WO2019115143A1 - Procédé de plausibilisation dans l'alimentation électrique d'un moteur électrique - Google Patents

Procédé de plausibilisation dans l'alimentation électrique d'un moteur électrique Download PDF

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Publication number
WO2019115143A1
WO2019115143A1 PCT/EP2018/081487 EP2018081487W WO2019115143A1 WO 2019115143 A1 WO2019115143 A1 WO 2019115143A1 EP 2018081487 W EP2018081487 W EP 2018081487W WO 2019115143 A1 WO2019115143 A1 WO 2019115143A1
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WO
WIPO (PCT)
Prior art keywords
phase
current
relationship
amplitude
determined
Prior art date
Application number
PCT/EP2018/081487
Other languages
German (de)
English (en)
Inventor
Roman Nestlinger
Jovan Knezevic
Marcel Kuhn
Sebastian HUEGLER
Original Assignee
Bayerische Motoren Werke Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke Aktiengesellschaft filed Critical Bayerische Motoren Werke Aktiengesellschaft
Priority to CN201880063877.1A priority Critical patent/CN111149291A/zh
Publication of WO2019115143A1 publication Critical patent/WO2019115143A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
    • H02P29/0241—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an overvoltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/16—Measuring asymmetry of polyphase networks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • G01R19/16547—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies voltage or current in AC supplies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/005—Testing of electric installations on transport means
    • G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/343—Testing dynamo-electric machines in operation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors

Definitions

  • the present invention relates to a method for plausibility checking in the power supply of an electric motor having three phases, which are in a defined symmetry relationship to each other, wherein only two current sensors are provided, as well as an engine control method using this method, an associated control unit and a motor vehicle equipped therewith.
  • Too high a current in the neutral point can occur due to an improperly functioning or failed current sensor or a hardware defect in the e-machine inverter network (for example, winding short circuits), which affects the symmetry of the system. Such an error leads to the generation of a wrong moment on the shaft of the electric motor or drive axle of the vehicle. Such a lack of torque loyalty can lead to a dangerous loss of control of the vehicle. Therefore, the aforementioned components play a major role in functional safety.
  • the present invention has for its object to provide a method for a reliable plausibility check in a power supply of an electric motor with three phases, which are in a defined symmetry relationship to each other, but only two current sensors are provided to specify.
  • a method for plausibility checking in the power supply of an electric motor with three phases, which are in a defined symmetry relationship to each other, wherein only two current sensors are provided comprising the steps of: measuring the current in a first phase by means of a first current sensor and the current in a second phase by means of a second current sensor; Calculating the current in the third phase as a function of the measured currents taking into account the symmetry relationship; Determining the phase relationship between the first phase and the second phase; Comparing the determined phase relationship with the defined symmetry relationship; and evaluating the current in the third phase as plausible if the determined phase relationship matches the defined symmetry relationship, otherwise evaluating the current in the third phase as implausible.
  • the method comprises the following further steps: determining the amplitude of the current in the first phase by means of the first current sensor as a first amplitude and the amplitude of the current in the second phase by means of a second current sensor as a second amplitude; Comparing the first amplitude with the second amplitude; and also the step, if the first amplitude and the second amplitude are different. and the current in the third phase was considered implausible: locating in which phase the error occurred using the information on the different first and second amplitudes and on the implausible current in the third phase. In this way, it is possible not only to determine whether the power supply is plausible and thus very likely to be faultless, but to determine the location of the fault in the event of a lack of plausibility.
  • first amplitude and the second amplitude may be advantageous to regard the first amplitude and the second amplitude as equal if and only if they differ by less than a value which corresponds to the measurement accuracy of the relevant current sensors.
  • This is in conventional current sensors for the power supply of a motor vehicle about 3 to 4% of the respective amplitude of the respective currents.
  • a defined tolerance is added up and compared with the measured value of the first or second phase. Values outside the tolerance band are reported as errors.
  • a value table (often referred to as a look-up table) in which a virtual history of the current in the third phase is stored as a characteristic.
  • the current values can be made plausible with one another since they should have the same amplitude value at the time of the respective zero crossings. Due to the capabilities of the available processors, this process can be carried out "online”, ie without any delay in the process. For the implementation of this method, only a small memory is required in which the respective current values are stored at the time of the zero crossings, possibly with a few values around these zero crossings.
  • the determined values are plausibilized in an electric machine model of the electric drive power supply.
  • Such e-machine models are widely used in the art and therefore need not be explained separately here.
  • a prerequisite for the implementation of this method, however, is that the machine parameters - in particular the respective currents and phases - in reality can be detected with sufficient accuracy and made available in the relevant control unit.
  • the aforementioned method has in common that the fault location can be narrowed down more precisely and thus the faulty phase can be determined.
  • redundancies can thus be implemented to achieve or even increase the required integrity of the system.
  • the object mentioned at the outset is also achieved by a motor control method using the aforementioned plausibility check method with subsequent initiation of a function ensuring the safety of the motor in the case of a negative plausibility check result; by a control unit for the plausibility check in the power supply of an electric drive with three phases, which are in a defined symmetry relationship to each other, using Use of the aforementioned plausibility check method and a corresponding analysis unit; and by a vehicle equipped with it. Accordingly, the same or similar advantages as those in connection with the above described, which is why reference is made to avoid repetition of the above statements in connection with the inventive method.
  • FIG. 1 shows a power supply of a three-phase electric motor with associated control unit for an electric motor of a motor vehicle, wherein a first error has occurred
  • FIGS. 2A and 2B show a current and phase diagram for the power supply of FIG. 1 before and after the occurrence of the first fault
  • FIG. 3 is a flowchart showing a plausibility check method according to the invention.
  • Fig. 4 is a power supply of a three-phase electric motor with associated control unit for an electric motor of a motor vehicle, wherein a second error has occurred, and
  • FIGS. 5A and 5B show a current and phase diagram for the power supply of FIG. 4 before and after the occurrence of the second fault.
  • a power supply 20 of an electric motor 12 with three phases u, v, w is shown schematically, which is connected via a control unit 30 to the electric motor 12.
  • This arrangement is provided as part of a likewise designated only schematically by a reference numeral 10 motor vehicle.
  • the three phases u, v, w are in a defined symmetry relationship relative to each other, for the sake of simplicity here is based on a phase separation of 120 °.
  • phase u also as third Phase referred to
  • phase v also referred to as the first phase
  • applied voltage voltage
  • U uv which between the phase v and the phase w (also referred to as the second phase) voltage applied (complex) with U vw and the voltage applied between the phase w and the phase u is designated U wu , as indicated by respective arrows.
  • the current I 2 in the first phase v flowing through an impedance Z 2 is measured by a first current sensor 21, while the current I 3 flowing through an impedance L * in the second phase w is measured by a current sensor 22.
  • the third phase u is no
  • the control unit 30 receives the data from the power supply 20 and processes it in an analysis unit 40. As shown in Fig. 1, the two current sensors 21 and 22 are part of the power supply 20, but they may also be part of the control unit 30.
  • Fig. 1 is indicated by a double arrow at the impedance symbolizes an occurring error, after which the impedance value is reduced to a factor k. This error occurs, for example, in an internal fault in a coil, in which the system as a whole, however, is intact.
  • This error occurs, for example, in an internal fault in a coil, in which the system as a whole, however, is intact.
  • FIG. 2A shows how the respective currents and phase relationships between the individual phases u, v, w change after the occurrence of the error at a time of 0.02 s by a halving of the impedance. While the currents I 2 and I 3 in the first phase v and second phase w have become larger by about 1/6, the current y in the third phase u has become larger by about half. However, the sum current I ⁇ from these three currents has remained constant. As can be seen from Fig. 2B, the phase difference ⁇ v - ⁇ v has decreased from 120 ° to 100 °.
  • Fig. 3 it is shown how to proceed concretely in the inventive method for plausibility of the power supply.
  • the current I v and the current I w are measured by means of the current sensors 21 and 22, respectively.
  • the current I u is calculated as a function of the currents I v , I w measured in step S 100.
  • the phase relationship between the first phase v and the second phase w is determined and, in a step S 106, this phase relationship is compared with the symmetry relationship defined by the design of the power supply.
  • a case distinction is made as to whether the phase relationship coincides with the symmetry relation. If this is the case ("YES"), it is assumed in a step S 110 that the current I u is plausible. In this case, therefore, the result of the plausibility check is that the power supply 20 of the electric motor 12 operates correctly.
  • step S112 If the phase relationship does not match the symmetry relationship ("NO" as a result of step S108), it is determined in step S112 that the current I u is implausible. Thereafter, in a step S114, the amplitude A v of the current I v and the amplitude A w of the current I w are determined. Then, in a step S116, it is checked whether the amplitude A v is equal to the amplitude A w or at most the measuring accuracy D of the respective current sensors 21, 22 differ from each other (which typically 3-4% of the respective
  • Amplitude is). If this is not the case, it is located in a step S118, in which phase the error has occurred. This localization is performed using the information about the different first amplitude A v and second amplitude A w and about the implausible current I u in the third phase u.
  • a suitable measure or function can be initiated in order to ensure the safety of the engine or engine To ensure that equipped motor vehicle.
  • Fig. 4 is symbolized by a double arrow at the impedance in the phase u another, second, occurring error, as occurs, for example, in a short circuit with current drain and the current drain occurs by a Masseabgriff.
  • this impedance is divided into the two impedances Z 12 and Z 11 .
  • the (complex) voltage dropping across the impedance Z 12 is denoted by U u
  • the (complex) voltage between the phase v and the phase u is denoted by U v
  • the (complex) voltage applied between the phase w and the phase u ) Voltage bears the name U w , as shown by respective arrows.
  • the current I2 in the first phase v flowing through an impedance Z 2 is measured by a first current sensor 21, while the current y flowing through an impedance Z 3 in the second phase w is measured by a current sensor 22.
  • the third phase u is no
  • FIG. 5A shows how the respective currents and phase relationships between the individual phases u, v, w change after the occurrence of the error at a time of 0.02 s due to the short circuit. While the currents I 2 and I 3 have become smaller in the first phase v and second phase w by about 1/6, the current I 1 in the third phase u has become about twice as large. The sum current Ig from these three streams has increased by about half. As can be seen from Fig. 5B, the phase difference ⁇ v - ⁇ w has decreased from 120 ° to 100 °.
  • the plausibility check method is similar to that described above.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electric Motors In General (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

L'invention concerne un procédé de plausibilisation dans l'alimentation électrique (20) d'un moteur électrique (12) pourvu de trois phases (u, v, w) qui se trouvent dans une relation de symétrie définie les unes par rapport aux autres, seuls deux capteurs de courant (21, 22) étant présents, et ses étapes consistent : à mesurer le courant (Iv) dans une première phase (v) au moyen d'un premier capteur de courant (21) et le courant (Iw) dans une deuxième phase (w) au moyen d'un deuxième capteur de courant (22) ; à calculer le courant (Iu) dans la troisième phase (u) en fonction des courants (Iv, Iw) mesurés en prenant en compte la relation de symétrie ; à calculer la relation de phase entre la première phase (v) et la deuxième phase (w) ; à comparer la relation de phase calculée à la relation de symétrie définie ; et à évaluer le courant (Iu) dans la troisième phase (u) comme étant plausible dans le cas où la relation de phase calculée coïncide avec la relation de symétrie définie, et dans le cas contraire à évaluer le courant (Iu) dans la troisième phase (u) comme n'étant pas plausible.
PCT/EP2018/081487 2017-12-11 2018-11-16 Procédé de plausibilisation dans l'alimentation électrique d'un moteur électrique WO2019115143A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201880063877.1A CN111149291A (zh) 2017-12-11 2018-11-16 用于在电动机的供电装置中可信度检验的方法

Applications Claiming Priority (2)

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DE102017222420.7 2017-12-11
DE102017222420.7A DE102017222420A1 (de) 2017-12-11 2017-12-11 Verfahren zur plausibilisierung bei der stromversorgung eines elektrischen motors

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WO2019115143A1 true WO2019115143A1 (fr) 2019-06-20

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DE102019211887A1 (de) * 2019-08-08 2021-02-11 Rolls-Royce Deutschland Ltd & Co Kg Betriebsverfahren für ein rekuperationsfähiges elektrisches Antriebssystem
BE1027539B1 (de) * 2019-09-02 2021-03-29 Phoenix Contact Gmbh & Co Verfahren und Vorrichtung zur Ermittlung der Drehrichtung eines Drehfeldes sowie Hybrid-Motorstarter
CN112068030B (zh) * 2020-09-27 2021-05-28 安徽江淮汽车集团股份有限公司 一种接地***的故障检测方法、设备、存储介质及装置

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Publication number Publication date
DE102017222420A1 (de) 2019-06-13
CN111149291A (zh) 2020-05-12

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