JP5716548B2 - Drive device and electric vehicle - Google Patents

Description

  The present invention relates to a drive device and an electric vehicle, and more specifically, a secondary battery connected to a first voltage system, an electric motor connected to a second voltage system, and a reactor connected to the first voltage system. And a step-up converter capable of stepping up the voltage of the second voltage system relative to the first voltage system, and a capacitor attached to the first voltage system, and an electric vehicle including the drive device About.

  Conventionally, this type of drive device has a power storage device, a traveling motor, a reactor connected to the power storage device, and two switching elements, and converts a DC input voltage (voltage of the power storage device) to generate a DC output. A DC-DC converter for obtaining a voltage (voltage supplied to the motor for traveling) and a capacitor connected in parallel to the power storage device as viewed from the DC-DC converter, and a time that is ½ of the switching cycle of the two switching elements At intervals, the current value acquisition unit acquires the current value of the reactor in the current rising section and the current falling section of the current waveform of the reactor, and the current value acquired in the current rising section and the current value acquired in the current falling section Based on this, a method for estimating (acquiring) the center value of the current of the reactor has been proposed (see, for example, Patent Document 1).

JP 2010-22170 A

  In such a drive device, in order to more appropriately grasp or control the electric power supplied from the DC-DC converter to the traveling motor, one of the problems is to acquire the reactor current more appropriately. ing. In particular, the reactor current is considered to behave differently depending on whether or not the DC output voltage is boosted with respect to the DC input voltage by the DC-DC converter. It is.

  The drive device of the present invention is mainly intended to more appropriately acquire the reactor current flowing through the reactor of the boost converter.

  The drive device and the electric vehicle of the present invention employ the following means in order to achieve the main object described above.

The drive device of the present invention is
A secondary battery connected to a first voltage system; an electric motor connected to a second voltage system; and a reactor connected to the first voltage system. A drive device comprising: a boost converter capable of boosting a first voltage system; and a capacitor attached to the first voltage system,
A battery current detection sensor for detecting a battery current flowing in the secondary battery;
A reactor current detection sensor for detecting a reactor current flowing through the reactor;
The difference between the detected value by the reactor current sensor and the detected value by the battery current sensor at the time of non-boosting when the voltage of the second voltage system is not boosted with respect to the voltage of the first voltage system by the boost converter. A non-boosting correction unit that sets a first learning value based on the correction value and corrects a detection value by the reactor current sensor using the set first learning value;
When boosting the voltage of the second voltage system with respect to the voltage of the first voltage system by the boost converter, the difference between the detected value by the reactor current sensor and the detected value by the battery current sensor A boosting correction unit that sets a second learning value based on the correction value and corrects a detection value by the reactor current sensor using the set second learning value;
It is a summary to provide.

  In the driving device of the present invention, when the voltage of the second voltage system is not boosted with respect to the voltage of the first voltage system by the boost converter, the detected value by the reactor current sensor and the detected value by the battery current sensor The first learning value is set based on the difference between and the detected value by the reactor current sensor is corrected using the set first learning value. Further, when boosting the voltage of the second voltage system with respect to the voltage of the first voltage system by the boost converter, the second voltage system voltage is increased based on the difference between the detected value by the reactor current sensor and the detected value by the battery current sensor. The learning value of 2 is set, and the detection value by the reactor current sensor is corrected using the set second learning value. Normally, the difference between the reactor current and the battery current appears differently at non-boosting and boosting, so based on the difference between the detected value by the reactor current sensor and the detected value by the battery current sensor, The reactor current can be acquired more appropriately by setting the learning value separately at the time of boosting and correcting the detection value by the reactor current sensor.

  In such a driving apparatus of the present invention, the non-boosting correction means includes a difference value obtained by subtracting a detection value obtained by the battery current sensor from a detection value obtained by the reactor current sensor, an average value of the difference value at a first predetermined number of times, A means for setting one of average values of the difference values at a first predetermined time as the first learning value, and the boost correction means at the second predetermined number of times of the difference value and the difference value; The average value or the average value of the difference values at a second predetermined time may be a means for setting as the second learning value. Here, the “average value” includes values such as a simple moving average, a weighted moving average, and an exponential moving average.

  The drive device according to the present invention may further include an electric device connected to the first electric system, and the non-boosting correction unit may detect a value detected by the reactor current sensor when the electric device is operating. The first learning value is set based on a difference between the sum of the device current flowing in the electric device and a detection value by the battery current sensor, and the step-up correction unit includes the electric device Means for setting the second learning value based on a difference between a value detected by the reactor current sensor and a device current flowing in the electric device and a value detected by the battery current sensor when operating; It can also be.

  In the driving apparatus according to the aspect of the invention including the electrical device, the non-boosting correction unit is configured to add a value detected by the reactor current sensor and a device current flowing through the electrical device when the electrical device is operating. Any of the second difference value obtained by subtracting the value detected by the battery current sensor from the average value, the average value of the second difference value at a third predetermined number of times, and the average value of the second difference value at a third predetermined time Is set as the first learning value, and the correction unit at the time of boosting is a fourth predetermined value of the second difference value and the second difference value when the electric device is operating. Means for setting either the average value of the number of times or the average value of the second difference value at a fourth predetermined time as the second learning value. Here, the “average value” includes a simple moving average Or weighted moving average, finger It includes moving average value due.

  The electric vehicle of the present invention is connected to the driving device of the present invention according to any one of the above-described aspects, that is, basically the secondary battery connected to the first voltage system and the second voltage system. An electric motor, a booster converter having a reactor connected to the first voltage system and capable of boosting the voltage of the second voltage system with respect to the first voltage system, and attached to the first voltage system A battery current detection sensor for detecting a battery current flowing through the secondary battery, a reactor current detection sensor for detecting a reactor current flowing through the reactor, and the boost converter Based on the difference between the value detected by the reactor current sensor and the value detected by the battery current sensor when the voltage of the second voltage system is not boosted relative to the voltage of the first voltage system. Non-boosting correction means for correcting the detected value by the reactor current sensor using the set first learning value, and the boost converter converts the voltage of the second voltage system by the first learning value. A second learning value is set based on a difference between a detected value by the reactor current sensor and a detected value by the battery current sensor at the time of boosting with respect to the voltage of the first voltage system; And a driving device having a boosting correction unit that corrects the detection value of the reactor current sensor using the learning value of 2, and travels using the power from the electric motor.

  Since the electric vehicle according to the present invention includes the drive device according to any one of the above-described aspects, the same effect as that obtained by the drive device described above, for example, the effect that the reactor current can be acquired more appropriately. There is an effect.

It is a block diagram which shows the outline of a structure of the electric vehicle 20 carrying the drive device as one Example of this invention. 2 is a configuration diagram showing an outline of a configuration of an electric drive system including a motor 32. FIG. 3 is a flowchart showing an example of a reactor current correction routine executed by an electronic control unit 50. It is explanatory drawing which shows an example of the mode of a time change of the actual electric current Ibact which flows into the battery 36 when the electric equipment 70 is not operating, and the actual electric current ILact which flows into the reactor L. FIG. 11 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 120 according to a modification. FIG. 11 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 220 of a modified example. FIG. 11 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 320 of a modified example.

  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 an electric vehicle 20 equipped with a drive device as an embodiment of the present invention, and FIG. 2 is a configuration diagram showing an outline of the configuration of an electric drive system including a motor 32. It is. As shown in FIG. 1, the electric vehicle 20 according to the embodiment drives a motor 32 that can input and output power to a drive shaft 22 connected to drive wheels 26 a and 26 b via a differential gear 24, and a motor 32. Inverter 34, a battery 36 configured as, for example, a lithium ion secondary battery, a power line (hereinafter referred to as a drive voltage system power line) 42 to which the inverter 34 is connected, and a power line (hereinafter referred to as a drive voltage system power line) 42 to which the battery 36 is connected. A boost converter that adjusts the voltage VH of the drive voltage system power line 42 and exchanges power between the drive voltage system power line 42 and the battery voltage system power line 44. 40, an electric device 70 connected to the battery voltage system power line 44, and an electronic control unit for controlling the entire vehicle. It includes a 50, a. The electric device 70 includes an air compressor in an air conditioner that performs air conditioning in the passenger compartment, and a low-voltage battery that is configured as, for example, a lead-acid battery by lowering the power of the battery voltage system power line 44 and having a lower voltage than the battery 36. A DC / DC converter or the like that supplies a connected low voltage system power line can be considered.

  The motor 32 is configured as a well-known synchronous generator motor including a rotor embedded with permanent magnets and a stator wound with a three-phase coil. As shown in FIG. 2, the inverter 34 includes transistors T11 to T16 as six switching elements, and six diodes D11 to D16 connected in parallel to the transistors T11 to T16 in the reverse direction. The transistors T11 to T16 are arranged in pairs so as to be on the source side and the sink side with respect to the positive and negative buses of the drive voltage system power line 42, and each of the connection points between the paired transistors. The three-phase coils (U-phase, V-phase, W-phase) of the motor 32 are connected to each other. Therefore, a rotating magnetic field can be formed in the three-phase coil and the motor 32 can be driven to rotate by adjusting the ratio of the on-time of the transistors T11 to T16 while the voltage is applied to the inverter 34. A smoothing capacitor 46 is connected to the positive and negative buses of the drive voltage system power line 42.

  As shown in FIG. 2, the boost converter 40 is configured as a boost converter including two transistors T31 and T32, two diodes D31 and D32 connected in parallel in opposite directions to the transistors T31 and T32, and a reactor L. . The two transistors T31 and T32 are respectively connected to the positive bus of the drive voltage system power line 42, the negative bus of the drive voltage system power line 42 and the battery voltage system power line 44, and the connection point between the transistors T31 and T32. A reactor L is connected to the positive electrode bus of the battery voltage system power line 44. Therefore, by turning on and off the transistors T31 and T32, the power of the battery voltage system power line 44 is boosted and supplied to the drive voltage system power line 42, or the power of the drive voltage system power line 42 is lowered to reduce the battery voltage system. Or can be supplied to the power line 44. A smoothing capacitor 48 is connected to the positive and negative buses of the battery voltage system power line 44.

  The electronic control unit 50 is configured as a microprocessor centered on the CPU 52, and includes a ROM 54 that stores a processing program, a RAM 56 that temporarily stores data, and an input / output port (not shown) in addition to the CPU 52. . The electronic control unit 50 includes a rotational position θm of the rotor of the motor 32 from a rotational position detection sensor 32a that detects the rotational position of the rotor of the motor 32, and phase currents flowing in the V phase and W phase of the three-phase coil of the motor 32. The phase currents Iv and Iw from the current sensors 23V and 23W, the inter-terminal voltage Vb from the voltage sensor 37a attached between the terminals of the battery 36, and the charge from the current sensor 37b attached to the output terminal of the battery 36. Discharge current Ib, battery temperature Tb from temperature sensor 37c attached to battery 36, reactor current IL from current sensor 41 attached between the connection point between transistors T31 and T32 of boost converter 30 and reactor L, The voltage of the capacitor 46 from the voltage sensor 46a attached between the terminals of the capacitor 46 ( The voltage of the dynamic voltage system power line 42) VH, the voltage of the capacitor 48 from the voltage sensor 48a attached between the terminals of the capacitor 48 (voltage of the battery voltage system power line 44) VL, the power sensor attached to the electrical device 70. 71, device power (power from the battery voltage system power line 44 to the electrical device 70) Ph, ignition signal from the ignition switch 60, shift position SP from the shift position sensor 62 that detects the operation position of the shift lever 61, accelerator The accelerator opening Acc from the accelerator pedal position sensor 64 that detects the amount of depression of the pedal 63, the brake pedal position BP from the brake pedal position sensor 66 that detects the amount of depression of the brake pedal 65, the vehicle speed V from the vehicle speed sensor 68, etc. Input port Is entered through. In the embodiment, the current sensor 37b and the current sensor 41 are designed so that the current sensor 37b has higher detection accuracy and the current sensor 41 has higher responsiveness. From the electronic control unit 50, a switching control signal to the transistors T11 to T16 of the inverter 34, a switching control signal to the transistors T31 and T32 of the boost converter 40, a control signal to the electric device 70, and the like are output via the output port. ing. The electronic control unit 50 calculates the electrical angle θe and the rotational speed Nm of the rotor of the motor 32 based on the rotational position θm of the rotor of the motor 32 detected by the rotational position detection sensor 32a, or detects it by the current sensor 37b. On the basis of the charged / discharge current Ib of the battery 36, the storage ratio SOC, which is the ratio of the amount of power that can be discharged from the battery 36 at that time, to the total capacity is calculated, or based on the calculated storage ratio SOC and the battery temperature Tb The input / output limits Win and Wout, which are the maximum allowable power that may charge and discharge the battery 36, are calculated.

  In the electric vehicle 20 of the embodiment thus configured, the electronic control unit 50 requires the required torque to be output to the drive shaft 22 in accordance with the accelerator opening Acc from the accelerator pedal position sensor 64 and the vehicle speed V from the vehicle speed sensor 68. Tr * is set, input / output limits Win and Wout of the battery 36 are divided by the rotational speed Nm of the motor 32, and torque limits Tmin and Tmax as upper and lower limits of torque that may be output from the motor 32 are set and requested. A torque command Tm * is set as a torque to be output from the motor 32 by limiting the torque Tr * with the torque limits Tmin and Tmax, and a drive voltage system according to the set torque command Tm * and the rotation speed Nm of the motor 32 The target voltage VHtag of the power line 42 is limited by the allowable upper limit voltage VHlim, the voltage command VH * is set, and the set torque is set. The transistors T11 to T16 of the inverter 34 are switched so that the motor 32 is driven by the command Tm *, and the transistors T31 and T32 of the boost converter 40 are switched so that the voltage VH of the drive voltage system power line 42 becomes the voltage command VH *. Control. As the maximum allowable voltage VHmax, a voltage that is predetermined as a voltage equal to or lower than the withstand voltage of the capacitor 46 can be used.

  Next, the operation of the electric vehicle 20 according to the embodiment configured as described above, particularly the operation when correcting the reactor current IL (detected current ILdet) detected by the current sensor 41 will be described. FIG. 3 is a flowchart showing an example of a reactor current correction routine executed by the electronic control unit 50. This routine is repeatedly executed every predetermined time (for example, every several msec).

  When the reactor current correction routine is executed, the CPU 52 of the electronic control unit 50 firstly, the charge / discharge current Ib of the battery 36 (hereinafter referred to as a detection current Ibdet) from the current sensor 37b, the reactor L of the reactor L from the current sensor 41. Whether current IL (hereinafter referred to as detection current ILdet), device current Ih flowing through electric device 70, voltage VH of drive voltage system power line 42 is boosted by voltage boost converter 40 relative to voltage VL of battery voltage system power line 44 Data such as a boost flag F1 indicating whether or not (when boosting or not boosting), a device operation flag F2 indicating whether or not the electric device 70 is operating, and the like are input (step S100). Here, as the device current Ih flowing through the electric device 70, a value obtained by dividing the device power Ph of the electric device 70 from the power sensor 71 by the voltage Vb between the terminals of the battery 36 from the voltage sensor 37a is input. Further, the boost flag F1 is input with a value 1 set during boosting and a value 0 set during non-boosting. Further, the device operation flag F2 is set to a value set to 1 when the electrical device 70 is operating and a value set to 0 when the electrical device 70 is not operating.

  When the data is input in this way, the value of the input boost flag F1 is checked (step S110), and when the boost flag F1 is 0, that is, when there is no boost, the value of the device operation flag F2 is checked (step S120). When the device operation flag F2 is 0, that is, when the electric device 70 is not operating, the difference value α1 is calculated by subtracting the detection current Ibdet of the battery 36 from the detection current ILdet of the reactor L (step S130). When the operation flag F2 is 1, that is, when the electric device 70 is operating, the difference value α1 is obtained by subtracting the detection current Ibdet of the battery 36 from the sum of the detection current ILdet of the reactor L and the device current Ih of the electric device 70. Calculate (step S140). The processes of steps S130 and S140 are processes for calculating the deviation of the detected current ILdet of the reactor L from the current sensor 41 with respect to the detected current Ibdet of the battery 36 by the current sensor 37b, excluding the device current Ih of the electric device 70. is there.

  Then, a learning value G1 for the difference value α1 is set using the calculated difference value α1 (step S150), and the corrected reactor current ILmo is calculated by subtracting the set learning value G1 from the detected current ILdet of the reactor L. (Step S160), this routine is finished. Here, in the embodiment, the learning value G1 is set to an average value (value by simple moving average) of a predetermined number of times (for example, several times to several hundred times) of the difference value α1. In this way, by correcting the detected current ILdet using the difference value α1 to obtain the corrected reactor current ILmo, the current flowing through the reactor L can be acquired more appropriately during non-boosting. As a result, it is possible to more appropriately grasp the current and power supplied from the battery voltage system power line 44 to the drive voltage system power line 42 at the time of non-boosting. In the embodiment, as the current sensor 41, a sensor having higher responsiveness than the current sensor 37b but having a lower detection accuracy is used. Therefore, the current sensor 41 in a state where the component current Ih of the electric device 70 is excluded. It is significant to obtain the corrected reactor current ILmo by correcting the detection value by the current sensor 41 using the learning value G1 based on the difference value α1 that is a deviation of the detection value by the current sensor 37b.

  In step S110, when the boost flag F1 has a value of 1, that is, during boosting, the value of the device operation flag F2 is checked in the same manner as when the boost flag F1 has a value of 0, that is, when there is no boost (step S170). When the device operation flag F2 is 0, that is, when the electric device 70 is not operating, the difference value α2 is calculated by subtracting the detection current Ibdet of the battery 36 from the detection current ILdet of the reactor L (step S180) When the flag F1 is the value 1 and the device operation flag F2 is the value 1, that is, when the electric device 70 is operating at the time of boosting, the battery 36 is calculated from the sum of the detected current ILdet of the reactor L and the device current Ih of the electric device 70. The difference value α2 is calculated by subtracting the detected current Ibdet (step S190).

  Then, a learning value G2 for the difference value α2 is set using the calculated difference value α2 (step S200), and the corrected reactor current ILmo is calculated by subtracting the set learning value G2 from the detected current ILdet of the reactor L. (Step S210), this routine is finished. Here, in the embodiment, the learning value G2 sets an average value (a value based on a simple moving average) of a predetermined number of times (for example, several to several hundred times) of the difference value α2, similarly to the learning value G1. It was. In this way, by correcting the detected current ILdet using the difference value α2 to obtain the corrected reactor current ILmo, the current flowing through the reactor L can be acquired more appropriately. As a result, the current and power supplied from the battery voltage system power line 44 to the drive voltage system power line 42 can be grasped more appropriately during boosting. Further, at the time of boosting, the corrected reactor current ILmo thus obtained is used for adjusting the voltage VH of the driving voltage system power line 42 by the boosting converter 40, so that the driving voltage is compared with that using the detection current ILdet of the reactor L. The voltage VH of the system power line 42 can be adjusted more appropriately.

  FIG. 4 is an explanatory diagram showing an example of a temporal change in the actual current Ibact flowing through the battery 36 and the actual current ILact flowing through the reactor L when the electric device 70 is not operating. FIG. 4A shows a state during non-boosting, and FIG. 4B shows a state during boosting. When the electrical device 70 is not operating at the time of non-boosting and there is no charge / discharge of the capacitor 48, the actual current Ibact flowing through the battery 36 and the actual current ILact flowing through the reactor L are as shown in FIG. Since they are substantially equal, the difference value α1 is considered to be substantially constant. On the other hand, when the electric device 70 is not operating at the time of boosting, as shown in FIG. 4B, a ripple (pulsation) is generated in the actual current IL flowing through the reactor L by turning on and off the transistors T31 and T32 of the boosting converter 40. Therefore, the difference value α2 is considered to vary depending on the detection timing by the current sensor 41. In the embodiment, the average values of the predetermined number of difference values α1 and α2 are set as learning values G1 and G2, respectively, and the detected current ILdet of the reactor L is corrected using the set learning values G1 and G2, respectively. Since ILmo is to be calculated, if the difference value α and the learning value G are not divided (same) at the time of non-boosting or boosting, the learning value including the difference value α at the time of boosting at the time of non-boosting When the detection current ILdet of the reactor L is corrected using G, or when the detection current ILdet of the reactor L is corrected using the learning value G including the difference value α at the time of non-boosting at the time of boosting May occur, and the current flowing through the reactor L cannot be properly acquired. In contrast, in the embodiment, at the time of non-boosting, the learning value G1 is set using only the difference value α1 at the time of non-boosting to correct the detected current ILdet of the reactor L, and at the time of boosting, the difference value α2 at the time of boosting By setting the learning value G2 using only the value and correcting the detection current ILdet of the reactor L, the current of the reactor L can be acquired more appropriately.

  According to the electric vehicle 20 of the embodiment described above, the voltage VH of the drive voltage system power line 42 is not boosted with respect to the voltage VL of the battery voltage system power line 44 by the boost converter 40. The learning value G1 is set using the difference value α1 and the detected current ILdet of the reactor L is corrected using the set learning value G1, and the voltage VH of the driving voltage system power line 42 is changed to the battery voltage system power by the boost converter 40. At the time of boosting with respect to the voltage VL of the line 44, the learning value G2 is set using the difference value α2 at the time of boosting, and the detection current ILdet of the reactor L is corrected using the set learning value G2. The current of the reactor L can be acquired more appropriately.

  In the electric vehicle 20 of the embodiment, when the electric device 70 is not operating, the difference value α1 and the difference value α2 are calculated by subtracting the detection current Ibdet of the battery 36 from the detection current ILdet of the reactor L, and the electric device 70 is calculated. Is operated, the difference value α1 and the difference value α2 are calculated by subtracting the detection current Ibdet of the battery 36 from the sum of the detection current ILdet of the reactor L and the device current Ih of the electric device 70. Excluding the flowing current, the deviation of the detection current ILdet of the reactor L from the detection current Ibdet of the battery 36 can be calculated more appropriately.

  In the electric vehicle 20 of the embodiment, the same learning value G1 is set regardless of whether or not the electric device 70 is operating when not boosting, and regardless of whether or not the electric device 70 is operating when boosting. Although the same learning value G2 is set, different learning values may be set depending on whether or not the electric device 70 is operating at the time of non-boosting and at the time of boosting. That is, when the electric device 70 is not operating at the time of non-boosting, the difference value α11 is calculated by subtracting the detection current Ibdet of the battery 36 from the detection current ILdet of the reactor L, and the learning value G11 is calculated based on the calculated difference value α11. When the electric device 70 is operating when not boosted, the difference value α12 is calculated by subtracting the detected current Ibdet of the battery 36 from the sum of the detected current ILdet of the reactor L and the device current Ih of the electric device 70. A learning value G12 is set based on the calculated difference value α12, and when the electric device 70 is not operating at the time of boosting, the detection value Ibdet of the battery 36 is subtracted from the detection current ILdet of the reactor L and the difference value α21 is calculated. The learning value G21 is set based on the calculated difference value α21, and the electric device 70 is activated during boosting. When moving, the difference value α22 is calculated by subtracting the detection current Ibdet of the battery 36 from the sum of the detection current ILdet of the reactor L and the device current Ih of the electric device 70, and a learning value based on the calculated difference value α22 G22 may be set.

  In the electric vehicle 20 of the embodiment, when the electric device 70 is not in operation, the difference value α1 and the difference value α2 are calculated by subtracting the detection current Ibdet of the battery 36 from the detection current ILdet of the reactor L, and the electric device 70 is operated. In this case, the difference value α1 and the difference value α2 are calculated by subtracting the detection current Ibdet of the battery 36 from the sum of the detection current ILdet of the reactor L and the device current Ih of the electric device 70. When no electric device is connected to the power line 44 or when the electric current flowing through the electric device can be ignored even when the electric device is connected, the reactor L is the same as when the electric device 70 is not operating. The difference value α1 and the difference value α2 may be calculated by subtracting the detection current Ibdet of the battery 36 from the detected current ILdet.

  In the electric vehicle 20 according to the embodiment, the learning values G1 and G2 set average values (values based on simple moving average) of predetermined values (for example, several times to several hundred times) of the difference values α1 and α2, respectively. However, the difference values α1 and α2 may be set as they are, or an average value (a value based on a simple moving average) of the difference values α1 and α2 in a predetermined time (for example, several tens msec to several hundred msec). May be set, or an average value (value based on a weighted moving average, an exponential moving average, etc.) for a predetermined number of times or a predetermined time of the difference values α1 and α2 may be set. A median value at a predetermined number of times or a predetermined time may be set. Here, as the predetermined number of times and the predetermined time, the same value may be used at the time of non-boosting and at the time of boosting, or different values may be used. Further, the predetermined number of times and the predetermined time may be the same value when the electric device 70 is not operating or when it is operating, or may be a different value.

  In the embodiment, the present invention is applied to the electric vehicle 20 including the motor 32 capable of inputting and outputting power to the drive shaft 22 connected to the drive wheels 26a and 26b. As described above, the present invention may be applied to a hybrid vehicle 120 including the engine 122 and the motor 124 connected to the drive shaft 22 through the planetary gear mechanism 126 and the motor 32 capable of inputting / outputting power to / from the drive shaft 22. Alternatively, as illustrated in the hybrid vehicle 220 of the modified example of FIG. 6, the engine 122, the inner rotor 232 connected to the crankshaft of the engine 122, and the drive shaft 22 connected to the drive wheels 26a and 26b are connected. The outer rotor 234 and a part of the power from the engine 122 to the drive shaft 22 and the remainder The present invention may be applied to a hybrid vehicle 220 including a counter-rotor motor 230 that converts motive power into electric power and a motor 32 that can input and output power to the drive shaft 22, or may be applied to the hybrid vehicle 320 of the modified example of FIG. As illustrated, the motor 32 is attached to the drive shaft 22 via the transmission 330 and the engine 122 is connected to the rotation shaft of the motor 32 via the clutch 229, and the power from the engine 122 is used as the rotation shaft of the motor 32. And the hybrid vehicle 320 that outputs the power from the motor 32 to the drive shaft 22 via the transmission 330 and outputs the power to the drive shaft 22 via the transmission 330.

  In the embodiments, the present invention is in the form of an electric vehicle or a hybrid vehicle, but may be in the form of a vehicle other than an automobile (for example, a train) or a drive 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 battery 36 corresponds to a “secondary battery”, the motor 32 corresponds to a “motor”, the boost converter 40 corresponds to a “boost converter”, the capacitor 48 corresponds to a “capacitor”, and the battery 36. The current sensor 37b attached to the output terminal corresponds to a “battery current detection sensor”, and the current sensor 41 attached between the connection point between the transistors T31 and T32 of the boost converter 30 and the reactor L is “reactor current”. Corresponds to the “detection sensor”, and when the voltage VH of the drive voltage system power line 42 is not boosted with respect to the voltage VL of the battery voltage system power line 44 by the boost converter 40, the non-boosted difference value α1 is used. The learning value G1 is set and the detected current ILdet of the reactor L is corrected using the learning value G1 set. The electronic control unit 50 that executes the processes of steps S110 to S160 of the Kuttle current correction routine corresponds to “non-boosting correction means”, and the voltage VH of the drive voltage system power line 42 is changed by the boost converter 40 to the battery voltage system power line 44. 3 is used to set the learning value G2 using the difference value α2 at the time of boosting and to correct the detection current ILdet of the reactor L using the set learning value G2. The electronic control unit 50 that executes the processes of steps S110 and S170 to S210 of the current correction routine corresponds to the “step-up correction means”. Further, the electric device 70 corresponds to an “electric device”.

  Here, the “secondary battery” is not limited to the battery 36 configured as a lithium ion secondary battery, but a first voltage such as a nickel hydride secondary battery, a nickel cadmium secondary battery, or a lead storage battery. Any device connected to the system may be used. The “motor” is not limited to the motor 32 configured as a synchronous generator motor, and may be anything as long as it is connected to the second voltage system, such as an induction motor. The “boost converter” is not limited to the boost converter 40, and has a reactor connected to the first voltage system and can boost the voltage of the second voltage system relative to the first voltage system. Any object can be used. The “capacitor” is not limited to the capacitor 48, and any capacitor attached to the first voltage system may be used. The “battery current detection sensor” is not limited to the current sensor 37b, and any sensor can be used as long as it detects the battery current flowing in the secondary battery. The “reactor current detection sensor” is not limited to the current sensor 41 and may be any sensor as long as it detects the reactor current flowing through the reactor. “Non-boosting correction means” is a non-boosting differential value when the boosting converter 40 does not boost the voltage VH of the drive voltage power line 42 with respect to the voltage VL of the battery voltage power line 44. The learning value G1 is set using α1 and is not limited to correcting the detection current ILdet of the reactor L using the set learning value G1, and the voltage of the second voltage system is set to the first voltage by the boost converter. The first learning value is set based on the difference between the detection value by the reactor current sensor and the detection value by the battery current sensor at the time of non-boosting that is not boosted with respect to the voltage of the voltage system. Any value may be used as long as the value detected by the reactor current sensor is corrected. As the “boosting correction means”, when boosting the voltage VH of the drive voltage system power line 42 with respect to the voltage VL of the battery voltage system power line 44 by the boost converter 40, the difference value α2 at the time of boosting is used. The learning value G2 is set and the detected learning value G2 is used to correct the detection current ILdet of the reactor L. The boosting converter converts the voltage of the second voltage system to the first voltage system. The second learning value is set based on the difference between the detection value by the reactor current sensor and the detection value by the battery current sensor at the time of boosting with respect to the voltage of the current, and using the set second learning value As long as it corrects the detection value by the reactor current sensor, it does not matter.

  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 manufacturing industry of driving devices and electric vehicles.

  20 electric vehicle, 22 drive shaft, 24 differential gear, 26a, 26b drive wheel, 32 motor, 32a rotational position detection sensor, 32V, 32W current sensor, 34 inverter, 36 battery, 37a voltage sensor, 37b current sensor, 37c temperature sensor , 40 Boost converter, 41 Current sensor, 42 Drive voltage system power line, 44 Battery voltage system power line, 46, 48 Capacitor, 46a, 48a Voltage sensor, 50 Electronic control unit, 52 CPU, 54 ROM, 56 RAM, 60 Ignition Switch 61 shift lever 62 shift position sensor 63 accelerator pedal 64 accelerator pedal position sensor 65 brake pedal 66 brake pedal position sensor 68 vehicle speed sensor 70 Equipment, 71 power sensor, 120, 220, 320 hybrid vehicle, 122 engine, 124 motor, 126 planetary gear mechanism, 329 clutch, 330 transmission, D11-D16, D31, D32 diode, L reactor, T11-T16, T31 , T32 transistor.

Claims (5)

A secondary battery connected to a first voltage system; an electric motor connected to a second voltage system; and a reactor connected to the first voltage system. A drive device comprising: a boost converter capable of boosting a first voltage system; and a capacitor attached to the first voltage system,
A battery current sensor for detecting a battery current flowing in the secondary battery;
A reactor current sensor for detecting a reactor current flowing through the reactor;
The difference between the detected value by the reactor current sensor and the detected value by the battery current sensor at the time of non-boosting when the voltage of the second voltage system is not boosted with respect to the voltage of the first voltage system by the boost converter. A non-boosting correction unit that sets a first learning value based on the correction value and corrects a detection value by the reactor current sensor using the set first learning value;
When boosting the voltage of the second voltage system with respect to the voltage of the first voltage system by the boost converter, the difference between the detected value by the reactor current sensor and the detected value by the battery current sensor A boosting correction unit that sets a second learning value based on the correction value and corrects a detection value by the reactor current sensor using the set second learning value;
A drive device comprising: The drive device according to claim 1,
The non-boosting correction means includes a difference value obtained by subtracting a detection value obtained by the battery current sensor from a detection value obtained by the reactor current sensor, an average value of the difference value in a first predetermined number of times, and a first predetermined value of the difference value. Means for setting any one of average values in time as the first learning value;
The boost correction means sets any one of the difference value, an average value of the difference value at a second predetermined number of times, and an average value of the difference value at a second predetermined time as the second learning value. Is,
Drive device. The drive device according to claim 1 or 2,
An electrical device connected to the first voltage system ;
When the electric device is operating, the non-boosting correction means determines a difference between a value detected by the reactor current sensor and a device current flowing in the electric device and a value detected by the battery current sensor. A means for setting the first learning value based on:
The boosting correction means is based on a difference between a value detected by the reactor current sensor and a device current flowing in the electric device and a value detected by the battery current sensor when the electric device is operating. Means for setting the second learning value,
Drive device. The drive device according to claim 3, wherein
The non-boosting correction means has a second value obtained by subtracting the detection value by the battery current sensor from the sum of the detection value by the reactor current sensor and the device current flowing through the electric device when the electric device is operating. A means for setting, as the first learning value, one of a difference value, an average value of the second difference value at a third predetermined number of times, and an average value of the second difference value at a third predetermined time; ,
When the electric device is operating, the boost correction means is configured to calculate the second difference value, an average value of the second difference value in a fourth predetermined number of times, and a fourth difference value of the second difference value. It is means for setting any one of average values in a predetermined time as the second learning value.
Drive device. An electric vehicle comprising the drive device according to any one of claims 1 to 4 and traveling using power from the electric motor.

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