CN110735695A - SCR system, controller and control method thereof, and readable storage medium having the same - Google Patents
SCR system, controller and control method thereof, and readable storage medium having the same Download PDFInfo
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- CN110735695A CN110735695A CN201810799807.4A CN201810799807A CN110735695A CN 110735695 A CN110735695 A CN 110735695A CN 201810799807 A CN201810799807 A CN 201810799807A CN 110735695 A CN110735695 A CN 110735695A
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- signal
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- liquid level
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- 238000000034 method Methods 0.000 title claims description 18
- 239000007788 liquid Substances 0.000 claims abstract description 80
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 65
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000013507 mapping Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013270 controlled release Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001868 water Inorganic materials 0.000 description 1
Images
Classifications
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- 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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1486—Means to prevent the substance from freezing
-
- 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
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1814—Tank level
-
- 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
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1818—Concentration of the reducing agent
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The application provides controllers for controlling and releasing a concentration sensor in an SCR system, which are configured to exchange signals with at least a heater, a liquid level sensor and the concentration sensor in a reducing agent tank in the SCR system, and are further configured to control the heater to heat when the reducing agent in the reducing agent tank in the SCR system is in a frozen state, control the liquid level sensor to measure a liquid level L of the reducing agent when the signal of the liquid level sensor is reliable, map a time interval t from the signal reliability of the liquid level sensor to the signal reliability of the concentration sensor according to the liquid level L, and control and release the concentration sensor after the time t.
Description
Technical Field
The present application relates to a vehicle exhaust aftertreatment system, and more particularly, to an SCR system, a controller thereof, a control method thereof, and a readable storage medium having the same.
Background
In order to reduce the NOx content in the exhaust gas of a vehicle engine, a selective catalytic reduction system (SCR system) has been developed for injecting a reducing agent into the exhaust gas to reduce NOx in the exhaust gas into harmless components such as nitrogen, water, carbon dioxide, etc. by a selective catalytic reduction method. The SCR system comprises a liquid tank containing a reducing agent, a temperature sensor is arranged in the liquid tank of the reducing agent and used for measuring the temperature of the reducing agent, and a liquid level sensor is used for measuring the liquid level of the reducing agent so as to determine the quantity of the reducing agent. In addition, the SCR system requires the use of a standard reducing agent having a specific concentration, and therefore, a reducing agent concentration sensor is provided in the tank in order to detect the concentration of the reducing agent.
In use, a specific concentration of the reducing agent needs to be injected into the tailpipe through the injection system, and therefore, the liquid state of the reducing agent needs to be maintained, and the concentration sensor also needs to maintain the reducing agent in the liquid state, so as to measure accurate concentration data.
However, in environments, the reducing agent inevitably changes into a solid-liquid mixed state or an all-solid state, the volume of the reducing agent changes in the process of solidification, so that the liquid level sensor cannot accurately measure the liquid level, and the concentration sensor cannot accurately measure the concentration of the reducing agent, therefore, a heater needs to be arranged in a liquid tank of the reducing agent, so that the solid-state reducing agent changes into a liquid state again, and data measured by the concentration sensor is reliable enough after the conversion from the solid state to the liquid state is completed.
Disclosure of Invention
The method aims to solve the problem that the time point of completing liquefaction of the reducing agent in the frozen state cannot be accurately estimated in the prior art.
To achieve the above-mentioned objects, the present application provides controllers for controlling a concentration sensor in a release SCR system, configured to exchange signals with at least a heater, a level sensor, and a concentration sensor in a reductant tank of the SCR system, the controllers further configured to,
when a reducing agent in a reducing agent tank in the SCR system is in a frozen state, controlling the heater to heat;
when the signal of the liquid level sensor is reliable, controlling the liquid level sensor to measure the liquid level L of the reducing agent;
mapping a time interval t from the reliability of the liquid level sensor signal to the reliability of the concentration sensor signal according to the liquid level L;
after time t the release of the concentration sensor is controlled.
To achieve the above object, the present application further provides SCR systems, which include a reductant tank, a controller, and a heater, a level sensor and a concentration sensor disposed in the reductant tank, wherein the controller has the features as described above.
To achieve the above object, the present application further provides methods of controlling a concentration sensor in a release SCR system, comprising the steps of:
starting a heater in the SCR system for heating;
judging whether a liquid level sensor signal in the SCR system is reliable or not;
measuring the liquid level L in a state that the signal of the liquid level sensor is reliable;
taking the liquid level L as a parameter, and mapping a time interval t from the reliability of the signal of the liquid level sensor to the normal work of the concentration sensor;
releasing the concentration sensor after time t.
To accomplish the above objects, the present application also provides machine-or computer-readable storage media storing executable instructions that, when executed, implement a method of releasing a concentration sensor as described above.
By using the SCR system, the controller thereof, the control method thereof and the readable storage medium thereof, the liquid level is taken into consideration of the time for completing the liquefaction of the reducing agent in a freezing state, so that a relatively accurate time point for completing the liquefaction of the reducing agent is finally obtained.
Drawings
Exemplary embodiments of the present application will be described in detail below with reference to the attached drawings, it being understood that the following description of the embodiments is only for the purpose of explanation and not limitation of the scope of the present application, and in the accompanying drawings:
FIG. 1 is a block diagram of embodiments of the SCR system of the present application;
FIG. 2 is a graph of reductant temperature versus thaw time for an SCR system of the present application at different levels;
FIG. 3 is a flow chart of embodiments of a method of controlled release of a concentration sensor in an SCR system of the present application.
Detailed Description
It should be understood that the drawings are for purposes of illustration only and that the dimensions, proportions and number of parts are not to be construed as limiting the application.
Please refer to fig. 1, which is a block diagram of embodiments of the SCR (selective catalytic reduction) system according to the present application, the SCR system includes a reductant tank 11, a heater 12 disposed in the reductant tank, a level sensor 13, a concentration sensor 14, and a temperature sensor 16, the SCR control system further includes a controller 15, the reductant tank 11 has a amount of reductant, the level sensor 13 is used to measure the level of the reductant, the concentration sensor 14 is disposed on a side of the reductant tank 11, is generally spaced from the heater 12 by a distance greater than the distance between the level sensor 13 and the heater 12, the temperature sensor 16 is capable of measuring the temperature of the reductant, and the controller 15 is capable of exchanging signals with the heater 12, the level sensor 13, the concentration sensor 14, and the temperature sensor 16.
In this embodiment, the liquid level sensor 13 is specifically an ultrasonic measuring apparatus, ultrasonic waves are transmitted to the liquid level direction through the liquid level sensor 13, reflection is generated when the ultrasonic waves encounter the liquid level, the liquid level sensor 13 receives the reflected waves, that is, the distance between the liquid level and the liquid level sensor 13 can be determined, so as to determine the liquid level, and at this time, the amount of the reducing agent can be specifically determined according to the determined shape of the liquid level and the reducing agent tank, when the signal of the liquid level sensor 13 is reliable, the determination can be performed and the time for which the signal is reliable can be estimated in the following manner, is that the controller 15 firstly controls the temperature sensor 16 to obtain the temperature signal T of the reducing agent, the temperature signal T from the heater 12 is mapped to the time interval T1 when the signal of the liquid level sensor 13 is heated to be reliable, and after the time T1, in addition, is that the liquid level sensor 13 transmits an ultrasonic signal to the liquid level for liquid level detection, and if the ultrasonic signal of the liquid level sensor 13 conforms to the ultrasonic signal of the ultrasonic sensor 13, the ultrasonic sensor 13 is determined to be reliable.
When the SCR system detects that the reducing agent is in a frozen state, whether the reducing agent is in a solid-liquid mixed state or an all-solid state, the SCR system is considered to be in a frozen state in the present application, in this case, the signal of the concentration sensor 14 is considered to be unreliable and cannot be used, at this time, the heater 12 is controlled to heat and judge whether the signal of the level sensor 13 is reliable, when the signal of the level sensor 13 is reliable, the reducing agent level L is obtained according to the measurement of the level sensor 13. please refer to FIG. 2, the time interval t from the reliability of the signal of the level sensor 13 to the reliability of the signal of the concentration sensor 14 is mapped according to the correspondence of the time interval between the reliability of the signal of the reducing agent level L and the reliability of the signal of the level sensor 13 to the reliability of the signal of the concentration sensor 14, then the controller 16 controls the release of the concentration sensor 14 after the reliability of the signal of the level sensor 13, so that the signal of the concentration sensor 14 can be used, the aforementioned acquisition of the current temperature of the reducing agent can be known as solid-liquid mixed state, or solid-liquid mixed state, solid-liquid temperature can be known as , and solid-liquid.
The mapping relations can be obtained through empirical actual tests.
Referring now to fig. 3, a flowchart of the method for controlling the release of the concentration sensor in the SCR system according to the present application is shown, and in the present embodiment, is explained in detail as follows.
In the step S100, when the reducing agent is in a freezing state, a heater in the SCR system is started to heat;
then in step S110, judging whether the signal of a liquid level sensor in the SCR system is reliable or not;
in the step S120, the liquid level L is measured in a state where the signal of the liquid level sensor is reliable;
in the step S130, the liquid level L is taken as a parameter, and a time interval t from the reliability of the signal of the liquid level sensor to the normal work of the concentration sensor is mapped;
in step S140, the concentration sensor is released after time t.
As shown in the foregoing, whether the signal of the liquid level sensor is reliable is obtained, the temperature T of the reducing agent is measured according to the temperature sensor in the SCR system, the time interval T1 from the start of heating by the heater to the reliability of the signal of the liquid level sensor is mapped according to the temperature T, and the signal of the liquid level sensor is judged to be reliable after the time T1.
The time interval from the level sensor signal being reliable to the concentration sensor signal being reliable after the level sensor signal being reliable can also be obtained in the following way. Alternatively, the current reductant temperature T1 is measured by the temperature sensor, and the time interval T from the level sensor signal being reliable to the concentration sensor signal being reliable is mapped according to the level L and the temperature T1. After the signal of the liquid level sensor is reliable, the temperature of the reducing agent can be measured by the temperature sensor and can also be judged and known according to the solid-liquid mixing state of the reducing agent.
To sum up, in this application, at first obtain the reliable time point of level sensor's signal, then, in addition from the reliable time of estimating to the concentration sensor signal of reliable estimation of level sensor signal, obtain the reliable time point of estimating of concentration sensor signal, release concentration sensor again, estimate the error and can not accumulate, therefore the time point of releasing concentration sensor is relatively accurate. In addition, accurate liquid level signals are quoted, and the quantity of the reducing agent is judged firstly, so that the time interval t from the reliability of the liquid level sensor signals to the reliability of the concentration sensor signals can be obtained more accurately. Therefore, the problem that the time point of completing liquefaction of the reducing agent in the frozen state cannot be accurately estimated in the prior art can be solved.
The present application has been described in connection with only the presently preferred embodiments with the understanding that the present disclosure is not to be considered as limiting, and the present application is not limited to the examples described above, but rather, it is to be understood that changes, modifications, additions or substitutions that are within the spirit and scope of the application by one of ordinary skill in the art are included.
Claims (11)
- controller for controlling the release of a concentration sensor in an SCR system, configured to exchange signals with at least a heater, a level sensor, a concentration sensor in a reductant tank in the SCR system, the controller further configured to,when a reducing agent in a reducing agent tank in the SCR system is in a frozen state, controlling the heater to heat;when the signal of the liquid level sensor is reliable, controlling the liquid level sensor to measure the liquid level L of the reducing agent;mapping a time interval t from the reliability of the liquid level sensor signal to the reliability of the concentration sensor signal according to the liquid level L;after time t the release of the concentration sensor is controlled.
- 2. The controller of claim 1, wherein the signal of the level sensor is determined to be reliable by: the controller exchanges signals with a temperature sensor in the SCR system, maps a time interval T1 from the beginning of heating of the heater to the reliability of the signal of the liquid level sensor according to the temperature T, and judges the reliability of the signal of the liquid level sensor after the time T1.
- 3. The controller of claim 1, wherein the signal of the level sensor is determined to be reliable by: after the heater starts to heat, the liquid level sensor continuously emits ultrasonic waves to the liquid level for test, and when the ultrasonic signals of the liquid level sensor accord with the ultrasonic signal characteristics in the liquid reducing agent, the signals of the liquid level sensor are judged to be reliable.
- 4. The controller of claim 2 or 3, wherein the controller is further configured to control the temperature sensor to measure a current reductant temperature T1 when the level sensor signal is reliable, mapping a time interval T from the level sensor signal reliable to a concentration sensor signal reliable as a function of level L and temperature T1.
- 5. The controller according to claim 1, wherein the reducing agent is in a frozen state including a state of being all solid and a state of being mixed solid and liquid.
- SCR system (10) of , comprising a reducing agent tank (11), a controller (15) and a heater (12), a level sensor (13), a concentration sensor (14) arranged in the reducing agent tank (11), characterized in that the controller (15) has the features of any of claims 1 to 5.
- A method of controlling release of a concentration sensor in an SCR system, comprising the steps of:starting a heater in the SCR system for heating;judging whether a liquid level sensor signal in the SCR system is reliable or not;measuring the liquid level L in a state that the signal of the liquid level sensor is reliable;taking the liquid level L as a parameter, and mapping a time interval t from the reliability of the signal of the liquid level sensor to the normal work of the concentration sensor;releasing the concentration sensor after time t.
- 8. The method of releasing a concentration sensor according to claim 7, wherein the method of determining that the level sensor signal is reliable is that the temperature T of the reducing agent is measured according to a temperature sensor in the SCR system, the time interval T1 from the start of heating of the heater to the level sensor signal is mapped according to the temperature T, and the level sensor signal is determined to be reliable after the time T1.
- 9. The method of releasing a concentration sensor according to claim 7, wherein the method of determining that the signal of the level sensor is reliable is that the level sensor continuously emits ultrasonic waves for test after controlling the heater to start heating, and the signal of the level sensor is determined to be reliable when the ultrasonic signal of the level sensor conforms to the ultrasonic signal characteristics in the liquid reducing agent.
- 10. Method of releasing a concentration sensor according to claim 8 or 9, characterized in that the current reductant temperature T1 is measured by the temperature sensor when the level sensor signal is reliable, the time interval T from the level sensor signal reliable to the concentration sensor signal reliable being mapped according to the level L and the temperature T1.
- A machine or computer readable storage medium storing executable instructions that when executed enable the method of releasing a concentration sensor of any of claims 7 to 10 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810799807.4A CN110735695B (en) | 2018-07-18 | 2018-07-18 | SCR system, controller and control method thereof, and readable storage medium having the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810799807.4A CN110735695B (en) | 2018-07-18 | 2018-07-18 | SCR system, controller and control method thereof, and readable storage medium having the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110735695A true CN110735695A (en) | 2020-01-31 |
| CN110735695B CN110735695B (en) | 2022-09-27 |
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| CN201810799807.4A Active CN110735695B (en) | 2018-07-18 | 2018-07-18 | SCR system, controller and control method thereof, and readable storage medium having the same |
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| US20030033799A1 (en) * | 2001-08-09 | 2003-02-20 | Gerd Scheying | Exhaust gas treatment unit and measuring instrument for ascertaining a concentration of a urea-water solution |
| US20050207936A1 (en) * | 2004-03-18 | 2005-09-22 | Berryhill Ross C | System for diagnosing reagent solution quality |
| WO2006054457A1 (en) * | 2004-11-19 | 2006-05-26 | Nissan Diesel Motor Co., Ltd. | Liquid reducing agent state determination apparatus and concentration detection apparatus |
| JP2010159641A (en) * | 2009-01-06 | 2010-07-22 | Mazda Motor Corp | Method and device for determining state of urea-water solution and exhaust emission control device of engine |
| CN102007276A (en) * | 2008-06-27 | 2011-04-06 | 博世株式会社 | In-tank sensor rationality diagnostic technique and rationality diagnostic device |
| CN103547919A (en) * | 2011-05-26 | 2014-01-29 | 大陆汽车有限责任公司 | Method and device for operating an SCR system |
| CN105189960A (en) * | 2013-05-07 | 2015-12-23 | 天纳克汽车经营有限公司 | Reductant sensor system |
-
2018
- 2018-07-18 CN CN201810799807.4A patent/CN110735695B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030033799A1 (en) * | 2001-08-09 | 2003-02-20 | Gerd Scheying | Exhaust gas treatment unit and measuring instrument for ascertaining a concentration of a urea-water solution |
| US20050207936A1 (en) * | 2004-03-18 | 2005-09-22 | Berryhill Ross C | System for diagnosing reagent solution quality |
| WO2006054457A1 (en) * | 2004-11-19 | 2006-05-26 | Nissan Diesel Motor Co., Ltd. | Liquid reducing agent state determination apparatus and concentration detection apparatus |
| CN102007276A (en) * | 2008-06-27 | 2011-04-06 | 博世株式会社 | In-tank sensor rationality diagnostic technique and rationality diagnostic device |
| JP2010159641A (en) * | 2009-01-06 | 2010-07-22 | Mazda Motor Corp | Method and device for determining state of urea-water solution and exhaust emission control device of engine |
| CN103547919A (en) * | 2011-05-26 | 2014-01-29 | 大陆汽车有限责任公司 | Method and device for operating an SCR system |
| CN105189960A (en) * | 2013-05-07 | 2015-12-23 | 天纳克汽车经营有限公司 | Reductant sensor system |
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| CN110735695B (en) | 2022-09-27 |
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