Drive unit

Abstract

Even if a malfunction occurs in either the system's main relay or the DC / DC converter, the system will start up with pre-charging of the smoothing capacitor. [Solution] Under normal circumstances, the positive side relay and pre-charge relay of the system main relay are turned on to charge the high-voltage side smoothing capacitor, then the negative side relay is turned on, and the branch side smoothing capacitor is charged by the DC / DC converter, then the branch relay is turned on to start the system. If there is a malfunction in the DC / DC converter, the positive side relay and branch relay of the system main relay are turned on, and the pre-charge relay is turned on to charge the high-voltage side smoothing capacitor and the branch side smoothing capacitor, then the negative side relay is turned on to start the system.

Description

Technical Field

[0001] The present disclosure relates to a drive device, and more particularly to a drive device including an open-winding motor, a first inverter connected to one end of a three-phase coil of the open-winding motor, and a second inverter connected to the other end of the three-phase coil of the open-winding motor.

Background Art

[0002] Conventionally, as this type of drive device, there has been proposed a device including an open-winding motor, a first inverter connected to one end of a three-phase coil of the open-winding motor, and a second inverter connected to the other end of the three-phase coil of the open-winding motor (see, for example, Patent Document 1). In this drive device, by switching between single charging for charging one of the first battery and the second battery and simultaneous charging for charging both the first battery and the second battery, the two batteries can be appropriately charged.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above drive device, it often includes a system main relay and a plurality of relays for switching between single charging and simultaneous charging, and a DC / DC converter for changing the voltage between a high-voltage power line for driving and a low-voltage power line for auxiliary equipment to conduct power exchange. In this case, system startup is usually performed with pre-charging of the smoothing capacitor by the system main relay or the DC / DC converter. However, when an abnormality occurs in one of the system main relay or the DC / DC converter, there may be a case where pre-charging of the smoothing capacitor cannot be performed.

[0005] The primary purpose of the drive device of this disclosure is to enable system startup, accompanied by precharging of the smoothing capacitor, even when a malfunction occurs in either the system main relay or the DC / DC converter. [Means for solving the problem]

[0006] The drive device of this disclosure employs the following means to achieve the main objective described above.

[0007] The first drive device of this disclosure is Energy storage device, Open-wound motor and, A first inverter is connected to a high-voltage power line connected to the aforementioned energy storage device and is also connected to one end of the three-phase coil of the open-winding motor. A second inverter is connected to the aforementioned high-voltage power line and to the other end of the three-phase coil of the open-winding motor, A high-voltage side smoothing capacitor attached to the aforementioned high-voltage power line, In the high-voltage power line on the energy storage device side of the smoothing capacitor, the system main relay includes a positive-side relay attached to the positive-side line, a negative-side relay attached to the negative-side line, and a pre-charge circuit in which a pre-charge relay connected in parallel to the negative-side relay and a limiting resistor are connected in series, Auxiliary battery and A DC / DC converter is connected to a branch power line that is connected to the positive terminal line of the high-voltage power line between the energy storage device and the system main relay, and to the negative terminal line of the high-voltage power line between the system main relay and the first inverter, and to a low-voltage power line connected to the auxiliary battery, and which exchanges power between the branch power line and the low-voltage power line with a change in voltage. A branch relay attached to the aforementioned branch power line, A branch-side smoothing capacitor is attached to the branch power line between the branch relay and the DC / DC converter, A control device that controls the first inverter, the second inverter, and the DC / DC converter, and also drives and controls the relay and branch relay to the system main, A drive device equipped with, The control device is Under normal circumstances, the positive side relay and the pre-charge relay of the system main relay are turned on to charge the high-voltage side smoothing capacitor, then the negative side relay is turned on, and the DC / DC converter charges the branch side smoothing capacitor, then the branch relay is turned on to start the system. When a malfunction occurs in the DC / DC converter, the positive side relay and the branch relay of the system main relay are turned on, and the pre-charge relay is turned on to charge the high-voltage side smoothing capacitor and the branch side smoothing capacitor, and then the negative side relay is turned on to start the system. It is characterized by the following:

[0008] In the first drive unit of this disclosure, under normal circumstances, the positive-side relay and pre-charge relay of the system main relay, which is attached to the high-voltage power line connected to the energy storage device, are turned on to charge the high-voltage side smoothing capacitor attached to the high-voltage power line on the first inverter side of the system main relay, and then the negative-side relay is turned on. The DC / DC converter, which is connected to the branch power line connected to the positive-side line between the energy storage device and the system main relay and the negative-side line between the system main relay and the first inverter, and to the low-voltage power line connected to the auxiliary battery, charges the branch-side smoothing capacitor attached to the branch power line, and then the branch relay is turned on to start the system. On the other hand, when a malfunction occurs in the DC / DC converter, the positive-side relay and branch relay of the system main relay are turned on, and the pre-charge relay is also turned on to charge the high-voltage side smoothing capacitor and the branch side smoothing capacitor, and then the negative-side relay is turned on to start the system. This allows the system to start up with pre-charging of the high-voltage side smoothing capacitor and the branch side smoothing capacitor even when a malfunction occurs in the DC / DC converter.

[0009] In normal operation, to explain in more detail, the positive side relay is turned on, then the pre-charge relay is turned on to charge the high-voltage side smoothing capacitor. After the high-voltage side smoothing capacitor is fully charged, the negative side relay is turned on, then the pre-charge relay is turned off. After that, the DC / DC converter charges the branch side smoothing capacitor, and then the branch relay is turned on to start the system. If there is a malfunction in the DC / DC converter, to explain in more detail, the positive side relay and the branch relay are turned on, then the pre-charge relay is turned on to charge the high-voltage side smoothing capacitor and the branch side smoothing capacitor. After the high-voltage side smoothing capacitor and the branch side smoothing capacitor are fully charged, the negative side relay is turned on, then the pre-charge relay is turned off to start the system.

[0010] The second drive device of this disclosure is Energy storage device, Open-wound motor and, A first inverter is connected to a high-voltage power line connected to the aforementioned energy storage device and is also connected to one end of the three-phase coil of the open-winding motor. A second inverter is connected to the aforementioned high-voltage power line and to the other end of the three-phase coil of the open-winding motor, A high-voltage side smoothing capacitor attached to the aforementioned high-voltage power line, In the high-voltage power line on the energy storage device side of the smoothing capacitor, the system main relay includes a positive-side relay attached to the positive-side line, a negative-side relay attached to the negative-side line, and a pre-charge circuit in which a pre-charge relay connected in parallel to the negative-side relay and a limiting resistor are connected in series, Auxiliary battery and A DC / DC converter is connected to a branch power line that is connected to the positive terminal line of the high-voltage power line between the energy storage device and the system main relay, and to the negative terminal line of the high-voltage power line between the system main relay and the first inverter, and to a low-voltage power line connected to the auxiliary battery, and which exchanges power between the branch power line and the low-voltage power line with a change in voltage. A branch relay attached to the aforementioned branch power line, A branch-side smoothing capacitor is attached to the branch power line between the branch relay and the DC / DC converter, A control device that controls the first inverter, the second inverter, and the DC / DC converter, and also drives and controls the relay and branch relay to the system main, A drive device equipped with, The control device is Under normal circumstances, the positive side relay and the pre-charge relay of the system main relay are turned on to charge the high-voltage side smoothing capacitor, then the negative side relay is turned on, and the DC / DC converter charges the branch side smoothing capacitor, then the branch relay is turned on to start the system. When a malfunction occurs in the pre-charge relay, the positive side relay and the branch relay of the system main relay are turned on, the high-voltage side smoothing capacitor and the branch side smoothing capacitor are charged by the DC / DC converter, and then the negative side relay is turned on to start the system. It is characterized by the following:

[0011] In the second drive unit of this disclosure, under normal circumstances, the positive-side relay and pre-charge relay of the system main relay, which is attached to the high-voltage power line connected to the energy storage device, are turned on to charge the high-voltage side smoothing capacitor attached to the high-voltage power line on the first inverter side of the system main relay, and then the negative-side relay is turned on. A DC / DC converter connected to the branch power line, which is connected to the positive-side line between the energy storage device and the system main relay and the negative-side line between the system main relay and the first inverter, and to the low-voltage power line connected to the auxiliary battery, charges the branch-side smoothing capacitor attached to the branch power line, and then the branch relay is turned on to start the system. On the other hand, if there is a malfunction in the pre-charge relay, the positive-side relay and branch relay of the system main relay are turned on, and the high-voltage side smoothing capacitor and branch-side smoothing capacitor are charged by the DC / DC converter, and then the negative-side relay is turned on to start the system. As a result, even when there is a malfunction in the pre-charge relay of the system main relay, the system can be started with pre-charging of the high-voltage side smoothing capacitor and branch-side smoothing capacitor.

[0012] In normal operation, to explain in more detail, the positive side relay is turned on, then the pre-charge relay is turned on to charge the high-voltage side smoothing capacitor. After the high-voltage side smoothing capacitor is fully charged, the negative side relay is turned on, then the pre-charge relay is turned off. After that, the DC / DC converter charges the branch side smoothing capacitor, and then the branch relay is turned on to start the system. On the other hand, if there is a malfunction in the pre-charge relay, to explain in more detail, the positive side relay and the branch relay are turned on, then the DC / DC converter charges the high-voltage side smoothing capacitor and the branch side smoothing capacitor. After the high-voltage side smoothing capacitor and the branch side smoothing capacitor are fully charged, the negative side relay is turned on to start the system.

[0013] In the drive device of the present disclosure, a line connection switch is provided on the positive electrode side line of the high-voltage system power line between the first inverter and the second inverter. The control device may turn on the line connection switch before turning on the positive electrode side relay at the time of system startup. In this case, the power storage device has the first battery and the second battery, and has a plurality of relays. A series-parallel switching circuit capable of switching between series connection of the first battery and the second battery and parallel connection of the first battery and the second battery by turning on and off the plurality of relays is provided. The control device may turn on and off the plurality of relays of the series-parallel switching circuit so that the first battery and the second battery are in series connection before turning on the positive electrode side relay at the time of system startup. That is, the system is started with the first battery and the second battery connected in series. Further, in this case, the series-parallel switching circuit includes a series connection line connecting the negative electrode side terminal of the first battery and the positive electrode side terminal of the second battery, a series connection relay attached to the series connection line, a positive electrode side power line connected to the positive electrode terminal of the first battery, a negative electrode side power line connected to the negative electrode terminal of the second battery, the first inverter, the second inverter, the open winding motor, the system main relay, a first parallel connection line connecting the first battery side and the negative electrode side power line from the series connection relay of the series connection line, a first parallel connection relay attached to the first parallel connection line, a second parallel connection line connecting the positive electrode terminal of the second battery and the connection point of the second inverter of the positive electrode side power line, and a second parallel connection relay and a third parallel connection relay attached in order from the second battery side to the second parallel connection line.

Brief Description of the Drawings

[0014] [Figure 1] It is a configuration diagram showing an outline of the configuration of a drive device 20 according to an embodiment of the present disclosure. [Figure 2] It is a flowchart showing an example of system startup processing executed by an electronic control unit 60. [Figure 3] It is a flowchart showing an example of the startup process when DCDC is abnormal. [Figure 4] It is a flowchart showing an example of the startup process when SMRP is abnormal. [Figure 5] It is an explanatory diagram showing an example of the system startup sequence when it is determined that both the DC / DC converter 46 and the precharge relay SMRP are normal. [Figure 6] It is an explanatory diagram showing an example of the system startup sequence when it is determined that an abnormality has occurred in the DC / DC converter 46. [Figure 7] It is an explanatory diagram showing an example of the system startup sequence when it is determined that an abnormality has occurred in the precharge relay SMRP.

Mode for Carrying Out the Invention

[0015] Next, a mode (embodiment) for carrying out the present disclosure will be described. FIG. 1 is a configuration diagram showing an outline of the configuration of a drive device 20 as an embodiment of the present disclosure. The drive device 20 of the embodiment includes a battery 22, a first inverter 24, a second inverter 25, an open-winding motor 26, a power supply main circuit 30, an AC charging circuit 40, a DC charging circuit 50, and an electronic control unit 60.

[0016] The battery 22 has a first battery 22a and a second battery 22b configured in the same manner as the first battery 22a. The first battery 22a and the second battery 22b are configured as, for example, lithium-ion secondary batteries or nickel-metal hydride secondary batteries. The positive terminal of the first battery 22a is connected to the positive-side power line 31B, and the negative terminal of the second battery 22b is connected to the negative-side power line 31G. The negative terminal of the first battery 22a is connected to the positive terminal of the second battery 22b by a series power line 35 to which a relay DCRNN included in the configuration of the power supply main circuit 30 is attached. Therefore, by turning on the relay DCRNN, the first battery 22a and the second battery 22b function as one serially connected battery.

[0017] The first inverter 24 is connected to the positive power line 31B and the negative power line 31G to which the battery 22 is connected, and has six switching elements, transistors T11 to T16, and six diodes D11 to D16 connected in parallel to each of the six transistors T11 to T16. Transistors T11 to T16 are all made of SiC-MOSFETs (SiC - Metal Oxide Semiconductor Field Effect Transistors). Two pairs of transistors from T11 to T16 (transistor T11 and transistor T14, transistor T12 and transistor T15, transistor T13 and transistor T16) are arranged so as to be the source and sink sides with respect to the positive power line 31B and the negative power line 31G. In addition, each connection point of two pairs of transistors T11 to T16 is connected to one end of the three-phase coil (u-phase, v-phase, and w-phase coils) of the open-winding motor 26.

[0018] The second inverter 25 is connected to the first inverter 24 by the battery 22, sandwiching it between the battery 22 and the positive power line 31B and the negative power line 31G to which the battery 22 is connected. It has six switching elements, transistors T21 to T26, and six diodes D21 to D26 connected in parallel to each of the six transistors T21 to T26. The transistors T21 to T26 of the second inverter 25 are composed of SiC-MOSFETs, similar to the transistors T11 to T16 of the first inverter 24. Two pairs of transistors from T21 to T26 (transistor T21 and transistor T24, transistor T22 and transistor T25, transistor T23 and transistor T26) are arranged to be on the source side and sink side with respect to the positive power line 31B and the negative power line 31G. Furthermore, each of the connection points of the pair of transistors T21 to T26 is connected to the other end of the three-phase coil (u-phase, v-phase, and w-phase coil) of the open-wound motor 26.

[0019] The connecting switches P1 and P2 are installed between the first inverter 24 and the second inverter 25 of the positive-side power line 31B. The connecting switches P1 and P2 are composed of SiC-MOSFETs, similar to the transistors T11 to T16 of the first inverter 24 and the transistors T21 to T26 of the second inverter 25.

[0020] The open-winding motor 26 is a generator-motor configured with connection terminals at both ends of each of the three phase windings: u-phase, v-phase, and w-phase. Three connection points of a pair of transistors of the first inverter 24 are connected to one end of each of the three phase windings: u-phase, v-phase, and w-phase, and three connection points of a pair of transistors of the second inverter 25 are connected to the other end of each of the three phase windings: u-phase, v-phase, and w-phase.

[0021] In the drive device 20 of this embodiment, the open-wound motor 26 can be driven in a star configuration by switching control of transistors T11 to T16 of the first inverter 24 while the connecting switches P1 and P2 are turned off, and the transistors T21 to T23 of the upper arm of the second inverter 25 are turned on, and the transistors T24 to T26 of the lower arm are turned off. That is, by turning off the connecting switches P1 and P2 and turning on the transistors T21 to T23 of the upper arm of the second inverter 25, the u-phase, v-phase, and w-phase of the open-wound motor 26 are neutralized by the transistors T21 to T23 that are turned on, and the open-wound motor 26 is driven by the first inverter 24 as a star-connected motor. On the other hand, by switching the transistors T11 to T16 of the first inverter 24 and the transistors T21 to T26 of the second inverter 25 with the connection switches P1 and P2 turned ON, the open-wound motor 26 can be driven in a delta connection.

[0022] The main power supply circuit 30 includes a positive-side power line 31B, a negative-side power line 31G, a series power line 35, a first parallel power line 36 connecting the negative terminal of the first battery 22a to the negative-side power line 31G, and a second parallel power line 37 connecting the positive terminal of the second battery 22b to the positive-side power line 31B of the second inverter 25 (neutral point when driven in star connection). A positive-side relay SMRB is attached to the positive-side power line 31B, and a negative-side relay SMRG is attached to the negative-side power line 31G. In addition, a pre-charge circuit consisting of a pre-charge relay SMRP and a resistor R is provided in parallel with the negative-side relay SMRG on the negative-side power line 31G. These positive-side relay SMRB, negative-side relay SMRG, and pre-charge circuit constitute the system main relay. A first smoothing capacitor 32 is installed between the first inverter 24 and the system main relay of the positive power line 31B and the negative power line 31G, and a second smoothing capacitor 33 is installed on the second inverter 25 side of the positive power line 31B and the negative power line 31G.

[0023] A relay DCRNG is installed on the first parallel power line 36. On the second parallel power line 37, a relay DCRNB is installed on the second battery 22b side, and a relay DCRN is installed on the positive side power line 31B (neutral point when star-connected) on the second inverter 25 side. A third smoothing capacitor 38 is installed between relay DCRNB and relay DCRN on the second parallel power line 37 and on the negative side power line 31G.

[0024] The AC charging circuit 40 includes an AC charging power line 41 connected between the positive terminal of the battery 22 on the positive side power line 31B and relay SMRB, and between relay SMRG on the negative side power line 31G and the first inverter 24; an onboard charger (OBC) 43 connected to the AC charging power line 41 via a filter 42; an AC charging connector 45 connected to the onboard charger 43 by a power line 44; a DC / DC converter 46 connected to the AC charging power line 41 in parallel with the onboard charger 43 via a filter 42; and an auxiliary battery 48, an auxiliary 48a, and a solar panel 49 connected to the DC / DC converter 46 by a power line 47. Relay SSRB is installed on the positive side line of the AC charging power line 41, and relay SSRG is installed on the negative side line. Furthermore, an AC charging smoothing capacitor 41c is installed between the filter 42 of the AC charging power line 41 and the relays SSRB and SSRG.

[0025] The DC charging circuit 50 includes a DC charging power line 51 connected to a positive-side power line 31B and a negative-side power line 31G, and a DC charging connector 55 connected to the DC charging power line 51. A relay DCRB is attached to the positive-side line of the DC charging power line 51, and a relay DCRG is attached to the negative-side line.

[0026] The electronic control unit 60, although not shown, is configured as a microcomputer centered on a CPU. Signals from various sensors are input to the electronic control unit 60. Examples of these sensors include a voltage sensor 32v that detects the voltage VH across the terminals of the first smoothing capacitor 32, a voltage sensor 33v that detects the voltage VL across the terminals of the second smoothing capacitor 33, a voltage sensor 38v that detects the voltage VL2 across the terminals of the third smoothing capacitor 38, a voltage sensor 31v that detects the voltage VCHG across the terminals of the AC charging smoothing capacitor 41c, a current sensor 31a that detects the current Ib1 flowing through the first battery 22a, a current sensor 37a that detects the current Id flowing through the second parallel power line 37, a phase current sensor (not shown) that detects the phase currents Iu, Iv, and Iw flowing through the three phases of the open-winding motor 26, a voltage sensor (not shown) that detects the voltage Vb1 across the terminals of the first battery 22a, and a voltage sensor (not shown) that detects the voltage Vb2 across the terminals of the second battery 22b. Furthermore, the electronic control unit 60 also functions as a control device for driving the open-wound motor 26, and therefore receives drive commands and other inputs. When the drive unit 20 is mounted on a vehicle and the open-wound motor 26 is used as a motor for driving, the electronic control unit 60 may receive inputs such as accelerator opening and vehicle speed, and generate torque commands for the open-wound motor 26.

[0027] The electronic control unit 60 outputs drive control signals to each relay, switching control signals to the first inverter 24 and the second inverter 25, and drive signals to the connection switches P1 and P2. Examples of relays include the positive side relay SMRB, the negative side relay SMRG, the pre-charge relay SMRP, relay DCRNN, relay DCRNG, relay DCRNB, relay DCRN, relay SSRB, relay SSRB, relay DCRB, and relay DCRG.

[0028] In the drive device 20 of this embodiment, when the open-winding motor 26 is driven as a driving motor, the positive-side relay SMRB, negative-side relay SMRG, relay SSRB, relay SSRG, and relay DCRNN are turned ON, and relay DCRB, relay DCRG, relay DCRN, relay DCRB, and relay DCRG are turned OFF. The drive is performed by switching control of the six transistors T11 to T16 of the first inverter 24 and the transistors T21 to T26 of the second inverter 25 based on a torque command corresponding to the accelerator opening and vehicle speed V, using star connection drive or delta connection drive.

[0029] Next, the operation of the drive unit 20 of the embodiment when the system is started will be described. Figure 2 is a flowchart showing an example of the system startup process performed by the electronic control unit 60. When the system startup process is performed, the electronic control unit 60 determines whether or not there is a malfunction in the DC / DC converter 46 or the pre-charge relay SMRP (step S100). The determination of whether or not there is a malfunction in the DC / DC converter 46 or the pre-charge relay SMRP can be made based on the results of a converter malfunction diagnosis process that diagnoses a malfunction in the DC / DC converter 46 or a relay malfunction diagnosis process that diagnoses a malfunction in the pre-charge relay SMRP. If it is determined that there is a malfunction in the DC / DC converter 46, the DC / DC malfunction startup process is executed (step S200) and this process is terminated. If it is determined that there is a malfunction in the pre-charge relay SMRP, the SMRP malfunction startup process is executed (step S300) and this process is terminated. An example of the DC / DC malfunction startup process is shown in Figure 3, and an example of the SMRP malfunction startup process is shown in Figure 4. The following will be explained in order: when both the DC / DC converter 46 and the pre-charge relay SMRP are determined to be normal, when an abnormality is determined in the DC / DC converter 46, and when an abnormality is determined in the pre-charge relay SMRP. The system startup sequence when both the DC / DC converter 46 and the pre-charge relay SMRP are determined to be normal is shown in Figure 5, the system startup sequence when an abnormality is determined in the DC / DC converter 46 is shown in Figure 6, and the system startup sequence when an abnormality is determined in the pre-charge relay SMRP is shown in Figure 7.

[0030] In step S100, when it is determined that both the DC / DC converter 46 and the pre-charge relay SMRP are functioning correctly, the normal procedure is to first turn on the relay DCRNN and the connection switches P1 and P2 (step S110, sequence 1 and 2 in Figure 5). That is, the first battery 22a and the second battery 22b of the battery 22 are connected in series, and the voltage VB of the battery 22 is set to act on the first inverter 24 and the second inverter 25.

[0031] Next, the positive side relay SMRB of the system main relay is turned on (step S120, sequence 3 in Figure 5), and the pre-charge relay SMRP is turned on (step S130, sequence 4 in Figure 5). The first smoothing capacitor 32 and the second smoothing capacitor 33 (high voltage side) are charged using the power from the battery 22, which consists of the first battery 22a and the second battery 22b connected in series, and the system waits for the charging of the first smoothing capacitor 32 and the second smoothing capacitor 33 (high voltage side) to be completed (step S140).

[0032] When the first smoothing capacitor 32 and the second smoothing capacitor 33 (high voltage side) are fully charged, the negative side relay SMRG is turned on (step S150, sequence 5 in Figure 5), and the pre-charge relay SMRP is turned off (step S160, sequence 6 in Figure 5). Then the DC / DC converter 46 is activated (step S170), and the DC / DC converter 46 starts charging the AC charging smoothing capacitor 41c (charging side) using the power from the auxiliary battery 48, and waits for the AC charging smoothing capacitor 41c (charging side) to be fully charged (step S180, sequence 7 in Figure 5). When the AC charging smoothing capacitor 41c (charging side) is fully charged, relays SSRB and SSRG are turned on (step S190, sequence 8 in Figure 5), and the system startup is completed.

[0033] If it is determined in step S100 that there is an abnormality in the DC / DC converter 46, the DC / DC abnormality startup process illustrated in Figure 3 is executed. In the DC / DC abnormality startup process, the electronic control unit 60 first turns on the relay DCRNN and the connection switches P1 and P2 (step S210, sequence 1 and 2 in Figure 6). As in normal operation, the first battery 22a and the second battery 22b of the battery 22 are connected in series, and the voltage VB of the battery 22 is set to act on the first inverter 24 and the second inverter 25.

[0034] Next, the positive side relay SMRB of the system main relay is turned on (step S220, sequence 3 in Figure 6), and relays SSRB and SSRG are turned on (step S230, sequence 4 in Figure 6). Then, the pre-charge relay SMRP is turned on (step S240, sequence 5 in Figure 6), and the power from battery 22, which consists of the first battery 22a and the second battery 22b connected in series, is used to start charging the first smoothing capacitor 32, the second smoothing capacitor 33 (high voltage side), and the AC charging smoothing capacitor 41c (charging side), and the system waits for these capacitors to finish charging (step S250).

[0035] Once each capacitor has finished charging, the negative side relay SMRG is turned on (step S260, sequence 6 in Figure 6), and the pre-charge relay SMRP is turned off (step S270, sequence 7 in Figure 6), completing the system startup.

[0036] If it is determined in step S100 that there is an abnormality in the pre-charge relay SMRP, the SMRP abnormality startup process illustrated in Figure 4 is executed. In the SMRP abnormality startup process, the electronic control unit 60 first turns on the relay DCRNN and also turns on the connection switches P1 and P2 (step S310, sequence 1 and 2 in Figure 7). As in normal processing, the first battery 22a and the second battery 22b of the battery 22 are connected in series, and the voltage VB of the battery 22 is set to act on the first inverter 24 and the second inverter 25.

[0037] Next, the positive side relay SMRB of the system main relay is turned on (step S320, sequence 3 in Figure 7), and relays SSRB and SSRG are turned on (step S330, sequence 4 in Figure 7). Then, the DC / DC converter 46 is activated (step S340), and the DC / DC converter 46 starts charging the AC charging smoothing capacitor 41c (charging side) and the first smoothing capacitor 32 and second smoothing capacitor 33 (high voltage side) using the power from the auxiliary battery 48, and waits for the charging of these capacitors to be completed (step S350, sequence 5 in Figure 7).

[0038] Once each capacitor has finished charging, the negative terminal relay SMRG is turned on (step S360, sequence 6 in Figure 7), completing the system startup.

[0039] In the drive unit 20 of the embodiment described above, when both the DC / DC converter 46 and the pre-charge relay SMRP are functioning normally, the relay DCRNN is turned on, and the connection switches P1 and P2 are turned on to connect the first battery 22a and the second battery 22b of the battery 22 in series, and the voltage VB of the battery 22 is set to act on the first inverter 24 and the second inverter 25. In this state, the positive side relay SMRB of the system main relay is turned on, and the pre-charge relay SMRP is turned on to perform high-voltage charging, after which the negative side relay SMRG is turned on, and the pre-charge relay SMRP is turned off. Then, the DC / DC converter 46 is activated to charge the AC charging smoothing capacitor 41c, and after that, relays SSRB and SSRG are turned on to complete the system startup. This allows the first smoothing capacitor 32, the second smoothing capacitor 33, and the AC charging smoothing capacitor 41c to be charged and the system to start up.

[0040] On the other hand, when a malfunction occurs in the DC / DC converter 46, the relay DCRNN is turned on, and the connection switches P1 and P2 are turned on. Then, the positive side relay SMRB of the system main relay is turned on, along with relays SSRB and SSRG, and the pre-charge relay SMRP is turned on to charge the first smoothing capacitor 32, the second smoothing capacitor 33 (high voltage side), and the AC charging smoothing capacitor 41c (charging side). After that, the negative side relay SMRG is turned on, and the pre-charge relay SMRP is turned off to complete the system startup. This allows the system to start up even when a malfunction occurs in the DC / DC converter 46 by charging the first smoothing capacitor 32, the second smoothing capacitor 33, and the AC charging smoothing capacitor 41c.

[0041] Furthermore, if a malfunction occurs in the pre-charge relay SMRP, the system starts up by turning on relay DCRNN and connection switches P1 and P2, then turning on the positive side relay SMRB of the system main relay, as well as relays SSRB and SSRG, activating the DC / DC converter 46 to charge the AC charging smoothing capacitor 41c, the first smoothing capacitor 32, and the second smoothing capacitor 33, and then turning on the negative side relay SMRG to complete the system startup. This allows the system to start up by charging the first smoothing capacitor 32, the second smoothing capacitor 33, and the AC charging smoothing capacitor 41c even if a malfunction occurs in the pre-charge relay SMRP.

[0042] In the drive device 20 of this embodiment, the battery 22 has a first battery 22a and a second battery 22b, and the main power supply circuit 30 is configured so that the first battery 22a and the second battery 22b can be connected in series or in parallel. However, it may also be equipped with only a single battery.

[0043] The correspondence between the main elements of the embodiment and the main elements of the invention described in the section on means for solving the problem will be explained. In this embodiment, the battery 22 corresponds to an "energy storage device," the open-winding motor 26 corresponds to an "open-winding motor," the first inverter 24 corresponds to a "first inverter," the second inverter 25 corresponds to a "second inverter," the first smoothing capacitor 32 and the second smoothing capacitor 33 correspond to "high-voltage side smoothing capacitors," the positive-side relay SMRB corresponds to a "positive-side relay," the negative-side relay SMRG corresponds to a "negative-side relay," the pre-charge relay SMRP corresponds to a "pre-charge relay," the system main relay corresponds to a "system main relay," the auxiliary battery 48 corresponds to an "auxiliary battery," the DC / DC converter 46 corresponds to a "DC / DC converter," the relays SSRB and SSRG correspond to "branch relays," the AC charging smoothing capacitor 41c corresponds to a "branch-side smoothing capacitor," and the electronic control unit 60 corresponds to a "control device."

[0044] Furthermore, the correspondence between the main elements of the embodiment and the main elements of the invention described in the section on means for solving the problem is merely an example to specifically explain the form in which the embodiment implements the invention described in the section on means for solving the problem, and does not limit the elements of the invention described in the section on means for solving the problem. In other words, the interpretation of the invention described in the section on means for solving the problem should be based on the description in that section, and the embodiment is merely one specific example of the invention described in the section on means for solving the problem.

[0045] Although the present disclosure has been described above using embodiments, the present disclosure is not limited in any way to these embodiments, and can of course be implemented in various forms without departing from the gist of the present disclosure. [Industrial applicability]

[0046] This disclosure can be used in industries such as the manufacturing of drive systems. [Explanation of symbols]

[0047] 20 Drive unit, 22 Battery, 22a First battery, 22b Second battery, 24 First inverter, 25 Second inverter, 26 Open-wound motor, 30 Main power supply circuit, 31a Current sensor, 31B Positive side power line, 31G Negative side power line, 32 First smoothing capacitor, 32V voltage sensor, 33 Second smoothing capacitor, 33V voltage sensor, 35 Series power line, 36 First parallel power line, 37 Second parallel power line, 37a Current sensor, 38 Second capacitor, 38V voltage sensor, 40 AC charging circuit, 41 AC charging power line, 41C AC charging smoothing capacitor, 41V voltage sensor, 42 Filter, 43 Onboard charger, 44 Power line, 45 AC charging connector, 46 DC / DC converter, 47 Power line, 48 Auxiliary battery, 48a Auxiliary, 49 Solar panel, 50 DC charging circuit, 51 DC charging power line, 55 DC charging connector, 60 electronic control unit, P1, P2 connection switch, SMRB positive relay, SMRG negative relay, SMRP pre-charge relay, DCRNN, DCRNG, DCRNB, DCRN, SSRB, SSRB, DCRB, DCRG relays, T11~T16, T21~T26 transistors, D11~D16, D21~D26 diodes.

Claims

1. Energy storage device, Open-wound motor and, A first inverter is connected to a high-voltage power line connected to the aforementioned energy storage device and is also connected to one end of the three-phase coil of the open-winding motor. A second inverter is connected to the aforementioned high-voltage power line and to the other end of the three-phase coil of the open-winding motor, A high-voltage side smoothing capacitor attached to the aforementioned high-voltage power line, In the high-voltage power line on the energy storage device side of the smoothing capacitor, the system main relay includes a positive-side relay attached to the positive-side line, a negative-side relay attached to the negative-side line, and a pre-charge circuit in which a pre-charge relay connected in parallel to the negative-side relay and a limiting resistor are connected in series, Auxiliary battery and A DC / DC converter is connected to a branch power line that is connected to the positive terminal line of the high-voltage power line between the energy storage device and the system main relay, and to the negative terminal line of the high-voltage power line between the system main relay and the first inverter, and to a low-voltage power line connected to the auxiliary battery, and performs power exchange between the branch power line and the low-voltage power line with a voltage change. A branch relay attached to the aforementioned branch power line, A branch-side smoothing capacitor is attached to the branch power line between the branch relay and the DC / DC converter, A control device that controls the first inverter, the second inverter, and the DC / DC converter, and also drives and controls the system main relay and the branch relay, A drive device equipped with, The control device is Under normal circumstances, the positive side relay and the pre-charge relay of the system main relay are turned on to charge the high-voltage side smoothing capacitor, then the negative side relay is turned on, and the DC / DC converter charges the branch side smoothing capacitor, then the branch relay is turned on to start the system. When a malfunction occurs in the DC / DC converter, the positive side relay and the branch relay of the system main relay are turned on, and the pre-charge relay is turned on to charge the high-voltage side smoothing capacitor and the branch side smoothing capacitor, and then the negative side relay is turned on to start the system. A drive device characterized by the following features.

2. A drive device according to claim 1, The control device is Under normal circumstances, the positive side relay is turned on, then the pre-charge relay is turned on to charge the high-voltage side smoothing capacitor, and after the high-voltage side smoothing capacitor is fully charged, the negative side relay is turned on, then the pre-charge relay is turned off, and then the DC / DC converter charges the branch side smoothing capacitor, and then the branch relay is turned on to start the system. When a malfunction occurs in the DC / DC converter, the positive side relay and the branch relay are turned on, then the pre-charge relay is turned on to charge the high-voltage side smoothing capacitor and the branch side smoothing capacitor. After the high-voltage side smoothing capacitor and the branch side smoothing capacitor are fully charged, the negative side relay is turned on, then the pre-charge relay is turned off to start the system. Drive unit.

3. Energy storage device, Open-wound motor and, A first inverter is connected to a high-voltage power line connected to the aforementioned energy storage device and is also connected to one end of the three-phase coil of the open-winding motor. A second inverter is connected to the aforementioned high-voltage power line and to the other end of the three-phase coil of the open-winding motor, A high-voltage side smoothing capacitor attached to the aforementioned high-voltage power line, In the high-voltage power line on the energy storage device side of the smoothing capacitor, the system main relay includes a positive-side relay attached to the positive-side line, a negative-side relay attached to the negative-side line, and a pre-charge circuit in which a pre-charge relay connected in parallel to the negative-side relay and a limiting resistor are connected in series, Auxiliary battery and A DC / DC converter is connected to a branch power line that is connected to the positive terminal line of the high-voltage power line between the energy storage device and the system main relay, and to the negative terminal line of the high-voltage power line between the system main relay and the first inverter, and to a low-voltage power line connected to the auxiliary battery, and performs power exchange between the branch power line and the low-voltage power line with a voltage change. A branch relay attached to the aforementioned branch power line, A branch-side smoothing capacitor is attached to the branch power line between the branch relay and the DC / DC converter, A control device that controls the first inverter, the second inverter, and the DC / DC converter, and also drives and controls the system main relay and the branch relay, A drive device equipped with, The control device is Under normal circumstances, the positive side relay and the pre-charge relay of the system main relay are turned on to charge the high-voltage side smoothing capacitor, then the negative side relay is turned on, and the DC / DC converter charges the branch side smoothing capacitor, then the branch relay is turned on to start the system. When a malfunction occurs in the pre-charge relay, the positive side relay and the branch relay of the system main relay are turned on, the high-voltage side smoothing capacitor and the branch side smoothing capacitor are charged by the DC / DC converter, and then the negative side relay is turned on to start the system. A drive device characterized by the following features.

4. A drive device according to claim 3, The control device is Under normal circumstances, the positive side relay is turned on, then the pre-charge relay is turned on to charge the high-voltage side smoothing capacitor, and after the high-voltage side smoothing capacitor is fully charged, the negative side relay is turned on, then the pre-charge relay is turned off, and then the DC / DC converter charges the branch side smoothing capacitor, and then the branch relay is turned on to start the system. If a malfunction occurs in the pre-charge relay, the positive side relay and the branch relay are turned on, and the DC / DC converter charges the high-voltage side smoothing capacitor and the branch side smoothing capacitor. After the high-voltage side smoothing capacitor and the branch side smoothing capacitor are fully charged, the negative side relay is turned on to start the system. Drive unit.

5. A drive device according to any one of claims 1 to 4, The system includes a line connection switch attached to the positive electrode side line of the high-voltage power line between the first inverter and the second inverter, The control device, when the system starts up, turns on the line connection switch before turning on the positive side relay. Drive unit.

6. A drive device according to claim 5, The energy storage device comprises the first battery and the second battery, The device includes a series-parallel switching circuit that has multiple relays and can switch between a series connection of the first battery and the second battery and a parallel connection of the first battery and the second battery by switching the multiple relays on and off, When the system starts up, the control device turns on and off the multiple relays of the series-parallel switching circuit so that the first battery and the second battery are connected in series, before turning on the positive side relay. Drive unit.

7. The drive device according to claim 6, The series-parallel switching circuit comprises a series connection line connecting the negative terminal of the first battery and the positive terminal of the second battery; a series connection relay attached to the series connection line; a positive power line connected to the positive terminal of the first battery; a negative power line connected to the negative terminal of the second battery; a first inverter; a second inverter; an open-winding motor; a system main relay; a first parallel connection line connecting the first battery side of the series connection line from the series connection relay to the negative power line; a first parallel connection relay attached to the first parallel connection line; a second parallel connection line connecting the positive terminal of the second battery and the connection point of the second inverter on the positive power line; and a second parallel connection relay and a third parallel connection relay attached to the second parallel connection line in order from the second battery side. Drive unit.

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