CN110735695B - 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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- CN110735695B CN110735695B CN201810799807.4A CN201810799807A CN110735695B CN 110735695 B CN110735695 B CN 110735695B CN 201810799807 A CN201810799807 A CN 201810799807A CN 110735695 B CN110735695 B CN 110735695B
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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
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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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
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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
- 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
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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
- F01N2900/18—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
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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
- F01N2900/18—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
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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
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)
- Exhaust Gas After Treatment (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The application provides a controller for controlling and releasing a concentration sensor in an SCR system, which is 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 the controller is 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; 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. The method and the device can reduce the time error of pre-estimation of the concentration sensor in the prior art.
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 exhaust pipe by 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, under some circumstances, it is inevitable that the reducing agent becomes a solid-liquid mixed state or an all solid state. The volume of the reducing agent changes in the solidification process, 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, it is necessary to provide a heater in the tank of the reducing agent so that the solid-solidified reducing agent becomes liquid again, and the data measured by the concentration sensor is sufficiently reliable after the transition from the solid state to the liquid state is completed. Therefore, there is a need for a method to determine the exact point in time at which the concentration sensor becomes liquid. In the conventional method, after a heater enters a heating state, under a specific temperature condition, the time from the beginning of the heating state to the complete liquefaction of a reducing agent is obtained according to empirical curve mapping, so that the time point of the final completion of the liquefaction is estimated. However, the conventional method does not consider the time required for the liquefaction of the reducing agent by different liquid levels, and therefore the conventional method is not accurate in estimation.
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 object, the present application provides a controller for controlling release of a concentration sensor in an SCR system, which is configured to exchange signals with at least a heater, a level sensor, and a concentration sensor in a reducing agent tank of the SCR system, the controller being 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, wherein the reliable signal of the liquid level sensor means that the liquid level sensor can actually measure the liquid level;
mapping a time interval t from the reliability of the liquid level sensor signal to the reliability of a concentration sensor signal according to the liquid level L, wherein the reliability of the concentration sensor signal is the concentration of the reducing agent which can be truly reacted by the concentration sensor;
after time t the release of the concentration sensor is controlled.
In order to achieve the above object, the present application further provides an SCR system including a reducing agent tank, a controller, and a heater, a liquid level sensor, and a concentration sensor disposed in the reducing agent tank, wherein the controller has the features of the controller described above.
To achieve the above object, the present application also provides a method for controlling a concentration sensor in a release SCR system, characterized by comprising the steps of:
starting a heater in the SCR system for heating;
judging whether a signal of a liquid level sensor in the SCR system is reliable, wherein the reliable signal of the liquid level sensor means that the liquid level sensor can actually measure the liquid level;
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 a signal of the liquid level sensor to the normal work of the concentration sensor, wherein the reliability of the signal of the concentration sensor is the concentration of the reducing agent which can be truly reacted by the concentration sensor;
releasing the concentration sensor after time t.
To achieve the above object, the present application further provides a machine or computer readable storage medium storing executable instructions that, when executed, enable a method of controlling a release of a concentration sensor in an SCR system as described above.
By using the SCR system, the controller, the control method and the readable storage medium thereof, the liquid level is taken into consideration of the time for completing liquefaction of the reducing agent in a freezing state, so that the relatively accurate time point for completing 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 an embodiment of an 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 one embodiment 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 illustrating an embodiment of an SCR (selective catalytic reduction) system according to the present application. The SCR system of this application includes reductant case 11 and sets up heater 12, level sensor 13, concentration sensor 14 and temperature sensor 16 in the reductant case, and the SCR control system still includes controller 15. The reducing agent tank 11 has a quantity of reducing agent and a level sensor 13 is provided to measure the reducing agent level. The concentration sensor 14 is provided on one side of the reducing agent tank 11, and is generally located at a distance from the heater 12 that is greater than the distance from the level sensor 13 to the heater 12. The temperature sensor 16 may measure the temperature of the reducing agent. The controller 15 can exchange signals with the heater 12, the liquid 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 instrument, 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, and 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. Depending on the liquid level and the defined shape of the reducing agent tank, the amount of reducing agent can be determined in particular. When the signal is reliable, the level sensor 13 can determine and estimate when its signal is reliable in the following manner. One mode is that firstly, the controller 15 controls the temperature sensor 16 to obtain the temperature signal T of the reducing agent, the time interval T1 from the beginning of heating the heater 12 to the time when the signal of the liquid level sensor 13 is reliable is mapped according to the temperature T, and the signal of the liquid level sensor 13 is judged to be reliable after the time T1. In another mode, the liquid level sensor 13 sends 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 characteristics of the ultrasonic signal in the reducing agent, the signal reliability of the liquid level sensor 13 is judged. And if the signal of the current liquid level sensor 13 is judged to be unreliable, continuously sending or intermittently sending an ultrasonic signal, and judging that the signal of the liquid level sensor 13 is reliable when the ultrasonic signal of the liquid level sensor 13 accords with the characteristics of the ultrasonic signal in the reducing agent.
In use, when the SCR system detects that the reducing agent is in a frozen state, whether in a solid-liquid mixed state or a fully solid state, it is considered to be in the frozen state in the present application, in which 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 perform heating, and it is determined whether or not the signal of the level sensor 13 is reliable. When the signal of the liquid level sensor 13 is reliable, the reducing agent liquid level L is obtained according to the measurement of the liquid level sensor 13. Referring to fig. 2, according to the liquid level L of the reducing agent and the corresponding relationship between the signal reliability of the liquid level sensor 13 and the signal reliability of the concentration sensor 14 at a specific temperature until the reducing agent is completely liquefied, that is, the time interval t between the signal reliability of the liquid level sensor 13 and the signal reliability of the concentration sensor 14 is mapped, and then the controller 16 controls to release the concentration sensor 14 after the signal reliability of the liquid level sensor 13 passes through the time interval t, so that the signal of the concentration sensor 14 can be used. The above-mentioned acquisition of the current temperature of the reducing agent can be found from a test by the temperature sensor 16 or from a case where the reducing agent is in a solid-liquid mixed state, and in general, the temperature of the solid-liquid mixed state of the liquid is relatively constant, for example, the temperature of the solid-liquid mixed state of water is 0 ℃.
The mapping relations can be obtained through empirical actual tests.
Referring to fig. 3, a flowchart of a method for controlling a concentration sensor in a SCR system according to the present application is shown, and in the present embodiment, the following is specifically explained.
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 a signal of a liquid level sensor in the SCR system is reliable or not;
in the step S120, the liquid level L is measured under the state that 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 determined to be reliable after the time T1. The other mode can also be used, after the heater is controlled to start heating, the liquid level sensor continuously emits ultrasonic waves to test, and when the ultrasonic signals of the liquid level sensor accord with the ultrasonic signal characteristics in the reducing agent, the signals of the liquid level sensor are judged to be reliable.
The time interval from the reliability of the level sensor signal to the reliability of the concentration sensor signal after the reliability of the level sensor signal can also be obtained in the following manner. 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 what is presently considered to be the most practical and preferred embodiment, and it is to be understood that the invention is not limited to the disclosed embodiment, but, on the contrary, is intended to cover various modifications, equivalents, additions and substitutions within the spirit and scope of the present application as defined by the appended claims.
Claims (11)
1. A controller for controlling release of a concentration sensor in an SCR system, the controller configured to exchange signals with at least a heater, a level sensor, and 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, wherein the reliable signal of the liquid level sensor means that the liquid level sensor can actually measure the liquid level;
mapping a time interval t from the reliability of the liquid level sensor signal to the reliability of a concentration sensor signal according to the liquid level L, wherein the reliability of the concentration sensor signal is the concentration of the reducing agent which can be truly reacted by the concentration sensor;
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 a temperature sensor of the SCR system 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.
6. SCR system (10), characterized by comprising a reducing agent tank (11), a controller (15) according to any one of claims 1 to 5, and a heater (12), a level sensor (13), a concentration sensor (14) arranged in the reducing agent tank (11).
7. A method of controlled release of a concentration sensor in an SCR system, characterized by the steps of:
starting a heater in the SCR system for heating;
judging whether a signal of a liquid level sensor in the SCR system is reliable, wherein the reliable signal of the liquid level sensor means that the liquid level sensor can actually measure the liquid level;
measuring a liquid level L in a state that a 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 liquid level sensor signal to the reliability of the concentration sensor signal, wherein the reliability of the concentration sensor signal is the concentration of the reducing agent which can be truly reacted by the concentration sensor;
releasing the concentration sensor after time t.
8. The method of claim 7, wherein the level sensor signal is determined to be reliable by measuring a temperature T of the reductant according to a temperature sensor in the SCR system, mapping a time interval T1 from the heater starting to heat to the level sensor signal to be reliable according to the temperature T, and determining the level sensor signal to be reliable after time T1.
9. The method for controlled release of a concentration sensor in an SCR system as recited in claim 7, wherein the level sensor signal is judged to be reliable by the level sensor continuously emitting ultrasonic waves for test after the heater is controlled to start heating until the ultrasonic signal of the level sensor meets the ultrasonic signal characteristic in the liquid reducing agent.
10. Method for the controlled release of a concentration sensor in an SCR system according to claim 8 or 9, characterized in that the current reductant temperature T1 is measured by a temperature sensor in the SCR system 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.
11. A computer readable storage medium storing executable instructions capable, when executed, of implementing a method of controlling a concentration sensor in a release SCR system as claimed in any one of claims 7 to 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810799807.4A 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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| Application Number | Priority Date | Filing Date | Title |
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| CN201810799807.4A 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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| CN110735695A CN110735695A (en) | 2020-01-31 |
| CN110735695B true CN110735695B (en) | 2022-09-27 |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10139142A1 (en) * | 2001-08-09 | 2003-02-20 | Bosch Gmbh Robert | Exhaust gas treatment unit and measuring device for determining a concentration of a urea-water solution |
| US7776265B2 (en) * | 2004-03-18 | 2010-08-17 | Cummins Filtration Ip, Inc. | System for diagnosing reagent solution quality |
| JP4327072B2 (en) * | 2004-11-19 | 2009-09-09 | 日産ディーゼル工業株式会社 | Liquid reductant discrimination system for exhaust purification system |
| JP5152912B2 (en) * | 2008-06-27 | 2013-02-27 | ボッシュ株式会社 | Rationality diagnosis method and rationality diagnosis device for sensor in tank |
| JP5126070B2 (en) * | 2009-01-06 | 2013-01-23 | マツダ株式会社 | Method and apparatus for determining the state of urea water and engine exhaust purification system |
| DE102011103272B4 (en) * | 2011-05-26 | 2014-05-22 | Continental Automotive Gmbh | Method and apparatus for operating an SCR system |
| JP6307595B2 (en) * | 2013-05-07 | 2018-04-04 | テンネコ・オートモティブ・オペレーティング・カンパニー・インコーポレイテッド | Recirculating exhaust treatment fluid system |
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