SE1351238A1 - Arrangement and procedure for diagnosing a cooling system in a vehicle - Google Patents
Arrangement and procedure for diagnosing a cooling system in a vehicle Download PDFInfo
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- SE1351238A1 SE1351238A1 SE1351238A SE1351238A SE1351238A1 SE 1351238 A1 SE1351238 A1 SE 1351238A1 SE 1351238 A SE1351238 A SE 1351238A SE 1351238 A SE1351238 A SE 1351238A SE 1351238 A1 SE1351238 A1 SE 1351238A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
- F01P11/16—Indicating devices; Other safety devices concerning coolant temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2025/00—Measuring
- F01P2025/08—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2025/00—Measuring
- F01P2025/60—Operating parameters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2031/00—Fail safe
- F01P2031/20—Warning devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2060/00—Cooling circuits using auxiliaries
- F01P2060/02—Intercooler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2060/00—Cooling circuits using auxiliaries
- F01P2060/04—Lubricant cooler
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Sarnmandrag Foreliggande uppfinning avser ett arrangemang och ett forfarande for att diagnosticera ett kylsystem i ett fordon. Arrangemanget innefattar en styrenhet (13) som innefattar eller bar tillgang till en modell (M) som sianderar drift av kylsystemet med hjalp av ett flertal ingaende parametrar (p, qn) riled vilken modell (M) det är mojligt att bestamma ett idealt varde (pi) av atminstone en forsta parameter (p) som är relaterad till kylsystemets prestanda. Styrenheten (13) hr anpassad att upps.katta ett idealt varde (pi) av den torsta parametem (p) med hjalp av modellen (M), att erhalla information avseende ett arvarde (par) av den fOrsta parametem (p) och att bestanlma en avvikelse (A) mellan det ideala vardet (pi) och arvardet (par) av den forsta parametern (p). Styrenheten (13) har tillgang till information avseende en maximalt acceptabel avvikelse (Amax) for den forsta parametem (p) vid vi.lken service av kylsystemet la& utforas. Anangernanget innefattar en indikeringsanordning (17) som ar anpassad att pavisa att service av kylsystemet bor utforas om avvikelsen (A) hr stone an den maxirnalt acceptabla avvikelsen (Amax). The present invention relates to an arrangement and a method for diagnosing a cooling system in a vehicle. The arrangement comprises a control unit (13) which comprises or had access to a model (M) which controls operation of the cooling system by means of a plurality of input parameters (p, qn) riled which model (M) it is possible to determine an ideal value ( pi) of at least one first parameter (p) related to the performance of the cooling system. The control unit (13) is adapted to estimate an ideal value (pi) of the thirst parameter (p) by means of the model (M), to obtain information regarding an inheritance value (pair) of the first parameter (p) and to determine a deviation (A) between the ideal value (pi) and the inheritance value (pair) of the first parameter (p). The control unit (13) has access to information regarding a maximum acceptable deviation (Amax) for the first parameter (p) at which service of the cooling system is performed. The attachment comprises an indicating device (17) which is adapted to demonstrate that service of the cooling system should be performed if the deviation (A) is higher than the maximally acceptable deviation (Amax).
Description
58750SE kg/ Sokandc: Scania CV AB Arrangemang och forfarande for att diagnosticera ett kylsystem I ett fordon 10 UPPF1NNINGENS BAKGRUND OCH KANT) TEKNIK Foreliggande uppfinning avser ett anangernang och ett ftirfarande for att diagnosticera ett kylsystem i ett fordon enligt patentkravens loch 11 ingresser. BACKGROUND OF THE INVENTION AND EDGE) TECHNOLOGY The present invention relates to an annealing and a method for diagnosing a cooling system in a vehicle according to the preamble of claim 11.
Kylsystem i fordon erhaller med tiden en reducerad prestanda pga. nedsmutsning, slitage, korrosion etc. Om, exempelvis, den varmeOverfOrande ytan i en kylare eller dess varmeoverfOrande fOrmaga reduceras pa grund av, exempelvis, nedsmutsning maste kylvatskepumpen tillhandahalla ett okat kylvatskeflode genom kylaren och kylflakten ett iikat luftflode genom kylaren far att kompensera for bortfallet av den varmeoverforande ytan. Kylflakten och kylvatskepumpen drivs direkt eller indirekt av forbranningsmotom vilket resulterar i att forbranningsmotoms bransleforbrukning Okar takt med att kylsystemets prestanda reduceras. En forsamrad prestanda has kylsystemet medfor aven att det har en otillracklig fOttuaga att kyla forbranningsmotorn da den är hart belastad. Kylsystemet kan aven ha till uppgift att kyla andra kornponenter och medier sasom laddluft, atercirkulerande avgaser och olja hos en hydrodynamisk retarder. En otillracklig kylning i dessa fall kan resultera I att forbranningsmotorn erhaller en reducerad effekt, okade utslapp av kvaveoxider avgasema och en reducerad bromskapacitet has retardem. Cooling systems in vehicles receive a reduced performance over time due to. fouling, wear, corrosion, etc. If, for example, the heat transfer surface of a radiator or its heat transfer capacity is reduced due to, for example, fouling, the coolant pump must provide an increased coolant flow through the radiator and the cooling surface a compensated air flow through the radiator to compensate the heat transfer surface. The cooling fluid and the coolant pump are driven directly or indirectly by the combustion engine, which results in the combustion engine's fuel consumption increasing as the performance of the cooling system is reduced. The pre-assembled performance of the cooling system also means that it has an insufficient fuel to cool the internal combustion engine as it is heavily loaded. The cooling system can also have the task of cooling other grain components and media such as charge air, recirculating exhaust gases and oil in a hydrodynamic retarder. Insufficient cooling in these cases can result in the internal combustion engine receiving a reduced power, increased emissions of nitrogen oxides, exhaust gases and a reduced braking capacity.
Ett kylsysterns prestanda reduceras snabbt om fordonet anvands i smutsiga miljoer. I sadana fall kan kylaren som i regel sitter vid fordonets frontyta mer eller mindre tappas igen av fOroreningar som fors mcd av den kylande luftstrommen som sugs genom kylaren. Has vissa typer av fordon som frekvent frainfors i mer eller mindre starkt fororenade miljoer rengOrs kylarna med tata mellanrum. Den takt i vilken en kylare smutsas ned kan skilja sig markant mellan olika fordon. Det kan konstateras att kylare has vissa fordon rengors alltfor sallan medan andra kylare rengiirs i onOdan. 2 SAMMANFATTNING AV UPPFINNINGEN Syftet med fOreliggande uppfinning at att tillhandahalla ett arrangemang som mojliggor service av ett kylsystem i ett fordon lunar( det erhallit en alltfor reducerad prestanda samtidigt som onodig service av kylsystemet kan undvikas. The cooling sister's performance is quickly reduced if the vehicle is used in dirty environments. In such cases, the radiator, which is usually located at the front surface of the vehicle, can more or less be drained again by contaminants that are driven by the cooling air stream that is sucked through the radiator. Have certain types of vehicles frequently frequented in more or less heavily polluted environments clean the coolers at regular intervals. The rate at which a radiator is soiled can differ markedly between different vehicles. It can be stated that radiators have some vehicles cleaned too much while other radiators are cleaned in onOdan. SUMMARY OF THE INVENTION The object of the present invention is to provide an arrangement which enables service of a cooling system in a vehicle lunar (it has obtained an excessively reduced performance while unnecessary service of the cooling system can be avoided.
Arrangemanget innefattar saledes en styrenhet som hat- tillgang till en model' som innefattar en forsta parameter och atminstone en driftsparameter. Den forsta parametern har ett varde som är relaterat till kylsystemets prestanda. En eller flora dnftsparametrar definierar det drifttillstand vid vilket de( farsta parametervardet bestams i modellen. Modellen kan aven innefatta parametrar som är relaterade till det specifika fordonet och dess komponenter. Enligt uppfinningen uppskattar styrenheten ett idealt varde av den forsta parametern med hj alp av modellen. Det ideala vardet avser parametems varde da kylsystemet är i nyskick och da det bar en optimal prestanda. Styrenheten erhaller under drift av kylsystemet information orn verkliga arvarden av naranda forsta parameter. Styrenheten bestammer den avvikelse som fOrekornrner mellan det ideala vardet och det verkliga vardet av den forsta parametem. Avvikelsen kan vara skillnaden, kvoten eller nagot annat samband mellan dessa varden vilket kan definieras som en avviketse. Avvikelsens storlek är relaterad till hut mycket kylsystemets prestanda reducerats i forhallande till da dot var nytt. Styrenheten har tillgang till information avseende en maximalt acceptabel avvikelse for den forsta parametern vid vilken service av kylsystemet bor utferas. An-angemanget innefattar en indikeringsanordning som dr anpassad att pavisa dã service av kylsystemet bOr utforas. The arrangement thus comprises a control unit which has access to a model which comprises a first parameter and at least one operating parameter. The first parameter has a value that is related to the performance of the cooling system. One or more operating parameters define the operating state at which they (first parameter value is determined in the model. The model may also include parameters related to the specific vehicle and its components. According to the invention, the control unit estimates an ideal value of the first parameter using the model. The ideal value refers to the value of the parameter when the cooling system is in new condition and when it had an optimal performance.During the operation of the cooling system, the control unit obtains information about the actual values of the first parameter.The control unit determines the deviation between the ideal value and the actual value of it. The deviation can be the difference, the ratio or some other connection between these values which can be defined as a deviation. The size of the deviation is related to how much the cooling system's performance is reduced in relation to when it was new. The control unit has access to information regarding a maximum acceptable avv for the first parameter at which service of the cooling system should be performed. The arrangement comprises an indicating device which is adapted to indicate when service of the cooling system should be performed.
Styrenheten aktiverar indikeringsanordningen sa att den pavisar att service bor utforas vid tillfallen som ovan namnda avvikelse ir storre an den maximalt acceptabla avvikelsen. I detta fall erhalls alltid en indikation pa da det är dags att utfora service av kylsystemet. Dot är darmed mojligt att utfora service av kylsystemet innan dess prestanda reducerats till en alltfor lag niva. SA lange son( indikeringsanordningen jute pavisar att service bor utforas kan man forutsatta att det har en god prestanda. Darmed kan onodig service av kylsystem undvikas. The control unit activates the indicating device so that it indicates that service should be performed in the event that the above-mentioned deviation is greater than the maximum acceptable deviation. In this case, an indication is always obtained when it is time to service the cooling system. Dot is thus possible to service the cooling system before its performance has been reduced to an excessively low level. SA lange son (the jute indicator device indicates that service should be performed, it can be assumed that it has a good performance. Thus, unnecessary service of cooling systems can be avoided.
Enligt en utfOringsform av fOreliggande uppfinning är styrenheten anpassad att berakna dot ideala vardet av den fOrsta parametern med hjalp av namnda model Modellen är i detta fall en berakningsmodell. Modellen innefattar atminstone ett matematiska samband mellan de ingdende parametrarna. Dot matematiska sambandet 3 är utformat sa att det är mOjligt berakning av ett idealt varde av namnda forsta parameter med hjalp av information avseende varden pa &riga parametrar som kan vara driftsparametrar som definierar det drifttillstand vid vilken den ideala parametem beraknas och fordonsspecifika parametrar som är individuella fir fordonet. According to an embodiment of the present invention, the control unit is adapted to calculate the ideal value of the first parameter with the aid of said model. The model is in this case a calculation model. The model includes at least one mathematical relationship between the input parameters. The mathematical relationship 3 is designed so that it is possible to calculate an ideal value of said first parameter with the aid of information regarding the value of other parameters which may be operating parameters which define the operating state at which the ideal parameter is calculated and vehicle specific parameters which are individual the vehicle.
Enligt en utforingsform av foreliggande uppfinning är styrenheten anpassad att berakna det ideala vardet av den forsta parametem med hjalp av en modell som simulerar drift av kylsystemet da det är i ett statiskt driftstillstand. Under drift av ett fordon uppkommer ternporart mer eller mindre statiska drifttillstand. Med ett statiskt drifttillstand avses att en eller flera driftpararnetrar som ingar i modellen bar vasentligen konstanta varden. Styrenheten kan berakna de aktuella driftspararnetrarnas derivata fOr att uppskatta om ett statiskt drifttillstand uppkommit. Da de aktuella driftparametrarnas derivata understiger ett bestamt varde gar styrenheten bedomning att ett statiskt drifttillstand uppkommit och det beraknar darmed ett idealt varde av den forsta parametem for detta drifttillstand. Styrenheten mottar samtidigt information avseende det verkliga vardet av namnda forsta parameter vid detta drifttillstand vaiTa styrenheten faststaller en eventuell avvikelse mellan namnda varden. According to an embodiment of the present invention, the control unit is adapted to calculate the ideal value of the first parameter with the aid of a model which simulates operation of the cooling system when it is in a static operating state. During operation of a vehicle, ternporart more or less static operating state arises. By a static operating state is meant that one or more operating parameters that form part of the model had essentially constant values. The control unit can calculate the derivatives of the current operating parameters in order to estimate whether a static operating condition has arisen. Since the derivatives of the current operating parameters are less than a certain value, the control unit assesses that a static operating state has arisen and thus calculates an ideal value of the first parameter for this operating state. At the same time, the control unit receives information regarding the actual value of said first parameter at this operating state while the control unit determines a possible deviation between said value.
Enligt en annan utforingsform av foreliggande uppfinning är styrenheten anpassad att berakna det ideala vardet av den forsta parametern med hjalp av en model! som simulerar drift av kylsystemet i realtid. Derma modell kan forutom en forsta parameter, driftsparametrar och fordonsspecifika parametrar aven innehalla simulering av terrnostatens funktion, I data fall kan den forsta parametem beraknas under pa forhand bestamda dynamiska tillstand. I detta fall kan den firsta parametem utgoras av derivatan av, exempelvis, en temperatur eller annan storliet som andras under det dynamiska tillstandet. Altemativt kan den fOrsta parametem vara ett maximalt varde eller ett minirnalt varde av exempelvis en temperatur eller annan storhet som andras under det dynamiska tillstandet. According to another embodiment of the present invention, the control unit is adapted to calculate the ideal value of the first parameter with the aid of a model! which simulates operation of the cooling system in real time. This model can, in addition to a first parameter, operating parameters and vehicle-specific parameters, also contain simulation of the function of the thermostat. In data cases, the first parameter can be calculated under predetermined dynamic conditions. In this case, the first parameter may be the derivative of, for example, a temperature or other magnitude different from the dynamic state. Alternatively, the first parameter may be a maximum value or a minimum value of, for example, a temperature or other quantity other than during the dynamic state.
Enligt en ytterligare utforingsform av foreliggande uppfinning är styrenheten anpassad att berakna det ideala vardet av den forsta parametem med hjalp av namnda modell vasentligen kontinuerligt under drift av kylsystemet. I detta fall beraknas den forsta parametem vasentligen kontinuerligt fran det att cirkulationen av kylvatskan startar kylsystemet till den upphor. Derma modell innefattar fOrutorn en farsta parameter, driftparametrar och fordonsspecifika parametrar aven logik for styrning av kylflakt, kylvatskepump och termostat i fall derma är aktivt styrd. Det beraknade ideala vardet 4 av det forsta parametervardet jamfors kontinuerligt med mottagna verkliga arvarden av den fOrsta parametem. According to a further embodiment of the present invention, the control unit is adapted to calculate the ideal value of the first parameter with the aid of said model substantially continuously during operation of the cooling system. In this case, the first parameter is calculated substantially continuously from the time the circulation of the cooling liquid starts the cooling system until it ceases. This model includes a first parameter, operating parameters and vehicle-specific parameters as well as logic for controlling the cooling surface, cooling water pump and thermostat in case it is actively controlled. The calculated ideal value 4 of the first parameter value is continuously compared with the received real values of the first parameter.
Enligt en annan utforingsfatm av foreliggande uppfinning innefattar narnnda modell en databas med lagrad information avseende atminstone ett idealt varde av den fOrsta parametem och atminstone en driftsparameter vilka definierats dã kylsystemet var nyskick. I detta fall dr modellen statistisk. Den inhArntar under en period da fordonet Ar nyskick ett varde av namnda fOrsta parameter. Eftersom fordonet Ar i nyskick forutsatts att kylsystemet har en optimal prestanda och att det inhamtade vardet dart& kan betraktas som ett idealt varde. Vardet p det ideala forsta parametervardet och namnda driftsparameter kan lagras i en forsta databas i modellen. I data fall erfordras inte att modellen innefattar nhgra fordonsspecifika parametrar. Derma modell kan darfor utan anpassning inforas ph alla typer av fordon. Styrenheten kan i detta fall vara anpassad att mottaga information avseende arvarden av den fOrsta pararnetem och namnda driftparameter, och att uppskatta en avvikelse mellan arvardet och det lagrade ideala vardet av namnda fOrsta parameter da styrenheten mottar ett varde av namnda driftsparameter som motsvarar det lagrade vardet av driftsparametern. I regel erfordras tier an en driftpararneter Ma- att definiera ett drifitillstand. According to another embodiment of the present invention, said model comprises a database with stored information regarding at least an ideal value of the first parameter and at least one operating parameter which were defined when the cooling system was in new condition. In this case, the model is statistical. It inherits during a period when the vehicle is in new condition a value of the said first parameter. Since the vehicle is in new condition, it is assumed that the cooling system has an optimal performance and that the acquired value dart & can be considered an ideal value. The value of the ideal first parameter value and said operating parameters can be stored in a first database in the model. In data cases, the model is not required to include any vehicle-specific parameters. This model can therefore be introduced without adaptation to all types of vehicles. The control unit may in this case be adapted to receive information regarding the value of the first pair parameter and said operating parameter, and to estimate a deviation between the inheritance and the stored ideal value of said first parameter when the control unit receives a value of said operating parameter corresponding to the stored value of the operating parameter. As a rule, it is required to define an operating state.
Enligt en annan utforingsform av fdreliggande uppfinning utgiirs den fOrsta parametem av temperaturen eller derivatan av temperaturen hos en kylvatska som cirkulerar kylsystemet. Kylvatskan som cirkulerar i kylsystemet upp tar vanneenergi dh den kyler forbranningsmotorn och eventuella andra komponenter eller medier i kylsystemet. Kylvatskan avger den upptagna varmeenergin i en kylare som kan vara kyld av luft vid ett frontparti hos fordonet. Urn ett kylsystems forrnaga att avge varmeenergi respektive uppta vane energi sjunker erhhller det en reducerad prestanda. Kylvatskans temperatur i en lamplig position i kylsystemet kan utgora en fOrsta parameter som indikerar om kylsystemets varmebverfOrande Mt-maga sjunkit i nhgon del av kylsystemet. Kylvatskans temperaturderivata definierar den hastighet med vilken kylvatskans temperatur Andras vilket ocksh kan vara en lamplig fOrsta parameter. According to another embodiment of the present invention, the first parameter of the temperature or derivative of the temperature of a coolant circulating the cooling system is issued. The coolant circulating in the cooling system absorbs hydropower energy, ie it cools the internal combustion engine and any other components or media in the cooling system. The coolant emits the absorbed heat energy in a radiator that may be cooled by air at a front of the vehicle. As a cooling system's ability to emit heat energy or absorb habitual energy decreases, it receives a reduced performance. The temperature of the cooling vessel in a suitable position in the cooling system can constitute a first parameter which indicates whether the heat transfer of the cooling system of the cooling system has decreased in any part of the cooling system. The coolant temperature derivative defines the rate at which the coolant temperature of the other can also be an appropriate first parameter.
Kylvatskans rnaximala temperatur eller minimala temperatur kan aven utgora lampliga fOrsta parametrar for att under vissa drifttillstand utrona orn kylsystemets prestanda har reducerats. Andra altemativa fOrsta parametrar kan vara temperatur och temperaturderivata hos komponenter och medier som kyls av kylvhtskan. Om, exernpelvis, kylsystemet kyler laddluft i en laddluftkylare sA kan laddluftens ternperatur eller temperaturderivata utgora en forsta parameter som kan anvandas for att utrana om kylsysternets prestanda. The maximum temperature or minimum temperature of the cooling water can also constitute suitable initial parameters to determine during certain operating conditions whether the performance of the cooling system has been reduced. Other alternative first parameters may be temperature and temperature derivatives of components and media cooled by the cooling heat. If, for example, the cooling system cools charge air in a charge air cooler sA, the charge air temperature or temperature derivatives can be a first parameter that can be used to ascertain the performance of the cooling system.
Enligt en utforingsform av fOreliggande uppfinning är styrenheten anpassad att inhamta information fran en sensor som avkanner ett varde som aT relaterat till namnda forsta parameter. En sadan sensor är med fOrdel en temperatursensor som avkanner kylvdtskans temperatur i Idmpliga position i kylsystemet. Altemativt kan en temperatursensor avkanna temperaturen hos en komponent eller ett medium som kyls av kylsystemet. En styrenhet som vdsentligen kontinuerligt mottar information fran en temperatursensor kart med Wall) av denna infomiati on uppskatta temperaturderivatan och en maximal eller minimal temperatur under ett visst drifttillstand. According to an embodiment of the present invention, the control unit is adapted to obtain information from a sensor which senses a value as aT related to said first parameter. Such a sensor is advantageously a temperature sensor which senses the temperature of the cooling vessel in the normal position in the cooling system. Alternatively, a temperature sensor may sense the temperature of a component or medium cooled by the cooling system. A control unit that essentially continuously receives information from a temperature sensor map with Wall) of this information can estimate the temperature derivative and a maximum or minimum temperature during a certain operating condition.
Enligt en utforingsform av foreliggande uppfinning ãr ndrrinda indikeringsanordning anpassad att indikera att kylsystemet behover genomga service genom att visa derma information pa en display i ett forarutrymme i fordonet, skicka inform ationen till en verkstad eller lagra informationen i fordonet. Det firms saledes flera sat att indikera att ett kylsystem behover genornga service. According to an embodiment of the present invention, a changing indicator device is adapted to indicate that the cooling system needs to be serviced by displaying this information on a display in a driver's compartment of the vehicle, sending the information to a workshop or storing the information in the vehicle. There are thus several ways to indicate that a cooling system needs regular service.
KORT BESKRIVNING AV RITNINGARNA I det foljande beskrivs, sasom exempel, foredragna utforingsformer av uppfinningen med hanvisning till bifogade ritningar, pa vilka: Fig. Ivisar ett kylsystem med ett arrangemang enligt fOreliggande uppfinningen oeh Fig. 2visar ett flodesschema som beskriver ett forfarande enligt fOreliggande uppfinning. BRIEF DESCRIPTION OF THE DRAWINGS In the following, by way of example, preferred embodiments of the invention are described with reference to the accompanying drawings, in which: Fig. Shows a cooling system with an arrangement according to the present invention and Fig. 2 shows a flow chart describing a method according to the present invention.
DETALJERAD BESKRIVNING AV FOREDRAGNA UTFORINGSFORMER AV 30 UPPFINNINGEN Fig. I visar ett kylsystem for att kyla en forbranningsmotor I i ett schematiskt visat fordon 2. Kylvatskan cirkuleras i kylsystemet med hjdlp av en kylvatskepump 3 som är anordnad i en inloppsledning 4 till forbranningsmotorn 1. Efter att kylvdtskan passerat genom forbranningsmotorn 1 leds den till en utloppsledning 5. Utloppsledningen innefattar i detta fall en oljekylare 6 for kylning av olja has en hydrodynamisk retarder 6 och en laddluftkylare 7 for kylning av laddluft. Kylsystemet kyler i detta fall saledes inte enbart forbranningsmotom 1. Kylsystemet kan utnyttjas fOr kylning av ytterligare komponenter och medier sasom, exempelvis, atereirkulerande avgaser i en EGRkylare. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION Fig. I shows a cooling system for cooling an internal combustion engine I in a schematically shown vehicle 2. The cooling liquid is circulated in the cooling system by means of a cooling water pump 3 which is arranged in an inlet motor. the cooling vessel passed through the internal combustion engine 1 is led to an outlet line 5. The outlet line in this case comprises an oil cooler 6 for cooling oil has a hydrodynamic retarder 6 and a charge air cooler 7 for cooling charge air. The cooling system in this case thus does not only cool the internal combustion engine 1. The cooling system can be used for cooling additional components and media such as, for example, recirculating exhaust gases in an EGR cooler.
Kylsystemet innefattar en termostat 8 som avkanner kylvdtskans temperatur utloppsledningen 5 i en position nedstroms oljekylaren 6 och laddluftkylaren 7. Vid driftstillfallen dA tennostaten 8 avkanner att kylvatskan har en lagre temperatur an en regleringsternperatur leder den kylvatskan till en bypassledning 9. Bypassledningen leder tillbaka kylvatskan till inloppsledningen 4 och kylvatskepumpen 3 for fornyad eirkulation i kylsystemet utan att kylas. Vid driftstillfallen dá termostaten 8 avkanner att kylvdtskan hat en hogre temperatur an regleringstemperaturen leder den kylvdtskan till en kylare 10 som är anordnad vid ett frontparti hos fordonet 2. Kylvatskan kyls kylaren 10 av tuft som strommar genorn kylaren 10 med hjalp av en kylflakt 12 och fordonets fartvind. Efter att kylvatskan kylts i kylaren 10 leds den, via en returledning 11, tillbaka till inloppsledningen 4 och kylvaskepumpen 3 for fornyad cirkulation kylsystemet. The cooling system comprises a thermostat 8 which senses the coolant temperature of the outlet line 5 in a position downstream of the oil cooler 6 and the charge air cooler 7. In operating cases dA the tin state 8 senses that the coolant has a lower temperature at a control temperature it leads the coolant to a bypass line. 4 and the cooling water pump 3 for renewed circulation in the cooling system without cooling. In the case of operation when the thermostat 8 detects that the coolant has a higher temperature than the control temperature, that coolant leads to a cooler 10 which is arranged at a front part of the vehicle 2. The coolant is cooled by the cooler 10 flowing through the radiator 10 by means of a cooling flap 12 and the vehicle speed wind. After the cooling liquid has been cooled in the cooler 10, it is led, via a return line 11, back to the inlet line 4 and the cooling wash pump 3 for renewed circulation of the cooling system.
Kylsystemet är utrustat med ett arrangernang som diagnosticerar kylsystemets prestanda. Arrangemanget innefattar en styrenhet 13 sorn kan vara en dator eller liknande komponent som är forsedd med en mjukvara for att styra diagnosticeringen av kylsystemet. Mjukvaran definierar en model' M som simulerar drift av kylsystemet med hjalp av ett flertal ingdende pararnetrar p, qn. Atminstone en av namnda parametrar tag& en forsta parameter p som är relaterad till kylsystemets prestanda. The cooling system is equipped with an arrangement that diagnoses the performance of the cooling system. The arrangement comprises a control unit 13 which may be a computer or similar component which is provided with a software for controlling the diagnosis of the cooling system. The software defines a model 'M that simulates operation of the cooling system using a plurality of input parameters p, qn. Take at least one of the mentioned parameters & a first parameter p which is related to the performance of the cooling system.
Ovriga parametrar (In utgOr driftspararnetrar som defmierar ett drifttillstAnd hos fordonet och fordonsspecifika parametrar. Styrenheten 13 mottar under drift information frail en sensor 14a som avkanner kylvdtskans temperatur efter att den kylt forbranningsmotom 1 och en sensor 141) som avkanner kylvdtskans temperatur efter att den passerat genom kylaren 10. Kylvatskans temperatur kan utgora en sadan forsta parameter p. I detta fall mottar styrenheten 13 aven information fran en sensor 15 som avkanner laddluftens temperatur i anslutning till laddluftkylaren 7. Derma parameter är aven relaterad till kylsystemets prestanda och kan alternativt eller i kombination utgOra en sadan forsta parameter p. ModeIlen M kan innefatta samband mellan parametrama p, qn som defmierar vauneutbytet i kylsystemet. 7 Kylvatskan i kylsystemet erhaller, i detta fall, tillfersel av varineenergi och uppvarmning da den le& genom forbranningsmotom 1 och laddluftkylaren 7. Den erhaller aven tillfdrsel av varmeenergi i retarderkylaren 6 vid tillfallen som retardem är aktiverad. Kylvdtskan kyls i kylaren 10 dar den avger varmeenergi till luften som strommar genom kylaren. Modeliens driftsrelaterade parametrar qn kan vara relaterade till varmeoverforingen som den cirkulerande kylvatskan i kylsystemet erhalter forbranningsmotom 1, oljekylaren 6, laddluftkylaren och kylaren 10. De driftsrelaterade parametrama qnkan awn vara relaterade till driften av forbranningsmotom 1, kylvatskepumpen 3 och kylarflakten 12. Other parameters (In constitute operating parameters that define an operating condition of the vehicle and vehicle-specific parameters. During operation, the control unit 13 receives information from a sensor 14a which senses the temperature of the coolant after it has cooled the internal combustion engine 1 and a sensor 141) which senses the temperature of the coolant after cooler 10. The coolant temperature can be such a first parameter p. In this case the control unit 13 also receives information from a sensor 15 which senses the charge air temperature in connection with the charge air cooler 7. This parameter is also related to the cooling system performance and can alternatively or in combination such a first parameter p. The model M may include relationships between the parameters p, qn which define the exchange rate in the cooling system. 7 The cooling liquid in the cooling system receives, in this case, a supply of varine energy and heating as it passes through the combustion engine 1 and the charge air cooler 7. It also receives a supply of heat energy in the retarder cooler 6 in the event that the retarder is activated. The coolant is cooled in the radiator 10 as it emits heat energy to the air flowing through the radiator. The operating parameters qn of the model may be related to the heat transfer that the circulating coolant in the cooling system receives the internal combustion engine 1, the oil cooler 6, the charge air cooler and the cooler 10. The operating related parameters may also be related to the operation of the internal combustion engine 1, the cooling water pump 3 and the cooling water pump 12.
Styrenheten 13 mottar under drift information avseende de driftsrelaterade parametrarna q fran en schematiskt visad enhet 16. Med hjalp av modellen M kan styrenheten 13 uppskatta ett varde pa den fOrsta parametem p och darmed avgora när kylsystemets prestanda sjunkit till en niva da. det är dags att tillhandahalla service av kylsystemet. Nar sa är fallet pavisas detta genom en indikeringsanordning l 7. During operation, the control unit 13 receives information regarding the operation-related parameters q from a schematically shown unit 16. Using the model M, the control unit 13 can estimate a value of the first parameter p and thus determine when the performance of the cooling system has dropped to a level da. it is time to provide service of the cooling system. When this is the case, this is indicated by an indicating device 17.
Indikeringsanordningen 17 kan indikera att kylsystemet behover genomga service pa flera olika satt. Det kan ske genom att derma information visas pa en display i en forarhytt i fordonet 2. Altemativt kan indikeringsanordningen 17 sanda en signal till en verkstad da service av kylaren behover utforas. Dam-led är verkstaden uppmarksammad pa att derma service ska utforas sa snarl fordonet anlander till verkstaden. Enligt ett ytterligare altemativ sa kan information om servicebehovet av kylaren lagras i fordonet pa lampligt satt. Darmed kan detta servieebehov uppmarksammas och atgardas vid nasta tillfálle som fordonet är inne pa en verkstad for flagon annan typ av service, reparation eller liknande. The indicating device 17 may indicate that the cooling system needs to be serviced in several different ways. This can be done by displaying this information on a display in a cab of the vehicle 2. Alternatively, the indicating device 17 can send a signal to a workshop when service by the radiator needs to be performed. Dam-led, the workshop is advised that this service should be performed as soon as the vehicle arrives at the workshop. According to a further alternative, information about the service needs of the radiator can be stored in the vehicle in an appropriate manner. Thus, this need for service can be noticed and taken care of the next time the vehicle is inside a workshop for other types of service, repair or the like.
Fig. 2 visar ett flodesschema som beskriver arrangemangets funktion och grundlaggande steg hos ett forfarande for att diagnosticera ett kylsystems prestanda ett fordon. Styrenheten 13 bar, vid steget a, forsetts med en model M som simulerar driften av kylsystemeten. Driften simul.eras med hjalp av ett flertal ingaende parametrar p, qn dar atminstone en forsta av namnda parametrar p är relaterad till kylsystemets prestanda under drift och dar parametrar utgor driftsparametrar qn som definierar det drifttillstand vid vilket ett varde av den forsta parametern p bestams. Modellen kan alien innefatta fordonsspecifika parametrar som definierar det enskilda fordonets egenskaper. Styrenheten 13 har, vid steget b, tillgang till information SOTT1 definierar en rnaxirnalt acceptabel avvikelse Amax far namnda forsta parameter p vid vilken kylsystemets prestanda har sjunkit till en niva da service av kylsystemet bor. 8 utforas. Styrenheten 13 uppskattar, vid steget c, ett idealt varde p, av namnda fOrsta parameter p med hjalp av model len M. Det ideala vardet pi av namnda forsta parameter p är det varde som parametern p bar cla kylsystemet fungerar pa ett optirnalt satt. Ett kylsystem fungerar pa ett optimalt sat i nyskick. Under drift utsatts kylsystemets ingaende komponenter for slitage och nedsmutsning vilket leder till att kylsystemets prestanda successivt avtar. Genom service av kylsystemet som kan innebara rengoring av kylaren 10 och/eller utbyte av en mindre väl fungerande komponenter kan kylsystemet her erhalla en vasentligen optimal prestanda. Fig. 2 shows a flow chart describing the operation and basic steps of the arrangement of a method for diagnosing the performance of a cooling system in a vehicle. The control unit 13 was, at step a, continued with a model M which simulates the operation of the cooling system. The operation is simulated with the aid of a plurality of input parameters p, where at least one of the first parameters is related to the performance of the cooling system during operation and where parameters constitute operating parameters q which define the operating state at which a value of the first parameter p is determined. The alien model may include vehicle-specific parameters that define the characteristics of the individual vehicle. The control unit 13 has, at step b, access to information SOTT1 defines a externally acceptable deviation Amax gets the said first parameter p at which the performance of the cooling system has dropped to a level when service of the cooling system resides. 8 is performed. The control unit 13 estimates, at step c, an ideal value p, of said first parameter p with the aid of model len M. The ideal value pi of said first parameter p is the value at which the parameter of the bare claw cooling system operates in an optical manner. A cooling system works in an optimal way in new condition. During operation, the cooling system's input components are exposed to wear and dirt, which leads to the cooling system's performance gradually decreasing. By servicing the cooling system, which may involve cleaning the cooler 10 and / or replacing a less well-functioning component, the cooling system here can obtain a substantially optimal performance.
D?t fordonet inte langre ar i nyskick mottar styrenheten 13 under drift, vid steget d, information av ett arvarde par av namnda forsta parameter p, Styrenheten 13 mottar har information fran sensorerna 14a, 14b, 15 avseende kylvdtskans temperatur °eh/eller laddluftens temperatur. Arvardet par av den forsta parametem p är det verkliga vardet av den forsta parametern p i kylsystemet. Eftersom awardet p är relaterat till kylsystemets prestanda kommer det suceessivt att avvika alltmer frail det ideala vardet pi av den forsta parametern i takt med att kylsystemet slits och smutsas net-, korroderar, slits etc. Styrenheten 13 uppskattar, vid steget e, en avvikelse A mellan arvardet par av namnda fOrsta parameter p och det ideala vardet pi. Avvikelsen A kan utgora en skillnad mellan arvardet par och det ideala vardet pi av den forsta parametern, kvoten mellan arvardet par och det ideala vardet pi eller definieras pa nagot annat lampligt sail. When the vehicle is no longer in new condition, the control unit 13 during operation, at step d, receives information of an inherited pair of said first parameter p. The control unit 13 receives information from the sensors 14a, 14b, 15 regarding the temperature of the cooling air and / or the charge air temperature. The inheritance pair of the first parameter p is the actual value of the first parameter p in the cooling system. Since the award p is related to the performance of the cooling system, it will successively deviate from the ideal value pi of the first parameter as the cooling system wears and gets dirty, corrodes, wears, etc. The control unit 13 estimates, at step e, a deviation A between the inheritance pair of said first parameter p and the ideal value pi. The deviation A can be a difference between the inherited pair and the ideal value pi of the first parameter, the ratio between the inherited pair and the ideal value pi or defined on some other suitable sail.
Styrenheten 13 bedomer, vid steget f, om avvikelsen A är stone an den maximalt aceeptabla avvikelsen Amax. Om styrenheten 13 uppskattar att avvikelsen är mindre an den maximalt aceeptabel avvikelsen Amax konstaterar styrenheten 13 att kylsystemet har en tillrackligt hog prestanda och att service av kylsystemet inte är befogat. The control unit 13 judges, at step f, whether the deviation A is stone at the maximum acceptable deviation Amax. If the control unit 13 estimates that the deviation is less than the maximum acceptable deviation Amax, the control unit 13 states that the cooling system has a sufficiently high performance and that service of the cooling system is not justified.
Processen borjar armed om vid steget c, dar styrenheten 13 mottar ett nytt ett arvarde Par av namnda forsta parameter p. Om styrenheten 13 uppskattar att avvikelsen är stone an den tnaxirnalt aeceptabel avvikelsen Amax konstaterar styrenheten 13 att kylsystemets prestanda sjunkit till en niva sá att det behover genomga service. The process starts armed again at step c, where the control unit 13 receives a new one inherited Pair of said first parameter p. If the control unit 13 estimates that the deviation is stone at the externally acceptable deviation Amax, the control unit 13 finds that the cooling system performance has dropped to a level need to undergo service.
Styrenheten 13 aktiverar, vid steget g, indikeringsanordningen 17 som pa lampligt satt pavisar att service av kylsystemet bör utforas. The control unit 13 activates, at step g, the display device 17 which aptly indicates that service of the cooling system should be performed.
Ett fersta mer detaljerat utfaringsexempel Modellen M kan vara utformad pa olika satt. Enligt ett forsta utforingsexempel fOrses styrenheten 13, vid steget a, med en berakningsmodell M som simulerar kylsystemet 9 ett statiskt driftstillstand med hjalp av atminstone en forsta parameter p ach ett antal driftsparametrar q.. Med ett statiskt driftstillstand avses att kylvatskans temperatur kylsystemet ach/eller laddluftens temperatur, som kan definieras som forsta parametrar p, liar ett varde som stabiliserats pa en vasentligen konstant niva liksom ingaende driftsparametrar qn i modellen M vilka kart avse tillfard motoreffekt, motorvarvtal, flakthastighet, retardereffekt, fordonshastighet. Modellen M innehaller aven fordansspecifika parametrar som är relaterad till det fordonets inghende komponenter sasom typ av forbranningsmotor 1, kylare 10, kylflakt 12, kylvatskepurrip 3, oljekylare 6 etc. A first more detailed exemplary embodiment Model M can be designed in different ways. According to a first embodiment, the control unit 13 is provided, at step a, with a calculation model M which simulates the cooling system 9 a static operating state by means of at least a first parameter p ach a number of operating parameters q .. By a static operating condition is meant that the cooling water temperature cooling system ach / or The charge air temperature, which can be defined as the first parameters p, is a value stabilized at a substantially constant level as well as no operating parameters qn in the model M which maps refer to supply engine power, engine speed, flight speed, deceleration power, vehicle speed. Model M also contains vehicle-specific parameters that are related to the components of that vehicle, such as type of internal combustion engine 1, radiator 10, cooling surface 12, cooling water purifier 3, oil cooler 6, etc.
Styrenheten 13 mottar vasentligen kontinuerligt information flan sensorema 14a, 14b, 15 avseende kylvatskan temperatur och laddluftens temperatur som kart avse farsta parametervarden p och information frail enheten 16 avseende ovriga ineende driftsparametrar qn. Styrenheten 13 beraknar vasentligen kontinuerligt derivatan for atminstane ett flertal av namnda parametrar p, qn. DA derivatan for namnda parametrar p, qn understiger ett ph forhand bestamt varde bedams att de liar ett vasentligen konstant varde och att eft statiskt drifttillstand hat. uppnatts. DA det sker beraknar styrenheten 13, vid steget c med hjalp av madellen M och mottagna arvarden av driftsparametrama ett idealt pi av namnda fiirsta parameter p. Den beraknar shledes den temperatur som kylvatskan oeh/eller laddluften skulle ha vid det radande driftsforhallandet am kylsystemet var i nyskick. Ett ytterligare villkor for att styrenheten 13 ska utfora denna bereikning är att kylvatsketemperaturen är hogre an regleringstemperaturen dvs. termostaten är oppen sh att kylarvatska cirkulerar genom kylaren 10. The control unit 13 essentially continuously receives information from the sensors 14a, 14b, 15 regarding the coolant temperature and the charge air temperature, which maps refer to the first parameter value p and information from the unit 16 regarding other incoming operating parameters qn. The control unit 13 essentially continuously calculates the derivative for at least a plurality of said parameters p, qn. The derivative for the said parameters p, qn is less than a ph predetermined value, it is judged that they have a substantially constant value and that according to the static operating state. achieved. When this takes place, the control unit 13, at step c with the aid of the madellen M and the received values of the operating parameters, calculates an ideal pi of the said first parameter p. new condition. An additional condition for the control unit 13 to perform this achievement is that the coolant temperature is higher than the control temperature, ie. the thermostat is open so that coolant water circulates through the cooler 10.
Styrenheten 13 mottar, vid steget d, information fran sensorema 14a, 14b, 15 avseende kylvatskans verkliga temperatur och/eller laddluflens verkliga temperatur dvs. p av namnda forsta parameter p. Styrenheten 13 uppskattar, vid steget e, avvikelsen A mellan det beraknade vardet pi av namnda fOrsta parameter p och det uppmatta arvardet pd., av namnda forsta parameter p. Om avvikelsen overstiger den ph forhand bestamda maximala avvikelsen Amax aktiverar styrenheten 13 b indikeringsorganet 17 som, vid steget g, indikerar att kylsystemet behOver genortigh service. I annat fall fortsatter processen, vid steget c, och berakning av ett nytt av ett nytt idealt varde pi av namnda forsta parameter p sa fort ett nytt statiskt drifttillstand enligt ovan upptrader. The control unit 13 receives, at step d, information from the sensors 14a, 14b, 15 regarding the actual temperature of the cooling water box and / or the actual temperature of the charging air, ie. p of said first parameter p. The control unit 13 estimates, at step e, the deviation A between the calculated value pi of said first parameter p and the measured inheritance pd., of said first parameter p. If the deviation exceeds the ph predetermined maximum deviation Amax the control unit 13b activates the indicating means 17 which, at step g, indicates that the cooling system needs genortigh service. Otherwise, the process continues, at step c, and calculating a new of a new ideal value pi of said first parameter p as soon as a new static operating state as above occurs.
Ett anclra utfOringsexempel Enligt ett andra utfOringsexempel forses styrenheten 13, vid steget a, med en berakningsmodell M som simulerar kylsystemet i realtid med hjalp av atminstone en forsta parameter p och atminstone en driftsparameter qn. Modelien M innehaller aven information om prestanda och driftsegenskaper hos fordonsspecifika komponenter. Modellen innefattar aven simulering av termostatens 8 temperaturregleringsfirnktion. Terinostaten 8 kan vara en passiv kornponent som oppnar och leder kylvatska till kylaren 10 vid en konstant regleringstemperatur. Temiostaten 8 kan altemativt vara aktivt styrd sâ att den leder kylvatska till kylaren 10 vid olika regleringstemperaturcr under varierande drifttillstand. 13erakningsmode1len är i detta fall anpassad att berakna kleala forsta pararnetervarden under lampliga dynamiska drifttillstand. I detta fall beraknar styrenheten 13 med fordel vardet av en forsta parameter p i form av derivatan av kylvatskanstemperatur eller derivatan av laddluftens temperatur. Den forsta parametem p avser i detta fall den hastighet med vilken kylvatskans respektive laddluftens temperatur andras. An other embodiment According to a second embodiment, the control unit 13 is provided, at step a, with a calculation model M which simulates the cooling system in real time by means of at least a first parameter p and at least one operating parameter qn. The M model also contains information on the performance and operational characteristics of vehicle-specific components. The model also includes simulation of the thermostat's temperature control function. The terminus 8 may be a passive grain component which opens and conducts coolant to the cooler 10 at a constant control temperature. The thermostat 8 can alternatively be actively controlled so that it conducts coolant to the cooler 10 at different control temperatures under varying operating conditions. The shaving model is in this case adapted to calculate clear first pair network values under suitable dynamic operating conditions. In this case, the control unit 13 advantageously calculates the value of a first parameter p in the form of the derivative of coolant temperature or the derivative of the charge air temperature. The first parameter p in this case refers to the speed at which the temperature of the cooling water tank and the charge air, respectively, change.
Styrenheten 13 mottar vasentligen kontinuerligt information fran sensorerna 14a, 14b, 15 avseende kylvatskans och/eller laddluftens temperatur. Vid drifttillfallen &á en retarder aktiveras eller da forbranningsmotom erhaller en plotsligt forhajd belastning stiger kylvatskans ternperatur i kylsystemet. Vid drifttilltallen da en forare dapper gaspedalen utan att bromsa efter en hard belastningsperiod farbranningsmotom sjunker kylvatskans temperatur i kylsystemet. Vid ett val fungerande kylsystem sjanker kylvatsketernperaturen snabbare an hos ett mindre vat fungerande kylsystem. Da ett driftstillstand uppkommer, vid vilken kylvatskan eller laddluften erhaller en snabb temperaturandring, beraknar styrenheten 13, vid steget c, ett idealt varde pi av den fOrsta parametem som i detta fall är temperaturderivatan hos kylvatskan. Styrenheten 13 mottar vasentligen samtidigt information fran narnnda sensorer 14a, 14b, 15 avseende kylvdtskans temperatur och laddluftens temperatur och beraknar motsvarande arvarden par fOr den forsta pararnetem p. The control unit 13 essentially continuously receives information from the sensors 14a, 14b, 15 regarding the temperature of the cooling water tank and / or the charging air. In the event of an operation & a retarder is activated or when the combustion engine receives a sudden increased load, the temperature of the cooling water in the cooling system rises. During operation, when a driver depresses the accelerator pedal without braking after a hard load period, the combustion engine lowers the temperature of the coolant in the cooling system. In the case of a select cooling system, the cooling water temperature drops faster than in a less water cooling system. When an operating condition arises in which the coolant or charge air receives a rapid temperature change, the control unit 13, at step c, calculates an ideal value pi of the first parameter which in this case is the temperature derivative of the coolant. The control unit 13 essentially simultaneously receives information from the said sensors 14a, 14b, 15 regarding the temperature of the cooling air and the temperature of the charging air and calculates the corresponding pair values for the first pair unit p.
Styrenheten 13 uppskattar, vid steget c, avvikelsen A mellan det beraknade ideala vardet p av namnda forsta parameter p och det uppmatta arvardet p av namnda fOrsta parameter p. Om avvikelsen Overstiger den pa forhand bestarnda maximalt acceptabla avvikelsen Amax aktiverar styrenheten 13 indikeringsorganet 17 som, vid steget g, indikerar att kylsystemet behover genomgd service. 1 annat fall startar processen, vid 11 steget c, med berakning av ett nytt idealt varde pi av namnda forsta parameter p sa fort ett nytt drifttillstand enligt ovan upptrader. The control unit 13 estimates, at step c, the deviation A between the calculated ideal value p of said first parameter p and the measured inherited value p of said first parameter p. If the deviation exceeds the pre-existing maximum acceptable deviation Amax, the control unit 13 activates the indicating means 17 which, at step g, indicates that the cooling system needs thorough service. Otherwise, the process starts, at step c, calculating a new ideal value pi of said first parameter p as soon as a new operating state as above occurs.
Ett tredjeutforingsexernpel Enligt ett tredje utforingsexempel farses styrenheten 13, vid steget a, riled en berakningsmodell M som innefattar en forsta parameter p och dtminstone en men med fordel ett antal driftsparametrar qn. Aven hdr forses modellen med information avseende prestanda och driftsegenskaper hos det specifika fordonets 2 ingdende komponenter. Styrenheten forses, vid steget b, med information avseende en maximalt acceptabel avvikelse Am av den forsta parameter p frdn ett idealt farsta parametervarde pi som erhalls dd. kylsystemet är nytt och uppvisar en optimal prestanda. Styrenheten 13 motar aven i detta fall information fran enheten 16 avseende de driftparametrar qn som ingar i modellen M. Modellen innefattar aven information om den logik som svarar for styrningen av kylflakten 12, kylvatskepumpen 3, och fOrekommande fall termostaten 8. I detta fall beraknar styrenheten 13 kontinuerligt under drift, med hjalp av modellen M, ett idealt varde pi av den forsta parametem p frail det att kylsystemet startar vilket sker vid steget c. Det beraktiade ideala vardet pi av det forsta parametervardet p, som kan vara kylvdtskans temperatur °eh/eller laddluftens temperatur, jamfars vasentligen kontinuerligt med mottagna temperaturvarden frdn sensorerna 14a, 14b, 15. Styrenheten 13 uppskattar avvikelsen A mellan det ideala vardet pi och arvardet par av den forsta parameteim p vilket sker vid steget e. Avvikelsens A starlek indikerar hur myeket kylsystemets prestanda har forsamrats i forhallande till da det hade en optimal prestanda. Urn avvikelsen overstiger den pd forhand bestamda maximalt acceptabla avvikelsen Amax aktivcrar styrenheten 13 indikeringsorganet 17 som, vid steget g, indikerar att kylsystemet behover genomgd. service. I annat fall fortsatter pro cessen yid steget c. A third embodiment Example According to a third embodiment, the control unit 13 is milled, at step a, by a calculation model M which comprises a first parameter p and at least one but advantageously a number of operating parameters qn. The model is also provided with information regarding the performance and operating characteristics of the specific components of the specific vehicle. The control unit is provided, at step b, with information regarding a maximum acceptable deviation Am of the first parameter p from an ideal first parameter value pi obtained dd. the cooling system is new and shows an optimal performance. The control unit 13 also in this case receives information from the unit 16 regarding the operating parameters qn contained in the model M. The model also includes information on the logic responsible for controlling the cooling surface 12, the cooling water pump 3, and if applicable the thermostat 8. In this case the control unit calculates 13 continuously during operation, with the aid of model M, an ideal value pi of the first parameter p from the start of the cooling system which takes place at step c. The calculated ideal value pi of the first parameter value p, which may be the temperature of the cooling air ° eh / or the charge air temperature, is compared substantially continuously with the received temperature values from the sensors 14a, 14b, 15. The control unit 13 estimates the deviation A between the ideal value pi and the inherited pair of the first parameter p which occurs at step e. The deviation A star level indicates how much the cooling system performance has been assembled in relation to when it had an optimal performance. If the deviation exceeds the predetermined maximum acceptable deviation Amax, the control unit 13 activates the indicating means 17 which, at step g, indicates that the cooling system needs to be inspected. service. Otherwise, the process continues yid step c.
Ndr ett kylsystems prestanda reduceras indste kylflakten 12 och kylvdtskepumpen 3 arbeta hardare for att kylsystemet ska kunna uppratthalla en erforderlig kylning. Nar kylsystemets prestanda sjunker resulterar det i en okad bransleforbrukning hos forbranningsmotorn 1 som driver kylflakten 12 och kylvdtskepumpen 3. Styrenheten kan som ett komplement till att enbart indikera dà det är dags att utfera service av kylsystemet indikera den ailing i branslefOrbrukning som erhalls pga. den prestandasdnkning som kylsystemet erhállit. Metoden M kan ytterligare modifieras sh att den mottar information fran en GPS enhet som upplyser am den framforvarande 12 fardvagen. Med hjalp av denna information och information avseende det specifika fordonets egenskaper kan inkopplingsgraden av kylflakt 12 och kylvatskepump 3 uppskattas och framtida arvarden pqi- och ideala varden pi av den forsta parametem p. When the performance of a cooling system is reduced, the inner cooling surface 12 and the cooling water pump 3 work harder for the cooling system to be able to maintain the required cooling. When the performance of the cooling system decreases, it results in an increased fuel consumption of the internal combustion engine 1 which drives the cooling surface 12 and the coolant pump 3. The control unit can, as a complement to only indicate when it is time to service the cooling system, indicate the ailing in fuel consumption. the performance thinking obtained by the cooling system. Method M can be further modified so that it receives information from a GPS unit illuminating the preceding 12 carriage. With the aid of this information and information regarding the characteristics of the specific vehicle, the degree of engagement of cooling radiator 12 and cooling water pump 3 can be estimated and the future value pqi and ideal value pi of the first parameter p.
Ett fjarde utfOringsexempel Enligt ett fjarde utforingsexemplet frirses styrenheten 13, vid steget a, med en rnodell M av statistiskt slag. Vid steget b, frirses styrenheten 13 med information avseende en maximal acceptabel avvikelse av ett forsta parametervarde p fran ett idealt parametervarde pi. Da kylsystemet är i nyskick skapar styrenheten 13, vid steget c, en forsta ideal databas i den statistiska modellen M. Den ideala databasen innefattar lagrad information avseende ideala pi forsta parametervarden p och driftsparametrar q„ som mottas fran enheten 16 vid lampliga drifttillstand. Foretradesvis skapas en ideal databas med information om ideala frirsta parametervarden pi och driftsparametervarden cin under ett flertal lampliga drifttillstand. Denna databas med ideala parametervarden pi skapas under ett relativt kort period da fordonet är i nyskick och kylsystemet garanterat har en optimal prestanda. A fourth embodiment According to a fourth embodiment, the control unit 13 is frozen, at step a, with a model M of statistical kind. At step b, the control unit 13 is frozen with information regarding a maximum acceptable deviation of a first parameter value p from an ideal parameter value pi. When the cooling system is in new condition, the control unit 13, at step c, creates a first ideal database in the statistical model M. The ideal database includes stored information regarding ideals in the first parameter value p and operating parameters q »received from the unit 16 in suitable operating conditions. Preferably, an ideal database is created with information about the ideal initial parameter value pi and the operating parameter value cin under a plurality of suitable operating conditions. This database with ideal parameter values pi is created in a relatively short period as the vehicle is in new condition and the cooling system is guaranteed to have an optimal performance.
Temperaturderivatan for kylvdtskan i kylsystemet kan, exempelvis, definiera den fOrsta parametern p. Temperaturderivatan fOr kylvatskan vid fullt rippen termostat kan definieras som en funktion av tillforseln av vartneeffekt och bortforsel av varmeeffekt kylsystemet. Varmeeffekt tillfOrs till kylsystemet via fOrbranningsmotom I, laddluftkylaren 7 och oljekylaren 6 dá den är aktiverad. Varmeeffekt bortfrirs fran kylsystemet i kylaren 10. Den bortforda vamieeffektens storlek beror frarnst av den omgivande luftens temperatur och luftflride genam kylaren 10. Luftflridet genom kylaren 10 beror i sin tur pa faktorer sasorn fordonets 2 hastighet, kylflaktens 12 varvtal och fordonsspecifika egenskaper sasom typ av hytt. Den termiska trrigheten har dven en viss betydelse. Lampliga drifttillstand är i dctta fall da temperaturderivatan har ett stort positivt eller negativt varde. Forutom temperaturderivatan sa kan avert den maximala temperaturderivatan definieras som ett idealt forsta parametervarde. Ett stort positivt varde av temperaturderivatan erhalls under ett driftstillstand dä fordonet bromsas med hjalp av retardem. I detta fall tillfrirs en stor mangd varmeeffekt till kylvatskan vilket leder till att kylvatskan temperatur stiger. I ett nytt kylsystem med en optimal prestanda erhal is en effektivare kylning an i ett kylsystem som har en lagre prestanda. Temperaturderivatan och ett maximalt varde av temperaturderivatan blir datmed storre hos kylsystemet med den lagre prestandan an hos kylsystemet med den 13 hogre prestandan. Temperaturderivatan och den maximala temperaturderivatan fOr kylvatskans temperatur är shledes en god indikation p. kylsystemets prestanda. The temperature derivative of the cooling fluid in the cooling system can, for example, define the first parameter p. The temperature derivative of the cooling fluid at a fully ripped thermostat can be defined as a function of the supply of heat output and removal of heat output of the cooling system. Heating power is supplied to the cooling system via the combustion engine I, the charge air cooler 7 and the oil cooler 6 when it is activated. Heat output is released from the cooling system in the radiator 10. The magnitude of the heat dissipated effect depends primarily on the ambient air temperature and airflow through the radiator 10. The airflow through the radiator 10 in turn depends on factors such as vehicle speed 2, radiator speed 12 and vehicle specific characteristics such as cab type. . The thermal dryness also has a certain significance. Appropriate operating conditions are in these cases when the temperature derivative has a large positive or negative value. In addition to the temperature derivative, the maximum temperature derivative can be defined as an ideal first parameter value. A large positive value of the temperature derivative is obtained during an operating condition when the vehicle is braked with the aid of a retarder. In this case, a large amount of heat effect is released to the coolant, which leads to the coolant temperature rising. In a new cooling system with an optimal performance, more efficient cooling is obtained than in a cooling system that has a lower performance. The temperature derivative and a maximum value of the temperature derivative thus become larger in the cooling system with the lower performance than in the cooling system with the 13 higher performance. The temperature derivative and the maximum temperature derivative for the coolant temperature are thus a good indication of the cooling system's performance.
Temperaturderivatans varde eller den maximala temperaturderivatan kan lagras i den I-61-sta databasen som funktion av driftsparametrar qn, som, exempelvis, kan utgoras av kyleffekten i kylaren 10 och forbranningsrnotorns I varvtal. Lampliga drifttillstand erhalls aven da. temperaturderivatan liar eft stort negativt varde. Ett stort negativt varde av temperaturderivata erhalls dá fordonet rullar framht med en relativt hog hastighet utan att gaspedalen eller retandern är aktiverad. 1 detta fall tillfors kylvatskan i 10kylsystemet en betydligt storre kylning i kylaren 10 an den uppvaitiming som den erhaller i forbranningsrnotom 1 och laddluftky1aren 7. I ett kylsystem med en optimal prestanda erhalls en snabbare nedkylning av kylvatskan i detta fall och darmed en temperaturderivata med ett stone negativt varde an i ett kylsystem med en lagre prestanda. En maximalt negativ temperaturderivata eller en minimal kylvatsketemperatur under detta driftstillstand kan alternativt registreras som fOrsta parametrar p. The value of the temperature derivative or the maximum temperature derivative can be stored in the I-61st database as a function of operating parameters qn, which, for example, can be determined by the cooling power in the radiator 10 and the speed of the combustion engine I. Lamply operating condition is obtained even then. the temperature derivative liar eft large negative value. A large negative value of temperature derivatives is obtained when the vehicle rolls forward at a relatively high speed without the accelerator pedal or the retander being activated. In this case, the cooling liquid in the cooling system is supplied with a considerably larger cooling in the cooler 10 than the heating it receives in the combustion engine 1 and the charge air cooler 7. In a cooling system with an optimal performance a faster cooling of the cooling liquid is obtained in this case and thus a temperature derivative with a stone negatively affected in a cooling system with a lower performance. A maximum negative temperature derivative or a minimum coolant temperature during this operating condition can alternatively be registered as the first parameters p.
Under den fortsafta driften av fordonet samlar styrenheten 13, dh. ovan angivna drifttillstand uppkommer in varden avseende den fOrsta parametern p och relaterade driftsparametrar q fran enheten 16. Under en sadan period skapar styrenheten 13 i den statistiska modellen M en andra databas med arvarden av den forsta parametern p och relaterade driftsparametervarden qn. Vid steget e, jamfor styrenheten 13 arvarden av den fOrsta parametern p i den andra databasen med ideala parametervardena i den fOrsta databasen vid motsvarande driftsparametrar qn. Styrenheten 13 uppskattar en avvikelse A mein arvardet hos den fOrsta parametern p och clet ideala vardet pi hos den fOrsta parametem p. Om avvikelsen A overstiger den pa forhand bestanada maximalt aceeptabla avvikelsen Amax aktiverar styrenheten 13 indikeringsorganet 17 som, vid steget g, indikerar att kylsysternet behover genomgh service. II annat fall fortsatter processen vid steget d. I detta fall kan steget c hoppas Over dã ideala varden pi av den forsta parametem p redan firms lagrade i Modellen M. During the continued operation of the vehicle, the control unit 13, ie. the above operating condition arises in the value regarding the first parameter p and related operating parameters q from the unit 16. During such a period, the control unit 13 in the statistical model M creates a second database with the value of the first parameter p and related operating parameter value qn. At step e, the control unit 13 compares the value of the first parameter p in the second database with the ideal parameter values in the first database at the corresponding operating parameters qn. The control unit 13 estimates a deviation A with the value of the first parameter p and the ideal value pi of the first parameter p. If the deviation A exceeds the pre-existing maximum acceptable deviation Amax, the control unit 13 activates the indicating means 17 which, at step g, indicates that the cooling system indicates need genomgh service. In another case, the process continues at step d. In this case, step c can be skipped Over the ideal value pi of the first parameter p already firms stored in Model M.
I detta fall behOvs inga sarskilda berakningar utforas som tar hansyn till det specifika fordonets och dess inghende komponenter dã ideala varden pi av parametervardet p och relaterade driftsparametrar qn mottas och lagras i en forsta da.tabas d fordonet är i nyskiek. Ett sadant arrangemang fOr att diagnosticera ett kylsystem i ett fordon kan 14 infOras pa alla typer av fordon utan att det behover anpassas till specifik fordonstyp och ingaende komponenter. In this case, no special calculations need be performed that take into account the specific vehicle and its constituent components then the ideal value pi of the parameter value p and related operating parameters qn are received and stored in a first da.tabase d the vehicle is in nyskiek. Such an arrangement for diagnosing a cooling system in a vehicle can be introduced on all types of vehicles without the need to adapt to specific vehicle type and components.
Uppfinningen är pa intet satt begransad till den utforingsform som beskrivs pa ritningen utan kan varieras fritt inom patentkravens ramar. Kylsystemet kan ha en vasentligen godtycklig utformning och kyla ett godtyckligt antal komponenter eller medier. De olika modellema kan aven kombineras med varandra pa ctt lampligt satt. The invention is in no way limited to the embodiment described in the drawing but can be varied freely within the scope of the claims. The cooling system can have an essentially arbitrary design and cool any number of components or media. The different models can also be combined with each other in an appropriate way.
Claims (20)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1351238A SE539360C2 (en) | 2013-10-18 | 2013-10-18 | Arrangement and procedure for diagnosing a cooling system in a vehicle |
| PCT/SE2014/051101 WO2015057128A1 (en) | 2013-10-18 | 2014-09-25 | Arrangement and method to diagnose a cooling system in a vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| SE1351238A SE539360C2 (en) | 2013-10-18 | 2013-10-18 | Arrangement and procedure for diagnosing a cooling system in a vehicle |
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| SE1351238A1 true SE1351238A1 (en) | 2015-04-19 |
| SE539360C2 SE539360C2 (en) | 2017-08-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864037A (en) * | 2021-09-24 | 2021-12-31 | 中国第一汽车股份有限公司 | Test rapid cooling control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5020007A (en) * | 1988-03-10 | 1991-05-28 | Wu Samuel C | Method for monitoring the health of physical systems producing waste heat |
| DE10001713A1 (en) * | 2000-01-18 | 2001-07-19 | Bosch Gmbh Robert | Fault detection in cooling system for motor vehicle engine involves comparing variation of actual temperature with two model temperature ranges to determine if fault is in sensor or valve |
| DE10019419A1 (en) * | 2000-04-19 | 2001-10-25 | Bosch Gmbh Robert | Cooling system for motor vehicle detects faulty positioning of cooling flow closure unit from variation with time of temperature difference between model and actual temperature variation |
| DE102004040327A1 (en) * | 2004-08-20 | 2006-03-09 | Volkswagen Ag | Vehicle`s cooling system performance monitoring device, has device measuring temperature difference, where cooling performance efficiency signal is displayed upon comparison with target differential input that is found based on difference |
| US7918129B2 (en) * | 2008-05-27 | 2011-04-05 | GM Global Technology Operations LLC | Diagnostic systems for cooling systems for internal combustion engines |
| US8370052B2 (en) * | 2008-10-22 | 2013-02-05 | Caterpillar Inc. | Engine cooling system onboard diagnostic strategy |
-
2013
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| CN113864037A (en) * | 2021-09-24 | 2021-12-31 | 中国第一汽车股份有限公司 | Test rapid cooling control method |
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| WO2015057128A1 (en) | 2015-04-23 |
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