Vehicle-mounted curtain device and vehicle

Abstract

The utility model provides a vehicle-mounted curtain device and a vehicle. The vehicle-mounted curtain device comprises a shell; the curtain assembly is fixedly arranged on the shell and comprises a reel and a curtain, one end of the curtain is fixedly arranged on the reel, and the other end of the curtain is a movable end; the curtain motor is used for driving the reel; the first arm rod is provided with a first side rod and a second side rod which are hinged, one end of the first side rod is hinged to the shell, and one end of the second side rod is hinged to the movable end of the curtain; the second arm rod is provided with a third side rod and a fourth side rod which are hinged, one end of the third side rod is hinged to the shell, and one end of the fourth side rod is hinged to the movable end of the curtain; the first motor is used for driving the first side rod; the second motor is used for driving the third side rod; wherein the length of the first side rod is the same as that of the third side rod, and the length of the second side rod is the same as that of the fourth side rod. The structure is high in stability and high in external impact resistance and vibration resistance.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a vehicle-mounted curtain device and a vehicle. Background Art

[0002] Vehicles have become an essential means of transportation in our daily lives, and in-vehicle entertainment plays a crucial role in the passenger experience. Screen projection technology, combining a screen with a projector, is widely used for in-vehicle image and video playback. With the advancement of intelligent technology, the screen's infinite hovering function has become a key indicator of the customer experience. Existing in-vehicle screens have high strength requirements for the roller tube and synchronization rod components, resulting in poor stability within the limited vehicle design space. Utility Model Content

[0003] The present application provides a vehicle-mounted screen device and a vehicle, which helps to solve the problem of poor stability of existing vehicle-mounted screens. The following introduces various aspects of the present application.

[0004] In the first aspect, the present application provides a vehicle-mounted screen device, comprising: a shell; a screen assembly fixedly arranged on the shell, the screen assembly comprising a reel and a screen, one end of the screen being fixedly arranged on the reel, and the other end of the screen being a movable end; a screen motor fixedly arranged on the shell, for driving the reel of the screen assembly; a first arm having a first side rod and a second side rod hingedly connected, one end of the first side rod being hingedly arranged on the shell, and one end of the second side rod being hingedly connected to the movable end of the screen; a second arm having a third side rod and a fourth side rod hingedly connected, one end of the third side rod being hingedly arranged on the shell, and one end of the fourth side rod being hingedly connected to the movable end of the screen; a first motor for driving the first side rod to drive the first arm; a second motor for driving the third side rod to drive the second arm; wherein the length of the first side rod is the same as the length of the third side rod, and the length of the second side rod is the same as the length of the fourth side rod.

[0005] In a second aspect, the present application provides a vehicle comprising the vehicle-mounted curtain device as described in the first aspect.

[0006] In the embodiment of the present application, the left and right motors drive the left and right arms respectively, which can realize the lifting and lowering of the screen and the self-locking hovering function at any height within the use range. At any position when the screen is unfolded, by making the motors on both sides self-lock internally, the upper parts of the left and right arms are fixed, providing a downward pulling force for the screen. The screen motor provides an upward pulling force for the screen, which forms a balance with the force provided by the arms, so that the screen can achieve infinite hovering. The structure of the embodiment of the present application is stable and reliable, avoiding the high strength requirements of the mechanical synchronization mechanism, and has a strong ability to resist external shocks and vibrations. In the state of infinite hovering, the screen surface is stable, which facilitates the realization of better projection effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments of the present application.

[0008] Figure 1 It is a structural diagram of a vehicle-mounted screen provided by related technology.

[0009] Figure 2 This is a structural diagram of another vehicle-mounted screen provided by the relevant technology.

[0010] Figure 3 It is a structural schematic diagram of the vehicle-mounted screen device provided in an embodiment of the present application.

[0011] Figure 4 yes Figure 3 An exploded diagram of the vehicle-mounted curtain device is shown.

[0012] Figure 5 yes Figure 3 A three-view drawing of the vehicle-mounted screen device shown.

[0013] Figure 6 yes Figure 3 Schematic diagram of the hovering position of the vehicle-mounted curtain device shown.

[0014] Figure 7 yes Figure 3 A schematic diagram of a model of a vehicle-mounted screen device is shown.

[0015] Figure 8 yes Figure 3 A simplified schematic diagram of the curtain is shown.

[0016] Figure 9 yes Figure 3 Schematic diagram of the closed state of the vehicle-mounted curtain device shown.

[0017] Figure 10a-Figure 10b yes Figure 3 Schematic diagrams of some hovering states of the vehicle-mounted curtain device shown.

[0018] Figure 11 yes Figure 3 Schematic diagram of the retracted state of the vehicle-mounted curtain device shown.

[0019] Figure 12 yes Figure 3 Schematic diagram of the vehicle-mounted curtain device in the unfolded state.

[0020] Figure 13 yes Figure 3 A possible control flow diagram of a controller of a vehicle-mounted curtain device is shown.

[0021] Figure 14 It is a schematic diagram of the component units / partial component units of the vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. The same or similar reference numerals are used in the accompanying drawings to represent the same or similar modules. It should be understood that the accompanying drawings are only schematic and the scope of protection of the present application is not limited thereto.

[0023] Vehicles have become an essential means of transportation in our daily lives, and in-vehicle entertainment options optimize and enhance the passenger experience. To align with the trend toward carbon neutrality, new energy vehicles are entering a new phase of rapid development. As a mainstream development direction, electric vehicles have opened up a vast commercial space. Various entertainment products are enriching user needs on in-vehicle platforms. Among related technologies, screen projection technology, which combines screens and projectors, is being used for in-vehicle video playback.

[0024] With the advancement of intelligent technology, electronically controlled lift screens, an essential component of laser projection systems, need to be appropriately sized to suit various entertainment presentations, providing diverse projection effects. For example, a maximum-sized screen can be used for full-screen movie viewing, while a matching screen size can be used for displaying entertainment lyrics. The screen's infinite hovering function has become a key factor in the customer experience, and ensuring system stability is essential while achieving this.

[0025] Figure 1 This is a structural diagram of a vehicle-mounted screen provided by the relevant technology. Figure 1 As shown, the car-mounted screen requires manual operation and does not have an infinite hovering function, which affects the user experience.

[0026] Figure 2 This is a structural diagram of another vehicle-mounted screen provided by the related technology. Figure 2As shown, the vehicle-mounted screen 200 comprises a screen 210, an arm 220, a roller tube 230, and a synchronization rod 240. There is one arm 220 on each side, and each arm 220 can include a first support rod 221 and a second support rod 222 that are hingedly connected. Although the vehicle-mounted screen 200 has a stepless hovering function, its structure places high demands on the strength of the roller tube 230 and the synchronization rod 240. The roller tube 230 is prone to bending when subjected to large tension from the screen, and the synchronization rod 240 is prone to deformation due to large torque when transmitting force. However, the design of vehicle-mounted screens is often limited by the space available in the vehicle, and the available space is relatively limited, making it impossible to meet strength requirements by increasing the size of the components.

[0027] It can be seen that the vehicle-mounted curtain structure of the related art has high requirements on the strength of the roller tube 230 and the synchronization rod 240, and has the problem of poor stability.

[0028] It should be noted that the above-mentioned problem that the vehicle-mounted screen has high strength requirements for the roller tube 230 and the synchronization rod 240 is only an example. The embodiments of the present application can be applied to any type of scenario where the vehicle-mounted screen has poor stability.

[0029] Therefore, it is necessary to design a technical solution for a vehicle-mounted screen with high stability.

[0030] Based on this, the embodiment of the present application proposes a vehicle-mounted screen device that can achieve a stable infinite hovering function of the vehicle-mounted screen in a limited vehicle space. Figure 3 、 Figure 4 The vehicle-mounted screen device of the embodiment of the present application is described in detail. Figure 3 、 Figure 4 As shown, the vehicle-mounted screen device 300 of the embodiment of the present application may include a housing 310 , a screen assembly 320 , a screen motor 330 , a first arm 340 , a second arm 350 , a first motor 360 and a second motor 370 .

[0031] The housing 310 is a mounting base for the vehicle-mounted screen device 300. The housing 310 can be mounted on a vehicle body. In some embodiments, the housing 310 can be fixedly installed in the vehicle body in a hidden manner.

[0032] The curtain assembly 320 is fixedly mounted on the housing 310 and typically includes a reel 322 and a curtain 324. The reel 322, also known as a drum, has a fixed end and a movable end. The fixed end of the curtain 324 is fixedly connected to the reel 322, meaning one end of the curtain 324 is fixed to the reel 322, while the other end is the movable end. When the reel 322 winds up the curtain 324, the fixed end is at the innermost coil. The movable end of the curtain 324 is the end away from the housing 310 when the curtain 324 is unrolled.

[0033] The curtain motor 330 is fixed to the housing 310 and is used to rotate the reel 322 of the curtain assembly 320. The curtain motor 330 drives the reel 322 to rotate forward or reverse to wind up and / or unwind the curtain 324. For ease of description, in this embodiment of the present application, the curtain motor 330 rotates forward when winding up the curtain 324.

[0034] The first arm 340 includes a first side rod 341 and a second side rod 342 that are hingedly connected. One end of the first side rod 341 is hingedly disposed on the housing 310 , and one end of the second side rod 342 is hingedly connected to the movable end of the curtain 324 .

[0035] The second arm 350 includes a third side rod 351 and a fourth side rod 352 that are hingedly connected. One end of the third side rod 351 is hingedly disposed on the housing 310 , and one end of the fourth side rod 352 is hingedly connected to the movable end of the curtain 324 .

[0036] The first motor 360 is disposed on the housing 310 and is used to drive the first side rod 341 to drive the first arm 340. The first motor 360 can drive the first side rod 341 to rotate clockwise or counterclockwise, or brake the first side rod 341.

[0037] A second motor 370 is mounted on the housing 310 and is used to drive the third side rod 351, thereby driving the second arm 350. The second motor 370 can rotate the third side rod 351 clockwise or counterclockwise, or brake the third side rod 351. The two separate motors driving the two arms eliminate the need for mechanical synchronization mechanisms used in related art, resulting in a compact design and suitable for vehicle-mounted applications.

[0038] For ease of explanation, in this embodiment, when viewed perpendicular to the back of the curtain assembly 320, the first arm 340 is referred to as the left arm, and the second arm 350 is referred to as the right arm. The first motor 360 is referred to as the left motor, and the second motor 370 is referred to as the right motor. The curtain 324 extends downward when it is extended, and retracts upward when it is retracted.

[0039] The length of the first side bar 341 is the same as the length of the third side bar 351, and the length of the second side bar 342 is the same as the length of the fourth side bar 352. It can be seen that the length of the first arm bar 340 is the same as the length of the second arm bar 350.

[0040] In some implementations, the lengths of the first side rod 341, the second side rod 342, the third side rod 351, and the fourth side rod 352 are all the same. The four side rods are symmetrically and evenly arranged, so that the left and right sides of the curtain 324 are evenly stressed, which helps improve control accuracy and reduce control difficulty.

[0041] The present embodiment does not limit the types of the first motor 360 and the second motor 370 . The first motor 360 and the second motor 370 may be worm motors, helical gear motors, etc. In some embodiments, both the first motor 360 and the second motor 370 are worm motors, which helps reduce space consumption and adapt to vehicle-mounted design environments.

[0042] The specifications of the first motor 360 and the second motor 370 may be the same or different. In some embodiments, the specifications of the first motor 360 and the second motor 370 are the same, which helps to simplify the design and reduce the control difficulty.

[0043] In some implementations, the vehicle-mounted screen device 300 may further include a fixed cover plate 390 and a movable cover plate 392. The fixed cover plate 390 is mounted on the housing to shield the internal components of the housing 310 and enhance the appearance of the housing. Figure 5 As shown, a gap is usually reserved on the fixed cover plate 390 so that the curtain 324 can pass freely.

[0044] The movable cover 392 is connected to the movable end of the curtain 324. Its ends are connected to the first arm 340 and the second arm 350, respectively. That is, the installation direction of the movable cover 392 is perpendicular to the direction in which the curtain 324 is deployed. In other words, one end of the second side bar 342 is hingedly connected to the movable end of the curtain 324 (or one end of the movable cover 392), and one end of the fourth side bar 352 is hingedly connected to the movable end of the curtain 324 (or the other end of the movable cover 392). The movable cover 392 is typically a rigid member, forming a linkage mechanism together with the first arm 340, the second arm 350, and the reel 322. Figure 6 yes Figure 3 The schematic diagram of the hovering position of the vehicle-mounted curtain device shown in FIG. Figure 6 As shown, the movable cover 392 also helps to keep the movable end of the curtain 324 flat. In other embodiments, the movable end of the curtain 324 itself can also be provided with a rigid member.

[0045] It can be seen that Figure 7As shown, the first arm 340 has three revolving joints: a first joint 344 driven by a first motor 360 for driving the first side rod 341; a second joint 345 connecting the first side rod 341 to the second side rod 342; and a third joint 346 connecting the second side rod 342 to the movable cover 392. Since the first joint 344 is driven by the first motor 360, it can also be called an active joint, while the third joint 346 is a passive joint. Similarly, the second arm 350 on the opposite side also has three revolving joints: a first joint 344 driven by a second motor 370 for driving the third side rod 351; a second joint 345 connecting the third side rod 351 to the fourth side rod 352; and a third joint 346 connecting the fourth side rod 352 to the movable cover 392.

[0046] To further improve control accuracy, in some implementations, the vehicle-mounted curtain device 300 may further include a controller 380. The controller 380 is configured to control the operating parameters of the first motor 360 and the second motor 370 so that the rotational speed of the first side rod 341 matches the rotational speed of the third side rod 351, and the rotational direction of the first side rod 341 is opposite to that of the third side rod 351. In other words, the controller 380 ensures that the rotational speeds of the first side rod 341 and the third side rod 351 are consistent, controlling the synchronous motion of the left and right arm rods. This helps improve the synchronization of the motion of the left and right arm rods and enhances the stability of the curtain's infinitely hovering state.

[0047] In the embodiment of the present application, the arms on both sides are driven separately by two motors, which can eliminate the mechanical synchronization mechanism of the arms on both sides in the related art, occupy a small space, and is suitable for vehicle-mounted design. By driving the left and right arms by the left and right motors respectively, the lifting and lowering of the screen and the self-locking hovering function at any height within the use range can be realized. At any position when the screen is unfolded, the upper parts of the left and right arms are fixed by self-locking the motors on both sides, providing a downward pulling force for the screen. The screen motor provides an upward pulling force for the screen, which forms a balance with the force provided by the arms, so that the screen can achieve infinite hovering. The structure of the embodiment of the present application is reliable, avoids the high strength requirements of the mechanical synchronization mechanism, has a strong ability to resist external shocks and vibrations, and in the state of infinite hovering, the screen surface is stable, which facilitates the realization of better projection effects.

[0048] In some possible implementations, an elastic damping member is provided at the hinged joint between the first side rod 341 and the second side rod 342, or in other words, the second joint 345 is an elastic damping joint; and an elastic damping member is provided at the hinged joint between the third side rod 351 and the fourth side rod 352. The elastic damping member can provide a certain opening force to the lower portions of the two side arms (i.e., the second side rod 342 and the fourth side rod 352), causing the passive third joint 346 to follow the movement, thereby providing downward pulling force to the curtain 324 and helping to improve its stability.

[0049] In some implementations, the elastic damping member may be a torsion spring. Alternatively, the second joint 345 may be a torsion spring joint. The torsion spring may provide a certain opening force to the lower portions of the two side arms (i.e., the second side arm 342 and the fourth side arm 352), causing the passive third joint 346 to swing along with the active first joint 344, thereby providing downward pulling force on the curtain 324.

[0050] In some implementations, the controller 380 can control the operating parameters of the curtain motor 330 based on the position of the movable end of the curtain 324. Figure 8 As shown, the width of the curtain 324 remains constant. Typically, the distance between the two active joints (first joint 344) and the distance between the two passive joints (third joint 346) are equal. Assuming that the lengths of the first side rod 341 and the second side rod 342 are both a, and when the angle between the first side rod 341 and the reel 322 is θ, the unfolded length S of the curtain 324 can be expressed as:

[0051] S = 2a × sin (θ).

[0052] The extended length S of the curtain 324 is the position of the movable end of the curtain 324. This position is related to the rotation angle of the first side rod 341. When the first motor 360 driving the first side rod 341 is an active actuator, the controller 380 can control the operating parameters of the curtain motor 330 based on the position of the movable end of the curtain 324 to prevent the curtain from being too tight or too loose.

[0053] In some implementations, the vehicle-mounted screen device 300 may further include a position sensor 382, which is used to detect the position of the movable end of the screen 324. In some embodiments, the position of the movable end of the screen 324 is determined based on the position sensor 382, the Hall sensor of the first motor 360, and the Hall sensor of the second motor 370. The position sensor 382 may be a single sensor or multiple sensors. For example, the position sensor 382 may be a sensor that detects the angle between the first side rod 341 and the reel 322. In other embodiments, the position sensor 382 may be an encoder that detects the number of rotations of the reel 322, and the position of the movable end of the screen 324 is determined by detecting the number of rotations of the reel 322. In other possible embodiments, the position sensor 382 may be a sensor that detects the outer diameter of the reel 322, and the position of the movable end of the screen 324 is determined by detecting the size of the outer diameter of the reel 322.

[0054] In some implementations, the lifting position of the curtain 324 can be determined by converting the position sensor and the Hall sensors of the first motor 360 and / or the second motor 370 at the arms on both sides, and the controller 380 performs fusion control based on multiple sensors.

[0055] In the embodiment of the present application, the arms on both sides are driven separately by two motors, which can eliminate the mechanical synchronization mechanism of the arms on both sides in the related art, occupy a small space, and is suitable for vehicle-mounted design. By driving the left and right arms by the left and right motors respectively, the lifting function of the screen and the self-locking hovering function at any height within the use range can be realized. At any position, the upper parts of the left and right arms are fixed by making the motors on both sides self-lock; the torsion spring joint provides a certain opening force for the lower part of the arm, and the passive joint is driven to provide a downward pulling force for the screen. The screen motor can provide an upward pulling force for the screen, forming a balance with the force provided by the arms on both sides, so that the screen can achieve infinite hovering. Through the above coordination, the use of an under-driven connecting rod mechanism can achieve infinite hovering while having a certain adaptability to drive synchronization. The structure of the embodiment of the present application is stable and reliable, and has a strong ability to resist external impact and vibration. In the state of infinite hovering, the screen surface is stable, which is convenient for achieving better projection effects.

[0056] The curtain assembly 320 typically has multiple operating states, including a closed state, an extended state, a hovering state, and a retracted state. These multiple operating states correspond to multiple current ranges for the first motor 360, and these multiple operating states correspond to multiple current ranges for the second motor 370. This helps improve the motor stress during the different lifting and lowering phases, preventing excessive load from causing motor stalling or excessive load from causing the curtain surface to sag. This improved motor stress also reduces the overall noise level of the curtain assembly.

[0057] The following describes in detail the multiple working states of the curtain assembly 320 by taking the first motor 360 and the second motor 370 as worm motors and the second joints 345 on both sides as torsion spring joints as an example.

[0058] (1) Closed state. Figure 9 As shown, when the curtain is closed, the arms on both sides are closed, and the curtain 324 is fully retracted. The first motor 360 and the second motor 370 are internally mechanically self-locked, which can be achieved by locking the internal brakes, and are in a fixed state. The curtain's degree of freedom f = 3 × 3 - 2 × 4 = 1, meaning f is 1, and the curtain is underactuated. The torsion spring joints provide a certain opening force to the lower portions of the arms on both sides, and the passive joints at the lower ends follow the force, applying downward tension to the curtain. The tension provided by the curtain creates a large symmetrical internal stress in the system, allowing the curtain to reach a stable state.

[0059] (2) Hover state. Figure 10aAs shown, in the hovering state, when the curtain 324 is deployed to any position, the first motor 360 and the second motor 370 are internally locked, and the curtain motor 330 reverses a certain distance to pull the curtain 324 back. The curtain 324 is tensioned, and the degree of freedom f of the curtain is 1, indicating that the curtain is in an underactuated state. The tension provided by the curtain creates a large symmetrical internal stress in the system, allowing the curtain to reach a stable state. Figure 10a The middle joints (i.e., the second joints 345) of the two side arm rods are biased toward the inner side of the curtain 324. Figure 10b The middle joints of the two side arm rods (i.e., the second joints 345) are biased toward the outside of the curtain 324.

[0060] It can be seen that the closed state and the hovering state of the curtain are static states; while the retracted state and the expanded state are dynamic processes.

[0061] (3) Expanded state.

[0062] The expanded state is also called the open state. Figure 11 As shown, in the extended state, the curtain motor rotates forward and releases the curtain 324, while the first motor 360 and the second motor 370 drive the left and right arms to open. It will be appreciated that the first motor 360 and the second motor 370 rotate in opposite directions. The curtain has three degrees of freedom, and is in an underactuated state. The extra degree of freedom compensates for variations caused by synchronization differences between the two motors and manufacturing and assembly tolerances, preventing structural jamming. It also controls the tension of the curtain motor 330 to achieve a balanced linkage.

[0063] (4) Retracted state.

[0064] The retracted state is also called the recovered state. Figure 12 As shown, in the retracted state, the curtain motor 330 reverses and retracts the curtain. The first and second motors 360 and 370 drive the retracted arms, rotating in opposite directions. The curtain system has three degrees of freedom, and the curtain is underactuated. The extra degree of freedom compensates for variations caused by synchronization differences between the two motors and manufacturing and assembly tolerances, preventing structural jamming. It also controls the tension of the curtain motor 330 to achieve a balanced linkage.

[0065] The controller 380 controls the rotational speed of the first sidebar 341 to match the rotational speed of the third sidebar 351, thereby controlling the synchronous motion of the left and right arm bars. To further improve control accuracy, in some implementations, the controller 380 is configured to match the Hall effect counter of the first motor 360 with the Hall effect counter of the second motor 370. By matching the Hall effect counter of the first motor 360 with the Hall effect counter of the second motor 370, the rotational speed of the first sidebar 341 can be matched with the rotational speed of the third sidebar 351.

[0066] In some implementations, the specifications of the first motor 360 are the same as those of the second motor 370, and the controller 380 is used to control the difference between the Hall count of the first motor 360 and the Hall count of the second motor 370 to be less than a preset threshold. The preset threshold can be, for example, 10 or 15. For ease of explanation, the first motor 360 and the second motor 370 can be set as the active motor and the driven motor, respectively, or the first motor 360 and the second motor 370 can be set as the driven motor and the active motor, respectively. This embodiment of the application is not limited to this. When the difference between the Hall count of the first motor 360 and the Hall count of the second motor 370 is less than the preset threshold, it can be considered that the operating speeds of the first motor 360 and the second motor 370 match, thereby achieving synchronous control.

[0067] The following combination Figure 13 , the control logic of the controller 380 of the embodiment of the present application for controlling the synchronous lifting of the left and right arms is explained.

[0068] The unfolded state and the retracted state of the curtain 324 are both in motion. The controller 380 can divide the first motor 360 and the second motor 370 into an active motor and a slave motor according to the control logic of the synchronous drive. Take the first motor 360 on the left as the active motor M2 and the second motor 370 on the right as the slave motor M0 as an example. For example and not limitation, it is assumed that the total stroke Hall count value of the first motor 360 and the second motor 370 is 3334, the total stroke time is 25 seconds, the pulse width modulation (PWM) frequency of the motor is 20kHz, the synchronous detection cycle time is 100ms, and the preset threshold of the Hall count is 15. The forward (down) duty cycle of the motors on both sides is 50%, and the reverse (up) duty cycle is 30%. The maximum duty cycle of M0 speed regulation (duty_max) is set to M2_duty±5%.

[0069] With both motors driven together, controller 380 determines the synchronization of their operation based on the Hall effect counters. It then adjusts the speed of the slave motor (second motor 370) to match the speed of the master motor, thereby achieving synchronous control. The process by which controller 380 controls the synchronous raising and lowering of the left and right arms primarily includes steps S1310 to S1390, which are described in detail below.

[0070] Step S1310, start.

[0071] In step S1320 , the Hall count (M0_HALL) of the slave motor M0 is collected.

[0072] In step S1330 , the Hall count (M2_HALL) of the active motor M2 is collected.

[0073] In step S1340 , the Hall count difference HALL_miss=M0_HALL−M2_HALL between M0 and M2 is calculated.

[0074] In step S1350, it is determined whether the absolute value of the Hall effect count difference is greater than or equal to a preset threshold (e.g., 15). If the Hall effect count difference is less than the preset threshold, it is considered that the speeds of the slave motor and the master motor match and can be used for synchronous control, and the adjustment ends. If it is greater than or equal to the preset threshold, the process proceeds to step S1360 for further adjustment.

[0075] In step S1360 , the new duty cycle (M0_new_duty) of M0 is adjusted, and it is determined whether the difference between the adjusted new duty cycle (M0_new_duty) of M0 and the duty cycle (M2_duty) of M2 is less than ±5% of M2_duty.

[0076] If the difference between the adjusted new duty cycle of M0 (M0_new_duty) and the duty cycle of M2 (M2_duty) is less than ±5% of M2_duty, proceed to step S1380; if the difference between the two is greater than or equal to ±5% of M2_duty, proceed to step S1370.

[0077] In step S1370, the new duty cycle of M0 (M0_new_duty) is set to the maximum duty cycle, that is, to ±5% of M2_duty. At the same time, an error in the slave motor M0 is reported to the system.

[0078] In step S1380, the new duty cycle (M0_new_duty) after adjustment of M0 is assigned to the duty cycle parameter M0_duty of the M0 motor, and it is considered that the operating speeds of the driven motor and the active motor match.

[0079] Step S1390, end.

[0080] Due to software limitations in controller 380, the left and right arm motors are considered synchronized when the difference in Hall effect counts falls below a preset threshold (e.g., 15). However, this slight error, when reflected in the mechanical structure, creates a slight asymmetry between the left and right arm motors. This slight difference can be compensated by the system's underactuated state.

[0081] The control logic of the controller 380 for controlling the lifting speed and position of the vehicle-mounted screen is described below.

[0082] The overall raising and lowering speed of the curtain 324 is achieved by controlling the speed changes of three motors: the first motor 360, the second motor 370, and the curtain motor 330. The drive control logic of the controller 380 is as follows: the first motor 360 has multiple current ranges corresponding to the curtain's various operating states. For example, the curtain's extended state corresponds to the first motor 360's first current range, while the curtain's retracted state corresponds to the first motor 360's second current range. The first current range is different from the second current range. The second motor 370 has multiple current ranges corresponding to the curtain's various operating states. It is understandable that since the first and second motors 360, 370 are symmetrically distributed about the curtain's centerline, the current ranges corresponding to the first and second motors 360, 370 should be the same for the same curtain operating state, indicating even force on both sides. Furthermore, the curtain motor 330 has multiple current ranges corresponding to the curtain's various operating states.

[0083] By collecting the current of the three motors and limiting each motor's operation to a corresponding current range, the stress conditions on the motors during the different deployment phases (deployed state) and retraction phases (retracted state) can be improved. This prevents excessive loads from causing motor stalling, or excessive loads from causing the screen to sag. Improving the stress conditions on the motors also helps reduce the overall noise of the screen assembly 320.

[0084] In the embodiment of the present application, the arms on both sides are driven separately by two motors, which can eliminate the mechanical synchronization mechanism of the arms on both sides in the related art, occupy a small space, and is suitable for vehicle-mounted design. By driving the left and right arms by the left and right motors respectively, the lifting function of the screen and the self-locking hovering function at any height within the use range can be realized. At any position, by making the motors on both sides self-lock internally, the upper parts of the left and right arms are fixed; the torsion spring joint provides a certain opening force for the lower part of the arm, and the passive joint is driven to provide a downward pulling force for the screen. The screen motor can provide an upward pulling force for the screen, forming a balance with the force provided by the arms on both sides, so that the screen can achieve stepless hovering. Through the above coordination, the use of an under-driven connecting rod mechanism can achieve stepless hovering while having a certain adaptability to drive synchronization. The structure of the embodiment of the present application is stable and reliable, avoiding the high strength requirements of the mechanical synchronization mechanism, and has a strong ability to resist external impact and vibration. In the state of stepless hovering, the screen surface is stable, which facilitates the realization of better projection effects.

[0085] The embodiment of the present application also provides a vehicle, Figure 14 Schematic diagram of the component units / partial component units of the vehicle provided in the embodiment of the present application. Figure 14 As shown, the vehicle 1400 may include: a vehicle-mounted screen device 300 as described in any of the above.

[0086] Those skilled in the art will understand that Figure 14The vehicle 1400 is merely an example and does not limit the vehicle, and may include more or fewer components than shown, or may combine certain components or different components.

[0087] It should be understood that the vehicles in the embodiments of the present application can be wheeled vehicles or work equipment used on land. The vehicles can be motor vehicles, which can be road-based vehicles for passenger transportation, motor vehicles used to transport goods, or vehicles used for specialized engineering operations. The vehicles can be buses and trucks. Buses can be private cars, buses, or commercial vehicles. Buses can also be soft-seat cars, hard-sleeper cars, soft-sleeper cars, dining cars, luggage cars, postal cars, etc. Trucks can be flatbed cars, open cars, covered cars, tank cars, insulated cars, etc. Vehicles can also be specialized vehicles, such as cash transporters, vans, or on-board shelters. Vans or on-board shelters are used for specialized equipment required for field operations and combat, such as geological exploration, water conservancy projects, construction projects, military field operations, and communications. The vehicles in the embodiments of the present application can be powered by traditional energy sources, such as gasoline, diesel, or natural gas, or they can be powered by new energy sources, such as electric vehicles or hydrogen vehicles. The embodiments of the present application do not specifically limit the type of vehicle.

[0088] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0089] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0090] In the embodiments provided in this application, it should be understood that the disclosed devices / equipment and methods can be implemented in other ways. For example, the device / equipment embodiments described above are only schematic. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0091] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0092] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0093] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0094] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A vehicle-mounted screen device, characterized in that: include: case; A curtain assembly is fixedly mounted on the housing, the curtain assembly comprising a reel and a curtain, one end of the curtain is fixedly mounted on the reel, and the other end of the curtain is a movable end; A curtain motor, fixedly mounted on the housing, for driving the reel of the curtain assembly; a first arm having a first side rod and a second side rod hingedly connected, wherein one end of the first side rod is hingedly disposed on the housing, and one end of the second side rod is hingedly connected to the movable end of the curtain; The second arm has a third side rod and a fourth side rod that are hingedly connected, one end of the third side rod is hingedly provided on the housing, and one end of the fourth side rod is hingedly connected to the movable end of the curtain; a first motor, configured to drive the first side rod; a second motor, configured to drive the third side rod; The length of the first side rod is the same as the length of the third side rod, and the length of the second side rod is the same as the length of the fourth side rod.

2. The vehicle-mounted screen device according to claim 1, characterized in that: Also includes: A controller is used to control operating parameters of the first motor and operating parameters of the second motor so that the rotation speed of the first side rod matches the rotation speed of the third side rod and the rotation direction of the first side rod is opposite to the rotation direction of the third side rod.

3. The vehicle-mounted screen device according to claim 2, characterized in that: The controller is used to control the Hall count of the first motor to match the Hall count of the second motor, so that the rotation speed of the first side rod matches the rotation speed of the third side rod.

4. The vehicle-mounted screen device according to claim 3, characterized in that: The specifications of the first motor are the same as those of the second motor, and the controller is used to control the difference between the Hall count of the first motor and the Hall count of the second motor to be smaller than a preset threshold.

5. The vehicle-mounted screen device according to claim 2, characterized in that: The controller is further configured to control operating parameters of the curtain motor according to the position of the movable end of the curtain.

6. The vehicle-mounted screen device according to claim 5, characterized in that: The vehicle-mounted screen device further includes a position sensor, and the position of the movable end of the screen is determined based on the position sensor, the Hall sensor of the first motor, and the Hall sensor of the second motor.

7. The vehicle-mounted screen device according to claim 2, characterized in that: The curtain assembly has multiple working states, including: closed state, unfolded state, hovering state, and retracted state. The multiple working states correspond to multiple current intervals of the first motor, and the multiple working states correspond to multiple current intervals of the second motor.

8. The vehicle-mounted screen device according to claim 7, characterized in that: When the curtain assembly is in the closed state or the hovering state, the first motor and the second motor are both in a braking state.

9. The vehicle-mounted screen device according to any one of claims 1 to 8, characterized in that: An elastic damping member is provided at a hinged joint between the first side rod and the second side rod, and an elastic damping member is provided at a hinged joint between the third side rod and the fourth side rod.

10. A vehicle, characterized in that: It comprises the vehicle-mounted screen device according to any one of claims 1 to 9.

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