JP2011239495A - Power supply device and control method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device and a control method for the same that prevent power that charges a secondary battery from exceeding an input limit of the power.SOLUTION: When a determining power value Pj that is the sum of motor power values Pm1 and Pm2 consumed or generated in motors MG1 and MG2 and capacitor power values Pc to charge and discharge a high voltage system smoothing capacitor is less than a value obtained by adding a margin α1 to an input limit Win of a high voltage battery, and a high voltage system voltage VH is less than a value obtained by subtracting a margin β from a maximum boostable voltage Vmax, a targeted voltage command value VH* of a high voltage system power line is corrected to the maximum boostable voltage Vmax (S130 to S160). A high voltage system smoothing capacitor 65 is charged by increasing the high voltage system voltage VH to the maximum boostable voltage Vmax, whereby, by increasing the determining power value Pj (decreasing its absolute value), power that charges the high voltage battery can be prevented from exceeding the input limit Win.

Description

  The present invention relates to a power supply device and a control method therefor, and more particularly to a power supply device that exchanges power with a drive device including at least one electric motor that inputs and outputs power, and a control method for such a power supply device.

  Conventionally, as this type of power supply device, in a device including a boost converter that boosts and supplies a voltage from a battery to an inverter circuit that drives a motor for driving a vehicle, the torque of the motor increases as the motor speed increases. There has been proposed one that controls a boost converter using a voltage command in which a voltage applied to an inverter circuit increases as the command increases (see, for example, Patent Document 1). In this device, when the drive wheel slips due to idling, the motor torque command is reduced to prevent an excessive current from flowing through the motor. At this time, an action is applied to the inverter circuit as the motor torque command is reduced. The boost converter is controlled by a voltage command that lowers the voltage to be generated.

JP 2007-282357 A

  In the above-described power supply device, the power for charging the battery may exceed the input limit as the maximum power that may charge the battery. For example, when gripping is performed after slipping due to idling of driving wheels, the motor generates power and the battery is charged by this generated power. The generated power will exceed the battery input limit. In addition, in order to control the motor efficiently, when the motor speed increases, the inverter circuit control is sequentially changed from sine wave control to overmodulation control and rectangular wave control. If the motor speed decreases sharply when switching from overmodulation control to overmodulation control or switching from overmodulation control to sine wave control, the rotational fluctuation force becomes steep with respect to the control cycle or communication cycle, resulting in a large disturbance in the power balance. As a result, the charging power of the battery exceeds the input limit.

  The main purpose of the power supply device and the control method thereof of the present invention is to suppress the power for charging the secondary battery from exceeding the input limit.

  The power supply apparatus and the control method thereof according to the present invention employ the following means in order to achieve the main object described above.

The power supply device of the present invention is
A power supply device that exchanges power with a drive device including at least one electric motor that inputs and outputs power,
A secondary battery,
The battery voltage system connected to the battery voltage system to which the secondary battery is connected and the drive voltage system to which the driving device is connected to adjust the voltage of the drive voltage system to a voltage higher than the voltage of the battery voltage system and the battery voltage A boost converter for exchanging power between a system and the drive voltage system;
A smoothing capacitor for smoothing the voltage of the drive voltage system;
Input limit setting means for setting an input limit as the maximum power that may be charged to the secondary battery based on the state of the secondary battery;
Limit excess prediction state determination means for determining a limit excess prediction state in which charging power for charging the secondary battery is likely to exceed the set input limit;
Control means for controlling the boost converter so that the voltage of the drive voltage system becomes high when the limit excess prediction state is determined;
It is a summary to provide.

  In the power supply device of the present invention, when the limit excess prediction state is determined in which the charging power for charging the secondary battery is likely to exceed the input limit as the maximum power that may charge the secondary battery, the driving is performed. The boost converter is controlled so that the voltage of the drive voltage system to which the device is connected is increased. When the voltage of the drive voltage system is increased, power is consumed by the smoothing capacitor that smoothes the voltage of the drive voltage system, so that the charge power for charging the secondary battery can be reduced by that amount. it can. Thereby, it can suppress that the electric power which charges a secondary battery exceeds the input restriction | limiting.

  In such a power supply apparatus of the present invention, the control means controls the boost converter so that the voltage of the drive voltage system becomes the maximum voltage allowed for the drive voltage system when the limit excess prediction state is determined. It can also be a means. In this way, the power consumed by the smoothing capacitor can be increased, so the charging power for charging the secondary battery is reduced by that amount and the power for charging the secondary battery is prevented from exceeding its input limit. can do.

  Further, in the power supply device of the present invention, the control means has a difference between a voltage of the driving voltage system and a maximum voltage allowed for the driving voltage system equal to or greater than a predetermined voltage when the limit excess prediction state is determined. Sometimes, it may be a means for controlling the boost converter so that the voltage of the drive voltage system becomes high. In this way, the boost converter can be controlled so that the voltage of the drive voltage system is increased only when the power consumed by the smoothing capacitor is expected to some extent and there is an effect of reducing the power for charging the secondary battery. As a result, unnecessary control can be avoided.

  Further, in the power supply device of the present invention, the control means controls the boost converter so that the voltage of the drive voltage system becomes a voltage according to the request of the drive device when the limit excess prediction state is not determined. It can also be a means to do.

  Further, in the power supply device according to the present invention, the over-limit prediction state determining means may exceed the over-limit when charging power for charging the secondary battery reaches within a first margin range from the set input limit. It can also be a means for determining that it is in a predicted state, and it is stored in the smoothing capacitor or discharged from the smoothing capacitor due to the drive-induced power consumed or generated by the driving device and the voltage change of the driving voltage system. It is also possible to determine that the limit excess prediction state is reached when the sum of the power derived from the capacitor-derived power reaches the second margin range from the set input limit.

The control method of the power supply device of the present invention is as follows:
The voltage of the drive voltage system is connected to a drive voltage system to which a secondary battery and a drive device including at least one electric motor that inputs and outputs power are connected and a battery voltage system to which the secondary battery is connected. A power supply comprising: a step-up converter that adjusts a voltage equal to or higher than a voltage of the battery voltage system and exchanges power between the battery voltage system and the drive voltage system; and a smoothing capacitor that smoothes the voltage of the drive voltage system An apparatus control method comprising:
When it is determined that the limit excess prediction state in which the charging power for charging the secondary battery is likely to exceed the input limit as the maximum power that may charge the secondary battery, the voltage of the drive voltage system is high. Controlling the boost converter to
It is characterized by that.

  In the control method of the power supply device of the present invention, the limit excess prediction state in which the charging power for charging the secondary battery is likely to exceed the input limit as the maximum power that may charge the secondary battery is determined. Sometimes, the boost converter is controlled so that the voltage of the drive voltage system to which the drive device is connected increases. When the voltage of the drive voltage system is increased, power is consumed by the smoothing capacitor that smoothes the voltage of the drive voltage system, so that the charge power for charging the secondary battery can be reduced by that amount. it can. Thereby, it can suppress that the electric power which charges a secondary battery exceeds the input restriction | limiting.

1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 equipped with a power supply device as one embodiment of the present invention. 3 is a configuration diagram illustrating an example of a configuration of a boost converter 60. FIG. It is a flowchart which shows an example of the target voltage correction routine for the input restriction | limiting avoidance performed by the hybrid electronic control unit 70 of an Example. It is explanatory drawing which shows an example of the time change of the electric power for judgment Pj when the target voltage command VH * is corrected, and the high voltage system voltage VH. It is a flowchart which shows an example of the target voltage correction routine for the input restriction avoidance of a modification. It is a block diagram which shows the outline of a structure of the electric vehicle 120 as a modification.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of the configuration of a hybrid vehicle 20 equipped with a power supply device as an embodiment of the present invention. As shown in the drawing, the hybrid vehicle 20 of the embodiment includes an engine 22 that uses gasoline or light oil as fuel, an engine electronic control unit (hereinafter referred to as “engine ECU”) 24 that controls the drive of the engine 22, and an engine. A planetary gear 30 having a carrier connected to the crankshaft 26 and a ring gear connected to a drive shaft 32 connected to drive wheels 39a and 39b via a differential gear 38, and a rotor configured as a synchronous generator motor, for example. A motor MG1 connected to the sun gear of the planetary gear 30, a motor MG2 configured as a synchronous generator motor and having a rotor connected to the drive shaft 32, inverters 41 and 42 for driving the motors MG1 and MG2, Switching elements (not shown) of the inverters 41 and 42 The motor electronic control unit (hereinafter referred to as “motor ECU”) 40 that controls the motors MG1 and MG2 by controlling the switching, and the motors MG1 and MG2 through the inverters 41 and 42, for example, lithium ion A high voltage battery 50 configured as a secondary battery and connected via a system main relay 53, a battery electronic control unit (hereinafter referred to as “battery ECU”) 52 for managing the high voltage battery 50, and inverters 41 and 42 are provided. A high voltage connected to a connected power line (hereinafter referred to as “high voltage system power line”) 64 and a power line (hereinafter referred to as “low voltage system power line”) 54 to which the high voltage battery 50 is connected. Maximum voltage VH of system power line 64 can be boosted from voltage VL of low voltage system power line 54 A boost converter 60 that performs power exchange between the high voltage system power line 64 and the low voltage system power line 54 by adjusting in the range of the voltage Vmax, and a low voltage system that smoothes the voltage VL of the low voltage system power line 54 A smoothing capacitor 55, a high voltage system smoothing capacitor 65 that smoothes the voltage VH of the high voltage system power line 64, and electrical components (for example, a throttle motor (not shown) used for controlling the engine 22 or an exhaust circulation device (not shown) for exhaust gas). A low voltage battery 58 that supplies power to an EGR valve that adjusts the amount of recirculation, an auxiliary machine (not shown), and the like, a DC / DC converter 57 that steps down the power from the low voltage system power line 54 and supplies the low voltage battery 58 to And a hybrid electronic control unit 70 for controlling the entire vehicle.

  The motor ECU 40 is configured as a microprocessor centered on a CPU (not shown), and includes a ROM, a RAM, an input / output port, and a communication port in addition to the CPU. The motor ECU 40 detects signals necessary for driving and controlling the motors MG1 and MG2, such as a signal from a rotational position detection sensor (not shown) that detects the rotational position of the rotor of the motors MG1 and MG2, and a current sensor (not shown). The phase current applied to the motors MG1 and MG2 is input, and the motor ECU 40 outputs a switching control signal to the inverters 41 and 42. The switching control of the inverters 41 and 42 is performed by sine wave control and overmodulation control in order from the lower rotational speed based on the high voltage system voltage VH, the torque commands Tm1 * and Tm2 * of the motors MG1 and MG2, and the rotational speeds Nm1 and Nm2. The control is switched so that the rectangular wave control is performed. The motor ECU 40 is in communication with the hybrid electronic control unit 70, controls the driving of the motors MG1 and MG2 by a control signal from the hybrid electronic control unit 70, and, if necessary, data on the operating state of the motors MG1 and MG2. Output to the hybrid electronic control unit 70. The motor ECU 40 also calculates the rotational speeds Nm1 and Nm2 of the motors MG1 and MG2 based on a signal from the rotational position detection sensor.

  The battery ECU 52 is configured as a microprocessor centered on a CPU (not shown), and includes a ROM, a RAM, an input / output port, and a communication port in addition to the CPU. The battery ECU 52 receives signals necessary for managing the high voltage battery 50, such as a voltage VL from the voltage sensor 51 a attached between the terminals of the high voltage battery 50, and a power line connected to the output terminal of the high voltage battery 50. The charging / discharging current Ib from the attached current sensor 51b, the battery temperature Tb from the temperature sensor 51c attached to the high voltage battery 50, and the like are input, and data on the state of the high voltage battery 50 is hybridized by communication as necessary. Output to the electronic control unit 70. Further, the battery ECU 52 calculates a storage ratio SOC, which is a ratio of the storage amount to the total capacity (storage capacity) based on the integrated value of the charge / discharge current Ib detected by the current sensor 51b in order to manage the high voltage battery 50. The input / output limits Win and Wout, which are the maximum allowable power that may charge / discharge the high voltage battery 50, are calculated based on the calculated storage ratio SOC and the battery temperature Tb. The input / output limits Win and Wout of the high-voltage battery 50 are set to the basic values of the input / output limits Win and Wout based on the battery temperature Tb, and the output limiting correction coefficient and the input are set based on the storage rate SOC of the high-voltage battery 50. It can be set by setting a correction coefficient for restriction and multiplying the basic value of the set input / output restrictions Win and Wout by the correction coefficient.

  As shown in FIG. 2, boost converter 60 includes two transistors T1 and T2, two diodes D1 and D2 connected in parallel to transistors T1 and T2, and a reactor L. The two transistors T1 and T2 are connected to the positive and negative buses of the inverters 41 and 42, respectively, and the reactor L is connected to the connection point. Further, the positive terminal and the negative terminal of the high voltage battery 50 are connected to the reactor L and the negative bus through the system main relay 53, respectively. Accordingly, the DC power of the high-voltage battery 50 is boosted and supplied to the inverters 41 and 42 by controlling the transistors T1 and T2 on and off, and the DC power acting on the positive and negative buses of the inverters 41 and 42 is applied. The high voltage battery 50 can be charged by reducing the voltage.

  The hybrid electronic control unit 70 is configured as a microprocessor centered on the CPU 72, and in addition to the CPU 72, a ROM 74 for storing processing programs, a RAM 76 for temporarily storing data, an input / output port and communication not shown. And a port. The hybrid electronic control unit 70 includes a shift position sensor that detects the high voltage system voltage VH from the voltage sensor 61 a attached to the high voltage system power line 64, the ignition signal from the ignition switch 80, and the operation position of the shift lever 81. The shift position SP from 82, the accelerator opening Acc from the accelerator pedal position sensor 84 for detecting the depression amount of the accelerator pedal 83, the brake pedal position BP from the brake pedal position sensor 86 for detecting the depression amount of the brake pedal 85, the vehicle speed The vehicle speed V from the sensor 88 is input via the input port. From the hybrid electronic control unit 70, a drive signal to the system main relay 53, a switching control signal to the boost converter 60, a switching control signal to the DC / DC converter 57, and the like are output via an output port. The hybrid electronic control unit 70 is connected to the engine ECU 24, the motor ECU 40, and the battery ECU 52 via a communication port, and exchanges various control signals and data with the engine ECU 24, the motor ECU 40, and the battery ECU 52.

  The hybrid vehicle 20 of the embodiment configured in this manner basically travels by drive control described below that is executed by the hybrid electronic control unit 70. When the hybrid electronic control unit 70 travels while operating the engine 22, first, the drive shaft 32 is used for traveling in accordance with the accelerator opening Acc from the accelerator pedal position sensor 84 and the vehicle speed V from the vehicle speed sensor 88. The required torque Tr * required is set, and the required torque Tr * is multiplied by the rotational speed Nr of the drive shaft 32 (for example, the rotational speed obtained by multiplying the rotational speed of the motor MG2 or the vehicle speed V by a conversion factor). The power Pdrv for traveling required for is calculated. Next, the required power Pe * to be output from the engine 22 as the sum of the charge / discharge required power Pb * for charging / discharging the high voltage battery 50 based on the storage rate SOC of the high voltage battery 50, the traveling power Pdrv, and the loss Loss. The engine 22 is calculated using the operation line (for example, the fuel efficiency optimum operation line) as the relationship between the rotational speed Ne of the engine 22 and the torque Te and the calculated required power Pe *. Target rotational speed Ne * and target torque Te * are set. As the torque to be output from the motor MG1 by the rotational speed feedback control so that the rotational speed Ne of the engine 22 becomes the target rotational speed Ne * within the range of the input / output limits Win and Wout of the high-voltage battery 50. Torque command Tm1 * is set and torque obtained by subtracting torque acting on drive shaft 32 via planetary gear 30 from drive torque 32 when motor MG1 is driven by torque command Tm1 * is used as torque command Tm2 * for motor MG2. Set. The target engine speed Ne * and target torque Te * set in this way are transmitted to the engine ECU 24, and torque commands Tm1 * and Tm2 * for the motors MG1 and MG2 are transmitted to the motor ECU 40. The engine ECU 24 that has received the target rotational speed Ne * and the target torque Te *, controls the intake air amount, fuel injection control, and ignition of the engine 22 so that the engine 22 is operated by the target rotational speed Ne * and the target torque Te *. The motor ECU 40 that executes the control and receives the torque commands Tm1 * and Tm2 * of the motors MG1 and MG2 sets the switching elements of the inverters 41 and 42 so that the motors MG1 and MG2 are driven by the torque commands Tm1 * and Tm2 *. Control switching. Hereinafter, such traveling is referred to as hybrid traveling. During this hybrid travel, the hybrid electronic control unit 70 drives the motors MG1, MG2 based on the torque commands Tm1 *, Tm2 * of the motors MG1, MG2 and the rotational speeds Nm1, Nm2 of the motors MG1, MG2. The target voltage command VH * is set by obtaining the voltage required for the above-described operation, and the two transistors T1 and T2 of the boost converter 60 are subjected to switching control so that the high voltage system voltage VH becomes the set target voltage command VH *.

  Further, when the hybrid electronic control unit 70 travels with the engine 22 stopped, the hybrid electronic control unit 70 sets the required torque Tr * required for the drive shaft 32 according to the accelerator opening Acc and the vehicle speed V, and the battery Within the range of 50 input / output limits Win, Wout, a value 0 is set for the torque command Tm1 * of the motor MG1, and a required torque Tr * is set for the torque command Tm2 * of the motor MG2. Then, the set torque commands Tm1 * and Tm2 * are transmitted to the motor ECU 40. The motor ECU 40 that receives the torque commands Tm1 * and Tm2 * performs switching control of the switching elements of the inverters 41 and 42 so that the motors MG1 and MG2 are driven by the torque commands Tm1 * and Tm2 *. Hereinafter, such traveling is referred to as electric traveling. During this electric travel, the hybrid electronic control unit 70 obtains a voltage required to drive the motor MG2 based on the torque command Tm2 * of the motor MG2 and the rotational speed Nm2 of the motor MG2, and calculates a target voltage command. VH * is set, and the two transistors T1 and T2 of the boost converter 60 are subjected to switching control so that the high voltage system voltage VH becomes the set target voltage command VH *.

  Here, the high-voltage battery 50, the boost converter 60, the high-voltage smoothing capacitor 65, the battery ECU 52, and the hybrid electronic control unit 70 mainly correspond to the power supply device of the embodiment.

  Next, the operation when the electric power for charging the high voltage battery 50 reaches the vicinity of the input limit Win of the high voltage battery 50 while the hybrid vehicle 20 of the embodiment is traveling will be described. FIG. 3 is a flowchart illustrating an example of an input restriction avoidance target voltage correction routine executed by the hybrid electronic control unit 70 according to the embodiment. This routine is repeatedly executed every predetermined time (for example, every several milliseconds) after the system is started.

  When the input restriction avoidance target voltage correction routine is executed, the CPU 72 of the hybrid electronic control unit 70 first receives the rotational speeds Nm1 and Nm2 of the motors MG1 and MG2, torque commands Tm1 * and Tm2 *, and the voltage sensor 61a. A process of inputting the high voltage system voltage VH and the input limit Win of the high voltage battery 50 is executed (step S100). Here, the rotation speeds Nm1 and Nm2 of the motors MG1 and MG2 are input from the motor ECU 40 by communication from the motor ECU 40 calculated based on the rotation positions of the rotors of the motors MG1 and MG2 detected by a rotation position detection sensor (not shown). To do. The torque commands Tm1 * and Tm2 * are inputted by reading out the torque commands Tm1 * and Tm2 * which are set by a drive control routine (not shown) and stored in a predetermined area of the RAM 76. The input restriction Win of the high voltage battery 50 is set based on the battery temperature Tb of the high voltage battery 50 and the storage rate SOC of the high voltage battery 50 and is input from the battery ECU 52 by communication.

  When the data is input in this way, the motor powers Pm1, Pm2 consumed or generated by the motors MG1, MG2 are calculated by multiplying the rotational speeds Nm1, Nm2 of the motors MG1, MG2 by the torque commands Tm1 *, Tm2 *, respectively (step S110). ) The difference between the square value of the high voltage system voltage VH and the square value of the high voltage system voltage VH when this routine was executed last time is equal to the capacitance C and the value 1 / Is multiplied by 2 to calculate the capacitor power Pc for charging / discharging the high-voltage smoothing capacitor 65 (step S120), and the sum of the calculated motor power Pm1, Pm2 and the capacitor power Pc is calculated as the determination power Pj (step S120). S130). Then, it is determined whether or not the determination power Pj is smaller than the value obtained by adding the margin α1 to the input limit Win of the high-voltage battery 50 (step S140), and the high voltage system voltage VH is increased from the maximum boostable voltage Vmax to the margin β. It is determined whether or not the value is smaller than the value obtained by subtracting (step S150). Here, the margin α1 is determined when it is determined that the power for charging the high-voltage battery 50 has reached the vicinity of the input limit Win in consideration of devices that consume power other than the motors MG1, MG2 and the high-voltage smoothing capacitor 65. And can be determined by the characteristics of the high-voltage battery 50, the characteristics of the devices that consume power other than the motors MG1 and MG2 and the high-voltage smoothing capacitor 65, and the like. The margin β is a voltage difference that can charge the high-voltage smoothing capacitor 65 with a certain amount of power, and can be determined by the characteristics of the high-voltage smoothing capacitor 65 and the like. In the embodiment, since the sign is considered as the power for charging the high voltage battery 50 being negative (the power discharged from the high voltage battery 50 is positive), the input limit Win is a negative value. The addition of the margin α to the input restriction Win reduces the margin α from the input restriction Win if the sign is considered with the electric power for charging the high voltage battery 50 being positive.

  When the determination power Pj is less than the value obtained by adding the margin α1 to the input limit Win of the high voltage battery 50, and the high voltage system voltage VH is less than the value obtained by subtracting the margin β from the maximum boostable voltage Vmax, the high voltage battery The power for charging 50 reaches the vicinity of the input limit Win, and it is determined that there is room for charging the high voltage system smoothing capacitor 65, and the target voltage command VH * is set to the target voltage command VH *. VH * is corrected (step S160), and this routine is terminated. When the target voltage command VH * is corrected, the two transistors Tr1 and Tr2 of the boost converter 60 are subjected to switching control so that the high voltage system voltage VH becomes the target voltage command VH *. FIG. 4 shows an example of a time change between the determination power Pj and the high voltage system voltage VH at this time. In the figure, the solid line in the determination power Pj indicates the time change of the determination power Pj when the input restriction avoidance target voltage correction routine of the embodiment is being executed, and the alternate long and short dash line indicates the input restriction avoidance target voltage correction routine. The time change of the determination power Pj when not executed is shown as a comparative example. In the comparative example, the target voltage command VH * is not corrected even at time T1 when the determination power Pj is reduced to a value less than the value obtained by adding the margin α1 to the input limit Win of the high-voltage battery 50. Therefore, the determination power Pj Becomes smaller thereafter and exceeds the input limit Win of the high-voltage battery 50. On the other hand, in the embodiment, the target voltage command VH * is corrected to the boostable maximum voltage Vmax at the time T1 when the determination power Pj is less than the value obtained by adding the margin α1 to the input limit Win of the high-voltage battery 50, and the boost converter 60 Therefore, the high voltage system voltage VH rises to the boostable maximum voltage Vmax. During this period, the determination power Pj is large (small as an absolute value) because the high voltage system smoothing capacitor 65 is charged. Thus, it moves away from the vicinity of the input limit Win of the high-voltage battery 50. By such charging of the high-voltage smoothing capacitor 65, the determination power Pj depends on the subsequent driving of the motors MG1 and MG2, but if it is the same as in the comparative example, it becomes smaller thereafter but the input limit Win of the high-voltage battery 50 It will rise without exceeding.

  If it is determined in step S140 that the determination power Pj is equal to or greater than the value obtained by adding the margin α1 to the input limit Win of the high voltage battery 50, the power for charging the high voltage battery 50 does not reach the vicinity of the input limit Win. This routine is terminated without correcting the target voltage command VH *, and it is determined in step S140 that the determination power Pj is less than the value obtained by adding the margin α1 to the input limit Win of the high voltage battery 50. If it is determined in step S150 that the high voltage system voltage VH is equal to or greater than the value obtained by subtracting the margin β from the boostable maximum voltage Vmax, the power for charging the high voltage battery 50 has reached the vicinity of the input limit Win. It is determined that there is no room for charging the system smoothing capacitor 65, and this routine is executed without correcting the target voltage command VH *. To completion. In this case, a technique different from the technique of the present invention, for example, a technique for imposing driving restrictions on the motors MG1 and MG2 so that the power for charging the high voltage battery 50 does not exceed the input restriction Win is used. The method for preventing the electric power for charging the high voltage battery 50 from exceeding the input limit Win is performed after the method for correcting the target voltage command VH * in the above-described embodiment to the maximum voltage Vmax that can be boosted is executed. It is also used when the power for charging is likely to exceed the input limit Win.

  According to the power supply device mounted on the hybrid vehicle 20 of the embodiment described above, the motor power Pm1 and Pm2 consumed or generated by the motors MG1 and MG2 and the capacitor power Pc for charging and discharging the high voltage system smoothing capacitor 65 are used. The determination power Pj as the sum power is less than the value obtained by adding the margin α1 to the input limit Win of the high voltage battery 50, and the high voltage system voltage VH is less than the value obtained by subtracting the margin β from the maximum boostable voltage Vmax. In some cases, the target voltage command VH * is corrected to the maximum voltage Vmax that can be boosted to increase the high voltage system voltage VH to the maximum voltage Vmax that can be boosted, and the high voltage system smoothing capacitor 65 is charged. The electric power for charging the high voltage battery 50 by increasing the electric power Pj (small in absolute value) exceeds the input limit Win. Can be suppressed. Therefore, even when the high voltage battery 50 is charged by excessive electric power due to a sudden change in the rotation speed Nm2 of the motor MG2 generated when the drive wheels 39a and 39b are gripped after slipping due to idling, the electric power for charging the high voltage battery 50 is high. Exceeding the input limit Win of the battery 50 can be suppressed. Further, when the control of the inverters 41 and 42 is sequentially changed from sine wave control to overmodulation control and rectangular wave control, the rotational speed Nm1 of the motor MG1 and the rotational speed Nm2 of the motor MG2 change suddenly, and the disturbance of the power balance increases. However, it is possible to suppress the electric power for charging the high voltage battery 50 from exceeding the input limit Win of the high voltage battery 50.

  In the power supply device mounted on the hybrid vehicle 20 of the embodiment, even if it is determined that the determination power Pj is less than the value obtained by adding the margin α1 to the input limit Win of the high-voltage battery 50, the high voltage system voltage VH can be boosted. When it is determined that the voltage Vmax is equal to or greater than the value obtained by subtracting the margin β, it is determined that the power for charging the high-voltage battery 50 has reached the vicinity of the input limit Win but there is no room for charging the high-voltage smoothing capacitor 65. Although the target voltage command VH * is not corrected, the target voltage command VH * may be corrected to the boostable maximum voltage Vmax even in this case.

  In the power supply device mounted on the hybrid vehicle 20 of the embodiment, the determination power Pj is less than the value obtained by adding the margin α1 to the input limit Win of the high voltage battery 50, and the high voltage system voltage VH is the maximum voltage Vmax that can be boosted. Is less than the value obtained by subtracting the margin β, the target voltage command VH * is corrected to the maximum voltage Vmax that can be boosted. However, since the high voltage system smoothing capacitor 65 has only to be charged, the target voltage command VH * is As long as the correction is made to increase, the correction may not be made to the maximum boostable voltage Vmax.

  In the power supply device mounted on the hybrid vehicle 20 of the embodiment, the sum of the motor power Pm1, Pm2 consumed or generated by the motors MG1, MG2 and the capacitor power Pc for charging / discharging the high voltage smoothing capacitor 65 is used. Although it is determined whether or not the power for charging the high voltage battery 50 by the determination power Pj has reached the vicinity of the input limit Win of the high voltage battery 50, the voltage from the voltage sensor 51a attached between the terminals of the high voltage battery 50 is determined. The charge / discharge power Pchg for charging / discharging the high-voltage battery 50 is obtained by the product of VL and the charge / discharge current Ib from the current sensor 51b attached to the power line connected to the output terminal of the high-voltage battery 50, and this charge / discharge power Pchg. It is good also as what determines whether the input limit Win vicinity of the high voltage battery 50 was reached. An example of an input restriction avoidance target voltage correction routine in this case is shown in FIG. In the input restriction avoidance target voltage correction routine of this modification, the voltage VL from the voltage sensor 51a and the charging / discharging current Ib from the current sensor 51b are input by communication from the battery ECU 52 and the high voltage system voltage from the voltage sensor 61a. VH is input (step S200), charge / discharge power Pchg for charging / discharging high voltage battery 50 is calculated as the product of input voltage VL and charge / discharge current Ib (step S210). It is determined whether or not the input limit Win is less than the value obtained by adding the margin α2 (step S220), and whether or not the high voltage system voltage VH is less than the value obtained by subtracting the margin β from the maximum boostable voltage Vmax. The charge / discharge power Pchg adds a margin α2 to the input limit Win of the high-voltage battery 50 (step S230). The target voltage command VH * is corrected to the boostable maximum voltage Vmax when it is less than the obtained value and the high voltage system voltage VH is less than the value obtained by subtracting the margin β from the boostable maximum voltage Vmax (step S240). This routine is terminated. Here, the margin α2 is set as a margin for determining that the power for charging the high-voltage battery 50 has reached the vicinity of the input limit Win, and can be determined by the characteristics of the high-voltage battery 50 and the like. The same value as the margin α1 described above may be used, or a value different from the margin α1 may be used. In this way, the charge / discharge power Pchg for charging / discharging the high-voltage battery 50 is calculated, and the determination is made more directly and accurately by determining whether the charge / discharge power Pchg has reached the vicinity of the input limit Win of the high-voltage battery 50. Can be done. In the embodiment, the determination power Pj is used without using the charge / discharge power Pchg because the time interval for detecting the voltage VL of the high-voltage battery 50 and the charge / discharge current Ib depends on the storage ratio SOC and the input / output limits Win, Wout. Since the time interval for controlling the motors MG1 and MG2 is as small as about msec, when the charge / discharge power Pchg based on the product of the voltage VL and the charge / discharge current Ib is used, the rotation speed of the motors MG1 and MG2 This is because there may be a case where it is impossible to follow a rapid change in power accompanying a sudden change in Nm1 and Nm2. Therefore, when charging / discharging power Pchg based on the product of voltage VL and charging / discharging current Ib is used, voltage VL and charging / discharging current Ib are sufficient to follow the sudden changes in rotation speeds Nm1, Nm2 of motors MG1, MG2. It is necessary to reduce the detection time interval.

  In the embodiment, the power supply device mounted on the hybrid vehicle 20 has been described as an embodiment. However, as illustrated in FIG. 6, the boost converter 60 is provided between the battery 50 and the inverter INV that drives the motor MG. A power supply device mounted on an electric vehicle 120 including a smoothing capacitor 65 on the inverter INV side from the boost converter 60 may be used, or a power supply device mounted on a moving body such as a vehicle other than the vehicle, a ship, or an aircraft. The power supply device may be incorporated in a construction facility that does not move. Moreover, it does not matter as a form of the control method of the power supply device.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the high voltage battery 50 configured as a lithium ion secondary battery corresponds to a “secondary battery”, and the high voltage system power line 64 to which the inverters 41 and 42 are connected and the low voltage to which the high voltage battery 50 is connected. The high voltage system power line 64 and the low voltage system are adjusted by adjusting the voltage VH of the high voltage system power line 64 connected to the system power line 54 within the range from the voltage VL of the low voltage system power line 54 to the maximum boostable voltage Vmax. The boost converter 60 that exchanges power with the power line 54 corresponds to a “boost converter”, the high voltage system smoothing capacitor 65 attached to the high voltage system power line 64 corresponds to a “smoothing capacitor”, and the current The storage rate SOC of the high voltage battery 50 based on the integrated value of the charge / discharge current Ib detected by the sensor 51b and the temperature sensor 51c. The battery ECU 52 that calculates the input limit Win that is the maximum allowable power that may charge the high-voltage battery 50 based on the battery temperature Tb of the high-pressure battery 50 corresponds to “input limit setting means” and is consumed by the motors MG1 and MG2. Alternatively, the determination power Pj as the sum of the generated motor power Pm1, Pm2 and the capacitor power Pc for charging / discharging the high voltage system smoothing capacitor 65 is less than the value obtained by adding the margin α1 to the input limit Win of the high voltage battery 50. The hybrid electronic control unit 70 that executes the processing of steps S100 to S140 of the input restriction avoidance target voltage correction routine of FIG. Pj is less than the value obtained by adding the margin α1 to the input limit Win of the high voltage battery 50, and the high voltage system voltage V 3 is less than the value obtained by subtracting the margin β from the maximum boostable voltage Vmax, the processing of steps S140 to S160 of the input restriction avoidance target voltage correction routine of FIG. 3 for correcting the target voltage command VH * to the maximum boostable voltage Vmax. The hybrid electronic control unit 70 that performs switching control of the two transistors Tr1 and Tr2 of the boost converter 60 so that the voltage VH of the high voltage system power line 64 becomes the corrected target voltage command VH *. It corresponds to.

  Here, the “secondary battery” is not limited to the high voltage battery 50 configured as a lithium ion secondary battery, and various types such as a nickel hydride secondary battery, a nickel cadmium secondary battery, and a lead storage battery can be used. Can be used. As the “boost converter”, the voltage VH of the high voltage system power line 64 is connected to the high voltage system power line 64 to which the inverters 41 and 42 are connected and the low voltage system power line 54 to which the high voltage battery 50 is connected. It is limited to the boost converter 60 that adjusts the voltage within the range from the voltage VL of the low voltage system power line 54 to the maximum voltage Vmax that can be boosted, and exchanges power between the high voltage system power line 64 and the low voltage system power line 54. The battery voltage system is connected to the battery voltage system to which the secondary battery is connected and the drive voltage system to which the drive device is connected to adjust the voltage of the drive voltage system to a voltage higher than the voltage of the battery voltage system. As long as power is exchanged between the drive voltage system and the drive voltage system, it may be anything. The “smoothing capacitor” is not limited to the high voltage system smoothing capacitor 65, and may be any as long as it smooths the voltage of the driving voltage system. The “input limit setting means” is based on the storage ratio SOC of the high voltage battery 50 based on the integrated value of the charge / discharge current Ib detected by the current sensor 51b and the battery temperature Tb of the high voltage battery 50 detected by the temperature sensor 51c. In addition to the storage ratio SOC and the battery temperature Tb, for example, based on the internal resistance of the high voltage battery 50 or the like As long as the input limit is set as the maximum power that may be charged to the secondary battery based on the state of the secondary battery, such as what is calculated in this manner, it may be anything. As the “exceeding limit prediction state determination means”, the determination power as the sum of the motor power Pm1 and Pm2 consumed or generated by the motors MG1 and MG2 and the capacitor power Pc for charging and discharging the high-voltage smoothing capacitor 65 is used. It is not limited to determining whether Pj is less than the value obtained by adding the margin α1 to the input limit Win of the high-voltage battery 50. The voltage VL from the voltage sensor 51a attached between the terminals of the high-voltage battery 50 is not limited. Charge / discharge power Pchg for charging / discharging the high-voltage battery 50 calculated by the product of the charge-discharge current Ib from the current sensor 51 b attached to the power line connected to the output terminal of the high-voltage battery 50 is input to the high-voltage battery 50. The charging power for charging the secondary battery, such as one that determines whether or not the limit Win has been reached, exceeds the input limit. But may be of any type intended to determine the limit exceeded predicted state is a state. As the “control means”, the determination power Pj is less than the value obtained by adding the margin α1 to the input limit Win of the high voltage battery 50, and the high voltage system voltage VH is a value obtained by subtracting the margin β from the maximum boostable voltage Vmax. If it is less than the target voltage command VH *, the two transistors Tr1 of the boost converter 60 are corrected to the maximum voltage Vmax that can be boosted and the voltage VH of the high voltage system power line 64 becomes the corrected target voltage command VH *. It is not limited to the one that controls the switching of Tr2, and if the determination power Pj is less than the value obtained by adding the margin α1 to the input limit Win of the high-voltage battery 50, the high voltage system voltage VH is margined from the maximum boostable voltage Vmax. Even if the value is not less than the value obtained by subtracting β, the target voltage command VH * is corrected to the boostable maximum voltage Vmax and the high voltage system power The two transistors Tr1 and Tr2 of the boost converter 60 are subjected to switching control so that the voltage VH of the line 64 becomes the corrected target voltage command VH *, or the target voltage command VH * is set to a voltage smaller than the maximum boostable voltage Vmax. Anything may be used as long as it controls the boost converter so that the voltage of the drive voltage system becomes higher when the limit excess prediction state is determined, such as correction.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the power supply device manufacturing industry.

  20 hybrid vehicle, 22 engine, 24 engine electronic control unit (engine ECU), 26 crankshaft, 30 planetary gear, 32 drive shaft, 38 differential gear, 39a, 39b drive wheel, 40 motor electronic control unit (motor ECU), 41, 42 Inverter, 50 High voltage battery, 51a Voltage sensor, 51b Current sensor, 51c Temperature sensor, 52 Electronic control unit for battery (battery ECU), 53 System main relay, 54 Low voltage system power line, 55 Low voltage system smoothing capacitor 57 DC / DC converter, 58 low voltage battery, 60 boost converter, 61a voltage sensor, 64 high voltage power line, 65 high voltage smoothing capacitor, 70 electronic control unit for hybrid, 72 CPU, 74 ROM, 76 RAM, 80 ignition switch, 81 shift lever, 82 shift position sensor, 83 accelerator pedal, 84 accelerator pedal position sensor, 85 brake pedal, 86 brake pedal position sensor, 88 vehicle speed sensor, 120 electric vehicle, MG , MG1, MG2 motor, INV inverter.

Claims (7)

A power supply device that exchanges power with a drive device including at least one electric motor that inputs and outputs power,
A secondary battery,
The battery voltage system connected to the battery voltage system to which the secondary battery is connected and the drive voltage system to which the driving device is connected to adjust the voltage of the drive voltage system to a voltage higher than the voltage of the battery voltage system and the battery voltage A boost converter for exchanging power between a system and the drive voltage system;
A smoothing capacitor for smoothing the voltage of the drive voltage system;
Input limit setting means for setting an input limit as the maximum power that may be charged to the secondary battery based on the state of the secondary battery;
Limit excess prediction state determination means for determining a limit excess prediction state in which charging power for charging the secondary battery is likely to exceed the set input limit;
Control means for controlling the boost converter so that the voltage of the drive voltage system becomes high when the limit excess prediction state is determined;
A power supply device comprising: The power supply device according to claim 1,
The control means is means for controlling the boost converter so that the voltage of the drive voltage system becomes a maximum voltage allowed for the drive voltage system when the limit excess prediction state is determined.
Power supply. The power supply device according to claim 1 or 2,
When the difference between the voltage of the drive voltage system and the maximum voltage allowed for the drive voltage system is greater than or equal to a predetermined voltage when the limit excess prediction state is determined, the control means Means for controlling the boost converter to be higher,
Power supply. The power supply device according to any one of claims 1 to 3,
The control means is means for controlling the boost converter so that the voltage of the drive voltage system becomes a voltage according to a request of the drive device when the limit excess prediction state is not determined.
Power supply. The power supply device according to any one of claims 1 to 4,
The over-limit prediction state determination means is a means for determining that the over-limit prediction state is established when charging power for charging the secondary battery reaches a range of a first margin from the set input limit. is there,
Power supply. The power supply device according to any one of claims 1 to 4,
The limit excess prediction state determination means is a sum of the drive-induced power consumed or generated by the driving device and the capacitor-derived power stored in or discharged from the smoothing capacitor due to a voltage change of the drive voltage system. Is a means for determining that the limit excess prediction state is reached when the input limit is within a second margin range from the set input limit.
Power supply. The voltage of the drive voltage system is connected to a drive voltage system to which a secondary battery and a drive device including at least one electric motor that inputs and outputs power are connected and a battery voltage system to which the secondary battery is connected. A power supply comprising: a step-up converter that adjusts a voltage equal to or higher than a voltage of the battery voltage system and exchanges power between the battery voltage system and the drive voltage system; and a smoothing capacitor that smoothes the voltage of the drive voltage system An apparatus control method comprising:
When it is determined that the limit excess prediction state in which the charging power for charging the secondary battery is likely to exceed the input limit as the maximum power that may charge the secondary battery, the voltage of the drive voltage system is high. Controlling the boost converter to
A control method for a power supply device.

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