WO2005042936A1 - 液体還元剤の濃度及び残量検出装置 - Google Patents
液体還元剤の濃度及び残量検出装置 Download PDFInfo
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- WO2005042936A1 WO2005042936A1 PCT/JP2004/012939 JP2004012939W WO2005042936A1 WO 2005042936 A1 WO2005042936 A1 WO 2005042936A1 JP 2004012939 W JP2004012939 W JP 2004012939W WO 2005042936 A1 WO2005042936 A1 WO 2005042936A1
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- Prior art keywords
- concentration
- remaining amount
- reducing agent
- liquid reducing
- vehicle
- Prior art date
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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]
-
- 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
-
- 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
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/007—Storing data relevant to operation of exhaust systems for later retrieval and analysis, e.g. to research exhaust system malfunctions
-
- 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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/05—Systems for adding substances into exhaust
-
- 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
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
- F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
-
- 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
- F01N2900/10—Parameters used for exhaust control or diagnosing said parameters being related to the vehicle or its components
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
- Y02T10/12—Improving ICE efficiencies
-
- 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
Definitions
- Liquid reducing agent concentration and remaining amount detection device Liquid reducing agent concentration and remaining amount detection device
- the present invention relates to a method for mounting a sensor that outputs a signal related to the concentration and the remaining amount of a liquid reducing agent on the basis of a heat transfer characteristic between two separated points on a moving vehicle,
- the present invention relates to a technology for securing both detection accuracy.
- Patent Document 1 As a catalyst purification system for removing nitrogen oxides (NOx) contained in engine exhaust, an exhaust purification device disclosed in Japanese Patent Application Laid-Open No. 2000-27627 (Patent Document 1) has been proposed.
- a reduction catalyst is provided in the exhaust system of the engine, and a reducing agent is injected and supplied upstream of the reduction catalyst to cause a catalytic reduction reaction between NOx and the reducing agent in the exhaust gas. NOx is converted into a harmless component.
- the reducing agent is stored in the storage tank in a liquid state at normal temperature, and the required amount corresponding to the engine operating state is injected and supplied from the injection nozzle.
- the reduction reaction uses ammonia having a good reactivity with NOx.
- liquid reducing agent t ⁇ ⁇
- liquid reducing agent t ⁇ ⁇
- Patent Document 1 JP-A-2000-27627
- the concentration and the remaining amount of the liquid reducing agent are detected based on the heat transfer characteristics between the two separated points.
- this sensor is mounted on a moving vehicle such as an automobile, the following problems will occur. That is, while the moving vehicle is running, the vehicle body constantly vibrates due to undulations on the road surface, etc., so that convection occurs in the liquid reducing agent in the storage tank.
- the present invention calculates the concentration of the liquid reducing agent only when the vehicle condition is stable, and calculates the remaining amount of the liquid reducing agent regardless of the vehicle condition. It is an object of the present invention to provide a liquid reducing agent concentration and remaining amount detection device (hereinafter referred to as a “detection device”) in which both the concentration and the remaining amount detection accuracy of the liquid reducing agent are ensured by the determination.
- a detection device a liquid reducing agent concentration and remaining amount detection device
- a signal related to the concentration and the remaining amount of the liquid reducing agent is provided in a storage tank in which the liquid reducing agent is stored, and based on heat transfer characteristics between two separated points.
- a device for detecting the concentration and the remaining amount of a liquid reducing agent comprising a sensor to output and a control device having a built-in computer, the control device outputs a measurement trigger every predetermined time after starting the engine, and When the stop time during which the vehicle continuously stops reaches a predetermined determination time, it is determined that the vehicle state is stable, while the measurement trigger is output and the vehicle state is stable.
- the convection of the liquid reducing agent immediately after the vehicle stops is closely related to the deceleration. Therefore, if the determination time is dynamically set according to the deceleration of the vehicle, the accuracy is high. A vehicle state determination can be performed.
- points corresponding to the result of determining the remaining amount of the liquid reducing agent based on the signal of the sensor force are sequentially integrated, and when the integrated value exceeds a predetermined value, the liquid reducing agent becomes empty. May be determined.
- the residual based on the signal from the sensor Even if the amount is determined to be “empty”, this is not reflected in the remaining amount determination result as it is, but the points are gradually integrated and the remaining amount becomes empty when the integrated value exceeds a predetermined value ⁇ Is determined to be. Therefore, even if noise or the like is superimposed on the signal from the sensor, no erroneous determination is made, and the accuracy of determining the remaining amount of the liquid reducing agent can be greatly improved.
- a concentration storage device for storing the concentration of the liquid reducing agent may be provided, and the concentration of the liquid reducing agent stored in the concentration storage device may be updated based on the calculated concentration of the liquid reducing agent. In this way, the concentration of the liquid reducing agent can be referred to at any time. Then, if a concentration display device for visually displaying the stored concentration of the liquid reducing agent or a first notification device for notifying that the concentration deviates from a predetermined range is provided, the display is performed. By appropriately performing operations such as replenishing the storage tank with the liquid reducing agent according to the contents or the notification operation, the concentration of the liquid reducing agent can be maintained within a predetermined range.
- a remaining amount storage device for storing the remaining amount of the liquid reducing agent is provided, and the remaining amount of the liquid reducing agent stored in the remaining amount storage device is updated according to the determination result of the remaining amount of the liquid reducing agent. You may. In this way, the remaining amount of the liquid reducing agent can be referred to at any time. If a second notification device is provided for notifying that the remaining amount of the liquid reducing agent becomes empty, the storage tank can be appropriately refilled with the liquid reducing agent according to the notification operation. Further, it is possible to prevent the engine operation from continuing with the liquid reducing agent being empty. The invention's effect
- the present invention if the state continues for a predetermined determination time after the vehicle stops, it is determined that the vehicle state has been stabilized. That is, while the vehicle is running or decelerating, acceleration is applied in multiple directions to the liquid reducing agent in the storage tank, causing convection. However, when the vehicle stops, the convection of the liquid reducing agent gradually decreases over time, and finally there is no convection. Therefore, in addition to whether or not the vehicle has stopped, whether or not the force has continued for the determination time By determining that the convection has been eliminated in the liquid reducing agent in the storage tank, it is possible to grasp indirectly and with high accuracy.
- the concentration of the liquid reducing agent is calculated based on the signal of the sensor force, while the signal from the sensor is output every time the measurement trigger is output. The remaining amount of the liquid reducing agent is determined based on this.
- FIG. 1 is a configuration diagram of an exhaust gas purification device provided with a detection device according to the present invention.
- FIG. 2 shows details of a sensor
- (A) is a detailed view of a detection unit
- (B) is an explanatory diagram of a detection principle.
- FIG. 3 is a block diagram of various functions constituting the detection device.
- FIG. 4 is a flowchart showing a measurement trigger output process.
- FIG. 5 is a flowchart showing a vehicle state determination process.
- FIG. 6 is a flowchart showing a process of updating the urea aqueous solution concentration and the remaining amount.
- FIG. 7 is a flowchart showing a remaining amount determination process.
- FIG. 8 is a flowchart showing a remaining point update process.
- FIG. 1 shows a configuration of an exhaust gas purification device provided with a detection device according to the present invention.
- the exhaust gas of the engine 10 is discharged from the exhaust manifold 12 into the atmosphere via an exhaust pipe 16 provided with a NOx reduction catalyst 14. More specifically, the exhaust pipe 16 is provided with three catalysts, an oxidation catalyst for nitric oxide (NO), a reduction catalyst for NOx, and a slip-type ammoxidation catalyst, in that order on the exhaust upstream side.
- An exhaust system is configured by disposing a temperature sensor, an oxygen sensor, and the like, but is not shown in detail.
- the liquid reducing agent stored in the storage tank 18 is injected and supplied with air via the reducing agent supply device 20 and the injection nozzle 22 to the exhaust gas upstream of the NOx reduction catalyst 14.
- the liquid reducing agent an aqueous urea solution is used in the present embodiment, but an aqueous ammonia solution and light oil, petroleum or gasoline containing hydrocarbon as a main component may be used.
- the urea aqueous solution is an aqueous solution in which solid or powdered urea is dissolved, and is sucked from a suction port 24 opened at a lower position near the bottom of the storage tank 18 and supplied through a supply pipe 26 to supply a reducing agent. It is supplied to the device 20.
- surplus one that does not contribute to the injection is returned to the inside through a return pipe 28 through a return pipe 30 and opened at an upper position of the storage tank 18. It is.
- the aqueous urea solution injected and supplied to the exhaust gas upstream of the NOx reduction catalyst 14 is hydrolyzed by exhaust heat and water vapor in the exhaust gas, and ammonia is easily generated. It is known that the generated ammonia reacts with NOx in the exhaust gas in the NOx reduction catalyst 14 and is purified by water and harmless gas.
- the storage tank 18 is provided with a sensor 32 that outputs a signal related to the concentration and the remaining amount of the urea aqueous solution. That is, the base 32A in which the circuit board is built is fixed to the top wall of the storage tank 18, and the detection unit 32B hangs down from the base 32A to the bottom of the storage tank 18.
- a heater A and a temperature sensor B are respectively disposed at two separated positions. Then, when the heater A is heated, a signal relating to the concentration and the remaining amount of the urea aqueous solution is output via the thermal characteristics transmitted to the temperature sensor B. More specifically, when the heater A is operated for a predetermined time t as shown in FIG. 2B, the temperature sensor B gradually reduces the temperature with a characteristic corresponding to the thermal conductivity of the urea aqueous solution. Each time the temperature rises.
- the concentration and the remaining amount of the aqueous urea solution can be detected according to the temperature rise characteristics when the heater is stopped, that is, the difference between the initial temperature and the peak temperature in the temperature sensor B.
- the temperature at the temperature sensor B gradually decreases and takes a time t to return to the temperature before the heater operation.
- the concentration and remaining amount of the urea aqueous solution can be detected at predetermined time intervals (t + t).
- the As the sensor 32 a sensor manufactured and sold by Mitsui Kinzoku Mining Co., Ltd. is known.
- the output signal of the sensor 32 is input to a control device 34 containing a computer.
- the control device 34 includes an engine control device 36 that performs various controls of the engine 10 and a CAN (controller).
- An engine speed signal, an induction switch signal, a vehicle speed signal, and the like are input via an area network. Then, in the control device 34, the ROM (Read
- measurement trigger output means 34A Based on the control program stored in the (Only Memory), as shown in FIG. 3, measurement trigger output means 34A, deceleration calculation means 34B, vehicle stop determination means 34C, stop time measurement means 34D, engine start determination means 34E, vehicle The state determining means 34F, the density calculating means 34G, the density updating means 34H, the density output means 341, the remaining amount determining means 3J, the remaining amount updating means 34K and the remaining amount outputting means 34L are realized respectively.
- the measurement trigger output means 34A is activated when the identification switch signal is turned on, and at a predetermined time (t + t) shown in FIG. Detection
- the deceleration calculating means 34B calculates the deceleration from the rate of change of the vehicle speed.
- the vehicle stop determination means 34C determines whether or not the vehicle has stopped based on the vehicle speed.
- the stop time measuring means 34D measures the stop time during which the vehicle continuously stops when the vehicle stop determining means 34C determines that the vehicle has stopped.
- the engine start determination means 34E determines whether or not the engine 10 is starting based on the engine speed.
- the vehicle state determination unit 34F determines the vehicle state based on the deceleration calculated by the deceleration calculation unit 34B, the stop time measured by the stop time measurement unit 34D, and the determination result by the engine start determination unit 34E. .
- the concentration calculation means 34G is configured to output a measurement trigger from the measurement trigger output means 34A and, based on a signal from the sensor 32 when the vehicle state determination means 34F determines that the vehicle state is stable. To calculate the urea aqueous solution concentration.
- the concentration updating means 34H updates the urea aqueous solution concentration stored in the memory as the concentration storage device based on the urea aqueous solution concentration calculated by the concentration calculating means 34G.
- the concentration output means 341 functions as a concentration display device in cooperation with the concentration meter 38, and outputs an operation signal to the concentration meter 38 which visually displays the urea aqueous solution concentration stored in the memory.
- the remaining amount determination unit 3J determines the remaining amount (presence or absence) of the aqueous urea solution based on the signal from the sensor 32.
- the remaining amount updating unit 34K updates the remaining amount of the urea aqueous solution stored in the memory as the remaining amount storage device based on the determination result by the remaining amount determining unit 3J.
- the remaining amount output means 34L functions as a second notification device in cooperation with the alarm device 40, and notifies when the remaining amount of the urea aqueous solution stored in the memory becomes 0 (empty). An operation signal is output to the alarm 40.
- step 1 the engine control device 36 sends the induction switch signal via CAN. Is read.
- step 2 it is determined whether or not the identification switch signal is ON, in other words, whether or not the engine 10 has been started. If the induction switch signal is ON, the process proceeds to Step 3 (Yes), while if the induction switch signal is OFF, the process returns to Step 1 (No).
- step 3 a measurement trigger is output.
- step 4 it is determined whether or not the force has passed a predetermined time (t + t) after outputting the measurement trigger.
- a measurement trigger is output every 1 2. Therefore, by monitoring the presence or absence of a measurement trigger, It is possible to ascertain whether or not the force has enabled the detection of the concentration and the remaining amount of the urea aqueous solution by the method 32.
- Vehicle state determination processing by deceleration calculation means 34B, vehicle stop determination means 34C, stop time measurement means 34D, engine start determination means 34E, and vehicle state determination means 34F is shown in FIG.
- An engine rotation speed signal is read from the engine control device 36 via the controller.
- step 12 it is determined whether the engine rotation speed is equal to or higher than the idle rotation speed. In other words, it is determined whether the engine 10 is starting or not. If the engine speed is equal to or higher than the idle speed, the process proceeds to step 13 (Yes). On the other hand, if the engine speed is lower than the idle speed, the process proceeds to step 21 (No), and a signal indicating that the vehicle is in an unstable state is output.
- the signal indicating the vehicle state is output to a predetermined area of the memory which can be referred to at any time.
- step 13 a vehicle speed signal is read from engine control device 36 via CAN.
- step 14 deceleration is calculated from the rate of change of the vehicle speed.
- step 15 the determination time for determining the vehicle stable state based on the deceleration is dynamically set.
- step 16 it is determined whether the vehicle has stopped based on the vehicle speed.
- vehicle is stopped is not limited to a state in which the vehicle is completely stopped, but also includes a concept including a substantially stopped state in which convection of the aqueous urea solution in the storage tank 18 is gradually reduced. If the vehicle has stopped, proceed to step 17 (Yes). On the other hand, if the vehicle is not stopped, the process proceeds to step 20 (No), and a signal indicating that the vehicle is in an unstable state is output.
- step 17 it is determined whether or not the force has been stopped and the force determination time has elapsed, in other words, whether or not the vehicle stopped state has continued for the determination time. If the determination time has elapsed after the vehicle has stopped, the process proceeds to step 18 (Yes), and a signal indicating that the vehicle is in a stable state is output. On the other hand, if the vehicle has stopped and the force determination time has not elapsed, the process proceeds to step 19 (No), and a signal indicating that the vehicle is in an unstable state is output. [0038] According to the strong vehicle state determination process, if the state continues for the determination time after the vehicle stops, a signal indicating that the vehicle is in a stable state is output.
- the urea aqueous solution in the storage tank 18 is subjected to acceleration in multiple directions, and convection occurs in the urea aqueous solution.
- the convection of the urea aqueous solution gradually decreases over time, and finally there is no convection. Therefore, in addition to determining whether the vehicle has stopped or not, by determining whether the state has continued for the determination time, it is indirectly determined that the urea aqueous solution in the storage tank 18 has no convection. It can be grasped accurately and accurately.
- the determination of high accuracy can be performed by dynamically setting the determination time according to the deceleration. .
- FIG. 6 shows a process of updating the urea aqueous solution concentration and the remaining amount by the concentration calculating unit 34G, the concentration updating unit 34H, the concentration outputting unit 341, the remaining amount determining unit 3J, the remaining amount updating unit 34K, and the remaining amount outputting unit 34L.
- step 31 it is determined whether or not the measurement trigger is being output. If the measurement trigger has been output, the process proceeds to step 32 (Yes), while if the measurement trigger has not been output, the process waits (No).
- step 32 the heating heater A of the sensor 32 for starting detection of the concentration and the remaining amount of the urea aqueous solution is operated for a predetermined time t.
- step 33 a signal indicating the vehicle state, that is, whether the vehicle is in a stable state or an unstable state, is read from the memory.
- step 34 it is determined whether the vehicle is in a stable state. If the vehicle is in a stable state, the process proceeds to step 35 (Yes), while if the vehicle is in an unstable state, the process proceeds to step 35.
- step 35 the urea aqueous solution concentration is calculated based on the temperature rise characteristic of the temperature sensor B when the heater A of the sensor 32 is operated.
- step 36 the urea aqueous solution concentration stored in the memory is updated based on the calculated urea aqueous solution concentration.
- a concentration signal is output to a concentration meter 38 for visually displaying the concentration of the urea aqueous solution stored in the memory.
- the urea aqueous solution deviates from the predetermined range.
- a beeper alarm 40 for notifying that the required NOx purification efficiency may not be obtained may be activated.
- the alarm 40 and the control for activating the alarm 40 implement a first notification device.
- step 38 a subroutine for performing the remaining amount determination process shown in FIG. 7 to determine whether the remaining amount of the urea aqueous solution in the storage tank 18, that is, whether or not the urea aqueous solution is empty, is deleted.
- step 39 the remaining amount of the aqueous urea solution stored in the memory is updated based on the result of the determination of the remaining amount of the aqueous urea solution.
- step 40 when the urea aqueous solution becomes empty, an alarm 40 for notifying that it should be replenished is operated.
- step 41 the remaining amount points stored in the memory are read.
- the “remaining point” refers to the detection of the remaining amount of the aqueous urea solution in the storage tank 18 in consideration of the possibility that noise or the like may be superimposed on the signal from the sensor 32 and the remaining amount may not be detected normally. This is a threshold value for improving accuracy and is stored in the memory.
- step 42 it is determined whether or not the force whose remaining point is equal to or more than a predetermined value. If the remaining point is equal to or more than the predetermined value, the process proceeds to step 43 (Yes), and it is determined that the remaining amount is “empty”. On the other hand, if the remaining point is less than the predetermined value, the process proceeds to step 44 (No), and it is determined that the remaining amount is “present”.
- step 51 it is determined whether the measurement trigger is output or not. If the measurement trigger has been output, the process proceeds to step 52 (Yes), while if the measurement trigger has not been output, the process waits (No).
- step 52 the remaining amount of the urea aqueous solution in the storage tank 18, that is, the urea aqueous solution becomes empty, based on the temperature rise characteristic of the temperature sensor B when the heater A of the sensor 32 is operated. Is determined.
- step 53 a remaining point is read from the memory.
- step 54 the vehicle state is read from the memory.
- step 55 it is determined whether the vehicle is in a stable state. If the vehicle is in a stable state, the process proceeds to step 56 (Yes), while if the vehicle is in an unstable state, the process proceeds to step 59 (No).
- step 56 a branching process is performed according to the remaining amount of the aqueous urea solution. If the urea aqueous solution is empty, the process proceeds to step 57 (Yes), and a point as a predetermined value is added to the remaining amount point. On the other hand, if the aqueous urea solution is not empty, the process proceeds to step 58 (No), and the remaining amount point is cleared.
- step 59 a branching process is performed according to the remaining amount of the urea aqueous solution. If the urea aqueous solution is empty, the process proceeds to step 60 (Yes), and the b point as a predetermined value is added to the remaining amount point. On the other hand, if the urea aqueous solution is not empty, the process proceeds to step 61 (No), and the c point as a predetermined value is added to the remaining amount point.
- step 62 the remaining points stored in the memory are updated with the updated remaining points.
- the heater A of the sensor 32 is operated for a predetermined time t every time the measurement trigger is output. And the vehicle is in a stable state
- the urea aqueous solution concentration is calculated based on the temperature rise characteristics of the temperature sensor B, the urea aqueous solution concentration in the memory is updated, and the urea aqueous solution concentration in the memory is displayed on the densitometer 38. For this reason, the urea aqueous solution concentration is updated only when the vehicle is in a stable state, in other words, when there is no convection in the urea aqueous solution, so that the detection accuracy of the urea aqueous solution concentration caused by the convection is reliably prevented from lowering. can do.
- the urea aqueous solution concentration indicated on the concentration meter 38 is out of the predetermined range, or when the alarm 40 is activated, work such as replenishing the storage tank 18 with the urea aqueous solution is performed. By doing so, the urea aqueous solution concentration is maintained within a predetermined range, and the required NOx purification efficiency can be maintained.
- the sensor 32 has a characteristic that the remaining amount is not erroneously detected even if there is convection in the urea aqueous solution, but there is a possibility that noise or the like is superimposed on the signal and the remaining amount is erroneously detected. . However, even if the remaining amount is determined to be “empty” based on the signal from the sensor 32, this is not reflected in the remaining amount determination result as it is, the remaining amount point is gradually added, and the integrated value is calculated. It is determined that the remaining amount is “empty” only when the amount becomes equal to or more than the predetermined value.
- the alarm 40 is activated, so that the driver or the like can recognize that the aqueous urea solution should be refilled.
- the remaining point written in the EEPROM or the like may be read out to the memory while the engine 10 is started. In this way, the remaining points before the start of the engine 10 are taken over, so that every time the engine 10 is started, it is not necessary to update the remaining points and start the operation. Therefore, even immediately after the start of the engine 10, the remaining amount of the urea aqueous solution can be determined with high accuracy.
- a sensor that outputs a signal relating to the concentration and the remaining amount of the liquid reducing agent based on the heat transfer characteristic between two separated points is provided for the moving vehicle.
- a signal that may cause an erroneous detection is not reflected, both the concentration and the detection accuracy of the remaining amount can be secured. For this reason, the concentration of the liquid reducing agent is inappropriate, or the operation of the engine when the liquid reducing agent is empty can be suppressed, and the NOx purification efficiency can be maintained at an excellent level.
- the detection device calculates the concentration of the liquid reducing agent only when the vehicle state is stable, and determines the remaining amount of the liquid reducing agent regardless of the vehicle state. Therefore, even if a mobile vehicle is equipped with a sensor that outputs a signal related to the concentration and remaining amount of the liquid reducing agent based on the heat transfer characteristics between the two separated points, the concentration and remaining amount of the liquid reducing agent can be detected. Accuracy can be secured together, and it is extremely useful.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/575,476 US7499814B2 (en) | 2003-10-31 | 2004-09-06 | Apparatus for detecting concentration and remaining amount of liquid reducing agent |
EP04787643A EP1681444A4 (en) | 2003-10-31 | 2004-09-06 | DEVICE FOR DETECTING THE CONCENTRATION AND REMAINING QUANTITIES OF LIQUID REDUCTION |
Applications Claiming Priority (2)
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JP2003373535A JP3687917B2 (ja) | 2003-10-31 | 2003-10-31 | 液体還元剤の濃度及び残量検出装置 |
JP2003-373535 | 2003-10-31 |
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WO2005042936A1 true WO2005042936A1 (ja) | 2005-05-12 |
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PCT/JP2004/012939 WO2005042936A1 (ja) | 2003-10-31 | 2004-09-06 | 液体還元剤の濃度及び残量検出装置 |
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US (1) | US7499814B2 (ja) |
EP (1) | EP1681444A4 (ja) |
JP (1) | JP3687917B2 (ja) |
CN (1) | CN100390383C (ja) |
WO (1) | WO2005042936A1 (ja) |
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US7467512B2 (en) | 2003-10-28 | 2008-12-23 | Nissan Diesel Motor Co., Ltd. | Exhaust gas purifying apparatus and exhaust gas purifying method of an engine |
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US8033096B2 (en) | 2005-06-10 | 2011-10-11 | Nissan Diesel Motor Co., Ltd. | Exhaust gas purifying apparatus for engine |
Also Published As
Publication number | Publication date |
---|---|
CN1875174A (zh) | 2006-12-06 |
EP1681444A4 (en) | 2007-10-17 |
US20070204677A1 (en) | 2007-09-06 |
JP2005133695A (ja) | 2005-05-26 |
JP3687917B2 (ja) | 2005-08-24 |
CN100390383C (zh) | 2008-05-28 |
US7499814B2 (en) | 2009-03-03 |
EP1681444A1 (en) | 2006-07-19 |
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