Inverter control device and program

Abstract

An inverter control device (70) is provided with: a determination unit that determines whether or not there is a temperature rise request for a temperature rise object; and a control unit that, when it is determined that there is a request for temperature rise, executes temperature rise control including a first mode and a second mode executed after the first mode. The first mode is a mode in which the upper arm switch section in a first specific phase, which is a part of the phases among the phases, is turned on, the upper arm switch section in a phase other than the first specific phase is turned off, and the lower arm switch section in a second specific phase, which is at least one phase other than the first specific phase among the phases, is turned on. The lower arm switch part in the phase other than the second specific phase is turned off. The second mode is a mode in which the upper arm switch section in a first specific phase among the phases is turned on, the upper arm switch sections in phases other than the first specific phase are turned off, and the lower arm switch sections in the phases are turned off.

Description

Citation of related applications

[0001] This application is based on Japanese Patent Application No. 2022-102905 filed on June 27, 2022, and the contents thereof are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to an inverter control device and a program. Background Art

[0003] Conventionally, there is a known technique for generating heat by switching control of an inverter and raising the temperature of a temperature-raising object by using the heat. For example, Patent Document 1 describes a technique for exchanging power between a rotating electric machine electrically connected to an inverter and a battery by switching control of an inverter and raising the temperature of the battery as a temperature-raising object. Prior art literature Patent Literature

[0004] Patent Document 1: Japanese Patent Application Publication No. 2014-72955 Summary of the invention

[0005] In order to quickly increase the temperature of the temperature-increasing object, it is desirable to increase the amount of heat generated by switching control of the inverter.

[0006] A main object of the present disclosure is to provide an inverter control device and a program capable of increasing the amount of heat generated by switching control of an inverter.

[0007] The present invention discloses an inverter control device, which is applicable to a system, wherein the system includes: an inverter, wherein the inverter includes a series connection body of an upper arm switch unit and a lower arm switch unit of a plurality of phases, and a diode unit connected in reverse parallel to the upper arm switch unit and the lower arm switch unit, respectively; a rotating electric machine having an armature winding electrically connected to the inverter; and a heat transfer unit that transfers at least the heat generated by the inverter to a temperature-raising object; The inverter control device comprises: A determination unit configured to determine whether there is a temperature increase request for the temperature increase object; and a control unit, wherein, when the determination unit determines that there is a temperature increase request, the control unit executes a temperature increase control including a first mode and a second mode executed after the first mode, The first mode described above is the following mode: turning on the upper arm switch unit in a first specific phase as a part of the phases, and turning off the upper arm switch units in phases other than the first specific phase; turning on the lower arm switch section in a second specific phase, which is at least one phase other than the first specific phase, and turning off the lower arm switch section in a phase other than the second specific phase, The second mode described above is the following mode: turning on the upper arm switch unit in the first specific phase among the phases, and turning off the upper arm switch units in phases other than the first specific phase; The lower arm switch section of each phase is opened.

[0008] In the present disclosure, when it is determined that there is a temperature increase request for the temperature increase target, temperature increase control including a first mode and a second mode executed after the first mode is executed.

[0009] By setting the inverter to the first mode, current flows through a closed circuit including an upper arm switch in the first specific phase, an armature winding of the rotating electrical machine, and a lower arm switch in the second specific phase, and magnetic energy is accumulated in the armature winding.

[0010] By setting the inverter to the second mode, current flows in a closed circuit including a diode portion connected in reverse parallel to the upper arm switch portion in the first specific phase, the armature winding, and the upper arm switch portion in each phase other than the first specific phase. The on-resistance of the diode portion is greater than the on-resistance of the switch portion. Therefore, the heat generated by the forward current flowing through the diode portion is greater than the heat generated by the current flowing through the turned-on switch portion. Therefore, according to the present disclosure, the heat generated by the switching control of the inverter can be increased. Therefore, by transferring the heat generated by the inverter to the temperature increase object via the heat transfer portion, the temperature of the temperature increase object can be rapidly increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The above objects, other objects, features and advantages of the present disclosure will become more apparent with reference to the accompanying drawings and the following detailed description. Figure 1 It is an overall configuration diagram of the vehicle-mounted control system according to the first embodiment. Figure 2 It is a diagram showing an outline of a cooling system as a heat transfer unit. Figure 3 This is a diagram showing the relationship between the current flowing through the turned-on switch section and the body diode and the voltage drop amount. Figure 4 It is a flowchart showing the processing procedure of temperature increase control. Figure 5 1 is a diagram showing an example of a current flow path in mode A of the switch conduction mode. Figure 6 1 is a diagram showing an example of a current flow path in mode B of the switch conduction mode. Figure 7 This is a diagram showing an example of a current flow path in mode 1 of the diode conduction mode. Figure 8 This is a diagram showing an example of a current flow path in Mode 2 of the diode conduction mode. Fig. 9 This is a diagram showing an example of a current flow path in Mode 3 of the diode conduction mode. Fig.10 This is a diagram showing an example of a current flow path in Mode 4 of the diode conduction mode. Fig.11 It is a flowchart showing the processing procedure of the temperature increase control according to the second embodiment. Fig.12 This is a diagram showing an example of a current flow path in mode 1 of the diode conduction mode. Fig.13 This is a diagram showing an example of a current flow path in Mode 2 of the diode conduction mode. Fig.14 This is a diagram showing an example of a current flow path in Mode 1 of the diode conduction mode according to the third embodiment. Fig.15 This is a diagram showing an example of a current flow path in Mode 2 of the diode conduction mode. Fig.16 This is a diagram showing an example of a current flow path in Mode 3 of the diode conduction mode. Fig.17 This is a diagram showing an example of a current flow path in Mode 4 of the diode conduction mode. Fig.18 It is a diagram showing an outline of a cooling system according to another embodiment. Fig.19 It is a diagram showing an outline of a cooling system according to another embodiment. Fig. 20 It is a diagram showing an outline of a cooling system according to another embodiment. Fig.21 It is a diagram showing an outline of a cooling system according to another embodiment. DETAILED DESCRIPTION

[0012] <First embodiment> Hereinafter, a first embodiment of the inverter control device of the present disclosure will be described with reference to the drawings. The power conversion device of this embodiment is mounted on a vehicle such as an electric vehicle or a hybrid vehicle.

[0013] like Figure 1As shown, the vehicle 10 includes a battery 20, an inverter 30 and a rotating electric machine 40. The rotating electric machine 40 is a three-phase synchronous machine, having a star-connected armature winding, namely a U-phase winding 41U, a V-phase winding 41V, a W-phase winding 41W and a rotor 42. Each phase winding 41U, 41V, 41W is arranged in a manner that each is staggered by 120° in electrical angle. The rotating electric machine 40 is, for example, a permanent magnet synchronous machine. The rotor 42 can transmit power to the drive wheels of the vehicle 10. Therefore, the rotating electric machine 40 becomes the driving power source of the vehicle 10.

[0014] The inverter 30 includes a series connection body of three corresponding upper arm switch parts SUH, SVH, SWH and lower arm switch parts SUL, SVL, SWL. The upper arm body diodes DUH, DVH, DWH, which are equivalent to the "diode part", are connected in reverse parallel to the upper arm switch parts SUH, SVH, SWH. The lower arm body diodes DUL, DVL, DWL, which are equivalent to the "diode part", are connected in reverse parallel to the lower arm switch parts SUL, SVL, SWL. The N-channel MOSFET is composed of a switch part and a body diode. When the switch part is turned on, the current is allowed to flow from the drain as the high potential side terminal to the source as the low potential side terminal and the current is allowed to flow from the source to the drain. On the other hand, when the switch part is turned off, the bidirectional flow of current between the drain and the source of the switch part is blocked, and the forward flow of current in the body diode is allowed.

[0015] The first end of the U-phase winding 41U is connected to the source of the U-phase upper arm switch unit SUH and the drain of the U-phase lower arm switch unit SUL via a U-phase conductive component 32U such as a busbar. The first end of the V-phase winding 41V is connected to the source of the V-phase upper arm switch unit SVH and the drain of the V-phase lower arm switch unit SVL via a V-phase conductive component 32V such as a busbar. The first end of the W-phase winding 41W is connected to the source of the W-phase upper arm switch unit SWH and the drain of the W-phase lower arm switch unit SWL via a W-phase conductive component 32W such as a busbar. The second ends of the U-phase winding 41U, the V-phase winding 41V, and the W-phase winding 41W are connected to each other at the neutral point O. In addition, in the present embodiment, the number of turns of each phase winding 41U, 41V, and 41W is set to be the same. As a result, the inductance of each phase winding 41U, 41V, and 41W is set to be the same.

[0016] The drain of each upper arm switch unit SUH, SVH, SWH is connected to the positive terminal of the battery 20 via a positive bus bar Lp. The source of each lower arm switch unit SUL, SVL, SWL is connected to the negative terminal of the battery 20 via a negative bus bar Ln.

[0017] Inverter 30 includes capacitor 31 that connects positive-side bus Lp and negative-side bus Ln. In addition, capacitor 31 may be provided outside inverter 30.

[0018] The storage battery 20 is a battery pack composed of single cells, i.e., battery cells connected in series. The terminal voltages (e.g., rated voltages) of the battery cells constituting the battery pack are set to be the same as each other. The battery cells are, for example, secondary batteries such as lithium-ion batteries. The storage battery 20 can be charged by an external charger provided outside the vehicle 10. The external charger is, for example, a stationary charger.

[0019] The vehicle 10 includes a monitoring unit 50 . The monitoring unit 50 detects the terminal voltage, SOC, SOH, temperature, etc. of each battery cell constituting the battery 20 . The detection information of the monitoring unit 50 is input to a control device 70 included in the vehicle 10 .

[0020] The vehicle 10 includes a phase current sensor 60 and a temperature sensor 61. The phase current sensor 60 detects at least two corresponding phase currents. The phase current sensor 60 detects, for example, currents flowing in at least two corresponding conductive members among the conductive members 32U to 32W. The temperature sensor 61 detects the temperature of each switch unit SUH to SWL constituting the inverter 30. The detection values ​​of the sensors 60 and 61 are input to the control device 70.

[0021] The control device 70 is mainly composed of a microcomputer 70a, and the microcomputer 70a includes a CPU. The functions provided by the microcomputer 70a can be provided by software recorded in a physical memory device and a computer that executes the software, software alone, hardware alone, or a combination thereof. For example, in the case where the microcomputer 70a is provided by an electronic circuit as hardware, it can be provided by a digital circuit or an analog circuit including a plurality of logic circuits. For example, the microcomputer 70a executes a program stored in a non-transitory tangible storage medium (non-transitory tangible storage medium) included in the microcomputer itself as a storage unit. The program includes, for example, Figure 4 The program for the processing shown in the above description is executed by executing the program. The method corresponding to the program is executed. The storage unit is, for example, a nonvolatile memory. In addition, the program stored in the storage unit can be updated through a communication network such as the Internet such as OTA (Over The Air).

[0022] The control device 70 performs switch control of each switch constituting the inverter 30 based on the detection value of the phase current sensor 60, so as to feedback control the control amount of the rotating electric machine 40 as a command value. In the present embodiment, the control amount is torque. In each phase, the upper arm switch unit and the lower arm switch unit are alternately turned on. Through this feedback control, the rotational power of the rotor 42 is transmitted to the drive wheel, so that the vehicle 10 travels.

[0023] like Figure 2As shown, the vehicle 10 has a device for cooling the inverter 30, the rotating electric machine 40, and the battery 20 when the inverter 30 is switched on and off in order to drive the vehicle 10. Specifically, the vehicle 10 includes: a circulation path 100 for circulating cooling water; an electric water pump 101; a radiator 102; and an electric fan 103. The water pump 101 is driven by power supply to circulate cooling water. In the circulation path 100, the inverter 30, the rotating electric machine 40, and the battery 20 are sequentially arranged on the downstream side of the water pump 101.

[0024] A radiator 102 is provided between the water pump 101 and the battery 20 in the circulation path 100. The radiator 102 cools the cooling water flowing in through the circulation path 100 and supplies the cooling water to the water pump 101. The cooling water flowing in the radiator 102 is cooled by the running wind blowing toward the radiator 102 as the vehicle 10 travels and by the wind blowing toward the radiator 102 by driving the fan 103 to rotate.

[0025] The water pump 101 and the fan 103 may be driven by a control device different from the control device 70. However, in the present embodiment, it is assumed that the water pump 101 and the fan 103 are driven by the control device 70 for convenience of description.

[0026] Next, the temperature increase control of the battery 20 performed by the control device 70 is described. This control is a control to generate heat by switching control of the inverter 30 when the temperature of the battery 20 detected by the monitoring unit 50 is lower than the target temperature Ttgt when the battery 20 is charged by an external charger while the vehicle 10 is parked. The generated heat is transferred to the battery 20 via the cooling water circulating in the circulation path 100 driven by the water pump 101. The temperature increase control continues, for example, until the temperature of the battery 20 reaches the target temperature Ttgt. In addition, the driving of the water pump 101 continues at least during the execution of the temperature increase control. In addition, in the present embodiment, the circulation path 100, the cooling water circulating in the circulation path 100, and the water pump 101 are equivalent to the "heat transfer unit".

[0027] When the temperature increase control is executed, the temperature of the switch unit that performs switching in the inverter 30 increases. If the temperature increase control is continued in a state where the temperature of the switch unit is high, the reliability of the switch unit may be reduced.

[0028] Here, from Figure 3As can be seen from the current-voltage characteristics shown, the on-resistance of the body diode is larger than the on-resistance of the switch section. Therefore, the heat generated by the forward current flowing through the body diode is larger than the heat generated by the current flowing through the switched-on switch section. Therefore, in the present embodiment, by utilizing this characteristic, even if the temperature of the switch section becomes high after the start of the temperature rise control, the heat generated by the switch control of the inverter 30 can be increased as much as possible. As a result, the battery 20 is quickly heated up, and the charging time of the battery 20 using the external charger is shortened.

[0029] Figure 4 2 is a flowchart showing a processing procedure of temperature increase control executed by control device 70. This processing is executed when control device 70 determines that charging of battery 20 by an external charger is started, for example.

[0030] In step S10, it is determined whether there is a request to increase the temperature of the battery 20. In the present embodiment, when the temperature of the battery 20 detected by the monitoring unit 50 is lower than the target temperature Ttgt, it is determined that there is a request to increase the temperature. In the present embodiment, the process of step S10 corresponds to a "determination unit".

[0031] If it is determined in step S10 that there is a request for temperature increase, proceed to step S11. In step S11, the temperatures of the upper arm switch units SUH to SWH corresponding to the three detected by the temperature sensor 61 are obtained. Then, the phase with the lowest temperature among the three corresponding temperatures obtained is selected as the first specific phase. In the following description, for the sake of convenience, the case where the U phase is selected as the first specific phase is described. In addition, the temperature of the upper arm switch unit in the first specific phase is referred to as the specific switch temperature Tcsw.

[0032] In step S12, it is determined whether the specific switch temperature Tcsw (specifically, the temperature of the U-phase upper arm switch unit SUH) exceeds the temperature threshold Tth. The process of step S12 is a process for determining which of the switch conduction mode and the diode conduction mode is to be executed in the temperature rise control. The temperature threshold Tth is set to a value lower than the allowable upper limit temperature that can maintain the reliability of the switch unit.

[0033] When it is determined in step S12 that the specific switch temperature Tcsw is below the temperature threshold value Tth, the process proceeds to step S13 and starts to execute the switch conduction mode. The switch conduction mode is a switch control of the inverter 30 that alternately repeats mode A and mode B. Mode A is a mode in which the upper arm switch unit in the first specific phase among the three phases is turned on, and the upper arm switch units in the phases other than the first specific phase are turned off, and the lower arm switch units in the second specific phase that is at least one phase other than the first specific phase among the phases are turned on, and the lower arm switch units in the phases other than the second specific phase are turned off. In the present embodiment, two phases are selected as the second specific phase.

[0034] Figure 5 FIG. 2 shows the current flow path in mode A when the U phase is selected as the first specific phase. Figure 5 In the diagram, the symbols of the disconnected switch parts are partially omitted, and the symbols of some structures are omitted. Figure 5 In the example shown, the upper arm switch unit SUH in the U phase as the first specific phase is turned on, and the upper arm switch units SVH and SWH in the V phase and W phase are turned off, and the lower arm switch units SVL and SWL in the V phase and W phase as the second specific phase are turned on, and the lower arm switch unit SUL in the U phase is turned off. As a result, current flows through a closed circuit including the battery 20, the U phase upper arm switch unit SUH, the U phase winding 41U, the V phase winding 41V, and the V phase lower arm switch unit SVL, and a closed circuit including the battery 20, the U phase upper arm switch unit SUH, the U phase winding 41U, the W phase winding 41W, and the W phase lower arm switch unit SWL. As a result, magnetic energy is accumulated in each phase winding 41U to 41W.

[0035] Mode B is a mode in which the upper arm switching units in the first specific phase and the second specific phase among the three phases are turned on, and the lower arm switching units among the three phases are turned off.

[0036] Figure 6 An example is shown in which the upper arm switch unit SUH in the U phase as the first specific phase and the upper arm switch units SVH and SWH in the V phase and W phase as the second specific phase are turned on, and the lower arm switch units SUL, SVL, and SWL in the U phase, V phase, and W phase are turned off. Due to the accumulated magnetic energy, current continues to flow in a closed circuit including the U-phase upper arm switch unit SUH, the U-phase winding 41U, the V-phase winding 41V, and the V-phase upper arm switch unit SVH, and a closed circuit including the U-phase upper arm switch unit SUH, the U-phase winding 41U, the W-phase winding 41W, and the W-phase upper arm switch unit SWH.

[0037] Return to previous Figure 4In step S12, if it is determined that the specific switch temperature Tcsw exceeds the temperature threshold value Tth, the process proceeds to step S14 to start the execution of the diode conduction mode. The diode conduction mode is a switching control of the inverter 30 in which a cycle of the first mode, the second mode, the third mode and the fourth mode appear in sequence is repeated. In addition, in the present embodiment, the processing of step S14 constitutes a "control unit".

[0038] The first mode is a mode in which the upper arm switch unit in a first specific phase among the three phases is turned on, and the upper arm switch units in phases other than the first specific phase are turned off, and the lower arm switch units in a second specific phase among the three phases are turned on, and the lower arm switch units in phases other than the second specific phase are turned off. Figure 7 An example is shown in which the upper arm switch unit SUH in the U phase which is the first specific phase is turned on, and the upper arm switch units SVH and SWH in the V phase and W phase other than the first specific phase are turned off, and the lower arm switch unit SVL and SWL in the V phase and W phase which are the second specific phase are turned on, and the lower arm switch unit SWL in the U phase other than the second specific phase is turned off.

[0039] The second mode is a mode in which the upper arm switching unit in the first specific phase among the three phases is turned on, the upper arm switching units in phases other than the first specific phase are turned off, and the lower arm switching units among the three phases are turned off. Figure 8 An example is shown in which the upper arm switch unit SUH in the U phase, which is the first specific phase, is turned on, and the upper arm switch units SVH and SWH in the V phase and W phase other than the first specific phase are turned off, and the lower arm switch units SUL, SVL, and SWL of the three phases are turned off. The magnetic energy accumulated in mode 1 continuously flows through a closed circuit including the U-phase upper arm switch unit SUH, the U-phase winding 41U, the V-phase winding 41V, and the V-phase upper arm body diode DVH, and a closed circuit including the U-phase upper arm switch unit SUH, the U-phase winding 41U, the W-phase winding 41W, and the W-phase upper arm body diode DWH. Unlike mode 2 of the switch conduction mode, the current does not flow through each switch unit SVH and SWH, but flows through each body diode DVH and DWH with a large on-resistance, thereby appropriately increasing the heat generation.

[0040] like Fig. 9As shown, the third mode is a mode in which the upper arm switch parts SUH, SVH, SWH of the three phases and the lower arm switch parts SUL, SVL, SWL of the three phases are disconnected. In this case, current continues to flow through a closed circuit including the battery 20, the U-phase lower arm body diode DUL, the U-phase winding 41U, the V-phase winding 41V, and the V-phase upper arm body diode DVH, and a closed circuit including the battery 20, the U-phase lower arm body diode DUL, the U-phase winding 41U, the W-phase winding 41W, and the W-phase upper arm body diode DWH. By flowing current through each body diode DUL, DVH, DWH, the heat generation can be appropriately increased.

[0041] The fourth mode is a mode in which the upper arm switching units of the three phases are turned off, the lower arm switching units in the second specific phase among the three phases are turned on, and the lower arm switching units in the phases other than the second specific phase are turned off. Fig.10 An example is shown in which the upper arm switch units SUH, SVH, and SWH of the three phases are disconnected, the lower arm switch units SVL and SWL in the V phase and W phase of the second specific phase are turned on, and the lower arm switch unit SUL of the U phase other than the second specific phase is disconnected. In this case, current continues to flow in a closed circuit including the U-phase lower arm body diode DUL, the U-phase winding 41U, the V-phase winding 41V, and the V-phase lower arm switch unit SVL, and a closed circuit including the U-phase lower arm body diode DUL, the U-phase winding 41U, the W-phase winding 41W, and the W-phase lower arm switch unit SWL. By flowing current in the U-phase lower arm body diode DUL, the heat generation can be appropriately increased.

[0042] After executing the fourth mode, the first mode is executed again. By repeating the first to fourth modes, it is possible to switch between a mode in which the current circulates between the armature winding and the upper arm side of the inverter 30 and a mode in which the current circulates between the armature winding and the lower arm side of the inverter 30. As a result, it is possible to appropriately increase the amount of heat generated while avoiding the current from concentrating on a specific switch portion.

[0043] Return to previous Figure 4 As described above, in step S15, it is determined whether the specific switch temperature Tcsw exceeds the limit temperature Tlim (>Tth). The limit temperature Tlim is a value higher than the temperature threshold Tth, for example, it is set to the same value as the above-mentioned allowable upper limit temperature, or a value slightly lower than the allowable upper limit temperature. In the execution of the switch conduction mode or the diode conduction mode, if it is determined in step S15 that the specific switch temperature Tcsw exceeds the limit temperature Tlim, the temperature rise control is stopped by stopping the switch control of each switch unit of the inverter 30. In this way, the inverter 30 is prevented from overheating abnormality.

[0044] If it is determined in step S15 that the specific switch temperature Tcsw is below the limit temperature Tlim, the process proceeds to step S16 to determine whether the temperature Tobj of the heating target reaches the target temperature Ttgt. In the present embodiment, as described above, since the heating target is the battery 20, the temperature Tobj of the heating target is the temperature of the battery 20.

[0045] If it is determined in step S16 that the temperature of the battery 20 is lower than the target temperature Ttgt, the process proceeds to step S12. On the other hand, if it is determined that the temperature of the battery 20 has reached the target temperature Ttgt, the temperature increase control is stopped. In the present embodiment, the processes of steps S11 to S16 correspond to the "control unit".

[0046] In this embodiment, the first specific phase and the second specific phase are fixed, for example, to the U phase during the period from when the affirmative determination is made in step S10 to when the temperature rise control is stopped. In this case, the rotor 42 of the rotary electric machine 40 can be prevented from rotating in accordance with the switching control of the inverter 30 while increasing the amount of heat generated.

[0047] Incidentally, during the execution of the temperature increase control, in order to suppress a decrease in the temperature of the cooling water in the circulation path 100 , the rotational drive of the fan 103 may be stopped.

[0048] According to the present embodiment described in detail above, even in a situation where a thermal restriction is imposed on the switch portion such as when the specific switch temperature Tcsw exceeds the temperature threshold value Tth, the amount of heat generated can be appropriately increased. Therefore, by transferring the heat generated by the inverter 30 and the rotating electric machine 40 (for example, the armature winding) to the battery 20 via the circulation path 100, the battery 20 can be quickly heated. As a result, the charging time of the battery 20 can be shortened.

[0049] <Second embodiment> Hereinafter, the second embodiment will be described with reference to the accompanying drawings, centering on the differences from the first embodiment. In this embodiment, when the specific switch temperature Tcsw exceeds the limit temperature Tlim during the execution of the temperature rise control, the phase with the lower temperature of the upper arm switch unit of the remaining two phases is selected as the first specific phase.

[0050] Fig.11 2 is a flowchart showing the processing steps of the temperature increase control executed by the control device 70. This processing is executed, for example, when the control device 70 determines that the battery 20 is to be charged by the external charger. Fig.11 For convenience, Figure 4 The same processes are denoted by the same reference numerals.

[0051] If it is determined in step S15 that the specific switch temperature Tcsw exceeds the limit temperature Tlim, the process proceeds to step S17. In step S17, it is determined whether the temperature of the upper arm switch unit of the three phases exceeds the limit temperature Tlim. If a positive determination is made in step S17, the temperature rise control is stopped by stopping the switching control of each switch unit of the inverter 30.

[0052] On the other hand, if it is determined in step S17 that the temperature of the upper arm switch unit of at least one phase is below the limit temperature Tlim, the process proceeds to step S11. In step S11, the phase with the lowest temperature among the temperatures of the upper arm switch units SUH to SWH of the three phases is selected as the first specific phase. The temperature of the upper arm switch unit in the selected first specific phase is below the limit temperature Tlim. In addition, Fig.12 The method of mode 1 when the V phase is selected as the first specific phase is shown. Fig.13 The manner of Mode 2 is shown when the V phase is selected as the first specific phase.

[0053] Incidentally, the control device 70 may also control the switching of the converter 30 so that, during the execution of the temperature increase control, the torque generated by the rotary electric machine 40 becomes a torque that does not cause the drive wheels of the stopped vehicle 10 to start rotating. In addition, the control device 70 may also apply a braking torque to the wheels through a mechanical brake device included in the vehicle 10 so that the wheels of the vehicle 10 do not start rotating during the execution of the temperature increase control.

[0054] According to the present embodiment described above, as the temperature increase control is executed, the heat generated in the inverter 30 can be dispersed in each phase.

[0055] <Third embodiment> Hereinafter, referring to the accompanying drawings, the third embodiment will be described with a focus on the differences from the first embodiment and the second embodiment. In this embodiment, during the execution of the temperature rise control, the upper arm switch unit and the lower arm switch unit in one of the three phases are maintained as disconnected. In this embodiment, the upper arm switch unit and the lower arm switch unit in the W phase are maintained as disconnected. Maintaining the disconnected state is to increase the amount of heat generated by the switch control. The reason why the amount of heat can be increased is explained by taking mode 2 as an example.

[0056] In the previous Figure 8, the current (drain current Ids) flowing through the U-phase upper arm switch unit SUH is set to I. In this case, a current of I / 2 flows through the V-phase upper arm body diode DVH and the W-phase upper arm body diode DWH, respectively. For ease of explanation, it is assumed that the on-resistance of the U-phase upper arm switch unit SUH is the same value R as the on-resistance of the V-phase upper arm body diode DVH and the W-phase upper arm body diode DWH. In this case, the total heat W1 per unit time generated by the U-phase upper arm switch unit SUH and the V-phase upper arm body diode DVH and the W-phase upper arm body diode DWH is expressed by the following formula (eq1).

[0057] [Mathematical formula 1] on the other hand, Fig.15 The mode 2 of this embodiment is shown. In this case, a current of I flows through the V-phase upper arm body diode DVH. The total heat W2 generated per unit time by the U-phase upper arm switch unit SUH and the V-phase upper arm body diode DVH is expressed by the following equation (eq2).

[0058] [Mathematical formula 2] W2=(R×I 2 )+(R×I 2 )=2RI 2 ...(eq2) Since W2>W1, the amount of heat generated in this embodiment becomes larger. Figure 14 to Figure 17 The forms of Modes 1 to 4 in the diode conduction mode of this embodiment are shown.

[0059] Incidentally, even in the switch-on mode, the upper arm switching section and the lower arm switching section in one phase among the three phases may be maintained OFF.

[0060] According to the present embodiment described above, the amount of heat generated by the temperature increase control can be further increased.

[0061] <Other embodiments> In addition, each of the above-mentioned embodiments may be implemented with the following modifications.

[0062] As a cooling device, not limited to Figure 2 For example, it is also possible to Fig.18 As shown, the rotating electrical machine 40 is removed from the cooling object, or as Fig.19As shown, the battery 20 is removed from the cooling target. When the battery 20 is removed from the cooling target, the temperature increase target of the temperature increase control may be set to, for example, the cooling water in the circulation path 100. When the vehicle includes an air conditioner that uses the cooling water as a heat source for heating the vehicle interior, the temperature of the heating heat source can be rapidly increased by the temperature increase control.

[0063] In addition, the cooling device may also be Fig. 20 The cooling device shown in FIG. 1 includes a bypass path 110 , a first valve portion 120 , a second valve portion 121 , a main temperature sensor 122 , and a bypass temperature sensor 123 . The first valve portion 120 and the second valve portion 121 are driven by a control device 70 .

[0064] The first valve section 120 is provided between the inverter 30 and the battery 20 in the circulation path 100. The bypass path 110 is connected to the circulation path 100 in a manner that bypasses the first valve section 120. In the bypass path 110, the second valve section 121, the bypass temperature sensor 123, and the rotating electric machine 40 are provided in sequence from the upstream side. The bypass temperature sensor 123 detects the temperature of the cooling water between the second valve section 121 in the bypass path 110 and the rotating electric machine 40. The main temperature sensor 122 is provided between the inverter 30 and the radiator 102 in the circulation path 100, and detects the temperature of the cooling water. The detection values ​​of the main temperature sensor 122 and the bypass temperature sensor 123 are input to the control device 70.

[0065] During the execution of the temperature increase control, when it is determined that the temperature of the cooling water detected by the main temperature sensor 122 (hereinafter referred to as the main temperature Tm) is higher than the temperature of the cooling water detected by the bypass temperature sensor 123 (hereinafter referred to as the bypass temperature Ts), the control device 70 opens the first valve portion 120 and closes the second valve portion 121. As a result, the flow of the cooling water in the second valve portion 121 portion of the bypass path 110 is blocked by the second valve portion 121, and the cooling water does not flow through the bypass path 110. As a result, the temperature increase control can suppress the heat generated by the inverter 30 from being absorbed by the rotating electric machine 40 via the cooling water, which helps to improve the temperature increase capability of the battery 20.

[0066] After that, the temperature rise control is continued, and when the control device 70 determines that the main temperature Tm is lower than the bypass temperature Ts, the first valve portion 120 is closed and the second valve portion 121 is opened. As a result, the flow of cooling water in the first valve portion 120 portion of the circulation path 100 is blocked by the first valve portion 120, and the cooling water flows through the bypass path 110. As a result, the heat generated by the inverter 30 and the rotating electric machine 40 can be transferred to the cooling water through the temperature rise control, which helps to improve the temperature rise capability of the battery 20.

[0067] In addition, as a cooling device, it is also possible to use Fig.21 The cooling device shown is used instead of Fig. 20 In this case, the bypass temperature sensor 123 detects the temperature of the cooling water between the second valve portion 121 in the bypass path 110 and the inverter 30. The main temperature sensor 122 detects the temperature of the cooling water between the connection portion connected to the bypass path 110 in the circulation path 100 and the radiator 102. In addition, Fig.21 In the case of the control device 70, the first valve part 120 and the second valve part 121 are driven by Fig. 20 The same method can be used to drive the same situation.

[0068] The heat transfer unit is not limited to the one using cooling water as the cooling fluid, and may be, for example, an air-cooling type heat transfer unit using gas (air) as the cooling fluid.

[0069] ·exist Figure 2 , Figure 18 to Figure 21 In the circuit path of the inverter, the rotating electrical machine, the battery, and the electrical equipment electrically connected to the battery, the arrangement order is not limited to the diagram. Figure 2 In the structure shown, the water pump → inverter → battery → rotating motor may be arranged in this order.

[0070] In addition, in an electric drive system including two rotating motors (a first rotating motor and a second rotating motor) and inverters (a first inverter and a second inverter) electrically connected to each rotating motor, the system can be configured in the order of water pump → first inverter → first rotating motor → second inverter → second rotating motor → battery, for example.

[0071] Furthermore, when the system includes a DCDC converter as the above-mentioned electric device, for example, the system may be arranged in the order of water pump→DCDC converter→inverter→rotating electric machine→battery.

[0072] In the diode conduction mode, instead of using the third mode and the fourth mode, the first mode and the second mode may be repeatedly executed alternately.

[0073] In the diode conduction mode, the fourth mode may not be used, but the switching control of the inverter 30 may be repeated in a cycle in which the first mode, the second mode, and the third mode appear in sequence. Even in this case, the heat generation can be appropriately increased, and the charging time of the battery 20 can be shortened.

[0074] An external flyback diode may be connected in reverse parallel to an N-channel MOSFET having a switch section and a body diode. In this case, the body diode and the flyback diode correspond to the "diode section".

[0075] · The rotating electrical machine is not limited to star connection, but can also be a delta connection. In addition, the rotating electrical machine and inverter are not limited to three-phase, but can also be two-phase or four-phase or more.

[0076] The power storage unit connected to the inverter is not limited to a battery, and may include, for example, a large-capacity electric double layer capacitor, or both a battery and an electric double layer capacitor.

[0077] The mobile object on which the inverter control device is installed is not limited to a vehicle, and may be, for example, an airplane or a ship. In addition, the installation location of the inverter control device is not limited to a mobile object, and may be a stationary device.

[0078] ·The control unit and the method thereof described in the present disclosure may also be implemented by a special-purpose computer, which is provided by constituting a processor and a memory, and the above-mentioned processor is programmed to execute one or more functions embodied by a computer program. Alternatively, the control unit and the method of the control unit described in the present disclosure may be implemented by a special-purpose computer, which is provided by constituting a processor composed of one or more special-purpose hardware logic circuits. Alternatively, the control unit and the method of the control unit described in the present disclosure may be implemented by one or more special-purpose computers, which are constituted by a combination of a processor and a memory programmed to execute one or more functions and a processor constituted by one or more hardware logic circuits. In addition, the computer program may also be stored in a computer-readable non-temporary tangible storage medium as an instruction executed by a computer.

[0079] Although the present disclosure is described based on the embodiments, it should be understood that the present disclosure is not limited to the above-mentioned embodiments and structures. The present disclosure also includes various modifications and modifications within the equivalent range. In addition, various combinations and methods, and other combinations and methods containing only one element, above or below them, also belong to the scope and thought range of the present disclosure.

[0080] Hereinafter, characteristic structures extracted from the above-mentioned embodiments will be described. [Structure 1] An inverter control device, the inverter control device (70) is suitable for a system, the system comprising: An inverter (30), the inverter comprising a series connection body of upper arm switch parts (SUH-SWH) and lower arm switch parts (SUL-SWL) of a plurality of phases, and diode parts (DUH-DWL) respectively connected in reverse parallel to the upper arm switch parts and the lower arm switch parts; A rotating electrical machine (40), the rotating electrical machine having an armature winding (41U-41W) electrically connected to the inverter; and A heat transfer unit (100, 101) is configured to transfer at least the heat generated by the inverter to a temperature-raising object. The inverter control device comprises: A determination unit configured to determine whether there is a temperature increase request for the temperature increase object; and a control unit, wherein, when the determination unit determines that there is a temperature increase request, the control unit executes a temperature increase control including a first mode and a second mode executed after the first mode, The first mode described above is the following mode: turning on the upper arm switch unit in a first specific phase as a part of the phases, and turning off the upper arm switch units in phases other than the first specific phase; turning on the lower arm switch section in a second specific phase, which is at least one phase other than the first specific phase, and turning off the lower arm switch section in a phase other than the second specific phase, The second mode described above is the following mode: turning on the upper arm switch unit in the first specific phase in each phase, and turning off the upper arm switch unit in phases other than the first specific phase; The lower arm switch section of each phase is opened. [Structure 2] The inverter control device as described in Structure 1, wherein: The temperature rise control includes the first mode, the second mode, the third mode and the fourth mode. The control unit repeatedly executes a cycle in which the first mode, the second mode, the third mode and the fourth mode appear in sequence during the temperature rise control. The third mode is a mode in which the upper arm switch unit of each phase and the lower arm switch unit of each phase are turned off. The fourth mode mentioned above is the following mode: Disconnecting the lower arm switch portion of each phase; The lower arm switching portion in the second specific phase among the phases is turned on, and the lower arm switching portion in the phases other than the second specific phase is turned off. [Structure 3] The inverter control device as described in Structure 1, wherein: The temperature rise control includes the first mode, the second mode and the third mode. The control unit repeatedly executes a cycle in which the first mode, the second mode, and the third mode appear in sequence during the temperature rise control. The third mode is a mode in which the upper arm switching unit of each phase and the lower arm switching unit of each phase are turned off. [Structure 4] The inverter control device as described in structure 2 or 3, wherein: The control unit repeatedly executes the one cycle while the first specific phase and the second specific phase are fixed. [Structure 5] The inverter control device as described in structure 2 or 3, wherein: The control unit selects, during the temperature increase control, a phase in which the temperature of the upper arm switching unit is the lowest among the phases as the first specific phase. [Structure 6] An inverter control device as described in any one of Structures 1 to 5, wherein: The control unit maintains the upper arm switching unit and the lower arm switching unit in a part of the phases in an OFF state during the temperature increase control.

Claims

1. An inverter control device, the inverter control device (70) being applicable to a system, the system comprising: An inverter (30) comprising a series connection of upper arm switch parts (SUH to SWH) and lower arm switch parts (SUL to SWL) of a plurality of phases, and diode parts (DUH to DWL) respectively connected in reverse parallel to the upper arm switch parts and the lower arm switch parts; A rotating electric machine (40) having an armature winding (41U-41W) electrically connected to the inverter; and a heat transfer unit (100, 101) for transferring at least the heat generated by the inverter to a temperature-raising object; The inverter control device comprises: a determination unit configured to determine whether there is a temperature increase request for the temperature increase object; and a control unit that, when the determination unit determines that there is a temperature increase request, executes a temperature increase control including a first mode and a second mode executed after the first mode, The first mode is the following mode: turning on the upper arm switch unit in a first specific phase as a part of the phases, and turning off the upper arm switch units in phases other than the first specific phase; turning on the lower arm switch portion in a second specific phase that is at least one phase other than the first specific phase among the phases, and turning off the lower arm switch portion in the phase other than the second specific phase, The second mode is the following mode: turning on the upper arm switch unit in the first specific phase among the phases, and turning off the upper arm switch units in the phases other than the first specific phase; The lower arm switch section of each phase is opened.

2. The inverter control device according to claim 1, characterized in that: The temperature increase control includes the first mode, the second mode, the third mode and the fourth mode, The control unit repeatedly executes a cycle in which the first mode, the second mode, the third mode, and the fourth mode appear in sequence during the temperature increase control. The third mode is a mode in which the upper arm switch section of each phase and the lower arm switch section of each phase are turned off. The fourth mode is the following mode: Disconnecting the lower arm switch portion of each phase; The lower arm switching portion in the second specific phase among the phases is turned on, and the lower arm switching portion in the phases other than the second specific phase is turned off.

3. The inverter control device according to claim 1, characterized in that: The temperature increase control includes the first mode, the second mode and the third mode, The control unit repeatedly executes a cycle in which the first mode, the second mode, and the third mode appear in sequence during the temperature increase control. The third mode is a mode in which the upper arm switching unit of each phase and the lower arm switching unit of each phase are turned off.

4. The inverter control device according to claim 2 or 3, characterized in that: The control unit repeatedly executes the one cycle in a state where the first specific phase and the second specific phase are fixed.

5. The inverter control device according to claim 2 or 3, characterized in that: The control unit selects, in the temperature increase control, a phase in which the temperature of the upper arm switching unit is the lowest among the phases as the first specific phase.

6. The inverter control device according to any one of claims 1 to 3, characterized in that: The control unit maintains the upper arm switching unit and the lower arm switching unit in a part of the phases in an OFF state during the temperature increase control.

7. A program, wherein the program is applicable to a system, wherein the system comprises: An inverter (20) comprising a series connection body of upper arm switch parts (SUH to SWH) and lower arm switch parts (SUL to SWL) of a plurality of phases, and diode parts (DUH to DWL) respectively connected in reverse parallel to the upper arm switch parts and the lower arm switch parts; A rotating electrical machine (40), the rotating electrical machine having an armature winding (41U-41W) electrically connected to the inverter; A heat transfer unit (100, 101), the heat transfer unit at least transferring heat generated by the inverter to a temperature-raising object; as well as Computer (70a), The program causes the computer to function as a judgment unit and a control unit. The determination unit determines whether there is a temperature increase request for the temperature increase object. The control unit executes temperature increase control including a first mode and a second mode executed after the first mode when the determination unit determines that there is a temperature increase request. The first mode is the following mode: turning on the upper arm switch unit in a first specific phase as a part of the phases, and turning off the upper arm switch units in phases other than the first specific phase; turning on the lower arm switch portion in a second specific phase that is at least one phase other than the first specific phase among the phases, and turning off the lower arm switch portion in the phase other than the second specific phase, The second mode is the following mode: turning on the upper arm switch unit in the first specific phase among the phases, and turning off the upper arm switch units in the phases other than the first specific phase; The lower arm switch section of each phase is opened.

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