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KR-102964410-B1 - SYSTEM AND METHOD FOR CONTROLLING DRIVING OF HYBRID VEHICLE

KR102964410B1KR 102964410 B1KR102964410 B1KR 102964410B1KR-102964410-B1

Abstract

The driving control system of a hybrid vehicle according to the present invention may include a hybrid control unit that, based on the vehicle's gear stage and driving state information, if it is determined that the engine is turned off while the vehicle is driving in reverse, shifts the vehicle's gear stage to a neutral stage and controls the speed of the drive motor to become 0.

Inventors

  • 문성욱
  • 김정은

Assignees

  • 현대자동차주식회사
  • 기아 주식회사

Dates

Publication Date
20260513
Application Date
20200730

Claims (12)

  1. A hybrid control unit that, based on the vehicle's gear position and vehicle driving status information, if it is determined that the engine is turned off while the vehicle is driving in reverse, shifts the vehicle's gear position to neutral and controls the speed of the drive motor to become 0; A transmission control unit that determines the current gear of the vehicle and shifts the gear according to the command of the hybrid control unit; and A motor control unit that controls the speed of the drive motor according to the command of the hybrid control unit above. Including, the hybrid control unit, A driving control system for a hybrid vehicle characterized by making the speed of the drive motor zero through the motor control unit before turning off the relay.
  2. In claim 1, A battery control unit positioned between the battery and the drive motor to turn on or off a relay that connects or disconnects the battery and the drive motor; and A driving control system for a hybrid vehicle characterized by further including one or more of an engine clutch control unit that engages or disengages the engine clutch.
  3. In claim 2, The hybrid control unit is, A driving control system for a hybrid vehicle characterized by determining whether the vehicle is currently driving in reverse based on information transmitted from a transmission control unit, and if it is determined that the vehicle's ignition is turned off while the vehicle is driving in reverse, shifting the vehicle's gear to a neutral position through the transmission control unit.
  4. In claim 3, The hybrid control unit is, A driving control system for a hybrid vehicle characterized by making the speed of the drive motor zero through the motor control unit before turning off the relay when it is confirmed through the transmission control unit that the gear stage has been shifted to the neutral stage.
  5. In claim 4, The hybrid control unit is, A driving control system for a hybrid vehicle characterized by engaging the engine clutch through the engine clutch control unit when it is confirmed that the speed of the drive motor approaches zero.
  6. In claim 4, The hybrid control unit is, A driving control system for a hybrid vehicle characterized by turning off a relay through a battery control unit when it is confirmed that the speed of the drive motor approaches zero.
  7. In claim 1, A driving control system for a hybrid vehicle characterized in that the engine clutch is a Normal Close Type engine clutch.
  8. In claim 1, A driving control system for a hybrid vehicle characterized by the hybrid vehicle having a reverse gear removed.
  9. A step for determining whether the vehicle's ignition is off; A step to determine whether the vehicle was driving in reverse; A step of requesting the vehicle's gear to be shifted to neutral; and A step of controlling the speed of the drive motor to become 0; Including, but in the step of controlling the speed of the drive motor to become 0, A driving control method for a hybrid vehicle characterized by making the speed of the drive motor zero through the motor control unit before the relay is turned off.
  10. delete
  11. In claim 9, After the step of controlling the drive motor speed to become 0, A driving control method for a hybrid vehicle characterized by further including a step of turning off a relay.
  12. In claim 9, After the step of controlling the drive motor speed to become 0, A driving control method for a hybrid vehicle, further comprising the step of engaging the engine clutch through an engine clutch control unit.

Description

System and Method for Controlling Driving of Hybrid Vehicle The present invention relates to a driving control system and method for a hybrid vehicle, and more specifically, to a driving control system and method for a hybrid vehicle in which a reverse gear stage is removed, which prevents the engine from burning out by preventing the engine from rotating in reverse when the engine is turned off during the reverse driving process of the vehicle. A hybrid vehicle refers to a vehicle that efficiently combines two or more different power sources to drive it; however, in most cases, it refers to a vehicle driven by an engine that generates rotational force by burning fuel (such as gasoline or fossil fuels) and an electric motor that generates rotational force using battery power. By adopting an electric motor as an auxiliary power source alongside the engine, these hybrid vehicles aim to reduce exhaust emissions and improve fuel efficiency. In response to the demands of the times to improve fuel efficiency and develop eco-friendly products, active research is currently underway in this field. Meanwhile, there has recently been active development of hybrid vehicles with the reverse gear eliminated to reduce costs and improve fuel efficiency. In these hybrid vehicles, reverse movement is enabled by driving the motor in the reverse direction. However, in the case of the aforementioned hybrid vehicle, a Normal Close type engine clutch was applied to improve fuel efficiency. Consequently, if the engine is turned off due to driver error or passenger mishandling while driving in reverse, the engine clutch engages automatically. As a result, problems such as engine damage occur due to the engine rotating in reverse as a result of the motor's reverse rotation. FIG. 1 is a schematic diagram showing the overall configuration of a driving control system of a hybrid vehicle according to an embodiment of the present invention. Figure 2 is a diagram illustrating the control performed when the engine is turned off during reverse driving in a conventional hybrid vehicle. FIG. 3 is a diagram illustrating the control performed when the engine is turned off during reverse driving in a driving control system of a hybrid vehicle according to an embodiment of the present invention. FIG. 4 is a diagram showing the flow of a driving control method for a hybrid vehicle according to an embodiment of the present invention. Hereinafter, a driving control system and method for a hybrid vehicle according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing the overall configuration of a driving control system of a hybrid vehicle according to an embodiment of the present invention, FIG. 2 is a diagram explaining the control performed when the engine is turned off during reverse driving in a conventional hybrid vehicle, and FIG. 3 is a diagram explaining the control performed when the engine is turned off during reverse driving in a driving control system of a hybrid vehicle according to an embodiment of the present invention. Before providing a detailed description of the present invention, the hybrid vehicle to which the present invention is applied is described as a vehicle in which the reverse gear stage is eliminated, and the vehicle performs reverse driving by driving the drive motor in the reverse direction during reverse driving. In addition, the engine clutch included in the hybrid vehicle to which the present invention is applied may be a Normal Close Type engine clutch. Referring to FIG. 1, the driving control system of a hybrid vehicle includes a hybrid control unit (100) and may further include one or more of a transmission control unit (200), a motor control unit (300), a battery control unit (400), and an engine clutch control unit (500). In a driving control system for a hybrid vehicle according to one embodiment of the present invention, the hybrid control unit (100) may be a Hybrid Control Unit (HCU) according to the embodiment. Additionally, the transmission control unit (200) may determine the current gear of the vehicle and shift the gear according to the command of the hybrid control unit (100), the motor control unit (300) may control the speed of the drive motor according to the command of the hybrid control unit (100), and the battery control unit (400) may turn on or off a relay that is positioned between the battery and the drive motor to connect or disconnect the battery and the drive motor. Furthermore, the engine clutch control unit (500) may engage or disengage the engine clutch. Specifically, in a driving control system of a hybrid vehicle according to one embodiment of the present invention, the hybrid control unit (100) can control the vehicle's gear position to shift to a neutral position and the speed of the drive motor to become 0 based on the vehicle's gear position and vehicle driving state information transmitted from