Steering lamp control system
By connecting the body control module and the lighting drive module in a dual-loop manner and implementing closed-loop monitoring, the safety issues of turn signals in malfunction situations are resolved, ensuring that the turn signals can reliably enter a functional safety state after a vehicle collision, thereby improving vehicle safety.
Patent Information
- Application Number
- CN202520049710.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-01-09
AI Technical Summary
The existing turn signal control system cannot ensure that the turn signal enters a functional safety state when there is a communication failure between the LDM and the light panel. Especially when the hard wire signal fails or the CAN communication is interrupted, it cannot effectively act as a hazard warning light. The lack of redundancy design results in insufficient safety protection after a collision.
Design a turn signal control system that employs a dual connection between the body control module and the lighting drive module. Through CAN bus and hard-wired signal redundancy design, combined with a closed-loop monitoring mechanism, ensure that the turn signal can still maintain the alarm function in the event of external wiring harness or internal faults.
This technology enables the turn signals to reliably enter a functional safety state after a vehicle collision, improving vehicle safety and ensuring that the turn signals can effectively function as an alarm in various fault scenarios.
Smart Images
Figure CN223720775U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to light control system technical field especially relates to a kind of turn signal control system. BACKGROUND
[0002] Current turn signal control method usually relies on CAN (Controller Area Network) message or hard-wire signal to realize the switch control of turn signal, but these systems lack redundancy design. When LDM (LED Driver Module) and vehicle body domain control occur faults such as bus offline, turn signal usually enters functional safety state, that is, keeps off. This design cannot ensure that turn signal is in safe state when communication between LDM and lamp panel fails, resulting in LDM losing control of lamp panel.
[0003] Prior art cannot ensure that turn signal can effectively act as danger warning light after vehicle collision, especially in the case of hard-wire signal failure or CAN communication interruption. After collision, UART communication between LDM and lamp panel fails, and existing system cannot ensure that turn signal enters a certain safe state. These deficiencies make existing turn signal control system unable to provide sufficient safety guarantee in emergency.
[0004] Therefore, it is necessary to design a new system to ensure that turn signal can maintain warning function and enter functional safety state after collision regardless of external wiring harness or internal failure of lamp, thereby improving vehicle safety. SUMMARY
[0005] The utility model aims at overcoming the defects of prior art, and provides a kind of turn signal control system.
[0006] To solve the above technical problems, the utility model aims at realizing by the following technical scheme: provide a kind of turn signal control system, include: vehicle body control module and light driving module, the vehicle body control module is connected with car lamp using CAN bus and hard-wire;The vehicle body control module is connected with the light driving module;The light driving module is connected with car lamp.
[0007] Further technical scheme thereof is: the light driving module includes micro control unit, constant voltage module, second linear voltage regulator, first linear chip and first UART CAN transceiver;The constant voltage module, the second linear voltage regulator, the first linear chip and the first UART CAN transceiver are connected with the micro control unit respectively;The first UART CAN transceiver is connected with the car lamp.
[0008] A further technical scheme of the present application is that the light driving module further comprises an electrostatic discharge protection module, the electrostatic discharge protection module is connected with the vehicle body control module, and the electrostatic discharge protection module is connected with the constant voltage module.
[0009] A further technical scheme of the present application is that the light driving module further comprises an ADC module and a first linear voltage regulator integrated with a watchdog, the ADC module is connected with the vehicle body control module and the first linear voltage regulator respectively, and the first linear voltage regulator is connected with the micro control unit.
[0010] A further technical scheme of the present application is that the light driving module further comprises a CAN transceiver, the CAN transceiver is connected with the vehicle body control module and the micro control unit respectively.
[0011] A further technical scheme of the present application is that the vehicle lamp further comprises a lamp panel, the lamp panel comprises the headlamp and the tail lamp, and the headlamp and the tail lamp are connected with the vehicle body control module through the CAN bus.
[0012] A further technical scheme of the present application is that the lamp panel further comprises a left turn signal lamp and a right turn signal lamp, and the left turn signal lamp and the right turn signal lamp are connected with the vehicle body control module through hardwires.
[0013] A further technical scheme of the present application is that the vehicle lamp further comprises a linear chip, and the linear chip is connected with the first UART CAN transceiver through a second UART CAN transceiver.
[0014] A further technical scheme of the present application is that the linear chip is connected with the lamp panel.
[0015] The present application has the following beneficial effects compared with the prior art: the present application realizes the software and hardware redundancy design through the connection of the vehicle body control module and the light driving module; the vehicle body control module and the vehicle lamp are connected through the CAN bus and hardwires at the same time, so that the function of the turn signal lamp can be maintained through another signal channel in the case that the external wiring harness is damaged; the light driving module is directly connected with the vehicle lamp, and the state of the wiring harness and the lamp can be monitored in real time, so that the system can enter the function safety state when internal faults occur; the redundancy design and the closed-loop control in the system ensure that the turn signal lamp can still play the role of warning even if the vehicle body and the external wiring are damaged; finally, the system improves the safety of the vehicle after the collision through these measures.
[0016] The present application will be further described below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings described in the following are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.
[0018] Figure 1 A schematic block diagram of a steering lamp control system provided by the present application is shown in the figure.
[0019] Figure 2 A specific structure block diagram of a steering lamp control system of the present application is shown in the figure.
[0020] Explanation of the figure:
[0021] 10, vehicle body control module; 20, light driving module; 21, micro control unit; 22, constant voltage module; 23, second linear voltage regulator; 24, first UART CAN transceiver; 25, electrostatic discharge protection module; 26, ADC module; 27, first linear voltage regulator; 28, CAN transceiver; 30, vehicle lamp; 31, linear chip; 32, second UART CAN transceiver; 33, lamp panel. DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.
[0023] It should be understood that the terms "include" and "contain" as used in the specification and the appended claims indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or sets thereof.
[0024] It should also be understood that the terms used in the present application specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the present application specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.
[0025] It should be further understood that the term "and / or" used in the description and claims of the present utility model means any combination of one or more of the associated listed terms and all possible combinations, and includes these combinations.
[0026] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the description of the drawings and specific embodiments.
[0027] Please refer to Figure 1 , Figure 1 A schematic block diagram of a turn signal control system according to an embodiment of the present utility model is provided, which can be applied in the vehicle lamp control process to ensure that the turn signal can maintain the warning function and enter the functional safety state after a collision, regardless of external wiring or internal lamp failure, thereby improving vehicle safety.
[0028] Please refer to Figure 1 The above-mentioned turn signal control system comprises a vehicle body control module and a light driving module, the vehicle body control module is connected with the vehicle lamp through CAN bus and hardwire; the vehicle body control module is connected with the light driving module; and the light driving module is connected with the vehicle lamp.
[0029] The vehicle body control module and the vehicle lamp are not only connected through CAN bus for transmitting complex data signals, but also retain the traditional hardwire connection as a direct communication path on the physical level, ensuring that the basic turn signal control function can be maintained even in extreme cases. In addition, the vehicle body control module and the light driving module are also directly connected, responsible for transmitting control instructions and state feedback, and the light driving module is directly connected with the vehicle lamp to receive instructions from the vehicle body control module and drive the vehicle lamp to work according to the predetermined logic.
[0030] The system of the present embodiment emphasizes its redundancy design and closed-loop monitoring characteristics. Specifically, at the hardware level, both hardwire signals and CAN signals are used to provide double protection for turn signal control, so that even if a collision causes the external wiring (whether hardwire or CAN communication line) to fail individually or completely, the turn signal can still maintain the warning function and continue to convey the status of the vehicle to surrounding traffic participants. At the software level, a linear chip and output back-read closed-loop design are adopted to realize real-time monitoring of the running state of the internal hardware modules of the light driving module. This design allows the system to respond quickly when detecting internal lamp failure, so that the turn signal automatically enters the preset functional safety state, thereby ensuring that the safety of the vehicle can be maintained to the greatest extent even after a collision.
[0031] In summary, the turn signal control system of the embodiment realizes real-time monitoring of the external wire harness state and the LDM internal hardware module through the redundancy mechanism and closed-loop monitoring, ensures that the turn signal can reliably play the warning function in various possible fault scenarios, and further improves the overall safety level of the vehicle.
[0032] Please refer to Figure 1 The explanations of the names in the figure are as follows:
[0033] BCM: Body Control Module
[0034] LDM_FL / FR / RL / RR: Left front / right front / left rear / right rear light driving module
[0035] TI_L_EN: Left turn light enable signal, controlled by the high-side module in the BCM, high level effective
[0036] TI_R_EN: Right turn light enable signal, controlled by the high-side module in the BCM, high level effective
[0037] BCAN 1: CAN bus between BCM and headlight
[0038] BCAN 2: CAN bus between BCM and tail light
[0039] The signal description in the figure is shown in Table 1.
[0040] Table 1. Signal description
[0041]
[0042]
[0043] Among them, the hard-wired signal is mainly the left / right turn signal + signal, which is a high-effective hard-wired signal, and is high-low level switching in normal operation to control the turn signal on / off;
[0044] The CAN signal refers to the turn signal lighting signal, and the period signal, and the hard-wired normal working value is 0x0:Initial / 0x3:Invalid(invalid value), and the vehicle collision value is 0x1:Off / 0x2:On(valid value). The CAN signal control synchronously sends the turn signal lighting signal to the LDM_FL / FR / RL / RR, ensuring the synchronization of the front and rear turn signals.
[0045] In an embodiment, please refer to Figure 2The light driving module comprises a micro control unit, a constant voltage module, a second linear voltage stabilizer and a first UART CAN transceiver; the constant voltage module, the second linear voltage stabilizer and the first UART CAN transceiver are connected with the micro control unit respectively; the first UART CAN transceiver is connected with the vehicle lamp.
[0046] In an embodiment, referring to Figure 2 The light driving module further comprises an electrostatic discharge protection module, which is connected with the body control module; the electrostatic discharge protection module is connected with the constant voltage module.
[0047] In an embodiment, referring to Figure 2 The light driving module further comprises an ADC module and a first linear voltage stabilizer with an integrated watchdog; the ADC module is connected with the body control module and the first linear voltage stabilizer respectively; the first linear voltage stabilizer is connected with the micro control unit.
[0048] In an embodiment, referring to Figure 2 The light driving module further comprises a CAN transceiver, which is connected with the body control module and the micro control unit respectively.
[0049] In an embodiment, referring to Figure 2 The vehicle lamp further comprises a lamp panel, which comprises a headlamp and a tail lamp; the headlamp and the tail lamp are connected with the body control module through a CAN bus.
[0050] In an embodiment, referring to Figure 2 The lamp panel further comprises a left turn signal lamp and a right turn signal lamp; the left turn signal lamp and the right turn signal lamp are connected with the body control module through a hard wire.
[0051] In an embodiment, referring to Figure 2 The vehicle lamp further comprises a linear chip, which is connected with the first UART CAN transceiver through a second UART CAN transceiver.
[0052] In an embodiment, referring to Figure 2 The linear chip is connected with the lamp panel.
[0053] In this embodiment, the micro control unit (MCU) is the core controller of the entire light driving module, responsible for coordinating and managing the operation of each sub-module. It receives instructions from the body control module (BCM) and controls the behavior of the turn signal lamp according to these instructions.
[0054] Constant Voltage Module (CV): This module provides a stable and constant voltage output for the light board, ensuring that the lamp receives the appropriate power supply under various conditions. Additionally, the CV module is equipped with an AD acquisition circuit, which feeds back voltage information to the MCU for real-time monitoring and adjustment.
[0055] Second Linear Regulator (LDO2): This module provides power to the CAN transceiver and UART CAN transceiver, ensuring the stability and reliability of the communication interface. The 5V voltage provided by LDO2 is a key factor in maintaining normal data exchange.
[0056] Linear Chip: This chip not only provides the necessary 5V power support for the UART CAN transceiver on the light board but also outputs stable current to precisely control LED brightness. More importantly, it can monitor the status of each output channel and quickly respond to abnormal conditions such as open or short circuit faults, entering a pre-set functional safety state to ensure the overall safety of the system.
[0057] First UART CAN Transceiver: This transceiver uses the UART protocol to enable efficient communication between the MCU and the linear chip on the light board. Through this method, control commands and status information can be effectively transmitted while maintaining low latency and high accuracy.
[0058] ESD Protection Module: Deployed at the input end of the light drive module, this module protects internal circuits from external electrostatic discharge while also providing anti-reverse connection and filtering functions to ensure the stability of the input power supply.
[0059] ADC Module: This module is responsible for converting analog signals from the BCM into digital signals, which are then transmitted to the MCU for processing. This step is crucial for accurately interpreting the vehicle's steering intentions.
[0060] First Linear Regulator with Watchdog (LDO1 & Watchdog): This module supplies a constant 5V voltage to the MCU, while the built-in watchdog timer can automatically restart the system in the event of temporary MCU failure, restoring normal operation.
[0061] CAN Transceiver: As a communication bridge between the light drive module and the vehicle control module, the CAN transceiver receives and sends data packets based on the CAN protocol, making information exchange between the two more convenient and reliable.
[0062] Vehicle Lights: The vehicle lights include headlights, taillights, and left and right turn signals. The headlights and taillights are connected to the vehicle control module via the CAN bus, while the left and right turn signals use a hard-wired connection. This combination design ensures both speed and quality of data transmission, as well as enhancing the robustness of the system.
[0063] In summary, in this embodiment, the light driving module not only has comprehensive monitoring capability for internal hardware modules, but also effectively responds to external harness damage. Even in extreme situations such as vehicle collision, the turn signal light can be quickly switched to a safe mode, thereby minimizing potential risks and protecting the safety of passengers and other road users.
[0064] To ensure that the turn signal light can still maintain basic alarm functions when the vehicle collides, the above-mentioned system adopts hardware redundancy and real-time monitoring strategies, aiming to place the turn signal light in a relatively safe state even if the light driving module inside or external harness is damaged. The following is the behavior logic of the architecture after the collision and its detailed description:
[0065] Internal fault monitoring mechanism includes the following processes:
[0066] CV output monitoring: The MCU continuously monitors the output voltage of the constant voltage module (CV). Once the output deviates from the preset range, the functional safety state is triggered immediately, and the affected linear chip output is turned off to prevent potential safety hazards.
[0067] Linear chip channel fault detection: Through the UART CAN interface, the MCU regularly checks the status of each output channel of the linear chip. If an open or short circuit fault is found, the MCU will enter the functional safety mode and shut off all turn signal light outputs to avoid further damage.
[0068] MCU recoverable fault handling: The first linear voltage regulator (LDO1) integrated with the watchdog will automatically restart the MCU when a temporary fault of the MCU is detected, trying to restore normal operation.
[0069] Non-recoverable fault response: If the MCU fault cannot be repaired by itself, and the linear chip detects communication failure (such as Bus Off) between the light driving module and the lamp panel, the system will directly shut off the turn signal light according to the pre-defined functional safety scheme, ensuring system stability.
[0070] Communication fault handling: When the UART communication or E2E check between the light driving module and the lamp panel fails, the linear chip will act according to the pre-defined functional safety state, i.e., shutting off the turn signal light to ensure that no dangerous operation is triggered by mistake.
[0071] External fault and collision response logic includes how the light driving module maintains the basic function of the turn signal light after the collision, and the specific process is as follows:
[0072] Wake-up and initialization: The light driving module wakes up from hibernation and enters normal working state.
[0073] Hardwire signal monitoring: The light driving module constantly monitors the level changes of the
turn signal +
[0074] CAN bus communication status check: At the same time, the light driving module also continuously monitors the communication quality of the CAN bus to ensure the reliability of information transmission.
[0075] Hardwire signal change response: If the
turn signal +
[0076] CAN signal value judgment: If the hardwire signal does not change and the CAN communication is normal, the light driving module will evaluate the effectiveness of the turn signal lighting signal:
[0077] For invalid values (0x0 / 0x3), the light driving module will control the turn signal based on the hardwire signal.
[0078] For valid values (0x1 / 0x2), the light driving module will follow the CAN signal indication to control the turn signal flashing mode.
[0079] Fault handling logic: When the hardwire signal does not change for a long time and the CAN communication is abnormal, the light driving module will react based on the last valid turn signal lighting signal:
[0080] If the last signal is valid (0x1 / 0x2), the light driving module assumes that a collision has occurred, even if both CAN and hardwire are invalid, and will start double flash alarm (200ms On, 200ms Off), giving priority to warning effect.
[0081] If the last signal is invalid (0x0 / 0x3), the light driving module further analyzes the hardwire level state to decide whether to extinguish the turn signal.
[0082] Long high level processing: If the hardwire signal remains high for more than 1.5 seconds and is accompanied by CAN communication failure, the light driving module infers that no collision has occurred but there is other problem, and chooses to enter the functional safety state (extinguish the turn signal).
[0083] Long low level processing: For the case of continuous low level, considering the possible hardwire failure, the light driving module also chooses to extinguish the turn signal.
[0084] Sleep condition detection: The light driving module periodically checks the sleep conditions (such as network management message stop sending and KL15 power off). When the conditions are met, the light driving module will execute the sleep program and turn off the turn signal.
[0085] Continuous monitoring and adjustment: As long as the dormancy condition is not met, the light driving module will continue to run and dynamically adjust the working state of the turn signal to adapt to different environments and fault conditions.
[0086] In summary, the system of the embodiment not only strengthens the self-protection ability of the internal hardware, but also realizes that the turn signal can be quickly switched to the safety mode when facing potential collisions or other unexpected situations through the dual use of hard-wire signals and CAN signals, thereby effectively improving the driving safety.
[0087] The above-mentioned turn signal control system realizes hardware redundancy design through the connection of the body control module and the light driving module; the body control module and the vehicle lamp are connected through the CAN bus and the hard-wire at the same time, ensuring that the function of the turn signal can still be maintained through another signal channel in the case of damage to the external wiring harness; the light driving module is directly connected with the vehicle lamp and can monitor the state of the wiring harness and the lamp in real time, ensuring that the system can enter the function safety state when internal failure occurs; the redundancy design and closed-loop control in the system ensure that the turn signal can still play a warning role even if the body and the external line are damaged; finally, the system improves the safety of the vehicle after the collision through these measures.
[0088] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A turn signal control system characterized by, Include: The vehicle body control module and light drive module, the vehicle body control module and the car lamp use CAN bus and hard wire connection; The vehicle body control module is connected with the light drive module; The light drive module is connected with the car lamp.
2. A system according to claim 1, wherein The light drive module includes a micro control unit, a constant voltage module, a second linear voltage regulator and a first UART CAN transceiver; The constant voltage module, the second linear voltage regulator and the first UART CAN transceiver are connected with the micro control unit respectively; The first UART CAN transceiver is connected with the car lamp.
3. A system according to claim 2, wherein The light drive module further includes an electrostatic discharge protection module, which is connected with the vehicle body control module; The electrostatic discharge protection module is connected with the constant voltage module.
4. A system according to claim 3, wherein The light drive module further includes an ADC module and an integrated watchdog first linear voltage regulator, the ADC module is connected with the vehicle body control module and the first linear voltage regulator respectively; The first linear voltage regulator is connected with the micro control unit.
5. A system according to claim 4, wherein The light drive module further includes a CAN transceiver, which is connected with the vehicle body control module and the micro control unit respectively.
6. The turn signal control system of claim 2, wherein, The car lamp further includes a lamp panel, the lamp panel includes a headlamp, a tail lamp; The headlamp and the tail lamp are connected with the vehicle body control module through the CAN bus.
7. A system according to claim 6, wherein, The lamp panel further includes a left turn signal and a right turn signal, the left turn signal and the right turn signal are connected with the vehicle body control module through the hard wire.
8. A system according to claim 7, wherein, The car lamp further includes a linear chip, which is connected with the first UART CAN transceiver through a second UART CAN transceiver.
9. A system according to claim 8, wherein, The linear chip is connected with the lamp panel.