A pixel-based adaptive automobile headlight control system based on DLP

Abstract

The present invention belongs to the technical field of automobile lamp control, and specifically relates to a pixel-type adaptive automobile headlamp control system based on DLP, comprising: an image processor for collecting external images; an MCU chip, receiving CAN messages sent by the image processor, and parsing and calculating the CAN messages; a DLP control chip, receiving control information calculated by the MCU chip; a DMD chip, receiving control information of the DLP control chip, and changing the angle of the tiny reflector of its internal micromirror matrix according to the control information; an LED light source component; an LED driver chip, receiving a PWM signal sent by the MCU chip and driving the LED light source component to turn on or off and the brightness; the LED light source component emits a uniform light beam to the internal micromirror matrix of the DMD chip, and the light beam is reflected by the internal micromirror matrix of the DMD chip and then emitted through an external lens. The present invention has high control accuracy, rapid and sensitive response and good compatibility.

Description

Technical Field

[0001] The invention relates to the technical field of automobile lamp control, in particular to a pixel-type adaptive automobile headlamp control system based on DLP. Background Art

[0002] With the continuous improvement of people's living standards, cars have become the daily means of transportation for thousands of families. However, with the continuous increase in the use of cars, the incidence of traffic accidents is also rising year by year. According to the data analysis of the Ministry of Transport in recent years, the probability of traffic accidents in China at night is 1.5 times that of daytime, and 60% of major traffic fatalities occur at night, of which 30%-40% of nighttime traffic accidents are caused by the abuse of high beams and poor lighting. Therefore, in recent years, many car lighting manufacturers and research institutions at home and abroad have begun to devote themselves to the research of active safety technology for automobiles. Among them, in the field of car lights, it mainly involves car headlights with AFS (Adaptive Front-lighting System, AFS) or ADB (Adaptive Driving Beam) functions.

[0003] Traditional mechanical adaptive headlights have low adjustment accuracy and wear during the adjustment process. Due to the limited number of main LED light sources in the LED light source matrix, matrix headlights have low control accuracy for light angles and dark areas and low resolution.

[0004] The pixel-based adaptive front lighting based on DLP is an integration and upgrade of the AFS and ADB functions, which is mainly achieved by relying on DLP technology. DLP (Digital Light Processing) is a revolutionary new method of projecting and displaying information. It uses a DMD micromirror device (Digital Micromirror Device) with extremely high reflectivity to control the angle of the micromirrors in its internal micromirror matrix to change the reflection angle of light, thereby forming a dark area in the designated area to avoid glare. At the same time, the most light is maintained on the road surface, except for specific areas where other vehicles exist. These areas are dynamically shielded by light patterns to ensure the maximum utilization of night lights and effectively improve night driving safety.

[0005] However, the existing technology only proposes the problem of adjusting the brightness and dark areas of automobile lights through DLP technology, and there is little research on control strategies. The control system structure is often complex, with low integration, complex circuit structure, and low control accuracy, and it is impossible to accurately control the lights to adjust the angle of light transmission and the size of the dark area. Summary of the invention

[0006] The purpose of the present invention is to overcome the problems of complex circuit structure and low control accuracy of the control system in the prior art, and to research and design a DLP-based pixel-based adaptive automobile headlight control system and control method with high control accuracy, rapid and sensitive response and good compatibility.

[0007] The technical solution adopted by the present invention to solve its technical problem is:

[0008] A pixel-based adaptive automobile headlight control system based on DLP, characterized by comprising:

[0009] An image processor connected to the CAN bus and used to collect an image of the vehicle's exterior;

[0010] An MCU chip, wherein the MCU chip receives the CAN message sent by the image processor, and parses and calculates the CAN message;

[0011] A DLP control chip, the DLP control chip receiving control information calculated by the MCU chip;

[0012] A DMD chip, wherein the DMD chip receives control information from the DLP control chip and changes the angles of the tiny reflective mirrors of its internal micromirror matrix according to the control information;

[0013] LED light source assembly;

[0014] An LED driver chip receives a PWM signal sent by the MCU chip and drives the LED light source assembly to turn on or off and the brightness;

[0015] The LED light source assembly emits a uniform light beam to the internal micromirror matrix of the DMD chip, and then the light beam is reflected by the internal micromirror matrix of the DMD chip and then emitted through an external lens.

[0016] Furthermore, the LED light source assembly includes an LED main light source, a condenser lens and a correction lens.

[0017] Furthermore, the DLP control chip sends an LED enable command to control the on and off of the LED driver chip.

[0018] Furthermore, the LED driver chip feeds back its own temperature information to the MCU chip through the DLP control chip in real time. The MCU chip adjusts the duty cycle of the PWM pulse signal emitted according to the temperature of the LED driver chip to adjust the current of the LED driver chip and ensure the safety of the LED driver chip.

[0019] Furthermore, the image processor sends the CAN message to the MCU chip through the CAN transceiver.

[0020] Compared with the prior art, the present invention obviously has the following beneficial effects:

[0021] 1. The DLP-based pixel-based adaptive automobile headlight control system of the present invention has a simple control method, high integration, simple circuit structure, high control accuracy, and rapid and sensitive response.

[0022] 2. The external communication adopts CAN bus, which has good compatibility, and the internal communication adopts IIC integrated bus, which can read and write data online, and the implementation method is simple.

[0023] 3. It has a complete circuit protection mechanism, which can adjust the brightness of the LED main light source and protect the circuit by adjusting the duty cycle of the PWM signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] Figure 1 It is a schematic diagram of a DLP-based pixel-based adaptive automobile headlight control system of the present invention;

[0026] Figure 2 It is a picture of light reflection when the micromirror of the DMD chip is in the "on" and "off" states.

[0027] In the figure: 1. Image processor, 2. CAN transceiver, 3. MCU chip, 4. DLP control chip, 5. LED driver chip, 6. LED light source component, 7. DMD chip, 8. External lens. DETAILED DESCRIPTION

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0029] like Figure 1-Figure 2The specific embodiment of the DLP-based pixel-based adaptive automobile headlight control system of the present invention shown in the figure includes: an image collector, a light source driving unit, a control unit and an execution unit. Among them, the light source driving unit includes an LED driving chip 5 and an LED light source assembly 6, and the LED light source assembly 6 includes an LED main light source, a focusing lens and a correction lens. The image collector is connected to the CAN bus to collect external images and send the external images to the control unit in the form of CAN messages. The control unit is mainly composed of a DLP control chip 4 and an MCU chip 3. The DLP control chip 4 and the MCU chip 3 are connected by an IIC bus. The MCU chip 3 and the image processor 1, i.e., the host computer, are connected by a CAN bus, and the signal is transmitted through a CAN transceiver 2. The execution unit is mainly composed of a DMD chip 7 and an external lens 8. The DMD chip 7 and the DLP control chip 4 are connected by multiple signal lines. The light emitted by the LED main light source is refracted by the focusing lens and the correcting lens to form a uniform light beam corresponding to the micromirror matrix of the DMD chip 7. The uniform light beam is transmitted to the reflector of the micromirror matrix of the DMD chip 7 and reflected. The reflected light is emitted through the external lens 8 to form the required headlight light shape.

[0030] Specifically, the image processor 1 collects external images and sends them to the MCU chip 3 via CAN messages. The MCU chip 3 analyzes and processes the CAN messages and sends the results to the DLP control chip 4. The DLP control chip 4 controls the DMD chip 7 according to the calculation results. The DMD chip 7 controls the light type of the car headlights. The DMD chip 7 turns the lens "on" and "off" by changing the angle of the tiny reflectors in its internal micromirror matrix. Figure 2 As shown, when the lens of the DMD chip 7 is in the "on" state, the light of the LED light source passes through the designated light path and is reflected by the lens. On the contrary, when the lens of the DMD chip 7 is in the "off" state, the light of the LED light source will be reflected to the non-designated light path area and will not be reflected by the lens, thereby achieving the purpose of automatically changing the light pattern. The DMD chip 7 changes the angle of the micromirror to reflect the required light to the projection lens of the DLP projection system, which is refracted by the refractive lens and emitted through the outer light distribution mirror of the car lamp to form the required light shape of the car headlight, ultimately achieving the purpose of anti-glare.

[0031] The DLP control chip 4 controls the on and off of the LED driver chip 5 by sending an LED enable command. The LED driver chip 5 can adjust the brightness of the LED light source assembly 6 by receiving the PWM signal sent by the control unit. The LED driver chip 5 feeds back its temperature information to the MCU chip 3 in real time through the DLP control chip 4, and the MUC chip adjusts the current of the LED chip by adjusting the duty cycle of the PWM signal to ensure the safety of the LED chip.

[0032] By adopting the headlamp control system of the present invention, the functions of high beam, low beam, AFS and ADB anti-glare lamp can be realized by one lamp, and the headlamp has a higher resolution.

[0033] Specifically, in this embodiment, the model of the CAN transceiver 2 is TJA1041A, the model of the MCU chip 3 is TMS320F28023, the model of the DLP control chip 4 is DLPC120, and the model of the LED driver chip 5 is TPS92602.

[0034] The control method of the DLP-based pixel adaptive headlight control system of this embodiment is:

[0035] 1. Power on the control unit and initialize each module of MCU chip 3;

[0036] 2. DLP control chip 4 is initialized;

[0037] 3. After the above initialization is completed, the control unit performs self-test, including: whether the working voltage meets the requirements, whether the communication between the MCU chip 3 and the DLP control chip 4 is normal, and whether the temperature of the LED light source assembly 6 meets the requirements;

[0038] 4. After the control unit passes the power-on self-test, the micro-mirror matrix of the DMD chip 7 is adjusted and controlled according to the control command of the image processor 1. The micro-mirror matrix of the DMD chip 7 reflects the required light to the projection lens of the DLP projection system, which is refracted by the refractive lens and emitted through the outer light distribution mirror of the lamp to form the required headlamp illumination light shape.

[0039] For ordinary technicians in this field, the specific embodiments are only illustrative descriptions of the present invention in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concepts and technical solutions of the present invention, or the concepts and technical solutions of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A pixel-based adaptive automobile headlight control system based on DLP, characterized in that: include: An image processor (1), the image processor (1) being connected to the CAN bus and used to collect an image of the vehicle's exterior; An MCU chip (3), wherein the MCU chip (3) receives a CAN message sent by the image processor (1), and parses and calculates the CAN message; A DLP control chip (4), wherein the DLP control chip (4) receives control information calculated by the MCU chip (3); A DMD chip (7), wherein the DMD chip (7) receives control information from a DLP control chip (4), and changes the angle of a tiny reflector of an internal micromirror matrix thereof according to the control information to realize the "on" and "off" of a lens, wherein when the lens of the DMD chip (7) is in an "on" state, light from an LED light source passes through a designated light path and is reflected out through the lens; and when the lens of the DMD chip (7) is in an "off" state, light from the LED light source is reflected to a non-designated light path area and is not reflected out through the lens; An LED light source assembly (6), the LED light source assembly (6) comprising an LED main light source, a condenser lens and a correction lens; An LED driver chip (5), the LED driver chip (5) receiving a PWM signal sent by the MCU chip (3) and driving the LED light source assembly (6) to turn on or off and to turn on the brightness, the LED driver chip (5) feeding back its own temperature information to the MCU chip (3) via the DLP control chip (4) in real time, the MCU chip (3) adjusting the duty cycle of the PWM pulse signal sent according to the temperature of the LED driver chip (5) to adjust the current of the LED driver chip (5) and ensure the safety of the LED driver chip (5); The LED light source assembly (6) emits a uniform light beam to the internal micromirror matrix of the DMD chip (7), and after being reflected by the internal micromirror matrix of the DMD chip (7), the light beam is emitted through an external lens (8).

2. The DLP-based pixel-based adaptive automobile headlight control system according to claim 1, characterized in that: The DLP control chip (4) sends an LED enable command to control the on and off of the LED driving chip (5).

3. The DLP-based pixel-based adaptive automobile headlight control system according to claim 1, characterized in that: The image processor (1) sends the CAN message to the MCU chip (3) via the CAN transceiver (2).

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