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KR-20260066130-A - Hybrid drive system, hybrid drive system control method, and vehicle

KR20260066130AKR 20260066130 AKR20260066130 AKR 20260066130AKR-20260066130-A

Abstract

A hybrid drive system (100), a method for controlling a hybrid drive system, and a vehicle. The hybrid drive system (100) includes an engine (1), a generator (2), a drive motor (3), and a controller (4). The controller (4) is connected to the engine (1), the generator (2), and the drive motor (3), respectively, and in the process of the hybrid drive system (100) switching from a dual-motor drive mode to a parallel mode, the controller controls the drive motor (3) to increase the torque when the generator (2) unloads torque, and controls the drive motor (3) to decrease the torque when the engine (1) loads torque, thereby making the total output torque of the hybrid drive system (100) equal to the total required torque, and the total required torque is constant.

Inventors

  • 양, 동성
  • 주, 푸탕
  • 장, 휘
  • 두안, 유보
  • 왕, 춘성

Assignees

  • 비와이디 컴퍼니 리미티드

Dates

Publication Date
20260512
Application Date
20240329
Priority Date
20230925

Claims (20)

  1. A hybrid drive system (100) comprising an engine (1), a generator (2), a drive motor (3), and a controller (4), The above controller (4) is connected to the engine (1), the generator (2), and the drive motor (3), respectively, and is configured to control the drive motor (3) to increase the torque when the generator (2) unloads torque and to control the drive motor (3) to decrease torque when the engine (1) loads torque during the process of switching the system (100) from a dual-motor drive mode to a parallel mode, so that the total output torque of the system (100) is guaranteed to be equal to the total required torque, and the total required torque is constant, system (100).
  2. In Article 1, The above system (100) further includes a gear shift mechanism (5), a differential (6), a clutch (7), a drive gear (8), and a generator gear (9); The generator (2) is selectively connected to the drive gear (8) or the generator gear (9) through the gear shift mechanism (5); The above drive gear (8) is connected to the engine (1) through the clutch (7); The generator gear (9) is connected to the engine (1); The above differential device (6) has a first end connected to the clutch (7), a second end connected to the drive motor (3), and a third end configured to be connected to the wheel (200), in a system (100).
  3. In Article 2, The above controller (4) is connected to the gear shift mechanism (5) and the clutch (7), respectively, and the controller is: In response to detecting that the above system (100) satisfies the conditions for switching from a dual-motor drive mode to a parallel mode, the generator (2) is controlled to unload torque and the drive motor (3) is controlled to increase torque so that the total output torque is equal to the total required torque of the wheel (200) - the gear shift mechanism (5) is connected to the drive gear (8); When the torque of the generator (2) is unloaded to 0, the gear shift mechanism (5) is controlled to a neutral position and the generator (2) is controlled to output reverse torque, and when the rotational speed of the generator (2) is less than or equal to a first preset rotational speed, the generator (2) is controlled to unload reverse torque; When the rotational speed of the generator (2) is 0, the gear shift mechanism (5) is controlled to be connected to the generator gear (9), and the generator (2) is configured to be controlled to load torque for starting the engine (1); When the difference between the rotational speed of the engine (1) and the target rotational speed is greater than or equal to the second preset rotational speed, the generator (2) is configured to control to unload torque - the target rotational speed is determined based on the vehicle speed, and the second preset rotational speed is less than 0 - and; A system (100) configured to ensure that when the rotational speed of the engine (1) reaches a target rotational speed, the engine (1) is started and the clutch (7) is engaged, the engine (1) is controlled to load torque and the drive motor (3) is controlled to reduce torque, thereby ensuring that the total output torque is equal to the total required torque.
  4. In Paragraph 3, The above controller (4) is configured to control the system (100) to operate in parallel mode when the torque of the engine (1) reaches a preset torque.
  5. In Article 4, The above controller (4) is: When the torque of the engine (1) reaches a preset torque, the first torque of the engine (1) and the second torque of the drive motor (3) are determined according to the current total required torque of the wheel (200); A system (100) configured to control the engine (1) to output a first torque and control the drive motor (3) to output a second torque.
  6. In Article 5, The above controller (4) is configured to determine the driving motor torque and engine torque corresponding to the current total required torque according to a preset correspondence between the total required torque, the driving motor torque, and the engine torque—determined as the second torque and the first torque, respectively; and when the engine (1) and the driving motor (3) perform torque distribution according to the correspondence, the driving efficiency of the system (100) is highest.
  7. In any one of paragraphs 3 through 6, The above controller (4) is further configured to control the gear shift mechanism (5) to a neutral position after the engine (1) is started, in a system (100).
  8. In any one of paragraphs 3 through 7, The above controller (4) is further configured to control the difference between the rotational speed of the engine (1) and the rotational speed of the wheel (200) to be within a preset rotational speed range when the rotational speed of the engine (1) reaches a target rotational speed. (System 100).
  9. In any one of paragraphs 3 through 8, The above controller (4) is: A system (100) further configured such that when the system (100) is in a dual-motor drive mode, if the remaining charge of the storage battery (300) is less than a first preset charge threshold and the vehicle speed is greater than a preset speed, or if the remaining charge is less than a second preset charge threshold and the total required power is greater than a preset power threshold, the system (100) determines that the condition is satisfied - the storage battery (300) is connected to the generator (2) and the drive motor (3), respectively.
  10. A hybrid drive system - the system comprises an engine, a generator, and a drive motor - as a control method, A method for controlling the drive motor to increase the torque when the generator unloads torque during the process of switching the system from dual-motor drive mode to parallel mode; and controlling the drive motor to decrease the torque when the engine loads torque, thereby ensuring that the total output torque of the system is equal to the total required torque, and that the total required torque is constant.
  11. In Article 10, The above system further includes a gear shift mechanism, a differential, a clutch, a drive gear, and a generator gear; The generator is selectively connected to the drive gear or the generator gear through the gear shift mechanism; The above drive gear is connected to the engine through the clutch; The above generator gear is connected to the above engine; The differential device has a first end connected to the clutch, a second end connected to the drive motor, and a third end configured to be connected to the wheel; During the process of switching the system from a dual-motor drive mode to a parallel mode, the step of controlling the drive motor to increase the torque when the generator unloads torque and controlling the drive motor to decrease the torque when the engine loads torque, thereby ensuring that the total output torque of the system is equal to the total required torque is: In response to detecting that the system satisfies the conditions for switching from a dual-motor drive mode to a parallel mode, the method controls the generator to unload torque and controls the drive motor to increase torque, thereby ensuring that the total output torque is equal to the total required torque of the wheel—the gear shift mechanism is connected to the drive gear; When the torque of the generator is unloaded to zero, the gear shift mechanism is controlled to a neutral position and the generator is controlled to output reverse torque, and when the rotational speed of the generator is less than or equal to a first preset rotational speed, the generator is controlled to unload reverse torque; A step of controlling the gear shift mechanism to connect with the generator gear when the rotational speed of the generator is 0, and controlling the generator to load torque for starting the engine; A step of controlling the generator to unload torque when the difference between the rotational speed of the engine and the target rotational speed is greater than or equal to a second preset rotational speed - the target rotational speed is determined based on the vehicle speed, and the second preset rotational speed is less than 0; A step of controlling the engine to start and engage the clutch when the rotational speed of the engine reaches the target rotational speed, controlling the engine to load torque and controlling the drive motor to reduce torque, thereby ensuring that the total output torque is equal to the total required torque. A method including
  12. In Article 11, The above method is: A method further comprising the step of controlling the system to operate in parallel mode when the torque of the engine reaches a preset torque.
  13. In Article 12, The step of controlling the system to operate in parallel mode when the torque of the engine reaches a preset torque is: A step of determining a first torque of the engine and a second torque of the drive motor according to the current total required torque of the wheel when the torque of the engine reaches a preset torque; A step of controlling the engine to output a first torque and controlling the drive motor to output a second torque. A method including
  14. In Article 13, The step of determining the first torque of the engine and the second torque of the drive motor according to the current total required torque of the wheel is: A method comprising the step of determining a driving motor torque and an engine torque corresponding to the current total required torque according to a preset correspondence relationship between the total required torque, the driving motor torque, and the engine torque—determined as a second torque and a first torque, respectively; wherein the driving efficiency of the system is highest when the engine and the driving motor perform torque distribution according to the correspondence relationship.
  15. In any one of Articles 11 to 14, The above method is: A method comprising the step of controlling the gear shift mechanism to a neutral position after the engine is started.
  16. In any one of Articles 11 to 15, The above method is: A method further comprising the step of controlling such that when the rotational speed of the engine reaches a target rotational speed, the difference between the rotational speed of the engine and the rotational speed of the wheel is within a preset rotational speed range.
  17. In any one of paragraphs 11 through 16, The above method is: A method further comprising the step of determining that the system satisfies a condition when the system is in a dual-motor drive mode, if the remaining charge of the storage battery is less than a first preset charge threshold and the vehicle speed is greater than a preset speed, or if the remaining charge is less than a second preset charge threshold and the total required power is greater than a preset power threshold—the storage battery is connected to the generator and the drive motor, respectively.
  18. In any one of Articles 10 through 17, The above method is: A step of obtaining the current power requirements of the above system; If the current power demand is greater than a first demand threshold and less than or equal to a second demand threshold, the system is controlled to operate in a dual-motor drive mode, and if the current power demand is less than or equal to a first demand threshold, the system operates in a single-motor drive mode; the output capability of the drive motor is greater than or equal to a second demand threshold; and the drive allocation of the drive motor is less than a first demand threshold, so that during the process of the system transitioning from a dual-motor drive mode to a hybrid mode, when the generator unloads torque, the drive motor has a torque margin to compensate for the torque unloaded by the generator. A method that further includes.
  19. In Article 18, The above method is: A method comprising further a step of controlling the system to operate in a hybrid mode when the current power demand is greater than a second demand threshold.
  20. In Article 19, The drive motor and the generator are each connected to a storage battery, and the hybrid mode includes a parallel mode and a 3-power-one mode; The step of controlling the above system to operate in hybrid mode is: A step of controlling the above engine to start; After the engine is started, a step of determining the target mode of the system from the parallel mode and the 3-power-one mode according to the remaining charge amount of the storage battery; Step of controlling the above system to operate in a target mode A method including

Description

Hybrid drive system, hybrid drive system control method, and vehicle Cross-reference regarding related applications The present disclosure claims priority to Chinese patent application No. 202311249378.0, filed with the National Intellectual Property Administration of China (CNIPA) on September 25, 2023, with the title of the invention "Hybrid drive system and vehicle", and Chinese patent application No. 202311246026.X, filed with the National Intellectual Property Administration of China (CNIPA) on September 25, 2023, with the title of the invention "Hybrid drive system control method, device, system, and vehicle", the entirety of which is incorporated herein by reference. field The present disclosure relates to the field of hybrid technology, and more specifically to a hybrid drive system, a hybrid drive system control method, and a vehicle. Hybrid Electric Vehicles (HEVs) emphasize power consumption while reducing reliance on Internal Combustion Engines (ICEs) due to advancements in electric technology and improvements in charging infrastructure. A typical series-parallel architecture enables the vehicle to operate efficiently in all scenarios: pure electric mode is adopted when the battery is at a high State of Charge (SoC); series mode is used at low speeds when the battery SoC is low; and hybrid mode is activated during high-speed driving. Hybrid drive systems typically include operating modes such as single-motor drive mode, dual-motor drive mode, hybrid mode, and series mode. The system switches between these modes based on the vehicle's power requirements. Among these, ensuring the vehicle's overall power requirements during the mode switching process is particularly important for enhancing the driving experience. To solve problems existing in related technologies, the present disclosure provides a hybrid drive system, a hybrid drive system control method, and a vehicle. To achieve the above objective, in a first embodiment, the present disclosure provides a hybrid drive system comprising an engine, a generator, a drive motor, and a controller. The controller is connected to the engine, generator, and drive motor, respectively, and controls the drive motor to increase torque when the generator unloads torque and to decrease torque when the engine loads torque during the system's transition from dual-motor drive mode to parallel mode. This ensures that the system's total output torque is equal to the total required torque and that the total required torque remains constant. In a second aspect, the present disclosure provides a control method for a hybrid drive system. The system comprises an engine, a generator, and a drive motor, and the method comprises: During the system transition from dual-motor drive mode to parallel mode, when the generator unloads torque, the drive motor is controlled to increase torque; and when the engine loads torque, the drive motor is controlled to decrease torque; thus, the total output torque of the system is equal to the total required torque, and the total required torque is constant. In one embodiment, the method is: It further includes obtaining the system's current power demand; If the current power demand is greater than the first demand threshold and less than or equal to the second demand threshold, the system is controlled to operate in dual-motor drive mode. When the current power demand is less than or equal to the first demand threshold, the system operates in single-motor drive mode. The output capability of the drive motor is greater than or equal to the second demand threshold, and the drive allocation of the drive motor in dual-motor drive mode is less than the first demand threshold. This ensures that, during the system's transition process from dual-motor drive mode to hybrid mode, when the generator unloads torque, the drive motor has a torque margin to compensate for the torque unloaded by the generator. In a third embodiment, the present disclosure provides a vehicle comprising the following: As a hybrid drive system, the hybrid drive system is a hybrid drive system provided in the first embodiment of the present disclosure; and Wheels. To solve the aforementioned technical problem, a generator function is implemented in which, during the transition process of the hybrid drive system from dual-motor drive mode to parallel mode, the generator unloads torque and transmits the generator's torque to the drive motor to start the engine. Here, the drive motor must withstand the torque output during the time it takes for the torque to be transmitted from the generator to the engine and output. In this way, during the mode transition process, it is ensured that the total output torque of the hybrid drive system is equal to the total required torque, thereby satisfying the vehicle's power requirements and improving the driving experience. Additional aspects and advantages of the present disclosure are provided in part in the following detailed description