WO2016084771A1

WO2016084771A1 - Motor drive device for electric automobile

Info

Publication number: WO2016084771A1
Application number: PCT/JP2015/082855
Authority: WO
Inventors: 明良西川
Original assignee: Ntn株式会社
Priority date: 2014-11-25
Filing date: 2015-11-24
Publication date: 2016-06-02
Also published as: JP6448995B2; JP2016101021A

Abstract

A motor drive device (3) for driving a motor (2) as a travel driving source for an electric automobile (1), wherein matching of the motor and a motor drive program during replacement of the motor drive device or replacement of the motor is made unnecessary, and it is thereby possible to avoid unexpected changes in constants, to ensure safety, and to facilitate, or eliminate the need for, changing of program content in accordance with differences between individual motors, which is a hindrance in electric automobile manufacturing. This motor drive device (3) has a storage unit (14) for storing constants used to control the motor (2), an external communication interface (18) connectable to and removable from an external connection device (17), and a constant setting processing unit (19) for setting a prescribed constant as a value specific to the individual motor (2) from the external connection device (17) from among the constants stored in the storage unit (14). The abovementioned constant is an offset amount θo between a sensor reference point P1 and an electrical angle reference point P0 of a rotation angle sensor (4), for example.

Description

Electric vehicle motor drive device

Related applications

This application claims the priority of Japanese Patent Application No. 2014-237320 filed on Nov. 25, 2014, and is incorporated herein by reference in its entirety.

The present invention relates to a motor drive device for an electric vehicle that controls driving of the motor in an electric vehicle, such as a vehicle that is driven and driven only by an electric motor, a hybrid vehicle that uses an engine and a motor, and a fuel cell vehicle.

In an electric vehicle, when a motor is used for driving, particularly when a synchronous motor is used, an electric angle necessary for control is calculated using a rotation angle sensor that acquires a rotation angle of the synchronous motor. Here, when the angle output from the rotation angle sensor is converted to an electrical angle, the origin in the mechanical phase determined by the magnet position of the motor (electrical angle origin) and the measurement reference point of the rotation angle sensor (sensor origin) ) Must be the same as the offset amount. Until now, the offset amount has been written in the motor drive program.

JP-A-9-229168 Japanese Patent No. 2753225 JP-A-5-52892 JP 2008-49731 A

As described above, conventionally, since the offset amount for matching the reference point of the measurement of the rotation angle sensor is written in the program of the motor drive device, there is an association or association between the program and the motor, There was no method for easily changing the combination of the motor driving device and the motor in which the program was written. This will be specifically described.

(Role of the rotation angle sensor in the motor for traveling)
Various motors can be used as a motor for driving an electric vehicle, but a synchronous motor using a permanent magnet is generally used in consideration of performance. In addition, when driving this motor, there is a method of driving without using the rotation angle sensor, but in many cases, the rotation angle is applied to the output shaft of the motor or the rotation shaft after acceleration / deceleration in the vicinity. In general, a method is used in which a sensor is attached, the positional relationship between a coil and a magnet in the motor is acquired, and an optimum current amount is determined therefrom.

For simplification of explanation, a synchronous motor in which a coil is arranged in a stator and a magnet is arranged in a rotor will be described with a rotation angle sensor attached to a motor output shaft. When this synchronous motor is employed as a motor for running an electric vehicle and the motor 2 is driven using the rotation angle sensor 4 as shown in FIG. 7, the measurement reference point (sensor origin P1) of the rotation angle sensor 4; The motor 2 cannot be correctly controlled unless the origin (electrical angle origin P0) on the motor control determined from the positional relationship between the magnet position of the rotor and the coil position of the stator matches.

There are two methods for solving this problem by matching the origin P1 of the rotation angle sensor and the origin P0 on the motor control. The first is a method of adding an angle formed by the sensor origin P1 and the electrical angle origin P0 on the control after assembling the motor in an arbitrary positional relationship. A specific method is shown. If the three positional relationships of the rotation angle sensor, the stator, and the rotor are arbitrarily set, there is an angle θo between the sensor origin P1 and the electrical angle origin P0. The rotation angle sensor 4 detects θ between the sensor origin P1 and the detection point P2, and since the angle necessary for control is the angle from the electrical angle origin P0 to the detection point P2, θ + θo is used for control. It will be good. Therefore, θo そこで obtained by experiment is stored in the program as an offset amount, and a necessary angle is obtained by adding θ + θo in addition to θ measured sequentially at the time of control. The second is a method of assembling the motor without shifting the two origins P1, P0. With this method, it is not necessary to consider the offset amount θo. Specifically, a jig for fixing the rotation angle sensor, the stator, and the rotor so that the positional relationship between them does not change is prepared, and the rotation angle sensor 4 is attached so that θo０ = 0.

Ideally, it is desirable to adopt the second method, but this method is practically difficult if this method cannot be adopted due to the internal structure or if the accuracy required for jigs and assembly is high. There are many cases. In that case, it is necessary to select the first method and reflect the offset amount θo in the program of the motor drive device. However, the offset amount θo has a different value depending on the motor individual, and it is necessary to adapt the offset amount θo suitable for each motor individual in the program.

(Problems when reflecting to the motor drive program)
Synchronous motors have been widely used not only for electric vehicles but also for industrial purposes (for large machines). Similarly, there is a deviation between the two origins P1 and P0, and control is performed using the correct offset amount θo. As an adaptation method of the offset amount θo at this time, an interface is generally attached to the motor drive device for industrial use, and the offset amount θo is input using the interface, and a nonvolatile storage area ( Often stored in EEPROM).

On the other hand, in an electric vehicle, such an interface is rarely installed in the motor drive device main body and the electric vehicle from the viewpoint of durability problems and prevention of accidents due to easy operation. Therefore, a method of changing the variable indicating the offset amount θo in the program, converting it into a machine language (generally called a build), and saving it in the instruction storage area of the CPU する that executes the control program of the motor drive device I had to take it.

The problem with this method is that there is a risk of accidentally changing unnecessary parts in the program, or after the program is stored in the CPU of the motor drive device, the motor and the motor drive device are linked. It is to become. In particular, when the motor and the motor drive device are linked, it is necessary to change the program stored at the time of manufacturing the electric vehicle at a repair shop when it is necessary to replace the motor during repair in the market. The procedure in this case is complicated. In addition, mistakes in program changes may cause the control device to run out of control, possibly causing destruction of peripheral elements and motors, and are difficult to adopt.

(Change of the offset amount using a general-purpose external connection device)
For the reasons described above, it is difficult to rewrite a part of the program to a value suitable for the individual motor and to burn into the CPU what was converted into machine language by the build, that is, to save in the instruction storage area as described above, When the motor drive device includes a nonvolatile storage device (for example, EEPROM) that stores parameters necessary for control, it is easy to store the offset amount therein. Specifically, a general-purpose external connection device is connected to the motor drive device, communicates with the CPU of the external connection device and the motor drive device, and the CPU stores predetermined parameters in the EEPROM in response to a command from the external connection device. is there.

The general-purpose external connection device as described above has already been put into practical use and widely used in maintenance shops. Patent Document 1 proposes a method for specifying a necessary setting pattern through a communication interface in order to easily use a plurality of setting patterns, for example, settings and adjustments for each vehicle type, for a control device of an in-vehicle device. A possible control device is proposed. Further, Patent Document 2 discloses a mechanism that allows a program in the control device to be changed using a recording medium such as a compact disc, and allows the control program in the control device to be changed from the outside. In addition, an interface for rewriting the setting in the control device or the program is also widespread, and as a representative one, it is possible to easily diagnose a failure by connecting to a vehicle communication network as in Patent Document 3. According to Patent Document 4, the increase or decrease of the fuel injection amount is adjusted by using a failure diagnosis tester corresponding to CAN (Control Area Network) communication and its equivalent, and hydraulic pressure, oil A method for collecting the output of the temperature sensor has been proposed.

These external connection devices are provided only to maintenance factories, etc., and the communication is also restricted in certain procedures (communication of passcodes and restrictions that cannot be accepted unless they communicate according to a certain format). Request), and no unnecessary changes are made.

However, each of the above-mentioned prior arts all wants to be updated due to a defect in the program, or to change the ride quality later, i.e., to change the response from the vehicle during driving later (the fuel injection amount is reduced). Technology that makes it unnecessary to match the motor and the motor drive device in consideration of individual differences in the motor. Has not yet been proposed. In addition, constants necessary for motor control (for example, the offset amount and the direction of rotation) are always necessary, but each of the conventional technologies uses an indefinite value at the time of manufacturing the motor and the motor control device. It is not a technology that is manufactured on the premise that additional writing (rewriting) is performed, but is a technology that updates or customizes the motor drive device that is manufactured so that it can run when there is no particular problem as described above.

The object of the present invention is to obstruct the manufacture of an electric vehicle by eliminating the need for matching between the motor and the motor drive program at the time of replacement of the motor drive device or motor replacement at the time of electric vehicle manufacture or repair in the market. It is an object of the present invention to provide a motor drive device for an electric vehicle that can eliminate or simplify the program content change according to the individual difference of the motor, and can avoid unexpected constant changes and ensure safety.

Hereinafter, in order to facilitate understanding, the present invention will be described with reference to the reference numerals of the embodiments for convenience.

An electric vehicle motor drive device according to the present invention is a motor drive device 3 that drives a motor 2 that is a travel drive source of an electric vehicle 1,
A storage unit 14 for storing constants used for controlling the motor 2; an external communication interface 18 connected to the external connection device 17 capable of transmitting information; Of the constants stored in the storage unit 14, a predetermined constant that is specific to the individual motor 2 is set to a numerical value transmitted from the external connection device 17 via the external communication interface 18. Constant setting processing unit 19. Note that the above “constant” means a number including one of two values such as a flag.

According to this configuration, among the constants used for controlling the motor 2, a predetermined constant that is specific to the individual motor 2 is set to a numerical value transmitted from the external connection device 17 via the external communication interface 18. A constant setting processing unit 19 is provided. For this reason, among the constants used in the motor drive program of the motor drive device 3, constants that cause individual differences of the motor 2 are transmitted and set from the external connection device 17 as described above, so that the motor 2 and the motor drive are set. Matching with the motor drive program in the apparatus 3 can be made unnecessary, and changing the contents of the program according to individual differences of the motor 2 that hinders the manufacture of the electric vehicle can be made unnecessary or simplified. In addition, since the electric vehicle 1 itself is not provided with a function unit for inputting the change of the constant, the external connection device 17 is connected and the numerical value corresponding to the constant is input. Therefore, no change is required for each motor 2. Unexpected changes to constants are avoided, and safety can be ensured.

In the present invention, the motor 2 includes a rotation angle sensor 4, a sensor origin P 1 that is a measurement reference of the rotation angle sensor 4, and an electrical angle origin that is a control reference point of the motor 2 that is necessary for the control of the motor 2. There is an offset amount θo in P0, and the constant setting processing unit 19 may include at least the offset amount θo as a numerical value transmitted and set from the external connection device 17. Of the constants necessary for the control of the motor 2, a typical constant causing an individual difference is the offset amount θo between the sensor origin P1 and the electrical angle origin P0. This offset amount θo becomes a known value by measuring it at the time of manufacturing the motor 2 and recording it on the motor itself by imprinting or the like. When the combination of the motor 2 and the motor drive device 3 is changed due to a failure of the motor 2 or a failure of the motor drive device 3, the known offset amount θo is input from the external connection device 17 to the motor drive device 3. Thus, the combination of the motor 2 and the motor drive device 3 can be changed without causing a problem with the offset amount θo between the sensor origin P1 and the electrical angle origin P0 that are individual differences of the motor 2.

In this case, the storage unit 14 for setting a numerical value by the constant setting processing unit 19 may be a nonvolatile storage device 14. By storing the offset amount θo in the non-volatile storage device 14, it is possible to prevent the storage of the offset amount θo from being accidentally lost.

When the nonvolatile storage device 14 is used in this way, the storage area 16 used for motor control in response to the power-on of the motor driving device 3 using the offset amount θo stored in the nonvolatile storage device 14. A storage constant reading unit 20 for reading may be provided. The reading speed of information from the non-volatile storage device 14 is generally relatively slow, and there are cases where motor control cannot be performed with high accuracy by reading when controlling the motor 2 that rotates at high speed. However, when the motor drive device 3 is powered on, it can be controlled at high speed by storing it in an appropriate storage area 16 used for motor control, such as a register in the CPU constituting the motor drive device 3. In this way, it is possible to achieve both the avoidance of the unexpected disappearance of the offset amount θo and the highly accurate control by increasing the reading speed.

In the motor drive device for an electric vehicle according to the present invention, the motor 2 alone can set the positive direction of the rotation direction to any direction, and the positive direction is determined by the mounting direction to the vehicle. The constant setting processing unit 19 may include a value specifying the positive direction of the rotation direction of the motor 2 as a numerical value transmitted and set from the external connection device 17. Depending on the type of the motor 2, there is one that can set the positive direction of rotation in any direction. In particular, in the in-wheel motor driving device 7, the in-wheel motor driving device 7 having the same configuration is connected to the left and right wheels 9. May be used with their directions reversed. In such a case, if the constant setting processing unit 19 includes a value specifying the positive direction of the rotation direction of the motor 2 as a numerical value transmitted and set from the external connection device 17, the configuration is the same. Even if the motor 2 is installed in an arbitrary direction depending on the installation location, the motor 2 can be properly recognized and controlled after the motor is assembled to the vehicle.

Any combination of at least two configurations disclosed in the claims and / or the specification and / or the drawings is included in the present invention. In particular, any combination of two or more of each claim in the claims is included in the invention.

The present invention will be understood more clearly from the following description of preferred embodiments with reference to the accompanying drawings. However, the embodiments and drawings are for illustration and description only and should not be used to define the scope of the present invention. The scope of the invention is defined by the appended claims. In the accompanying drawings, the same reference numerals in a plurality of drawings indicate the same or corresponding parts.

It is a block diagram which shows the conceptual structure of the motor drive device of the electric vehicle which concerns on one Embodiment of this invention. FIG. 3 is a block diagram in which the same block diagram is re-expressed by paying attention to a portion used during constant rewriting processing. It is the block diagram which re-expressed the block diagram paying attention to the part used at the time of motor drive. (A) is a flowchart showing processing of the external connection device at the time of rewriting to the motor driving device, and (B) is a flowchart showing processing of the motor driving device at the time of rewriting. It is a flowchart which shows the process at the time of the motor drive in the motor drive device. It is a top view which shows the conceptual structure of an in-wheel motor vehicle. It is explanatory drawing which shows the relationship between a motor, the origin of a rotation angle sensor, etc.

An embodiment of the present invention will be described with reference to FIGS. In FIG. 1, an electric vehicle 1 includes a motor 2 for driving driving and a motor driving device 3 that controls the motor 2, and the motor 2 includes a rotation angle sensor 4. The rotation angle sensor 4 is a resolver, an encoder, or a magnetic sensor. The motor 2 is, for example, a synchronous motor that has a permanent magnet and is driven by a three-phase alternating current. In addition, FIG. 1 is a figure explaining paying attention to one motor.

For example, as shown in FIG. 6, the motor 2 constitutes an in-wheel motor drive device 7 together with the wheel bearing 5 and the speed reducer 6, and is individually mounted on the wheel 9 that is the drive wheel of the electric vehicle 1. The electric vehicle 1 in the figure is an example of a two-wheel drive rear wheel drive vehicle in which the rear wheel 9 is a driving wheel and the front wheel 8 is a driven wheel.

The motor driving device 3 is provided for each motor 2 when the electric vehicle 1 is equipped with a plurality of motors 2 as in the example of FIG. When the motor 2 is of a type driven by an alternating current such as a synchronous motor, the motor driving device 3 may be called an “inverter device” because it includes an inverter. An ECU (electronic control unit) 10 that performs overall control and cooperative control of the entire electric vehicle is provided as an upper control unit of the motor drive device 3. The electric vehicle 1 may be a four-wheel drive in which the in-wheel motor drive device 7 is mounted on the front and

rear wheels

8 and 9, or a front wheel drive in which the in-wheel motor drive device 7 is mounted only on the front wheel 8. There may also be a one-motor type or two-motor type vehicle in which the motor 2 is mounted on a chassis (not shown). In the case of the single motor type, the motor drive device 3 may be configured to have the function of the ECU 10 without providing the independent ECU 10.

In FIG. 1, the motor drive device 3 performs a main control calculation with a rotation angle calculation unit 11 that calculates the rotation angle θ from the detection signal S of the rotation angle sensor 4, and in many cases the CPU performs a control calculation corresponding thereto. The motor drive unit 13 is a power circuit unit corresponding to an inverter including an FET, IGBT, or the like that controls the current amount, an EEPROM that stores parameters and error codes necessary for control, and the like. A nonvolatile storage device 14 is provided. The nonvolatile storage device 14 is a “storage device” in the present invention.

The control calculation unit 12 includes a motor drive calculation unit 15 configured by a program for performing calculation necessary for current control for motor drive such as vector control in accordance with the command torque T supplied from the torque command unit 21. Is provided. The torque command unit 21 generates the command torque T to each motor 2 from the operation amount of an accelerator operation unit (not shown) such as an accelerator pedal and a brake operation unit (not shown) such as a brake pedal. For example, it is provided in the ECU 10 (FIG. 6) or the like serving as a host control unit. The torque command unit 21 may be the accelerator operation unit itself. The motor drive calculation unit 15 specifically has a predetermined conversion function stored in a LUT (Look Up Table) implemented by software or hardware, or a software library (Library), or an equivalent thereof. For example, a PWM (pulse width modulation) signal is output to the motor drive unit 13 in response to an input of the command torque T given from the torque command unit 21 using hardware or the like (hereinafter referred to as “realization model”). And a software function on a hardware circuit or a processor (not shown).

In addition to the above, the control calculation unit 12 of FIG. 1 includes a general-purpose volatile storage area 16 for storing various calculation results and changing parameters, and is represented by a module that communicates with the external connection device 17. The external communication interface 18 is provided. This communication form corresponds to a simple communication method such as serial communication or parallel communication, CAN (Control Area Network), or in-vehicle LAN (Local Area Network).

The external connection device 17 is called a failure diagnosis device or diagnosis system composed of, for example, a personal computer or a tablet-type portable information terminal, and has a minimum data transmission function and a logging function necessary for communication. There are those possessed and those capable of operating to update the internal constant, and in this embodiment, a popular product having such a function is used.

The volatile storage area 16 described above corresponds to, for example, a register of a CPU that constitutes the motor driving device 3. The role sharing with the non-volatile storage device 14 provided outside the CPU depends on the content determination timing and the change frequency. In addition to the volatile storage area 16, the CPU has a non-rewritable non-volatile storage area (not shown) for storing an execution program represented by a program memory. And information that does not need to be changed, such as constants that do not need to be changed. The volatile storage area 16 stores a numerical value that is constantly changed, represented by a calculation result and the number of repetitions, and a numerical value that is not calculated when the motor driving device 3 is activated. Further, since the power supply of the motor driving device 3 is turned off, the motor drive device 3 is refreshed and saved in the volatile storage area 16 even if it is updated to the initial value.

The nonvolatile storage device 14 stores numerical values that should be retained even when the power is turned off and that need to be changed. Specifically, this includes an error code, an accumulated travel distance, a control constant optimized for the mounted vehicle, information on the positive direction of the operation direction that varies depending on the mounted vehicle, and the like. The origin position of the motor 2 cannot be calculated by a program, needs to be changed when the vehicle is assembled or repaired, and should be retained even when the power is turned off. Save to device 14. If there is an area in the CPU that has non-volatile characteristics and can be easily rewritten (the contents can be changed by a program operation), there is no need to have a non-volatile storage area outside the CPU. May be a region provided in the CPU and having the above non-volatile characteristics and easy to rewrite.

This motor drive device 3 is provided with the following constant setting processing unit 19 and storage constant reading unit 20 in addition to the above basic configuration. The constant setting processing unit 19 and the stored constant reading unit 20 are constituted by a part of the program that constitutes the control arithmetic unit 12.

The constant setting processing unit 19 sends, from the external connection device 17 to the external communication, a predetermined constant that is a value specific to the individual motor 2 among the constants stored in the nonvolatile storage device 14. It is a functional unit that sets a numerical value transmitted through the interface 18. Specifically, the constant setting processing unit 19 receives a numerical value transmitted via the external communication interface 18 using a predetermined data transfer function stored in a software library or hardware equivalent thereto. Thus, it is configured by a hardware circuit or a software function on a processor (not shown) that can be stored at a predetermined address of the nonvolatile memory device 14. The storage constant reading unit 20 is necessary for the control of the motor origin 2 and the sensor origin P1 as a measurement reference of the rotation angle sensor 4 as constants transmitted from the external connection device 17 and set in the nonvolatile storage device 14. An offset amount θo with respect to the electrical angle origin P0 that is the control reference point of the motor 2 and a flag that is a value of 1 or 0 that is a numerical value indicating the positive driving direction of the motor 2 are set. More specifically, the storage constant reading unit 20 performs the processing of the flowchart shown in FIG.

In addition, the storage constant reading unit 20 uses the offset amount θo stored in the nonvolatile storage device 14 as a storage area used for motor control in response to power-on of the motor driving device 3. This is a functional unit that reads data into the storage area 16, and is configured as a part of an instruction that reads each constant when the power is turned on. Specifically, the storage constant reading unit 20 calculates the offset amount θo between the sensor origin P1 and the electrical angle origin P0 and the flag using the above-described implementation model, and stores them in a software library. A hardware circuit or a processor (non-determined) that can store the offset amount θo in the spontaneous memory area 16 when the motor driving device 3 is turned on using a predetermined data transfer function or hardware equivalent thereto. It is composed of the above software functions. More specifically, the storage constant reading unit 20 performs the processing of the flowchart shown in FIG.

Next, an explanation will be given of the initial setting at the time of vehicle assembly or after replacement of the motor 2 by repair. FIG. 2 is a diagram re-expressed focusing on the portion that functions at this time in FIG. Further, the flow of processing of the external connection device 17 at this time is shown in FIG. 4A, and the flow of the motor driving device 3 is shown in FIG. 4B.

The offset amount θo determined by the individual difference of the motor 2 is calculated when the motor is manufactured, and is specified by, for example, engraving or recorded by a data sheet. An operator (a vehicle assembly worker or a vehicle repair shop worker) who assembles the motor 2 in the vehicle connects the external connection device 17 to the motor drive device 3 to perform communication. Actually, the external connection device 17 communicates with the constant setting processing unit 19 and the like of the control calculation unit 12 in the motor driving device 3 via the external communication interface 18.

After communication is started (step Q1 in FIG. 4A, step R1 in FIG. 4B), a predetermined communication procedure, for example, exchange of a pass code, communication according to a certain format, etc. The unit 12 stops the arithmetic processing, does not drive the motor 2, and makes a transition to a maintenance-dedicated state generally called a maintenance mode. Specifically, after the start of the communication, the external connection device 17 requests change permission (step Q2) and waits for change permission (step Q3). When the motor drive device 3 receives the change permission request (step R2), it determines whether or not the communication is appropriate (step R3), and transmits the change permission if the communication is appropriate (step R4).

Thereafter, according to a preset format, the external connection device 17 is used to transmit the offset amount θo to the control calculation unit 12 (steps Q4 to Q6). More specifically, the offset amount θo is selected from the changeable items (step Q4), the offset amount θo is determined (step Q5), and the determined offset amount θo is transmitted (Q6).

Upon receiving the offset amount θo (step R5), the control calculation unit 12 stores the offset amount θo in the volatile storage area 16 or converts it into a numerical format suitable for storage in the nonvolatile storage device 14 or the like. After the processing, it is stored in the designated address of the nonvolatile storage device 14 (step R6). The operator disconnects communication between the external connection device 17 and the motor 2 and ends the work. For simplification of description, the motor drive device 3 will be described as being once turned off.

Next, FIG. 3 shows a diagram re-expressed by paying attention to the portion that functions during normal running in FIG. 1, and FIG. 5 shows the flow of the motor drive device 3. When the motor drive device 3 is turned on, the activation is confirmed (step S1), and then the program stored in the program memory is started. While the program is initializing various variables (step S2), the reading of the offset amount θo is defined, and the offset amount θo is read from the nonvolatile storage device 14 (step S3). The read offset amount θo is stored in the volatile storage area 16 and used for subsequent control.

Subsequently, motor driving is started (step S4). The rotation angle sensor 4 outputs a detection signal S in the form of an electrical signal or communication data indicating the absolute angle of the motor 2 and the displacement from the initial position. Based on the detection signal S, the rotation angle calculation unit 11 calculates a physically meaningful angle signal θ. This processing includes, for example, reading by comparing a plurality of analog signals, reading an absolute angle converted to an analog voltage, converting serial data obtained by communication into a numerical value, and the like. When the detection signal S is an angle signal θ that can be used as it is, the rotation angle calculation unit 11 can be omitted. The rotation angle θ may be temporarily stored in the volatile storage area 16. The control calculation unit 12 adds the offset amount θo stored in the volatile storage area 16 to the rotation angle θ obtained from the rotation angle calculation unit 11 in step S5 (whether or not to add depends on the reference direction and is set) It is subtracted depending on the direction), and is transmitted as an angle θ + θo required for control (step S6) to the motor drive calculation unit 15. The motor drive calculation unit 15 determines a specific operation of the motor drive unit 13 based on the angle θ + θo and the command torque T that determines the amount of current to be driven, and generates a command to the motor drive unit 13 (step S7). . With the above flow, the motor 2 is driven by a current.

This embodiment has the following advantages or effects. First, it will be easier to repair in the market. As described above, when a control method that requires an offset amount is adopted, even if either the motor 2 or the motor drive device 3 fails and needs to be replaced, the offset can be obtained by using the external connection device 17. This is because the amount θo can be changed. Next, it is not necessary to pay attention to the combination and tying of the motor 2 and the motor driving device 3. This is because any combination of several options of the motor 2 and the motor driving device 3 can be adopted as long as the power line, the rotation angle sensor, and the control method are shared. In addition, since the offset amount θo, which is an individual difference that may cause a problem in controlling the motor 2, can be easily stored in the motor driving device 3, it is necessary to pay attention to the association between the motor 2 and the motor driving device 3. Disappear.

Finally, a factor that is necessary for control and is undefined until the motor is assembled to the vehicle, for example, the positive direction of the rotation direction of the motor 2 can be specified in this embodiment. This is because when the motor 2 and the motor driving device 3 are generalized, and the two are mounted on a general-purpose vehicle body, for example, the direction in which the vehicle should be rotated to move forward changes depending on the mounting direction of the motor 2. This is because it cannot be defined at the stage of shipping the motor drive device 3, but it is advantageous that it can be specified after the motor is mounted on the vehicle. Similarly, as in the in-wheel motor vehicle as shown in FIG. 6, it is necessary to rotate the two motors 2 in directions opposite to each other when traveling from the viewpoint of the wiring of the motor 2 and the phase of the electrical angle. In this case, it can be changed by the method described above, which is an advantage.

It should be noted that the conventional techniques for updating the constant using the external connection device 17 are all for updating due to a problem in the program, or for changing the ride quality later (increasing or decreasing the fuel injection amount), etc. It is premised on updating and customization that can be applied to all vehicles of that vehicle type. In contrast, in this embodiment, constants necessary for controlling the motor 2 (here, the offset amount θo and the direction of rotation) are necessarily required, but the motor 2 and the motor control device 3 were manufactured. At the time, it is possible to manufacture on the assumption that an indefinite numerical value is additionally written (rewritten) from the outside. By using the configuration of this embodiment, necessary changes can be made, but since the items that can be changed are determined in advance, there is no need for control constants that can be changed by directly rewriting the program and should not be changed. It is possible to prevent the motor driving device 3 and the motor 2 from running out of control or changing the part related to the communication function of the program and losing the communication function.

Because of these advantages, the following sales formats can be handled. For example, when the motor 2 and the motor drive device 3 are sold separately, and the customer buys the two and installs them in a vehicle, a general-purpose drive device is sold. In the embodiment, it is not necessary to pay attention to the combination of the motor 2 and the motor drive device 3, and there is an advantage that the configuration is such that no problem occurs regardless of the orientation.

As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily assume various changes and modifications within the obvious scope by looking at the present specification. Therefore, such changes and modifications should be construed as being within the scope of the invention defined by the claims or within the scope equivalent thereto.

DESCRIPTION OF SYMBOLS 1 ... Electric vehicle 2 ... Motor 3 ... Motor drive device 4 ... Rotation angle sensor 7 ... In-wheel

motor drive device

8, 9 ... Wheel 10 ... ECU
DESCRIPTION OF SYMBOLS 11 ... Rotation angle calculation part 12 ... Control calculating part 13 ... Motor drive part 14 ... Nonvolatile memory | storage device (memory | storage part)
DESCRIPTION OF SYMBOLS 15 ... Motor drive calculating part 16 ... Volatile memory area 17 ... External connection apparatus 18 ... External communication interface 19 ... Constant setting process part 20 ... Storage constant reading part 21 ... Torque instruction | command part P0 ... Electrical angle origin P1 ... Sensor origin (theta) o ... Offset amount

Claims

A motor drive device that drives a motor that is a driving source of an electric vehicle,
A storage unit that stores constants used for controlling the motor, an external communication interface that is releasably connected to an external connection device that can transmit information and can communicate with the external connection device, and a storage unit that stores the constant An electric vehicle having a constant setting processing unit that sets a predetermined constant among the constants, which is a value specific to the individual motor, to a numerical value transmitted from the external connection device via the external communication interface. Motor drive device.
2. The motor driving apparatus for an electric vehicle according to claim 1, wherein the motor includes a rotation angle sensor, and a sensor origin used as a measurement reference of the rotation angle sensor and a control reference point of the motor necessary for controlling the motor. There is an offset amount at a certain electrical angle origin, and the constant setting processing unit includes at least the offset amount as a numerical value transmitted and set from the external connection device.
3. The electric vehicle motor drive device according to claim 2, wherein the storage unit for setting a numerical value by the constant setting processing unit is a non-volatile storage device.
4. The motor drive device for an electric vehicle according to claim 3, wherein the offset amount stored in the nonvolatile storage device is read into a storage area used for motor control in response to power-on of the motor drive device. An electric vehicle motor driving device provided with a constant reading unit.
5. The motor drive device for an electric vehicle according to claim 1, wherein the motor can independently set a positive direction of rotation in any direction, and is attached to a vehicle. The constant setting processing unit includes a value specifying the positive direction of the rotation direction of the motor as a numerical value transmitted and set from the external connection device. .