WO2012103993A1 - Procédé et dispositif d'étalonnage d'au moins un capteur de courant - Google Patents

Procédé et dispositif d'étalonnage d'au moins un capteur de courant Download PDF

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Publication number
WO2012103993A1
WO2012103993A1 PCT/EP2011/074147 EP2011074147W WO2012103993A1 WO 2012103993 A1 WO2012103993 A1 WO 2012103993A1 EP 2011074147 W EP2011074147 W EP 2011074147W WO 2012103993 A1 WO2012103993 A1 WO 2012103993A1
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WO
WIPO (PCT)
Prior art keywords
current
inverter
detected
current sensor
deviation
Prior art date
Application number
PCT/EP2011/074147
Other languages
German (de)
English (en)
Inventor
Julian DOERREICH
Dimitrios Stavrianos
Tankut UZAN
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2012103993A1 publication Critical patent/WO2012103993A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
    • 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
    • G01R31/40—Testing power supplies
    • G01R31/42—AC power supplies

Definitions

  • the invention relates to a method and a device for calibrating at least one current sensor, which serves for detecting a phase current of an electric machine controlled by an inverter.
  • inverter - For the drive in hybrid or electric vehicles electrical machines in the form of induction machines are usually used, which in conjunction with inverters - often referred to as inverter - are operated.
  • the electrical machines are operated either in motor or generator mode.
  • the electric machine During engine operation, the electric machine generates a drive torque, which when used in a hybrid vehicle
  • the electric machine In generator mode, the electric machine generates electrical energy that is stored in an energy storage such as a battery or a super-cab. Operating mode and power of the electrical machine are set via the inverter.
  • Known inverters comprise a series of switching elements, with which the individual phases (U, V, W) of the electric machine can be switched against a high supply voltage potential or against a low one
  • Supply voltage potential can be switched.
  • two series-connected switching elements form a half-bridge branch, wherein a first switching element with the high supply voltage potential and a second switching element with the low supply voltage potential are connected.
  • Each phase of the electric machine is then one each
  • Controlled control unit which depends on the driver's request
  • the inverter is connected to the control unit and receives from this the corresponding operating data or control commands.
  • phase currents Connecting lines between the inverter and the electric machine are arranged and detect the currents in the individual phases of the electric machine (phase currents).
  • the current sensors can scatter due to manufacturing tolerances and / or drift depending on temperature, current amount and / or aging.
  • variations (offsets) and drifts have a negative effect on the accuracy of a torque control of the electrical machine, so that a calibration of the current sensors is required.
  • the invention provides a method for calibrating at least one
  • Inverter are open or all with the high
  • Inverter are closed.
  • at least one actual value of the phase current is then detected.
  • the detected actual value or a variable derived from the at least one detected actual value is compared with a predefinable desired value and stored in
  • the invention also provides an apparatus for calibrating at least one current sensor which serves to detect a phase current of an electrical machine controlled by an inverter.
  • the device in this case comprises a control unit, which switches the electric machine into a short-circuit mode, in which all with a high
  • Inverter are open or all with the high
  • the at least one current sensor detects at least one actual value of the phase current in the short-circuit mode.
  • Device also comprises an evaluation unit, which detects the detected
  • the actual value or a variable derived from the at least one detected actual value is compared with a predefinable desired value and a deviation of the at least one current sensor from a standard state is determined as a function of a deviation of the actual value or the quantity derived therefrom.
  • phase currents set in the values of which are essentially influenced only by the electrical machine and the temperature and which are consequently known in advance.
  • the invention is based on the basic idea to use these known current values to deviations of a current sensor, which the
  • the method according to the invention and the method according to the invention offer the advantage that the calibration takes place "under load", which makes it possible for a current sensor even with different amounts of current and therefrom
  • Short-circuit mode also offers the possibility of evaluating a deviation from a standard value not only in terms of absolute value, but also taking into account the sign of the deviation.
  • phase currents oscillate around the zero point. If the detected actual values of a phase current are integrated over one or more full periods, e.g. triggered by a zero crossing of a rising edge, the current integral must be zero. The value "zero" thus represents the desired value. If a value deviating therefrom results for the current sensor to be calibrated, a measured value of the current sensor can be corrected according to the magnitude and sign of this deviation and thus the current sensor can be calibrated.
  • a summation current of the current sensors can also be used for the calibration.
  • at least one actual value of the respective phase current is detected by each current sensor in the short-circuit mode of the electrical machine.
  • the detected actual values are then summed up and the resulting summation current is compared with a predefinable setpoint value.
  • Deviation of the summation current from the setpoint the deviation of the current sensors from a standard state is then determined. Since the phase current to be detected by the current sensor in the short-circuit
  • Mode is dependent on the speed of the electric machine, it is according to According to an embodiment of the invention, in the short-circuit mode, a variable characterizing the rotational speed of the electric machine is detected and the desired value is predetermined as a function of the detected rotational speed.
  • phase current to be detected by the current sensor in the short-circuit mode is also dependent on a temperature in the region of the current sensor. Therefore, it is advantageous to detect a temperature in the region of the at least one current sensor and to specify the desired value as a function of the detected temperature.
  • the deviation of the current sensors from a standard state can also be determined at at least two different rotational speeds and / or temperatures.
  • an offset in the de-energized state of the electrical machine can additionally be determined for the at least one current sensor. If a current sensor for detecting the respective phase current is provided for each phase of the electrical machine, this can be done concretely in that at least one actual value of the respective phase current is detected by each current sensor in the de-energized state and the detected actual values are added up. In the de-energized state must in the normal state of
  • 1 is a schematic block diagram of an inverter-controlled electric machine
  • Figure 1 shows a schematic representation of a three-phase electric machine 1, which may for example be designed as a synchronous, asynchronous or reluctance machine, with a connected thereto
  • the pulse inverter 2 includes switching elements 3a-3f in the form of circuit breakers, which are connected to individual phases U, V, W of the electric machine 1 and the phases U, V, W either against a high supply voltage potential T + or switch a low supply voltage potential T-.
  • the connected to the high supply voltage potential T + switching elements 3a-3c are also called "high-side switch" and the low
  • the pulse inverter 2 further comprises a plurality of free-wheeling diodes 4a-4f, which are each arranged parallel to one of the switching elements 3a-3f
  • the switching elements 3a and 3d, 3b and 3e and 3c and 3f in each case form a half bridge 10a, 10b or 10f, which in each case one of the phases U, V , W are assigned to the electric machine 1.
  • the pulse-controlled inverter 2 determines the power and operating mode of the electric machine 1 and is controlled accordingly by a first control unit 5, which is shown only schematically and which can also be integrated in the inverter 2.
  • the electric machine 1 can be operated either in the engine or generator mode.
  • a so-called intermediate circuit capacitor 6 is arranged, which also integrates into the pulse inverter 2 may be and which essentially serves to stabilize a voltage of an energy storage, so for example a battery voltage.
  • a current sensor 7-U or 7-V or 7-W is respectively arranged, which of the detection of the phase currents l_U, l_V and l_W in the phases U and V and W of the electric machine 1 serve.
  • Output signals of the current sensors 7-U, 7-V and 7-W are supplied to the control unit 5 and taken into account in the control of the pulse inverter.
  • the electric machine 1 is designed in the illustrated embodiment, three-phase, but may also have fewer or more than three phases.
  • the current sensors 7-U, 7-V and 7-W are calibrated.
  • a first step S1 the electric machine is active in a
  • a second step S2 at least one actual value of the respective phase current l_U or, I_V or, I_W is detected by each of the current sensors 7 -U, 7-V and 7-W.
  • a variable characterizing the rotational speed of the electric machine 1 and a temperature in the region of the current sensors 7-U, 7-V and 7-W are detected.
  • a third step S3 the detected actual values are replaced by a
  • Evaluation unit 8 which may be integrated in the control unit 5 or may be implemented as a separate unit, each with a predetermined Setpoint compared.
  • the setpoints are stored in speed and temperature-dependent form in the evaluation unit 8 in the form of characteristics.
  • the deviations of the individual current sensors 7-U, 7-V and 7-W from a standard state are then determined.
  • the current sensors are thus calibrated and the deviations determined can be taken into account by the control unit 5 during the processing of the output signals of the current sensors 7-U, 7-V and 7-W, respectively.
  • actual values of the phase currents I_U, I_V and I_W can also be detected in each case over one or more periods in step S2.
  • the actual values are first integrated in step S3 for each of the phase currents I_U, I_V and I_W. Subsequently, the resulting current integrals are compared with corresponding (integral) setpoint values and the deviations of the individual current sensors 7-U, 7-V and 7-W from the standard state are determined as a function of the comparison results. Because the
  • _V and l_W oscillate around the zero point in the short-circuit mode, the current integral when integrated over one or more full periods, e.g. triggered by a zero crossing of a rising edge, giving zero.
  • the value "zero" thus represents the desired value in this case.
  • Total current of the phases are used for calibration.
  • the actual values of the individual phase currents I_U, I_V and I_W can also be added up and the total current can be compared with a corresponding (sum) desired value.
  • the setpoint values for evaluating the current integral and the total current can of course also be stored in the evaluation unit in the form of speed-dependent and temperature-dependent characteristic curves.
  • an offset of the current sensors 7-U, 7-V and 7-W can also be determined in the de-energized state of the electric machine.
  • the electric machine 1 is first switched to a freewheeling mode, in which all switches 3a-3f of the pulse-controlled inverter are open.
  • this de-energized state at least one actual value of the respective phase current I_U or I_V or I_W is detected by each of the current sensors 7-U, 7-V and 7-W.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Inverter Devices (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

L'invention concerne un procédé et un dispositif d'étalonnage d'un capteur de courant (7-U; 7-V; 7-W) qui sert à déterminer un courant de phase (l_U; l_V; l_W) d'une machine électrique (1) commandée par un onduleur (2). Selon l'invention, une unité de commande (5) met la machine électrique (1) en mode de court-circuit dans lequel au moins une valeur réelle du courant de phase (l_U; l_V; l_W) est captée par le capteur de courant (7-U; 7-V; 7-W). Une unité d'évaluation (6) compare la valeur réelle captée ou une grandeur déduite de la ou des valeurs réelles captées avec une valeur nominale pouvant être prédéterminée et, en fonction d'un écart entre la valeur réelle ou la grandeur déduite de la valeur réelle et la valeur nominale, elle détermine une déviation du ou des capteurs de courant (7-U; 7-V; 7-W) par rapport à un état normal.
PCT/EP2011/074147 2011-02-03 2011-12-28 Procédé et dispositif d'étalonnage d'au moins un capteur de courant WO2012103993A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110003566 DE102011003566A1 (de) 2011-02-03 2011-02-03 Verfahren und Vorrichtung zum Kalibrieren mindestens eines Stromsensors
DE102011003566.4 2011-02-03

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Publication Number Publication Date
WO2012103993A1 true WO2012103993A1 (fr) 2012-08-09

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PCT/EP2011/074147 WO2012103993A1 (fr) 2011-02-03 2011-12-28 Procédé et dispositif d'étalonnage d'au moins un capteur de courant

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DE (1) DE102011003566A1 (fr)
WO (1) WO2012103993A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105510867A (zh) * 2015-11-27 2016-04-20 中国南方电网有限责任公司超高压输电公司 一种基于电厂、变电站电量采集器的测试系统及方法
CN109164384A (zh) * 2018-06-28 2019-01-08 联合汽车电子有限公司 电机定子绝缘老化试验装置及试验方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012224099A1 (de) * 2012-12-20 2014-06-26 Continental Teves Ag & Co. Ohg Verfahren zum Kalibrieren eines Stromsensors
DE102013215247B4 (de) * 2013-08-02 2019-02-28 Robert Bosch Gmbh Verfahren und Vorrichtung zum Bestimmen von Strangströmen in einer Ansteuerungsschaltung
DE102017205385A1 (de) * 2017-03-30 2018-10-04 Zf Friedrichshafen Ag Verfahren zum Kalibrieren eines Umrichters für eine elektrische Maschine, Steuergerät und Steuermodul
CN110554345B (zh) * 2018-06-01 2022-04-05 联合汽车电子有限公司 一种电流传感器下线标定方法
CN109951116B (zh) * 2019-03-29 2020-12-08 华中科技大学 一种基于双电流传感器的开关磁阻电机系统及控制方法
DE102021210718A1 (de) 2021-09-27 2023-03-30 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren und Detektorvorrichtung zur Überwachung von Stromsensoren sowie elektrisches Antriebssystem

Citations (3)

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US5914582A (en) * 1997-01-27 1999-06-22 Hitachi, Ltd. Permanent magnet synchronous motor controller and electric vehicle controller
JP2007254095A (ja) * 2006-03-23 2007-10-04 Hitachi Ltd エレベータ装置
US20090284198A1 (en) * 2008-05-15 2009-11-19 Toyota Jidosha Kabushiki Kaisha Short circuit phase identification method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5914582A (en) * 1997-01-27 1999-06-22 Hitachi, Ltd. Permanent magnet synchronous motor controller and electric vehicle controller
JP2007254095A (ja) * 2006-03-23 2007-10-04 Hitachi Ltd エレベータ装置
US20090284198A1 (en) * 2008-05-15 2009-11-19 Toyota Jidosha Kabushiki Kaisha Short circuit phase identification method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105510867A (zh) * 2015-11-27 2016-04-20 中国南方电网有限责任公司超高压输电公司 一种基于电厂、变电站电量采集器的测试系统及方法
CN109164384A (zh) * 2018-06-28 2019-01-08 联合汽车电子有限公司 电机定子绝缘老化试验装置及试验方法
CN109164384B (zh) * 2018-06-28 2021-04-09 联合汽车电子有限公司 电机定子绝缘老化试验装置及试验方法

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