Transmission, head-up display device, and computer-readable storage medium

Abstract

The application provides a transmission device, a head-up display device and a computer readable storage medium. The transmission device is used in the head-up display device and comprises a base, a carrier, a driving mechanism, a damping member and a controller. The carrier is movably arranged on the base and is used for carrying an optical reflection member. The driving mechanism is in transmission connection with the carrier to drive the carrier to move relative to the base. The damping member is connected between the base and the carrier and is used for exerting a damping force on the movement of the carrier relative to the base. The controller is configured to control the damping member according to the vibration of the base to adjust the damping force exerted by the damping member. The transmission device can reduce the influence of the vibration of the base on the position stability of the optical reflection member while realizing the position adjustment of the optical reflection member, so that the virtual image formed by the head-up display device is more stable.

Description

Technical Field

[0001] This application relates to the field of automotive electronics technology, and more specifically, to transmission devices, head-up display devices, and computer-readable storage media. Background Technology

[0002] Head-up displays can project vehicle speed, navigation, and other driving information onto the vehicle's windshield and create a virtual image in front of the vehicle, making it easier for the driver to obtain driving information in front of their line of sight.

[0003] Bumps and vibrations generated during vehicle movement may be transmitted to the head-up display (HUD) and affect its imaging stability. Summary of the Invention

[0004] This application provides a transmission device, a control method, a head-up display device, and a computer-readable storage medium, which can reduce the impact of vehicle vibration on the imaging stability of the head-up display device.

[0005] This application provides a transmission device in a first aspect. The transmission device is used in a head-up display device and includes a base, a carrier, a drive mechanism, a damping member, and a controller. The carrier is movably disposed on the base and is used to carry an optical reflector. The drive mechanism is drively connected to the carrier to drive the carrier to move relative to the base. The damping member is connected between the base and the carrier to apply a damping force to the movement of the carrier relative to the base. The controller is configured to control the damping member according to vibrations of the base to adjust the damping force applied by the damping member.

[0006] By using damping components to apply damping force to the movement of the support component relative to the base, the controller adjusts the damping force according to the vibration of the base, thereby reducing the impact of vehicle vibration on the positional stability of the optical reflector and making the virtual image formed by the head-up display device more stable.

[0007] This application provides a head-up display device in a second aspect. The head-up display device includes an optical reflector, an image generating unit, and a transmission device according to a first aspect. The optical reflector is supported by a carrier member of the transmission device. Light emitted by the image generating unit is reflected by the optical reflector and then emitted to form a virtual image.

[0008] This application provides a computer-readable storage medium in a third aspect. The computer-readable storage medium stores a computer program that, when executed by a processor, implements a control method applied to a transmission device according to the first aspect. The control method includes: controlling a drive mechanism to drive a carrier member to move relative to a base to adjust the position of an optical reflector carried by the carrier member; and controlling a damping member based on vibrations of the base to adjust the damping force applied by the damping member. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. It is understood that the accompanying drawings in the following description are only some embodiments of this application.

[0010] Figure 1 This is a schematic diagram of the optical path of a head-up display device provided in an embodiment of this application.

[0011] Figure 2 This is a schematic diagram of the overall structure of the transmission device provided in the embodiments of this application.

[0012] Figure 3 This is a schematic diagram of the detection and locking structure of the transmission device provided in the embodiments of this application.

[0013] Figure 4 This is a partial structural diagram of the position sensor provided in an embodiment of this application.

[0014] Figure 5 This is a partial structural diagram of the locking mechanism provided in an embodiment of this application.

[0015] Figure 6 This is a schematic diagram of the drive mechanism provided in an embodiment of this application.

[0016] Figure 7 This is a schematic diagram showing the connection relationship between the lead screw, nut, and bearing housing provided in an embodiment of this application.

[0017] Figure 8 This is a cross-sectional schematic diagram of the damping component provided in an embodiment of this application.

[0018] Figure 9 This is an exploded view of the damping component provided in an embodiment of this application.

[0019] Figure 10 This is a flowchart illustrating the control method provided in an embodiment of this application. Detailed Implementation

[0020] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0021] Head-up displays (HUDs) can project images of vehicle speed, navigation, and driver assistance prompts onto the windshield, creating a virtual image for the driver to see. This allows drivers to access driving information without looking down at the instrument cluster or central control screen.

[0022] In different driving scenarios, drivers may have different needs regarding the distance to the virtual image, the field of view, or the position of the visible area. For example, in highway scenarios, drivers typically focus on road information further away. In urban road scenarios, drivers may need to focus on navigation, lane, or obstacle cues closer to the vehicle. Drivers of different heights or in different seating positions may also perceive the virtual image's position in their field of vision differently. Therefore, head-up display devices can change the position of the optical reflectors involved in imaging to alter the distance to the virtual image, the field of view, or the position of the visible area.

[0023] During vehicle operation, the vehicle body is prone to bumps and vibrations when traversing potholes, speed bumps, or uneven road surfaces. Acceleration, braking, steering, or operation of the powertrain can also cause vibrations. Head-up displays (HUDs) are typically mounted on the vehicle's dashboard, crossbeams, or other body support structures. Bumps and vibrations generated by the vehicle body can be transmitted through these structures to the HUD, and further to the optical reflectors within the HUD that participate in imaging.

[0024] When optical reflectors involved in imaging are subjected to vibration, their position or orientation may deviate from their designed state. Since optical reflectors reflect image light, changes in their position or orientation alter the propagation path of the image light. The position of the virtual image observed by the driver will also change accordingly, resulting in virtual image jitter. Strong or prolonged vibrations may also cause problems such as ghosting, blurred display, or unstable display position.

[0025] Let's combine the following... Figure 1 Explain the overall optical path structure of the head-up display device 1000.

[0026] like Figure 1 As shown, the head-up display device 1000 is used in a vehicle. The head-up display device 1000 includes a transmission device 100, an image generation unit 200, and a second optical reflector 300. The transmission device 100 carries the first optical reflector 130. The windshield 400 is, for example, the windshield of a vehicle. The image generation unit 200 emits image light. The first optical reflector 130 is located in the propagation path of the image light emitted by the image generation unit 200. The second optical reflector 300 is located in the optical path between the first optical reflector 130 and the windshield 400.

[0027] The first optical reflector 130 can be a planar optical reflector, or a small optical reflector. The second optical reflector 300 can be an optical reflector with optical power, or a large optical reflector.

[0028] Image light emitted by the image generation unit 200 is reflected by the first optical reflector 130 and then directed to the second optical reflector 300. After being reflected by the second optical reflector 300, it is directed to the windshield 400. The image light, after being reflected by the windshield 400, enters the driver's observation area and forms a virtual image in front of the vehicle, enabling the driver to obtain driving information in front of their line of sight.

[0029] The first optical reflector 130 and the second optical reflector 300 can deflect the propagation path of image light. As a result, the head-up display device 1000 can form the required optical path within a limited installation space, which is beneficial to improving the utilization rate of the internal space of the head-up display device 1000.

[0030] The image generation unit 200 may include a backlight module and an imaging device located on the light-emitting side of the backlight module. The imaging device may be a liquid crystal display (LCD), a digital light processing (DLP) device, or a liquid crystal on silicon (LCoS) device. A liquid crystal display (LCD) device is also called a liquid crystal display (LCD) device. A digital light processing (DLP) device is also called a digital light processing (DLP) device. A liquid crystal on silicon (LCoS) device is also called a liquid crystal on silicon (LCoS) device.

[0031] exist Figure 1 In the structure shown, the transmission device 100 carries the first optical reflector 130. The transmission device 100 is used to adjust the position of the first optical reflector 130 in the optical path to change the optical path between the image generation unit 200 and the second optical reflector 300, thereby changing the virtual image distance or field of view. The head-up display device 1000 can thus achieve continuous zoom.

[0032] The optical reflector carried by the transmission device 100 is not limited to the first optical reflector 130. Depending on the optical design of the head-up display device 1000, the transmission device 100 may also carry the second optical reflector 300, or other optical reflectors in the head-up display device 1000 that participate in imaging and require position adjustment. The structure and operation of the transmission device 100 are described below using the example of the transmission device 100 carrying the first optical reflector 130. Except in cases contradicting the optical design or structural arrangement, the descriptions below regarding the position adjustment, vibration suppression, and position locking of the first optical reflector 130 also apply to other optical reflectors carried by the transmission device 100. The adjustable range of the virtual image distance and the virtual image field of view can be determined according to the optical design of the head-up display device 1000.

[0033] The head-up display 1000 is installed inside the vehicle. The ambient temperature inside the vehicle can be maintained at approximately... The temperature range is from 40°C to approximately 85°C. The transmission device 100 can operate within approximately... The position of the optical reflector can be adjusted within an ambient temperature range of approximately 40°C to 85°C.

[0034] The following is combined Figure 2 Explain the overall structure of the transmission device 100.

[0035] See Figure 2 The transmission device 100 includes a base 110, a support member 120, a drive mechanism 140, a damping member 150, and a controller 160. The base 110 serves as the mounting foundation for the transmission device 100 and provides mounting positions for the support member 120, the drive mechanism 140, and the damping member 150. The support member 120 is disposed on the base 110 and is movable relative to the base 110. The support member 120 is used to support optical reflectors. Figure 2 In the structure shown, the optical reflector carried by the carrier 120 is the first optical reflector 130.

[0036] A drive mechanism 140 is driveably connected to a support member 120. The drive mechanism 140 drives the support member 120 to move relative to the base 110 to adjust the position of the first optical reflector 130. A damping member 150 is connected between the base 110 and the support member 120. The damping member 150 applies a damping force to the movement of the support member 120 relative to the base 110, and the damping force applied by the damping member 150 is adjustable. A controller 160 is electrically connected to the damping member 150. The controller 160 controls the damping member 150 according to the vibration of the base 110 to adjust the damping force applied by the damping member 150.

[0037] In this way, the transmission device 100 can adjust the positions of the carrier 120 and the first optical reflector 130 through the drive mechanism 140, and can also apply an adjustable damping force to the movement of the carrier 120 relative to the base 110 through the damping member 150. When vehicle vibration is transmitted to the base 110, the transmission device 100 can suppress positional fluctuations of the carrier 120 and the first optical reflector 130.

[0038] See Figure 3 The transmission device 100 also includes a vibration sensor 170, a locking mechanism 180, and a position sensor 190. The vibration sensor 170 is disposed on the base 110 and is used to detect the vibration acceleration of the base 110 and output a vibration detection signal. The position sensor 190 is used to detect the position of the carrier 120 relative to the base 110 and output a position detection signal. The locking mechanism 180 is used to restrict the movement of the carrier 120 relative to the base 110 when the carrier 120 is in the target position. Figure 3 The first optical reflector 130, carried by the carrier 120, is also shown.

[0039] Figure 3 The first direction X is also shown. The first direction X is the direction in which the carrier 120 moves relative to the base 110. The first direction X is a straight line. The first direction X is only used to illustrate the relative positional relationship of the components in the illustrated structure and does not limit the installation direction or usage state of the transmission device 100 in the vehicle.

[0040] See Figure 3 The carrier 120 and the base 110 can be movably connected via a first linear guide rail 112 and a second linear guide rail 114. The first linear guide rail 112 and the second linear guide rail 114 are parallel to each other and extend along a first direction X. The first linear guide rail 112 and the second linear guide rail 114 together guide the movement of the carrier 120 relative to the base 110, enabling the carrier 120 to move relative to the base 110 along the first direction X.

[0041] The first linear guide rail 112 and the second linear guide rail 114 can be respectively disposed on both sides of the support member 120. As a result, the support member 120 is guided by both sides during movement, which helps to reduce the sway of the support member 120 and reduce the attitude fluctuation of the first optical reflector 130 during the position adjustment process.

[0042] Both the first linear guide rail 112 and the second linear guide rail 114 may include a slide rail portion and a slide groove portion that slide against each other. The slide rail portion may be disposed on one of the support member 120 and the base 110, and the slide groove portion may be disposed on the other of the support member 120 and the base 110. For example, the slide rail portion may be disposed on the support member 120, and the slide groove portion may be a slide groove disposed on the base 110. After the slide rail portion and the slide groove are matched and connected, the support member 120 can slide relative to the base 110 along the first direction X. As long as the linear movement of the support member 120 relative to the base 110 can be guided, the specific structure of the linear guide rail is not limited.

[0043] See Figure 4 The position sensor 190 may include a grating ruler 191 and a photoelectric reading sensor 192. The grating ruler 191 is disposed on the base 110. The photoelectric reading sensor 192 is disposed on the carrier 120 and is electrically connected to the controller 160. When the carrier 120 moves relative to the base 110, the photoelectric reading sensor 192 moves with the carrier 120 and reads the position information on the grating ruler 191 to detect the position of the carrier 120 relative to the base 110.

[0044] The grating ruler 191 can be fixed to the base 110 by adhesive, screws, or snap-fit. The photoelectric reading sensor 192 can be fixed to the carrier 120 by screws. After the grating ruler 191 and the photoelectric reading sensor 192 are used together, they can provide a position detection signal to the controller 160, so that the controller 160 can control the drive mechanism 140 according to the position detection signal.

[0045] See Figure 5 The locking mechanism 180 includes a first locking member 181 and at least one second locking member 182. The first locking member 181 is connected to the carrier member 120. The second locking member 182 is disposed on the base 110. Figure 5 In the illustrated embodiment, two second locking members 182 are provided on the base 110, and the two second locking members 182 are spaced apart along the moving direction of the carrier 120 relative to the base 110. When the carrier 120 moves to different target positions, the first locking member 181 can be aligned with the corresponding second locking member 182. After the first locking member 181 cooperates with the corresponding second locking member 182, it can restrict the movement of the carrier 120 relative to the base 110, so that the carrier 120 is kept in the corresponding target position.

[0046] exist Figure 5 In the structure shown, the first locking element 181 is an electromagnetic attractor, and the second locking element 182 is a permanent magnet. Figure 2 The first locking element 181 is electrically connected to the controller 160. After the carrier 120 moves to the target position, the controller 160 supplies power to the first locking element 181. After the first locking element 181 is energized, it generates a magnetic field and attracts the corresponding second locking element 182, thereby restricting the movement of the carrier 120 relative to the base 110.

[0047] When the position of the carrier 120 needs to be readjusted, the controller 160 stops supplying power to the first locking member 181 or reduces the current flowing through the first locking member 181. After the locking force between the first locking member 181 and the corresponding second locking member 182 is reduced, the drive mechanism 140 can drive the carrier 120 to move relative to the base 110.

[0048] The first locking element 181 can be fixed to the carrier 120 by screws or threaded connectors. The second locking element 182 can be fixed to the base 110 by adhesive, screws, or snap-fit ​​structures. The number and position of the second locking elements 182 can be determined according to the target position number and adjustment stroke of the carrier 120. The locking mechanism 180 can also adopt a hook and slot, pin and hole, or other mating structure that can restrict the movement of the carrier 120 relative to the base 110. The locking force between the first locking element 181 and the second locking element 182 can be determined according to the mass of the first optical reflector 130, vehicle vibration conditions, and the adjustment stroke of the carrier 120.

[0049] Combination Figures 2 to 5 When the transmission device 100 is working, the locking of the bearing member 120 can be released first, and then the position of the first optical reflector 130 can be adjusted.

[0050] When the position of the first optical reflector 130 needs to be adjusted, the controller 160 causes the locking mechanism 180 to release the lock on the carrier 120. Figure 5 Taking the electromagnetic attraction structure shown as an example, the controller 160 stops supplying power to the first locking member 181, or reduces the current flowing through the first locking member 181, thereby reducing the locking force between the first locking member 181 and the second locking member 182.

[0051] After the locking mechanism 180 is released, the controller 160 controls the drive mechanism 140 to operate. The drive mechanism 140 drives the carrier 120 to move relative to the base 110, and the carrier 120 drives the first optical reflector 130 to move. The position sensor 190 detects the position of the carrier 120 relative to the base 110 and outputs a position detection signal to the controller 160. The controller 160 controls the drive mechanism 140 according to the position detection signal, so that the carrier 120 moves to the target position.

[0052] After the carrier 120 moves to the target position, the controller 160 controls the drive mechanism 140 to stop working and controls the locking mechanism 180 to lock the carrier 120. Figure 5 Taking the electromagnetic attraction structure shown as an example, the controller 160 supplies power to the first locking member 181. After the first locking member 181 is energized, it engages with the second locking member 182, keeping the carrier member 120 in the target position.

[0053] During vehicle operation, vibrations generated by the vehicle may be transmitted to the base 110. Vibration sensor 170 detects the vibration acceleration of the base 110 and outputs a vibration detection signal to controller 160. Controller 160 controls damping element 150 based on the vibration detection signal to adjust the damping force applied by damping element 150 between base 110 and bearing element 120.

[0054] During the movement of the support member 120, the controller 160 can control the damping member 150 to apply a first damping force to reduce the influence of the damping member 150 on the movement of the support member 120. When the vibration acceleration of the base 110 is greater than or equal to a predetermined acceleration threshold, the controller 160 can control the damping member 150 to apply a second damping force. The second damping force is greater than the first damping force to suppress positional fluctuations of the support member 120 and the first optical reflector 130.

[0055] With the above settings, the transmission device 100 can reduce the resistance to the movement of the support member 120 during the position adjustment process, and can improve the suppression effect on the support member 120 when the vehicle vibration is strong, thereby taking into account both the stability of the position adjustment of the first optical reflector 130 and the stability of the virtual image display.

[0056] See Figure 6The drive mechanism 140 includes a motor 141, a synchronous belt drive assembly 142, a lead screw 146, a nut 147, and a bearing housing 148. The motor 141 can be fixed to the base 110 by screws. Exemplarily, the motor 141 may have a mounting through hole, and the base 110 may have screw holes corresponding to the mounting through hole. Screws pass through the mounting through hole and engage with the screw holes to fix the motor 141 to the base 110. The motor 141 is used to output rotary motion. The synchronous belt drive assembly 142 connects the motor 141 and the lead screw 146 and is used to transmit the rotary motion output by the motor 141 to the lead screw 146. The nut 147 is threadedly engaged with the lead screw 146 and is used to move axially along the lead screw 146 when the lead screw 146 rotates.

[0057] Motor 141 can be a stepper motor. The output shaft rotation angle of a stepper motor is easy to control, thereby facilitating the control of the movement of the support component 120. Motor 141 can also be a servo motor or other motors capable of outputting rotary motion.

[0058] The synchronous belt drive assembly 142 includes a drive pulley 143, a synchronous belt 144, and a driven pulley 145. The drive pulley 143 is connected to the output shaft of the motor 141 and can rotate with the output shaft of the motor 141. The drive pulley 143 and the output shaft of the motor 141 can be connected by a key, interference fit, set screw, or other rigid connection method. The synchronous belt 144 is wound around the drive pulley 143 and the driven pulley 145. When the drive pulley 143 rotates, it drives the driven pulley 145 to rotate through the synchronous belt 144. The driven pulley 145 is connected to a lead screw 146 and drives the lead screw 146 to rotate.

[0059] The inner side of the synchronous belt 144 may be provided with teeth. The outer circumferences of the driving pulley 143 and the driven pulley 145 may be provided with teeth that mesh with the teeth of the synchronous belt 144. Thus, the synchronous belt 144 can form a toothed fit with the driving pulley 143 and the driven pulley 145, reducing slippage during transmission. Compared to direct gear meshing transmission, the synchronous belt drive assembly 142 helps reduce the impact of meshing shock on transmission smoothness and also helps reduce noise.

[0060] For example, the timing belt 144 can be a carbon fiber reinforced polyurethane timing belt. This timing belt 144 has a small elongation, which helps maintain transmission accuracy after temperature changes or long-term use. The number of teeth and diameter of the driving pulley 143 and the driven pulley 145 can be set according to the required transmission ratio of the drive mechanism 140. The timing belt drive assembly 142 can adjust the speed and torque output from the motor 141 to the lead screw 146 through the transmission ratio between the driving pulley 143, the timing belt 144, and the driven pulley 145 to meet the needs of controlling the movement of the load-bearing component 120.

[0061] See Figure 7 The bearing housing 148 is fixed to the base 110. The lead screw 146 passes through the bearing housing 148 and is rotatably supported on the base 110 via the bearing housing 148. The driven pulley 145 is connected to one end of the lead screw 146. When the driven pulley 145 rotates, the lead screw 146 rotates with the driven pulley 145.

[0062] Nut 147 is fitted onto lead screw 146 and threadedly engages with it. Nut 147 is also fixedly connected to bearing member 120. When lead screw 146 rotates, nut 147 moves along the axial direction of lead screw 146, causing bearing member 120 to move relative to base 110. The axial direction of lead screw 146 can be parallel to the first direction X. Bearing member 120 moves along the first direction X under the constraint of the guide structure, thereby causing first optical reflector 130 to move.

[0063] exist Figure 7 In the example shown, the lead screw 146 has an external thread, and the nut 147 has an internal thread that mates with the external thread of the lead screw 146. The nut 147 may also have an external mating surface. The carrier 120 has a shaft hole that splines into the external mating surface to restrict the rotation of the nut 147 relative to the carrier 120. The nut 147 mates with the shaft hole of the carrier 120 via the external mating surface and can be fixed to the carrier 120 by screws.

[0064] Rolling elements and a lubricating medium can be installed between the lead screw 146 and the nut 147. As a result, the transmission backlash between the lead screw 146 and the nut 147 is small, which helps to maintain smooth transmission over a wide temperature range.

[0065] For example, the rolling element can be a ball. A helical raceway is formed between the external thread of the lead screw 146 and the internal thread of the nut 147, and the ball is rotatably accommodated within the helical raceway. When the lead screw 146 rotates, the ball rolls within the helical raceway, causing rolling contact between the lead screw 146 and the nut 147 to replace sliding contact, and converting the rotation of the lead screw 146 into axial movement of the nut 147. The ball can abut against the external thread of the lead screw 146 and the internal thread of the nut 147 respectively, thereby reducing the axial clearance between the lead screw 146 and the nut 147. As a result, the friction and clearance between the lead screw 146 and the nut 147 are reduced, and the transmission backlash is correspondingly reduced. This is beneficial for improving the accuracy of the position adjustment of the bearing component 120, and also helps to reduce the wear of the lead screw 146 and the nut 147, extending their service life.

[0066] The lubricating medium can be grease, which is filled between the lead screw 146 and the nut 147. In some embodiments, the grease can be solid grease. Solid grease can lubricate the rolling contact between the ball and the lead screw 146 and the nut 147 over a wide temperature range, so that the transmission between the lead screw 146 and the nut 147 remains smooth in low and high temperature environments.

[0067] Alternatively, lead screw 146 and nut 147 can also adopt threaded transmission structures such as trapezoidal lead screw and trapezoidal nut, as long as the rotational motion of lead screw 146 can be converted into linear motion of nut 147.

[0068] The bearing housing 148 can be fixed to the base 110 with screws. The bearing housing 148 may have a through hole for the lead screw 146 to pass through. The bearing housing 148 may also have a through hole for a portion of the damping element 150 to pass through, or a connecting hole for mounting the damping element 150. Thus, the bearing housing 148 can both support the lead screw 146 and provide a mounting position for the damping element 150, which helps to reduce the structural space occupied by the transmission device 100.

[0069] The lead of the lead screw 146 can be set with control accuracy and speed according to the movement of the support member 120. The stroke of the support member 120 relative to the base 110 can be set according to the required position adjustment range of the optical reflector.

[0070] When the drive mechanism 140 is working, the motor 141 drives the drive pulley 143 to rotate. The drive pulley 143 drives the driven pulley 145 to rotate via the synchronous belt 144. The driven pulley 145 drives the lead screw 146 to rotate. After the lead screw 146 rotates, the nut 147 moves along the axial direction of the lead screw 146, and drives the carrier 120 and the first optical reflector 130 to move relative to the base 110. The controller 160 controls the amount of movement of the carrier 120 by controlling the rotation angle of the output shaft of the motor 141, thereby controlling the position of the first optical reflector 130.

[0071] With the above configuration, the drive mechanism 140 can convert the rotational motion of the motor 141 into the linear motion of the carrier 120. The synchronous belt drive assembly 142 helps to reduce transmission shock and noise. The cooperation between the lead screw 146 and the nut 147 helps to improve the control accuracy of the movement of the carrier 120. The cooperative structure of the synchronous belt 144, lead screw 146, and nut 147 also helps to reduce transmission backlash, making the position adjustment process of the first optical reflector 130 smoother.

[0072] See Figure 8 The damping element 150 is a magnetorheological damper. The damping element 150 includes a magnetorheological fluid 151, a coil 152, a coil support 153, a guide ring 154, a telescopic rod 155, a housing 156, and a buffer diaphragm 157. A cavity is formed inside the housing 156, and the magnetorheological fluid 151 fills the cavity. The coil support 153 is disposed within the cavity. The coil 152 is wound around the coil support 153 and fixed within a circular groove on the outer periphery of the coil support 153. The guide ring 154 is disposed on the outer periphery of the coil support 153. A gap is formed between the guide ring 154 and the coil support 153 for the magnetorheological fluid 151 to flow.

[0073] See Figure 8 and Figure 9 One end of the telescopic rod 155 extends out of the outer casing 156, and the other end is connected to the coil support 153. When the telescopic rod 155 extends or retracts relative to the outer casing 156, the coil support 153 moves with the telescopic rod 155. A first end cap 158 is provided at one end of the outer casing 156, and the telescopic rod 155 passes through the first end cap 158. A second end cap 159 is provided at the other end of the outer casing 156.

[0074] The damping element 150 also includes a first seal 158A, a second seal 159A, and a third seal 156A. The first seal 158A is disposed between the first end cap 158 and the telescopic rod 155 to seal the gap between them. The third seal 156A is disposed between the first end cap 158 and the outer shell 156 to seal the gap between them. The second seal 159A is disposed between the second end cap 159 and the outer shell 156 to seal the gap between them. The first seal 158A, the second seal 159A, and the third seal 156A can be O-rings to reduce the risk of leakage of the magnetorheological fluid 151. A buffer diaphragm 157 is disposed inside the outer shell 156 to buffer the instantaneous impact on the magnetorheological fluid 151.

[0075] Combination Figure 7 and Figure 8 A damping element 150 is connected between the base 110 and the support element 120. The outer shell 156 is fixed to the bearing seat 148. The bearing seat 148 is fixed to the base 110. One end of the telescopic rod 155 is connected to the support element 120. In some embodiments, the end of the telescopic rod 155 extending out of the outer shell 156 may have a first T-shaped fitting portion, and the support element 120 may have a second T-shaped fitting portion. The first T-shaped fitting portion and the second T-shaped fitting portion are nested together, connecting the telescopic rod 155 to the support element 120. When the support element 120 moves relative to the base 110, the support element 120 drives the telescopic rod 155 to extend and retract relative to the outer shell 156 through the first and second T-shaped fitting portions, and the telescopic rod 155 drives the coil support 153 to move. The magnetorheological fluid 151 flows within the gap between the guide ring 154 and the coil support 153. The flow resistance of the magnetorheological fluid 151 is transmitted to the carrier 120 through the coil support 153 and the telescopic rod 155, thereby forming a damping force that hinders the movement of the carrier 120 relative to the base 110.

[0076] The flow state of the magnetorheological fluid 151 changes with the magnetic field. When the coil 152 is not energized, the viscosity of the magnetorheological fluid 151 is low, and the damping force applied by the damping element 150 is small. Even when the coil 152 is not energized, the magnetorheological fluid 151 remains viscous. It flows within the gap between the guide ring 154 and the coil support 153, generating a viscous damping force to attenuate the high-frequency micro-amplitude vibrations transmitted from the base 110 to the telescopic rod 155, thereby isolating the influence of these vibrations on the first optical reflector 130 when the coil 152 is not energized. When the coil 152 is energized, it generates a magnetic field that acts on the magnetorheological fluid 151 between the guide ring 154 and the coil support 153. The viscosity of the magnetorheological fluid 151 increases, increasing the resistance experienced by the telescopic rod 155 when it extends or retracts relative to the outer shell 156, and consequently increasing the damping force applied by the damping element 150.

[0077] The controller 160 is electrically connected to the coil 152. The controller 160 adjusts the current flowing through the coil 152, thereby changing the magnetic field generated by the coil 152, and consequently adjusting the damping force applied by the damping element 150. When the carrier 120 starts to move or stops moving, the magnetorheological fluid 151 may be subjected to momentary impacts. The buffer diaphragm 157 can absorb at least part of the momentary impacts, thereby reducing the vibration of the first optical reflector 130 during start-up and shutdown.

[0078] The damping force applied by the damper 150 and the current in the coil 152 can be set according to the vehicle vibration conditions and the positional stability requirements of the first optical reflector 130. The response time of the damper 150 can be set according to the positional stability requirements under the vehicle vibration conditions.

[0079] The magnetorheological fluid 151 may include a base fluid and magnetic particles dispersed in the base fluid. The base fluid may be synthetic alkane oil. Synthetic alkane oil exhibits relatively balanced performance under high and low temperature environments, possesses oxidation resistance and good low-temperature fluidity, which is beneficial for the long-term stability of the magnetorheological fluid 151 in vehicle environments. The magnetic particles may be iron oxide particles. The particle size of the iron oxide particles may be from approximately 30 nm to approximately 100 nm. Iron oxide particles have the characteristics of stable sedimentation and are not prone to agglomeration, which is beneficial for the magnetorheological fluid 151 to maintain stable performance in applications requiring precise control of damping force. The damping element 150 may also be an electrorheological damper or other damping elements with adjustable damping force.

[0080] Vibration sensor 170 detects the vibration acceleration of base 110 and outputs a vibration detection signal to controller 160. Controller 160 adjusts the current flowing through coil 152 according to the vibration detection signal to adjust the damping force applied by damping element 150.

[0081] When the vibration acceleration of the base 110 is greater than or equal to a predetermined acceleration threshold, the controller 160 increases the current of the coil 152. The magnetic field generated by the coil 152 is enhanced, the viscosity of the magnetorheological fluid 151 increases, and the damping force applied by the damping element 150 increases accordingly, thereby suppressing the position fluctuations of the bearing element 120 and the first optical reflector 130.

[0082] When the vibration acceleration of the base 110 is less than a predetermined acceleration threshold, the controller 160 reduces the current of the coil 152, causing the damping element 150 to apply a smaller damping force. At this time, the damping element 150 provides less resistance to the movement of the support member 120, which is beneficial for the position adjustment of the first optical reflector 130.

[0083] For example, the predetermined acceleration threshold can be approximately three times the acceleration due to gravity. The predetermined acceleration threshold can be determined based on vehicle vibration conditions, the mass of the first optical reflector 130, and the stability requirements of the virtual image display.

[0084] The controller 160's control of the damper 150 is not limited to single threshold control. In one embodiment, the controller 160 controls the damper 150 to apply a first damping force when the vibration acceleration is less than a predetermined acceleration threshold, and controls the damper 150 to apply a second damping force when the vibration acceleration is greater than or equal to the predetermined acceleration threshold. The second damping force is greater than the first damping force.

[0085] In another approach, the controller 160 is configured with multiple predetermined acceleration thresholds. The controller 160 controls the damper 150 to apply different magnitudes of damping force based on the range of vibration acceleration.

[0086] In another embodiment, the controller 160 causes the damping force applied by the damper 150 to increase as the vibration acceleration increases. In this manner, the damper 150 can adjust its damping effect on the bearing 120 according to the degree of vibration of the base 110.

[0087] This application also provides a control method. This control method can be applied to the transmission device 100 and can be executed by the controller 160. Figure 10 An example of the execution of the control method is shown. Figure 10 Solid arrows in the diagram represent a main flow, while dashed arrows represent selectable steps and their relationship to the main flow. Figure 10 The connections shown are not intended to require that the steps be performed in the order illustrated. See also Figure 10 The control method includes the following steps.

[0088] In step S110, the control drive mechanism 140 drives the carrier 120 to move relative to the base 110 to adjust the position of the optical reflector carried by the carrier 120.

[0089] In some cases, the control method further includes step S120: detecting the position of the carrier 120 relative to the base 110, and controlling the locking mechanism 180 to lock the carrier 120 when the carrier 120 is in the target position, thereby fixing the carrier 120 relative to the base 110. Figure 10 In the execution example shown, step S120 is executed after step S110, and step S130 is performed after step S120 is completed.

[0090] In step S130, the damping force applied by the damping member 150 is adjusted according to the vibration control damping member 150 of the base 110.

[0091] In some cases, the control method further includes step S140: when the vibration acceleration of the base 110 is greater than or equal to a predetermined acceleration threshold, increasing the damping force applied by the damping element 150. Step S140 can be executed as a specific control method of step S130.

[0092] Figure 10 This is just one example of the control method, and there is no fixed execution order between the steps. Step S130 can be executed continuously during vehicle movement or according to a predetermined cycle, and is not contingent on the completion of steps S110 or S120. Step S120 can be executed after step S110, when the carrier 120 reaches the target position. Step S140 can be executed as a specific control method of step S130.

[0093] Specifically, when the position of the first optical reflector 130 needs to be adjusted, the controller 160 controls the drive mechanism 140 to operate. The drive mechanism 140 drives the carrier 120 to move relative to the base 110, and the carrier 120 drives the first optical reflector 130 to move. The position sensor 190 detects the position of the carrier 120 relative to the base 110 and feeds back a position detection signal to the controller 160. After the carrier 120 moves to the target position, the controller 160 controls the drive mechanism 140 to stop operating and controls the locking mechanism 180 to lock the carrier 120.

[0094] During vehicle operation, vibration sensor 170 detects the vibration acceleration of base 110 and outputs a vibration detection signal to controller 160. Controller 160 controls the damping force applied by damping element 150 based on the vibration detection signal. When the vibration acceleration of base 110 is greater than or equal to a predetermined acceleration threshold, controller 160 increases the damping force applied by damping element 150 to suppress positional fluctuations of bearing element 120 and first optical reflector 130.

[0095] This application embodiment also provides a computer-readable storage medium. A computer program is stored on the computer-readable storage medium. When the computer program is executed by a processor, it implements the control method. The processor can be the processor of the controller 160. The computer-readable storage medium may include read-only memory (ROM), random access memory (RAM), magnetic disk, optical disk, flash memory, or other media capable of storing computer programs.

[0096] With the above configuration, the transmission device 100 can adjust the position of the optical reflector carried by the carrier 120 via the drive mechanism 140, and adjust the damping force according to the vibration of the base 110 via the damping member 150. Therefore, during the movement of the carrier 120, the damping member 150 can provide minimal resistance to its movement; when the base 110 vibrates strongly, the damping member 150 can apply a larger damping force to suppress positional fluctuations of the carrier 120 and the optical reflector. Furthermore, the locking mechanism 180 can restrict the movement of the carrier 120 relative to the base 110 after it has moved to the target position. The position sensor 190 can detect the position of the carrier 120 relative to the base 110 and provide position feedback to the controller 160 for controlling the drive mechanism 140. The first linear guide rail 112 and the second linear guide rail 114 jointly guide the carrier 120, which helps to reduce the swaying of the carrier 120 during its movement. The above structures work together to improve the position adjustment accuracy and stability of the optical reflectors and reduce the impact of vehicle vibration on the stability of the virtual image display.

[0097] The above embodiments are used to illustrate the technical solution of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments or substitutions to the embodiments of this application without departing from the technical concept of this application. The scope of protection of this application is determined by the claims.

Claims

1. A transmission device, characterized in that, The transmission device is used for a head-up display device and includes: Base; A carrier member, which is movably disposed on the base and is used to support an optical reflector; A drive mechanism is connected to the carrier component to drive the carrier component to move relative to the base; A damping element, connected between the base and the support member, for applying a damping force to the movement of the support member relative to the base; and A controller configured to control the damping element based on vibrations of the base to adjust the damping force applied by the damping element.

2. The transmission device according to claim 1, characterized in that, The transmission device also includes a vibration sensor. The vibration sensor is disposed on the base to detect the vibration acceleration of the base, and the controller is configured to control the damping element according to the vibration acceleration to adjust the damping force.

3. The transmission device according to claim 2, characterized in that, The controller is configured to control the damping element to increase the damping force when the vibration acceleration is greater than or equal to a predetermined acceleration threshold.

4. The transmission device according to claim 1, characterized in that, The damping element includes a magnetorheological damper, which contains a magnetorheological fluid and a coil. The coil is used to generate a magnetic field that acts on the magnetorheological fluid, and the controller adjusts the damping force by controlling the current of the coil.

5. The transmission device according to claim 1, characterized in that, The drive mechanism includes a motor and a synchronous belt drive assembly, which includes a driving pulley, a synchronous belt, and a driven pulley. The driving pulley is connected to the output shaft of the motor, and the synchronous belt is wound around the driving pulley and the driven pulley.

6. The transmission device according to claim 5, characterized in that, The drive mechanism also includes a lead screw and a nut. The driven pulley is connected to the lead screw, the nut is threaded into the lead screw, and the nut is fixedly connected to the bearing member. When the lead screw rotates, the nut moves along the axial direction of the lead screw, thereby causing the bearing member to move relative to the base.

7. The transmission device according to claim 6, characterized in that, A rolling element and a lubricating medium are provided between the lead screw and the nut.

8. The transmission device according to claim 1, characterized in that, The transmission device further includes a locking mechanism, which comprises a first locking element and a second locking element. The first locking member is disposed on the carrier member, and the second locking member is disposed on the base. The first locking member and the second locking member cooperate to fix the carrier member and the base relative to each other.

9. The transmission device according to claim 1, characterized in that, The support member and the base are movably connected by two linear guide rails, and the two linear guide rails are parallel to each other.

10. A head-up display device, characterized in that, include: The image generation unit is used to emit image light; An optical reflector is used to reflect the image light so that the image light forms a virtual image through the windshield; as well as According to any one of claims 1 to 9, the transmission device is wherein the optical reflector is carried by a carrier of the transmission device.

11. The head-up display device according to claim 10, characterized in that, The optical reflector is a first optical reflector, and the head-up display device further includes a second optical reflector. The first optical reflector is located in the optical path between the image generation unit and the second optical reflector. The second optical reflector is used to reflect the image light reflected by the first optical reflector to the windshield. The second optical reflector is a reflector with optical power, and the first optical reflector is a planar reflector.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, implements a control method applied to the transmission device according to any one of claims 1 to 9, the control method comprising: The drive mechanism is controlled to move the carrier relative to the base to adjust the position of the optical reflector carried by the carrier. The damping element is controlled according to the vibration of the base to adjust the damping force applied by the damping element.

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