Light driving control system and method based on 48V system and electronic equipment

Abstract

The invention relates to a light driving control system and method based on a 48V system and electronic equipment, and relates to the field of vehicle control. The system comprises a power supply module, an information acquisition module, a central processing module, a communication module and an execution module, the power supply module is used for reducing 48V voltage input by a whole vehicle to obtain preset voltage, and the information acquisition module is used for receiving a light control instruction of the whole vehicle and acquiring a working state of a lamp; the central processing module processes collected data and issues an instruction to the execution module, the communication module achieves information interaction with the whole vehicle and the load lamp, and the execution module provides power supply and drive control for the external load lamp. The system can solve the challenges of a traditional 12V system in the aspects of power output, energy loss, line load and the like, reduces the current intensity, line loss and heat productivity through a 48V system, prolongs the service life of a lamp and a controller, improves the autonomous controllability and the supply chain stability through a domestic chip scheme, and reduces the system cost.

Description

Technical Field

[0001] This invention relates to the field of vehicle control, and in particular to a lighting drive control system, method, electronic device, and storage medium based on a 48V system. Background Technology

[0002] Today, automotive 12V systems are encountering more and more development bottlenecks, and the development of 48V systems is gradually gaining attention from OEMs.

[0003] Most current automotive platforms use 12V systems, which have relatively low power output. For devices that require higher power, such as high-power audio systems or high-power heaters, 12V voltage may not be sufficient. At the same time, more current is needed when transmitting current, which may lead to energy loss and circuit overload. With the development of automotive intelligence and electrification, the power and energy requirements of electrical systems are getting higher and higher, and the 12V system is becoming increasingly inadequate in these aspects.

[0004] Currently, most smart lighting terminals are 12V systems, and they are primarily designed using imported chips, resulting in high costs, unstable supply chains, and poor self-control. To meet the lighting demands of high-power lights, 12V smart lighting terminals require significantly higher current. For the same power requirement, the current intensity of a 12V system is four times that of a 48V system. This higher current leads to increased line losses and heat generation, thus shortening the lifespan of the lights and controllers. Another drawback is lower energy efficiency; high current can easily cause voltage drops, especially in long-distance power supply scenarios, where insufficient voltage at the end of the 12V system may cause a decrease in light brightness, affecting the actual lighting effect. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a lighting drive control system, method, electronic device and storage medium based on a 48V system, which aims to solve the technical problems of traditional 12V systems in terms of power output, energy loss and line load, making it difficult to meet the technical requirements of modern automobiles for high-power lighting systems.

[0006] This invention provides the following solution:

[0007] According to one aspect of the present invention, a lighting drive control system based on a 48V system is provided, comprising:

[0008] Power supply module, information acquisition module, central processing module, communication module, and execution module;

[0009] The power module is used to step down the 48V input voltage of the vehicle to obtain a preset voltage;

[0010] The information acquisition module is configured to receive vehicle lighting control commands, collect the working status of the controlled lights, and the operating status data of the module assembly itself.

[0011] The central processing module is configured to process the data collected by the information acquisition module, issue drive control commands to the execution module, and realize information interaction with the whole vehicle and the load lights through the communication module;

[0012] The communication module includes a vehicle body CAN communication unit and a load lamp communication unit, which respectively realize command transmission with the whole vehicle, status feedback and communication adaptation with the load lamps;

[0013] The execution module is configured to provide power and drive control to the external load lighting fixtures according to the instructions of the central processing module.

[0014] Furthermore, the power module includes: a 12V power supply unit and a 5V power supply unit;

[0015] A 12V power supply unit is used to convert 48V voltage to 12V voltage;

[0016] A 5V power supply unit is used to provide a stable power supply to the components.

[0017] Furthermore,

[0018] The information acquisition module includes: a digital input / output unit, an analog input unit, and a sensor data acquisition unit;

[0019] Digital input / output units are used for signal transmission and buffering, enhancing I / O drive capabilities;

[0020] The analog input unit is used to expand the analog input interface of the MCU;

[0021] The sensor data acquisition unit is used to acquire brightness data from the photosensitive sensor and temperature data from the thermal sensor, and convert them into voltage signals to be fed back to the central processing module.

[0022] Furthermore, it also includes a fault diagnosis module, which is configured to perform power fault diagnosis, communication fault diagnosis, sensor fault diagnosis and lamp board feedback diagnosis.

[0023] The power supply fault diagnosis method collects the power supply voltage and judges the high voltage state, normal state, low voltage state and reset state according to the preset voltage steps, and restricts the operation of the corresponding load under the high voltage or low voltage state.

[0024] The communication fault diagnosis configuration is to automatically restart the CAN function until it returns to normal when a busoff error occurs on the CAN bus;

[0025] The sensor fault diagnosis achieves fault logic judgment by analyzing the voltage signal converted by the sensor and calculating the corresponding resistance value, temperature value and brightness value.

[0026] The lamp board feedback diagnostic configuration is to receive open circuit and short circuit fault information reported by the load lamp board and feed it back to the vehicle through the communication module.

[0027] Furthermore, the execution module includes:

[0028] High-side drive unit, stepper motor drive unit, constant voltage output unit, and constant current drive unit;

[0029] The high-side drive unit is used to implement load switching control and overcurrent and overheat protection;

[0030] The stepper motor drive unit is used to adjust the illumination angle of the lamp and supports micro-step switching function;

[0031] The constant voltage output unit achieves constant voltage output and PWM dimming via the SPI interface;

[0032] The constant current drive unit is used to provide a constant current drive output for the load under a wide voltage input range.

[0033] Furthermore, including:

[0034] The central processing module is configured with a key acquisition and debounce algorithm. The key acquisition and debounce algorithm adopts a state machine method, which achieves high-reliability key recognition by recording the level state, counting the number of valid key acquisitions and comparing them with the preset number of filtering key acquisitions.

[0035] Furthermore, including:

[0036] The CAN bus communication configuration of the communication module has a receive queue and a transmit queue. Data entry and exit are managed by dual pointers, and synchronization and mutual exclusion of multi-task access are achieved by combining a mutex lock.

[0037] According to a second aspect of the present invention, a lighting drive control method based on a 48V system is provided, comprising the following steps:

[0038] Hybrid power supply adaptation steps: Receive the 48V bus voltage of the whole vehicle, generate low-voltage power supply for the logic control components and medium-voltage power supply for the drive circuit through voltage conversion, and selectively retain the 48V voltage to directly power high-voltage loads, forming a multi-voltage level hybrid power supply mode.

[0039] Multi-source data acquisition steps: Acquire control data and transmit it to the control core, including lighting control commands issued by the vehicle, working status feedback data of the controlled lights, and the self-operating status data of the control system, which includes power status data and environmental perception data;

[0040] Data parsing and instruction generation steps: The control core parses and processes the collected multi-source data, and generates corresponding drive control instructions according to the preset control strategy. The drive control instructions are used to realize the switching on and off of lights, parameter adjustment or dynamic effect control.

[0041] Two-way communication adaptation steps: The system transmits commands and provides status feedback to the vehicle via the vehicle standard bus, and at the same time, it converts communication protocols to achieve compatible communication with different types of load lights, ensuring two-way interaction between command issuance and status feedback.

[0042] Load drive execution steps: In response to the drive control command, provide appropriate power supply and drive control to the external load lamp to realize the preset lighting function or dynamic lighting effect.

[0043] According to three aspects of the present invention, an electronic device is provided, comprising: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus;

[0044] The memory stores a computer program, which, when executed by the processor, causes the processor to perform steps of a lighting drive control method based on a 48V system.

[0045] According to four aspects of the present invention, a computer-readable storage medium is provided that stores a computer program executable by an electronic device, which, when run on the electronic device, causes the electronic device to perform the steps of a lighting drive control method based on a 48V system.

[0046] Compared with the prior art, the present invention has the following advantages:

[0047] This application utilizes a hybrid power supply adaptation method, enabling the system to directly power high-voltage loads using 48V, avoiding the energy loss associated with converting entirely to 12V and improving energy efficiency. Furthermore, the system incorporates fault diagnosis capabilities, promptly identifying and addressing system anomalies through power supply fault diagnosis, communication fault diagnosis, sensor fault diagnosis, and lamp board feedback diagnosis, ensuring the safe and stable operation of the lighting system. This solution not only overcomes the challenges of traditional 12V systems in terms of power output, energy loss, and line load, but also provides a more intelligent, efficient, and reliable solution for automotive lighting control, significantly enhancing driving comfort and safety. Attached Figure Description

[0048] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0049] Figure 1 This is a structural diagram of a lighting drive control system based on a 48V system provided by one or more embodiments of the present invention.

[0050] Figure 2 This is a flowchart of a lighting drive control method based on a 48V system provided by one or more embodiments of the present invention.

[0051] Figure 3 This is a system principle framework diagram of a lighting drive control system based on a 48V system according to a specific embodiment of the present invention.

[0052] Figure 4 This is a system timing diagram of a lighting drive control system based on a 48V system according to a specific embodiment of the present invention.

[0053] Figure 5 This is a partial hardware block diagram of a combined lamp driver for a lighting drive control system based on a 48V system, according to a specific embodiment of the present invention. Figure 1 .

[0054] Figure 6 This is a partial block diagram of the hardware principle of a combined lamp driver for a lighting drive control system based on a 48V system, according to a specific embodiment of the present invention. Figure 2 .

[0055] Figure 7 This is a partial hardware block diagram of a combined lamp driver for a lighting drive control system based on a 48V system, according to a specific embodiment of the present invention. Figure 3 .

[0056] Figure 8 This is a partial block diagram of the hardware principle of a combined lamp driver for a lighting drive control system based on a 48V system, according to a specific embodiment of the present invention. Figure 4 .

[0057] Figure 9 This is a partial block diagram of the hardware principle of a combined lamp driver for a lighting drive control system based on a 48V system, according to a specific embodiment of the present invention. Figure 5 .

[0058] Figure 10This is a block diagram of an electronic device structure for a lighting drive control method based on a 48V system, provided by one or more embodiments of the present invention. Detailed Implementation

[0059] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] Current automotive electrical systems are upgrading from traditional 12V to 48V, but existing lighting smart terminals based on 12V designs have significant shortcomings in power density, line voltage drop, thermal management, and supply chain security: the current drawn by a 12V system is four times that of a 48V system at the same power, leading to cable losses. The system suffers from several drawbacks: significantly increased voltage at the terminal, severe voltage drop, accelerated temperature rise, and shortened lifespan of luminaires and controllers. Furthermore, its reliance on imported driver and power management chips leads to high costs, long supply cycles, and poor self-control. Moreover, the 12V system struggles to support the demands of new intelligent luminaires with high dynamic response and high power density, such as ADB adaptive high beam and matrix LED systems.

[0061] Figure 1 This is a structural diagram of a lighting drive control system based on a 48V system provided by one or more embodiments of the present invention.

[0062] like Figure 1 As shown, it includes:

[0063] Power supply module, information acquisition module, central processing module, communication module, and execution module;

[0064] The power module is used to step down the 48V input voltage of the vehicle to obtain a preset voltage;

[0065] The information acquisition module is configured to receive vehicle lighting control commands, collect the working status of the controlled lights, and the operating status data of the module assembly itself.

[0066] The central processing module is configured to process the data collected by the information acquisition module, issue drive control commands to the execution module, and realize information interaction with the whole vehicle and the load lights through the communication module;

[0067] The communication module includes a vehicle body CAN communication unit and a load lamp communication unit, which respectively realize command transmission with the whole vehicle, status feedback and communication adaptation with the load lamps;

[0068] The execution module is configured to provide power and drive control to the external load lighting fixtures according to the instructions of the central processing module.

[0069] Specifically, the power module is used to step down the 48V input voltage of the vehicle to obtain a preset voltage. The preset voltage refers to the different DC voltage levels required for the operation of different functional units in the system, including but not limited to 5V (used by low-power circuits such as MCU core logic, sensor signal conditioning, and CAN transceiver), 12V (used by medium-power execution units such as high-side drive, stepper motor drive, and some lamp board interface circuits), and retaining the unconverted 48V bus voltage under specific operating conditions (directly supplied to devices in the constant current / constant voltage drive unit that support wide voltage input, in order to reduce the number of DC-DC stages and improve overall energy efficiency). The voltage conversion topology of this module can be selected from Buck, Buck-Boost, or multi-channel synchronous rectification architectures according to actual needs. Its input withstand voltage range is no less than 6V–75V, and it has overvoltage, undervoltage, overcurrent, short circuit, and thermal protection functions. For example, a 12V output can be achieved using the JWQ6346A chip from Jiewat, and a 5V output can be achieved using the LN232435AQ1CHR chip from Lingxin. Both support the ASIL-B functional safety level requirements and integrate hardware watchdog and fault reporting pins, which facilitates the central processing module to monitor the power supply health status in real time.

[0070] The information acquisition module is configured to receive vehicle lighting control commands, collect the operating status of the controlled lights, and the module assembly's own operating status data. Vehicle lighting control commands include, but are not limited to, enabling low beams, enabling high beams, turn signal flashing duty cycle, daytime running light brightness setting, and ADB zone switch commands, etc., transmitted via the vehicle's CAN bus in standardized message formats (such as SAE J1939 or AUTOSAR CAN). The module receives data from the TP (Transmission Terminal); the controlled lighting fixture's operating status data includes LED open / short circuit feedback, channel enable status, temperature alarm flag, actual value of dimming PWM duty cycle, etc., which are transmitted back by the load lighting fixture's communication unit; the module assembly's own operating status data includes power supply voltage (Vbat), internal temperature, CAN bus error count, sensor ADC sampling value, button level status, etc. Among them, environmental perception data is collected by the voltage divider circuit of the photosensitive sensor and the thermal sensor, converted into digital quantities by the MCU's built-in ADC, and then converted into illuminance (lux) and temperature (°C) according to the calibration curve; the signal conditioning circuit of this module can set the input impedance, filtering bandwidth and reference voltage according to the actual situation. For example, the switch input can use the Taisiwei TCIB04A-T5A1 chip to enhance the driving capability and anti-interference margin, and the analog input can use the Runshi RS2260XTSS16-Q1 chip to expand the channel multiplexing capability. This application embodiment does not make any special limitations on this.

[0071] The central processing module is configured to process the data acquired by the information acquisition module, issue drive control commands to the execution module, and realize information interaction with the vehicle and load lights through the communication module. The central processing module adopts an automotive-grade microcontroller that meets ASIL-B functional safety requirements, such as the Zhixin Z20K146MCMLLT chip, which is equipped with an ARM Cortex-M4F core, a main frequency of 160MHz, 2MB PFLASH program memory and 128KB DFLASH data memory, and integrates 8-channel CAN. The FD controller has a 6-channel UART / LIN interface and supports hardware CRC check, memory protection unit (MPU), and lockstep core mechanism. The module runs an embedded real-time operating system (such as FreeRTOS). Its software architecture includes an initialization module, sensor data processing module, control logic module, power management module, network communication module, sleep wake-up control module, fault diagnosis module, and main control loop. The modules communicate decoupledly through message queues or event groups to ensure task scheduling determinism. The control logic module generates drive instructions based on a preset strategy model (such as a light intensity-temperature-vehicle instruction joint decision table). The instructions include parameters such as target channel enable bit, PWM reference frequency, microstep subdivision coefficient, and constant current setpoint. All instructions are verified and then sent to the corresponding peripheral registers of the execution module.

[0072] The communication module includes a vehicle body CAN communication unit and a load lamp communication unit, which respectively realize command transmission and status feedback with the vehicle and communication adaptation with the load lamps. The vehicle body CAN communication unit uses a 3PEAK TPT1043Q CAN transceiver, supporting a baud rate of 500kbit / s, standby / ultra-low power sleep mode and local / remote bus wake-up, realizing static power consumption control of the whole unit and coordination with the vehicle CAN network; the load lamp communication unit uses a TPT1042Q UART-CAN protocol conversion chip to complete the protocol bridging between the MCU UART peripheral and external lamp boards such as TLD7002 and TLX7109, compatible with the private instruction sets of multiple lamp boards, and this unit supports dual CAN channels independently configured, one is the vehicle body CAN for communication with the vehicle controller (VCU), and the other is the load lamp CAN (which can be further subdivided into constant current matrix CAN and constant voltage matrix CAN), realizing point-to-point or broadcast communication with lamps with different electrical characteristics.

[0073] The CAN bus manages the receive and transmit queues through a dual-pointer ring buffer, combined with mutex locks or interrupt masking mechanisms, to ensure data integrity and synchronization under multi-task access and avoid frame loss or overwriting in high-load scenarios. In this application, the CAN message ID allocation, DLC length, signal mapping relationship and UDS ISO 14229 diagnostic service can all be flexibly configured according to the vehicle manufacturer's specifications without special limitations.

[0074] The execution module, following instructions from the central processing module, provides power and drive control for external load lighting fixtures. It integrates multiple types of drive units to adapt to different lighting fixture electrical characteristics: switch-type loads are controlled by the high-side drive unit for on / off control and overcurrent / overheat protection; angle-adjustable lighting fixtures (such as ADB modules) are controlled by the stepper motor drive unit for microstepping up to 1 / 32 step and stall detection; constant voltage LED boards are configured with output voltage and PWM dimming parameters via the SPI interface by the constant voltage output unit; and constant current LED bead arrays are maintained with a constant output current of no less than 1.6A by the constant current drive unit under a wide input voltage range of 4.5V–65V. The enable, current sampling feedback, and temperature monitoring pins of each drive unit are connected to the corresponding GPIO / ADC channels of the central processing module to form a closed-loop control. The drive units can be selected from chips such as WSD7025AD, NSD8381-Q1QANR, IND87682, and IND87520, or can be replaced by devices with equivalent performance and functional safety levels.

[0075] Specifically, the power supply module performs graded conversion of the vehicle's 48V bus voltage, providing differentiated power supplies to the logic side (5V), drive side (12V), and high-voltage direct drive side (48V), reducing DC-DC stages and lowering energy consumption. The information acquisition module gathers vehicle commands, lighting status, and system self-test data, providing complete sensory input to the central processing module. The central processing module generates refined drive commands through multi-source data fusion analysis and transmits them via a dual-channel CAN architecture. The body CAN ensures vehicle-level command issuance and status feedback, while the load lighting CAN uses UART-CAN protocol conversion to achieve plug-and-play compatibility with heterogeneous lighting panels. The execution module performs actions such as lighting switch-on, dimming, and angle adjustment according to the commands, constructing a closed loop of perception, decision-making, and execution. This mechanism supports upgrades to the vehicle's 48V electrical system without replacing the original 12V lighting fixtures, while meeting the technical requirements of high power, low loss, strong compatibility, and full autonomous controllability.

[0076] In an optional embodiment, addressing the technical problems in existing lighting control methods, such as the lack of systematic integration of the advantages of 48V power supply, the absence of multi-source data fusion strategies, rigid communication adaptation, and coarse drive execution, which prevent the full potential of 48V systems in the field of intelligent lighting from being realized, this application also provides a lighting drive control method based on a 48V system, comprising the following steps:

[0077] Hybrid power supply adaptation step S1: Receive the 48V bus voltage of the whole vehicle, generate low-voltage power supply for the adaptation logic control components and medium-voltage power supply for the adaptation part of the drive circuit through voltage conversion, and selectively retain the 48V voltage to directly power high-voltage demand loads, forming a multi-voltage level hybrid power supply mode.

[0078] Among them, the low-voltage power supply for the logic control components refers to providing a stable operating voltage for the digital logic units in the central processing module, communication module, and information acquisition module. The voltage level can be 5V. This voltage is used to ensure the normal operation of low-power, high-precision functional units such as MCU, CAN transceiver, and ADC sampling circuit. Its role is to support the data processing, instruction parsing, and communication scheduling capabilities of the core control system and avoid logic misjudgment or communication interruption due to voltage fluctuations.

[0079] The medium-voltage power supply for the adapter part of the drive circuit refers to providing power to the functional units in the execution module that require medium voltage drive. Its voltage level can be 12V. This voltage is used to drive execution units such as high-side switches and stepper motor driver chips that have certain power output capabilities and require response speed and thermal stability. Its function is to reduce the line current density while ensuring the driving capability, thereby reducing PCB wiring loss and temperature rise.

[0080] Selectively retaining 48V voltage to directly power high-voltage demand loads means that for loads with wide input voltage adaptability (e.g., supporting 4.5V–65V), such as high-power LED beads and matrix high-beam modules connected to the constant current drive unit, the intermediate DC-DC conversion stage is skipped, and the vehicle's 48V bus voltage is directly connected to the input terminal of the constant current drive unit after passing through the protection circuit. Its function is to eliminate first-stage conversion losses, improve overall energy utilization efficiency, and enhance transient response capability in high-power lighting scenarios.

[0081] Specifically, by grading and selectively directly supplying the 48V bus according to functional requirements, the electrical decoupling and coordination of logic control, medium-power drive and high-voltage load power supply are achieved, which not only ensures system reliability but also improves energy conversion efficiency.

[0082] Multi-source data acquisition step S2: Collect three types of core data and transmit them to the control core, including the lighting control commands issued by the vehicle, the working status feedback data of the controlled lights, and the self-operating status data of the control system, which includes power status data and environmental perception data.

[0083] Among them, the lighting control commands issued by the vehicle refer to the command frames that are periodically or event-triggered by the vehicle controller (VCU) or body domain controller (BCU) through the vehicle standard bus (such as CAN 2.0B or CAN FD). The content may include the lighting switch status, brightness setting value, target illumination angle value, dynamic effect type encoding, etc. Its function is to serve as the upper-level decision input and form the starting signal source of the control closed loop.

[0084] The operating status feedback data of the controlled lighting fixtures refers to the status information transmitted back by the external load lighting fixtures (such as LED light boards with integrated TLD7002 driver chips) through the communication module. It may include channel open / short circuit indicators, LED junction temperature, measured value of drive current, PWM duty cycle feedback, fault codes, etc. Its function is to provide the control core with real feedback on the execution results, and support closed-loop regulation and fault identification.

[0085] The self-operating status data of the control system refers to the operating parameters generated internally by the system, which includes two parts:

[0086] Power status data can include 48V bus voltage, 12V output voltage, 5V output voltage, power chip temperature, input current, etc. Its function is to reflect the health status of the power supply link and provide a basis for hybrid power supply path selection and load enable control.

[0087] Environmental perception data can be the illuminance voltage signal output by the photosensitive sensor and the temperature voltage signal output by the thermal sensor. Its function is to characterize the external light intensity of the vehicle and the operating temperature of the lamps, and to support the generation of adaptive lighting strategies.

[0088] Data parsing and instruction generation step S3: The control core parses and processes the collected multi-source data, and generates corresponding drive control instructions according to the preset control strategy. The drive control instructions are used to realize the switching on and off of lights, parameter adjustment or dynamic effect control.

[0089] The control core refers to the embedded processor that runs the control logic in the central processing module. It can be the Z20K146MCMLLT chip, which has an ARM Cortex-M4F core and multiple CAN FD interfaces. Its role is to undertake data fusion, strategy matching and instruction orchestration tasks, and it is the decision-making center of the entire method process.

[0090] Preset control strategies refer to a set of rules or mapping relationships stored in memory. These can be lookup tables (LUTs), fuzzy inference rule bases, lightweight PID control models, or state machine-driven logic branches. Their function is to transform multi-source input data into executable control actions, reflecting the level of system intelligence.

[0091] Drive control instructions refer to specific operation commands for the execution module. They can be expressed as: the enable signal level of the high-side drive unit, the target microstep number and direction signal of the stepper motor drive unit, the SPI register write value of the constant voltage output unit (including voltage setting and PWM duty cycle), and the current setting code and dimming enable bit of the constant current output unit. Their function is to directly drive each execution unit to generate physical output.

[0092] This application combines multi-source data with preset strategies to achieve semantic mapping and engineering transformation from abstract instructions to specific driving actions, enabling lighting control to be both deterministic and adaptive.

[0093] Two-way communication adaptation step S4: The vehicle standard bus is used to realize command transmission and status feedback with the whole vehicle. At the same time, the communication protocol conversion is used to realize compatible communication with different types of load lamps, ensuring two-way interaction between command issuance and status feedback.

[0094] Among them, the vehicle standard bus refers to the CAN bus that conforms to the ISO 11898-2 specification. Its function is to serve as the standard communication medium for the whole vehicle network and ensure interoperability with upper-level controllers such as VCU and BCM.

[0095] Communication protocol conversion refers to the semantic mapping and frame format re-encapsulation between different protocol stacks in the communication module of the control system. It can be a conversion between UART protocol and CAN protocol. For example, it can parse the UART frame from the TLD7002 lamp board into CAN ID+Data format and forward it to the vehicle CAN network, or extract the control field from the vehicle CAN frame and encapsulate it into UART command and send it to the lamp board. Its function is to break down the barriers of proprietary protocols of lamp manufacturers and realize transparent interoperability between heterogeneous devices.

[0096] This application achieves semantic alignment and data connectivity between the vehicle command layer and the lighting execution layer by designing a domain-based communication interface and introducing a protocol conversion mechanism, supporting plug-and-play and unified management of multi-brand lighting fixtures.

[0097] Load drive execution step S5: In response to the drive control command, provide appropriate power supply and drive control for the external load lamp to realize the preset lighting function or dynamic lighting effect.

[0098] Among them, the response-driven control instruction refers to the corresponding action performed by each functional unit in the execution module according to the control signal issued by the central processing module. Its response process can be level triggering, register writing or pulse edge capture; its function is to convert digital control instructions into physical layer electrical signal output.

[0099] Providing suitable power supply and drive control for external load lighting fixtures means enabling the appropriate power supply path and drive mode according to the different load types: for traditional 12V halogen lamps or LED lamps, the 12V power supply unit is enabled and the high-side drive unit performs switching control; for constant current LED modules that support 48V direct drive, the 48V direct supply path is enabled and the constant current drive unit performs current closed-loop regulation; for ADB modules that require angle adjustment, the 12V power supply is enabled and the stepper motor drive unit performs micro-step positioning; its function is to achieve precise matching of power supply and drive, taking into account both compatibility and performance;

[0100] Preset lighting functions or dynamic lighting effects refer to basic functions defined by vehicle commands (such as low beam activation and high beam flashing) or advanced effects generated autonomously by the system (such as rain and fog enhancement mode, welcome lights, and dynamic steering extension). Their presentation depends on the coordinated actions of each unit in the execution module. Their purpose is to meet the diverse lighting needs of users and the trend of intelligent vehicle evolution.

[0101] This application achieves high-fidelity reproduction of control commands to physical lighting effects through differentiated drive path configuration and multi-execution unit collaborative scheduling, supporting the dual capabilities of basic lighting and intelligent light and shadow expression.

[0102] This application establishes an efficient energy supply foundation through a hybrid power supply adaptation step, constructs comprehensive sensing input through a multi-source data acquisition step, completes intelligent decision transformation through data parsing and command generation steps, establishes information interaction links through a two-way communication adaptation step, and finally achieves precise physical layer output through a load-driven execution step. The five steps form a closed-loop control flow of "energy-sensing-decision-interaction-execution". The newly added technical features in each step support each other and progress step by step, jointly solving the problems of low power supply efficiency, data silos, communication incompatibility and imprecise execution in existing technologies, thereby achieving highly reliable, highly compatible and highly intelligent lighting drive control on a 48V system platform.

[0103] Figure 3 This is a system principle framework diagram of a lighting drive control system based on a 48V system according to a specific embodiment of the present invention.

[0104] like Figure 3As shown, the 8V intelligent lighting terminal system mainly consists of five parts: a power supply module, an information acquisition module, a central processing module, a communication module, and an execution module. The main function of the power supply module is to step down the 48V input voltage from the vehicle to obtain 12V and 5V power for the other four modules. The main function of the information acquisition module is to receive lighting request commands from the vehicle, monitor the working status of the controlled lights, and collect the working status of the intelligent lighting terminal itself. The main function of the central processing module is to process the information collected by the information acquisition module and issue commands to the drive execution module according to the vehicle's instructions. Simultaneously, the central processing module also controls the load lights to work according to the vehicle's requirements via CAN communication. The communication module is divided into body CAN, constant current matrix CAN, and constant voltage matrix CAN. The body CAN is mainly responsible for CAN communication with the vehicle, receiving commands from the vehicle and feeding back the working status. The constant current matrix CAN and constant voltage matrix CAN are mainly responsible for communicating with the load lights, controlling the lights' operation, and receiving feedback from the load. The execution module's function is to supply power to the external load lights and drive the external loads according to the commands issued by the central processing module. The 48V intelligent lighting terminal system enables intelligent control of the vehicle's external lighting, achieving the goals of intelligence, comfort, and safety.

[0105] Figure 4 This is a system timing diagram of a lighting drive control system based on a 48V system according to a specific embodiment of the present invention.

[0106] like Figure 4 As shown, the lighting controller (LC) is located on the far left and serves as the starting point of the entire process; it receives the status from the push-button switches; executes the push-button switch logic; receives sensor data and controls the brightness and temperature of the lights based on this data; requests the power status and receives the power status information, only turning on the load when the voltage is normal; receives control commands sent by the main controller via the CAN bus and executes the corresponding control logic; and directly processes the status and fault information and sends it to the CAN bus.

[0107] Push-button switch (SW): Specifically handles functions related to push-button switches, receives the push-button switch status, and sends it to the lighting controller.

[0108] Sensor Data Processing (S): The sensor data processing module is responsible for collecting data from the photosensitive sensor and the thermal sensor and providing it to the lighting controller.

[0109] Power / Network Management (PM): Feeds back power status to the lighting controller; sends network management information to the CAN bus to interact with the main controller for network management.

[0110] CAN bus communication (CAN): Responsible for communication and information exchange with the main controller, receiving commands from the main controller and feeding back the status and fault information of the lighting controller.

[0111] Infineon TLD7002 Light Board (TLD7002): Receives control signals from the lighting controller via UARTCAN interaction and returns the status and fault information of the lighting fixtures to the lighting controller.

[0112] Main Controller: Sends control commands to the lighting controller via the CAN bus; receives status and fault information from the lighting controller via the CAN bus.

[0113] This embodiment demonstrates the workflow of an automotive lighting controller in normal operating mode, including sensor data processing, control logic implementation, power / network management, CAN bus communication, peripheral light board control, and sleep / wake-up control.

[0114] In an embodiment of the combined lamp driver hardware of a lighting drive control system based on a 48V system, such as Figure 5-9 As shown.

[0115] The system's 12V power module uses the JWQ6346A power management chip from the JWAT brand. This chip has a wide input voltage range, from 6V to 75V, and can reach 5V to 100V without an external VCC. It offers comprehensive protection, including thermal protection, short-circuit protection, overcurrent protection, and VCC undervoltage protection. Furthermore, the chip uses voltage-mode control to provide low output voltage, high current, high efficiency, excellent transient response, and high DC output accuracy, meeting the power requirements of a 48V system.

[0116] The internal system's 5V power module uses the Lingxin LN232435AQ1CHR power chip, which features an integrated hardware watchdog in the LDO, ensuring stable system operation and enhancing security.

[0117] The sensor power supply uses the ICW1238C50T6GQ1 power chip from AIC Microelectronics. This chip has a maximum drive capability of 500mA and strong self-protection and protection against external interference.

[0118] In the system information acquisition module, the switch input and output uses the TCIB04A-T5A1 chip from Taisiwei, which plays a role in signal transmission and buffering in the lighting control system, increases the driving capability of IO, and helps to improve the stability and reliability of the system.

[0119] The analog input uses the Runshi RS2260XTSS16-Q1 chip to expand the MCU's analog input I / O ports. It is a high-performance, high-reliability analog switch chip.

[0120] The central processing unit (CPU) uses the Z20K146MCMLLT chip, whose core is based on the ARM Cortex M4F architecture, with a main frequency of up to 160 MHz. It has 2M PFLASH and 128K DFLASH, as well as 8 CANFD and 6 UART / LIN interfaces, meeting the ASIL-B standard. Its performance in all aspects meets the design requirements of this product.

[0121] The communication section is mainly divided into the vehicle body CAN communication and the load lighting UART-to-CAN communication section. The vehicle body CAN communication uses the 3PEAK TPT1043Q chip, which features standby mode, ultra-low current sleep mode, and local and remote bus wake-up functions, allowing control of the product's static power consumption. The load lighting UART-to-CAN communication uses the TPT1042Q chip, which is powerful, easy to operate, and meets product development requirements.

[0122] The execution module can be divided into four parts: high-side drive section, stepper motor drive section, constant voltage output section, and constant current drive section.

[0123] The high-side drive section uses the Winsun Microelectronics WSD7025AD chip, which operates within a voltage range of 4.5-28V, has a maximum power supply voltage of 35V, an on-resistance RDS(ON) of 23mΩ, and a standby current of less than 1.0μA. It features comprehensive protection and diagnostic functions, including overheat shutdown protection, dynamic over-temperature protection, and load overcurrent protection. Furthermore, it provides high-precision proportional load current detection to ensure stable system operation.

[0124] The stepper motor drive section uses the Naxin Microelectronics NSD8381-Q1QANR chip, a highly integrated two-phase bipolar stepper motor driver that supports a maximum full-scale current of 1.35A. It includes current chopping regulation, an internal micro-step converter up to 1 / 32" and multiple attenuation modes to ensure smooth stepper motor movement. It features bus undervoltage protection (VSUV), overcurrent protection (OCP), temperature alarm (OTW / UTW), and over-temperature protection (OTSD). It also supports open-circuit diagnostics and overcurrent protection for the output load, as well as stall detection.

[0125] The constant voltage output uses the IND87682 chip from INDIMIC, a dual-channel peak current mode controller with an SPI interface. It can operate in both constant current and constant voltage modes, making it suitable for various topologies. In this embodiment, the constant voltage output circuit utilizes its constant voltage mode. It features a wide input voltage range, spread spectrum modulation to optimize EMC, high current regulation accuracy, and supports PWM dimming drive. Furthermore, it includes multiple protection functions, such as overvoltage, undervoltage, overcurrent, and undercurrent detection.

[0126] The constant current output uses the INDIMIC IND87520, which features a wide input voltage range of 4.5V to 65V, a constant current output of up to 1.6A, and employs an adaptive constant on-time control method, exhibiting excellent dynamic transient response. It provides 10-bit duty cycle and 3-bit frequency control, supports programmable switching frequency, output current, and PWM dimming, as well as fault monitoring.

[0127] Software program architecture:

[0128] The program architecture of an automotive lighting controller based on C language and microcontroller can be divided into several main modules: initialization module, sensor data processing module, control logic module, power management module, network communication module (such as CAN bus), sleep-wake control module, fault diagnosis module, and main control loop.

[0129] Initialization module: Initializes all basic modules, including power enable, high-speed drive chip enable, CAN chip enable, and initialization of all chip peripherals. After initialization is complete, the lighting controller starts working.

[0130] Sensor data processing module: The light intensity and temperature are converted into resistance values ​​by photosensitive and thermal sensors, and then converted into voltage signals by a voltage divider circuit and sent to the MCU. Finally, the MCU obtains the current voltage through the ADC, and converts it into the light intensity and temperature at this time. After that, the lighting controller performs logical processing on the sensor signal data fed back by each lamp to protect the normal operation of the lamp.

[0131] Network communication module: Communicates with each vehicle controller via CAN bus network, with a baud rate of 500k, and has busoff recovery capabilities.

[0132] Control logic module: Receives commands from the upper-level controller via CAN network to control the switching of relevant lights, including low beam headlights, high beam headlights, turn signals, daytime running lights, position lights, etc.; and reports the current controller status, such as light malfunctions and light switch status, to the upper-level controller.

[0133] Power management module: It collects voltage through ADC, analyzes the power supply voltage, performs logical judgments, and distinguishes between high voltage, low voltage, and normal operating voltage to protect the controller and lighting fixtures.

[0134] Sleep wake-up control: When the host computer issues a sleep command or the current state meets the sleep condition, the lighting controller enters a low-power mode to reduce the overall vehicle sleep power consumption.

[0135] TLD7002 LED Board Communication Module: Through the UART peripheral module, instructions are communicated with the TLD7002 LED board via the 1042CAN chip to control each LED in each channel of the LED board; and the LED board feeds back the load status to the MCU, which performs logic processing.

[0136] Module Logic Explanation:

[0137] AD data acquisition program design:

[0138] Configure the pin of the Z20K146 chip for AD acquisition to ADC mode and select the corresponding ADC channel for the pin. After initialization, the chip will automatically acquire AD values ​​according to the crystal oscillator frequency and automatically average the AD values ​​by 8 and store them in the designated register. In order to save resources, this controller uses the RS2260AD acquisition chip to convert 8-channel AD acquisition into single-channel AD acquisition. The corresponding acquisition channel is selected through the chip select pin, which saves MCU resources and ensures the stability of AD acquisition.

[0139] Keypad data acquisition design:

[0140] Key scanning seems simple, but different debouncing methods have a significant impact on the user's experience. A conventional method is time-debounce, which detects the duration of the key level. However, this method consumes a lot of CPU time and processes, severely wasting resources. Hardware debouncing is another option, but both methods have drawbacks. This controller uses a state machine approach combined with MCU scheduling to achieve highly reliable key recognition while conserving resources. When the current key level is valid, the latest level state is recorded. After one filtering time, the level state is updated. If it is still valid, the state is updated, and the success count is incremented. Otherwise, the failure count is updated, and the success count is decremented. The success count is compared with the configured filtering count. When the success count equals the configured count, the key is considered valid.

[0141] CAN network communication design:

[0142] Queue design and implementation

[0143] In the CAN network module, we designed two queues: one for receiving (receive queue) and the other for sending (transmit queue). This design allows us to effectively manage the inflow and outflow of CAN frames, thereby improving the system's responsiveness and reliability, and ensuring that no frames are lost or that program delays occur.

[0144] Receive Queue: This queue stores CAN frames received from the CAN network. When the CAN controller receives a frame, it is placed into the receive queue. This queue can be configured as a fixed-length array, managed by two pointers (read pointer and write pointer) for data input and output.

[0145] Transmit Queue: This queue stores CAN frames to be sent to the CAN network. The application or upper-layer protocol places frames to be sent into the transmit queue. The transmit queue helps buffer data to be sent, especially under high load conditions, preventing data loss and ensuring data is sent in the correct order.

[0146] Function implementation for queue operations:

[0147] Data enqueue and dequeue operations: For the receive queue, when the CAN controller receives a new CAN frame, we write the data into the receive queue using the `canloopBuffRead` function. For the transmit queue, we retrieve data from the transmit queue and send it to the CAN network using the `canloopBuffWrite` function.

[0148] Queue status check: We need to periodically check the queue status to ensure they are not overflowing or full before sending. This software achieves this by checking the queue length and current queue usage.

[0149] Synchronization and Mutual Exclusion of Queues

[0150] Because the CAN network module may be accessed simultaneously by multiple tasks or interrupt service routines, it is necessary to ensure that access to the queue is synchronous and mutually exclusive. This can be achieved by using mutex locks or disabling interrupts to prevent data corruption during writing or reading.

[0151] As described above, we can see that using two queues to manage CAN network communication is an effective method. It can not only improve the efficiency, stability and reliability of the system, but also reduce the risk of frame loss.

[0152] Fault diagnosis mechanism:

[0153] The lighting controller employs multiple fault diagnosis methods, including power fault diagnosis, communication diagnosis, sensor diagnosis, and light board feedback diagnosis.

[0154] Power supply fault diagnosis: The power supply voltage is determined by AD acquisition and divided into different steps for diagnosis, as shown in the table below;

[0155] This method controls the load's operation under normal voltage, thus protecting the load.

[0156] Communication diagnostics: When a bus error occurs in the CAN module of the Zhixin K146 chip, such as a busoff error, it will enter an error interrupt. When the software interrupts this, it will attempt to restart the CAN function until the CAN returns to normal.

[0157] Sensor diagnostics: The photosensitive sensor and the thermal sensor convert brightness and temperature into AD values. The data is continuously collected through the AD acquisition function. The software calculates the resistance values ​​of the photosensitive sensor and the thermal sensor through the external voltage divider resistor, thereby calculating the temperature and brightness at each sensor and performing fault logic judgment.

[0158] Light board feedback diagnosis: Infineon's TLD7002 light board has a diagnostic function. When an open circuit or short circuit fault occurs in the LED on the peripheral light board, the TLD7002 will report the fault to the lighting controller. The lighting controller will process the fault and report it to the higher-level controller.

[0159]

[0160] Figure 10 This is a block diagram of an electronic device structure for a lighting drive control method based on a 48V system, provided by one or more embodiments of the present invention.

[0161] like Figure 10 As shown, this application provides an electronic device, including: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

[0162] The memory stores a computer program that, when executed by the processor, causes the processor to perform steps of a lighting drive control method based on a 48V system.

[0163] This application also provides a computer-readable storage medium storing a computer program executable by an electronic device, which, when run on the electronic device, causes the electronic device to perform the steps of a lighting drive control method based on a 48V system.

[0164] For the sake of simplicity, the method embodiments are described as a series of actions. However, those skilled in the art should understand that the embodiments of the present invention are not limited to the described order of actions, because according to the embodiments of the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions involved are not necessarily essential to the embodiments of the present invention.

[0165] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0166] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lighting drive control system based on a 48V system, characterized in that, include: Power supply module, information acquisition module, central processing module, communication module, and execution module; The power module is used to step down the 48V voltage input from the vehicle to obtain a preset voltage. The information acquisition module is used to receive vehicle lighting control commands, collect the working status of the controlled lights and the operating status data of the module assembly itself; The central processing module is used to send drive control commands to the execution module to process the data collected by the information acquisition module, and to realize information interaction with the whole vehicle and the load lights through the communication module. The communication module includes a vehicle body CAN communication unit and a load lamp communication unit, which are used to realize command transmission with the whole vehicle, status feedback and communication adaptation with the load lamps. The execution module is used to provide power supply and drive control to the external load lamps according to the instructions of the central processing module.

2. The lighting drive control system based on a 48V system according to claim 1, characterized in that, The power module includes: a 12V power supply unit and a 5V power supply unit; The 12V power supply unit is used to convert 48V voltage into 12V voltage; The 5V power supply unit is used to provide a stable power supply for the logic components.

3. The lighting drive control system based on a 48V system according to claim 1, characterized in that, The information acquisition module includes: a digital input / output unit, an analog input unit, and a sensor data acquisition unit; The digital input / output unit is used for signal transmission and buffering, improving IO driving capability; The analog input unit is used to expand the analog input interface of the MCU; The sensor data acquisition unit is used to acquire brightness data from the photosensitive sensor and temperature data from the thermal sensor, and convert them into voltage signals to be fed back to the central processing module.

4. A lighting drive control system based on a 48V system according to claim 1, characterized in that, It also includes a fault diagnosis module; The fault diagnosis module is configured to perform power fault diagnosis, communication fault diagnosis, sensor fault diagnosis, and light board feedback diagnosis. The power supply fault diagnosis method collects the power supply voltage and judges the high voltage state, normal state, low voltage state and reset state according to the preset voltage steps, and restricts the operation of the corresponding load under the high voltage or low voltage state. The communication fault diagnosis configuration is to automatically restart the CAN function until it returns to normal when a busoff error occurs on the CAN bus; The sensor fault diagnosis achieves fault logic judgment by analyzing the voltage signal converted by the sensor and calculating the corresponding resistance value, temperature value and brightness value. The lamp board feedback diagnostic configuration is to receive open circuit and short circuit fault information reported by the load lamp board and feed it back to the vehicle through the communication module.

5. A lighting drive control system based on a 48V system according to claim 1, characterized in that, The execution module includes: High-side drive unit, stepper motor drive unit, constant voltage output unit, and constant current drive unit; The high-side drive unit is used to implement load switching control and overcurrent and overheat protection; The stepper motor drive unit is used to adjust the illumination angle of the lamp and supports micro-step switching function; The constant voltage output unit achieves constant voltage output and PWM dimming via the SPI interface; The constant current drive unit is used to provide a constant current drive output for the load under a wide voltage input range.

6. A lighting drive control system based on a 48V system according to claim 1, characterized in that, The central processing module is configured with a key acquisition debounce algorithm; The key acquisition debouncing algorithm adopts a state machine method, which records the level state, counts the effective number of times, and compares it with the preset filtering number of times.

7. A lighting drive control system based on a 48V system according to claim 1, characterized in that, The communication module's CAN bus communication is configured with a receive queue and a transmit queue; Data entry and exit are managed using two pointers, and synchronization and mutual exclusion of multi-task access are achieved by combining mutex locks.

8. A lighting drive control method based on a 48V system, characterized in that, Includes the following steps: Hybrid power supply adaptation steps: Receive the 48V bus voltage of the whole vehicle, generate low-voltage power supply for the logic control components and medium-voltage power supply for the drive circuit through voltage conversion, and selectively retain the 48V voltage to directly power high-voltage loads, forming a multi-voltage level hybrid power supply mode. Multi-source data acquisition steps: Acquire control data and transmit it to the control core, including lighting control commands issued by the vehicle, working status feedback data of the controlled lights, and the self-operating status data of the control system, which includes power status data and environmental perception data; Data parsing and instruction generation steps: The control core parses and processes the collected control data, and generates corresponding drive control instructions according to the preset control strategy. The drive control instructions are used to realize the switching on and off of lights, parameter adjustment or dynamic effect control. Two-way communication adaptation steps: The system transmits commands and provides status feedback to the vehicle via the vehicle standard bus, and at the same time, it converts communication protocols to achieve compatible communication with different types of load lights, ensuring two-way interaction between command issuance and status feedback. Load drive execution steps: In response to the drive control command, provide appropriate power supply and drive control to the external load lamp to realize the preset lighting function or dynamic lighting effect.

9. An electronic device, characterized in that, include: The processor, communication interface, memory, and communication bus are connected, with the processor, communication interface, and memory communicating with each other via the communication bus. The memory stores a computer program, which, when executed by the processor, causes the processor to perform the steps of the lighting drive control method based on a 48V system as described in claim 8.

10. A computer-readable storage medium, characterized in that, It stores a computer program that can be executed by an electronic device. When the computer program is run on the electronic device, it causes the electronic device to perform the steps of the lighting drive control method based on a 48V system as described in claim 8.

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