• 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:
    Summary Comfort protection control system (2) for a vehicle equipped with a comfort protection system with one or more protection loops (4), comprising a control unit (6), and a supply unit (8) adapted to apply a pulse width modulated heating signal with a period length PH and a variable pulse width P guard loop. The comfort protection control system further comprises a measuring unit (12) adapted to measure the current IH i, and the voltage UHover, the protection loop when the heating signal is applied to the protection loop and that the determining resistance of the protection loop based on the measured voltage UH and the measuring current i1, which is adapted, is applied to the control unit, the control unit being adapted to determine a parameter related to the protective loop depending on the resistance. According to one embodiment, the control system also comprises a temperature input unit (10) for input of the desired temperature for the comfort protection system, the control unit being adapted to determine a pulse width (PW) for the heating signal based on the measured resistance, the desired temperature and the determined parameter, so that the desired temperature is reached. and outputting a control signal (16) to the supply unit which is adapted to apply the heating signal to the protective loop with the determined pulse width. (Figure 2)
    公开号:SE1051302A1
    申请号:SE1051302
    申请日:2010-12-10
    公开日:2012-06-11
    发明作者:Sebastian Zamani；Henrik Persson
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    The object of the present invention is to provide an improved comfort protection control system which obviates the above-mentioned disadvantages of the current system.
    Summary of the Invention The above object is achieved by the invention defined by the independent claim.
    Preferred embodiments are defined by the dependent claims.
    According to the present invention, a comfort heating control system is provided which results in stepless and fully diagnosable electrical protection of protection loops, which generally contributes to an improved controllability of the comfort protection system. A further advantage is that it can be easily adapted to the type of protective loops used and to the length of the protective loop.
    For example, the comfort protection control system according to the invention can be used with the same performance for series resistive, parallel resistive and self-regulating (resistance increases with temperature) protection loops.
    Since the comfort heating control system indirectly determines the temperature, no temperature mains circuit is required.
    According to the invention, the heating coils are supplied with a pulse width modulated (PWM) heating signal.
    By measuring the current flowing through the heating coils, and since there is a known relationship between the current through the heating coil (made eg in copper) and the temperature, this is used, according to a first embodiment, in the temperature control.
    By measuring the current flowing through the heating coils, the resistance can be easily calculated, and since there is a known relationship between the resistance in the heating coil (made eg in copper) and the temperature, this is used, according to a second embodiment, in temperature control.
    The comfort heating control system according to the invention has the following advantages: The same type of heating cable (W / m) can be used (only the length is adjusted). 0 Handles all different types of protective cables. 10 15 20 25 30 3 0 The number of protective cables can be minimized as the control unit can handle different lengths. 0 Stepless accurate Heat control. 0 Increased diagnostic possibilities. 0 The technology can be used in all areas where heating cable is used.
    Brief Description of the Drawings Figure 1 shows a schematic block diagram of the comfort goods control system according to a first embodiment of the present invention.
    Figure 2 shows a schematic block diagram of the comfort protection control system according to a second embodiment of the present invention.
    Figure 3 shows graphs illustrating the heating signal according to the present invention.
    Figures 4 and 5 show schematic circuit diagrams of different protective loops.
    DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION With reference to the accompanying drawings, the invention will now be described in detail, with reference first to Figures 1 or 2.
    The present invention comprises a comfort protection control system 2 for a vehicle provided with a comfort heating system with one or more protection loops 4.
    Comfort protection control system 2 comprises a control unit 6 and a supply unit 8 adapted to apply a pulse width modulated heating signal with a period length PH and a variable pulse width PW to the protection loop. A graph of how the voltage with respect to the time of the heating signal varies is shown at the top of Figure 3. The pulse width PW and the period length PH, and a corresponding frequency FH, have been indicated for the first pulse. In the illustrated example, the duty cycle is approx. 50%, i.e. the pulse width is about half the period length. The duty cycle can be between 0-100% of the period length.
    At the bottom of Figure 3, a graph is shown of how the current varies with respect to the time of the warm-up signal. There, a dashed line indicating the average current IRMS has also been drawn. In this case it is at the level of half the amplitude of the pulses because the duty cycle is approx. 50%. The temperature of the heating coil depends directly on the current of the average current.
    The frequency FH of the heating signal is preferably in the range 0.1 - 100 Hz.
    However, the invention as defined in claim 1 is not limited to these ranges but other values for the frequency and pulse width are possible if a particular application requires it.
    With reference to Figure 1, the comfort protection control system according to a first embodiment of the invention will now be described. The comfort protection control system further comprises a measuring unit 12 adapted to measure the current IH in the protection loop when the heating signal is applied to the protection loop and to generate a current signal 14 depending on the measured current IH and which is adapted to be applied to the control unit. The control unit is adapted to determine a parameter related to the heating cable depending on the current.
    With reference to Figure 2, the comfort protection control system according to a second embodiment of according to the invention will now be described. The measuring unit 12 is further, in addition to measuring the current IH, adapted to measure the voltage UH across the protection loop when the heating signal is applied to the heating loop and to determine the resistance of the protection loop based on the measured voltage UH and the measured current IH, and to generate a resistance signal 14 " which is adapted to be applied to the control unit.
    The control unit is adapted to determine a parameter related to the protection cable depending on the resistance.
    According to one embodiment, the current, according to the first embodiment, or the current and voltage, according to the second embodiment, is measured during a measurement period comprising at least one pulse of the heating signal, which is advantageous because one can directly calculate the resistance and thereby determine the parameter.
    Of course, one can perform measurements on a number of pulses of the warm-up signal and calculate an average value for voltage and current, respectively, and then calculate the resistance based on these average values. According to one embodiment, the parameter represents the length of the heating loop. That is, by measuring the resistance, the length of the protective loop can be determined.
    According to another embodiment, the parameter represents the type of wire loop, which can be, for example, series resistive, parallel resistive or self-regulating.
    The determined values for the parameters, for example the length of the protective loop, are stored in the measuring unit in a memory unit (not shown in Figure 1 or 2) and can be used in later calculations.
    The measurements made to determine the current or resistance of the protective loop can preferably be made regularly to be able to identify any changes in the protective loop, for example caused by damage. Therefore, the control unit is adapted to determine the parameter related to the heating loop with a predetermined and adjustable first measuring interval between consecutive measurements. This first measurement interval can be in the order of seconds, minutes, days or weeks depending on the application in question.
    According to a preferred embodiment, the comfort heat control system 2 comprises a temperature input unit 10 for inputting the desired temperature for the comfort protection system. This has been indicated as a dashed box in Figures 1 and 2.
    A user indicates, for example via a knob or lever, the desired temperature, for example for heating the seat. It can either be in the form of a desired degree, e.g. 25 degrees, or according to a scale graded for example from 0 to 10, where 0 is no heating and 10 is maximum heating.
    The control unit is then adapted to determine a pulse width (PW) for the heating signal based on the measured resistance, the desired temperature and the determined parameter, so that the desired temperature is reached, and to provide a control signal to the supply unit adapted to apply the heating signal to the heating loop with the determined pulse width. According to a further embodiment, the control unit is adapted to determine the pulse width (PW) of the warm-up signal with a predetermined and adjustable second measuring interval between consecutive measurements. This second measuring interval depends on the previously mentioned first measuring interval, since a precondition for being able to determine the pulse width is that a current measurement and / or resistance measurement has taken place, ie. the second measuring range cannot be shorter than the first measuring range.
    If you want to achieve a quick temperature control, the current measurement / resistance measurement should take place relatively often, for example with a measurement interval of the order of a number of seconds.
    According to the present invention, the controllability of the comfort heating system is improved by current measurement and power control, and the possibility is expanded to handle different types of protective cables and protective cable lengths with the same control technology.
    A series resistive and parallel resistive heating coil can be electrically described according to the diagram shown in Figure 4.
    A self-regulating protective loop can be electrically described according to the diagram shown in figure 5.
    Since the inductance is often low in these applications, and the time constants for the power control are relatively large, we can assume that the inductance is negligible and the relationships for voltage, current and resistance can therefore be stated as U 2 R * I which is also shown in Figures 4 and 5. The fi gears show symbols for the resistances R and the inductances L for the heating coils and how these depend on the length in meters (rn).
    If we measure the current, im, through the circuit in the control unit, we can use Ohm's law (the voltage is known in the control unit) to calculate the total resistance of the protective loop. On a series and parallel resistive heating coil, the total resistance is proportional to the length, which means that we can determine the length of the heating cable. Since we know exactly which heating loop we have, we can set the desired period length PW (duty cycle), to obtain the correct current iRMS, and the corresponding temperature, as these are proportional (open regulation takes place). 10 15 20 25 30 The same principle applies to a self-regulating heating coil. The advantage of the self-regulating loop is that here you do not need to know the length but instead use the control unit to measure the temperature as the resistance is proportional to the temperature (feedback control takes place).
    The comfort heating control system according to the invention also makes it possible to diagnose problems with the protective loop, for example if the heating loop is too long or short, if temperature differences have occurred, and if there has been any short circuit to the battery or short circuit to ground.
    The resistance is thus measured by the measuring unit by measuring the current applied to the protective loop from the supply unit and is then calculated using Ohm's law (Resistance = voltage / current).
    The comfort heating control system is, according to one embodiment, used for a self-regulating protective loop, where the fact is used that the temperature affects the resistance of a material differently depending on the resistivity of the material.
    According to a preferred embodiment, the control unit activates the heating of the heating coil if the measured resistance is lower than a preset threshold. In this case, the resistance is assumed to increase with temperature and the activation thus takes place when the temperature is lower than a predetermined limit.
    The control unit is adapted to determine a temperature for the heating loop based on the measured resistance and to activate the heating of the heating loop if the determined temperature is lower than a preset threshold, e.g. 20 ° C, 22 ° C, 24 ° C, or any other suitable temperature.
    According to a further embodiment, the control system is adapted to continuously regulate the supplied energy from the supply unit in dependence on the measured resistance, or in dependence on the corresponding temperature. For example, the supply unit can be activated at a preset resistance / temperature and then continuously regulate supplied energy, by varying the pulse width, as long as the temperature is below this level.
    The electrically conductive material is preferably a metal, for example copper, or an alloy containing copper, which has a given resistance at a certain temperature. Chromium, nickel, platinum and their alloys are other materials that can be used. Of course, there are a large number of other materials which are electrically conductive and have a temperature dependent resistance which can be used in connection with the present invention.
    The resistance of the protective loop is determined for all temperatures within the working area under controlled conditions. This generates resistances and temperatures stored in a folder in a memory unit in the measuring unit or in the control unit. The resistance is determined by measuring the current supplied to the heating coil from the voltage source.
    The present invention is not limited to the above-described preferred embodiments.
    Various alternatives, modifications and equivalents can be used. The above embodiments are, therefore, not to be construed as limiting the scope of the invention as defined by the appended claims.
    权利要求:
    Claims (10)
    [1]
    A comfort heating control system (2) for a vehicle provided with a comfort protection system with one or more protection loops (4), comprising a control unit (6); a supply unit (8) adapted to apply a pulse width modulated recovery signal with a period length PH and a variable pulse width PW to said protection loop, characterized in that the comfort protection control system further comprises a measuring unit (12) adapted to measure the current IH in the heating loop when the heating signal a current signal (14) in the dependent measured current IH which is adapted to be applied to the control unit, the control unit being adapted to determine a parameter related to the protective loop in dependence on the current.
    [2]
    The comfort protection control system (2) according to claim 1, wherein said measurement of the current takes place during a measurement period comprising at least one pulse of the heating signal.
    [3]
    The comfort friend control system (2) according to claim 1 or 2, wherein the measuring unit (12) is further adapted to measure the voltage UH across the protective loop when the heating signal is applied to the heating loop and to determine the resistance of the protective loop based on the measured voltage UH and the measured current IH, and generating a resistance signal (14 °) depending thereon which is adapted to be applied to the control unit, the control unit being adapted to determine a parameter related to the protective loop in dependence on the resistance.
    [4]
    The comfort protection control system (2) according to claim 3, wherein said measurement of the voltage takes place during a measurement period comprising at least one pulse of the heating signal.
    [5]
    Comfort protection control system (2) according to any one of claims 1-4, wherein said parameter represents the length of the heating loop.
    [6]
    Comfort protection control system (2) according to any one of claims 1-4, wherein said parameter represents the type of protection loop, selected from series resistive, parallel resistive or self-regulating.
    [7]
    Comfort protection control system (2) according to any one of the preceding claims, wherein the control unit is adapted to determine said parameter related to the protection loop with a predetermined and adjustable first measuring interval between consecutive measurements.
    [8]
    Comfort protection control system (2) according to any one of the preceding claims, wherein the control system comprises a temperature input unit (10) for input of the desired temperature for the comfort heating system, the control unit being adapted to determine a pulse width (PW) for the heating signal based on the measured current and / or resistance. , the desired temperature and the determined parameter, so that the desired temperature is reached, and to supply a control signal (16) to the supply unit which is adapted to apply the heating signal to the heating loop with the determined pulse width.
    [9]
    Comfort heating control system (2) according to one of the preceding claims, wherein the heating signal has a frequency FH in the range 0.1 - 100 Hz.
    [10]
    Comfort protection control system (2) according to one of the preceding claims, wherein the control unit is adapted to determine the pulse width (PW) of the heating signal with a predetermined and adjustable second measuring interval between consecutive measurements.
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    同族专利:
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    WO2012078097A1|2012-06-14|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2004108446A2|2003-06-02|2004-12-16|Carter Group, Inc.|Temperature comfort device heater controller method and system|
    US6943327B2|2004-02-04|2005-09-13|Lear Corporation|Method for the progressive control of heating elements|
    KR100659187B1|2006-01-26|2006-12-20|길종진|Safe temperature controller|
    KR100894008B1|2007-11-16|2009-04-17|모딘코리아 유한회사|Apparatus and method for additional electrical heating device of vehicles|DE102012016029A1|2012-08-13|2014-02-13|Audi Ag|Motor car has seat-side arranged coil which is controlled by control device of vehicle seat heating device to produce magnetic alternating field, such that energy is inductively transmitted to heating medium|
    DE102013109731A1|2013-09-05|2015-03-05|Leifheit Ag|Electric heating device|
    DE102015221316B4|2015-10-30|2018-08-09|Takata AG|Electrical arrangement for a steering device of a motor vehicle and / or for a seat device of a motor vehicle and method, steering device and seat device|
    DE102017117654A1|2017-08-03|2019-02-07|SMR Patents S.à.r.l.|Method for operating a heating device, control unit and motor vehicle|
    法律状态:
    2020-07-28| NUG| Patent has lapsed|
    优先权:
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    SE1051302A|SE535512C2|2010-12-10|2010-12-10|Comfort heating control system for a vehicle equipped with comfort heating system with one or more heating loops|SE1051302A| SE535512C2|2010-12-10|2010-12-10|Comfort heating control system for a vehicle equipped with comfort heating system with one or more heating loops|
    DE201111103760| DE112011103760T5|2010-12-10|2011-12-02|Konfortwärmesteuersystem|
    PCT/SE2011/051470| WO2012078097A1|2010-12-10|2011-12-02|Comfort warming control system|
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