downstream NOx and the theoretical downstream NOx of the catalyst; the efficiency calculation module is used for calculating the actual and theoretical conversion efficiency through the integrated quality; and the fault judgment module is used for comparing the actual efficiency with the theoretical efficiency so as to report the fault.
Specifically, in this embodiment, the data receiving module receives the data including the engine speed, the oil consumption, the torque, the engine water temperature, the ambient pressure, the exhaust gas flow rate, the NOx value sent by the upstream and downstream NOx sensors, and the SCR exhaust temperature sensor signal sent by the engine ECU through the CAN bus.
Specifically, in this embodiment, the monitoring condition determining module is specifically configured to determine whether a rotation speed, an oil consumption, and a catalyst temperature of the engine are within a reasonable range; and judging whether the change of the rotating speed, the oil consumption and the temperature of the catalyst of the engine is in a reasonable range.
Specifically, in the embodiment, the integration module is further configured to clear the three integrators at the same time and re-integrate the three integrators after the actual upstream NOx value of the catalyst is integrated to the set value.
Based on the above SCR system conversion efficiency monitoring system, this embodiment also discloses a method for monitoring the conversion efficiency of the SCR system, which includes:
s101, a data receiving module receives and processes signals sent by an engine ECU and an NOx sensor;
s102, the monitoring condition judging module calculates the received data and judges whether the working condition of the engine is suitable for efficiency monitoring;
s103, integrating the mass flow of the actual upstream NOx, the actual downstream NOx and the theoretical downstream NOx of the catalyst by an integration module;
s104, calculating actual and theoretical conversion efficiency through the integrated quality by an efficiency calculation module; and the fault judgment module is used for comparing the actual efficiency with the theoretical efficiency so as to report the fault.
Specifically, in this embodiment, the data received by the data receiving module in step S101 includes engine speed, oil consumption, torque, engine water temperature, ambient pressure, exhaust gas flow rate, NOx values sent by upstream and downstream NOx sensors, and SCR exhaust temperature sensor signals sent by the engine ECU through the CAN bus.
Specifically, in this embodiment, the step S102 specifically includes: the monitoring condition judging module judges whether the rotating speed, the oil consumption and the catalyst temperature of the engine are in a reasonable range or not; and judging whether the change of the rotating speed, the oil consumption and the temperature of the catalyst of the engine is in a reasonable range.
Specifically, in this embodiment, the step S103 specifically includes: the integration module clears the three integrators simultaneously and reintegrates the three integrators after the actual upstream NOx value of the catalyst has been integrated to the set point.
The technical scheme provided by the invention can accurately monitor the NOx conversion efficiency of the SCR system catalyst, and can give an alarm in time to meet the requirements of regulations when the efficiency does not meet the requirements.
It will be understood by those skilled in the art that all or part of the above embodiments may be implemented by the computer program to instruct the relevant hardware, and the program may be stored in a computer readable storage medium, and when executed, may include the procedures of the embodiments of the methods as described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory or a random access memory.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (2)
1. The system is characterized by comprising a data receiving module, a monitoring condition judging module, an integrating module, an efficiency calculating module and a fault judging module; the data receiving module is used for receiving and processing signals sent by an engine ECU and an NOx sensor; the monitoring condition judging module is used for calculating the received data and judging whether the working condition of the engine is suitable for efficiency monitoring; the integration module is used for integrating the mass flow of the actual upstream NOx, the actual downstream NOx and the theoretical downstream NOx of the catalyst; the efficiency calculation module is used for calculating the actual and theoretical conversion efficiency through the integrated quality; the fault judging module is used for comparing the actual efficiency with the theoretical efficiency so as to report a fault; the data receiving module receives data, wherein the data comprises engine rotating speed, oil consumption, torque, engine water temperature, ambient pressure, exhaust flow, NOx values sent by upstream and downstream NOx sensors and SCR exhaust temperature sensor signals sent by an engine ECU (electronic control Unit) through a CAN (controller area network) bus; the monitoring condition judgment module is specifically used for judging whether the rotating speed, the oil consumption and the catalyst temperature of the engine are in a reasonable range; judging whether the change of the rotating speed, the oil consumption and the temperature of the catalyst of the engine is in a reasonable range or not; the integration module is further used for clearing and re-integrating the three integrators at the same time after the actual upstream NOx value of the catalyst is integrated to the set value.
2. An SCR system conversion efficiency monitoring method based on the SCR system conversion efficiency monitoring system according to claim 1, characterized by comprising:
s101, a data receiving module receives and processes signals sent by an engine ECU and an NOx sensor; the data received by the data receiving module in the step S101 includes engine rotation speed, oil consumption, torque, engine water temperature, ambient pressure, exhaust flow rate sent by an engine ECU, NOx values sent by upstream and downstream NOx sensors, and SCR exhaust temperature sensor signals received by a CAN bus;
s102, the monitoring condition judging module calculates the received data and judges whether the working condition of the engine is suitable for efficiency monitoring; the method specifically comprises the following steps: the monitoring condition judging module judges whether the rotating speed, the oil consumption and the catalyst temperature of the engine are in a reasonable range or not; judging whether the change of the rotating speed, the oil consumption and the temperature of the catalyst of the engine is in a reasonable range or not;
s103, integrating the mass flow of the actual upstream NOx, the actual downstream NOx and the theoretical downstream NOx of the catalyst by an integration module; the method specifically comprises the following steps: the integration module clears the three integrators simultaneously and then integrates again after the actual upstream NOx value of the catalyst is integrated to a set value;
s104, calculating actual and theoretical conversion efficiency through the integrated quality by an efficiency calculation module; and the fault judgment module is used for comparing the actual efficiency with the theoretical efficiency so as to report the fault.
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| CN112648056B (en) * | 2020-12-11 | 2022-04-26 | 潍柴动力股份有限公司 | Method, device and system for monitoring SCR conversion efficiency |
| CN112682145A (en) * | 2020-12-28 | 2021-04-20 | 潍柴动力股份有限公司 | SCR (Selective catalytic reduction) NOx conversion efficiency monitoring method and device and vehicle |
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