JP-7857177-B2 - Temperature control device, temperature control method, and temperature control program

JP7857177B2JP 7857177 B2JP7857177 B2JP 7857177B2JP-7857177-B2

Inventors

柏▲崎▼ 貴司
青木康明

Assignees

株式会社SOKEN
株式会社デンソー

Dates

Publication Date: 20260512
Application Date: 20220704

Claims (8)

A temperature control device (10) comprising a multiphase AC rotating electric machine (20) having an armature winding (21), an inverter (30) electrically connected to the armature winding, a control device (50) for controlling the inverter, and a refrigerant passage (40) thermally connected to at least one of the inverter and the rotating electric machine, wherein the temperature of a target member (12) thermally connected to the refrigerant passage is adjusted by adjusting the temperature of the refrigerant flowing through the refrigerant passage, The control device is A switch control unit that performs switching control of the inverter to input phase current to the armature windings of each phase, The system includes a temperature control unit that receives a temperature increase request and adjusts the temperature of the refrigerant, The switch control unit is a temperature control device that, when the temperature control unit determines to raise the temperature of the refrigerant, stops the input of the phase current to one or more phases of the armature winding, and allows the phase current to be input to the remaining three or more phases of the armature winding, thereby driving the rotating electric machine.
The temperature control device according to claim 1, wherein the switch control unit, when it stops the input of the phase current of any one or more phases, increases the remaining phase current and changes the phase of the phase current.
The temperature control device according to claim 2, wherein a voltage command value is set that specifies the phase of the phase current input to each phase of the armature winding, which does not interrupt the input of the phase current, so that the rotating magnetic field formed by the armature winding, which does not interrupt the input of the phase current, is circular in shape.
The temperature control device according to claim 3, wherein the voltage command value is determined by referring to a map based on the phase to be stopped, the required torque, and the rotational speed.
The temperature control device according to any one of claims 1 to 4, wherein the switch control unit, when stopping the input of the phase current of any one or more phases, retards the phase current of the phase one electrical angle before the phase to be stopped, and advances the phase current of the phase one electrical angle after the phase to be stopped, among the armature windings that do not stop the input of the phase current.
The temperature control device according to any one of claims 1 to 4, wherein the switch control unit changes the phase from which the input of the phase current is stopped at a predetermined change timing when stopping the input of the phase current of any one or more phases.
A temperature control method performed by the control device of a temperature control device (10), comprising a multiphase AC rotating electric machine (20) having an armature winding (21), an inverter (30) electrically connected to the armature winding, a control device (50) for controlling the inverter, and a refrigerant passage (40) thermally connected to at least one of the inverter and the rotating electric machine, wherein the temperature of a target member (12) thermally connected to the refrigerant passage is adjusted by adjusting the temperature of the refrigerant flowing through the refrigerant passage, A switch control step is performed to control the switching of the inverter and input the phase current to the armature winding of each phase, The system includes a temperature control step of inputting a temperature increase request and adjusting the temperature of the refrigerant, A temperature control method in which, in the switch control step, if it is determined in the temperature control step to raise the temperature of the refrigerant, the input of the phase current to any one or more phases of the armature winding is stopped, and the phase current is input to the remaining three or more phases of the armature winding to drive the rotating electric machine.
A temperature control program implemented by the control device of a temperature control device (10), which includes a multiphase AC rotating electric machine (20) having an armature winding (21), an inverter (30) electrically connected to the armature winding, a control device (50) that controls the inverter, and a refrigerant passage (40) thermally connected to at least one of the inverter and the rotating electric machine, wherein the temperature of a target member (12) thermally connected to the refrigerant passage is adjusted by adjusting the temperature of the refrigerant flowing through the refrigerant passage, A switch control step is performed to control the switching of the inverter and input the phase current to the armature winding of each phase, The system includes a temperature control step of inputting a temperature increase request and adjusting the temperature of the refrigerant, In the switch control step, if it is determined in the temperature control step to raise the temperature of the refrigerant, the temperature control program stops the input of the phase current to any one or more phases of the armature winding, and allows the phase current to be input to the remaining three or more phases of the armature winding, thereby driving the rotating electric machine.

Description

This invention relates to a temperature control device, a temperature control method, and a temperature control program. Conventionally, temperature control devices are known that intentionally increase power loss in an inverter connected to a motor and utilize the heat generated by this power loss to raise the temperature of a battery (see, for example, Patent Document 1). Japanese Patent Publication No. 2008-189249 A diagram showing the configuration of a temperature control device.Diagram showing the configuration of a rotating electric machine and an inverter.A block diagram illustrating the current feedback control process.A flowchart illustrating the switch control process.A diagram illustrating PWM control.A flowchart showing the temperature control process.(a) is a diagram showing the current waveform of the phase current under normal conditions, and (b) is a diagram showing the current waveform of the phase current when the phase current is stopped.A diagram showing a rotating magnetic field.This diagram shows the timing for changing the current in each phase and stopping it.A diagram showing the phase current and torque when the phase current of one phase is stopped.A diagram showing the current waveform of the phase current in another example. The following describes embodiments of the temperature control device, temperature control method, and temperature control program according to the present invention, with reference to the drawings. In this embodiment, the temperature control device, temperature control method, and temperature control program according to the present invention are applied to a vehicle (e.g., an electric vehicle or a hybrid vehicle). In the following embodiments, parts that are identical or equivalent to each other are denoted by the same reference numerals in the figures. As shown in Figure 1, the temperature control device 10 comprises a rotating electric machine 20, an inverter 30, a refrigerant passage 40 thermally connected to the inverter 30 and the rotating electric machine 20, and a control device 50 for controlling the inverter 30. The refrigerant passage 40 is also thermally connected to a storage battery 12, which is a DC power source. In this embodiment, the storage battery 12 is the component whose temperature is controlled. The battery pack 12 is, for example, a battery assembly, and its terminal voltage is, for example, several hundred volts. The battery pack 12 is, for example, a secondary battery such as a lithium-ion battery or a nickel-metal hydride battery. As shown in Figure 2, the rotating electric machine 20 is a multiphase AC synchronous motor having five phase armature windings, and is equipped with stator windings 21 as armature windings for each phase, which are connected in a star configuration. In this embodiment, the phases are U, V, W, X, and Y. The stator windings 21 for each phase are arranged with an electrical angle offset of 72°. The rotating electric machine 20 in this embodiment is a permanent magnet synchronous motor equipped with a rotor 22 as the rotor and permanent magnets as field poles. The rotating electric motor 20 is a vehicle-mounted main motor, and its rotor 22 is capable of transmitting power to the vehicle's drive wheels (not shown). The torque generated by the rotating electric motor 20 functioning as an electric motor is transmitted from the rotor 22 to the drive wheels. This causes the drive wheels to rotate. The rotating electric motor 20 may be an in-wheel motor integrated with the vehicle's wheels, or a so-called on-board motor mounted on the vehicle's body. The inverter 30 is equipped with five series connections of upper arm switches Sp and lower arm switches Sn. In this embodiment, each switch Sp and Sn is a voltage-controlled semiconductor switching element, specifically an IGBT. Therefore, the high-potential terminal of each switch Sp and Sn is the collector, and the low-potential terminal is the emitter. Freewheeling diodes Dp and Dn are connected in antiparallel to each switch Sp and Sn. In each phase, the first end of the stator winding 21 is connected to the emitter of the upper arm switch Sp and the collector of the lower arm switch Sn. The second ends of the stator windings 21 for each phase are connected at the neutral point. In this embodiment, the number of turns in the stator windings 21 for each phase is set to be the same. The collectors of the upper arm switches Sp of each phase are connected to the positive terminals of the battery 12 by the positive busbar Lp. The emitters of the lower arm switches Sn of each phase are connected to the negative terminals of the battery 12 by the negative busbar Ln. A smoothing capacitor 31 is provided between the positive busbar Lp and the negative busbar Ln. The smoothing capacitor 31 may be built into the inverter 30 or provided externally. As shown in Figure 1, the refrigerant passage 40 is formed to allow cooling water to circulate as a refrigerant, and the batt