Intelligent vehicle-mounted electronic rearview mirror system based on optical fiber transmission

Abstract

The invention provides an intelligent vehicle-mounted electronic rearview mirror system based on optical fiber transmission, and the system comprises a camera module which is installed outside a vehicle body; the host is connected with the camera module through an optical fiber and is used for receiving and processing the video data acquired by the camera module; and the rearview mirror display screen is connected with the host and is used for displaying the video processed by the host. Data transmission is carried out through the optical fiber, high-speed and uncompressed video signal transmission is ensured, delay and data loss are reduced, and the stability and reliability of the system are improved. The camera module comprises a self-adaptive optical assembly, the self-adaptive optical assembly comprises a wavefront detector, a wavefront controller and a wavefront corrector, and the self-adaptive optical assembly can correct subtle image distortion introduced by lens deformation or aerodynamic effect during high-speed driving, so that the imaging definition under the extreme illumination condition is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive driving assistance systems, and particularly to an intelligent in-vehicle electronic rearview mirror system based on optical fiber transmission. Background Art

[0002] With the development of automotive intelligence, traditional mechanical rearview mirrors can no longer meet modern driving requirements. Electronic rearview mirrors, which have advantages such as clear images, wide fields of view, and no blind spots, have become the development direction of future vehicles. An electronic rearview mirror, also known as a camera monitoring system (CMS), is a technology that uses cameras and displays to replace traditional optical rearview mirrors. It captures images through cameras installed outside the vehicle and displays the images on a display screen inside the vehicle, providing the driver with a view of the surrounding environment of the vehicle.

[0003] For example, Chinese Utility Model Patent (CN202223577613.0) discloses an electronic rearview mirror system, including: a camera module, including a wide-angle lens and a light sensor electrically connected to the wide-angle lens; a display unit, electrically connected to the light sensor, the display unit including a main screen and a wide-angle screen disposed below the main screen; a control unit, capable of transmitting the complete imaging of the light sensor to the wide-angle screen, and the control unit can intercept a part of the imaging on the light sensor, and the control unit can magnify the part of the imaging and transmit it to the main screen. This solution only requires one wide-angle lens to achieve the effect of simultaneously displaying different range images on the main screen and the wide-angle screen, thereby reducing costs and power consumption.

[0004] However, in the above electronic rearview mirror system, the camera is vulnerable to interference from rain, snow, mud, fog, or strong light. In a complex light environment (such as entering or exiting a tunnel), the camera may not be able to quickly adjust the exposure, and the screen may briefly appear all black or all white. In the prior art, when the camera captures an image and transmits it to the display screen for display, it generally uses a CAN bus, a LIN bus, or other in-vehicle network protocols. The transmission bandwidth is low, and the video signal can only be encoded, compressed, and then transmitted, and then decoded to form a frame of image, resulting in low clarity of signal transmission and very large delays, which cannot meet the safety standards of high precision and low latency. Summary of the Invention

[0005] Based on the defects existing in the prior art, the present invention provides an intelligent in-vehicle electronic rearview mirror system based on optical fiber transmission, including:

[0006] A camera module, installed outside the vehicle body;

[0007] A host, which is connected to the camera module through an optical fiber, receives and processes the video data collected by the camera module;

[0008] A rearview mirror display screen, which is connected to the host and is used to display the video processed by the host.

[0009] Furthermore, the camera module includes a high-resolution CMOS sensor.

[0010] Furthermore, the camera module includes an adaptive optical component. The adaptive optical component includes a wavefront detector, a wavefront controller, and a wavefront corrector. The wavefront detector receives a small portion of light through a beam splitter, monitors the wavefront aberration of the light in real time, and transmits the data to the wavefront controller. The wavefront controller calculates the wavefront phase through a preset algorithm and generates corresponding adjustment instructions. The wavefront corrector adjusts each sub-module of the deformable mirror according to the instructions of the wavefront controller, receives most of the light through the beam splitter, compensates for the wavefront aberration, and focuses the corrected light on the CMOS sensor.

[0011] Furthermore, the camera module includes an electric lens and a control MCU. The CMOS sensor is electrically connected to the control MCU, and the control MCU is electrically connected to the electric lens. The host is connected to the control MCU through a CAN bus to transmit control instructions. The control MCU drives the electric lens to achieve electric zoom and autofocus according to the control instructions. The wavefront controller is connected to the host and outputs the status information of the adaptive optical component. The host cooperatively controls the electric lens and the adaptive optical component according to the status information.

[0012] Furthermore, the camera module includes a dynamic aperture and a control MCU. The CMOS sensor is electrically connected to the control MCU, and the control MCU is electrically connected to the dynamic aperture. The host is connected to the control MCU through a CAN bus to transmit control instructions. The control MCU drives the dynamic aperture to adjust the light flux according to the control instructions. The wavefront controller is connected to the host and outputs the status information of the adaptive optical component. The host cooperatively controls the dynamic aperture and the adaptive optical component according to the status information.

[0013] Furthermore, the camera module includes an intelligent environment perception unit. The intelligent environment perception unit includes a light sensor. The light sensor is connected to the control MCU through an I2C bus, and the control MCU is connected to the host through a CAN bus.

[0014] Furthermore, the camera module includes an intelligent environment perception unit and a heater. The intelligent environment perception unit includes a temperature sensor. The temperature sensor is connected to the control MCU through an I2C bus, and the control MCU is connected to the heater through a power switch.

[0015] Furthermore, the camera module includes a protective lens for protecting the camera. The heater includes a resistance wire arranged around the protective lens.

[0016] Further, the camera module includes an intelligent environment perception unit, the intelligent environment perception unit includes a humidity sensor, the humidity sensor is connected to the control MCU through the I2C bus, and the control MCU is connected to the host through the CAN bus.

[0017] Further, when a preset failure condition is met, the control MCU generates a specific fault code and sends the fault code and the identifier of the camera module to the host. The host sends an alarm instruction to the corresponding rearview mirror display screen, the rearview mirror display screen displays a warning message, and the vehicle's audio system plays a preset number of sound reminders at the same time.

[0018] Beneficial effects:

[0019] The technical solution of the present invention uses a high-resolution CMOS sensor, which can capture delicate image details and provide high-quality image data during driving. The data is transmitted through optical fibers to ensure high-speed and uncompressed video signal transmission, reduce latency and data loss, and improve the stability and reliability of the system. An adaptive optical adjustment component is provided, which can correct lens deformations caused by adverse weather (such as raindrops, heat waves / air disturbances), lens manufacturing tolerances, temperature changes, and even subtle image distortions introduced by aerodynamic effects during high-speed driving, further improving the imaging clarity under extreme lighting conditions. The light sensor monitors the ambient light changes in real time and adjusts through the electric lens and the dynamic aperture control unit. An intelligent environment perception unit is provided, integrating multiple sensors, including light, temperature, and humidity sensors, to monitor environmental changes in real time and automatically adjust the parameters of the camera and the display screen to ensure image quality. Description of the drawings

[0020] The following drawings only illustrate and explain the present invention schematically and do not limit the scope of the present invention.

[0021] Figure 1 It is a schematic diagram of an overall embodiment of the present invention. Detailed implementation manners

[0022] In order to have a clearer understanding of the technical features, objectives, and effects of this article, the detailed implementation manners of the present invention are now described with reference to the drawings. The same reference numerals represent the same parts in each figure. To make the drawings concise, the relevant parts of the present invention are schematically shown in each figure, rather than representing their actual structures as products. In addition, for the sake of simplicity and easy understanding of the drawings, in some figures, only one of the components with the same structure or function is schematically shown, or only one of them is labeled.

[0023] In the present invention, "connection" can include both direct connection and indirect connection, communication connection, and electrical connection, unless otherwise specified.

[0024] The terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the disclosure. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It will also be understood that when used in the specification, the terms "comprises" and / or "comprising" refer to the presence of the stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0025] The present invention provides an intelligent vehicle-mounted electronic rearview mirror system based on optical fiber transmission, as Figure 1 shown, which includes a camera module installed outside the vehicle body. Specifically, it includes camera modules installed on the left and right sides of the A-pillar of the vehicle. The camera module is connected to a host installed inside the vehicle body through an optical fiber, and the host receives and processes the video data collected by the camera module. The host is connected to the rearview mirror display screen through interfaces such as LVDS and MIPI DSI, and transmits the processed video to the rearview mirror display screen for display. The rearview mirror display screen includes two rearview mirror display screens respectively corresponding to the left and right camera modules and installed on the inner wall of the carriage.

[0026] The camera module includes a housing that protects all internal components from physical damage, dust, moisture, chemicals, etc. There is a window on the housing, and the window is sealed with a protective lens. Inside the housing, an electric lens, a dynamic aperture, an optical beam splitter, an adaptive optical component, and a CMOS sensor are sequentially arranged along the optical path direction away from the protective lens. A control MCU for controlling the electric lens and the dynamic aperture is also arranged inside the housing.

[0027] The CMOS sensor uses a high-resolution CMOS sensor, which can capture delicate image details and can provide high-quality image data during driving. The CMOS sensor is connected to a high-speed serializer chip through a high-speed serial interface (such as MIPI CSI-2), and the high-speed serializer chip is connected to an optical transmitter. The CMOS sensor captures light, converts it into an electrical signal, and sends the original video data to the high-speed serializer chip. The high-speed serializer chip converts / packs the MIPI data into a high-speed serial electrical signal suitable for long-distance transmission. This high-speed serial electrical signal is sent into the optical transmitter and converted into an optical signal.

[0028] The optical transmitter is connected to the fiber optic connector. The optical transmitter drives a light source (usually a laser diode LD or an LED, and LD is usually used for high-speed video), and modulates the on / off or intensity of the light source according to the input electrical signal. The generated optical signal is coupled to the fiber optic connector through internal connections. The optical signal is transmitted through the optical fiber connected between the camera module and the host. The optical fiber is connected to the fiber optic connector on the host, and the optical signal enters the optical receiver inside the host. The photodetector in the optical receiver detects the optical signal and converts it back into a weak electrical signal. This weak electrical signal is amplified and shaped by amplifiers (such as a transimpedance amplifier TIA and a limiting amplifier LA) and restored into a clear high-speed digital electrical signal. The restored high-speed serial electrical signal is sent to the deserialiser or the corresponding interface chip of the host. The deserialiser converts the serial signal back into a parallel or serial format (such as MIPI CSI-2, LVDS, PCIe, etc.) that can be processed by the internal processor (such as an SoC or an FPGA) of the host. The internal processor of the host receives the video data and performs subsequent tasks such as ISP processing, image analysis, fusion, and display driving.

[0029] The host is connected to the control MCU through the CAN bus to transmit control instructions. The CMOS sensor is electrically connected to the control MCU through a low-speed serial interface (such as I2C or SPI). When the host sends CAN instructions for configuring CMOS parameters (such as resolution and frame rate, exposure time, gain, working mode, trigger mode, etc.) to the control MCU, the control MCU converts these CAN instructions into low-speed serial commands that the CMOS sensor can process and sends them to the CMOS sensor to configure the CMOS sensor.

[0030] The control MCU is also electrically connected to the motorized lens and the dynamic aperture. The motorized lens includes multiple groups of lenses, and the multiple groups of lenses are moved back and forth by a micro motor (such as a voice coil motor, a stepper motor, or a piezoelectric motor) to change the focus. The lens also includes at least a zoom lens group and a compensation lens group that move in coordination, and are driven by a motor to keep the focus clear while changing the focal length (magnification). The dynamic aperture is located inside the lens (usually near the diaphragm position) and is usually composed of several overlapping blades. The opening and closing degree of the blades is controlled by a micro motor (such as a stepper motor or a galvanometer driver), thereby changing the size of the light passing aperture. The control MCU is connected to the motors of the motorized lens and the dynamic aperture through the motor driver. When receiving a control instruction from the host, the control MCU converts the control instruction into a low-level control signal for a specific motor (such as a step pulse, a voltage / current drive signal).

[0031] After the host receives the image data from the camera module, the processor in the host uses image processing algorithms (such as contrast detection, phase detection AF) to analyze the clarity of the image, determine whether it is out of focus currently and in which direction the focus needs to be adjusted, and send the corresponding control instructions to the control MCU. The control MCU controls the motorized lens to achieve autofocus. At the same time, the host can also analyze the overall brightness, highlight area, and dark area of the image, and combine information such as vehicle speed and ambient light sensor to decide the need to adjust the aperture size (and cooperate with adjusting the shutter speed and ISO gain) to obtain the best exposure. The control MCU controls the aperture motor driver according to the host instructions to drive the motor to adjust the opening and closing degree of the aperture blades until the aperture size specified by the instruction (or the position feedback by the sensor) is reached.

[0032] The adaptive optical component includes a wavefront detector, a wavefront controller, and a wavefront corrector. The wavefront detector receives a small part of the light through a beam splitter, monitors the wavefront aberration of the light in real time, and transmits the data to the wavefront controller. The wavefront controller calculates the wavefront phase through a preset algorithm and generates the corresponding adjustment instructions. The wavefront corrector adjusts each sub-module of the deformable mirror according to the instructions of the wavefront controller, receives most of the light through the beam splitter, compensates for the wavefront aberration, and becomes a plane wave or spherical wave close to the ideal. This "corrected" light finally focuses on the CMOS sensor to form a clearer and less distorted image. This detection - processing - correction process continuously cycles at an extremely high frequency (far exceeding the video frame rate, such as 500Hz - 2000Hz) to form a closed-loop system, adapting to and compensating for the dynamically changing wavefront aberration in real time.

[0033] The adaptive optical component works in coordination with the motorized lens and the dynamic aperture. The motorized lens is responsible for handling large-amplitude low-order aberrations, mainly defocus (focusing) and changing the field of view (zooming). It adjusts the basic imaging parameters of the entire optical system. The dynamic aperture is responsible for controlling the light flux entering the system and affects the depth of field and diffraction limit. The adaptive optical component is responsible for correcting finer high-order aberrations (such as the remaining parts of coma, astigmatism, spherical aberration, and random and dynamic aberrations caused by the atmosphere / environment / system imperfections). It measures the residual wavefront error under the current optical configuration (specific focal length, focusing distance, aperture size) and performs real-time correction. Moreover, the status information of the adaptive optical component (for example, the magnitude of the aberration that needs to be corrected currently) can be fed back to the host. If the adaptive optical component finds that the aberration to be corrected is too large (beyond the capability range of the wavefront corrector), the host may fine-tune the focus or aperture settings to find an optical configuration that allows the adaptive optical component to work in the best state. For example, slightly closing the aperture can reduce certain aberrations and relieve the burden on the adaptive optical component.

[0034] The camera module further includes an intelligent environment perception unit. The intelligent environment perception unit includes a light sensor. The light sensor is connected to the control MCU via the I2C bus. The light sensor senses the ambient light intensity around the camera. The light sensor converts the sensed light intensity into an electrical signal. The control MCU reads the light intensity value output by the light sensor through the I2C interface. The control MCU sends the read light intensity value (which can be the original value or a preliminarily processed value) to the host via the CAN bus between the control MCU and the host. After receiving the light intensity information, the host combines more comprehensive information (such as the real-time image analysis results of the CMOS sensor, vehicle speed, driving mode, etc.) to make a final exposure decision, and then sends specific instructions (such as "set the aperture to f / 2.8") to the control MCU. After receiving the instruction from the main ECU, the control MCU precisely controls the motor of the dynamic aperture to reach the specified position.

[0035] The intelligent environment perception unit further includes a temperature sensor. The temperature sensor is connected to the control MCU via the I2C bus. The control MCU is connected to a heater through a power switch. The heater includes a resistance wire disposed around the protective lens. The control MCU periodically (for example, several times per second or faster) reads the value of the temperature sensor through a specified interface to obtain the actual temperature near the current protective lens. Two key temperature thresholds are preset inside the control MCU: Startup threshold: For example, 5°C. When the actual temperature is lower than the startup threshold, it is considered that there is a risk of fogging / frosting / icing. Stop threshold: For example, 10°C. It must be higher than the stop threshold to form a hysteresis interval. The hysteresis interval (the range between the startup threshold and the stop threshold) can prevent the heater from frequently starting and stopping quickly when the temperature fluctuates slightly near the threshold, improving system stability and the lifespan of the relay / switch. If the heater is currently in the off state and the control MCU detects that the actual temperature is lower than the startup threshold, the control MCU sets the drive signal to a high level (or low level, depending on the drive circuit design), causing the power switch to conduct and the heater to start working. If the heater is currently in the on state and the control MCU detects that the actual temperature is higher than the stop threshold, the control MCU sets the drive signal to a low level (or high level), causing the power switch to turn off and the heater to stop working.

[0036] In order to control the temperature more accurately and improve energy efficiency, the control MCU can not only perform simple On / Off control, but also use PWM (pulse width modulation) signals to drive the power switch. The control MCU dynamically adjusts the duty cycle of the PWM signal according to the difference between the actual temperature and the target temperature (for example, a value slightly higher than the stop threshold), or according to a preset lookup table (different temperature ranges correspond to different PWM duty cycles). The duty cycle determines the proportion of the power switch on time in a PWM cycle. The higher the duty cycle, the greater the average power delivered to the heater, and the faster the heating / higher the temperature. This method can achieve proportional heating, so that the temperature of the protective lens is more steadily maintained in the target range, avoiding overshoot, and more energy-saving. For example, a higher duty cycle can be used to quickly heat up when just starting up, and the duty cycle can be reduced to maintain the temperature when approaching the target temperature.

[0037] The control MCU usually reports the current temperature, heater status (on / off, PWM duty cycle), whether there is a fault (such as sensor failure, heater open circuit / short circuit), and other information to the host through the control channel (CAN, Ethernet, GMSL back-channel, etc.). The host can send instructions to the control MCU based on the vehicle status (such as power management strategy, user settings, wiper status, etc.), such as forcing the heater to turn on / off, or adjusting the control threshold. The control MCU can monitor whether the temperature rises abnormally (which may be caused by a drive circuit failure or extremely high ambient temperature). If it exceeds the set maximum safe temperature, the heater will be forced to shut down and the fault will be reported to the host.

[0038] The intelligent environment sensing unit includes a humidity sensor, which is connected to the control MCU through the I2C bus. The humidity sensor is installed inside the camera module and can accurately reflect the air humidity in the sealed cavity of the camera module. The position avoids the direct influence of local heat sources (such as processors and heaters) to obtain representative readings.

[0039] The control MCU reads the internal humidity measured by the internal humidity sensor through I2C periodically (for example, every few seconds or tens of seconds). Define multiple humidity thresholds to determine waterproof failure, absolute high humidity threshold: for example, 85% or 90% RH. When the internal humidity exceeds this value for a long time, it is very likely that external moisture has invaded; rapid rise rate threshold: monitors the rate of change of humidity. If the internal humidity rises abnormally quickly in a short period of time, it may also be a sign of sealing failure; dew point comparison: calculates the dew point temperature of the internal air in combination with the internal temperature and internal humidity. The dew point refers to the temperature at which the air cools to a saturated state (begins to condense) under the current air pressure and water vapor content. If the internal temperature is lower than the dew point temperature, it means that condensation has occurred or is about to occur inside, which is very strong evidence of water ingress. At the same time, a safety margin can be set, and the start condition of the heater can be changed to the internal temperature being lower than (dew point temperature + safety margin), for example, dew point temperature + 2°C. In this way, heating is started only when the temperature of the protective lens is indeed close to or lower than the temperature at which condensation may occur, which is smarter and more energy-saving than simply based on a fixed temperature threshold. The stop condition analogy uses similar logic.

[0040] Just one reading exceeding the limit may not be enough to determine failure (it may be a transient interference or a temporary phenomenon in extreme environment). A confirmation time window needs to be set, for example, failure is confirmed only when the humidity is continuously above the threshold for more than 5 minutes (or N consecutive readings exceeding the limit). The control MCU can also detect whether the humidity sensor itself is faulty (for example, the reading is always 0%, 100% or communication fails), and report sensor failure instead of waterproof failure.

[0041] When the preset failure conditions are met (for example, the internal humidity > absolute high humidity threshold continues to exceed the confirmation time window, or internal condensation is detected), the control MCU generates a specific fault code and sends the fault code and the camera module identifier to the host. The host verifies the validity of the fault code and records it in the vehicle's diagnostic trouble code (DTC) memory for subsequent maintenance diagnosis. The host sends an alarm command to the corresponding rearview mirror display, the rearview mirror display displays a warning message, and the vehicle's audio system plays a preset number of sound reminders at the same time. This warning has a higher priority to ensure that the driver can see it. At the same time, manual confirmation by the user is required to temporarily eliminate it, but the fault status will continue to be recorded and re-prompted each time the vehicle is started until the problem is resolved.

[0042] The above is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment. It is clear to those skilled in the art that the form in the embodiment is not limited thereto, and the adjustable manner is not limited thereto. It is understood that other improvements and changes directly derived or associated with those skilled in the art without departing from the basic concept of the present invention should be considered to be included in the protection scope of the present invention.

Claims

1. An intelligent in-vehicle electronic rearview mirror system based on optical fiber transmission, characterized in that, Comprising: A camera module, installed outside the vehicle body; A main unit, which is connected to the camera module through an optical fiber, receives and processes the video data collected by the camera module; A rearview mirror display screen, which is connected to the main unit and is used to display the video processed by the main unit.

2. The intelligent vehicle-mounted electronic rearview mirror system based on optical fiber transmission according to claim 1, wherein The camera module includes a high-resolution CMOS sensor.

3. The intelligent in-vehicle electronic rearview mirror system based on optical fiber transmission according to claim 2, characterized in that, The camera module includes an adaptive optical component, and the adaptive optical component includes a wavefront detector, a wavefront controller, and a wavefront corrector. The wavefront detector receives a small part of the light through an optical beam splitter, monitors the wavefront aberration of the light in real time, and transmits the data to the wavefront controller. The wavefront controller calculates the wavefront phase through a preset algorithm and generates corresponding adjustment instructions. The wavefront corrector adjusts each sub-module of the deformable mirror according to the instructions of the wavefront controller, receives most of the light through the optical beam splitter, compensates for the wavefront aberration, and focuses the corrected light on the CMOS sensor.

4. The intelligent vehicle-mounted electronic rearview mirror system based on optical fiber transmission according to claim 3, characterized in that, The camera module includes an electric lens and a control MCU. The CMOS sensor is electrically connected to the control MCU, and the control MCU is electrically connected to the electric lens. The main unit is connected to the control MCU through a CAN bus to transmit control instructions. The control MCU drives the electric lens to achieve electric zoom and autofocus according to the control instructions. The wavefront controller is connected to the main unit and outputs the status information of the adaptive optical component. The main unit cooperatively controls the electric lens and the adaptive optical component according to the status information.

5. The intelligent vehicle-mounted electronic rearview mirror system based on optical fiber transmission according to claim 3, characterized in that, The camera module includes a dynamic aperture and a control MCU. The CMOS sensor is electrically connected to the control MCU, and the control MCU is electrically connected to the dynamic aperture. The main unit is connected to the control MCU through a CAN bus to transmit control instructions. The control MCU drives the dynamic aperture to adjust the light flux according to the control instructions. The wavefront controller is connected to the main unit and outputs the status information of the adaptive optical component. The main unit cooperatively controls the dynamic aperture and the adaptive optical component according to the status information.

6. The intelligent vehicle-mounted electronic rearview mirror system based on optical fiber transmission according to claim 1, characterized in that, The camera module includes an intelligent environment perception unit, and the intelligent environment perception unit includes a light sensor. The light sensor is connected to the control MCU through an I2C bus, and the control MCU is connected to the main unit through a CAN bus.

7. The intelligent vehicle-mounted electronic rearview mirror system based on optical fiber transmission according to claim 1, characterized in that, The camera module includes an intelligent environment perception unit and a heater. The intelligent environment perception unit includes a temperature sensor. The temperature sensor is connected to the control MCU through an I2C bus, and the control MCU is connected to the heater through a power switch.

8. The intelligent in-vehicle electronic rearview mirror system based on optical fiber transmission according to claim 7, characterized in that, The camera module includes a protective lens for protecting the camera, and the heater includes a resistance wire arranged around the protective lens.

9. The intelligent vehicle-mounted electronic rearview mirror system based on optical fiber transmission according to claim 1, characterized in that, The camera module includes an intelligent environment perception unit, and the intelligent environment perception unit includes a humidity sensor. The humidity sensor is connected to the control MCU through an I2C bus, and the control MCU is connected to the main unit through a CAN bus.

10. The intelligent vehicle-mounted electronic rearview mirror system based on optical fiber transmission according to claim 9, characterized in that, When a preset failure condition is met, the control MCU generates a specific fault code and sends the fault code and the identifier of the camera module to the main unit. The main unit sends an alarm instruction to the corresponding rearview mirror display screen, and the rearview mirror display screen displays a warning message. The vehicle's audio system simultaneously plays a preset number of sound reminders.

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