Method for initializing origin of ball-in-ramp applied to vehicle transfer

Abstract

The present invention relates to a method for initializing the origin of a ball-in-ramp applied to a vehicle transfer and, more specifically, to a method for initializing the origin of a ball-in-ramp in a two-speed active transfer case (ATC) that applies one actuator so as to control a clutch, a high-speed mode and a low-speed mode, thereby improving the accuracy of clutch torque control.

Description

Method for initializing the origin of a ball lamp applied to a vehicle transfer

[0001] The present invention relates to a method for initializing the origin of a ball lamp applied to a vehicle transfer, and more specifically, to a method for initializing the origin of a ball lamp in a two-speed ATC (ACTIVE TRANSFER CASE) that controls a clutch, a high-speed mode, and a low-speed mode by applying one actuator, thereby improving the accuracy of clutch torque control.

[0002] A ball in ramp is a structure in which a ball is placed between a pair of ramp plates with grooves formed on two symmetrical and opposite surfaces, and when the pair of ramp plates rotate relative to each other, the ball moves along the grooves, and the two ramp plates move axially apart and then retract together.

[0003] Accordingly, the ball ramp can convert rotational motion into linear motion. Such a ball ramp can be applied to mechanical structures such as clutches in vehicle transmissions.

[0004] Here, the 2-speed ATC (ACTIVE TRANSFER CASE) is a transfer that can perform clutch control, high mode, and low mode.

[0005] A conventional type of transfer is a two-speed ATC model that uses two actuators to control the clutch and high and low speed modes, respectively. This model has a dual structure in which one actuator controls the clutch by applying pressure to it with a ball ramp, and the other actuator controls the high and low speed modes.

[0006] The clutch control of the above model can be achieved by using an electromagnet or by controlling the ball ramp in one direction using a dedicated actuator, thereby enabling the ball origin of the ball ramp to be set.

[0007] Meanwhile, among the other transfer types, there is a two-speed ATC model that uses a single actuator to control the clutch and the rotation cam and shift fork to switch between high and low speed modes. This model is recently preferred because it can reduce manufacturing costs and contribute to the miniaturization of the transfer case. This model performs both the functions of controlling the clutch by pressing the ball ramp using a single actuator and the functions of switching between high and low speed modes by rotating the rotation cam to operate the shift fork.

[0008] However, since the above model uses a single motor to control the ball ramp in both directions, there is no physical restraint device, i.e., a stopper, making it impossible to initialize the ball origin. Consequently, the ball position cannot be initialized when the electronic control unit (ECU) power is turned on or off, making it difficult to compensate for constant torque performance.

[0009] Also, when the vehicle is powered, the 4WD controller can calculate the exact position (rotation angle) of the ball lamp cam based on the MR sensor information of the motor. However, when the vehicle is turned off, the MR sensing information of the motor is lost from the 4WD controller memory, so the exact position of the ball lamp cam cannot be determined. This is because the MR sensor can only count the number of rotations of the motor shaft and cannot determine the absolute position.

[0010] Therefore, the exact position of the ball lamp cannot be known when the vehicle is restarted, making it impossible to accurately control the clutch torque.

[0011] Therefore, in the technical field, there is a need for research that enables simultaneous control of the clutch, high-speed mode, and low-speed mode with one motor, and initializes the origin of the ball lamp when the electronic control unit power or vehicle ignition is turned off / on.

[0012] As a prior art document related to a ball lamp placed in a transfer case, there is Korean Patent Registration No. 10-0484211.

[0013] The present invention has been made to solve the problems in the related technical field as described above, and the purpose of the present invention is to provide a method for initializing the origin of a ball ramp in a two-speed ATC (ACTIVE TRANSFER CASE) that controls a clutch, a high-speed mode, and a low-speed mode by applying one actuator, thereby providing a method for initializing the origin of a ball ramp that improves the accuracy of clutch torque control.

[0014] The present invention for achieving the above objects relates to a method for initializing the origin of a ball ramp applied to a vehicle transfer, which is performed when the vehicle is first started or when a 4L gear is switched, wherein the ball ramp includes a base cam fixed to the inside of a case and having a first groove formed therein; an apply cam arranged adjacent to a clutch and having a second groove formed therein and connected to a motor by a reduction gear; and balls arranged in the first and second grooves; the method comprising: operating an electronic control unit; measuring an initial position of a ball on the first and second grooves of the ball ramp; rotating the apply cam of the ball ramp to move the ball on the first and second grooves to a maximum clutch pressurization position of the 4H gear; rotating the apply cam of the ball ramp to move the ball on the first and second grooves to a maximum clutch pressurization position of the 4L gear; calculating an origin position (L0) of the ball; It may include a step of moving the ball on the first and second grooves by the amount of the ball's origin position at the maximum clutch pressure position of the 4H stage or the maximum clutch pressure position of the 4L stage; and a step of completing the ball's origin initialization.

[0015] In addition, in an embodiment of the present invention, a step of rotating the apply cam of the ball lamp to move the ball to the maximum clutch pressurization position of the 4H stage on the first and second grooves; and a step of measuring the movement distance (L1) of the ball between the initial position of the ball and the position of the ball at the maximum clutch pressurization position of the 4H stage can be performed.

[0016] In addition, in an embodiment of the present invention, a step of rotating the apply cam of the ball lamp to move the ball to the maximum clutch pressurization position of the 4L stage on the first and second grooves; and a step of measuring the movement distance (L2) of the ball between the initial position of the ball and the position of the ball at the maximum clutch pressurization position of the 4L stage can be performed.

[0017] Additionally, in the embodiment of the present invention, in the step of calculating the origin position (L0) of the ball, L0 may be (L1+L2) / 2.

[0018] In addition, in an embodiment of the present invention, the movement position of the ball on the first and second grooves can be measured by detecting the rotational speed of the motor with an MR sensor mounted on the motor that rotates the applicator.

[0019] The present invention relates to a method for initializing the origin of a ball lamp applied to a vehicle transfer, and in the method for initializing the origin of a ball lamp performed when a vehicle is constantly started or when a 4H shift is applied, the ball lamp includes a base cam fixed to the inside of a case and having a first groove formed therein; an apply cam arranged adjacent to a clutch and having a second groove formed therein and connected to a motor by a reduction gear; and balls arranged in the first and second grooves; the method comprising: a step of operating an electronic control unit; a step of measuring an initial position of a ball on the first and second grooves of the ball lamp; a step of rotating the apply cam of the ball lamp to move the ball on the first and second grooves to a maximum clutch press position of a 4H stage; a step of measuring a movement distance (L1) between the initial position of the ball and the position of the ball at the maximum clutch press position of the 4H stage; a step of calculating an origin position (L0) of the ball and moving the ball on the first and second grooves; And a step of completing the initialization of the origin of the ball; and the step of calculating the origin position (L0) of the ball and moving the ball on the first and second grooves can move the ball on the first and second grooves by half of the distance between the maximum clutch pressure position of the 4H stage and the maximum clutch pressure position of the 4L stage measured at the time of the first start of the vehicle of the first clause.

[0020] In addition, in an embodiment of the present invention, the movement position of the ball on the first and second grooves can be measured by detecting the rotational speed of the motor with an MR sensor mounted on the motor that rotates the applicator.

[0021] The technical solutions obtainable in the present invention are not limited to the solutions mentioned above, and other solutions not mentioned will be clearly understood by a person having ordinary skill in the art to which the present invention pertains from the description below.

[0022] According to the present invention, the origin of the ball ramp can be precisely initialized in a two-speed ATC (ACTIVE TRANSFER CASE) that controls the clutch, high-speed mode, and low-speed mode by applying one actuator.

[0023] This can improve driving performance by enhancing the accuracy of clutch torque control.

[0024] The effects that can be obtained through the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention pertains from the description below.

[0025] Various embodiments of the present invention are described with reference to the drawings, wherein like reference numerals are used to refer to similar elements generally. In the following description, for purposes of explanation, numerous specific details are set forth to provide a comprehensive understanding of one or more embodiments. However, it will be apparent that such embodiments may be practiced without these specific details.

[0026] Figure 1 is a block cross-sectional view showing the structure of a transfer to which an embodiment of the present invention is applied.

[0027] Figure 2 is a drawing showing a connection structure between a base cam, an apply cam, and a clutch unit to which an embodiment of the present invention is applied.

[0028] FIG. 3 is a drawing showing a connection structure between an application cam, a reduction gear, and an actuator to which an embodiment of the present invention is applied.

[0029] FIG. 4a is a drawing showing a ball positioned at the origin in a ball lamp to which an embodiment of the present invention is applied.

[0030] FIG. 4b is a drawing showing the position of the ball in a ball lamp to which an embodiment of the present invention is applied when the ball is in high-speed mode or low-speed mode.

[0031] Figure 4c is a drawing showing the axial (X) movement distance (D) of the apply cam that pressurizes the clutch pack.

[0032] Fig. 5 is a drawing showing a state in which a ball is located at the origin in a ball lamp to which an embodiment of the present invention is applied.

[0033] FIG. 6 is a flowchart showing a method for initializing the ball origin at the time of initial startup or when switching to 4L (Low: low-speed mode) in a method for initializing the ball origin of a ball lamp according to an embodiment of the present invention.

[0034] FIG. 7 is a flowchart showing a method for initializing the ball origin when the ball lamp is started at all times or when switching to 4H (High: high-speed mode) according to an embodiment of the present invention.

[0035] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below 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 solely 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 solely by the scope of the claims.

[0036] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are illustrative and are not limited to the matters illustrated in the drawings. Like reference numerals refer to like components throughout the specification. In addition, in describing the present invention, if a detailed description of a related known technology is judged to unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. When the terms “includes,” “has,” and “consists of” are used in this specification, other parts may be added unless “only” is used. When a component is expressed in the singular, it includes a case where the plural is included unless there is a specifically explicit description.

[0037] When interpreting a component, it is interpreted as including the error range even if there is no separate explicit description.

[0038] When describing a positional relationship, for example, when the positional relationship between two parts is described as 'on top of', 'upper part of', 'lower part of', 'next to', etc., one or more other parts may be located between the two parts, unless 'right away' or 'directly' is used.

[0039] Although terms like "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another. Therefore, a "first" component referred to below may also be a "second" component within the technical scope of the present invention.

[0040] Identical reference numerals throughout the specification refer to identical components.

[0041] The size and thickness of each component shown in the drawing are shown for convenience of explanation, and the present invention is not necessarily limited to the size and thickness of the component shown.

[0042] The individual features of the various embodiments of the present invention can be partially or wholly combined or combined with each other, and as can be fully understood by those skilled in the art, various technical connections and operations are possible, and each embodiment can be implemented independently of each other or can be implemented together in a related relationship.

[0043] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. The multiple embodiments described below may be applied in duplicate as long as they do not conflict with each other.

[0044]

[0045] First, referring to FIGS. 1 to 3, a vehicle transfer (100) to which the present invention is applied is disclosed. This may be a transfer (100) that switches between high-speed and low-speed modes of clutch control and four-wheel drive using a single actuator (170).

[0046] The above transfer (100) may include a case (110), an input shaft (120), a clutch (130), a chain (140), a ball ramp (150), a reduction gear (160), an actuator (170), a rotation cam (181), a shift fork (183), a planetary gear (185), and a drive shaft (190).

[0047] Although not shown in the drawing, a plurality of bearings may be arranged inside the case (110) to support the input shaft (120), drive shaft (190), etc. and to allow them to rotate smoothly. In addition, a shape may be formed to support the above-described components arranged inside the transfer (100), or support components may be arranged.

[0048] The case (110) may have a certain space defined inside, and components constituting the transfer (100) may be arranged. One side of the case (110) may be coupled to a transmission (not shown).

[0049] The input shaft (120) can be placed inside the case (110), one end (121) of the input shaft (120) can be connected to a transmission, and the other end (123) can be connected to a rear wheel propeller shaft (not shown) to transmit power to the rear wheel.

[0050] The clutch (130) may be arranged on the outer periphery of the input shaft (120) inside the case (110), and the clutch (130) may include a cylindrical clutch drum (131) and a clutch pack (133) arranged on the inside of the clutch drum (131).

[0051] The chain (140) can transmit power by connecting the input shaft (120) and the drive shaft (190).

[0052] The drive shaft (190) is connected to the front wheel propeller shaft and can transmit power to the front wheel.

[0053] The actuator (170) may be a motor, and the motor (170) may be equipped with an MR sensor (magnetoresistive sensor), and the actuator (170) may be connected to the ball lamp (150) and the rotary cam (181) via a reduction gear (160). Specifically, a gear shaft (163) may be connected to the operating gear (161) of the reduction gear (160), and a rotary cam (181) may be arranged on the gear shaft (163).

[0054] The shift fork (183) is connected to the rotation cam (181), and moves along the rotation cam (181) according to the operation of the actuator (170), and can switch the planetary gear (185) to a high-speed mode or a low-speed mode in the four-wheel drive.

[0055] The ball ramp (150) may include an apply cam (153) arranged adjacent to the clutch pack (133), a base cam (151) fixed to the inside of the case (110), and a ball (155) arranged in a first groove (151c) of the base cam (151) and a second groove (153b) of the apply cam (153). Depending on the design specifications, a first stopper (151a) for limiting the maximum rotation position in a four-wheel drive high-speed mode and a second stopper (151b) for limiting the maximum rotation position in a four-wheel drive low-speed mode may be arranged on the base cam (151). This may physically limit the rotation range of the apply cam (153).

[0056] The ball ramp (150) has a gear portion (153a) of the apply cam (153) meshed with the operating gear (161), and the ball (155) moves along the first and second grooves (151c, 153b) according to the rotational direction of the actuating gear (161), and moves the apply cam (153) toward the clutch pack (133) to pressurize the clutch pack (133). The operation of the clutch (130) changes depending on the degree of rotation of the ball ramp (150), and two-wheel drive or four-wheel drive can be switched. In addition, the four-wheel drive mode can be changed depending on the rotational direction. For example, when the apply cam (153) rotates clockwise, it can be in a four-wheel drive low-speed mode, and when it rotates counterclockwise, it can be in a four-wheel drive high-speed mode.

[0057] Referring to FIGS. 4a and 4b, when the base cam (151) is fixed inside the case (110), the ball ramp (150) rotates by the reduction gear (160), and the ball (155) moves along the first and second grooves (151c, 153b) to move the apply cam (153) toward the clutch pack (133) and pressurize the clutch pack (133).

[0058] Referring to FIG. 4c, the distance (D) between the apply cam (153) and the clutch pack (133) is shown, and as the ball (155) moves through the first and second grooves (151c, 153b), the distance (D) between the apply cam (153) and the clutch pack (133) narrows, pressurizing the clutch pack (133) to switch between two-wheel drive and four-wheel drive.

[0059] Referring to Fig. 5, a structure in which a ball of a ball lamp (150) moves along a second groove (153b) is disclosed. The drawing symbols disclosed in Fig. 5 are as follows.

[0060] Z: Origin of the ball (155)

[0061] D0: The range of the ball (155) that performs two-wheel drive (2WD)

[0062] D1: The range of the ball (155) that performs the 4WD low-speed mode

[0063] D2: The range of the ball (155) that performs 4WD high-speed mode

[0064] P1: Maximum torque point in low-speed mode, maximum angle point in low-speed mode

[0065] P2: Maximum torque point in high-speed mode, maximum angle point in high-speed mode

[0066] B0: Angle from the origin of the ball (155) and the clutch direction movement distance of the apply cam (153)

[0067] B1: Angle of ball (155) and clutch direction movement distance of apply cam (153) at the time of switching from 2WD to 4WD low-speed mode

[0068] B2: Angle of ball (155) and clutch direction movement distance of apply cam (153) at maximum torque point in 4WD low-speed mode

[0069] B3: Angle of ball (155) and clutch direction movement distance of apply cam (153) at the time of switching from 2WD to 4WD high-speed mode

[0070] B4: Angle of ball (155) and clutch direction movement distance of apply cam (153) at maximum torque point in 4WD high-speed mode

[0071] The angle of the ball (155) at each point described above and the clutch direction movement distance of the apply cam (153) may vary depending on the design specifications.

[0072]

[0073] FIGS. 6 and 7 disclose a method for initializing the origin of a ball lamp (150) applied to a vehicle transfer (100) according to the embodiment of the present invention described above.

[0074] First, referring to FIG. 6, a method for initializing the origin of the ball (155) at the time of initial startup or when switching to 4L (Low: low-speed mode) is disclosed in the origin initialization method of the ball lamp (150). And referring to FIG. 7, a method for initializing the origin of the ball (155) at the time of constant startup or when switching to 4H (High: high-speed mode) is disclosed in the origin initialization method of the ball lamp (150).

[0075] The 4L stage below represents a 4-wheel drive low-speed mode, and the 4H stage represents a 4-wheel drive high-speed mode. In addition, the positions of the balls (155) on the first and second grooves (151c, 153b) corresponding to the maximum clutch pressure positions of the 4L and 4H stages below (rotation angle of the apply cam (153)) can be preset by initially setting the rotation value of the motor.

[0076] First, referring to FIG. 6, in the origin initialization method of the ball lamp (150) according to the embodiment of the present invention, when the vehicle is first started or the 4L gear is switched, the step of operating the electronic control unit, the step of measuring the initial position of the ball (155) on the first and second grooves (151c, 153b) of the ball lamp (150), the step of rotating the apply cam (153) of the ball lamp (150) to move the ball (155) on the first and second grooves (151c, 153b) to the maximum clutch pressing position of the 4H gear, the step of measuring the movement distance (L1) of the ball (155) between the initial position of the ball (155) and the position of the ball (155) at the maximum clutch pressing position of the 4H gear, the step of rotating the apply cam (153) of the ball lamp (150) to move the ball (155) on the first and second grooves (151c, 153b) to the maximum clutch pressing position of the 4H gear It may include a step of moving the ball (155) to the maximum clutch pressing position of the 4L stage, a step of measuring the movement distance (L2) of the ball (155) between the initial position of the ball (155) and the position of the ball (155) at the maximum clutch pressing position of the 4L stage, a step of calculating the origin position (L0) of the ball (155), a step of moving the ball (155) on the first and second grooves (151c, 153b) by the origin position of the ball (155) at the maximum clutch pressing position of the 4H stage or the maximum clutch pressing position of the 4L stage, and a step of completing the origin initialization of the ball (155).

[0077] The step of operating the above electronic control unit may be an ECU (electronic control unit) that controls electronic components of the vehicle, and may be operated continuously when the vehicle is first started, or may be operated periodically when switching between four-wheel drive high-speed mode and low-speed mode.

[0078] The step of measuring the initial position of the ball (155) on the first and second grooves (151c, 153b) of the above ball lamp (150) may be a step in which the electronic control unit detects the rotational speed of the motor (170) through the MR sensor mounted on the motor (170) and measures the current position of the ball (155) on the first and second grooves (151c, 153b).

[0079]

[0080] The step of rotating the apply cam (153) of the above ball lamp (150) to move the ball (155) to the maximum clutch pressurization position of the 4H stage on the first and second grooves (151c, 153b) may be a step in which the electronic control unit drives the motor (170) to rotate the apply cam (153) to move the ball (155) to the maximum clutch pressurization position of the 4H stage. In Fig. 5, the ball (155) is in a state of moving to the P2 position.

[0081] The step of measuring the movement distance (L1) of the ball (155) between the initial position of the ball (155) and the position of the ball (155) at the maximum clutch pressurization position of the 4H stage may be a step in which the electronic control unit detects the rotation speed of the motor (170) through the MR sensor mounted on the motor (170) to measure the position of the ball (155) on the first and second grooves (151c, 153b) at the current maximum clutch pressurization position of the 4H stage, thereby determining the distance the ball (155) has moved on the first and second grooves (151c, 153b).

[0082] The step of rotating the apply cam (153) of the ball ramp (150) to move the ball (155) to the maximum clutch pressurization position of the 4L stage on the first and second grooves (151c, 153b) may be a step in which the electronic control unit drives the motor (170) to rotate the apply cam (153) to move the ball (155) to the maximum clutch pressurization position of the 4L stage. In Fig. 5, the ball (155) is in a state of moving to the P1 position.

[0083] The step of measuring the movement distance (L2) of the ball (155) between the initial position of the ball (155) and the position of the ball (155) at the maximum clutch pressurization position of the 4L stage may be a step in which the electronic control unit detects the rotation speed of the motor (170) through the MR sensor mounted on the motor (170) and measures the position of the ball (155) on the first and second grooves (151c, 153b) at the current maximum clutch pressurization position of the 4L stage, thereby determining the distance the ball (155) has moved on the first and second grooves (151c, 153b).

[0084] The step of calculating the origin position (L0) of the above ball (155) calculates the origin of the ball (155) through L0 = (L1 + L2) / 2. That is, the origin of the ball (155) on the first and second grooves (151c, 153b) is calculated by moving the ball (155) by half of the distance between the initial position of the ball (155) and the position of the ball (155) at the maximum clutch press position of the 4H stage and the distance between the initial position of the ball (155) and the position of the ball (155) at the maximum clutch press position of the 4L stage.

[0085] The step of moving the ball (155) on the first and second grooves (151c, 153b) by the amount of the origin position of the ball (155) at the maximum clutch pressure position of the 4H stage or the maximum clutch pressure position of the 4L stage may be a step of moving the ball (155) to the Z point in FIG. 5. According to the above calculation formula, the ball (155) is positioned at the Z point on the first and second grooves (151c, 153b). This can be achieved by operating the motor (170) of the electronic control unit to rotate the apply cam (153).

[0086] The step of completing the origin initialization of the ball (155) above is to position the ball (155) at point Z, which is the origin position of the ball (155), at the time of initial start-up or when the 4L stage is switched, and then complete the origin initialization of the ball (155). Accordingly, since the ball (155) is at the origin, torque control for the clutch can be accurately performed when rotating the apply cam (153).

[0087]

[0088] Next, referring to FIG. 7, in the origin initialization method of the ball lamp (150) according to the embodiment of the present invention, when the vehicle is constantly started or 4H switching is authorized, the steps of operating the electronic control unit, measuring the initial position of the ball (155) on the first and second grooves (151c, 153b) of the ball lamp (150), rotating the apply cam (153) of the ball lamp (150) to move the ball (155) on the first and second grooves (151c, 153b) to the maximum clutch pressing position of the 4H stage, measuring the movement distance (L1) between the initial position of the ball (155) and the position of the ball (155) at the maximum clutch pressing position of the 4H stage, calculating the origin position (L0) of the ball (155) and moving the ball (155) on the first and second grooves (151c, 153b). And, it may include a step of completing the initialization of the origin of the ball (155).

[0089] The step of operating the above electronic control unit may be an ECU (electronic control unit) that controls electronic components of the vehicle, and may be operated continuously after the vehicle is started, or may be operated periodically when switching between the four-wheel drive high-speed mode and low-speed mode.

[0090] The step of measuring the initial position of the ball (155) on the first and second grooves (151c, 153b) of the above ball lamp (150) may be a step in which the electronic control unit detects the rotational speed of the motor (170) through the MR sensor mounted on the motor (170) and measures the current position of the ball (155) on the first and second grooves (151c, 153b).

[0091] The step of rotating the apply cam (153) of the above ball lamp (150) to move the ball (155) to the maximum clutch pressurization position of the 4H stage on the first and second grooves (151c, 153b) may be a step in which the electronic control unit drives the motor (170) to rotate the apply cam (153) to move the ball (155) to the maximum clutch pressurization position of the 4H stage. In Fig. 5, the ball (155) is in a state of moving to the P2 position.

[0092] The step of measuring the movement distance (L1) of the ball (155) between the initial position of the ball (155) and the position of the ball (155) at the maximum clutch pressurization position of the 4H stage may be a step in which the electronic control unit detects the rotation speed of the motor (170) through the MR sensor mounted on the motor (170) to measure the position of the ball (155) on the first and second grooves (151c, 153b) at the current maximum clutch pressurization position of the 4H stage, thereby determining the distance the ball (155) has moved on the first and second grooves (151c, 153b).

[0093] The step of calculating the origin position (L0) of the ball (155) and moving the ball (155) on the first and second grooves (151c, 153b) may be a step of moving the ball (155) on the first and second grooves (151c, 153b) by half the distance between the maximum clutch pressure position of the 4H stage and the maximum clutch pressure position of the 4L stage measured at the time of the initial start of the vehicle according to the operating method disclosed in FIG. 6.

[0094] That is, the ball (155) is moved from P2, which is half the distance between P2 and P1, to Z on the first and second grooves (151c, 153b).

[0095] The step of completing the origin initialization of the ball (155) above is to position the ball (155) at point Z, which is the origin position of the ball (155) at the time of normal start-up or 4H stage switching, and then complete the origin initialization of the ball (155). Accordingly, since the ball (155) is at the origin, torque control for the clutch can be accurately performed when rotating the apply cam (153).

[0096] The above merely illustrates a specific embodiment of a method for initializing the origin of a ball lamp applied to a vehicle transfer.

[0097] Accordingly, it is to be made clear that a person having ordinary skill in the art can easily understand that the present invention can be substituted and modified in various forms without departing from the spirit of the present invention described in the claims below.

[0098]

[0099] [Explanation of symbols]

[0100] 100:Transfer 110:Case

[0101] 120: Input shaft 130: Clutch

[0102] 140: Chain 150: Ball Ramp

[0103] 151: Base cam 151c: First groove

[0104] 153: Apply Cam 153b: Second Groove

[0105] 155: Ball 160: Reduction gear

[0106] 170: Motor (actuator) 181: Yuntong cam

[0107] 183; Shift fork 185: Planetary gear

[0108] 190: Drive shaft

Claims

1. In the method of initializing the origin of the ball lamp when the vehicle is first started or when the 4L gear is switched, The ball lamp includes a base cam fixed to the inside of the case and having a first groove formed therein; an apply cam arranged adjacent to the clutch and having a second groove formed therein and connected to the motor by a reduction gear; and a ball arranged in the first and second grooves. Steps for operating the electronic control unit; A step of measuring the initial position of the ball on the first and second grooves of the above ball lamp; A step of rotating the apply cam of the above ball lamp to move the ball to the maximum clutch pressurization position of the 4H stage on the first and second grooves; A step of rotating the apply cam of the above ball lamp to move the ball to the maximum clutch pressurization position of the 4L stage on the first and second grooves; Step of calculating the origin position (L0) of the ball; A step of moving the ball on the first and second grooves by the amount of the ball's origin position at the maximum clutch pressure position of the 4H stage or the maximum clutch pressure position of the 4L stage; and Step to complete initialization of the ball's origin; Method for initializing the origin of a ball lamp applied to a vehicle transfer, including 2. In paragraph 1, A step of rotating the applicator of the above ball lamp to move the ball to the maximum clutch pressure position of the 4H stage on the first and second grooves; thereafter A step of measuring the ball movement distance (L1) between the ball's initial position and the ball's position at the maximum clutch pressure position of the 4H stage; Method for initializing the origin of a ball lamp applied to a vehicle transfer, which performs 3. In paragraph 1, A step of rotating the application cam of the above ball lamp to move the ball to the maximum clutch pressure position of the 4L stage on the first and second grooves; thereafter A step of measuring the distance traveled by the ball (L2) between the ball's initial position and the ball's position at the maximum clutch pressure position of the 4L stage; Method for initializing the origin of a ball lamp applied to a vehicle transfer, which performs 4. In paragraph 1, In the step of calculating the origin position (L0) of the above ball, L0=(L1+L2) / 2, the origin initialization method of the ball lamp applied to the vehicle transfer 5. In paragraph 1, A method for initializing the origin of a ball lamp applied to a vehicle transfer, in which the movement position of the ball on the first and second grooves is measured by detecting the rotational speed of the motor with an MR sensor mounted on the motor that rotates the applicam.

6. In the method of initializing the origin of the ball lamp when the vehicle is constantly started or when 4H switching is authorized, The ball lamp includes a base cam fixed to the inside of the case and having a first groove formed therein; an apply cam arranged adjacent to the clutch and having a second groove formed therein and connected to the motor by a reduction gear; and a ball arranged in the first and second grooves. Steps for operating the electronic control unit; A step of measuring the initial position of the ball on the first and second grooves of the above ball lamp; A step of rotating the apply cam of the above ball lamp to move the ball to the maximum clutch pressurization position of the 4H stage on the first and second grooves; A step of measuring the movement distance (L1) between the ball's initial position and the ball's position at the maximum clutch pressurization position of the 4H stage; A step of calculating the origin position (L0) of the ball and moving the ball on the first and second grooves; and comprising a step of completing the initialization of the origin of the ball; The step of calculating the origin position (L0) of the ball and moving the ball on the first and second grooves is characterized in that the ball is moved on the first and second grooves by half the distance between the maximum clutch pressure position of the 4H stage and the maximum clutch pressure position of the 4L stage measured at the first start of the vehicle of the first clause, and the origin initialization method of a ball ramp applied to a vehicle transfer.

7. In paragraph 6, A method for initializing the origin of a ball lamp applied to a vehicle transfer, in which the movement position of the ball on the first and second grooves is measured by detecting the rotational speed of the motor with an MR sensor mounted on the motor that rotates the applicam.

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