JP2016174447A - Motor drive unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor drive unit capable of detecting the connection abnormality with the rotation sensor of a motor, without energizing the motor.SOLUTION: A motor drive unit 10 includes a control section 12 having two FB terminals for connection, respectively, with two output terminals of the rotation sensor 6 of a motor 5, and controlling an inverter 11 based on two signals from the rotation sensor 6. The control section 12 is pre-storing two normal signals of the rotation sensor 6 when the motor 5 is rotated in a predetermined direction, and in a state where a DC power is supplied to a power supply terminal, but not supplied to the input terminal of the inverter 11, judges connection abnormality of two FB terminals and two output terminals of the rotation sensor 6, based on two signals from the rotation sensor 6 supplied, respectively, to the two FB terminals when the motor 5 is rotated in a predetermined direction, and two pre-stored normal signals of the rotation sensor 6.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a motor drive device that drives a motor for driving a vehicle.

  A hybrid vehicle, an electric vehicle, and the like are equipped with a motor for driving the vehicle and a motor driving device for driving the motor. The motor drive device includes a three-phase inverter that converts DC power from the battery into three-phase AC power and supplies the three-phase motor to the three-phase motor, and a control unit that controls the drive of the motor by controlling the inverter. The control unit includes shift information (forward / reverse of the vehicle, that is, forward / reverse rotation of the motor), accelerator information (target speed of the vehicle, that is, target rotational speed of the motor), DC input power / AC output power of the inverter, and Motor drive control is performed based on the motor rotation speed (rotation speed) from the motor rotation sensor. Patent Document 1 describes this type of motor drive device.

  In addition, Patent Document 1 aims at detecting an abnormal mounting of a rotation sensor with respect to a motor (a shift in the mounting angle of the rotation sensor due to a mounting error during manufacture or looseness during use (during vehicle travel)). Set the current command value of the AC waveform for abnormality detection when is running stopped, and attach the rotation sensor when the detection value from the rotation sensor is equal to or greater than the set abnormality detection threshold Detect anomalies.

JP 2006-129636 A

  As a rotation sensor in a motor for driving a vehicle, there are an electromagnetic or optical encoder, an electromagnetic resolver, and the like. This type of rotation sensor is used for outputting two signals of an A phase signal and a B phase signal. There are two signal output lines. When the two signal output lines of the rotation sensor are connected to the motor drive device, there is a possibility that a connection abnormality occurs in which the connection is reversed or the connection is not complete.

  When a general-purpose vehicle driving motor and a motor driving device are applied to various vehicles (for example, EVs obtained by modifying engine vehicles), there are naturally cases in which the motor rotation direction and the forward / reverse direction are reversed depending on the vehicle type. There is a risk of reverse connection, especially in small-volume production or handmade. For example, when the motor is connected to the motor in the reverse direction, if the motor is energized by the motor driving device, the forward and backward movement of the vehicle will be opposite to the intended direction, so that the motor driving device and the motor rotate without energizing the motor. I want to detect a connection error with a sensor.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a motor drive device that can detect an abnormality in connection with a rotation sensor of a motor without energizing the motor.

  The motor driving device of the present invention is a device for driving a motor for driving a vehicle, and converts the DC power supplied to the input terminal into AC power and supplies the AC power to the motor connected to the output terminal. A rotation sensor which has a power supply terminal to which DC power is supplied and two feedback terminals connected to two signal output terminals of the rotation sensor mounted on the motor, respectively, and is supplied to the two feedback terminals, respectively. And a control unit that controls the drive of the motor by controlling the inverter based on the two signals according to the number of rotations of the motor, and the control unit moves the motor in a predetermined direction. Two normal signals from the rotation sensor when rotating are stored in advance, DC power is supplied to the power supply terminal, and DC power is supplied to the input terminal of the inverter. The two feedback terminals and the rotation sensor are connected to each other based on the two signals from the rotation sensors respectively supplied to the two feedback terminals and the two normal signals stored in advance when the motor is rotated in a predetermined direction. A connection abnormality between the two signal output terminals is determined.

  According to this motor drive device, when DC power is not supplied to the input terminal of the inverter, that is, when the motor is not energized by the inverter, the motor is rotated in a predetermined direction, and the motor is rotated in this predetermined direction. Detection of abnormal connection (for example, reverse connection or incomplete connection) between the two feedback terminals of the control unit and the two signal output terminals of the rotation sensor based on two normal signals from the rotation sensor stored in advance. it can.

  When the two signals from the rotation sensors respectively supplied to the two feedback terminals do not coincide with the two normal signals stored in advance, the control unit described above includes two feedback terminals and two signal output terminals of the rotation sensor. It may be determined that the connection is abnormal.

  Further, the predetermined direction described above may be a forward rotation direction of a motor for moving the vehicle forward or a reverse rotation direction of a motor for moving the vehicle backward.

  In addition, the motor drive device described above may further include a notification unit that notifies when the control unit determines that the connection is abnormal.

  Further, the notification unit described above may be a notification sound generator for vehicle backward notification.

  In addition, the above-described control unit previously stores two normal signals from the rotation sensor when the motor is rotated in the forward rotation direction and two normal signals from the rotation sensor when the motor is rotated in the reverse rotation direction. The two normal signals corresponding to the corresponding rotation direction of the forward rotation direction and the reverse rotation direction are selected in accordance with the shift information for the forward or reverse movement of the vehicle, and the motor is set to the corresponding rotation direction. Based on the two signals from the rotation sensor respectively supplied to the two feedback terminals and the two selected normal signals when rotating, an abnormal connection between the two feedback terminals and the two signal output terminals of the rotation sensor is detected. You may judge.

  According to the present invention, it is possible to detect an abnormal connection between the motor drive device and the rotation sensor of the motor without energizing the motor.

It is a figure which shows the main structure of the vehicle which concerns on 1st Embodiment, and the structure of the motor drive device which concerns on the 1st Embodiment of this invention. (A) A normal output signal of the rotation sensor when the vehicle is moved forward, that is, when the motor is rotated in the forward rotation direction, and (b) When the vehicle is moved backward, that is, the motor is rotated in the reverse rotation direction. It is a figure which shows the normal output signal of a rotation sensor at the time. It is a figure which shows the main structures of the vehicle which concerns on 2nd Embodiment, and the structure of the motor drive device which concerns on the 2nd Embodiment of this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.
[First Embodiment]

  FIG. 1 is a diagram illustrating a main configuration of a vehicle according to the first embodiment and a configuration of a motor drive device according to the first embodiment of the present invention. The vehicle 1 is a hybrid vehicle, an electric vehicle, or the like, and includes a battery 2, a main switch 3, a key switch 4, a motor driving device 10, a motor 5, a rotation sensor (rotational speed sensor) 6, and a transmission 7. And wheels 8. The motor drive device 10 includes an inverter 11, a control unit 12, and a notification unit 13.

  In the vehicle 1, when the main switch 3 is turned on after the key switch 4 is turned on by a user operation, the motor 5 is driven by the motor driving device 10 and the wheels 8 are driven via the transmission 7.

The input terminal 11 _I of the inverter 11 in the motor drive device 10 is connected to the battery 2 via the main switch 3, and the output terminals 11 _OU , 11 _OV , 11 _OW of the inverter 11 are connected to the motor 5. . A control signal from the control unit 12 is input to the control terminal 11 _C of the inverter 11. The inverter 11 is a three-phase inverter constituted by six switching elements, and converts DC power from the battery 2 supplied to the input terminal 11 _I through the main switch 3 into three-phase AC power. The phase AC power is supplied to the motor 5 connected to the output terminals 11 _OU , 11 _OV , 11 _OW .

Here, the motor 5 is a three-phase motor, and a rotation sensor 6 that detects the number of rotations (rotational speed) of the motor 5 is attached to the motor 5. The rotation sensor 6 is an electromagnetic or optical encoder, an electromagnetic resolver, or the like, and has two signal output terminals 6 _OA and 6 _OB that output two signals of an A phase signal and a B phase signal, respectively. These signal output terminals 6 _OA and 6 _OB are connected to two signal output lines 6 _A and 6 _B for connection to the control unit 12 in the motor drive device 10, respectively.

The power supply terminal 12 _VCC of the control unit 12 is connected to the battery 2 via the key switch 4, and the first output terminal 12 _O1 of the control unit 12 is connected to the control terminal 11 _C of the inverter 11, The second output terminal 12 _O2 of the control unit 12 is connected to the notification unit 13. Further, shift information corresponding to a vehicle shift operation by the user is input to the first input terminal 12 _I1 of the control unit 12, and the accelerator of the vehicle by the user is input to the second input terminal 12 _I2 of the control unit 12. Accelerator information corresponding to the operation is input. Information corresponding to the output power of the inverter 11 is input to the first feedback terminal 12 _FB1 of the control unit 12. The second and third feedback terminals 12 _FB2 and 12 _FB3 of the control unit 12 are connected to the two signal output lines 6 _A and 6 _{B of} the rotation sensor 6, that is, the two signal output terminals 6 _OA and 6 _OB , respectively. Has been.

  The control unit 12 includes shift information (forward / reverse movement of the vehicle, that is, forward / reverse rotation of the motor), accelerator information (target speed of the vehicle, that is, target rotational speed of the motor), DC input power / AC output power of the inverter 11, And based on the A phase signal and B phase signal from the rotation sensor 6 of the motor 5, the control signal for driving the switching element for each phase in the inverter 11 is produced | generated.

In addition, the control unit 12 includes the second and third feedback terminals 12 _FB2 and 12 _FB3 and the two signal output lines 6 _A and 6 _{B of} the rotation sensor 6, that is, the two signal output terminals 6 _OA and 6 _OB . Implement an abnormality detection program that detects connection errors.

  In the abnormality detection program, for example, as shown in FIG. 2A, when the vehicle 1 is moved forward or only the wheels are rotated in the forward direction, that is, the normal A of the rotation sensor 6 when the motor 5 is rotated forward. A phase signal and a B phase signal are set. The control unit 12 loads the abnormality detection program, and as shown in FIG. 2A, the normal A phase signal and B phase signal of the rotation sensor 6 when the motor 5 is rotated in the forward rotation direction. Is stored in advance.

  Here, the abnormality detection program is executed when the key switch 4 is in the on state and the main switch 3 is in the off state. In other words, the abnormality detection program can be executed in a state where DC power is supplied to the control unit 12 and DC power is not supplied to the inverter 11, that is, in a state where the motor 11 is not energized. The point is a major feature.

In this state, by rotating the wheel 8 of the vehicle 1 in the forward direction using human power or external power (a roller or the like that is separately controlled), the motor 5 can respond to the normal signal of the rotation sensor 6 stored in advance. Rotates in the forward direction. At this time, the control unit 12 sends the A phase signal and the B phase signal from the rotation sensor 6 input to the second and third feedback terminals 12 _FB2 and 12 _FB3 , and the normal A of the rotation sensor 6 stored in advance. The phase signal and the B phase signal (FIG. 2A) are compared, and when the phase relationship between the A phase signal and the B phase signal does not match, the second and third feedback terminals 12 _FB2 and 12 _FB3 Then, it is determined that the connection between the two signal output lines 6 _A and 6 _{B of} the rotation sensor 6, that is, the two signal output terminals 6 _OA and 6 _OB is abnormal.

The notification unit 13 is controlled by the control unit 12 using the second and third feedback terminals 12 _FB2 and 12 _FB3 and the two signal output lines 6 _A and 6 _{B of} the rotation sensor 6, that is, the two signal output terminals 6 _OA and 6 _OB. When it is determined that the connection with is abnormal, a notification is performed. Examples of the notification unit 13 include a buzzer that performs notification by sound, a display lamp that performs notification by display such as LED lighting, and a communication device that performs notification by data. In the case of a buzzer, a notification sound generator for vehicle back notification can be used, and in the case of a communication device, a maintenance CAN communication device can be used.

Thus, according to the motor drive device 10 of the first embodiment, the main switch 3 is in the off state, in other words, the DC power is not supplied to the input terminal 11 _I of the inverter 11, that is, the motor 5 is energized. On the basis of the normal A-phase signal and B-phase signal of the rotation sensor 6 stored in advance when the motor 5 is rotated in the forward rotation direction and the motor 5 is rotated in the forward rotation direction. Of the second and third feedback terminals 12 _FB2 and 12 _FB3 and the two signal output lines 6 _A and 6 _{B of} the rotation sensor 6, that is, the two signal output terminals 6 _OA and 6 _OB (for example, reverse) Connection or incomplete connection) can be detected.

Further, according to the motor drive device 10 of the first embodiment, it is possible to detect the coincidence / mismatch between the rotation direction of the motor 5 by the transmission 7 and the rotation direction of the wheels 8 (the forward / backward direction of the vehicle 1). it can.
[Second Embodiment]

  FIG. 3 is a diagram illustrating a main configuration of a vehicle according to the second embodiment and a configuration of a motor drive device according to the second embodiment of the present invention. A vehicle 1A shown in FIG. 3 is different from the first embodiment in that the vehicle 1 shown in FIG. 1 includes a motor drive device 10A instead of the motor drive device 10 and further includes a roller 20 that rotates the wheels 8. As a result, the motor drive device 10A can automate the detection of connection abnormality with the rotation sensor 6 of the motor 5.

The motor drive device 10A is different from the first embodiment in that the motor drive device 10 includes a control unit 12A instead of the control unit 12. In the control unit 12, the control unit 12 _{</ b> A has} third and fourth output terminals 12 _O3 and 12 _O4 connected to the main switch 3 and the key switch 4, and a fifth output terminal 12 _O5 connected to the roller 20. Is different from the control unit 12 in that

Controller 12A, the second and third feedback terminals _{12 FB2, 12 FB3,} the two signal output lines ₆ A rotation sensor 6, _{6 B,} namely two signal output terminals _{6 OA,} connection between _{6 OB} abnormal Implement an automatic anomaly detection program that automatically detects

  In the automatic abnormality detection program, for example, as shown in FIG. 2A, the normal A phase signal and B phase signal of the rotation sensor 6 when the vehicle 1 is moved forward, that is, when the motor 5 is rotated forward. In addition, as shown in FIG. 2B, normal A-phase signal and B-phase signal of the rotation sensor 6 when the vehicle 1 is moved backward, that is, when the motor 5 is reversed are set. The control unit 12A executes the automatic abnormality detection program so that the normal A phase signal and B phase of the rotation sensor 6 when the motor 5 is rotated in the forward rotation direction as shown in FIG. In addition to the signals, as shown in FIG. 2B, normal A-phase signals and B-phase signals of the rotation sensor 6 when the motor 5 is rotated in the reverse direction are stored in advance.

  First, the control unit 12A sets the rotation direction corresponding to the forward rotation direction or the reverse rotation direction of the motor 5 according to shift information (forward / reverse movement of the vehicle, that is, forward / reverse rotation of the motor) supplied from the outside. The normal A phase signal and B phase signal of the corresponding rotation sensor 6 are selected. In the following, a normal A-phase signal of the rotation sensor 6 when the vehicle 1 is moved forward, that is, when the motor 5 is rotated in the forward rotation direction, according to the shift information (forward movement of the vehicle, that is, forward rotation of the motor). The case of selecting the B phase signal will be described.

Next, the control unit 12A turns on the key switch 4 by a command output from the fourth output terminal 12 _O4 and turns off the main switch 3 by a command output from the third output terminal 12 _O3. And As a result, DC power is supplied to the control unit 12 and DC power is not supplied to the inverter 11, that is, the motor 5 is not energized from the inverter 11.

Next, the control unit 12A controls the roller 20 according to a command output from the fifth output terminal _1205, and rotates the wheel 8 of the vehicle 1 in the forward direction, so that the motor 5 is controlled in accordance with the shift information. Rotate in the rolling direction. At this time, the control unit 12A controls the A and B phase signals from the rotation sensor 6 input to the second and third feedback terminals 12 _FB2 and 12 _FB3 and the rotation sensor corresponding to the selected normal rotation direction. 6 normal A-phase signal and B-phase signal (FIG. 2A), and when the phase relationship between the A-phase signal and the B-phase signal does not match, the second and third feedback terminals It is determined that the connection between 12 _FB2 and 12 _FB3 and the two signal output lines 6 _A and 6 _{B of} the rotation sensor 6, that is, the two signal output terminals 6 _OA and 6 _OB is abnormal.

  The motor driving device 10A of the second embodiment can obtain the same advantages as the motor driving device 10 of the first embodiment.

The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the first embodiment, the abnormality detection program includes a normal phase A of the rotation sensor 6 when the vehicle 1 is moved backward, that is, when the motor 5 is reversed, as shown in FIG. A signal and a B phase signal may be set. That is, as shown in FIG. 2B, the control unit 12 may store in advance the normal A phase signal and B phase signal of the rotation sensor 6 when the motor 5 is rotated in the reverse direction. In this case, by rotating the wheel 8 of the vehicle 1 in the reverse direction, the motor 5 is rotated in the reverse rotation direction corresponding to the normal signal of the rotation sensor 6 stored in advance, and the control unit 12 performs the second and third operations. A phase signal and a B phase signal from the rotation sensor 6 input to the feedback terminals 12 _FB2 and 12 _FB3 and a normal A phase signal and a B phase signal of the rotation sensor 6 stored in advance (FIG. 2B). Based on this, the connection abnormality between the second and third feedback terminals 12 _FB2 and 12 _FB3 and the two signal output lines 6 _A and 6 _{B of} the rotation sensor 6, that is, the two signal output terminals 6 _OA and 6 _OB is determined. May be.

In the first and second embodiments, the connection abnormality is determined by rotating the motor 5 in the rotation direction corresponding to the normal signal of the rotation sensor 6 stored in advance or the normal signal of the selected rotation sensor 6. Alternatively, the abnormal connection may be determined by rotating the motor 5 in a direction opposite to the rotation direction corresponding to the normal signal of the rotation sensor 6 stored in advance or the normal signal of the selected rotation sensor 6. In this case, the control units 12 and 12A, the A phase signal and the B phase signal from the rotation sensor 6 input to the second and third feedback terminals 12 _FB2 and 12 _FB3 , and the rotation sensor 6 stored or selected in advance. When the phase relationship between the A phase signal and the B phase signal is the same, the second and third feedback terminals 12 _FB2 and 12 _FB3 are rotated. It may be determined that the connection between the two signal output lines 6 _A and 6 _{B of} the sensor 6, that is, the two signal output terminals 6 _OA and 6 _OB is abnormal (for example, reverse connection).

  Further, in the above embodiment, when the direction of the wheel 8 that is turned for abnormality detection is the forward direction and the normal A-phase signal and B-phase signal to be compared are forward direction signals, the notification unit 13 is used for vehicle back notification. The notification sound generator may be used. In this case, since there is a relationship that a notification sound generator for back notification sounds when an abnormality, that is, when the A-phase signal and the B-phase signal in the reverse direction are input to the control units 12 and 12A, The relationship is the same and the control can be simplified.

1, 1A ... vehicle, 2 ... battery, 3 ... main switch, 4 ... key switch, 5 ... motor, 6 ... rotation _{sensor, 6} OA, 6 _{OB ...} signal output terminal, _{6 A,} 6 B _... signal output line, 7 ... transmission, 8 ... wheel, 10, 10A ... motor driving apparatus, 11 ... inverter, 11 I _... input _terminal, 11 _{OU, 11} OV, 11 _{OW ...} output terminal, 11 C _... control terminal, 12, 12A ... control unit, 12 _VCC ... power supply terminal, 12 _I1 , 12 _I2 ... first and second input terminals, 12 _O1 , 12 _O2 , 12 _O3 , 12 _O4 , 12 _O5 ... first to fifth output terminals, 12 _FB1 , 12 _FB2 , 12 _FB3 ... 1st to 3rd feedback terminals, 13 ... notification section, 20 ... rollers.

Claims (6)

An apparatus for driving a motor for driving a vehicle,
An inverter that converts the DC power supplied to the input terminal to AC power and supplies the AC power to the motor connected to the output terminal;
The power supply terminal to which direct current power is supplied and the two feedback terminals connected to the two signal output terminals of the rotation sensor mounted on the motor, respectively, and the rotation supplied to the two feedback terminals, respectively. A control unit that performs drive control of the motor by controlling the inverter based on the two signals according to the number of rotations of the motor, which are two signals from the sensor;
The control unit includes:
Two normal signals from the rotation sensor when the motor is rotated in a predetermined direction are stored in advance,
The rotations respectively supplied to the two feedback terminals when the motor is rotated in the predetermined direction with DC power supplied to the power supply terminal and no DC power supplied to the input terminal of the inverter. Based on two signals from the sensor and the two normal signals stored in advance, a connection abnormality between the two feedback terminals and the two signal output terminals of the rotation sensor is determined.
Motor drive device.   When the two signals from the rotation sensor respectively supplied to the two feedback terminals do not coincide with the two normal signals stored in advance, the control unit is configured to output the two feedback terminals and the two of the rotation sensors. The motor driving device according to claim 1, wherein the connection with the two signal output terminals is determined to be abnormal.   The motor driving device according to claim 1, wherein the predetermined direction is a forward rotation direction of the motor for moving the vehicle forward or a reverse rotation direction of the motor for moving the vehicle backward.   The motor drive device according to claim 1, further comprising a notification unit that notifies when the control unit determines that the connection is abnormal.   The motor driving device according to claim 4, wherein the notification unit is a notification sound generator for vehicle reverse notification. The controller is
Two normal signals from the rotation sensor when the motor is rotated in the forward direction and two normal signals from the rotation sensor when the motor is rotated in the reverse direction are stored in advance. And
According to the shift information for forward or reverse of the vehicle, two normal signals corresponding to the corresponding rotational direction of the forward direction and the reverse direction are selected,
Based on the two signals from the rotation sensor and the two selected normal signals respectively supplied to the two feedback terminals when the motor rotates in the corresponding rotation direction, the two feedback terminals Determining a connection abnormality with the two signal output terminals of the rotation sensor;
The motor drive device according to claim 3.

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