• 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 a device for detecting (D) a continuous electrical isolation break between a high-voltage cable (10a, 10b) and an electrical ground (C), the high-voltage cable being connected on one side to a high-voltage direct current generator (10) and on the other side a device for using (20) said high voltage, and generating a parasitic capacitance Cp with the electrical ground. According to the invention, said detection device (D) comprises: at least one electrode (40a, 40b) located at a distance (e, d) from the high-voltage cable, forming an additional capacitor Ca with said high-voltage cable and electrically connected to measuring means (30) of a measured capacitance Cm between said electrode and the electrical ground (C) connected to, • comparison means (50) between the value of this measured capacitance and a pre-stored threshold value (Cth), connected to, • means for generating (70) an alert message if the value of the measured capacitance is greater than the threshold value, signifying the electrical isolation break of said cable high voltage, • the value of the measured capacitance Cm being equal to:
    公开号:FR3015040A1
    申请号:FR1362669
    申请日:2013-12-16
    公开日:2015-06-19
    发明作者:Cyril Robin；Eric Servel
    申请人:Continental Automotive GmbH；Continental Automotive France SAS；
    IPC主号:
    专利说明:

    [0001] The invention relates to a device for continuously detecting electrical insulation failure of a high-voltage cable and an associated detection method. The term electrical isolation break means the connection to the electrical ground of the high-voltage cable.
    [0002] The invention is more particularly applicable to electric or hybrid motor vehicles comprising a high-voltage direct current source, for example an 80 V electric battery. For such high continuous voltages, the battery is not connected to ground. vehicle, that is to say to its chassis, as is usually the case for 12 V low-voltage batteries. The battery and the two high-voltage cables, one for the positive pole and one for the negative pole, the electrically connecting the rest of the electrical system / hybrid embedded in the vehicle are kept electrically isolated from the electrical mass of the vehicle, that is to say the vehicle chassis, for reasons of electrical safety. The phenomenon of electrical insulation failure can cause serious consequences for the user of the vehicle. Indeed, if at least one of the high-voltage cables is not isolated from the electrical earth (that is to say the chassis), the driver or the operator, during maintenance operations of the vehicle, can come into contact with both the chassis (by means of his hand resting on the bodywork for example) and the high-voltage cable. It incurs the risk of being seriously injured, given the high values of continuous voltage applied. In addition, the connection to the electrical ground (through the chassis of the vehicle) of one of the high voltage cables can promote a start of fire at the vehicle. It will be understood that it is therefore necessary to constantly check the electrical insulation of these two high voltage cables coming from the battery. This need is detailed in the SAE InternationalTM ("Society of Automotive Engineers") standard J2344 "Guidelines for Electric Vehicle Safety" of March 2010. One of the solutions of the prior art consists of measuring the voltage across a resistor connected on one side to the high-voltage cable whose electrical isolation is to be verified and on the other to the vehicle chassis. However, to carry out this measurement, it is necessary to electrically connect the high voltage cable to the frame and thus potentially compromise the electrical insulation of said cable. This measurement is therefore to be carried out preferentially discontinuously, for example at a fixed frequency using a switch placed between the resistor and the chassis. However, there is still a risk of electrical isolation breaking of the high voltage cable occurring between two successive measurements. For this purpose, the invention proposes a device for detecting the electrical insulation breaking of the high-voltage cable making it possible to check the electrical insulation of said cable in a continuous and non-intrusive manner, while not compromising the electrical isolation of said cable. . The invention proposes a device for continuously detecting an electrical insulation break between a high-voltage cable and an electrical ground, the high-voltage cable being connected on one side to a DC high-voltage current generator and to the another side to a device for using said high DC voltage, and generating parasitic capacitance with the electrical mass. According to the invention said detection device comprises: at least one electrode located at a distance from the high-voltage cable, forming an additional capacitance with said high-voltage cable, means for measuring a measured capacitance, between said electrode and the electrical ground, means for comparing the value of the measured capacitance with a pre-stored threshold value, means for generating an alert message if the value of the measured capacitance is greater than the value. threshold, signifying the electrical isolation break of said high-voltage cable, - the value of the measured capacitance being equal to: Cm = Ca x Cp Ca + Cp With: 25 Cm: measured capacity (pF) Ca: additional capacity (pF) Cp: parasitic capacitance (pF) Thus, judiciously, the parasitic capacitance Cp is measured indirectly and continuously by the addition of an electrode positioned in such a way that it creates an additional capacitor Ca with high voltage battery. Since the additional capacitance Ca has a fixed and known value, by measuring the capacitance Cm at the terminals of this electrode, the parasitic capacitance Cp is indirectly measured between the high-voltage cable and the electrical ground. Any variation in the measured capacitance Cm is representative of a variation of the parasitic capacitance Cp. If the parasitic capacitance Cp, and thus the measured capacitance Cm, exceeds a threshold, then an electrical isolation break of said cable is detected.
    [0003] In a second embodiment, the continuous detection device further comprises: a reference electrode located at a distance from the high-voltage cable, forming a reference capacitance with said high-voltage cable and connected to the electrical ground; value of the measured capacitance being equal to: Cm '= Ca x Ceq Ca + Ceq With: Ceq = Cref + Cp Cm': measured capacity (pF) Ceq: equivalent capacity (pF) Cref: reference capacity (pF) Ca: additional capacity (pF). Preferably, the additional capacity is at least ten times greater than the parasitic capacitance or according to the second embodiment the reference capacitance is at least ten times greater than the parasitic capacitance, and the additional capacitance is at least two times greater than the parasitic capacitance, and the additional capacitance is at least two times greater than the parasitic capacitance; reference capacity. The electrode may consist of a planar electrode located opposite the high-voltage cable or a cylindrical electrode of conducting material surrounding the high-voltage cable. Similarly, the reference electrode may consist of a flat electrode located opposite the high-voltage cable or a cylindrical electrode made of conducting material surrounding the high-voltage cable. The means for generating an alert message are preferably visual or audible means signaling the electrical isolation break. The invention also relates to a method for continuously detecting an electrical insulation break between a high voltage cable and an electrical mass using the continuous detection device according to the characteristics listed above, said detection method comprising the following steps: Step a: storage by the comparison means of a threshold value of the measured capacitance; step b: measurement by the measuring means of the measured capacitance; and step c: comparison by the means of comparison between the value of the measured value. the measured capacitance and the pre-stored threshold value, - Step d: if the value of the measured capacitance is greater than the threshold value then generation of an alert message by the means of generating an alert message, Otherwise, - Step e: if the value of the measured capacitance is lower than the threshold value, then repeating steps b, c, d. In the first embodiment, the method further comprises a preliminary phase for determining a maximum value of the parasitic capacitance and in step a, the threshold value is equal to the maximum value of the parasitic capacitance.
    [0004] In the second embodiment, the threshold value is equal to: Cth '= A x Cref With: Cth': threshold value Cref: the value of the reference capacity (pF) and A: safety coefficient The invention also relates to all motor vehicle comprising the continuous detection device according to any one of the features listed above. Other objects, features and advantages of the invention will become apparent on reading the following description given by way of nonlimiting example and on examining the appended drawings in which: FIG. 1 schematically represents a first embodiment of FIG. According to the invention, FIG. 2a diagrammatically shows in detail the flat electrode 40a according to a first variant of the first embodiment of the detection device D. FIG. 2b diagrammatically shows in detail the cylindrical electrode 40b according to a second variant of the first embodiment of the detection device D. FIG. 3 schematically represents a second embodiment of the detection device D 'according to the invention. FIG. 4a diagrammatically shows in detail the flat electrode 40a. and the plane reference electrode 41a according to a first variant of the second embodiment of the device. 4b shows diagrammatically in detail the cylindrical electrode 40b and the cylindrical reference electrode 41b according to a second variant of the second embodiment of the detection device D '. A first embodiment of the continuous detection device D according to the invention is shown in FIG. 1. A high voltage direct current generator of the high voltage battery type has its two terminals, positive (V +) and negative (V-) connected. electrically by two high voltage cables 10a and 10b, to a device 20 for using said DC voltage, for example a DC / DC low voltage converter. The use device 20 is electrically connected to the on-board electrical or electronic system of the vehicle (not shown). The set is embedded in said vehicle.
    [0005] The high-voltage circuit consists of the battery 10 and the two high voltage cables 10a, 10b and is isolated from the chassis C of the vehicle which is connected to the electrical earth. The proximity between two high voltage cables 10a, 10b (not connected to the electrical earth) and the chassis C of the vehicle (connected in turn to the electrical earth) creates a resistance R of infinite value between each of said high voltage cables 10a, 10b and the chassis C of the vehicle. In FIG. 1, for the sake of clarity, only the resistor R is shown between the high voltage cable 10a connected to the positive terminal (V +) of the high voltage battery 10 and the chassis of the vehicle C. In addition, this resistance R of infinite value is accompanied in parallel by a parasitic capacitance Cp of low value (of a few pF) between each of the high voltage cables 10a, 10b and the frame C. This parasitic capacitance Cp is due, among other things, to the potential difference between each of the high voltage cables 10a, 10b and the chassis C. If, for example, the high voltage cable 10a connected to the positive terminal (V +) of the high voltage battery 10 is no longer electrically isolated and is electrically connected again in the chassis C, the resistance R between the two will drop considerably to take a value equal to the resistance of the connection between the high voltage cable 10a and the chassis C of the vehicle. The parasitic capacitance Cp, in turn, is short-circuited by this low value resistor. The invention proposes to continuously measure the value of the parasitic capacitance Cp between at least one of the high voltage cables 10a, 10b and the chassis C (ie the electric mass of the vehicle) in order to detect any breakage. electrical isolation of said high voltage cable 10a, 10b. For this purpose, the invention proposes to add an electrode 40a (see FIG. 2a) near the high voltage cable 10a whose electrical isolation is to be verified, as well as measurement means 30 connected to the chassis C (ground electrical)) and measuring a measured capacitance Cm existing between said electrode 40a and the frame C. The presence of the electrode 40a near the high voltage cable 10a creates an additional capacitance Ca between the electrode 40a and said cable. The additional capacitor Ca is in fact composed of two electrodes, the electrode 40a and the electrode formed by the cable. Given the presence of the parasitic capacitance Cp between the high voltage cable 10a and the chassis C, the measuring means 30 do not measure only the value of the additional capacitor Ca but measure a measured capacitance Cm equivalent to the two capacitors connected in series. , namely the additional capacity Ca and the parasitic capacitance Cp (see FIG. The measured capacitance Cm is therefore equivalent to: Ca x Cp Cm = [equation 1] Ca + Cp 10 Since the value of the additional capacitance Ca is fixed and known, the variation in the value of the measured capacitance Cm is therefore representative of the variation of the value of parasitic capacitance Cp. Indeed, according to equation 1, any variation in the value of parasitic capacitance Cp causes a variation in the value of the measured capacitance Cm. The continuous detection device D according to the invention thus enables the value of the parasitic capacitance Cp to be measured indirectly by measuring the measured capacitance Cm. By judiciously choosing the value of the additional capacitance Ca, much greater than the value of the parasitic capacitance Cp, for example at least ten times greater than that of the parasitic capacitance Cp, according to equation [1]: Thus, the value of the measured capacitance Cm, when the high-voltage cable 10a is isolated from the chassis C (that is to say from the electrical ground) is therefore substantially equal to the value of the parasitic capacitance Cp. During an electrical insulation break of the high-voltage cable 10a, that is to say when the latter is connected to the electrical ground of the chassis C, the parasitic capacitance Cp disappears as it is short-circuited by the resistor. R of the connection of the high-voltage cable 10a to the chassis C. In this case, there is only one capacitance between the high-voltage cable 10a which is equal to the additional capacitance Ca. When the parasitized capacitance Cp is short circuit, then: Cm Ca Of course, there may be several intermediate cases of electrical insulation failure, depending on the intensity of the leakage current between the high voltage cable 10a and the chassis C. The measured capacity value Cm Thus, the value of the parasitic capacitance Cp (no electrical insulation break) varies from a value equal to the value of the additional capacitor Ca (in the event of a break in electrical insulation).
    [0006] To detect all cases of electrical insulation failure, the invention proposes a preliminary step of measuring a maximum value of parasitic capacitance Cpmax. This preliminary step is carried out on several vehicles. For example, a capacimeter is electrically connected between the high-voltage cable 10a and the chassis C of the vehicle and then the value which is equal to the value of the parasitic capacitance Cp is measured (in the case where there is no electrical insulation breakage of said cable). This is repeated for each vehicle. The maximum value Cpmax of the parasitic capacitance values measured in this way makes it possible to define a threshold value Cth of the measured capacitance Cm and hence: Cth, k, Cpmax. The passage above this threshold Cth then signifies the insulation break. between the high voltage cable 10a and the electrical chassis, that is to say the chassis C. In order to distinguish these two cases (electrical isolation break or not), it is recommended to size the value of the capacitance additional Ca, much larger than the value of the maximum parasitic capacitance Cpmax. For example: Ca = 10 X Cpmax Thus, the value of the measured capacitance Cm varies between the value of the maximum parasitic capacitance Cpmax and ten times the value of said maximum parasitic capacitance (since Ca = 10 × Cpmax), which allows to quickly detect a case of electrical insulation failure. The measuring means 30, measuring the variation of the measured capacitance Cm, are known to those skilled in the art, and consist, for example, of a device for measuring the variation of a charge transfer capacitance, or any equivalent device, as described in patent FR 2 938 344 B1, for example. Comparison means 50, connected to the measuring means 30, then compare the value of the measured capacitance Cm with the threshold value Cth which has been previously stored in the comparison means 50. The comparison means 50 are, for example, software means integrated into a microprocessor. If the value of the measured capacitance Cm is greater than the threshold value Cth, then generation means 70 trigger an alert message, for example visual 35 or sound (to the user / driver of the vehicle) signifying the break electrical insulation of the high voltage cable 10a, that is to say indirectly the electrical insulation break of the high voltage battery 10 of the vehicle.
    [0007] The additional capacitance Ca consists of two electrodes: a first electrode, for example a plane electrode 40a (see FIG. 2a) made of conductive material, located at a distance e from the high voltage cable 10a, and positioned opposite it. , for example a copper foil of a few square centimeters of surface S, and - a second electrode constituted by said cable 10a itself. This flat electrode 40a is not connected to the high-voltage cable 10a (or 10b) and is electrically connected to the measuring means 30 of the measured capacitance Cm between said electrode 40a and the chassis C.
    [0008] In the case of a plane electrode 40a, made of a copper foil located at a distance e = 1 mm from the cable, the surface S of the copper foil is equal to: Ca xe S = E, XEr with: 1 Co: the dielectric constant of the vacuum equal to 36X nx 109 'Er: the dielectric constant of the insulation surrounding the cable 10a, for example equal to 3 for a plastic material, Ca: additional capacity. For a maximum value of the parasitic capacitance Cpmax equal to 1 pF, if an additional capacitance Ca equal to 10 pF is desired (in the case where Ca = 10 x Cpmax), then the surface S must be equal to 4 cm 2 . A copper foil of 4 cm 2 is therefore sufficient to create an additional capacitance Ca of the order of 10 pF. The electrode may also take the form of a cylindrical electrode 40b in the form of a copper ring partially or totally surrounding the insulating jacket of the high-voltage cable 10a (see FIG. 2b). In this case, the length I of the cylindrical electrode 40b is given by the formula: 1 Ca x 1nR1f2 = 2XTEXE0XEr with: R1: Radius of the high-voltage cable, R2: Internal radius of the cylindrical electrode 40b, 1 Co: the dielectric constant of the vacuum equal to 36 × n × 109 × Er: the dielectric constant of the insulation surrounding the cable 10 a, for example equal to 3 for a plastic material, n = 3.14 Ca: additional capacity. For example, if: R1 = 0.015 m R2 = 0.016 m We define d = R2 - R1 = 0.001 m If we want to obtain an additional capacity Ca = 10 pF then the length of the cylindrical electrode is equal to: I = 0.010 m It is important to position the flat electrode 40a, or the cylindrical electrode 40b at a certain distance (e, d) from the high voltage cable 10a to isolate it from potential discharges from the high voltage cable 10a, may occur during overvoltages in said cable. These discharges could damage the electrode 40a, 40b. For example, the distance e between the flat electrode 40a and the insulating jacket of the high-voltage cable 10a or between the inner radius R2 of the cylindrical electrode 40b and the radius R1 of the high-voltage cable 10a, ie d = R2-R1 , is preferably of the order of 1 mm. As previously indicated, the value of parasitic capacitance Cp can vary from one vehicle to another. This can lead to cases of non-detection of insulation failure on certain vehicles having a parasitic capacitance Cp lower than the maximum value of the parasitic capacitance Cpmax established. To remedy this drawback, the invention proposes a second embodiment of the continuous detection device D 'shown in FIG. 3. In this second embodiment, the continuous detection device D' also comprises an electrode 41a, 41b, located at a distance e ', d' (see Figures 4a, 4b) of the high voltage cable 10a and electrically connected to the chassis C of the vehicle. This reference electrode, like the electrode 40a, 40b, may be a flat reference electrode 41a (positioned facing the high-voltage cable), or a cylindrical reference electrode 41b (surrounding the high-voltage cable). This reference electrode (41a, 41b) creates a reference capacitance Cref between the high voltage cable 10a, and the frame C. The plane reference electrode 41a is located at a distance e 'from the cable envelope. voltage 10a. Preferably, e '= 1 mm. The cylindrical electrode 41b has an inner radius R2 ', such that the distance between the inner radius R2' of said electrode and the radius R1 of the high-voltage cable 10a, that is, = R2 '- R1 is preferably order of 1 mm. Similarly, the surface S 'of the plane reference electrode 41a is given by: S' = Cref xe 'E0 X Er with: Co: the dielectric constant of the vacuum equal to 36 xx 109 Er: the dielectric constant of the insulation surrounding the cable 10a, for example 3 equal to 3 for a plastic material, e ': distance between the flat electrode 41a and the insulating jacket of the high-voltage cable 10a, Cref: reference capacitor (pF). In the case of a cylindrical reference electrode 41b, the length l 'of said electrode 41b is given by: Cref x ln-R2' = R1 2XTEXE0XEr R1: Radius of the high-voltage cable, R2 ': Internal radius of the cylindrical electrode 41b, Co: the vacuum dielectric constant equal to 36 × 109 Er: the dielectric constant of the insulation surrounding the cable 10a, for example equal to 3 for a plastic material, Cref: reference capacity, n = 3 14. In this second embodiment, the parasitic capacitance Cp and the reference capacitance Cref, both connected to the cable and ground, are connected in parallel. Therefore, an equivalent capacitance Ceq is defined by: Ceq = Cref + Cp By judiciously choosing the reference capacitance Cref with a value clearly greater than the parasitic capacitance Cp, for example at least ten times greater than the parasitic capacitance Cp, then the value of the parasitic capacitance Cp can be neglected in front of the value of the reference capacitance Cref and Ceq = Cref And consequently, the measured capacitance Cm 'is equal to: Cm' = Ca x Ceq Ca + Ceq 30 and the value of the measured capacitance Cm 'becomes: Cm' = Ca x Cref Ca + Cref The value of the reference capacitance Cref is chosen judiciously substantially lower than the value of the additional capacitor Ca, for example at least two times lower. In this second embodiment of the invention, therefore, it is preferentially: Ca »Cref» Cp For example, Cp = 1 pF, Cref = 10 pF and Ca = 50 pF. The Cref reference capacity is at least 10 times greater than the parasitic capacitance Cp, and the additional capacity Ca is at least 2 times greater than the Cref reference capacity.
    [0009] Thus, when there is no break in the electrical insulation of the high-voltage cable 10a, then: Crd = Ceq = Cref Therefore, the threshold value of the capacitance Cth 'is equal to the value of the reference capacitor Cref .
    [0010] The threshold value of the capacitance is defined: Cth '= A x Cref with - A: safety coefficient, and the value of A included, for example, between 1 and 2. If the value of the measured capacitance Cm' is greater than the threshold value Cth ', ie Cm'> Cth ', then there is a break in the electrical insulation of the high-voltage cable 10a. The invention also relates to a method of continuously detecting an electrical insulation break between a high-voltage cable 10a and the electrical earth, in our example, the chassis C of the vehicle, comprising the following steps: Step a: storage in the comparison means 50 of a threshold value Cth, Cth 'of the measured capacitance Cm, Cm'; - Step b: measurement of the measured capacitance Cm, Cm 'by the measuring means 30, - Step c: comparison by the comparison means 50 between the measured capacitance value Cm, Cm 'and the threshold value Cth, Cth', - Step d: if the measured capacitance value Cm, Cm 'is greater than the threshold value Cth, Cth 'trigger by the generation means 70 of an alert message, otherwise, - Step e: if the value of the measured capacitance Cm, Cm' is less than the threshold value Cth, Cth 'then repetition of the steps b , c, d.
    [0011] In a first embodiment of the invention, the detection method further comprises a preliminary phase for determining a maximum parasitic capacitance Cpmax, and during step a, Cth = Cpmax. In a second embodiment of the invention, a reference electrode 41a, 41b is located at a distance (e ', d') from the high voltage cable 10a and is connected to the electrical ground, creating a reference capacitance Cref whose value is fixed and known, and in step a: Cth '= A x Cref with: 10 A: coefficient of safety, and the value of A included, for example, between 1 and 2. The invention thus makes it possible to judiciously detect the electrical isolation break of a high-voltage cable connected to a high-voltage DC generator in a non-intrusive manner by using the continuous measurement of the parasitic capacitance existing between said cable and the electrical earth.
    [0012] Of course, the invention is not limited to the described embodiments and can be achieved by any equivalent means. For example the additional capacity and / or the reference capacity can be realized using capacitors or by any other means known to those skilled in the art.
    权利要求:
    Claims (10)
    [0001]
    REVENDICATIONS1. Detection device (D) continuously breaking electrical isolation between a high voltage cable (10a, 10b) and an electrical ground (C), the high voltage cable (10a, 10b) being connected on one side to a generator high-voltage direct current (10) and on the other side to a device (20) for using said high voltage, and generating a parasitic capacitance (Cp) with the electrical ground (C), said detection device (D) being characterized in that it comprises: - at least one electrode (40a, 40b) situated, at a distance (e, d) from the high voltage cable (10a, 10b), forming an additional capacitance (Ca) with said high voltage cable (10a, 10b), - measuring means (30) of a measured capacitance (Cm), between said electrode (40a, 40b) and the electrical ground (C) '- comparison means (50) ) between the value of the measured capacitance (Cm) and a pre-stored threshold value (Cth), - means for generating (70) an alert message if the value of the measured capacitance (Cm) is greater than the threshold value (Cth), signifying the electrical isolation break of said high-voltage cable (10a, 10b), the value of the measured capacitance (Cm) being equal to: Cm = Ca x Cp Ca + Cp with: Cm: measured capacity Ca: additional capacity Cp: parasitic capacity
    [0002]
    2. Detection device (D ') according to the preceding claim characterized in that it further comprises: - a reference electrode (41a, 41b) located at a distance (e', d ') from the high voltage cable (10a , 10b) forming a reference capacitance (Cref) with said high-voltage cable (10a, 10b) and connected to the electrical ground (C), the measured capacitance value (Cm ') being equal to: Cm' = Ca x Ceq Ca + Ceq with: Cm ': measured capacity Ceq: equivalent capacity equal to: Ceq = Cref + Cp Cref: reference capacity Ca: additional capacity.
    [0003]
    3. Detection device (D, D ') according to claim 1 or 2, characterized in that the additional capacity (Ca) is at least ten times greater than the parasitic capacitance (Cp).
    [0004]
    4. Detection device (D ') according to claim 2, characterized in that the reference capacity (Cref) is at least ten times greater than the parasitic capacitance (Cp), and the additional capacitance (Ca) is at least two times greater than the reference capacity (Cref).
    [0005]
    5. Detection device (D, D ') according to any one of the preceding claims, characterized in that the electrode (40a, 40b) consists of a plane electrode (40a) situated opposite the high-voltage cable (10a, 10b) or a cylindrical electrode (40b) of conductive material surrounding the high voltage cable (10a, 10b).
    [0006]
    6. Detection device (D ') according to claims 2, 3 or 4 characterized in that the reference electrode (41a, 41b) consists of a planar electrode (41a) situated opposite the high-voltage cable (10a, 10b) or a cylindrical electrode (41b) of conductive material surrounding the high-voltage cable (10a, 10b).
    [0007]
    7. A method of continuously detecting an electrical insulation break between a high-voltage cable (10a, 10b) and an electrical ground (C) using the detection device (D, D ') according to any one of the preceding claims, characterized in that it comprises the following steps: - Step a: storage by the comparison means (50) of a threshold value (Cth, Cth ') of the measured capacity (Cm, Cm'), - Step b measurement by the measuring means (30) of the measured capacitance (Cm, Cm ') and 30 - Step c: Comparison by the comparison means (50) between the measured capacitance value (Cm, Cm') and the threshold value (Cth, Cth ') pre-stored, - Step d: if the value of the measured capacity (Cm, Cm') is greater than the threshold value (Cth, Cth ') then generation of an alert message by the generating means (70), If not, - Step e: if the value of the measured capacitance (Cm, Cm ') is lower than the threshold value (Cth, Cth') then repetition n steps b, c, d.
    [0008]
    8. Continuous detection method according to the preceding claim, characterized in that it further comprises a preliminary phase for determining a maximum value of the parasitic capacitance (Cpmax) and that during step a, the threshold value (Cth) is equal to the maximum value of parasitic capacitance (Cpmax).
    [0009]
    9. A method of continuous detection using the detection device (D ') according to claims 2 and 6, characterized in that the threshold value (Cth') is equal to: Cth '= A x Cref With: Cth': Cref threshold value: the value of the reference capacity and A: safety factor
    [0010]
    10. Motor vehicle comprising the continuous detection device (D, D ') according to any one of claims 6.
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    同族专利:
    公开号 | 公开日
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    US20150168480A1|2015-06-18|
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    法律状态:
    2015-12-21| PLFP| Fee payment|Year of fee payment: 3 |
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    2021-04-16| TP| Transmission of property|Owner name: VITESCO TECHNOLOGIES, DE Effective date: 20210309 |
    2021-12-24| PLFP| Fee payment|Year of fee payment: 9 |
    2022-02-11| CA| Change of address|Effective date: 20220103 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1362669A|FR3015040B1|2013-12-16|2013-12-16|DEVICE FOR CONTINUOUSLY DETECTING ELECTRIC ISOLATION BREAKAGE OF A HIGH VOLTAGE CABLE AND DETECTION METHOD THEREOF|FR1362669A| FR3015040B1|2013-12-16|2013-12-16|DEVICE FOR CONTINUOUSLY DETECTING ELECTRIC ISOLATION BREAKAGE OF A HIGH VOLTAGE CABLE AND DETECTION METHOD THEREOF|
    US14/559,971| US20150168480A1|2013-12-16|2014-12-04|Device for continuous detection of a break in electric insulation of a high-voltage cable and associated detection method|
    CN201410768039.8A| CN104714144B|2013-12-16|2014-12-15|The device and method of the broken string in electrical isolation for continuously detecting high-tension cable|
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