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KR-102965068-B1 - LAUNCH CONTROL METHOD FOR VEHICLE

KR102965068B1KR 102965068 B1KR102965068 B1KR 102965068B1KR-102965068-B1

Abstract

The present invention comprises the steps of: increasing the clutch torque as the braking pressure decreases; maintaining the clutch torque constant for a predetermined first reference time; gradually reducing the clutch torque within a range greater than or equal to a predetermined second reference torque which is smaller than the first reference torque; gradually increasing the clutch torque until the clutch torque becomes a predetermined third reference torque which is larger than the first reference torque; and terminating the control when the state in which the clutch slip is less than a predetermined critical synchronization slip is greater than or equal to a predetermined critical synchronization time.

Inventors

  • 조성현

Assignees

  • 현대자동차주식회사
  • 기아 주식회사

Dates

Publication Date
20260513
Application Date
20210223

Claims (11)

  1. [A]: When launch control is initiated, a step of increasing clutch torque as braking pressure decreases; [B]: A step of maintaining the clutch torque constant for a predetermined first reference time when the clutch torque becomes greater than or equal to a predetermined first reference torque; [C]: After the first reference time has elapsed, if the wheel slip ratio exceeds a predetermined first reference slip ratio, a step of gradually reducing the clutch torque within a range greater than or equal to a predetermined second reference torque which is smaller than the first reference torque; [D]: A step of gradually increasing the clutch torque until the clutch torque becomes a predetermined third reference torque greater than the first reference torque, when the wheel slip ratio is less than or equal to a predetermined second reference slip ratio that is smaller than the first reference slip ratio, or when a predetermined second reference time has elapsed from the point in time when the clutch torque becomes greater than or equal to the first reference torque; [E]: A step of terminating control when the state in which the clutch slip is less than a predetermined critical synchronization slip is greater than or equal to a predetermined critical synchronization time; A launch control method for a vehicle characterized by being composed including
  2. In claim 1, The initiation of the above launch control is achieved when the engine speed reaches a predetermined reference speed while the driver selects launch control and both the accelerator pedal and the brake pedal are pressed. A launch control method for a vehicle characterized by
  3. In claim 2, The clutch torque maintains a predetermined ready torque until the engine speed reaches the reference speed. A launch control method for a vehicle characterized by
  4. In claim 1, In the above [A] step, If the above braking pressure is greater than or equal to a predetermined second reference braking pressure, the clutch torque is gradually reduced, and If the above braking pressure is less than the above second reference braking pressure, the clutch torque is increased at a predetermined first slope. A launch control method for a vehicle characterized by
  5. In claim 4, While the accelerator pedal is maintained in a state where it is pressed above a predetermined second APS reference value, if the braking pressure becomes lower than a predetermined third reference braking pressure which is smaller than the second reference braking pressure, the clutch torque is increased at a predetermined second slope until it reaches the first reference torque. A launch control method for a vehicle characterized by
  6. In claim 1, In the above [C] step, the clutch torque is reduced while simultaneously performing feedback control to reduce the wheel slip ratio. A launch control method for a vehicle characterized by
  7. In claim 1, In the above [C] step, if the wheel slip ratio is less than or equal to the first reference slip ratio, the clutch torque is maintained without being reduced. A launch control method for a vehicle characterized by
  8. In claim 1, In the above [D] step, the clutch torque is increased while simultaneously performing feedback control to reduce the wheel slip ratio. A launch control method for a vehicle characterized by
  9. [A]: When launch control is initiated, a step of increasing clutch torque as braking pressure decreases; [B]: A step of maintaining the clutch torque constant for a predetermined first reference time when the clutch torque becomes greater than or equal to a predetermined first reference torque; [C]: After the first reference time has elapsed, if the wheel slip ratio exceeds a predetermined first reference slip ratio, a step of gradually reducing the clutch torque within a range greater than or equal to a predetermined second reference torque which is smaller than the first reference torque; [D]: A step of gradually increasing the clutch torque until the clutch torque becomes a predetermined third reference torque greater than the first reference torque, when the wheel slip ratio is less than or equal to a predetermined second reference slip ratio that is smaller than the first reference slip ratio, or when a predetermined second reference time has elapsed from the point in time when the clutch torque becomes greater than or equal to the first reference torque; [E]: A step of terminating control when the state in which the clutch slip is less than a predetermined critical synchronization slip is greater than or equal to a predetermined critical synchronization time; Composed of including, After the start of the [D] step above, if the clutch slip is less than or equal to a predetermined first reference clutch slip, the average vehicle speed of the non-driven wheels is greater than or equal to a predetermined first reference vehicle speed, and the wheel slip ratio is less than or equal to a predetermined third reference slip ratio, Further performing the step of increasing the above clutch torque toward a predetermined fourth reference torque. A launch control method for a vehicle characterized by
  10. In claim 9, If the above non-driven wheel average speed is greater than or equal to a predetermined second reference speed, or if the state in which the above clutch slip is less than the above critical synchronization slip is greater than or equal to the above critical synchronization time, the control is terminated. A launch control method for a vehicle characterized by
  11. In claim 1, Prohibiting the control of the vehicle's drive wheel spin prevention function while performing the steps [A] through [E] above. A launch control method for a vehicle characterized by

Description

Launch Control Method for Vehicle The present invention relates to a technology for launch control of a vehicle capable of precisely controlling the torque transmitted from the engine to the drive wheels, such as in a DCT (Dual Clutch Transmission) or AMT (Automated Manual Transmission), through the control of clutch torque. Vehicle launch control is a control system designed to accelerate a stationary vehicle as quickly as possible, and is primarily used in racing vehicles or luxury passenger cars. In the case of vehicles equipped with an AT (Automatic Transmission) featuring a torque converter, launch control through precise torque adjustment is difficult because the torque transmitted to the drive wheels is structurally determined primarily by the torque converter. However, in vehicles equipped with transmissions such as DCT or AMT that can precisely control the torque transmitted from the engine to the drive wheels by controlling the clutch torque, launch control can be implemented through the appropriate control of the clutch torque. The matters described as the background technology of the above invention are intended only to enhance understanding of the background of the invention and should not be construed as an acknowledgment that they constitute prior art already known to those skilled in the art. FIG. 1 is a configuration diagram of a DCT-equipped vehicle to which the present invention can be applied. FIGS. 2 and FIGS. 3 are flowcharts illustrating an embodiment of a launch control method for a vehicle according to the present invention. Figure 4 is a graph illustrating a launch control method for a vehicle according to the present invention. Specific structural or functional descriptions of embodiments of the present invention disclosed in this specification or application are merely illustrative for the purpose of explaining embodiments according to the present invention, and embodiments according to the present invention may be implemented in various forms and should not be interpreted as being limited to the embodiments described in this specification or application. Since embodiments according to the present invention may be subject to various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in this specification or application. However, this is not intended to limit embodiments according to the concept of the present invention to specific disclosed forms, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. Terms such as "first" and/or "second" may be used to describe various components, but said components shall not be limited by said terms. For the sole purpose of distinguishing one component from another, for example, without departing from the scope of rights according to the concept of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. Conversely, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between. Other expressions describing the relationship between components, such as "between" and "exactly between," or "adjacent to" and "directly adjacent to," should be interpreted in the same way. The terms used herein are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “comprising” or “having” are intended to specify the existence of the described features, numbers, steps, actions, components, parts, or combinations thereof, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this specification. The present invention will be described in detail below by explaining preferred embodiments of the invention with reference to the attached drawings. Identical reference numerals in each drawing indicate identical components. FIG.