Self-adaptive curve lighting system based on LED array

Abstract

The utility model relates to curve lighting, in particular to a self-adaptive curve lighting system based on an LED (light-emitting diode) array, which comprises a vehicle body module, an LED driving module and a vehicle lamp module which are sequentially connected, and the vehicle body module comprises a BCM (body control module), a steering wheel steering sensor and a vehicle speed sensor. The BCM module receives steering wheel turning angle and steering speed data provided by the steering wheel steering sensor, and the vehicle speed sensor monitors the running speed of a vehicle and transmits the data to the BCM module; the LED driving module comprises a system basic chip, an MCU and a first UART-CAN transceiver, and the system basic chip is integrated with the CAN transceiver so as to realize CAN communication between the LED driving module and the BCM module; the vehicle lamp module comprises a second UART-CAN transceiver, a matrix chip and an LED array; smooth adjustment of the light pattern during turning is achieved, and real-time light pattern adjustment can be continuously carried out.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of intelligent transportation, and relates to bend lighting, especially a self-adaptive bend lighting system based on LED array. BACKGROUND

[0002] Bend lighting system is a kind of automobile lighting technology for improving night driving safety, aiming at solving the problem of lighting blind area in the inner side of bend when vehicle turns. According to different implementation modes, bend lighting system is mainly divided into two types of static auxiliary lighting and dynamic auxiliary lighting.

[0003] Static auxiliary lighting system illuminates the inner side of bend by adding additional light sources (such as corner light) in front of vehicle. When steering wheel turns to a certain angle, these additional light sources will automatically turn on to provide low beam lighting. This system is simple to implement and low in cost, but the angle covered by bend lighting realized by additional light sources is a fixed value, and the effect is unstable in actual working conditions, and the experience is poor.

[0004] Dynamic auxiliary lighting system increases rotary motor, and BCM (body control module) transmits the received vehicle speed, body turning angle and steering speed signals to LED drive module through CAN signal, and LDM judges the angle that rotary motor needs to rotate according to the received conditions to realize bend lighting effect. But the adjustment of rotary motor needs a certain acceleration and deceleration time, and there is a window time for motor adjustment. After continuous adjustment for a period of time, it needs to stop for a period of time before continuing to adjust. In the extreme working condition, it may not be able to adjust the light module to the corresponding position in real time according to the steering angle, which has safety hazards. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to solve the problem of unstable effect of additional light source or window time of motor adjustment, and provide a self-adaptive bend lighting system based on LED array. The vehicle turning signal is analyzed in real time by LED drive module, and the switching and brightness of each LED in LED array are accurately controlled, so that smooth adjustment of light type is realized when turning, and real-time light type adjustment can be continuously carried out.

[0006] The technical scheme adopted by the utility model to solve its technical problem is: a self-adaptive bend lighting system based on LED array, comprising a body module, an LED drive module and a vehicle lamp module connected in sequence,

[0007] The body module comprises a BCM module, a steering wheel turning sensor and a vehicle speed sensor, the BCM module receives the steering angle and steering speed data provided by the steering wheel turning sensor, and the vehicle speed sensor monitors the driving speed of the vehicle and transmits the data to the BCM module.

[0008] The LED driving module comprises a system base chip, an MCU and a first UART-CAN transceiver, the system base chip is integrated with a CAN transceiver to realize CAN communication between the LED driving module and the BCM module.

[0009] The vehicle lamp module comprises a second UART-CAN transceiver, a matrix chip and an LED array, the second UART-CAN transceiver realizes communication between the MCU and the matrix chip using a UART communication protocol, and the matrix chip controls the switching and brightness of each LED in the LED array.

[0010] The BCM module receives relevant data monitored by a steering wheel steering sensor and a vehicle speed sensor, and transmits the data to the LED driving module through CAN communication, the LED driving module calculates the time required for the vehicle to turn, and adjusts the brightness of each LED in the LED array according to the offset calculated based on the illumination angle covered by each LED, to realize smooth adjustment of the light pattern during turning.

[0011] Further, the system base chip is further integrated with a watchdog and a low dropout linear regulator, the watchdog monitors the running state of the MCU, and the low dropout linear regulator provides 5V voltage for the MCU and the first UART-CAN transceiver.

[0012] The watchdog monitors the running state of the MCU to prevent the system from stalling or being abnormal due to software failure or hardware interference. The low dropout linear regulator provides 5V voltage for the MCU and the first UART-CAN transceiver to ensure efficient operation and reliability of the entire system.

[0013] Further, the LED driving module further comprises an electrostatic discharge protection module, a DC / DC conversion module and a linear regulator, the electrostatic discharge protection module is connected with a power input end and provides stable input power for the system base chip, the DC / DC conversion module and the linear regulator. Such arrangement can significantly improve the reliability, stability and safety of the system, and optimize power management.

[0014] Further, the DC / DC conversion module outputs a constant current to drive the LED array. Such arrangement can significantly improve the brightness consistency, color temperature stability and service life of each LED, and optimize system efficiency and reliability.

[0015] Further, the linear regulator provides 5V voltage for the second UART-CAN transceiver. Such arrangement provides stable voltage for the second UART-CAN transceiver to ensure reliable operation of the entire system.

[0016] Further, the LED array is provided with three rows, the first row is provided with a plurality of high beam LEDs, the second row is provided with a plurality of high beam and low beam shared LEDs in the middle, a plurality of high beam LEDs are arranged on one side of the plurality of high beam and low beam shared LEDs, a plurality of low beam LEDs and a plurality of high beam LEDs are sequentially arranged on the other side of the plurality of high beam and low beam shared LEDs, and the third row is provided with a plurality of low beam LEDs in the middle, and a plurality of high beam LEDs are arranged on both sides of the plurality of low beam LEDs.

[0017] Reasonable distribution of high beam LEDs, low beam LEDs and high beam and low beam shared LEDs can significantly improve the flexibility, adaptability and safety of the lighting system, support complex intelligent lighting functions, and optimize lighting efficiency and uniformity.

[0018] Further, the number of LEDs in the first row is equal to the number of LEDs in the second row, and the number of LEDs in the third row is less than the number of LEDs in the second row, and the number of high beam LEDs on both sides of the plurality of low beam LEDs in the third row is the same.

[0019] The number of LEDs in the first row and the second row is equal, and contains high beam and high beam and low beam shared LEDs, which can ensure sufficient brightness and coverage in high beam mode, and also maintain good lighting uniformity in low beam mode. The third row is mainly composed of low beam LEDs, and the number of high beam LEDs on both sides is small but symmetrically distributed. This design can concentrate the brightness of low beam LEDs to ensure clearer road lighting in urban roads or when meeting, while reducing the glare to oncoming drivers.

[0020] Further, the number of high beam LEDs in the first row is 16, the number of high beam and low beam shared LEDs is 4, the number of low beam LEDs in the second row is 4, and the number of low beam LEDs in the third row is 8.

[0021] The first row has 16 high beam LEDs, which can provide very high brightness and long-distance lighting, which is very critical for night high-speed driving or unlit roads, ensuring that the driver has sufficient vision. The 4 high beam and low beam shared LEDs in the first row can be flexibly switched between high beam and low beam modes, providing additional lighting flexibility while reducing the risk of glare to oncoming drivers. The low beam LEDs (12 in total) in the second row and the third row are concentrated in the middle and below, which can provide more uniform low beam lighting, suitable for urban roads and meeting scenarios.

[0022] Further, the system base chip adopts UJA1169, and the MCU adopts S32K312.

[0023] Further, the matrix chip adopts TPS92662A.

[0024] The beneficial effects of the utility model are as follows:

[0025] (1) Based on high-pixel LED array, each LED can be independently controlled, realizing pixel-level light type adjustment, greatly improving the smoothness of light type transition, and effectively eliminating the jumping feeling at the junction of light and dark;

[0026] (2) Through the precise current control of the LED driving module, the brightness and light type of each LED can be dynamically adjusted according to real-time road conditions;

[0027] (3) The LED driving module supports rapid response, which can instantly adjust the light type when the vehicle turns, ensuring the best lighting effect in complex road conditions;

[0028] (4) Support the simultaneous opening of high beam, low beam and curve lighting function, realize the maximum utilization of resources through LED array, save hardware cost;

[0029] (5) Through high-pixel LED array and LDM module, low-delay dynamic dimming and pixel-level precise control are realized, which significantly improves the flexibility, safety and efficiency of the vehicle lighting system. BRIEF DESCRIPTION OF DRAWINGS

[0030] The utility model will be further explained in connection with the drawings and examples.

[0031] Figure 1 It is the structure diagram of the utility model.

[0032] Figure 2 It is the distribution diagram of LED array in the utility model.

[0033] Figure 3 It is the brightness distribution when the LED array in the utility model only has low beam lighting and no offset.

[0034] Figure 4 It is the brightness distribution when the LED array in the utility model only has low beam lighting and right offset.

[0035] Figure 5 It is the brightness distribution when the LED array in the utility model has low beam and high beam lighting and no offset.

[0036] Figure 6 It is the brightness distribution when the LED array in the utility model has low beam and high beam lighting and right offset.

[0037] In the figure: 1, vehicle body module; 11, BCM module; 12, steering wheel steering sensor; 13, vehicle speed sensor; 2, LED driving module; 21, system base chip; 22, MCU; 23, first UART-CAN transceiver; 24, electrostatic discharge protection module; 25, DC / DC conversion module; 26, linear voltage regulator; 3, vehicle lamp module; 31, second UART-CAN transceiver; 32, matrix chip; 33, LED array; 331, high beam LED; 332, low beam LED; 333, high and low beam shared LED. DETAILED DESCRIPTION

[0038] The utility model will be explained in further detail now in combination with the drawings. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the utility model in a schematic manner, so they only show the components related to the utility model.

[0039] As Figure 1 shown, the adaptive curve lighting system based on LED array includes vehicle body module 1, LED driving module 2 and vehicle lamp module 3 connected in turn, and the three modules are described in detail below.

[0040] Vehicle body module 1 includes BCM module 11 (vehicle body control module), steering wheel steering sensor (SAS) 12 and vehicle speed sensor (VSS) 13, BCM module 11 receives steering wheel steering angle and steering speed data provided by steering wheel steering sensor 12, and vehicle speed sensor 13 monitors the driving speed of the vehicle and transmits the data to BCM module 11.

[0041] LED driving module 2 includes system base chip (SBC) 21, MCU (micro control unit) 22, first UART-CAN transceiver 23, electrostatic discharge protection module (ESD Protection) 24, DC / DC conversion module 25 and linear voltage regulator (LDO) 26, system base chip 21 is integrated with CAN transceiver, watchdog and low-dropout linear voltage regulator, CAN communication between LED driving module 2 and BCM module 11 is realized through CAN transceiver, watchdog monitors the running state of MCU 22, and low-dropout linear voltage regulator provides 5V voltage for MCU 22 and first UART-CAN transceiver 23. Electrostatic discharge protection module 24 is connected with the power input end, and respectively provides stable input power for system base chip 21, DC / DC conversion module 25 and linear voltage regulator 26.

[0042] The vehicle lighting module 3 includes a second UART-CAN transceiver 31, a matrix chip (LMM) 32, and an LED array 33. The second UART-CAN transceiver 31 communicates with the first UART-CAN transceiver 23 using the UART communication protocol to enable communication between the MCU 22 and the matrix chip 32. The matrix chip 32 controls the switching and brightness of each LED in the LED array 33. The DC / DC conversion module 25 outputs a constant current to drive the LED array 33, and the linear regulator 26 provides a 5V voltage to the second UART-CAN transceiver 31.

[0043] The system's foundation chip 21 uses the UJA1169 to build an efficient CAN bus communication system, supporting high-speed data transmission and low-power operation. The MCU 22 uses the S32K312, supporting high-performance real-time control and functional safety requirements. The matrix chip uses the TPS92662A, suitable for high-brightness and precise control automotive lighting systems. In actual use, other chip models can be used depending on the requirements. The UART-CAN transceiver is essentially a CAN transceiver, but it uses the UART communication protocol.

[0044] like Figure 2 As shown, the LED array 33 in this embodiment has three rows. The first row has 16 high-beam LEDs 331. The second row has 4 LEDs 333 that share both high and low beams in the middle. Six high-beam LEDs 331 are arranged on one side of the four shared high-beam LEDs 333, and four low-beam LEDs 332 and two high-beam LEDs 331 are arranged sequentially on the other side of the four shared high-beam LEDs 333. The third row has 8 low-beam LEDs 332 in the middle, and two high-beam LEDs 331 are arranged on both sides of the eight low-beam LEDs 332. That is, the first row has the same number of LEDs as the second row, 16 in total, and the third row has 12 LEDs.

[0045] The signals required for adaptive cornering lighting include low beam light-on command, high beam light-on command, adaptive light enable command, steering wheel angle signal, steering wheel angular velocity signal, and vehicle speed signal. When the BCM module 11 receives a signal indicating insufficient ambient light intensity or night driving, it issues a low beam light-on command; when driving at night and there is no oncoming vehicle in front, the BCM module 11 issues a high beam light-on command based on sensor signals or manual operation by the driver. When the BCM module 11 detects the need for adaptive lighting functions (such as cornering lighting, automatic switching for passing), it issues an adaptive light enable command. The steering wheel turning sensor 12 outputs corresponding electrical signals by detecting the turning angle and speed of the steering wheel. These signals are transmitted to the BCM module 11 after signal processing circuit. The vehicle speed sensor 13 detects the driving speed of the vehicle, and the vehicle speed signal is transmitted to the BCM module 11 after signal processing circuit, and then transmitted to the LED driving module 2 through CAN communication by the BCM module 11.

[0046] The opening condition of adaptive cornering lighting is: low beam is on, adaptive light is enabled, the absolute value of steering wheel angle is greater than 15° (hysteresis interval 1°, i.e. greater than 15° when entering, less than 14° when exiting), vehicle speed is greater than 30km / h (hysteresis interval 2km / h, i.e. greater than 30km / h when entering, less than 28km / h when exiting), the above angle, speed and hysteresis interval are reference values, and actual data can be calibrated and adjusted according to specific vehicle models. If any of the above opening conditions is not met, or if an open circuit or short circuit is detected in the LED array 33, the adaptive light mode is exited, and the corresponding light pattern is lit according to the value of the high-low beam light-on command.

[0047] When the cornering lighting opening condition is met, the LED driving module 2 converts the steering wheel angle into the actual rotation angle of the hub, predicts the corner curvature radius and the time required for turning according to the steering speed and vehicle speed, then calculates the lighting expansion angle according to the curvature radius, calculates the number of pixels that need to be offset according to the lighting angle covered by each LED pixel, and finally adjusts the brightness of the LED array 33 according to the time required for turning and the pixel offset.

[0048] As shown in Figure 3 , the LED array 33 only has low beam lighting and no pixel (LED) offset, and the brightness values of the 4 high-low beam shared LEDs 333 from left to right are 0, 20, 50 and 100, respectively, the brightness values of the 4 low beam LEDs 332 in the second row from left to right are 50, 20, 0 and 0, respectively, and the brightness values of the 8 low beam LEDs 332 in the third row from left to right are 20, 20, 50, 100, 100, 50, 20 and 20, respectively.

[0049] As shown in Figure 4 , compared to Figure 3, the LED array 33 is offset to the right by 2 pixels, the 4 far-and-near light shared LEDs 333 have a brightness value of 0, 0, 0 and 20 from left to right, the 4 low beam LEDs 332 in the second row have a brightness value of 50, 100, 50 and 20 from left to right, and the 8 low beam LEDs 332 in the third row have a brightness value of 20, 20, 20, 20, 50, 100, 100 and 50 from left to right. As can be seen, the pixel offset is only implemented in the low beam pixel range, and the brightness value beyond the low beam pixel boundary is clipped and is not affected.

[0050] As shown in Figure 5 , the high beam and low beam are lit at the same time and there is no pixel offset, if the high beam LEDs 331 are lit, the far-and-near light shared LEDs 333 are preferentially lit according to the brightness of the high beam LEDs 331, the brightness value of all the high beam LEDs 331 is 100, the brightness value of the 4 far-and-near light shared LEDs 333 is 50, the brightness value of the 4 low beam LEDs 332 in the second row from left to right is 50, 20, 0 and 0, and the brightness value of the 8 low beam LEDs 332 in the third row from left to right is 20, 20, 50, 100, 100, 50, 20 and 20.

[0051] As shown in Figure 6 , compared with Figure 5 , the LED array 33 is offset to the right by 2 pixels, the brightness value of the 4 far-and-near light shared LEDs 333 is still 50, the brightness value of the 4 low beam LEDs 332 in the second row from left to right is 50, 100, 50 and 20, and the brightness value of the 8 low beam LEDs 332 in the third row from left to right is 20, 20, 20, 20, 50, 100, 100 and 50. After the high beam and low beam are lit at the same time, although the far-and-near light shared LEDs 333 are filled according to the high beam intensity, they are still filled according to the original low beam light pattern when offset. In the right offset by 2 pixels, the low beam LEDs 332 part and Figure 4 , only the low beam is lit, it is equivalent to filling the far-and-near light shared LEDs 333 according to the high beam light pattern on the basis of the low beam offset light pattern. As can be seen, after the high beam and low beam are lit at the same time, if the high beam is turned off, the far-and-near light shared LEDs 333 are filled according to the low beam light pattern when the low beam is lit alone. After the low beam is lit alone, if the high beam is lit again, the far-and-near light shared LEDs 333 are lit according to the high beam light pattern.

[0052] Therefore, based on the pixel accurate control of the LED array 33, the smoothness of the light pattern transition is greatly improved, the jumping feeling at the bright-dark boundary is effectively eliminated, the maximum utilization of resources is ensured, and the hardware cost is saved.

[0053] With the above ideal embodiment of the present application as the inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. An adaptive curve lighting system based on LED array, comprising a vehicle body module, an LED driving module and a vehicle lamp module connected in sequence, characterized in that: the vehicle body module comprises a BCM module, a steering wheel steering sensor and a vehicle speed sensor, the BCM module receives the steering wheel steering angle and steering speed data provided by the steering wheel steering sensor, and the vehicle speed sensor monitors the driving speed of the vehicle and transmits the data to the BCM module; the LED driving module comprises a system base chip, an MCU and a first UART-CAN transceiver, the system base chip is integrated with a CAN transceiver to realize CAN communication between the LED driving module and the BCM module; the vehicle lamp module comprises a second UART-CAN transceiver, a matrix chip and an LED array, the second UART-CAN transceiver realizes communication between the MCU and the matrix chip using a UART communication protocol with the first UART-CAN transceiver, and the matrix chip controls the switching and brightness of each LED in the LED array. The system base chip is also integrated with a watchdog and a low dropout linear regulator, the watchdog monitors the running state of the MCU, and the low dropout linear regulator provides 5V voltage for the MCU and the first UART-CAN transceiver. The LED driving module further comprises an electrostatic discharge protection module, a DC / DC conversion module and a linear regulator, the electrostatic discharge protection module is connected with a power input end and provides stable input power for the system base chip, the DC / DC conversion module and the linear regulator. The DC / DC conversion module outputs a constant current to drive the LED array.

2. The LED array based adaptive bendway lighting system of claim 1, wherein: The linear regulator provides 5V voltage for the second UART-CAN transceiver.

3. The LED array based adaptive bendway lighting system of claim 1, wherein: The LED array is provided with three rows, a plurality of high beam LEDs are arranged in the first row, a plurality of high-low beam shared LEDs are arranged in the middle of the second row, a plurality of high beam LEDs are arranged on one side of the plurality of high-low beam shared LEDs, a plurality of low beam LEDs and a plurality of high beam LEDs are arranged in sequence on the other side of the plurality of high-low beam shared LEDs, and a plurality of low beam LEDs are arranged in the middle of the third row, and a plurality of high beam LEDs are arranged on both sides of the plurality of low beam LEDs.

4. The LED array based adaptive bendway lighting system of claim 3, wherein: The number of LEDs in the first row is equal to the number of LEDs in the second row, and the number of LEDs in the third row is less than the number of LEDs in the second row, and the number of high beam LEDs on both sides of the plurality of low beam LEDs in the third row is the same.

5. The LED array based adaptive bendway lighting system of claim 3, wherein: The number of high beam LEDs in the first row is 16, the number of high-low beam shared LEDs is 4, the number of low beam LEDs in the second row is 4, and the number of low beam LEDs in the third row is 8.

6. The LED array based adaptive bendway lighting system of claim 1, wherein: The system base chip adopts UJA1169, and the MCU adopts S32K312.

7. The LED array based adaptive bendway lighting system of claim 6, wherein: The matrix chip adopts TPS92662A.

8. The LED array based adaptive bendway lighting system of claim 7, wherein: ​ 9. The LED array based adaptive bendway lighting system of claim 1, wherein: ​ 10. The LED array based adaptive bendway lighting system of claim 1, wherein: ​

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