KR20200068585A - Method for detecting incorrect refueling of a storage container in a motor vehicle - Google Patents

Method for detecting incorrect refueling of a storage container in a motor vehicle Download PDF

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KR20200068585A
KR20200068585A KR1020190155090A KR20190155090A KR20200068585A KR 20200068585 A KR20200068585 A KR 20200068585A KR 1020190155090 A KR1020190155090 A KR 1020190155090A KR 20190155090 A KR20190155090 A KR 20190155090A KR 20200068585 A KR20200068585 A KR 20200068585A
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replenishment
sound velocity
detected
storage container
urea
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KR1020190155090A
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얀 미힐 호프만
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로베르트 보쉬 게엠베하
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • 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]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G01N29/024—Analysing fluids by measuring propagation velocity or propagation time of acoustic waves
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/12—Other sensor principles, e.g. using electro conductivity of substrate or radio frequency
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • 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
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • F01N2610/1413—Inlet and filling arrangements therefore
    • 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
    • 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
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/01—Indexing codes associated with the measuring variable
    • G01N2291/011—Velocity or travel time
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/022—Liquids
    • G01N2291/0228—Aqueous liquids
    • 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
    • Y02T10/24—
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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Abstract

The present invention relates to a method for detecting incorrect replenishment of a storage container for liquids, especially for aqueous urea solutions, in a vehicle. A sound velocity in a liquid is determined, and an incorrect replenishment is detected when a sound velocity deviates from an expected value.

Description

자동차 내 저장 용기의 잘못된 보충을 검출하기 위한 방법{METHOD FOR DETECTING INCORRECT REFUELING OF A STORAGE CONTAINER IN A MOTOR VEHICLE}METHOD FOR DETECTING INCORRECT REFUELING OF A STORAGE CONTAINER IN A MOTOR VEHICLE

본 발명은, 자동차 내 저장 용기의 잘못된 보충을 검출하기 위한 방법에 관한 것이다.The present invention relates to a method for detecting false replenishment of a storage container in an automobile.

자동차 공학 분야에서는 요소 수용액의 계량 주입에 의해 질소 산화물을 환원시키기 위한, 이하에서 SCR 촉매 컨버터로서 지칭되는 선택적 환원촉매 컨버터가 공지되어 있다.In the field of automotive engineering, a selective reduction catalyst converter, hereinafter referred to as an SCR catalytic converter, for reducing nitrogen oxides by metered injection of an aqueous urea solution is known.

상기 요소 수용액은 저장 용기 내에 보관되고, 계량공급 시스템에 의해 내연기관의 배기 매니폴드 내로 계량 주입된다. 용액에 함유된 요소는 촉매 컨버터 내에서 질소 산화물과 반응하여 NH3로 변환된 후에 질소 산화물을 질소로 환원한다. 이와 같은 선택적 촉매 환원을 위해, 규정된 배기가스 한계값을 준수하기 위해서는 촉매 컨버터에 NH3가 충분히 공급되어야 한다.The aqueous urea solution is stored in a storage container and metered into the exhaust manifold of the internal combustion engine by a metering supply system. The urea contained in the solution reacts with nitrogen oxides in a catalytic converter to convert it to NH3 and then reduce the nitrogen oxides to nitrogen. For the selective catalytic reduction, NH3 must be sufficiently supplied to the catalytic converter in order to comply with the prescribed exhaust gas limit value.

그렇기 때문에, 현재의 배기가스 관류 법규는 환원제의 질적 및 양적 모니터링을 요구한다.As such, current exhaust perfusion regulations require qualitative and quantitative monitoring of reducing agents.

통상적으로, 요소 수용액 및 디젤 연료용 주입 노즐은 서로 가까이 배치된다. 운전자의 오조작 시, 급유 과정에서 운전자가 요소 수용액용 저장 용기 내로 연료액을 주입하는 상황이 발생할 수 있다.Typically, the urea aqueous solution and the injection nozzles for diesel fuel are arranged close to each other. In the event of a driver's misoperation, a situation in which a driver injects fuel liquid into a storage container for an aqueous solution of urea in the refueling process may occur.

또한, 운전자가 저품질의 요소 수용액을 보충할 수 있는 위험도 존재한다. 특히, 지정된 수준보다 더 낮은 농도의 요소 수용액을 보충하는 것이 문제가 된다.There is also a risk that the driver can replenish a low-quality aqueous solution of urea. In particular, it is a problem to supplement the aqueous solution of urea with a concentration lower than the specified level.

또한, 요소 수용액의 품질을 초음파 센서에 의해 모니터링하는 방법 및 장치도 공지되어 있다. 이 초음파 센서는, 규정된 측정 거리에 걸쳐 초음파의 통과 시간을 측정한다. 측정된 통과 시간과 기지의 측정 거리를 토대로 센서에서 음속이 계산된다. 매질의 현재 온도와 연계하여 요소 농도가 추론될 수 있다.In addition, methods and apparatus for monitoring the quality of aqueous urea solutions by ultrasonic sensors are also known. This ultrasonic sensor measures the passing time of ultrasonic waves over a prescribed measurement distance. The sound velocity is calculated by the sensor based on the measured passing time and the known measuring distance. Urea concentration can be inferred in conjunction with the current temperature of the medium.

그에 비해, 독립 청구항의 특징들을 갖는 본 발명에 따른 방법은, 예를 들어 잘못 보충된 액체, 예컨대 디젤 연료가 확실하고 간단하게 검출될 수 있다는 장점을 갖는다. 특히, 요소 수용액보다 명백히 더 낮거나 더 높은 음속을 갖는 모든 액체가 확실하게 검출될 수 있다.On the contrary, the method according to the invention with the features of the independent claims has the advantage that, for example, a liquid that is incorrectly replenished, such as diesel fuel, can be reliably and simply detected. In particular, any liquid having a sound velocity that is clearly lower or higher than the aqueous urea solution can be reliably detected.

이는, 자동차 내에서 액체용의, 특히 요소 수용액용의 저장 용기의 잘못된 보충을 검출하기 위한 방법에서, 액체 내의 음속이 결정되고, 이 음속이 예상된 값으로부터 벗어날 때 잘못된 보충이 검출됨으로써, 달성된다.This is achieved in a method for detecting a false replenishment of a storage container for liquids, especially for aqueous urea solution in a motor vehicle, by determining the sound velocity in the liquid and detecting the wrong replenishment when the sound velocity deviates from the expected value. .

음속이 제1 임계값과 제2 임계값 사이에 놓이는 경우, 잘못된 보충의 매우 확실한 검출이 도출된다. 이 경우, 저품질의 요소 수용액이 보충된 것으로 추정할 수 있다.When the speed of sound lies between the first threshold and the second threshold, a very reliable detection of false replenishment is derived. In this case, it can be estimated that the low-quality urea aqueous solution is supplemented.

제2 임계값 미만의 음속이 검출되면, 디젤 연료의 잘못된 보충이 검출된다.If a sound velocity below the second threshold is detected, a false replenishment of diesel fuel is detected.

음속이 어느 값 범위 내에 놓여 있는지를 체크함으로써, 잘못된 보충의 유형을 검출할 수 있다. 다시 말해, 디젤 연료가 보충되었는지 아니면 지나치게 낮은 농도의 요소 수용액이 보충되었는지가 구별될 수 있다.By checking which value range the sound velocity lies within, it is possible to detect the type of false replenishment. In other words, it can be distinguished whether diesel fuel is replenished or an excessively low concentration of urea aqueous solution is replenished.

온도가 임계값보다 높은 경우에, 잘못된 보충의 존재 여부의 체크가 수행되는 것이 특히 바람직하다. 상기 임계값은, 디젤 연료의 음속이 물의 음속보다 더 낮도록 선택되었다. 바람직하게는 이를 위해 요소 수용액의 온도가 이용된다. 대안적으로, 요소 수용액의 온도를 특징짓는 온도도 측정되고 이용될 수 있다.In the case where the temperature is higher than the threshold value, it is particularly preferable that a check is made for the presence of erroneous replenishment. The threshold was selected such that the speed of sound of the diesel fuel was lower than that of water. Preferably for this purpose the temperature of the aqueous urea solution is used. Alternatively, the temperature characterizing the temperature of the aqueous urea solution can also be measured and used.

또 다른 일 양태에서, 본 발명은, 제어 장치상에서 실행 가능한 컴퓨터 프로그램, 특히 컴파일링 명령 및/또는 링크 명령을 포함하는 소스 코드를 생성하기 위한 처리 명령들이 통합된 새로운 프로그램 코드와도 관련되며, 이 경우 프로그램 코드는, 이 프로그램 코드가 처리 명령에 따라 실행 가능한 컴퓨터 프로그램으로 변환되는 경우에, 다시 말해 컴파일링 및/또는 링크되는 경우에, 기술된 방법들 중 하나의 방법의 모든 단계를 실행하기 위한 컴퓨터 프로그램을 생성한다. 상기 프로그램 코드는 특히, 예를 들어 인터넷 서버로부터 다운로드 가능한 소스 코드를 통해 제공될 수 있다.In another aspect, the present invention also relates to new program code incorporating processing instructions for generating source code comprising computer instructions executable on a control device, in particular compilation instructions and/or link instructions, which The case program code is for executing all steps of one of the methods described in the case where the program code is converted into an executable computer program according to processing instructions, that is, compiled and/or linked. Create a computer program. The program code can be provided, for example, through source code downloadable from an Internet server, for example.

도 1은 SCR 촉매 컨버터 시스템을 위한 계량공급 장치의 개략도이다.
도 2는 시간에 걸쳐 기입된 상이한 신호들을 도시한 그래프이다.
도 3은 본 발명에 따른 접근 방식을 명료화하기 위한 흐름도이다.1 is a schematic diagram of a metering supply device for an SCR catalytic converter system.
2 is a graph showing different signals written over time.
3 is a flowchart for clarifying an approach according to the present invention.

도 1에는, 요소 수용액을 계량 주입하기 위한 SCR 촉매 컨버터 시스템의 필수 요소들이 도시되어 있다. 요소 수용액은 저장 용기(100) 내에 존재하고, 그곳으로부터 계량공급 장치(110)를 거쳐 내연기관의 배기 매니폴드(120) 내에 도달한다. 배기 매니폴드 내에서 요소 수용액은 바람직하게 곧바로 SCR 촉매 컨버터 내에 도달하거나, SCR 촉매 컨버터 내로 가이드하는 배기가스 라인 내에 도달한다. SCR 촉매 컨버터 시스템은 선택적 촉매 환원(SCR)에 의해서 내연기관의 배기가스 내 질소 산화물을 환원하는 데 이용된다. 환원을 위해, 계량공급 장치(110)용 환원제가 SCR 촉매 컨버터 상류에서 배기가스 매니폴드(120) 내로 분사된다.In Fig. 1, essential elements of an SCR catalytic converter system for metered injection of urea aqueous solution are shown. The urea aqueous solution is present in the storage container 100, from which it reaches the exhaust manifold 120 of the internal combustion engine via the metering device 110. The aqueous urea solution in the exhaust manifold preferably reaches directly into the SCR catalytic converter, or into the exhaust gas line leading into the SCR catalytic converter. The SCR catalytic converter system is used to reduce nitrogen oxides in the exhaust gas of an internal combustion engine by selective catalytic reduction (SCR). For reduction, the reducing agent for the metering supply device 110 is injected into the exhaust gas manifold 120 upstream of the SCR catalytic converter.

요소 수용액은 저장 용기(100) 내에 저장된다. 저장 용기 내에는 초음파 센서(130)가 배치되어 있다. 상기 초음파 센서(130)에 의해서 요소 수용액의 음속이 측정될 수 있다. 초음파 센서(130)의 출력 신호는 제어 장치(140)에 도달한다. 상기 제어 장치는 특히 계량공급 장치(110)를 제어한다. 그 밖에도, 제어 장치는 배기 매니폴드 및 내연기관의 또 다른 요소들도 제어할 수 있다. 또한, 제어 신호의 생성을 위해 사용되는 또 다른 센서들이 평가될 수 있다.The aqueous urea solution is stored in the storage container 100. The ultrasonic sensor 130 is disposed in the storage container. The sound velocity of the aqueous urea solution may be measured by the ultrasonic sensor 130. The output signal of the ultrasonic sensor 130 reaches the control device 140. The control device in particular controls the metering supply device 110. In addition, the control device can also control the exhaust manifold and other elements of the internal combustion engine. In addition, other sensors used for the generation of control signals can be evaluated.

특히, 온도 값을 검출하는 온도 센서가 제공된다. 이 경우, 바람직하게 배기 매니폴드 내의 온도가 이용된다. 이를 위해, 특히 센서(150)가 제공된다. 이 센서도 마찬가지로 제어 장치(140)로 신호를 전달한다.In particular, a temperature sensor for detecting a temperature value is provided. In this case, the temperature in the exhaust manifold is preferably used. To this end, in particular, a sensor 150 is provided. This sensor likewise transmits a signal to the control device 140.

또한, 요소 수용액의 온도에 상응하는 온도 값(T)이 검출되는 방법이 제안된다.In addition, a method is proposed in which a temperature value T corresponding to the temperature of the aqueous urea solution is detected.

도 2에는, 상기 액체의 온도(T)에 대한 상이한 액체들의 음속(SG)의 의존성이 도시되어 있다. 요소 수용액에 대한 값은 점선으로 표시되어 있고, 거의 순수한 물에 대한 값은 파선으로 표시되어 있으며, 디젤 연료에 대한 값은 실선으로 표시되어 있다. 요소 수용액이 가장 높은 음속을 갖는다. 요소 수용액의 음속은 온도(T)가 상승함에 따라 증가한다. 물의 음속은 훨씬 더 낮지만, 마찬가지로 온도가 상승함에 따라 증가한다. 그와 달리, 디젤 연료는 뚜렷하게 더 낮은 음속을 갖는다. 디젤 연료의 음속은 온도가 상승함에 따라 감소한다. 매우 낮은 온도 값에서는 디젤 연료의 음속이 순수한 물의 음속과 같거나 심지어 더 높다. 온도(TS)부터는, 디젤 연료의 음속이 물의 음속보다 낮아진다.2, the dependence of the sound velocity SG of different liquids on the temperature T of the liquid is shown. Values for aqueous urea solutions are indicated by dotted lines, values for nearly pure water are indicated by broken lines, and values for diesel fuel are indicated by solid lines. Urea aqueous solution has the highest sound velocity. The sound velocity of the aqueous solution of urea increases with increasing temperature (T). The sound velocity of water is much lower, but likewise increases with increasing temperature. In contrast, diesel fuel has a significantly lower sound velocity. The speed of sound in diesel fuel decreases as the temperature rises. At very low temperature values, the speed of sound of diesel fuel is equal to or even higher than that of pure water. From the temperature TS, the sound velocity of diesel fuel becomes lower than that of water.

원치 않았거나 실수로 발생한 잘못된 보충에 의해, 한 편으로는 더 낮은 농도의 요소 수용액 또는 심지어 순수 물이나 디젤 연료가 재보충될 수 있다. 이와 같은 상황은 이하에 기술된 방법에 의해 확실하게 검출된다. 본 발명에 따르면, 이를 위해 음속(SG)이 측정된다.On the one hand, lower concentrations of urea aqueous solutions or even pure water or diesel fuel can be replenished, either by unwanted or accidental wrong replenishment. Such a situation is reliably detected by the method described below. According to the invention, the sound velocity SG is measured for this.

음속이 점선과 파선 사이의 범위 내에 있는 경우, 불충분한 농도의 요소 수용액이 재보충되었다는 에러가 검출된다. 이 경우, 바람직하게 계량공급 시스템이 계속 작동되는데, 그 이유는 더 적게 계량공급된 요소 수용액으로도 질소 산화물의 소정의 환원이 이루어지기 때문이다.When the speed of sound is within the range between the dotted line and the broken line, an error that an aqueous solution of urea with insufficient concentration is refilled is detected. In this case, the metering system is preferably operated continuously, since a predetermined reduction of nitrogen oxide is achieved even with a less metered urea aqueous solution.

그와 달리, 물의 음속보다 명백히 더 낮은 음속이 측정되면, 구성요소 보호의 이유에서 시스템의 스위치 오프를 유도하는 에러 비트가 세팅된다. 따라서, 배기 매니폴드 내로 디젤 연료가 계량공급됨으로 인해 다른 부품들이 손상되는 상황이 방지될 수 있다.Alternatively, if a sound velocity that is clearly lower than the sound velocity of water is measured, an error bit is set that causes the system to switch off for reasons of component protection. Accordingly, a situation in which other parts are damaged due to metering of diesel fuel into the exhaust manifold can be prevented.

그럼으로써, 예를 들어 연료의 재보충이 검출될 수 있고, 시스템이 안전한 상태에 놓일 수 있다. 추가 질의에 의해 기능을 확장함으로써, 요소 수용액보다 더 높은 음속을 갖는 다른 액체들도 검출될 수 있다.Thereby, for example, refueling of fuel can be detected and the system can be placed in a safe state. By extending the function by further query, other liquids with a higher sound velocity than the aqueous urea solution can also be detected.

본 발명에 따른 접근 방식의 일 실시예가 도 3에 흐름도에 기반하여 예시적으로 도시되어 있다. 제1 단계(300)에서는, 저장 용기(100) 내 액체의 음속(SG) 및 온도(T)가 측정된다. 후속 질의(310)는, 온도(T)가 설정값(TS)보다 큰지의 여부를 체크한다. 상기 질의(310)로써, 디젤 연료의 음속이 물의 음속보다 더 낮은, 상기 설정값(TS)보다 큰 온도 범위 내에서만 측정이 수행되는 점이 보장된다.One embodiment of the approach according to the invention is illustrated illustratively based on the flow chart in FIG. 3. In the first step 300, the sound velocity (SG) and temperature (T) of the liquid in the storage container 100 are measured. Subsequent query 310 checks whether the temperature T is greater than the set value TS. As the query 310, it is ensured that the measurement is performed only within a temperature range greater than the set value TS, where the speed of sound of diesel fuel is lower than that of water.

질의(310)에서 온도(T)가 설정값(TS) 이하인 것으로 검출되면, 단계(315)에서 프로그램이 종료된다. 질의(310)에서 온도(T)가 설정값(TS)보다 높은 것으로 검출되면, 질의(320)에서는 음속(SG)이 제1 임계값(S1)보다 낮은지가 체크된다. 낮지 않다면, 마찬가지로 단계(315)에서 프로그램이 종료된다. 음속이 제1 임계값(S1)보다 낮다면, 질의(330)에서 음속(SG)이 임계값(S2)보다 작은지의 여부도 체크된다. 이때, 제2 임계값(S2)은 제1 임계값(S1)보다 훨씬 더 작다. 임계값(S1 및 S2)에 의해, 허용되지 않는 요소 농도를 갖는 요소 수용액이 검출되는 범위가 규정된다. 허용되지 않는 요소 농도를 갖는 요소 수용액은, 질의(320)에서 음속이 제1 임계값(S1)보다 낮은 것으로 검출되고, 제2 질의(330)에서 음속이 임계값(S2)보다 높은 것으로 검출되는 경우에 검출된다. 그와 같은 경우에는, 단계(340)에서 불충분한 특성을 갖는 요소 수용액이 검출된다. 이 경우, 이러한 상황이 운전자에게 표시되고, 에러 메모리 내 상응하는 엔트리가 수행되며, 필요 시 비상 주행 모드가 개시된다.If it is detected in the query 310 that the temperature T is equal to or less than the set value TS, the program ends in step 315. If it is detected in the query 310 that the temperature T is higher than the set value TS, it is checked in the query 320 whether the sound velocity SG is lower than the first threshold value S1. If not, the program ends in step 315 as well. If the sound velocity is lower than the first threshold value S1, it is also checked in the query 330 whether the sound velocity SG is smaller than the threshold value S2. At this time, the second threshold value S2 is much smaller than the first threshold value S1. By the threshold values S1 and S2, a range in which an aqueous solution of urea having an unacceptable concentration of urea is detected is defined. The aqueous solution of urea having an unacceptable urea concentration is detected in the query 320 as having a sound velocity lower than the first threshold value S1, and in the second query 330 as detecting that the sound velocity is higher than the threshold value S2. In case it is detected. In such a case, in step 340, an aqueous solution of urea having insufficient properties is detected. In this case, this situation is displayed to the driver, the corresponding entry in the error memory is performed, and an emergency driving mode is initiated if necessary.

질의(330)에서 음속이 제2 임계값(S2)보다도 낮은 것으로 검출되면, 단계(350)에서 디젤 연료의 보충이 검출된다. 이 경우, 배기가스 후처리 시스템의 즉각적인 스위치 오프가 수행된다. 필요한 경우, 이러한 상황도 마찬가지로 운전자에게 표시될 수 있고, 에러 메모리 내 상응하는 엔트리가 수행될 수 있다.If it is detected in the query 330 that the sound velocity is lower than the second threshold value S2, in step 350, replenishment of diesel fuel is detected. In this case, an immediate switch-off of the exhaust aftertreatment system is performed. If necessary, this situation can likewise be indicated to the driver, and the corresponding entry in the error memory can be performed.

이는, 음속의 값 범위가 제1 임계값(S1)과 제2 임계값(S2) 사이에 놓일 경우, 불충분한 농도의 요소 수용액이 검출됨을 의미한다. 임계값(S2) 미만의 값 범위에서는 연료의 보충이 검출된다.This means that when the value range of the sound velocity lies between the first threshold value S1 and the second threshold value S2, an aqueous solution of urea of insufficient concentration is detected. In the value range below the threshold value S2, replenishment of fuel is detected.

바람직한 일 실시예에서는, 요소 수용액의 빙점 미만의 온도에서 측정이 실시된다. 이 경우에는 초음파 센서가 신호를 전달해서는 안 되는데, 그 이유는 상기 초음파 센서가 제 기능을 할 수 없기 때문이다. 그럼에도 초음파 센서가 신호를 제공한다면, 잘못된 보충이 추정된다.In one preferred embodiment, the measurement is carried out at a temperature below the freezing point of the aqueous urea solution. In this case, the ultrasonic sensor should not transmit the signal, because the ultrasonic sensor cannot function properly. Nevertheless, if the ultrasonic sensor provides a signal, a false replenishment is assumed.

Claims (8)

자동차 내에서 액체용의, 특히 요소 수용액용의 저장 용기의 잘못된 보충을 검출하기 위한 방법으로서,
액체 내의 음속이 결정되고, 상기 음속이 예상된 값으로부터 벗어날 때 잘못된 보충이 검출되는, 자동차 내 저장 용기의 잘못된 보충의 검출 방법.A method for detecting false replenishment of a storage container for liquids, especially for aqueous urea solution, in a vehicle,
A method for detecting a false replenishment of a storage container in a vehicle, wherein a sound velocity in the liquid is determined, and an incorrect replenishment is detected when the sound velocity deviates from the expected value. 제1항에 있어서, 상기 음속이 제1 임계값과 제2 임계값 사이에 놓이는 경우, 저품질의 요소 수용액의 보충이 검출되는 것을 특징으로 하는, 자동차 내 저장 용기의 잘못된 보충의 검출 방법.The method of claim 1, wherein when the sound velocity lies between the first threshold and the second threshold, replenishment of a low-quality urea aqueous solution is detected. 제1항 또는 제2항에 있어서, 상기 음속이 제2 임계값 미만인 경우, 디젤 연료의 보충이 검출되는 것을 특징으로 하는, 자동차 내 저장 용기의 잘못된 보충의 검출 방법.The method of claim 1 or 2, wherein when the sound velocity is less than a second threshold, replenishment of diesel fuel is detected. 제1항 내지 제3항 중 어느 한 항에 있어서, 온도가 임계값보다 높은 경우, 잘못된 보충의 존재 여부에 대한 체크가 수행되는 것을 특징으로 하는, 자동차 내 저장 용기의 잘못된 보충의 검출 방법.The method according to any one of claims 1 to 3, wherein when the temperature is higher than a threshold value, a check is made for the presence or absence of an incorrect replenishment. 제1항 내지 제4항 중 어느 한 항에 따른 방법들 중 하나의 방법의 모든 단계를 실행하도록 설계된 컴퓨터 프로그램.A computer program designed to carry out all the steps of one of the methods according to claim 1. 제5항에 따른 컴퓨터 프로그램이 저장되어 있는 기계 판독 가능 저장 매체.A machine-readable storage medium storing the computer program according to claim 5. 제1항 내지 제4항 중 어느 한 항에 따른 방법들 중 하나의 방법의 모든 단계를 실행하도록 설계된 제어 장치.A control device designed to carry out all the steps of one of the methods according to claim 1. 제어 장치상에서 실행 가능한 컴퓨터 프로그램을 생성하기 위한 처리 명령들이 통합된 프로그램 코드로서,
상기 프로그램 코드가 처리 명령들에 따라 실행 가능한 컴퓨터 프로그램으로 변환되면, 제5항에 따른 컴퓨터 프로그램을 생성하는 프로그램 코드.A program code in which processing instructions for generating a computer program executable on a control device are integrated,
A program code for generating a computer program according to claim 5 when the program code is converted into an executable computer program according to processing instructions.
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