Classifications

• • 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
  • 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
  • F01N2610/148—Arrangement of sensors
• • 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
  • F01N2900/1811—Temperature
• • 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
  • 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

• the present invention relates to a device and a method for controlling measuring concentration of a reductant solution in a Selective Catalytic Reduction (SCR) system of a vehicle. More specifically, it relates to accurate measurement of concentration or quality of the reductant solution.
• SCR Selective Catalytic Reduction
• SCR system plays an important role in controlling emission of exhaust gases.
• Reductant solutions such as ad-blue R , ammonia, diesel exhaust fluid, or urea is sprayed selectively in the exhaust path to reduce the nitrogen oxides in the exhaust gas.
• the quality of the reductant solutions must be good to ensure effective reduction of nitrogen oxide and control of pollution.
• the quality or the concentration is reduced because of various reasons like ageing or adulteration.
• concentration of the reductant solution has to be measured periodically and corrective action should be taken when it is found to be less. Bubble formation affects the accuracy of concentration measurement of the reductant solution. If the measurement is done incorrectly, then the vehicle speed or other functionalities could be limited by the ECU of the vehicle to ensure safety.
• W016085307A1 discloses a concentration measurer for measuring the urea concentration by detecting waves transmitted through urea water.
• a shielding member is arranged to encompass the concentration measurement area.
• the shielding member has a plurality of through-holes capable of preventing bubbles within the urea water from infiltrating into the concentration measurement area.
• the invention discloses a device for measuring concentration of a reductant solution in a selective catalytic reduction (SCR) system of a vehicle.
• SCR selective catalytic reduction
• the SCR system comprises at least one injector to inject a reductant solution from a tank to an exhaust path of the vehicle.
• the device comprises an interface to receive ambient pressure from a pressure sensor, and temperature of the reductant solution from a temperature sensor.
• the device also has a processor to determine the possibility of formation of bubbles in the tank based on the ambient pressure and the temperature of the reductant solution for controlling concentration measurement of the reductant solution.
• the processor computes a saturated vapor pressure of the reductant solution based on the temperature of the reductant solution.
• the processor compares the saturated vapor pressure of the reductant solution with the ambient pressure to determine the possibility of formation of bubbles in the tank.
• the processor selectively accepts output of a concentration sensor to evaluate concentration of the reductant solution based on the possibility of formation of bubbles in the tank.
• the processor stops using output of the concentration sensor when the possibility of formation of bubbles in the tank is high.
• the invention also discloses a method of measuring concentration of a reductant solution in a selective catalytic reduction (SCR) system of a vehicle.
• SCR system comprises one or more injectors to inject a reductant solution from a tank to an exhaust path of the vehicle.
• the method involves receiving ambient pressure from a pressure sensor, and temperature of the reductant solution from a temperature sensor. Possibility of formation of bubbles in the tank is determined based on the ambient pressure, and the temperature of the reductant solution for controlling concentration measurement of the reductant solution.
• Saturated vapor pressure of the reductant solution is computed based on the temperature of the reductant solution.
• Saturated vapor pressure of the reductant solution is compared with the ambient pressure to determine the possibility of formation of bubbles in the tank.
• Output of a concentration sensor is selectively used to evaluate the concentration of the reductant solution based on the possibility of formation of bubbles in the tank. Output of the concentration sensor is ignored selectively when the possibility of formation of bubbles in the tank is high.
• Figure 1 illustrates a schematic block diagram of a SCR system of a vehicle, according to an embodiment of the present invention
• Figure 2 illustrates a schematic block diagram of a device for measuring concentration of a reductant solution in a SCR system of a vehicle, according to an embodiment of the present invention.
• Figure 3 illustrates a flow chart explaining a method for measuring concentration of a reductant solution in a SCR system of a vehicle, according to an embodiment of the present invention.
• FIG. 1 illustrates a schematic block diagram of a SCR system of a vehicle, according to an embodiment of the present invention.
• the SCR system 100 of the vehicle comprises one or more injectors 20 to inject a reductant solution from a tank 30 to an exhaust path 40 of the vehicle.
• the reductant solution can be urea, ammonia, diesel exhaust fluid, AdBlue® solution, etc.
• the quality or concentration of the reductant solution is very important for controlling pollution.
• the concentration of the reductant solution is measured using various concentration measurement sensors 50 such as ultrasonic concentration measurement sensor 50.
• FIG. 2 illustrates a schematic block diagram of a device for measuring concentration of a reductant solution in a SCR system of a vehicle, according to an embodiment of the present invention.
• the device 10 can be a dosing control unit (DCU) 10 that is used for controlling injection of the reduction solution on the exhaust path 40 by the injector 20.
• the device 10 can also be an electronic control unit (ECU) 10, which also controls the dosing of the reductant solution.
• ECU electronice control unit
• the device 10 of the present invention avoids erroneous measurement of the concentration of the reductant solution. The details are explained in the following paragraphs.
• the device 10 comprises an interface 12 through which various signals are received, and control signal from the device 10 is sent to various actuators like injectors 20, etc.
• the device 10 receives ambient pressure from a pressure sensor 14, and temperature of the reductant solution from a temperature sensor 16.
• the device 10 comprises a processor 14, which determines the possibility of formation of bubbles in the tank 30 based on the ambient pressure, and the temperature of the reductant solution in the tank 30 for controlling the concentration measurement of the reductant solution. Determination of bubble formation in the tank 30 is explained in detail in the below paragraphs.
• the processor 14 computes a saturated vapor pressure (SVP) of the reductant solution based on the temperature of the reductant solution.
• the processor 14 the compares the saturated vapor pressure of the reductant solution with the ambient pressure to determine the possibility of formation of bubbles in the tank 30.
• the processor 14 selectively accepts the output of the concentration sensor 50 based on the possibility of formation of bubbles in the tank 30.
• the processor 14 determines that the possibility of bubble formation is high in the tank 30.
• the processor 14 ignores the output of the concentration sensor 50 or stops using the output of the concentration sensor 50.
• the concentration measurement is not considered when the bubble formation is high. This is done to avoid erroneous measurement of the concentration due to the bubbles.
• the accuracy of concentration measurement is improved considerably. Therefore, there are no inconvenience or problems such as wrongly entering to "limp home mode" or reduction of vehicle functionalities, vehicle speed, etc.
• the system does not require any additional expensive sensors, hardware for avoiding inaccurate measurement of the concentration due to bubbles. Hence, cost optimization and customer satisfaction are improved remarkably.
• FIG. 3 illustrates a flow chart explaining a method for measuring concentration of a reductant solution in a SCR system of a vehicle, according to an embodiment of the present invention.
• the SCR system 100 comprises an injector 20 to inject a reductant solution from a tank 30 to an exhaust path 40 of the vehicle.
• the method is executed by a concentration measurement device 10 such as a dosing control unit or an ECU.
• the method involves receiving ambient pressure from a pressure sensor 14, and temperature of the reductant solution from a temperature sensor 16 at step 310 by a processor 14 of the concentration measurement device 10.
• possibility of formation of bubbles in the tank 30 is determined based on the ambient pressure, and the temperature of the reductant solution for controlling concentration measurement of the reductant solution. This step is explained in detail in the following paragraphs.
• Saturated vapor pressure (SVP) of the reductant solution is computed based on the temperature of the reductant solution by the processor 14.
• Saturated vapor pressure (SVP) of the reductant solution is compared with the ambient pressure to determine the possibility of formation of bubbles in the tank 30.
• Output of a concentration sensor 50 is selectively used to measure concentration of the reductant solution based on the possibility of formation of bubbles in the tank 30.
• the processor 14 selectively ignores the output of the concentration sensor 50 when the possibility of formation of bubbles in the tank 30 is high. As a result, incorrect measurement of the concentration of the reductant solution due to the bubbles is avoided. Hence, inconvenience or problems such as wrongly entering to "limp home mode" or reduction of vehicle functionalities, vehicle speed, etc., are avoided. Further, the system does not require any additional expensive sensors, hardware for avoiding inaccurate measurement of the concentration of the reductant solution.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Health & Medical Sciences (AREA)
• Toxicology (AREA)
• Exhaust Gas After Treatment (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=77300938

Family Applications (1)

Country Status (3)

Citations (5)

• 2021
  • 2021-07-13 DE DE112021003984.9T patent/DE112021003984T5/de active Pending
  • 2021-07-13 WO PCT/IB2021/056273 patent/WO2022023852A1/en active Application Filing
  • 2021-07-13 CN CN202180047968.8A patent/CN115803512A/zh active Pending

Patent Citations (5)

Also Published As

Similar Documents

Legal Events