JP2002291149A - Motor controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discharge a capacitor by detecting a break promptly in case a break of a DC power line, and rotating a motor without generating torque. SOLUTION: This motor controller can achieve the above purpose by including motors 1, 4 which rotate by external force to generate power, and rotate when power is supplied, a capacitor 27 which stores power generated by the motors 1, 4, a battery 15 which is connected by the capacitor 27 and the DC power line and charges discharged power when power in the capacitor 27 is discharged, a break detector 16 which detects the break in the DC power line 28, a power generation determining means 16 which determines whether the motors 1, 4 is generating power or not, and controllers 16, 17 which drive the rotation of the motors 1, 4 without generating the torque thereof, and discharge the power in the capacitor 27 to the motors 1, 4 when the break in the DC power line 28 is detected by the break detector 16 and the power generation of the motors 1, 4 is determined by the power generation determining means 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reduces the voltage applied to high-power components when a power line is disconnected during regenerative power generation by a power generating motor, and quickly reduces the electric power accumulated from the disconnection until the motor stops. The present invention relates to a motor control device for discharging electric power to a motor.

[0002]

2. Description of the Related Art In a conventional hybrid vehicle, a battery is charged by charging a regenerative electric power generated by a motor power generation at the time of deceleration once by a capacitor and discharging the electric power charged by the capacitor to a battery. I am trying to do it. In this case, if a high-voltage electric wire (hereinafter referred to as a high-power DC line) connecting the capacitor and the battery is broken, the power charged in the capacitor cannot be discharged to the battery. Therefore, there is a possibility that the capacitor is broken, so that when the disconnection of the high-power DC line is detected, the power generation of the motor is stopped.

[0003] In the above-described hybrid vehicle, a high-power DC
The detection of line disconnection is performed by a hybrid control module that comprehensively controls the motor and the engine. The hybrid control module is connected to the motor controller via the communication line, and the control of the motor is
Performed by the motor controller.

[0004]

According to the above configuration, the disconnection of the high-power DC line is detected by the hybrid control module, and the disconnection result is transmitted to the motor controller via the communication line. Then, the motor controller performs stop control of the power generation motor. Therefore,
It takes a long time after the disconnection is detected until the motor actually stops. During this time, the electric power generated by the motor is charged in the capacitor, but since there is no path to be discharged to the battery due to disconnection, the capacitor is charged as it is.
That is, there is a possibility that a high voltage is applied to the high-power components including the capacitor.

[0005] It is an object of the present invention to provide a motor control device that discharges a capacitor by rotating a motor without generating torque when a power line breaks during regenerative power generation. is there.

[0006]

FIG. 1 shows an embodiment of the present invention.
The present invention will be described with reference to FIG. (1) A motor control device according to the present invention generates electric power by being rotated by an external force and generates and rotates the motors 1 and 4 to which electric power is supplied, and a capacitor that charges the electric power generated by the motors 1 and 4 27, a capacitor 27 and a power line 28.
When the charged power is discharged, the battery 15 that charges the discharged power, the disconnection detecting device 16 that detects the disconnection of the power line 28, and whether the motors 1 and 4 are generating power are determined. When the disconnection of the power line 28 is detected by the power generation determining means 16 and the disconnection detecting device 16 and the power generation determining means 16 determines the power generation of the motors 1 and 4, the motor is controlled so that the torque of the motors 1 and 4 is not generated. The above object is achieved by providing control devices 16 and 17 for rotating the motors 1 and 4 to discharge the electric power charged in the capacitor 27 to the motors 1 and 4. (2) According to a second aspect of the present invention, in the motor control device of the first aspect, there is provided a voltage rising degree detecting means 16 for detecting a rising degree of the voltage of the capacitor 27. Power generation is determined, and the power line 28
Is detected, and the voltage rise degree detecting means 1
When the rise of the voltage detected by the motor 6 is equal to or higher than a predetermined rise, the motors 1 and 4 are driven to rotate so that the torque of the motors 1 and 4 is not generated, and the electric power charged in the capacitor 27 is It is characterized by discharging to 1,4. (3) The invention according to claim 3 is the motor control device according to claim 1 or 2, wherein the motors 1 and 4 generate electric power by rotating by an external force, and the first motor 1 is supplied with electric power and added. And a second motor 4 to be driven.

In the section of the means for solving the above problems, the present invention is associated with FIG. 1 of the embodiment in order to explain the present invention in an easily understandable manner, but the present invention is limited to the embodiment. Not something.

[0008]

According to the present invention, the following effects can be obtained. (1) According to the first to third aspects of the present invention, when the power generation of the motor is determined and the disconnection of the power line is detected, the motor is rotated so as not to generate the torque of the motor. When driven, the electric power charged in the capacitor is discharged to the motor and consumed, so that the electric power charged in the capacitor can be consumed without generating torque by the motor, and strong electric components such as capacitors Overvoltage can be prevented. (2) According to the second aspect of the present invention, when the power generation of the motor is determined, the disconnection of the power line is detected, and the motor is controlled so that the torque of the motor is not generated when the voltage rise is equal to or higher than the predetermined rise. Is rotated to discharge the electric power that has charged the capacitor to the motor, so that it is possible to reliably prevent an overvoltage from being applied to the high-power component when the wire is disconnected. In other words, when the disconnection of the power line is erroneously detected,
For example, even if it is erroneously detected that the disconnection has occurred even though the disconnection has not occurred, if the voltage increase is smaller than a predetermined increase, it is determined that the disconnection has not occurred, and the electric power charged to the capacitor is determined. As a result, it is possible to reliably prevent an overvoltage from being applied to the high-power component when the wire is disconnected.

[0009]

FIG. 1 is a diagram showing the configuration of an embodiment of a hybrid vehicle equipped with a motor control device according to the present invention. A hybrid vehicle that uses the engine 2 and the drive motor 4 as power sources controls the running of the engine 2 and the drive motor 4 by controlling the disengagement and connection of the clutch 3.
The vehicle travels in one of the following modes: traveling by the engine 2 and traveling by the engine 2 and the driving motor 4. Such a hybrid vehicle further includes the power generation motor 1, a capacitor 27 provided in the inverter 11, the battery 15, the hybrid control module 16, and the motor controller 17.

The power generation motor 1 is connected to the inverter 11, the drive motor 4 is connected to the inverter 12, and the hydraulic drive motor 10 is connected to the inverter 11.
Are connected to the inverters 13, respectively. The inverters 11, 12, and 13 are connected to the main battery 15 via a common high-power DC line 28 and junction boxes 19, 20, and 21. The power generation motor 1 is an AC machine such as a three-phase synchronous motor or a three-phase induction motor mainly used for starting the engine 2 and generating power. The output shaft of the power generating motor 1, the output shaft of the engine 2, and the input shaft of the clutch 3 are connected to each other. When the clutch 3 is engaged, the output of the power generating motor 1 can be used for propulsion and braking of the vehicle. In addition, the generator motor 1 is not limited to an AC machine, but may be a DC motor.

The output shaft of the drive motor 4 is transmitted to a differential gear 7 via a continuously variable transmission 5 and a speed reducer 6 to rotate the wheels 8. The continuously variable transmission 5 is controlled by pressure oil supplied from a hydraulic device 9. Hydraulic device 9
Is provided with a hydraulic pump (not shown) driven by a hydraulic drive motor 10. The drive motor 4 is also used for braking the vehicle. Drive motor 4, hydraulic drive motor 10
Are AC machines such as a three-phase synchronous motor or a three-phase induction motor.

The power generating motor 1, the driving motor 4 and the hydraulic driving motor 10 are connected to inverters 11 and 1, respectively.
It is driven by electric power supplied through the power supply 2 and the power supply 13. That is, the inverters 11, 12, and 13 convert DC charging power of the main battery 15 into AC power and supply the AC power to the power generation motor 1, the drive motor 4, and the hydraulic drive motor 10. When the power generation motor 1 is used as a power generator, the inverter 11 converts the AC power generated by the power generation motor 1 into DC power and charges the main battery 15. As the main battery 15, various batteries such as a lithium-ion battery, a nickel-metal hydride battery, and a lead battery, and an electric double layer capacitor, a so-called power capacitor, can be used. When a DC motor is used as the power generation motor 1, a DC / DC converter is used instead of the inverter 11.

A motor controller (M / C) 17 controls each of the inverters 1, 4, and 10 to control the motors 1, 4, and 10.
1, 12, and 13 are controlled. Engine controller (E
/ C) 18 controls the engine such as the rotation speed and output torque of the engine 2 and the transmission torque of the clutch 3. The motor controller 17 is a hybrid control module (HCM) together with the engine controller 18.
16 is connected.

Hybrid control module 16
Performs control calculations on how the hybrid vehicle runs based on signals from the motor controller 17 and the engine controller 18. Further, based on the calculation results, the engine 2, the motors 1, 4,
The control method 10 is determined, and the control command value is output to the motor controller 17 and the engine controller 18, respectively.

FIG. 2 is a block diagram of the motor control device according to the present invention. In FIG. 1, a power generation motor 1, an engine 2, an inverter 11, and a battery 1
FIG. 5 is a detailed system diagram illustrating a hybrid control module 16, a motor controller 17, a junction box 19, and the like.

Junction box (J / B) 19
Includes a relay switch 23 and a fuse 24. When a current flows through the relay coil 22 by electric power from an auxiliary battery (not shown, for example, 12 V), the relay switch 23 is closed, and electric power from the battery 15 is supplied to the inverter 11. The inverter 11 is covered with an inverter case (not shown). Since a high voltage and a high current flow through the inverter 11, the switch 25 provided in the inverter case is forcibly disconnected when the case is opened. The power generating motor 1 generates power by the rotation of the engine 2, and the generated power drives the fan motor 22 via an inverter (not shown) and charges the capacitor 27 via the inverter 11. The electric power charged in the capacitor 27 is discharged to the battery 15 through the junction box 19, and charges the battery 15.

The voltage from the high-power DC line (power line) 28 is input to the hybrid control module 16. The hybrid control module 16 detects disconnection based on the detected voltage. The disconnection includes disconnection of a harness, disconnection of a fuse, and OFF of a relay. Upon detecting a disconnection failure, the hybrid control module 16 outputs a disconnection failure result to the speaker 30, the display 31, and the motor controller 17. The speaker 30 having received the disconnection failure result notifies the disconnection failure by voice and the display 31 displays the screen.

FIG. 3 is a flowchart showing control by the motor control device according to the present invention. The operation of the embodiment will be described with reference to this flowchart. The following control is performed by the hybrid control module 16.

When the ignition switch is turned on, this control is started. In step S1, electric power is supplied from the auxiliary battery to the relay coil 22. Thereby, the relay switch 23 in the junction box 19 is closed, and the power of the battery 15 can be supplied to the inverter 11.

In step S2, the voltage of the capacitor 27 detected by the voltage sensor 26 is read from the motor controller 17. That is, the motor controller 17 reads the detection signal of the voltage sensor 26 at a predetermined timing and stores it in the memory. Motor controller 1
7 transmits the voltage of the capacitor 27 in the memory to the hybrid control module 16 in response to a request signal from the hybrid control module 16. In step S3, the hybrid control module 16 detects a break in the high-power DC line. If no disconnection is detected, the process returns to step S2, and if a disconnection is detected, the process proceeds to step S4.

In step S4, the motor controller 1
7, the hybrid control module 16 determines whether the fan motor 32 of the air conditioner is rotating. That is, the motor controller 1
7 determines whether to rotate the fan motor 32 based on information from an outside temperature sensor, an inside temperature sensor, an operation switch of an air conditioner, and the like (not shown). Fan motor 32
When it is determined to rotate the motor controller 1
7 rotates the power generation motor 1 to rotate the fan motor 32. At the same time, a signal (power generation signal) indicating that the fan motor 32 is determined to be rotated is transmitted to the hybrid control module 16.
The hybrid control module 16 determines that the power generation motor 1 is generating power by receiving the power generation signal. That is, in step S4, it is determined whether the power generation motor 1 is generating power by determining whether the fan motor 32 is rotating.

If it is determined in step S4 that the fan motor 32 is rotating, the process proceeds to step S5. Step S5
Then, similarly to step S2, the capacitor voltage detected by the voltage sensor 26 is transmitted from the motor controller 17 to the hybrid control module 16 and is read. After transmitting the voltage of the capacitor 27 to the hybrid control module 16, the process proceeds to step S6.

If it is determined in step S4 that the fan motor 32 is not to be rotated, that is,
If it is determined that is not generating power, step S13
Proceed to. In step S13, a conventional stop process is performed.
That is, the hybrid control module 16
Sends a command to the motor controller 17 to stop the inverter 11. The motor controller 17 that has received the command performs a stop process of the inverter 11. afterwards,
In step S <b> 14, the fact that there is a disconnection failure is notified by sound from the speaker 30 or display on the display 31.

In step S6, the voltage of the capacitor 27 detected in step S4 is set to a predetermined value (for example, 380V).
It is determined whether or not this is the case. Disconnect the capacitor 2
7 cannot charge the main battery 15, and the voltage of the capacitor 27 rises. If it is determined that the voltage of the capacitor 27 is equal to or higher than the predetermined value, the process proceeds to step S7.

In step S7, the voltage rise is calculated based on the voltage of the capacitor 27 detected in step S2 and the voltage of the capacitor 27 detected in step S5. That is, the voltage rise of the capacitor 27 before and after the disconnection is calculated. After calculating the voltage rise, the process proceeds to step S8. In step S8, the capacitor 2 calculated in step S7
Then, it is determined whether or not the voltage rise of 7 is not less than a threshold value (for example, 2.5 V / msec). At the time of disconnection, the voltage rise of the capacitor 27 becomes larger than that at the time of non-disconnection. Therefore, by calculating the voltage rise, it is possible to estimate that an overvoltage is applied to the capacitor 27. If it is determined that the degree of voltage rise is equal to or greater than the threshold value, the process proceeds to step S9.

It should be noted that the judgment of step S6 or step S8 is negative (NO) when disconnection is detected but the voltage of the capacitor 27 has not risen to a predetermined value or more.
Or when the degree of voltage rise is low. These are caused by erroneous detection of the disconnection itself. That is, instead of reducing the cost of the disconnection detection circuit (not shown) and lowering the accuracy, erroneous detection of disconnection is detected in steps S6 and S8. In step S8, the magnitude of the voltage rise and the threshold are determined twice, and if the voltage rise is twice the threshold, the process may proceed to step S9.

In step S9, the motor controller 1 is operated so that the power generation motor 1 is operated at the torque T = 0 Nm.
7, a signal of the torque command value T is output. The motor controller 17 having received the signal performs control so that the torque T of the power generation motor 1 becomes 0 Nm. As a result, the power generation motor 1 stops generating power and rotates by the current flowing through the inverter 11 using the capacitor 27 as a power supply. However, no torque is generated because the torque command value T is 0 Nm. That is, the electric power stored in the capacitor can be quickly discharged without generating unnecessary driving torque. The torque command value T may be larger than 0 Nm as long as the behavior of the vehicle due to the driving of the power generation motor 1 by the torque command value T does not occur.

In the following step S10, the capacitor voltage detected by the voltage sensor 26 is read from the motor controller 17 in the same manner as in step S5 described above. In step S11, the voltage of the capacitor 27 read in step S10 is changed to a predetermined threshold value (for example, 350 V).
It is determined whether or not: That is, step S9
To discharge the electric power stored in the capacitor 27, and it is determined whether or not the voltage after the discharge becomes equal to or lower than a predetermined threshold value. Here, the threshold value is a value different from the predetermined value in step S6. If it is determined that the difference is equal to or smaller than the threshold, the process proceeds to step S12. If it is determined that the voltage is larger than the threshold value, the process returns to step S9, and the voltage of the capacitor
Steps S9 to S11 are repeated until the value becomes equal to or less than the predetermined threshold value determined in step S1.

In step S12, the fact that the disconnection fault is occurring is notified by voice through the speaker 30 or displayed on the display 31 to notify the user.

In the overvoltage prevention control of the hybrid vehicle according to such a processing procedure, after detecting the disconnection of the high-power DC line (step S3), it is detected whether or not the power generation motor 1 is generating power (step S4). If not,
After the stop processing of the inverter 11 is performed, it is notified that a disconnection fault has occurred (steps S13 to S1).
4). If it is during power generation, after estimating that an overvoltage is applied to the capacitor 27 (steps S5 to S8),
Discharging is performed until the voltage of the capacitor 27 becomes equal to or lower than a predetermined threshold while controlling the power generation motor 1 to stop generating power and rotate at a torque of 0 Nm (steps S9 to S11). Thereafter, the disconnection failure is notified (step S12). Therefore, according to the motor control device of this embodiment, when the power generation motor 1 is generating power and a disconnection of the high-power DC line (power line) 28 connecting the capacitor 27 and the main battery 15 is detected. Since the electric power charged in the capacitor 27 is consumed by driving the power generation motor 1, it is possible to prevent an overvoltage from being applied to the high-power components such as the capacitor 27.

When driving the power generating motor 1,
Since the generator motor 1 is driven at 0 Nm or at a torque that does not cause the vehicle to behave, the occupant does not feel uncomfortable. Further, the rise of the voltage of the capacitor 27 is calculated, and when it is determined that the rise is equal to or more than the threshold value, it is estimated that an overvoltage is applied to the capacitor 27, so that the capacitor 27 is quickly charged. The generated electric power can be discharged by the power generation motor 1. The power generation motor 1 is generating power, and the
Even if the disconnection of the high-voltage DC line 28 is detected, if the voltage rise of the capacitor 27 is smaller than the threshold value, it is determined that the detection of the disconnection of the high-power DC line 28 is an erroneous detection, and the power generation motor 1 is not driven. The DC line 28
Can be a low-precision circuit, and even if a cheap disconnection detection circuit is used, the disconnection of the high-power DC line 28 can be detected reliably.

The present invention is not limited to the above embodiment. For example, the electric power generated by the power generation motor 1 is consumed not only by the fan motor of the air conditioner but also by other loads. That is, by detecting power consumption at another load, it can be determined whether or not the power generation motor 1 is generating power. Further, in order to discharge the capacitor 27, the discharge may be performed using a motor other than the power generation motor 1. That is, the operation of the power generation motor 1 during power generation after the disconnection is detected may be stopped, and the drive motor 4 may be rotated without generating torque to discharge the capacitor 27.

In the above-described embodiment, a hybrid vehicle has been described as an example. However, the present invention can be applied to an electric vehicle that does not use an engine. In this case, when the power line is disconnected during power generation of the motor due to braking of the vehicle or the like, the power charged in the capacitor may be driven so that the motor does not generate torque. Further, in the above-described embodiment, a hybrid vehicle has been described as an example, but the invention is not limited to a vehicle as long as the invention can be applied.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a motor control device according to the present invention;

FIG. 2 is a diagram showing a system configuration of an embodiment of a motor control device according to the present invention;

FIG. 3 is a flowchart showing a control procedure of a motor control device according to the present invention.

[Explanation of symbols]

1 ... motor for power generation, 2 ... engine, 3 ... clutch, 4 ...
Driving motor, 10 ... Hydraulic driving motor, 11, 12,
13: inverter, 15: battery, 16: hybrid control module, 17: motor controller, 18: engine control module, 19, 2
0, 21 ... junction box, 22 ... relay coil, 23 ... relay, 24 ... fuse, 25 ... switch,
26: voltage sensor, 27: capacitor, 28: strong DC
Line, 30 ... speaker, 31 ... display, 32 ...
Fan motor

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02M 7/48 H02M 7/48 M 7/797 7/797 F-term (Reference) 5G003 AA07 BA01 DA07 FA04 FA06 GB06 5G044 AC09 AD01 CA05 CE03 5H007 AA17 BB01 BB06 CA01 CB05 CC01 DB01 FA12 5H115 PA08 PG04 PI13 PI29 PU08 PU21 PV09 QE20 QN02 SE10 TO13 TR14 TU05

Claims (3)

[Claims] 1. A motor that generates electric power by being rotated by an external force and that is supplied with electric power and is driven to rotate, a capacitor that charges electric power generated by the motor, and a capacitor that is connected to the capacitor by a power line. A battery that charges the discharged power when the power charged in the capacitor is discharged; a disconnection detection device that detects disconnection of the power line; and a power generation that determines whether the motor is generating power. Determining means, when the disconnection of the power line is detected by the disconnection detecting device, and when the power generation of the motor is determined by the power generation determining means, the motor is rotationally driven so that torque of the motor is not generated. And a control device for discharging the electric power charged in the capacitor to the motor. Location. 2. The motor control device according to claim 1, further comprising a voltage increase detection unit that detects an increase in the voltage of the capacitor, wherein the control device is configured to determine whether the power generation of the motor has been performed. And when the disconnection of the power line is detected, and when the increase in the voltage detected by the voltage increase detection unit is equal to or higher than a predetermined increase, the motor is controlled so that the torque of the motor is not generated. A motor control device for driving the motor to discharge the electric power charged in the capacitor to the motor. 3. The motor control device according to claim 1, wherein the motor is a first motor that generates electric power by rotating by an external force, and a second motor that is supplied with electric power and driven to rotate. A motor control device comprising: