KR-20260063555-A - INVERTOR CONTROLLING APPARATUS, INVERTOR CONTROLLING METHOD THEREOF AND VEHICLE COMPRISING THE SAME

KR20260063555AKR 20260063555 AKR20260063555 AKR 20260063555AKR-20260063555-A

Abstract

The present invention relates to inverter control technology, and more specifically, to an inverter control device capable of reducing the inverter junction temperature by minimizing the maximum value of the phase current flowing through the inverter, an inverter control method thereof, and a vehicle including the same. An inverter control device according to an embodiment of the present invention may include: a current command output module that outputs a current command corresponding to an input torque command; a current command conversion module that receives the current command and zero-sequence current command, and outputs a phase-converted current command by phase-converting the current command; a switching determination module that outputs a control signal based on an input motor rotation speed and the torque command; and the switching module that selectively outputs one of the current command and the phase-converted current command in response to the control signal.

Inventors

고영수
신호준
채영호
박주영
고영주

Assignees

현대자동차주식회사
기아 주식회사

Dates

Publication Date: 20260507
Application Date: 20241030

Claims (19)

A current command output module that outputs a current command corresponding to an input torque command; A current command conversion module that receives the above current command and zero-sequence current command, and outputs a phase-converted current command by phase-converting the above current command; A switching determination module that outputs a control signal based on the input motor rotation speed and the torque command; and An inverter control device comprising a switching module that selectively outputs one of the current command and the phase conversion current command in response to the above control signal.
In claim 1, An inverter control device in which the average of the minimum phase value and the maximum phase value of the above phase conversion current command is 0A.
In claim 1, An inverter control device in which the above current command conversion module generates a phase current command based on the above current command and the above zero-sequence current command, and generates a phase-converted phase current command by converting the phase of the above phase current command by the average of the maximum phase value and the minimum phase value of the above phase current command.
In claim 3, The above current command conversion module is an inverter control device that outputs the phase conversion current command by converting the phase conversion phase current command to a coordinate axis.
In claim 1, The above current command conversion module is, A first coordinate axis transformation module that generates a phase current command based on the above current command and the above image component current command; A minimum/maximum determination module that determines a minimum phase value and a maximum phase value based on the above-mentioned phase current command; An average determination module for determining the average of the minimum phase value and the maximum phase value; and An inverter control device comprising a phase conversion module that generates a phase conversion phase current command by converting the phase of the phase current command based on the average of the minimum phase value and the maximum phase value.
In claim 5, The above phase conversion module is an inverter control device that shifts the phase of the above phase current command by the average of the minimum phase value and the maximum phase value.
In claim 5, An inverter control device in which the average of the minimum phase value and the maximum phase value of the above-mentioned phase conversion phase current command is 0A.
In claim 1, The above-mentioned conversion determination module is, A control mode determination module that determines a control mode based on the motor rotation speed and the torque command, and outputs a control mode signal corresponding to the determined control mode; and An inverter control device comprising a control signal output module that outputs the control signal in response to the above control mode signal.
In claim 8, An inverter control device comprising a control mode determination module including a control mode table including a first control mode signal or a second control mode signal set according to the motor rotation speed and the torque command.
In claim 9, An inverter control device wherein the control mode determination module outputs the first control mode signal to cause the switching module to output the current command, and outputs the second control mode signal to cause the switching module to output the phase conversion current command.
A step of outputting a current command corresponding to a torque command; A step of outputting a phase-converted current command by phase-converting the current command based on the above current command and zero-sequence current command; A step of outputting a control signal based on the motor rotation speed and the torque command; and An inverter control method comprising the step of selectively outputting one of the current command and the phase conversion current command in response to the above control signal.
In claim 11, A step of outputting a phase voltage command corresponding to the above current command or the above phase conversion current command; and An inverter control method further comprising the step of outputting a Pulse Width Modulation (PWM) signal by modulating the above-mentioned phase voltage command.
In claim 11, The step of outputting the above phase conversion current command is, A step of generating a phase current command based on the above current command and the above zero-sequence current command; A step of determining a minimum phase value and a maximum phase value based on the above phase current command; A step of determining the average of the minimum phase value and the maximum phase value; and An inverter control method comprising the step of generating a phase-converted phase current command by converting the phase of the phase current command based on the average of the minimum phase value and the maximum phase value.
In claim 13, An inverter control method comprising: converting the phase of the above-mentioned phase current command by shifting the phase of the above-mentioned phase current command by the average of the minimum phase value and the maximum phase value.
In claim 13, An inverter control method in which the average of the minimum phase value and the maximum phase value of the phase conversion phase current command is 0A.
In claim 13, An inverter control method, wherein the step of outputting the phase conversion current command further includes the step of performing a coordinate axis transformation on the phase conversion phase current command to output the phase conversion current command.
In claim 11, The step of outputting the above control signal is, A step of determining a control mode based on the motor rotation speed and the torque command; A step of outputting a control mode signal corresponding to the above control mode; and An inverter control method comprising the step of outputting the control signal in response to the above control mode signal.
In claim 11, An inverter control method comprising the step of outputting the control signal, wherein the step of outputting the control signal includes outputting a first control mode signal to cause the switching module to output the current command, and outputting a second control mode signal to cause the switching module to output the phase conversion current command.
As a vehicle that runs on a motor as a driving source, An inverter for driving the above motor; and It includes a device for controlling the above inverter, A vehicle, wherein the above device generates a current command corresponding to a torque command, receives the current command and the zero-sequence current command, generates a phase-shifted current command by phase-shifting the current command, and selectively outputs one of the current command and the phase-shifted current command based on the motor rotation speed and the torque command.

Description

Inverter control apparatus, inverter control method thereof, and vehicle comprising the same The present invention relates to inverter control technology, and more specifically, to an inverter control device capable of reducing the inverter junction temperature by minimizing the maximum value of the phase current flowing through the inverter, an inverter control method thereof, and a vehicle including the same. Maximum Torque Per Ampere (MTPA) control used in driving Permanent Magnet Synchronous Motors (PMSM) is a technique that generates maximum torque by supplying the minimum three-phase balanced current. Since it uses the minimum current to generate the same torque, it can increase the efficiency of the motor by minimizing copper loss. However, when MTPA control is applied in a situation where torque is continuously output while the motor is in a stationary state or in an extremely low-speed rotational state (e.g., a hill hold state to prevent slippage without braking on an uphill road), the current flowing through the motor may be concentrated in one of the three phases depending on the electric angle of the motor, and heat generation may be unevenly distributed to the power module conducting the current of the concentrated phase, which may become significantly higher than the junction temperature of the other phases. Therefore, a technology is required that can reduce the overheating occurring in the power module by reducing the magnitude of the current concentrated in one phase in a hill hold state. Such background technology is technical information that the inventor possessed for the derivation of the present invention or acquired during the process of deriving the present invention, and it cannot be considered as prior art disclosed to the general public prior to the filing of the present invention. The drawings attached below are intended to aid in understanding embodiments of the present invention and provide embodiments together with a detailed description. However, the technical features of the present embodiment are not limited to specific drawings, and the features disclosed in each drawing may be combined with one another to form new embodiments. FIG. 1 is a diagram showing an example of a motor system including an inverter control device to which inverter junction temperature reduction technology according to an embodiment of the present invention is applied. FIG. 2 is a diagram showing the configuration of a controller (100) according to an embodiment of the present invention. FIG. 3 is a diagram showing the configuration of a current command conversion module (120) according to an embodiment of the present invention. FIG. 4 is a diagram showing the configuration of a switching judgment module (130) and a switching module (140) according to an embodiment of the present invention. FIG. 5 is a diagram illustrating a motor driving inverter control method according to an embodiment of the present invention. FIG. 6 is a drawing for specifically explaining step S510 of FIG. 5. FIG. 7 is a graph illustrating the limiting torque according to whether the MTPD control technology according to an embodiment of the present invention is applied. The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for describing embodiments of the present invention are exemplary, and therefore the present invention is not limited to the depicted details. Throughout the specification, the same reference numerals refer to the same components. Furthermore, in describing the present invention, if it is determined that a detailed description of related prior art could unnecessarily obscure the essence of the present invention, such detailed description is omitted. Where terms such as "includes," "has," or "is made up" are used in this specification, other parts may be added unless "only" is used. Where a component is expressed in the singular, it includes cases where it is included in the plural unless specifically stated otherwise. In interpreting the components, even if there is no separate explicit description of the error range, it is interpreted as including the error range. In the case of an explanation regarding temporal relationships, where the temporal sequence is described using terms such as "after," "following," "next," or "before," cases that are not continuous may also be included unless "immediately" or "directly" i