• 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:
    A method for determining a parameter has a cooling water system (1) designed to cool an engine (3) of a motor vehicle by sensing the air pressure in the volume (9) above the cooling water surface in an expansion vessel (5) and supplying air to this volume at needs thereof include recording of data relating to such air supply, storing and summarizing such data for a period of the vehicle and comparing it with '
    公开号:SE1351321A1
    申请号:SE1351321
    申请日:2013-11-08
    公开日:2015-05-09
    发明作者:Svante Johansson；Sofie Jarelius；Stig Hildahl；Mattias Strindlund
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    2 let, for example via some substandard weld in the expansion vessel or an untied lid of the vessel.
    If the said air pressure and thus system pressure is applied due to such faults, bubbles can form in the cooling water via a cooling water pump entering the system and damage can be caused to the pump. There can also be problems with boiling the coolant in the entire coolant system if the system pressure is generally applied.
    It is because of these possible serious consequences of a proposed system pressure that the air pressure in the volume above the coolant surface in the expansion vessel is measured and a device is provided for supplying air to the volume when this is deemed necessary. For adequate pressurization of the coolant system, this is normally also provided with an overpressure valve to release air from said volume if the air pressure reaches a predetermined level and a valve for enabling intake of air in the volume when the engine has stopped and the coolant in the system cools for that no negative pressure should then arise in the system.
    BACKGROUND ART The above reasoning shows that it is unreasonable to determine the operability of a coolant system designed to cool an engine has a motor vehicle, and for this reason a variety of pressure monitoring methods have been proposed in such a system. Such a method is, for example, edge by US 20130067994, which describes a method for diagnosing coolant leakage from an internal combustion engine. The method described therein is based on a pressure profile in the coolant system, which is created during a certain time when the pressure in the system is measured.
    SUMMARY OF THE INVENTION The object of the present invention is to provide a method of initially defined kind, which is improved in at least some respect with respect to prior art such methods.
    This object is achieved according to the invention by providing such a method with the features drawn up in the jug-drawing part of claim 1.
    By inventively registering said data regarding the supply of air to the volume of the expansion vessel, all summarize during a driving period of the vehicle either a specified time of at least 50 hours or between two inspections of the vehicle recorded data and compare these summarized the value with known the value of such data, a performance parameter can be reliably determined. This parameter can then be used to assess, in connection with an inspection incident on the vehicle Ora, whether action should be taken to avoid any acute fault occurring in the coolant system in the next inspection incident or simply to improve the functionality of the coolant system. costs for energy and / or components of the motor vehicle. The procedure is thus not aimed at detecting any sudden-onset acute faults in the coolant system, for this there is other equipment in a motor vehicle, 4 but may detect faults of a lesser dignity but which spirit may need to be remedied and which in the long run can lead to problems of any kind.
    According to an embodiment of the invention, the method is carried out on a coolant system with a device designed to supply air to said volume when said sensing shows that the air pressure in said volume either at night a lower spruce value or an error value deviating from a predicted value by at least a predetermined amount. In this case, the method advantageously comprises the step of performing during the engine operation an averaging of either the volume air pressure or a deviation of the measured pressure from the pressure prevailing under radiating conditions for a period of at least one minute or at least three minutes, and determining that the lower spruce value at night when the mean value of the air pressure during such a period of time reaches the lower spruce value and that said error value at night when the mean value of said deviation during such a time period exceeds said amount. Namely, the pressure of the volume will become accustomed as a function of operating failure and must then be regulated against the presumed pressure in the operating operation that is currently occurring. However, there is a risk of control errors due to different accuracy in presumed pressure and measured pressure, which is why the mean averaging neutralizes such control errors, so that the pressure is not regulated unnecessarily, which would lead to pump losses.
    According to another embodiment of the invention, said lower spruce value is selected depending on the operating case of the vehicle, external conditions, such as humidity and temperature, and / or the measured temperature of the coolant in the coolant system. According to another embodiment of the invention, the lower spruce value mentioned can be set to be in the range 1.2 - 1.6 bar, in the range 1.3 - 1.6 bar or 1.4 bar. This Or appropriate value to avoid the occurrence of the above-mentioned problems with proposed system pressure.
    According to another embodiment of the invention, each time there is a need for supply of air to said volume, an equal amount of air is indicated to said volume. As a variant of this, when there is a need for supply of air to said volume, air to said volume is indicated until a certain level of the air pressure therein has been reached, and this level can advantageously be in the range 1.8 - 2.1 bar. or 1.9 bar.
    According to an embodiment of the invention, in step c) the number of times air supply to the volume has taken place during said corps period is compared with the number of times such supply has taken place in other coolant systems with different values of said performance parameters. As a result, a reliable fault in the coolant system, such as for example some leakage in connection with the expansion vessel, can be detected by a thorough comparison showing that air supply to the volume in the expansion vessel during the said corps period occurred more times than can be expected in the absence of such leakage or only occurrence. of an acceptable such coating.
    According to another embodiment of the invention, in step c) the total amount of air supplied to said volume during said body period is compared with the amount of air supplied in other said coolant systems with different values of said performance parameters. The total amount of air supplied to the volume during the said cooling period also constitutes a reliable measure of the coolant system's operability in terms of leakage. Thus, the supplied air volume / time becomes a measure of the operability parameter.
    According to another embodiment of the invention, the value of said data recorded during a corpse period of the vehicle is stored and summarized in the interval 100 - 1000 hours, in step b).
    A named torque period between two inspections of a motor vehicle is typically in this order of magnitude.
    The invention also relates to a computer program having the sardra features listed in claim 12, a computer program product having the sardra features listed in claim 13, an electronic control unit having the sardra features listed in claim 14 and a motor vehicle according to claim 15.
    Other advantageous features and advantages of the invention will become apparent from the following description.
    BRIEF DESCRIPTION OF THE DRAWINGS Hereinafter described as examples apply embodiments of the invention with reference to the accompanying drawings, in which: Fig. 1 is a schematic sketch of a part of a coolant system designed to cool an engine of a motor vehicle, in which a method according to the invention is applicable, Fig. 2 is a graph illustrating a typical development of the air pressure in the volume above the cooling water surface in the expansion vessel of a cooling water system according to Fig. 1 and the temperature of the cooling water in the cooling water system over time, Fig. 3 is a river diagram showing a process according to an embodiment of the invention, and Fig. 4 is a schematic diagram of an electronic control unit for implementing a method according to the invention.
    DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION With reference to Fig. 1, a very simplified coolant system designed to cool an engine of a motor vehicle and to which the method according to the invention is applicable will now be described. The coolant system 1 comprises a pump 2 designed to pump coolant in a loop past an engine 3 of a motor vehicle 4 to cool parts of the engine. In the floodwater system of the cooling water system, an expansion vessel 5 is arranged to enable the volume change that the cooling water experiences when its temperature changes. In the very simplified figure, a thermostat 6 and a cooler 7 for absorbing heat energy from the cooling water, which it has absorbed in its contact with the engine 3, are also shown.
    Means 8 are provided to frame the air pressure in the volume 9 above the cooling water surface 10 in the expansion vessel. Furthermore, there is a schematically indicated device 11 designed to supply air to the volume 9 during operation of the engine in the event of a predetermined result 8 of said means 8 sensing 8 indicating a need for such an air supply. Consequently, active pressurization of the coolant system takes place, so that it is ensured that the system pressure of the coolant system is kept within acceptable limits by keeping the air pressure in volume 9 within predetermined limits. An electronic control unit 12 is arranged to receive information from the means 8 and on the basis thereof control the device 11.
    Fig. 2 shows how for a motor vehicle in the form of a truck the temperature T of the coolant in a coolant system for cooling the engine and the air pressure P in said volume 9 of the expansion vessel 5 can develop over time t during operation of the truck. It has an operating time of about 2 weeks, and it has been shown that the truck stands still with the engine switched off for about 30 hours after about 200 hours. The reason why the temperature of the coolant fluctuates during the vehicle's corning is that a flap that cooperates with the radiator causes cooling of the coolant is activated intermittently at a certain temperature of the coolant, for example 80 ° C, and then sibs off when reaching for example 70 ° C. The air pressure in volume 9 also varies depending on the temperature of the coolant and on the varying operating conditions of the vehicle and any faults in the coolant system, such as perfectly acceptable, normal smart paint or paint of undesirable size. It appears that the air pressure during the first 200 hours drops from an overpressure of about 0.7 bar to an overpressure of about 0.4 bar, ie. a pressure of 1.4 bar. This could be completely normal and depend on a certain awkwardness of a lid of the expansion vessel 5. Said device 11 could be designed to supply air to the volume 9 when the sensing of the means 8 shows that the air pressure in the volume at night a lower spruce value, which has for example could be 1.3 9 bar, ie. an overpressure of 0.3 bar. During the operation of the engine, an average formation of the air pressure in the volume is preferably performed over a period of at least 1 minute, advantageously at least 3 minutes, and that said lower spruce value is considered night only when this average spike gets the air pressure during such a time period. of, for example, 1.3 bar. It is also possible to compare the applied pressure with the pressure expected at radiating temperature, engine speed, etc. and consider the difference as an error. If such an error in means over time exceeds a certain level, air is then supplied.
    Fig. 3 shows a river diagram illustrating a method according to an embodiment of the invention for determining a parameter regarding the operability of a named cooling water system of the type described above. In a first step Si the air pressure is measured in volume 9 of the cooling vessel system expansion vessel 5. Then the question of supply of air is asked in step S2 and to produce an answer to this question the said mean value formation and comparison with a named lower spruce value for the air pressure is performed.
    If the answer to the question is yes, in step S3 air is supplied to the said volume.
    Regardless of the answer to the question, steps Si and S2 are repeated during engine operation. When air is supplied, step S4 records data regarding the supply of air, such as the amount of air supplied or that air supply has taken place once. Thereafter, the values of the said data are stored in step S5, where in step S6 the question is asked whether a predetermined corps period has ended, such a predetermined corpus period being either a predetermined period of at least 50 hours, such as 300 hours, or the cross period between two supervised cases at the vehicle. The latter driving period is, for example, typically about 500-1000 hours for trucks and buses in long-distance traffic and 500 hours for vehicles in mining. Should a certain period be applied as a predetermined corps period and the period between two supervisory cases be shorter, then the answer to the question will be no. If the answer to the question is not returned to Si, but if the answer to the question is yes, in step S7 a summary of the stored values is performed (by this is meant that you look at the whole of the stored values), warp in step Ss the summarized values are compared with the known value of the said data. In step S9, a performance parameter of the coolant system is determined based on this comparison. For example, the development that the air pressure in the volume has in the operation illustrated in Fig. 2 could be the normal, and then a faster fall of the pressure and a more frequent supply of air to the volume during the said torque period of the vehicle would indicate the presence of a non acceptable paint, which can then be remedied in the said inspection case of the vehicle to avoid major problems occurring during continued operation of the vehicle.
    Computer program code for implementing a method according to the invention is suitably included in a computer program which can be loaded into the internal memory of a computer, such as the internal memory of an electronic control unit of a motor. Such a computer program is suitably provided via a computer program product comprising a data storage medium which can be read by an electronic control unit, which data storage medium has the computer program stored there. Said data storage medium is, for example, an optical data storage medium in the form of a CD-ROM, a DVD disc, etc., a magnetic data storage medium in the form of a hard disk, a floppy disk, a cassette tape, etc., or a flash memory or a memory of type ROM, PROM, EPROM or EEPROM. Fig. 4 very schematically illustrates an electronic control unit 12 comprising an execution means 13, such as a central processor unit (CPU), for executing computer software. The execution means 13 communicates with a memory 14, for example of the RAM type, via a data bus 15. The control unit 12 also comprises data storage medium 16, for example in the form of a Flash memory or a memory of the type ROM, PROM, EPROM or EEPROM. The execution means 13 communicates with the data storage medium 16 via the data bus 15. A computer program comprising computer program code for implementing a method according to the invention, for example in accordance with the embodiment illustrated in Fig. 3, is stored on the data storage medium 16.
    The invention is of course not limited in any way to the embodiments described above, but a number of possibilities for modifications thereof should be obvious to a person skilled in the art without departing from the scope of the invention as defined in the appended claims.
    The engine cooled by the coolant system can be of various types, such as an internal combustion engine, an electric motor, a hybrid system (cooperating electric and internal combustion engine), etc. 12
    权利要求:
    Claims (15)
    [1]
    A method for determining a parameter relating to the operability of a coolant system (1) designed to cool an engine (3) of a motor vehicle (4), the coolant system comprising an expansion vessel (5), means (8) for sensing the air pressure in the volume (9) above the cooling water surface (10) in the expansion vessel (5) and a device (11) designed to supply air to said volume (9) during operation of the engine upon occurrence of a predetermined result of said means (8) sensing indicating a need for such air supply, characterized by the following steps: a) recording of data relating to each said supply of air to said volume (9), b) storing and summarizing the value of said data recorded during a corporation period of the vehicle (4), which extends either over a specified period of at least 50 hours or between two inspections of the vehicle (4) c) comparing said summary value with the known value of said data of a named coolant system m (1), and d) determining a parameter regarding the operability of the coolant system (1) based on said comparison.
    [2]
    Method according to claim 1, characterized in that it is carried out on a cooling water system with a device (11) designed to supply air to said volume (9) when said sensing shows that the air pressure in said volume at night is either a lower limit value or an error value that deviates from an expected value by at least a predetermined amount.
    [3]
    Method according to claim 2, characterized in that it comprises the step of performing during the operation of the engine (3) a mean value formation of either the air pressure supplied in the volume (9) or a deviation of the measured pressure from under radiating conditions related. pressure for a period of time of at least one minute or at least three minutes, and determining that said lower spruce value night when the mean value increases the air pressure during such a time period night the lower spruce value and that said error value night when the mean value of said deviation during such a time period exceeds said amount.
    [4]
    Method according to claim 2 or 3, characterized in that said lower spruce value is selected depending on the operating case of the vehicle (4), external conditions, such as humidity and temperature and / or measured temperature of the coolant in the coolant system (1).
    [5]
    A method according to any one of claims 2-4, characterized in that said lower spruce value is set to be in the range 1.2-1.6 bar, in the range 1.3-1.6 bar or 1.4 bar.
    [6]
    A method according to any one of the preceding claims, characterized in that the usual occurrence of a need for supply of air to said volume (9) indicates an equal amount of air being supplied to said volume. 14
    [7]
    A method according to any one of claims 1-5, characterized in that the usual occurrence of a need for supply of air to said volume (9) indicates air is supplied to said volume until a certain level of the air pressure therein has been reached.
    [8]
    A method according to claim 7, characterized in that said level is in the range 1.8-2.1 bar or 1.9 bar.
    [9]
    Method according to any one of the preceding claims, characterized in that in step c) the number of times air supply to the volume (9) has taken place during said cooling period is compared with the number of times such supply has taken place in other said coolant systems (1) with different values of said performance parameters.
    [10]
    A method according to any one of claims 1-8, characterized in that in step c) the total amount of air which continues to be said volume (9) during said body period is compared with the amount of air supplied in other said coolant systems (1) with different values of the mentioned functional parameters.
    [11]
    A method according to any one of the preceding claims, characterized in that in step b) the value of said data recorded during a body period of the vehicle is stored and summarized in the interval 100-1000 hours.
    [12]
    A computer program that is rechargeable to the internal memory has a computer, the computer program comprising computer program code for causing the computer to control the steps according to any of claims 1-11 when said computer program [Kars on the computer.
    [13]
    A computer program product comprising a computer storage medium readable by a computer, wherein the computer program code of a computer program according to claim 12 is stored on the data storage medium.
    [14]
    An electronic control unit comprises a coolant system comprising an execution means (13), a memory (14) connected to the execution means and a data storage medium (16) connected to the execution means, the computer program code of a computer program according to claim 12 being stored on said data storage medium ( 16).
    [15]
    A motor vehicle, characterized in that it comprises an electronic control unit (13) according to claim 14, and that it is a wheeled motor vehicle, such as a truck or bus. -Fig I gaimmilk nimmilimup 11111111111111111 1111111111111919111111711111111111 • RiiL, 41111111111111111111111IIII '1 "11111 MEW'" INIVrq PIMA TM! Li L DI OZ GE cw OS 09 DL 08 06 ODI "Fig No Supply of air pressure in volume of expansion vessel1- Need a supply of air IJa Air is supplied Registration of data regarding the supply of air Storage of the value of the said data Has a pre-determined corps period ended No Summary of the stored values 1 Comparison of the summarized values nenda kanda Arden on the said data of the coolant system Determination of functionality parametersP S9 "1- / It qLj
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    同族专利:
    公开号 | 公开日
    DE112014004705B4|2020-10-15|
    DE112014004705T5|2016-06-30|
    SE538478C2|2016-07-26|
    WO2015069172A1|2015-05-14|
    引用文献:
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    DE102009018012B4|2009-04-18|2021-02-04|Daimler Ag|Method for controlling the system pressure in a coolant circuit|
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    DE102011108007A1|2011-07-19|2013-01-24|Daimler Ag|Method for controlling system pressure in refrigerant circuit of e.g. diesel engine of motor car, involves adjusting target pressure in refrigerant circuit, and checking or controlling tightness of circuit based on adjusted pressure|
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    法律状态:
    2021-06-29| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1351321A|SE538478C2|2013-11-08|2013-11-08|Method for determining a performance parameter of a coolant system|SE1351321A| SE538478C2|2013-11-08|2013-11-08|Method for determining a performance parameter of a coolant system|
    PCT/SE2014/051294| WO2015069172A1|2013-11-08|2014-11-03|Method for determining an operability parameter of a cooling fluid system|
    DE112014004705.8T| DE112014004705B4|2013-11-08|2014-11-03|Method for determining an operability parameter of a coolant system|
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