Method for calibrating a phase current measurement arrangement for a drive arrangement with multiple phases

Abstract

The invention relates to a method for calibrating a phase current measuring arrangement (10) for a drive arrangement (1) with multiple phases (P1, P2, P3), comprising the steps of: providing current sensors (14, 16, 18) for the phases (P1, P2, P3); detecting physical currents (i p,1 , i p,2 , i p,3 ) and providing measuring currents (i m,1 , i m,2 , i m,3 ) as linear representations of the physical currents (i p,1 , i p,2 , i p,3 ); Determining and storing current measurement sets based on the measured currents (i m,1 , i m,2 , i m,3 ), the number of which depends on a number of measurement parameters of the current sensors (14, 16, 18) to be determined, and which each measure currents (i m,1 , i m,2 , i m,3 ) of simultaneously recorded physical currents (i p,1 , i p,2 , i p,3) exhibit; setting up a system of equations to determine a measurement parameter of the current sensors (14, 16, 18); wherein an initial value for the measurement parameter is stored; wherein the initial value for the measurement parameter of a first sensor (14, 16, 18) is inserted into the system of equations; solving the system of equations using an optimization procedure taking into account a property of the drive arrangement (1) that a sum of the physical currents (i p,1 , i p,2 , i p,3 ) of all phases (P1, P2, P3) is always zero; and output and use of the measurement parameter of the individual current sensors (14, 16, 18) to determine the physical currents (i p,1 , i p,2 , i p,3 ) of the individual phases (P1, P2, P3).

Description

[0001] The invention relates to a method for calibrating a phase current measuring arrangement for a multi-phase drive arrangement. The present invention also relates to a phase current measuring arrangement for a multi-phase drive arrangement, which is designed to implement the method for calibrating a phase current measuring arrangement for a multi-phase drive arrangement, and to a drive arrangement for a vehicle comprising such a phase current measuring arrangement.

[0002] For the operation of vehicles with electric drive systems, current measuring systems are required to measure the phase currents. Calibration methods using current measuring systems are known from the prior art. These calibration methods are performed during the final vehicle inspection, a so-called "end-of-line check." A disadvantage of this approach is that the "end-of-line check" of the phase current measuring system requires complex calibration with an external measuring system to achieve the required current measurement accuracy, and the measurement characteristics are permanently stored in the memory of the phase current measuring system. Disclosure of the invention

[0003] The method for calibrating a phase current measuring arrangement for a multi-phase drive arrangement with the features of independent patent claim 1 and the phase current measuring arrangement for a multi-phase drive arrangement with the features of independent patent claim 9 each have the advantage that a dynamic, continuous calibration of the current sensors used is possible during operation of the drive in order to compensate for changes during operation and over the service life. Furthermore, the measurement accuracy of the physical currents of the individual phases can be increased. By storing the calibration values ​​over time, any drift in the continuously determined measurement parameters, such as linearity factors, can be detected. This can be used to determine the end of the service life of the individual current sensors or the circuit technology.

[0004] Embodiments of the present invention provide a method for calibrating a phase current measuring arrangement for a drive arrangement with multiple phases. The method comprises the steps of: providing current sensors for the individual phases of the drive arrangement. Detecting physical currents of the individual phases and providing measurement currents as linear images of the detected physical currents using the provided current sensors. Determining and storing current measurement sets based on the provided measurement currents of the current sensors, the number of which depends on a number of measurement parameters of the current sensors to be determined, and which each have provided measurement currents of simultaneously detected physical currents of the individual current sensors. Setting up a system of equations for determining at least one measurement parameter of the individual current sensors based on the determined and stored current measurement sets.For each of the provided current sensors, an initial value for the at least one measurement parameter is stored. For the at least one measurement parameter of at least one first sensor, the stored initial value is inserted into the system of equations. The system of equations is solved using an optimization method, taking into account a property of the drive arrangement that the sum of the physical currents of all phases of the drive arrangement is always zero. The determined at least one measurement parameter of the individual current sensors is output and used to determine the physical currents of the individual phases of the drive arrangement.

[0005] Furthermore, a phase current measuring arrangement for a drive arrangement with multiple phases is proposed, which comprises an evaluation and control unit and several current sensors for the individual phases of the drive arrangement and is designed to carry out the method according to the invention. The individual current sensors are each designed to output a measured current as a linear image of a detected physical current of a corresponding phase of the drive arrangement to the evaluation and control unit.The evaluation and control unit is designed to determine and store current measurement sets based on the measurement currents, the number of which depends on a number of measurement parameters to be determined from the current sensors of the drive arrangement, and which comprise provided measurement currents from simultaneously recorded physical currents of the individual current sensors, and to establish a system of equations based on the current measurement sets for determining at least one measurement parameter of the individual current sensors. For each of the provided current sensors, an initial value for the at least one measurement parameter is stored. The stored initial value for the at least one measurement parameter of at least one first sensor is inserted into the system of equations.In addition, the evaluation and control unit is further configured to solve the system of equations by means of an optimization method taking into account a property of the drive arrangement such that a sum of the physical currents of all phases of the drive arrangement is always zero; and to use the determined at least one measurement parameter of the individual current sensors to determine the physical currents of the individual phases of the drive arrangement.

[0006] Furthermore, a drive arrangement for a vehicle is proposed, comprising at least one multi-phase electric drive and at least one multi-phase inverter, which is designed to generate a multi-phase alternating current from an operating direct current and to output this as a physical current to the at least one multi-phase electric drive on several phases. At least one current measuring arrangement according to the invention is provided, comprising an evaluation and control unit and several current sensors. The evaluation and control unit is designed to determine and evaluate the physical currents of the phases based on the measurement currents output by the current sensors. Furthermore, the evaluation and control unit is further designed to generate control signals suitable for adjusting the physical currents of the phases for the electric drive and to output them to the at least one multi-phase inverter.

[0007] In embodiments of the present invention, the complex calibration of the phase current measuring arrangement during the "end-of-line check" with an external measuring system can advantageously be eliminated. By using inexpensive current sensors and good initial values ​​for their measurement parameters, a cost-effective implementation of a multi-phase phase current measuring arrangement with simultaneous high measurement accuracy is possible. By inserting the stored initial value of at least one measurement parameter of a first current sensor into the system of equations, the computational effort can also be reduced by reducing the number of measurement parameters to be calculated. The initial values ​​for the at least one measurement parameter of the individual current sensors can be determined, for example, using design calculations or from identical current sensors.Since the initial value for at least one measurement parameter of the first current sensor is considered known by inserting the initial value, the number of current measurement sets used to establish the DC system is one less than the number of sensors used. For example, if the drive arrangement comprises three phases, only at least two current measurement sets are used to establish the system of equations. This means that in addition to a current measurement set based on current measured current values, a stored current measurement set is also used to establish and solve the system of equations to determine at least one measurement parameter of the two current sensors with unknown measurement parameters.Preferably, in addition to a current measurement set based on current measurement current values, several stored current measurement sets are used to set up and solve the system of equations for determining at least one measurement parameter of the individual current sensors with unknown measurement parameters. The more current measurement sets are used to calculate and optimize the at least one measurement parameter of the individual current sensors with unknown measurement parameters, the better the influence of measurement noise can be suppressed. The number of current measurement sets used can, for example, be in the range of 5 to 25. Any known method, such as a method for minimizing calculated squared errors or a recursive method for minimizing calculated squared errors, can be used as the optimization method.

[0008] In this case, the evaluation and control unit can be understood to be an electrical device, such as a control unit or engine control unit, which processes or evaluates detected sensor signals. The evaluation and control unit can have at least one interface, which can be implemented in hardware and / or software. In a hardware implementation, the interfaces can, for example, be part of a so-called system ASIC, which contains a wide variety of functions of the evaluation and control unit. However, it is also possible for the interfaces to be separate integrated circuits or to consist at least partially of discrete components. In a software implementation, the interfaces can be software modules, which are present, for example, on a microcontroller alongside other software modules.Also advantageous is a computer program product with program code stored on a machine-readable medium such as a semiconductor memory, a hard disk memory or an optical memory and used to carry out the evaluation when the program is executed by the evaluation and control unit.

[0009] In the present case, a current sensor is understood to mean a structural unit which comprises at least one sensor element which directly or indirectly detects the physical current as a physical quantity or a change in a physical quantity and outputs a measuring current as a linear image of the detected physical current of a corresponding phase of the drive arrangement.

[0010] The measures and further developments listed in the dependent claims enable advantageous improvements of the method specified in independent patent claim 1.

[0011] It is particularly advantageous that an offset current value of the individual current sensors can be determined and taken into account when determining the current measurement sets.

[0012] In an advantageous embodiment of the method, the offset current value of the corresponding current sensor can be determined easily and quickly in a currentless state of the drive arrangement.

[0013] In a further advantageous embodiment of the method, the at least one measurement parameter of the individual current sensors can, for example, correspond to a linear factor of the corresponding current sensor. Based on the initial linear factors and the determined linear factors of the individual current sensors, a correction factor can be calculated and stored, by which the determined linear factors can be multiplied. Using such a correction factor, the linear factors of the individual current sensors of the individual current measurement sets can be scaled without violating the condition that the sum of the physical currents of all phases of the drive arrangement is always zero. By skillfully selecting the factor, it is possible to ensure that the linear factors of the individual current sensors of the individual current measurement sets, multiplied by the correction factor, are close to the stored initial values ​​of the linear factors.The correction factor is typically in the range of 0.85 to 1.15.

[0014] In a further advantageous embodiment of the method, the at least one measurement parameter of the individual current sensors can be determined each time the drive arrangement is started and / or continuously during operation of the drive arrangement. This allows for continuous compensation of drift, for example, due to temperature changes, etc., of the at least one measurement parameter of the individual current sensors. Furthermore, the quality of the optimization or the optimization error of the at least one measurement parameter of the individual current sensors can be used to determine whether all current sensors are still functional.

[0015] In a further advantageous embodiment of the method, test pulses with different amplitudes can be used to determine the current measurement sets. This can further increase the accuracy of calculating at least one measurement parameter of the individual current sensors. Preferably, the amplitudes of the test pulses used can be selected to cover a measurement range of the individual current sensors.

[0016] Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description. In the drawings, like reference numerals designate components or elements that perform the same or similar functions. Short description of the drawings Fig. 1 shows a schematic representation of an embodiment of a drive arrangement according to the invention for a vehicle with an embodiment of a phase current measuring arrangement according to the invention for a drive arrangement with several phases. Fig. 2 shows a schematic flow diagram of an embodiment of a method according to the invention for adjusting a phase current measuring arrangement for a drive arrangement with several phases. Embodiments of the invention

[0017] As from Fig. 1, the illustrated embodiment of a drive arrangement 1 according to the invention for a vehicle comprises at least one multi-phase electric drive 5 and at least one multi-phase inverter 3. The inverter 3 generates from an operating direct current I B a multi-phase alternating current and outputs it to several phases P1, P2, P3 as a physical current i p,1 , i p,2, i p,3 to the at least one multi-phase electric drive 5. At least one current measuring arrangement 10 according to the invention is provided, which in the illustrated embodiment comprises an evaluation and control unit 12 and several current sensors 14, 16, 18. The evaluation and control unit determines and evaluates the physical currents i p,1 , i p,2 , i p,3 of phases P1, P2, P3 based on measuring currents i output by current sensors 14, 16, 18 m,1 , i m,2 , i m,3 and generates and outputs control signals to the at least one multi-phase inverter 3, which are suitable for controlling the physical currents i p,1 , i p,2 , i p,3 of the phases P1, P2, P3 for the electric drive 5.

[0018] In the illustrated embodiment, the electric drive comprises three windings L1, L2, L3, which are supplied by three phases P1, P2, P3 with physical currents i p,1 , i p,2 , i p,3 Therefore, the inverter 3 in the illustrated embodiment is designed as a three-phase inverter 3. At the input of the inverter, a smoothing capacitor C is arranged, to which an operating DC voltage U B The current measuring arrangement 10 can, for example, be used to implement phase current control for the electric drive 5.

[0019] As from Fig. 1, the phase current measuring arrangement 10 for a drive arrangement 1 with three phases P1, P2, P3 comprises an evaluation and control unit 12 and three current sensors 14, 16, 18 for the individual phases P1, P2, P3 of the drive arrangement 1. The phase current measuring arrangement 10 is designed as described below with reference to Fig. 2 described in the invention 100. For this purpose, the individual current sensors 14, 16, 18 each output a measuring current i m,1 , i m,2 , i m,3 as a linear representation of a recorded physical current i p,1 , i p,2 , i p,3 a corresponding phase P1, P2, P3 of the drive arrangement 1 to the evaluation and control unit 12. The evaluation and control unit 12 determines and stores based on the measuring currents i m,1 , i m,2 , i m,3 several current measuring sets, the number of which depends on the number of measuring parameters to be determined of the current sensors 14, 16, 18 of the drive arrangement 1, and which provided measuring currents i m,1 , i m,2 , i m,3 of simultaneously recorded physical currents i p,1 , i p,2 , i p,3of the individual current sensors 14, 16, 18. Based on the current measurement sets, the evaluation and control unit 12 sets up a system of equations for determining at least one measurement parameter of the individual current sensors 14, 16, 18. For each of the provided current sensors 14, 16, 18, an initial value for the at least one measurement parameter is stored. In this case, the stored initial value is inserted into the system of equations for the at least one measurement parameter of at least one first sensor 14, 16, 18. The evaluation and control unit 12 solves the system of equations by means of an optimization method, taking into account a property of the drive arrangement 1 that a sum of the physical currents i p,1 , i p,2 , i p,3of all phases P1, P2, P3 of the drive arrangement 1 is always zero. Furthermore, the evaluation and control unit 12 uses the determined at least one measurement parameter of the individual current sensors 14, 16, 18 to determine the physical currents i p,1 , i p,2 , i p,3 the individual phases P1, P2, P3 of drive arrangement 1.

[0020] As from Fig. 2, the method 100 for calibrating a phase current measuring arrangement 10 for a drive arrangement 1 with a plurality of phases P1, P2, P3 comprises a step S100 in which current sensors 14, 16, 18 are provided for the individual phases P1, P2, P3 of the drive arrangement 1. In a step S110, physical currents i are measured by means of the provided current sensors 14, 16, 18 p,1 , i p,2 , i p,3 of the individual phases P1, P2, P3 and measuring currents i m,1 , i m,2 , i m,3as linear representations of the recorded physical currents i p,1 , i p,2 , i p,3 In a step S120, based on the provided measuring currents i m,1 , i m,2 , i m,3 of the current sensors 14, 16, 18 current measurement sets are determined and stored in a step S130, the number of which depends on the number of measurement parameters to be determined for the individual current sensors 14, 16, 18, and which respectively provided measurement currents i m,1 , i m,2 , i m,3 of simultaneously recorded physical currents i p,1 , i p,2 , i p,3of the individual current sensors 14, 16, 18. In a step S140, a system of equations is set up to determine at least one measurement parameter of the individual current sensors 14, 16, 18 based on the determined and stored current measurement sets. In a step S150, an initial value for the at least one measurement parameter is stored for each of the provided current sensors 14, 16, 17. In a step S160, the stored initial value is inserted into the system of equations for the at least one measurement parameter of at least one first sensor 14, 16, 18. In a step S170, the system of equations is solved by means of an optimization method taking into account a property of the drive arrangement 1 that a sum of the physical currents i p,1 , i p,2 , i p,3of all phases P1, P2, P3 of the drive arrangement 1 is always zero. In a step S180, the determined at least one measurement parameter of the individual current sensors 14, 16, 18 is output and used to determine the physical currents i p,1 , i p,2 , i p,3 the individual phases P1, P2, P3 of the drive arrangement 1.

[0021] In the illustrated embodiments, the at least one measurement parameter of the individual current sensors 14, 16, 18 corresponds to a linear factor m1, m2, m3. The initial value of the at least one measurement parameter of the individual current sensors 14, 16, 18 corresponds to an initial linear factor m 1,ini , m 2,ini , m 3,ini . Therefore, the mapping behavior of the individual current sensors 14, 16, 18 is described by a linear model according to equation (1). im,k=mk*ip,k+io,k

[0022] Here, “i p,k” corresponds to the physical current of a k-th phase or a phase “k”. In addition, “m k “ the linear factor, “i m,k “ the measuring current and “i o,k “ the offset current value of a k-th current sensor or a current sensor of phase “k”.

[0023] In the illustrated embodiment, based on the initial values ​​of the linear factors or the initial linear factor m 1,ini , m 2,ini , m 3,ini and the determined linear factors m1, m2, m3 of the individual current sensors 14, 16, 18, a correction factor KF is calculated and stored, with which the parameter set [1 / m1, 1 / m2, 1 / m3] of the determined linear factors m1, m2, m3 is multiplied. By cleverly selecting the factor KF, which, depending on the application, is typically between 0.85 and 1.15, it can be achieved that the parameter set [KF / m1, KF / m2, KF / m3] is close to the original, good initial linear factors m 1,ini , m 2,ini , m 3,iniand still the condition Σ i p,k = 0 is met. This means that the amplitude error can be reduced. Here, the correction factor KF is calculated for the three linear factors m1, m2, and m3 according to equation (3), which results from the requirement of equation (2). KF∗(m1,inim1)∗KF∗(m2,inim2)∗KF∗(m3,inim3)=1 KF=(m1m1,ini)∗(m2m2,ini)∗(m3m3,ini)3

[0024] Alternatively, the correction factor KF can also be calculated using the sum of squares of the deviation between the initial linear factors m 1,ini , m 2,ini , m 3,ini and the optimized linear factors m1, m2, m3, or from the sums of squares of the relative deviations. The more measurement sets used for optimization, the better the influence of measurement noise can be suppressed.

[0025] Before determining the current measurement sets, the offset current values ​​i o,1 , i o,2 , io,3 of the individual current sensors 14, 16, 18 and taken into account when determining the current measurement sets. The offset current value i o,1 , i o,2 , i o,3 of the individual current sensors 14, 16, 18 are determined and stored in a de-energized state of the drive arrangement 1. When determining the current measurement sets, the offset current values ​​i o,1 , i o,2 , i o,3 of the measuring currents i m,1 , i m,2 , i m,3 subtracted and the resulting measuring currents i m,1 , i m,2 , i m,3 are then used to create the system of equations.

[0026] Based on equation (1) and the fact that the offset current values ​​i o,1 , i o,2 , i o,3 were already taken into account when determining the current measurement sets, as well as the property of the drive arrangement 1 that a sum of the physical currents i p,1 , i p,2 , i p,3of all phases P1, P2, P3 of the drive arrangement 1 is always zero, the system of equations (4) results for n current measuring sets. [im1,1im2,1im3,1im1,2im2,2im3,2⋮⋮⋮im1,nim2,nim3,n]∗[1m11m21m3]=[00⋮0]

[0027] Since the linear factor m1 of the first current sensor 14 is determined by its initial linear factor m 1,ini is replaced, its value can be set to yield the system of equations (5), which is solved to determine the linear factors m2 and m3. [im2,1im3,1im2,2im3,2⋮⋮im2,ni3,n]∗[1m21m3]=[−1m1,ini∗im,1,1−1m1,ini∗im,1,2⋮−1m1,ini∗im,1,n]

[0028] In the illustrated embodiments, a method for minimizing calculated squared errors is used as the optimization method for solving the system of equations (5). Alternatively, other suitable optimization methods, such as a recursive method for minimizing calculated squared errors, can also be used.

[0029] During operation, the condition Σ i p,k = 0. If, when determining the physical currents i p,1 , i p,2 , i p,3 of the individual phases P1, P2, P3 of the drive arrangement 1 from the determined linear factors m1, m2, m3 result in the current sum Σ i p,k ≠ 0, then the initial linear factor m used for the linear factor m1 of the first current sensor 14 was 1,ini was not accurate enough or that the properties of the current sensors 14, 16, 18 have changed due to temperature fluctuations or over their lifetime. These deviations can be improved by using the correction factor KF calculated according to equation (3). This means that the parameter set [1 / m 1,ini , 1 / m2, 1 / m3] of the determined linear factors m 1,ini , m2, m3 is multiplied by the correction factor KF and the generated new parameter set [KF / m 1,ini, KF / m2, KF / m3] for the re-determination of the physical flows i p,1 , i p,2 , i p,3 the individual phases P1, P2, P3 of the drive arrangement 1.

[0030] Since the linear factor m1 of the first current sensor 14 is determined by its initial linear factor m 1,ini is replaced, the number of current measuring sets used to set up the DC system is one less than the number of sensors used. In the illustrated embodiment of the drive arrangement 1 with three phases, only two current measuring sets are then required to set up the system of equations. This means that in addition to one current measuring set, which is based on current values ​​of the measuring currents i m,1 , i m,2 , i m,3based, at least one stored current measurement set is used to set up and solve the system of equations for determining the unknown linear factors m2, m3 of the two current sensors 16, 18. In the illustrated embodiment, a total of "n" current measurement sets are used to set up the systems of equations (2) and (3). This means that in addition to the current measurement set, which is based on current values ​​of the measuring currents i m,1 , i m,2 , i m,3 Based on the equation system (2) and (3), n-1 stored current measurement sets are used to set up and solve the systems of equations (2) and (3) to determine the two linear factors m2, m3 of the two current sensors 16, 18. The number n of current measurement sets used is chosen, for example, in the range from 5 to 25.

[0031] In the illustrated embodiment, the at least one measurement parameter of the individual current sensors 14, 16, 18 is determined each time the drive arrangement 1 is started and continuously during the operation of the drive arrangement 1.

[0032] Test pulses with different amplitudes are used to determine the current measurement sets. The amplitudes of the test pulses are selected to cover the measuring ranges of the individual current sensors 14, 16, and 18.

Claims

[1] Method (100) for calibrating a phase current measuring arrangement (10) for a drive arrangement (1) with several phases (P1, P2, P3), comprising the steps of: providing current sensors (14, 16, 18) for the individual phases (P1, P2, P3) of the drive arrangement (1); detecting physical currents (i p,1 , i p,2 , i p,3 ) of the individual phases (P1, P2, P3) and providing measuring currents (i m,1 , i m,2 , i m,3 ) as linear representations of the recorded physical currents (i p,1 , i p,2 , i p,3 ) by means of the provided current sensors (14, 16, 18); determining and storing current measurement sets based on the provided measuring currents (i m,1 , i m,2 , i m,3 ) of the current sensors (14, 16, 18), the number of which depends on a number of measurement parameters of the current sensors (14, 16, 18) to be determined, and which respectively provide measuring currents (i m,1 , i m,2 , im,3 ) of simultaneously recorded physical currents (i p,1 , i p,2 , i p,3 ) of the individual current sensors (14, 16, 18); setting up a system of equations for determining at least one measurement parameter of the individual current sensors (14, 16, 18) based on the determined and stored current measurement sets, wherein an initial value for the at least one measurement parameter is stored for each of the provided current sensors (14, 16, 17); wherein the stored initial value is inserted into the system of equations for the at least one measurement parameter of at least one first sensor (14, 16, 18); solving the system of equations by means of an optimization method taking into account a property of the drive arrangement (1) such that a sum of the physical currents (i p,1 , i p,2 , i p,3) of all phases (P1, P2, P3) of the drive arrangement (1) is always zero; and output and use of the determined at least one measurement parameter of the individual current sensors (14, 16, 18) to determine the physical currents (i p,1 , i p,2 , i p,3 ) of the individual phases (P1, P2, P3) of the drive arrangement (1). [2] Method (100) according to claim 1, characterized by that an offset current value (i o,1 , i o,2 , i o,3 ) of the individual current sensors (14, 16, 18) is determined and taken into account when determining the current measurement sets. [3] Method (100) according to claim 2, characterized by that the offset current value (i o,1 , i o,2 , i o,3 ) of the corresponding current sensor (14, 16, 18) is determined in a currentless state of the drive arrangement (1). [4] Method (100) according to one of claims 1 to 3, characterized bythat the at least one measuring parameter of the individual current sensors (14, 16, 18) corresponds to a linear factor (m1, m2, m3). [5] Method (100) according to claim 4, characterized by that based on initial linear factors (m 1,ini , m 2,ini , m 3,ini ) and the determined linear factors (m1, m2, m3) of the individual current sensors (14, 16, 18), a correction factor (KF) is calculated and stored, with which the determined linear factors (m1, m2, m3) are multiplied. [6] Method (100) according to one of claims 1 to 5, characterized by that the at least one measurement parameter of the individual current sensors (14, 16, 18) is determined each time the drive arrangement (1) is started and / or continuously during operation of the drive arrangement (1). [7] Method (100) according to one of claims 1 to 6, characterized by that test pulses with different amplitudes are used to determine the current measurement sets. [8] Method (100) according to claim 7, characterized by that the amplitudes of the test pulses used are selected so that a measuring range of the individual current sensors (14, 16, 18) is covered. [9] Phase current measuring arrangement (10) for a drive arrangement (1) with a plurality of phases (P1, P2, P3), which comprises an evaluation and control unit (12) and a plurality of current sensors (14, 16, 18) for the individual phases (P1, P2, P3) of the drive arrangement (1) and is designed to carry out the method (100) according to one of claims 1 to 8, wherein the individual current sensors (14, 16, 18) are each designed to measure a measuring current (i m,1 , i m,2 , i m,3 ) as a linear representation of a recorded physical current (i p,1 , i p,2 , i p,3) of a corresponding phase (P1, P2, P3) of the drive arrangement (1) to the evaluation and control unit (12), wherein the evaluation and control unit (12) is designed to be based on the measuring currents (i m,1 , i m,2 , i m,3 ) to determine and store current measurement sets, the number of which depends on a number of measurement parameters to be determined of the current sensors (14, 16,18) of the drive arrangement (1), and which provide measurement currents (i m,1 , i m,2 , i m,3 ) of simultaneously recorded physical currents (i p,1 , i p,2 , i p,3) of the individual current sensors (14, 16, 18), and to set up a system of equations based on the current measurement sets for determining at least one measurement parameter of the individual current sensors (14, 16, 18), wherein for each of the provided current sensors (14, 16, 18) an initial value for the at least one measurement parameter is stored, wherein for the at least one measurement parameter of at least one first sensor (14, 16, 18) the stored initial value is inserted into the system of equations, wherein the evaluation and control unit (12) is further designed to solve the system of equations by means of an optimization method taking into account a property of the drive arrangement (1) such that a sum of the physical currents (i p,1 , i p,2 , i p,3) of all phases (P1, P2, P3) of the drive arrangement (1) is always zero; and the determined at least one measurement parameter of the individual current sensors (14, 16, 18) for determining the physical currents (i p,1 , i p,2 , i p,3 ) of the individual phases (P1, P2, P3) of the drive arrangement (1). [10] Drive arrangement (1) for a vehicle, with at least one multi-phase electric drive (5) and at least one multi-phase inverter (3), which is designed to be powered from an operating direct current (I B ) to generate a multi-phase alternating current and to distribute it on several phases (P1, P2, P3) as a physical current (i p,1 , i p,2 , i p,3) to the at least one multi-phase electric drive (5), wherein at least one current measuring arrangement (10) designed according to claim 9 is provided with an evaluation and control unit (12) and a plurality of current sensors (14, 16, 18), wherein the evaluation and control unit (12) is designed to measure the physical currents (i p,1 , i p,2 , i p,3 ) of the phases (P1, P2, P3) based on measuring currents (i m,1 , i m,2 , i m,3 ) and evaluate it, wherein the evaluation and control unit (12) is further designed to generate control signals and to output them to the at least one multi-phase inverter (3), which are suitable for determining the physical currents (i p,1 , i p,2 , i p,3 ) of the phases (P1, P2, P3) for the electric drive (5).

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