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DE-102025121788-A1 - ELECTRIFYED VEHICLE AND METHOD FOR CONTROLLING THE SAME

DE102025121788A1DE 102025121788 A1DE102025121788 A1DE 102025121788A1DE-102025121788-A1

Abstract

Disclosed are an electrified vehicle and a method for controlling it. A drive mode of a motor is controlled based on a first switching condition with respect to a target operating point and a second switching condition with respect to the required output power of the motor and the output power of an auxiliary battery in a state in which the electrified vehicle is equipped with the auxiliary battery.

Inventors

  • Ho Sun JANG
  • Seung Hyeon Bin
  • HEE WON AN
  • Joon Ha HWANG
  • Seong Min Kim
  • Byung Oh TAK

Assignees

  • HYUNDAI MOTOR COMPANY
  • KIA CORPORATION

Dates

Publication Date
20260513
Application Date
20250604
Priority Date
20241113

Claims (20)

  1. An electrified vehicle that can be equipped with an auxiliary battery, comprising: a motor with a plurality of windings; a first inverter with a plurality of branches, each branch of the plurality of branches being connected to one end of each of the plurality of windings; a main battery connected to the first inverter; and a controller configured to selectively control a drive mode of the motor between a first drive mode in which the motor is driven solely using the output power of the main battery, and a second drive mode in which the motor is driven using the output power of the main battery and the output power of the auxiliary battery together, based on a first switching condition with respect to a target operating point according to a required motor torque and a second switching condition with respect to a required motor output power and the output power of the auxiliary battery, in a state in which the electrified vehicle is equipped with the auxiliary battery.
  2. Electrified vehicle according to Claim 1 , wherein the control drives the motor in a state in which the auxiliary battery is electrically disconnected from the motor in the first drive mode, and in the second drive mode drives the motor in a state in which the auxiliary battery is electrically connected to a node to which other ends of the plurality of windings are connected.
  3. Electrified vehicle according to Claim 1 , wherein the controller determines that the first switching condition is met, based on the fact that the target operating point is in a range below a torque limit curve is included for each engine speed.
  4. Electrified vehicle according to Claim 3 , wherein the torque limit line is contained in a region below an upper torque limit line for each speed of the motor in the first drive mode.
  5. Electrified vehicle according to Claim 1 , where the control system determines that the second switching condition is met, based on the fact that the required output power of the motor exceeds the output power of the auxiliary battery.
  6. Electrified vehicle according to Claim 1 , wherein the control system manages the drive mode of the motor so that it switches to the second drive mode when both the first switching condition and the second switching condition are met.
  7. Electrified vehicle according to Claim 1 , wherein the control system controls the drive mode of the motor so that it switches to the first drive mode if at least one of the first switching conditions and the second switching condition is not met.
  8. Electrified vehicle according to Claim 1 , further comprising a second inverter with multiple branches connected to other ends of the multiple windings and connected to the main battery, wherein the first drive mode includes a CEW mode in which the motor is driven only using the first inverter and an OEW mode in which the motor is driven via the first inverter and the second inverter.
  9. Electrified vehicle according to Claim 8 , further comprising a plurality of switches, wherein one end of each switch is connected to the other end of each of the plurality of windings and the other ends of the switches are connected to each other to form a node, wherein the controller controls the first drive mode to switch to CEW mode or OEW mode by turning the multiple switches on and off.
  10. Electrified vehicle according to Claim 9 , wherein the control system manages the drive mode of the motor such that it switches to the second drive mode based on the first switching condition and the second switching condition being met while the motor is being controlled in CEW mode.
  11. Electrified vehicle according to Claim 1 , further comprising at least one charging switch connected between a node to which the other ends of the multiple windings are connected and an electrode of the auxiliary battery, wherein the control unit controls the drive mode of the motor in order to switch to the first or second drive mode by turning the charging switch on/off.
  12. Electrified vehicle according to Claim 11 , whereby the controller switches on the charging switch when both the first switching condition and the second switching condition are met.
  13. Electrified vehicle according to Claim 11 , wherein the controller switches off the charging switch if at least one of the first switching conditions and the second switching condition is not met.
  14. A method for controlling an electrified vehicle comprising a multi-winding motor, a first multi-branch inverter, each branch connected to one end of each of the multi-windings, and a main battery connected to the first inverter, wherein the electrified vehicle is capable of being equipped with an auxiliary battery, the method comprising: selectively controlling a drive mode of the motor between a first drive mode in which the motor is driven solely using the output power of the main battery, and a second drive mode in which the motor is driven using the output power of the main battery and the output power of the auxiliary battery together, based on a first switching condition with respect to a target operating point according to a required motor torque and a second switching condition with respect to a required motor output power and the output power of the auxiliary battery, in a state in which the electrified vehicle is equipped with the auxiliary battery.
  15. Procedure according to Claim 14 , further comprising determining that the first switching condition is met, based on the required engine torque contained within a range below a torque limit line for each engine speed.
  16. Procedure according to Claim 14 , furthermore including determining that the second switching condition is met because the required output power of the motor exceeds the output power of the auxiliary battery.
  17. Procedure according to Claim 14 , where the control involves controlling the drive mode of the motor in order to switch to the second drive mode, based on the fact that both the first Both the first switching condition and the second switching condition are fulfilled.
  18. Procedure according to Claim 14 , wherein controlling involves controlling the drive mode of the motor to switch to the first drive mode, based on at least one of the first switching condition and the second switching condition not being met.
  19. Procedure according to Claim 18 , wherein the electrified vehicle further comprises a second inverter with a plurality of branches connected to other ends of the plurality of windings and connected to the main battery, and a plurality of switches, wherein one end of each of the switches is connected to the other end of each of the plurality of windings and other ends of the switches are connected to each other to form a node, wherein the first drive mode comprises a CEW mode in which the motor is driven only using the first inverter, and an OEW mode in which the motor is driven via the first inverter and the second inverter, wherein controlling the drive mode of the motor to switch to the first drive mode comprises controlling the first drive mode to switch to the CEW mode or the OEW mode by turning the plurality of switches on/off.
  20. Procedure according to Claim 19 , wherein the control involves controlling the drive mode of the motor in order to switch to the second drive mode based on the first switching condition and the second switching condition being met while the motor is being controlled in CEW mode.

Description

BACKGROUND 1. Area The present disclosure relates to an electrified vehicle which can be equipped with an auxiliary battery in addition to a main battery, and to a method for controlling them. 2. Description of the state of the art Recently, the demand for electrified vehicles, which generate their power by driving a motor with electrical energy stored in a battery, instead of combustion engine vehicles, which generate their power by burning fossil fuels, has increased significantly due to the global trend to reduce carbon dioxide emissions. For electric vehicles, the time required to charge the battery is relatively long compared to the refueling time of a vehicle with an internal combustion engine, so the maximum purely electric range that a vehicle can travel on a single full battery charge is important. The maximum all-electric range of an electrified vehicle can vary depending on the battery's voltage and capacity. Even with the same battery capacity, the voltage and charge level can vary depending on the series/parallel configuration of modules or cells. For example, the battery voltage might be the value obtained by multiplying the voltage of the individual battery cells by the number of cells connected in series, and the battery charge level might be the value obtained by multiplying the charge level of the individual battery cells by the number of cells connected in parallel. Accordingly, a method for increasing the battery voltage can be considered to increase the all-electric range. However, since the voltage rating of the motor system must also be increased when the battery voltage rises, a method for increasing the all-electric range without increasing the battery voltage must be presented. The facts described above as background technology serve only to provide a better understanding of the background of the present disclosure and should not be considered to be in accordance with the prior art, which is already known to those skilled in the art. SUMMARY Therefore, the present disclosure was made in view of the problems mentioned above, and it is an objective of the present disclosure to provide an electrified vehicle capable of efficiently utilizing the output power of an auxiliary battery, and a method for controlling the same. The objective to be achieved in the present disclosure is not limited to the objective mentioned above, and other, unmentioned objectives will be clearly understood by those skilled in the field to which the present disclosure belongs, based on the description below. According to one aspect of the present disclosure, the above and other objectives can be achieved by providing an electrified vehicle that can be equipped with an auxiliary battery, which powers a motor with a plurality of windings, a first inverter with a plurality of branches, each connected to one end of each of the plurality of windings, a main battery connected to the first inverter, and a controller configured to selectively control a drive mode of the motor between a first drive mode in which the motor is driven using only the output power of the main battery, and a second drive mode in which the motor is driven using the output power of the main battery and the output power of the auxiliary battery together, based on a first switching condition with respect to a target operating point according to a required torque of the motor and a second switching condition with respect to a required output power of the motor and the output power of the auxiliary battery in a state in which the electrified vehicle is equipped with the auxiliary battery. According to another aspect of the present disclosure, a method for controlling an electrified vehicle is provided, comprising a motor with multiple windings, a first inverter with multiple branches, each connected to an end of each of the multiple windings, and a main battery connected to the first inverter and which may be equipped with an auxiliary battery, wherein the method selectively controls a drive mode of the motor between a first drive mode in which the motor is driven only using the output power of the main battery. is, and a second drive mode in which the motor is driven using the output power of the main battery and the output power of the auxiliary battery together, based on a first switching state in relation to a target operating point according to a required torque of the motor and a second switching state in relation to a required output power of the motor and the output power of the auxiliary battery in a state in which the electrified vehicle is equipped with the auxiliary battery. BRIEF DESCRIPTION OF THE DRAWINGS The above and other tasks, features and other advantages of the present disclosure will be more clearly understood from the following detailed description in conjunction with the accompanying drawings, in which: 1 a diagram showing a configuration of an electrified vehicle according to an embodiment of the present disclosure; 2 a d