SHIFT-BY-WIRE DEVICE AND TRANSLATION METHOD THAT USES THE SAME

Abstract

A shift-by-wire (SBW) device comprising: a housing (150); a motor (300) configured to generate torque using an applied current; a hollow rotor shaft (180); a reduction gear (400) configured to receive the generated torque from the motor (300), convert the generated torque, and transmit the converted torque to an output shaft (80); an output shaft (80) having one end fitted with an encoder magnet (240) and the other end directly connected to a manual shaft passing through an interior of the rotor shaft (180) and transmitting the torque increased by the reduction gear (400) to a detent plate; and a controller (250) arranged in the housing (150) and detecting a position of the output shaft (80) from the encoder magnet (240).

Description

Technical area

[0001] The present invention relates to a shift-by-wire (SBW) device and a shifting system using the same, and more particularly to structures of an actuator and a reduction gear of an SBW device. Background technology

[0002] Recently, there has been a technological development in automotive technology where various mechanical devices are being replaced by electrical systems, reflecting consumer demand for comfort options.

[0003] In the conventional shift-by-cable (SBC) method, when a shift lever of a vehicle is moved, a detent lever is rotated by a cable, and a manual valve is moved by the rotation of the detent lever, and flow paths of P, R, N, and D stages on a valve body are opened.

[0004] In the Shift-by-Wire (SBW) method, in which the shifting operation unit of a transmission device is electronically controlled, all mechanisms that were previously mechanically operated are modified to be controlled electrically. Since the SBW method does not have a mechanical operating unit (cable or mechanical manual valve) compared to the conventional SBC method, one advantage of the SBW method is that the weight of the transmission device is reduced and the layout configuration is simple.

[0005] However, since the mechanical components are eliminated, a problem with the SBW method is that an emergency situation may occur, such as being unable to control an actuator due to an electrical and / or electronic signal failure.

[0006] In conventional SBW technology, a driver's intention to shift is transmitted to an actuator through a controller, and a final operating force is transmitted to a reduction gear directly connected to the actuator and to a manual shaft of a shift output stage.

[0007] A problem with such conventional technology is that mechanical and / or electrical errors may occur when detecting both a position of an actuator, a position of a sensor magnet, and a position of a lock switch sensor. RevelationTechnical Problem

[0008] The present invention relates to the provision of a shift-by-wire (SBW) device in which an SBW actuator and a reduction gear are integrated with a controller, and a structure for detecting a position of a manual shaft is improved, and a shifting system using the same. Technical solution

[0009] One aspect of the present invention provides a shift-by-wire (SBW) device comprising a housing, a motor configured to generate torque using an applied current, a rotor shaft in a hollow design, a reduction gear configured to receive the torque of the motor, convert the generated torque, and transmit the converted torque to an output shaft, an output shaft having one end provided with an encoder magnet and the other end directly connected to a manual shaft passing through an interior of the rotor shaft and transmitting the torque increased by the reduction gear to a detent plate, and a controller disposed in the housing and detecting a position of the output shaft from the encoder magnet.

[0010] One aspect of the present invention provides a shifting method using an SBW device, comprising the steps of receiving an operation request from a gear controller in response to a selection among the P, R, N, and D stages by a driver, applying current to a motor to generate power, rotating an output shaft by a position of the selected shift stage and transmitting the power to a manual shaft, and detecting a rotational position of the motor and a position of an output shaft in real time, stopping driving of the motor, and then transmitting information about the shift stage to the gear controller. Beneficial effects

[0011] In the conventional shift-by-cable (SBC) method and the conventional shift-by-wire (SBW) method, in which a controller is provided separately from an SBW, a position of a gear stage is detected by an interlock switch positioned between a motor and a manual shaft and is transmitted to a transmission control unit (TCU), so that shift control is performed. Conversely, according to embodiments of the present invention, in an SBW method in which a controller is provided integrally with an SBW, a magnet is provided at one end of an SBW output shaft, and this magnet is detected by a position sensor of the integrated controller, thus eliminating the need for an interlock switch.Therefore, the number of components can be reduced, thereby reducing costs.

[0012] According to the present invention, a rotary shaft of a motor is formed to be hollow, and an output shaft extends through an inside of the hollow rotary shaft and extends to a controller, and thus it is possible to directly detect a position of the manual shaft, and it is possible to minimize a position error caused by a backlash of a reduction gear.

[0013] Effects of the present invention are not limited to the effects described above, and other unmentioned effects will be apparent to those skilled in the art from the following description. List of characters Fig. 1 is a cross-sectional view illustrating a shift-by-wire (SBW) device according to the related art from which a controller is separated. Fig. 2 is a view illustrating a configuration of components of an SBW device according to an embodiment of the present invention. Fig. 3 is a cross-sectional view of the SBW device according to the embodiment of the present invention. Fig. 4 is a side sectional view of the SBW device according to the embodiment of the present invention. Fig. 5 is a view illustrating a structure for preventing detachment of a detection plate of the SBW device according to the embodiment of the present invention. Fig. 6 is a flowchart illustrating a switching method using the SBW device according to the embodiment of the present invention. Modes of invention

[0014] The above-described objects of the present invention, other objects, advantages, features and methods for achieving the same will become apparent with reference to the accompanying drawings and the following detailed embodiments.

[0015] However, the present invention is not limited to the disclosed embodiments, but may be implemented in various different forms. The embodiments are provided to fully explain the present invention and to fully explain the scope of the present invention to those skilled in the art. The scope of the present invention is defined by the appended claims.

[0016] The terms used herein are provided only to describe embodiments of the present invention and not for purposes of limitation. Unless the context clearly indicates otherwise, the singular forms include the plural forms. It is to be understood that the terms "comprise" and / or "comprising," when used herein, define some listed components, steps, acts, and / or elements, but do not preclude the presence or addition of one or more other components, steps, acts, and / or elements.

[0017] In order to facilitate understanding by those skilled in the art, problems of the related art to be solved by the present invention will first be described, and then exemplary embodiments of the present invention will be described.

[0018] Fig. 1 is a cross-sectional view illustrating a shift-by-wire (SBW) device according to the related art from which a controller is separated.

[0019] The SBW device according to the related art from which a controller is separated comprises a motor 1 , a rotor shaft 2 , a rotor magnet 3 , a reduction gear 4 and a manual shaft 5 As described above, the SBW device includes a lock switch 6 to check the position of a switching step.

[0020] According to the related art, an end position of an output stage is detected by detecting a position of a rotor.

[0021] According to the related art, there is a problem that the inclusion of a lock switch causes an increase in cost and a position error caused by a backlash of the reduction gear occurs.

[0022] In addition, according to the related art, a position of the manual shaft of the final output stage is not directly detected, and the position of the rotor is detected and estimated, and thus there is a problem that the accuracy of position detection is reduced.

[0023] The present invention is proposed to address the problems described above. According to the present invention, by detecting a position of a shift stage using a magnet attached to one end of an output shaft and using a magnetoresistive (MR) sensor of a controller, the controller can accurately check a current position of the shift stage.

[0024] An SBW device according to an embodiment of the present invention includes a motor that generates torque, a reduction gear that increases the torque to a level sufficient to drive a system (shifting) and converts the torque, and a controller that controls the driving of the motor, detects a position of the motor and a position of an output shaft, and transmits the positions to a transmission control unit (TCU). Hereinafter, the SBW device according to the embodiment of the present invention will be described with reference to Fig. 2 to Fig. 4 described.

[0025] Fig. 2 illustrates a configuration of components of the SBW device according to the embodiment of the present invention. The SBW device includes a vent cover 20 , a gearbox cover 30 , a wave washer 40 , an O-ring 50, an external gear 60 , a bearing, an output shaft 80 , an internal gear 90 , an engine cover, an insulator 110 , a stator core, a busbar form, a busbar 140 , a housing 150 , a seal, a housing cover 170 , a rotor shaft 180 , a rotor sleeve 190 , a rotor core 200 , a motor magnet 210 , a rotor magnet yoke 220 , an engine sensor magnet 230 and an encoder magnet 240 .

[0026] The SBW device according to the present invention comprises the housing 150 , an engine 300 which generates a torque using a current applied to it, a hollow rotor shaft 180 , a reduction gear 400 , which is the torque generated by the engine 300receives, converts the torque and transmits the converted torque to an output shaft, the output shaft 80 which has one end connected to the encoder magnet 240 and the other end of which is directly connected to a manual shaft passing through an interior of the rotor shaft 180 and the torque transmitted by the reduction gear 400 is increased, transferred to a locking plate, and a control 250 which are in the housing 150 and a position of the output shaft from the encoder magnet 240 recorded.

[0027] The control 250 includes a position sensor 251 , which is arranged so that it faces the encoder magnet 240 facing, and a Hall effect sensor 252 , which is arranged so that it faces the engine sensor magnet 230 is facing.

[0028] As described above, according to the embodiment of the present invention, a function of detecting the position of the switching stage using the encoder magnet 240 , which is located at one end of the output shaft 80 is attached, and using the control 250 , serve as the lock switch according to the conventional method and replace it, thereby reducing costs.

[0029] A brushless DC electric motor (BLDC motor) or a switched reluctance motor (SR motor) is used as a motor 300 according to the embodiment of the present invention.

[0030] The control 250 according to the embodiment of the present invention comprises the position sensor 251 and the Hall effect sensor 252 as described above and is in the housing 150 arranged. The control 250receives information about the rotational position of the motor 300 from the engine sensor magnet 230 , which is adjacent to the engine 300 and detects a position of the rotor.

[0031] A force (rotational speed) formed by reducing a force of the motor that rotates the rotor shaft 180 through the reduction gear as an axis rotates, is transferred to the output shaft 80 transmitted and the encoder magnet 240 , which is located at one end of the output shaft 80 transmits information of a rotation angle of the output shaft 80 to the position sensor 251 the control 250 .

[0032] In this case, the control checks 250 embedded in the SBW device, a position of the rotation angle of the output shaft 80 using an output value from the position sensor 251, performs a function such as moving to or stopping at a specific position and enables a transmission to switch from a P stage to an R, N, or D stage or from a D stage to a P stage, and at the same time provides (displays) a current position of the rotation angle to the upper control and to the driver in the form of "P", "R", "N" or "D".

[0033] A current flows into the motor 300 using the control 250 and the engine 300 generates torque (power) using a current applied to a stator and an electromagnetic force generated between permanent magnets of the rotor.

[0034] The stator, rotor and other components of the motor are located between the housing 150and the engine cover to block the entry of external force, moisture or dust.

[0035] The rotor shaft 180 is at the torque of the engine 300 involved and the output shaft 80 is involved in the torque of an actuating device. The rotor shaft 180 transmits the torque generated by the engine 300 is generated by a hollow eccentric shaft thereof.

[0036] The reduction gear 400 according to the embodiment of the present invention includes a cycloidal gear that rotates according to the eccentricity and transmits power to the output shaft according to the eccentricity.

[0037] The reduction gear 400 increases the torque produced by the engine 300is transmitted according to a reduction ratio according to a pitch circle diameter (PCD) and the number of teeth of both the internal gear 90 as well as the external gear 60 and transfers the increased torque to the output shaft.

[0038] The gearbox cover 30 of the reduction gear 400 carries the external gear 60 and the bearing carries the internal gear 90 and thus it is possible to rotate and / or fix the gearbox.

[0039] As described above, the internal gear 90 of the reduction gear 400 eccentrically assembled so that the converted torque is transmitted to the output shaft according to the eccentricity.

[0040] A space where gearbox and other components are assembled is between the gearbox cover 30 and the engine cover 100intended to block the entry of external force, moisture or dust.

[0041] The control 250 according to the embodiment of the present invention uses preset reference data to determine the position of the output shaft from the encoder magnet 240 to detect, check the current position of the switching stage and the movement of the motor 300 to control.

[0042] That is, according to the embodiment of the present invention, the encoder magnet 240 provided at one end of the output shaft and the control 250 that fit into the housing 150 integrated, detects the position of the output shaft from the encoder magnet 240 and serves as a lock switch, thereby replacing the lock switch according to the related art. Therefore, the number of components can be reduced, and thus a cost reduction can be expected.

[0043] As described above, the rotor shaft 180 formed in a hollow design and the output shaft runs through the interior of the rotor shaft 180 and extends to an area where the control 250 is positioned, and thus the control 250 the position of the manual shaft, which is directly connected to the output shaft 80 connected. Therefore, it is possible to minimize an error caused by backlash of the reduction gear.

[0044] Fig. 5 is a view illustrating a structure for preventing detachment of a detection plate of the SBW device according to the embodiment of the present invention.

[0045] According to the related art, there is a problem that a detection plate may be detached due to vibration or external force in a direction of a shaft, and thus it is not possible to check the position of the motor during the detachment for controlling, and it is not possible to switch.

[0046] A detection plate 260 according to the embodiment of the present invention is composed so that it is forced between a stamping and a hole of the rotor core 200 and between the rotor core 200 and the bearing. Therefore, the detection plate 260 resistant to vibration or external force and prevents the motor sensor magnet from 230 solves.

[0047] With reference to Fig. 2 to Fig. 4 is the engine sensor magnet 230according to the embodiment of the present invention, a component that includes the Hall effect sensor 252 about the rotational position of the rotor. When the motor sensor magnet 230 is shifted out of position in a lateral direction, it is not possible to steer and switch.

[0048] The detection plate 260 according to the embodiment of the present invention has an end portion arranged in a curved shape, such as an “L” shape, to prevent the lateral detachment of the engine sensor magnet 230 to prevent.

[0049] Fig. 6 is a flowchart illustrating a switching method using the SBW device according to the embodiment of the present invention.

[0050] Before the Fig.As described in the switching method shown in Figure 6, when a P-stage position is detected, it is determined whether an IG start signal is input. If the IG start signal is not input, the SBW device enters a standby state, and when the IG start signal is input, a start relay operation signal is output.

[0051] When a driver selects one of the R, N and D levels, the TCU transmits at step S100 , Request information for positioning a lever at the R, N, or D stage using a position of the selected stage, and an SBW actuator control unit (SCU) receives the request information.

[0052] The SCU is located in the housing of the SBW device and applies a current to the motor to generate power (S200).

[0053] At step S200the motor rotates the output shaft around the P, R, N or D position using the generated power and transmits the power to the manual shaft.

[0054] In this case, the torque of the motor is transmitted through the hollow rotor shaft and the torque, increased by the reduction gear, is transmitted to the detent plate through the output shaft which passes through the interior of the rotor shaft and is directly connected to the manual shaft.

[0055] The SCU detects a rotational position of the motor and a position of the output shaft in real time, stops driving the motor, and then transmits information about the gear stage to the TCU ( S300 ).

[0056] In this case, the SCU receives the rotational position of the motor from the motor sensor magnet located adjacent to the motor, detects the position of the rotor, and detects the position of the output shaft from an encoder magnet located on one end of the output shaft.

[0057] That is, according to the embodiment of the present invention, the encoder magnet is provided at one end of the output shaft and the SCU integrated into the housing of the SBW device detects the position of the output shaft from the encoder magnet 240 and serves as a lock switch, thereby replacing the lock switch according to the related art with the encoder magnet. Therefore, the number of components can be reduced, thereby reducing costs.

[0058] Although the present invention has been described with reference to exemplary embodiments, it will be apparent to those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the present invention. Therefore, the exemplary embodiments should be considered in a descriptive sense only and not for purposes of limitation. The scope of the present invention is defined not only by the detailed description of the present invention but also by the appended claims, and all modifications and equivalents which fall within the scope of the appended claims are deemed to be included in the present invention.

Claims

[1] A shift-by-wire (SBW) device having the following features: a housing; a motor configured to generate torque using a current applied thereto; a rotor shaft in a hollow design; a reduction gear configured to receive the generated torque of the motor, convert the generated torque, and transmit the converted torque to an output shaft; an output shaft having one end provided with an encoder magnet and the other end directly connected to a manual shaft passing through an interior of the rotor shaft and transmitting the torque increased by the replacement gear to a detent plate; and a controller disposed in the housing and detecting a position of the output shaft from the encoder magnet. [2] The SBW device according to claim 1, wherein the controller comprises a position sensor arranged to face the encoder magnet and a Hall effect sensor arranged to face a motor sensor magnet. [3] The SBW device according to claim 2, wherein the controller receives information about a rotational position of the motor from the motor sensor magnet that is arranged adjacent to the motor and detects a position of a rotor. [4] The SBW device according to claim 2, wherein the motor sensor magnet is tightly fitted into a hole of a rotor core and has one end fixed by a detection plate formed in a curved shape such as an "L" shape so that lateral detachment thereof is prevented. [5] The SBW device according to claim 1, wherein the rotor shaft transmits the torque of the motor through a hollow eccentric shaft. [6] The SBW device according to claim 1, wherein the reduction gear comprises a cycloidal gear that rotates according to an eccentricity to transmit power to the output shaft according to the eccentricity. [7] The SBW device according to claim 1, wherein the controller uses preset reference data to detect the position of the output shaft from the encoder magnet, check a current position of a shift stage, and control an operation of the motor. [8] A switching method using a shift-by-wire (SBW) device, comprising the following steps: a) a step of receiving an operation request from a gear ratio controller in response to a driver's selection between a P, R, N and D stage; b) a step of applying a current to a motor to generate power, rotating an output shaft by a position of the selected gear stage, and transmitting the power to a manual shaft, through an SBW actuator control arranged in a housing of the SBW device; and c) a step of detecting a rotational position of the motor and a position of an output shaft in real time, stopping the driving of the motor, and then transmitting information about the gear stage to the gear ratio controller, by the SBW actuator controller. [9] The switching method according to claim 8, wherein in step b) the torque of the motor is transmitted through a rotor shaft in a hollow design and the torque increased by a reduction gear is transmitted to a detent plate through the output shaft passing through an interior of the rotor shaft and directly connected to the manual shaft. [10] The switching method according to claim 8, wherein in step c) the rotational position of the motor is received by a motor sensor magnet arranged adjacent to the motor so that a position of a rotor is detected and the position of the output shaft is detected by an encoder magnet arranged at one end of the output shaft.