• 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:

    公开号:SE1051168A1
    申请号:SE1051168
    申请日:2010-11-09
    公开日:2012-05-10
    发明作者:Tony Stroemberg
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    A further object of the present invention is to provide a system for controlling the speed of a hydraulically driven fan motor arranged for variable speed, which ensures the service life of hydraulic components.
    SUMMARY OF THE INVENTION These and other objects, which appear from the following description, are achieved by means of a method, system and motor vehicle of the kind initially indicated and which further exhibit the features set forth in the characterizing part of appended independent claims 1, 6 and 12.
    Preferred embodiments of the method and system are defined in appended dependent claims 2-5 and 6-11.
    According to the invention, the objects are achieved with a method for controlling the speed of a hydraulically driven fan motor arranged for variable speed based on ambient atmospheric pressure, comprising the step of determining said ambient atmospheric pressure, comprising the step of limiting the speed not to exceed a predetermined threshold threshold. This makes it possible to ensure the service life of hydraulic components such as the kt motor.
    According to the threshold value based on component performance instead of the cooling requirement an embodiment of the method is selected, said predetermined fan motor is arranged to satisfy. This makes it possible to optimize the cooling with regard to the performance of hydraulic components such as a fan motor to the extent that it is possible to ensure the service life of said hydraulic components.
    According to an embodiment of the method, the step of determining said atmospheric pressure comprises determining the actual altitude. In this way, the altitude is used to determine the atmospheric pressure, which enables redundancy in that the atmospheric pressure can be determined in two ways, so that in case the determination of the atmospheric pressure directly by means of a barometer should fail, the atmospheric pressure can still be determined.
    According to one embodiment of the method, said predetermined threshold value exceeds the speed applied at sea level. This makes it possible to maintain a higher speed at a higher altitude.
    According to one embodiment of the method, said component performance comprises the performance of at least one of the components fan motor and hydraulic pump. In this way, the service life of these components can be ensured.
    According to the invention, the objects are also achieved with a system for controlling the speed of a hydraulically driven fl motor arranged for variable speed based on ambient atmospheric pressure, comprising means for determining said ambient atmospheric pressure, comprising means for limiting the speed not to exceed a predetermined indefinite threshold value. said atmospheric pressure. This makes it possible to ensure the service life of hydraulic components such as the fl motor.
    According to an embodiment of the system, said predetermined threshold value is arranged to be selected based on component performance instead of the cooling need the fan motor is arranged to meet. This makes it possible to optimize the cooling with regard to the performance of hydraulic components such as a fan motor to the extent that it is possible to ensure the service life of said hydraulic components.
    According to an embodiment of the system, said means for determining said atmospheric pressure comprises means for determining current altitude.
    In this way, the height above sea level is used to determine the atmospheric pressure, which enables redundancy in that the atmospheric pressure can be determined in two ways so that in case the determination of the atmospheric pressure directly by means of a barometer should fail, the atmospheric pressure can still be determined. According to an embodiment of the system, said predetermined threshold value is arranged to exceed the speed applied at sea level. This makes it possible to maintain a higher speed at a higher altitude.
    According to one embodiment of the system, said component performance comprises the performance of at least one of the components fan motor and hydraulic pump. In this way, the service life of these components can be ensured.
    According to an embodiment of the system, said fan motor is arranged to be driven by means of a hydraulic pump, which hydraulic pump is calibrated for a certain According to the atmospheric pressure at sea level. atmospheric pressure. a variant is the hydraulic pump calibrated for FIGURE DESCRIPTION The present invention will be better understood with reference to the following detailed description read in conjunction with the accompanying drawings, in which like reference numerals refer to like parts throughout the many views, and in which: Fig. 1 schematically illustrates a side view of a motor vehicle.
    Fig. 2 schematically illustrates a hydraulic system.
    Fig. 3 schematically illustrates a block diagram of a system for controlling the speed of a hydraulically driven fan motor arranged for variable speed according to an embodiment of the present invention; and Fig. 4 schematically illustrates a block diagram of a method for controlling the speed of a hydraulically driven fan motor arranged for variable speed according to an embodiment of the present invention. DESCRIPTION OF EMBODIMENTS Herein, the term "link" refers to a communication link which may be a physical line, such as an optoelectronic communication line, or a non-physical line, such as a wireless connection, for example a radio or microwave link. k.
    Fig. 1 schematically shows a side view of a motor vehicle 1 according to the present invention. The exemplary vehicle 1 consists of a heavy vehicle in the form of a bus. Vehicle 1 can alternatively be a truck or a car.
    The motor vehicle 1 comprises a system for controlling the speed of a hydraulically driven gear motor arranged for variable speed according to the present invention.
    Fig. 2 schematically illustrates a hydraulic system 10 comprising a variable hydraulic pump 12 arranged to hydraulically drive a fan motor 14 included in the hydraulic system 10 with a fan 15. The hydraulic system 10 further comprises an oil container 16 for housing oil O. The hydraulic system 10 further comprises an oil cooler 18 for to cool heated oil. The hydraulic system 10 further comprises a charge air cooler 20 arranged to cool charge air A. The hydraulic system 10 also comprises a radiator 22 for water cooling.
    The hydraulic pump 12 is arranged to pump oil 0 from the oil container 16 based on a requested pressure, the oil being arranged to flow in a circuit with a corresponding flow rate to drive the fan motor 14 of the fan 15 so that the fan rotates at a speed corresponding to the amount of oil passing the fan motor 14 per unit time. The fan 15 is arranged to suck in air A via the charge air cooler 20, the air according to one variant being used for cooling components and according to another variant being used for heating.
    The oil is arranged to flow in the circuit through said oil cooler where the oil is arranged to be cooled. The oil is further arranged so that after cooling by means of the oil cooler flow in the circuit back to the oil container 16. The hydraulic pump 12 is arranged to be calibrated at a certain atmospheric pressure, according to an embodiment at the atmospheric pressure prevailing at sea level, so that 12 at that atmospheric pressure corresponds to a certain speed of the fan motor. a certain hydraulic pressure of the hydraulic pump calibrated The hydraulic pump is connected to an electronic control unit 100. The electronic control unit 100 is arranged to send a signal to the hydraulic pump 12 to limit the speed so as not to exceed a predetermined threshold value regardless of the atmospheric pressure. The 100 is atmospheric pressure determine which estimated speed the requested speed the electronic control unit arranged to based on current results in. The electronic control unit 100 is further arranged to determine which hydraulic pressure at the current atmospheric pressure results in a fl speed that does not exceed said threshold value.
    Fig. 3 schematically illustrates a block diagram of a system 50 for controlling the speed of a hydraulically driven fan motor arranged for variable speed according to an embodiment of the present invention.
    The system comprises an electronic control unit 100 for controlling the speed of a hydraulically driven fan motor arranged for variable speed.
    The electronic control unit 100 is signaled via a link 105 to a pressure sensor unit 110 arranged to sense ambient air pressure. The electronic control unit 100 is arranged via the link to receive a signal 110 concerning the ambient air pressure, i.e. the atmospheric pressure in connection with the system 100. from the pressure sensor unit representing ambient air pressure data The electronic control unit 100 is via a link 115 signal connected to a speed requesting unit 120 arranged to receive a request for fan speed, where the requested fan speed corresponds to The electronic control unit 100 is arranged via the link to receive a signal from 120 representing the requested speed for said calibrated ambient air pressure. the hydraulic pressure data representing the hydraulic pressure data unit The electronic control unit 100 is arranged to determine, based on said ambient air pressure data and the said hydraulic pressure data, what the actual speed of said requested fan speed entails. The electronic control unit 100 is arranged so that said determined fan speed exceeds a predetermined threshold value via signals 125 sent via a link 125 to a hydraulic pump 12 corresponding to a hydraulic pressure limitation of the speed to said threshold value.
    Fig. 4 schematically illustrates a block diagram of a method for controlling the speed of a hydraulically driven fan motor arranged for variable speed according to an embodiment of the present invention.
    According to one embodiment, the method for controlling the speed of a hydraulically driven fan motor arranged for variable speed comprises a first stage S1. In this step, the ambient atmospheric pressure is determined.
    According to one embodiment, the method for controlling the speed of a hydraulically driven fan motor arranged for variable speed comprises a second stage S2. In this step, the speed of a hydraulically driven fan motor arranged for variable speed is controlled based on ambient atmospheric pressure.
    According to one embodiment, the method for controlling the speed of a hydraulically driven fan motor arranged for variable speed comprises a third stage S3. In this step, the speed is limited to not exceeding a predetermined threshold value independent of said atmospheric pressure. Said predetermined threshold value is selected based on component performance instead of the cooling demand the fan motor is arranged to meet, whereby in a high performance fl motor no or no limitation is required even at high altitudes where the atmospheric pressure is relatively low, while in a fan motor with relatively low performance greater limitation is required at lower atmospheric pressures. Said component performance may also relate to the hydraulic pump. According to an embodiment of the method, the step comprises that altitude, i.e. determine the altitude above sea level, which means that the current atmospheric pressure and determine said atmospheric pressure to determine the current consequently air density can be obtained thereby. According to one embodiment of the method, said predetermined threshold value exceeds the speed applied at sea level.
    Above, the method and system for controlling the speed of a hydraulically driven fan motor arranged for variable speed based on ambient atmospheric pressure have been described. According to variants, in addition to control based on atmospheric pressure, the fan motor is also arranged to be controlled based on additional parameters such as air temperature, water temperature, etc.
    The above description of the preferred embodiments of the present invention has been provided for illustrative and descriptive purposes. It is not intended to be exhaustive or to limit the invention to the variations described. Obviously, many modifications and variations will occur to those skilled in the art. The embodiments have been selected and described to best explain the principles of the invention and its practical applications, thereby enabling one skilled in the art to understand the invention for various embodiments and with the various modifications appropriate to the intended use.
    权利要求:
    Claims (12)
    [1]
    A method of controlling the speed of a hydraulically driven fan motor arranged for variable speed based on ambient atmospheric pressure, comprising the step of determining said ambient atmospheric pressure, characterized by the step of limiting the speed not to exceed a predetermined threshold value independent of said atmospheric pressure.
    [2]
    A method according to claim 1, wherein said predetermined threshold value is selected based on component performance instead of the cooling need the fan motor is arranged to meet.
    [3]
    A method according to claim 1 or 2, wherein the step of determining said atmospheric pressure comprises determining the actual altitude.
    [4]
    A method according to any one of claims 1-3, wherein said predetermined threshold value exceeds the speed applied at sea level.
    [5]
    The method of claims wherein said component performance comprises 2-4, the performance of at least one of according to any of the components fan motor and hydraulic pump.
    [6]
    System for controlling the speed of a hydraulically driven fan motor arranged for variable speed based on ambient atmospheric pressure, comprising means for determining said ambient atmospheric pressure, characterized by means for limiting the speed not to exceed a predetermined threshold value independent of said atmospheric pressure.
    [7]
    The system of claim 6, wherein said predetermined threshold value is arranged to be selected based on component performance instead of the cooling demand the fan motor is arranged to meet.
    [8]
    A system according to claim 6 or 7, wherein said means for determining said atmospheric pressure comprises means for determining the actual altitude. 10 10
    [9]
    A system according to any one of claims 6-8, wherein said predetermined threshold value is arranged to exceed the speed applied at sea level.
    [10]
    A system according to any one of claims 6-9, wherein said component performance comprises the performance of at least one of the components fan motor and hydraulic pump.
    [11]
    A system according to any one of claims 6-10, wherein said fan motor is arranged to be operated by means of a hydraulic pump, which hydraulic pump is calibrated for a certain atmospheric pressure.
    [12]
    Motor vehicle comprising a system according to any one of claims 6-11.
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    同族专利:
    公开号 | 公开日
    BRPI1104807A2|2017-11-07|
    SE535725C2|2012-11-27|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2021058126A1|2019-09-25|2021-04-01|Caterpillar Sarl|Cooling fan control device, cooling device, and cooling fan control method|
    法律状态:
    2021-06-29| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1051168A|SE535725C2|2010-11-09|2010-11-09|Method and system for controlling fan speed of fan motor|SE1051168A| SE535725C2|2010-11-09|2010-11-09|Method and system for controlling fan speed of fan motor|
    BRPI1104807-7A| BRPI1104807A2|2010-11-09|2011-11-09|METHOD AND SYSTEM FOR CONTROLLING THE ROTATION SPEED OF A FAN MOTOR|
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