• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    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).
    公开号:SE1351238A1
    申请号:SE1351238
    申请日:2013-10-18
    公开日:2015-04-19
    发明作者:Ola Hall；Hans Wikström
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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 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.
    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.
    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.
    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.
    The control unit 13 activates, at step g, the display device 17 which aptly indicates that service of the cooling system should be performed.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    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.
    权利要求:
    Claims (20)
    [1]
    An arrangement for diagnosing a cooling system in a vehicle, the arrangement comprising a control unit (13) comprising or having access to a model (M) which simulates operation of the cooling system by means of a plurality of input parameters (p, with which model ( M) it is possible to determine an ideal value (pi) of at least one first parameter (p) which is related to the performance of the cooling system, the control unit (13) being adapted to estimate an ideal value (pi) of the first parameter (p). using 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 ), characterized by the control unit (13) having access to information regarding a maximum acceptable deviation (Amax) for the first parameter (p) at which service of the cooling system should be performed and that the arrangement comprises an indicating device (17) which is adapted to demonstrate that service of the cooling system should be carried out if the deviation (A) is the maximum acceptable deviation (Amax).
    [2]
    Arrangement according to claim 1, characterized in that the control unit (13) is adapted to calculate the ideal value (pi) of the first parameter (p) by means of naninda model (M),
    [3]
    Arrangement according to claim 2, characterized in that the control unit is adapted to calculate the ideal value (pi) of the first parameter (p) by means of a model (M) which simulates operation of the cooling system when it is in a static operating state.
    [4]
    Arrangement according to claim 2, characterized in that the control unit is adapted to calculate the ideal value (pi) of the first parameter (p) with the aid of a model! (M) which simulates operation of the cooling system in real time.
    [5]
    Arrangement according to claim 2, characterized in that the control unit is adapted to calculate the ideal value (pi) of the first parameter (p) with the aid of said model (M) substantially continuously during operation of the cooling system.
    [6]
    Arrangement according to claim 1, characterized by the steps of obtaining an ideal value (pi) of said first parameter (p) and a value of atrninstone an operating parameter (q, i) dd. The cooling system is in new condition and to store this information in a database that is included in the narrative model.
    [7]
    Arrangement according to claim 6, characterized in that the control unit (13) is adapted to receive information regarding the draft of the first parameter and the said operating parameter (qn) which is included in the model (M) and to estimate a deviation (A) between an inheritance value ( pa) and the stored t ideal value (pi) of said first parameter (p) when the control unit (13) receives a value of said operating parameter (cp.) which corresponds to the stored value of the operating parameter (qn).
    [8]
    Arrangement according to one of the preceding claims, characterized in that the first parameter (p) is the temperature or derivative of the temperature of a cooling liquid circulating in the cooling system.
    [9]
    Arrangement according to any one of the preceding claims, characterized in that the control unit (13) is adapted to obtain information from a sensor (14a, 14.13, 15) which senses a value which is related to said first parameter (pair).
    [10]
    An arrangement according to any one of the preceding claims, characterized in that said indicating device (17) is adapted to indicate that the cooling system needs to be serviced by displaying this information on a display in a vehicle compartment in the vehicle, sending the information to a workshop or storing the information in the vehicle. .
    [11]
    A method of diagnosing a cooling system in a vehicle, the method comprising the steps of 1. using a model! (M) which simulates the operation of the cooling system by means of a plurality of input parameters (p, qn) where at least one of the first parameters (p) is related to the performance of the cooling system during operation, 2. obtaining information on a maximum acceptable deviation (Amax) for said first parameter (p) at which the performance of the cooling system has dropped to a level requiring service of the cooling system, 3. estimate an ideal value (pi) of said first parameter (p) using the current value of other input parameters (qn) in the model (M), 4. receive information regarding a drvd.rde (pgx) of narrmda first parameter (p), 17 5. determine a deviation (A) between the inheritance (pair) and the ideal value (pi) of the said first parameter (p), 6. beclorna orn deviation (A) at stone at the maximum acceptable deviation (Amax) and g) indicate that service of the cooling system should be performed at the deviation (A) is stone at the maximum acceptable deviation (Amax).
    [12]
    A method according to claim 11, characterized in that the step of estimating the ideal value (pi) of the first parameter (p) by calculating it using said model] (M).
    [13]
    A method according to claim 12, characterized by the step of calculating the ideal value (pi) of the first parameter (p) by means of a model (M) which simulates operation of the cooling system when it is in a static operating state.
    [14]
    A method according to claim 12, characterized by the step of calculating the ideal value (pi) of the first parameter (p) using a model! (M) which simulates operation of the cooling system in teal time.
    [15]
    A method according to claim 12, characterized by the step of calculating the ideal value (p) of the first parameter (p) by means of said model] (M) substantially continuously during operation of the cooling system.
    [16]
    A method according to claim 11, characterized by the steps of obtaining an ideal value (pi) of said first parameter (p) and a value of at least one operating parameter (q „) cla the cooling system is in new condition and storing this information in a database.
    [17]
    A method according to claim 16, characterized by the step of receiving information regarding the inheritance of the first parameter and the operating parameter (q „) during a subsequent operation of the cooling system and estimating a deviation (A) between an inheritance value (pair) and the stored ideal value (pi) of the first parameter (p) cla the operating parameters (ci „) had the corresponding value.
    [18]
    A method according to any one of the preceding claims 11-17, characterized by the step of utilizing a first parameter (p) which is constituted by the temperature or derivative of temperature of a cooling vessel circulating in the cooling system. 18
    [19]
    A method according to any one of the preceding claims 11-18, characterized by the step of obtaining information from a sensor (14a, 14b, 15) which detects the true value of the first parameter (pair).
    [20]
    A method according to any one of the preceding claims 11-19, comprising the step of indicating that the cooling system needs to refurbish service by displaying all 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. 8 9 17 16 14a 13 000000 uuuuu J 12 2/2: y __, - g Service
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    同族专利:
    公开号 | 公开日
    SE539360C2|2017-08-08|
    WO2015057128A1|2015-04-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    DE10019419A1|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|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|2008-05-27|2011-04-05|GM Global Technology Operations LLC|Diagnostic systems for cooling systems for internal combustion engines|
    US8370052B2|2008-10-22|2013-02-05|Caterpillar Inc.|Engine cooling system onboard diagnostic strategy|
    法律状态:
    2021-06-01| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1351238A|SE539360C2|2013-10-18|2013-10-18|Arrangement and procedure for diagnosing a cooling system in a vehicle|SE1351238A| SE539360C2|2013-10-18|2013-10-18|Arrangement and procedure for diagnosing a cooling system in a vehicle|
    PCT/SE2014/051101| WO2015057128A1|2013-10-18|2014-09-25|Arrangement and method to diagnose a cooling system in a vehicle|
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