Fault diagnosis device and method for vehicle steering lamp, vehicle and computer readable storage medium

Abstract

The invention relates to the technical field of vehicles, and discloses a vehicle steering lamp fault diagnosis device and method, a vehicle and a computer readable storage medium. The fault diagnosis device comprises a plurality of steering lamps which are arranged in a matrix mode and comprise at least two columns and at least two rows, each column comprises at least two steering lamps, each column corresponds to the same steering side, and each row comprises at least two steering lamps; the vehicle control unit comprises a plurality of steering signal interfaces and a plurality of diagnostic signal interfaces; the plurality of steering signal interfaces are arranged corresponding to at least two columns of steering lamps, and each steering signal interface is connected to the control input end of the steering lamp of the corresponding column, so that the steering lamps of each column share the same steering signal; the plurality of diagnosis signal interfaces are arranged corresponding to the steering lamps in at least two rows, and each diagnosis signal interface is connected to the diagnosis feedback output end of each column of steering lamps in the corresponding row, so that the steering lamps in each row share the same diagnosis signal. In this way, the number of wire harnesses is reduced, and the diagnosis distinguishing precision of the steering lamp is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle turn signal fault diagnosis technology, such as a vehicle turn signal fault diagnosis device and method, a vehicle, and a computer-readable storage medium. Background Technology

[0002] With the development of vehicle electrification and intelligence, LED turn signals have become a mainstream configuration due to their advantages such as low power consumption and long lifespan. However, LED turn signals have low operating current and diverse fault modes, making traditional current-based diagnostic methods insufficient for accurate fault location. Therefore, the current approach often involves setting up an independent fault feedback line for each turn signal, with the controller collecting electrical signals through each feedback line for diagnosis. While this approach can achieve accurate fault location, it requires multiple I / O interfaces on the controller, resulting in numerous wiring harnesses and high costs.

[0003] In related technologies, turn signal fault diagnosis involves merging the feedback signals from the left front light and the left rear light within the light itself to output a single left-side feedback signal. As a result, the controller can only detect a fault on one side and cannot pinpoint the specific faulty light, leading to low maintenance efficiency.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0006] This disclosure provides a fault diagnosis device and method for vehicle turn signals, a vehicle, and a computer-readable storage medium to solve the technical problem of being unable to locate the specific faulty turn signal.

[0007] In some embodiments, a fault diagnosis device for vehicle turn signals is provided, comprising: a plurality of turn signals arranged in a matrix, including at least two columns and at least two rows, wherein each column includes at least two turn signals and each column corresponds to the same steering side, and each row includes at least two turn signals; a vehicle controller including a plurality of steering signal interfaces and a plurality of diagnostic signal interfaces; the plurality of steering signal interfaces are configured corresponding to at least two columns of turn signals, each steering signal interface being connected to the control input terminal of the turn signal in the corresponding column, so that each column of turn signals shares the same steering signal; the plurality of diagnostic signal interfaces are configured corresponding to at least two rows of turn signals, each diagnostic signal interface being connected to the diagnostic feedback output terminal of each column of turn signals in the corresponding row, so that each row of turn signals shares the same diagnostic signal.

[0008] This embodiment provides a fault diagnosis device for vehicle turn signals. Each column of turn signals corresponds to the same steering side and is controlled by the same turn signal interface, enabling synchronous triggering of turn signals on one side and ensuring consistency of turn signals. Each row of turn signals shares the same diagnostic signal interface, and the vehicle controller can obtain the working status of each column of turn signals within the same row in batches through the diagnostic interface. Compared to the solution of testing turn signals one by one, this significantly reduces the number of diagnostic signal interfaces and wiring complexity. At the same time, by combining row and column matrix positioning, the specific location of the faulty turn signal can be quickly located by determining the intersection of the faulty row and the corresponding steering side column, improving fault diagnosis efficiency and reducing maintenance costs. In this way, the matrix connection topology of sharing control signals by side and sharing diagnostic signals by position significantly reduces the length of the wiring harness and the number of connector terminals, reducing the overall vehicle wiring harness cost and layout complexity; it also reduces the occupation of controller pins, thus reducing the controller hardware cost.

[0009] Optionally, the vehicle controller is configured to: in response to a diagnostic request from the target steering side, output a steering control signal through a steering signal interface corresponding to the target steering side, and simultaneously output a diagnostic enable signal through multiple diagnostic signal interfaces.

[0010] In this embodiment, when the vehicle controller responds to a diagnostic request, it simultaneously outputs a steering control signal and a diagnostic enable signal. The controller only outputs control commands through the steering signal interface corresponding to the steering side, rather than driving all turn signals. The simultaneous output of diagnostic enable signals from multiple diagnostic signal interfaces allows turn signals in the same row to enter diagnostic mode at the same time, ensuring consistent fault detection conditions for each row of turn signals and eliminating deviations in detection results caused by differences in diagnostic timing.

[0011] Optionally, each turn signal integrates a diagnostic circuit for detecting its own operating status and a feedback circuit for outputting diagnostic results; wherein, the feedback circuit is configured to: for each turn signal, based on the operating status of the turn signal, control the level on the diagnostic signal interface connected to the turn signal; the operating status is determined based on the diagnostic circuit.

[0012] In this embodiment, by integrating diagnostic circuitry within the turn signals, localized detection of various fault modes, such as open circuits, short circuits, and partial LED failures, is achieved, improving diagnostic accuracy and response speed. By coupling the diagnostic feedback mechanism with the aforementioned shared diagnostic line architecture, the vehicle controller learns the health status of each turn signal by detecting the voltage levels on the diagnostic line, thus achieving superior diagnostic capabilities with simplified hardware.

[0013] Optionally, the feedback circuit is further configured to: adjust the diagnostic enable signal on the diagnostic signal interface connected to the targeted turn signal to a preset level when the operating state of the targeted turn signal is normal; and keep the level on the diagnostic signal interface connected to the targeted turn signal unchanged when the operating state of the targeted turn signal is faulty.

[0014] In this embodiment, if the diagnostic circuit determines that the turn signal is functioning normally, it adjusts the level signal on the diagnostic interface to a preset level, for example, by pulling the high-level signal on the diagnostic interface down to a low level. If the diagnostic circuit determines that the turn signal is malfunctioning, it keeps the level signal on the diagnostic interface unchanged. This simplifies the complex multiple fault states into a clear level signal adjustment, simplifying the diagnostic logic of the vehicle controller and reducing the computational requirements of the controller.

[0015] In some embodiments, a fault diagnosis method for a vehicle turn signal is provided, applied to a fault diagnosis device for a vehicle turn signal as described in any of the above embodiments, the diagnosis method comprising: In response to a turn signal activation request, determine the target steering side corresponding to the turn signal activation request; A steering control signal is output to at least one turn signal on the target steering side via a steering signal interface corresponding to the target steering side; Diagnostic enable signals are output through multiple diagnostic signal interfaces to enable diagnostics for each turn signal on the target steering side, and to determine the level signals connected to the multiple diagnostic signal interfaces. Within the preset diagnostic feedback time period, the level signals on each diagnostic signal interface are collected; Based on the collected level signals, the working status of each turn signal on the target steering side is determined, including normal status or fault status.

[0016] The vehicle turn signal fault diagnosis method provided in this disclosure locks onto the target turning side based on the turn signal activation request, driving only the corresponding turn signal to operate, thus avoiding invalid triggering of lights on non-target turning sides. Simultaneously, a diagnostic enable signal is output, allowing the target turning side turn signal to initiate diagnosis in its actual operating state. This combination of directional driving and synchronous diagnosis avoids interference with non-diagnostic sides and improves the targeting of fault detection. The turn signal operating status is determined by acquiring the level signal from the diagnostic signal interface, converting the hardware operating status into intuitive electrical signal parameters, avoiding subjective judgment errors. Changes in the level signal directly reflect problems such as turn signal on / off states and abnormal loads. Compared to indirect detection methods, the diagnostic results are more accurate and facilitate rapid identification and processing by the vehicle controller.

[0017] Furthermore, by acquiring level signals within a preset diagnostic feedback time period, system resource consumption due to excessively long acquisition times and signal omissions due to excessively short acquisition times are avoided. The standardized time window makes the diagnostic process more controllable, improves the consistency of diagnostic results under different operating conditions, and enhances the stability of the diagnostic process.

[0018] The diagnostic method disclosed herein, combined with matrix turn signals, configures the diagnostic signal interface by row and the turn signal interface by column. By cross-locating the diagnostic interface corresponding to the abnormal level signal with the turn signal interface, the specific location of the faulty turn signal can be quickly pinpointed, eliminating the need to check each signal individually, significantly improving fault location efficiency and reducing subsequent maintenance costs.

[0019] Optionally, the steps for activating diagnostics on each turn signal on the target steering side include: detecting the operating parameters of the turn signal; adjusting the diagnostic enable signal connected to the diagnostic signal interface to a preset level via a feedback circuit if the operating parameters meet the normal conditions of the turn signal; and maintaining the level of the diagnostic enable signal connected to the diagnostic signal interface unchanged via the feedback circuit if the operating parameters do not meet the normal conditions of the turn signal.

[0020] This embodiment defines the operating principle of the internal diagnostic circuit of the turn signal. Specifically, by detecting the operating parameters at the lamp end and comparing them with the normal conditions of the turn signal, different fault types such as open circuit, short circuit, and partial LED failure are diagnosed. Furthermore, by setting reasonable normal conditions for the turn signal, it can adapt to parameter drift caused by normal aging of LED chips, avoiding false alarms of performance degradation as faults. Further, the threshold comparison logic is embedded at the lamp end, and the vehicle controller only needs to process the final level result, realizing the distributed deployment of diagnostic tasks and reducing the load on the central controller.

[0021] Optionally, the step of acquiring the level signal on each of the diagnostic signal interfaces within a preset diagnostic feedback time period includes: determining a signal acquisition phase; and within the signal acquisition phase, sampling the level signal on each of the diagnostic signal interfaces at least once according to a preset sampling period.

[0022] In this embodiment, a timing control mechanism involving delay and at least one sampling is introduced. By setting a preset delay time, the vehicle controller only begins sampling after the turn signal has completed its internal diagnostics and output a stable feedback level, avoiding misreading as a fault due to premature sampling. The "at least one" sampling mechanism, by performing at least one level reading within a diagnostic cycle, effectively filters out instantaneous level fluctuations caused by factors such as electromagnetic interference and poor wiring harness contact, significantly improving the robustness of the diagnostic system.

[0023] Optionally, the step of determining the working status of each turn signal on the target steering side based on the collected level signal includes: for each diagnostic signal interface, if there is a signal level change in at least one sampling, the working status of the turn signal corresponding to the diagnostic signal interface is determined to be normal; if the signal level remains unchanged in at least one sampling, the working status of the turn signal corresponding to the diagnostic signal interface is determined to be faulty.

[0024] In this embodiment, the light is considered normal if at least one signal level change is captured in at least one sampling. Thus, even in the complex electromagnetic environment of an vehicle, if a low level is incorrectly read as a high level in a single sampling due to transient interference, the system can still make a correct judgment as long as a low level is successfully captured in the remaining samplings. Compared to schemes that require only one sampling or all samplings to be low, this rule effectively reduces unnecessary repairs caused by false alarms during after-sales maintenance while maintaining diagnostic accuracy.

[0025] Optionally, the diagnostic method further includes: if it is determined that the working state of the turn signal on the target steering side is faulty, then perform at least one of the following processing methods: control the turn signal on the faulty side to flash at a preset frequency; or, send a turn signal fault signal to the vehicle's intelligent driving controller.

[0026] In this embodiment, if the turn signal on the target turning side is determined to be faulty, at least one of the following processing methods is executed: One processing method is to control the turn signal on the faulty side to operate in a rapid flashing mode to warn the driver, reminding the driver to pay attention to the turn signal malfunction and to repair it in time. Another processing method is to send a fault signal to the intelligent driving controller, realizing cross-domain collaboration between vehicle control and intelligent driving. When the intelligent driving system plans an automatic lane change, if it receives a turn signal malfunction signal, it can actively stop the lane change operation or issue a takeover request to the driver, thereby avoiding traffic accidents caused by the lack of turn signals.

[0027] In some embodiments, a vehicle is provided, including: a vehicle body; and a vehicle turn signal fault diagnosis device as described in any of the above embodiments, mounted on the vehicle body.

[0028] In some embodiments, a computer-readable storage medium is provided storing program instructions that, when executed, cause a computer to perform a vehicle turn signal fault diagnosis method as described in any of the above embodiments.

[0029] The vehicle turn signal fault diagnosis device and method, vehicle, and computer-readable storage medium provided in this disclosure can achieve the following technical effects: (1) This invention enables the control and diagnostic functions of the turn signals of the entire vehicle through a matrix connection architecture that shares control signals by side and diagnostic signals by position, significantly reducing the number of wiring harnesses and controller interfaces. The parallel design of the diagnostic lines reduces the number of wiring harness branch nodes and wire diameter, making the overall wiring harness layout simpler and reducing the complexity of the overall wiring harness layout.

[0030] (2) By controlling the timing of the output of the diagnostic preset level signal, time-sharing diagnosis and feedback of multiple turn signals on the same diagnostic line can be realized.

[0031] (3) By integrating diagnostic circuits inside the turn signals, localized detection of various fault modes such as open circuit, short circuit, and partial LED failure is achieved, improving diagnostic accuracy and response speed. The complex multi-fault states are simplified into clear high and low level binary signals, which greatly simplifies the diagnostic logic of the vehicle controller and reduces the computing power requirements of the controller.

[0032] (4) Introduce timing, multiple sampling, and fault confirmation cycle logic to avoid false alarms caused by signal interference or instantaneous abnormalities.

[0033] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0034] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein: Figure 1 This is a schematic diagram of a vehicle turn signal fault diagnosis device provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of another vehicle turn signal fault diagnosis device provided in an embodiment of this disclosure; Figure 3This is a flowchart illustrating a method for diagnosing a vehicle turn signal fault, provided in an embodiment of this disclosure. Figure 4 This is a flowchart illustrating a turn signal diagnostic method using left turn as an example, as provided in this embodiment of the disclosure.

[0035] Explanation of reference numerals in the attached figures: 100 Fault Diagnosis Device; 110 Left front turn signal; 120 Right front turn signal; 130 Left rear turn signal; 140 Right rear turn signal; 150 Vehicle controller; 160 Intelligent driving controller; 170 Turn signal switch. Detailed Implementation

[0036] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0037] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0038] Unless otherwise stated, the term "multiple" means two or more.

[0039] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0040] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0041] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0042] In some embodiments, a fault diagnosis device for vehicle turn signals is provided, comprising: a plurality of turn signals arranged in a matrix, including at least two columns and at least two rows, wherein each column includes at least two turn signals and each column corresponds to the same steering side, and each row includes at least two turn signals; a vehicle controller including a plurality of steering signal interfaces and a plurality of diagnostic signal interfaces; the plurality of steering signal interfaces are configured corresponding to at least two columns of turn signals, each steering signal interface being connected to the control input terminal of the turn signal in the corresponding column, so that each column of turn signals shares the same steering signal; the plurality of diagnostic signal interfaces are configured corresponding to at least two rows of turn signals, each diagnostic signal interface being connected to the diagnostic feedback output terminal of each column of turn signals in the corresponding row, so that each row of turn signals shares the same diagnostic signal.

[0043] For example, in combination Figure 1 As shown, multiple turn signals are arranged in a two-column, two-row matrix. The first column includes a left front turn signal 110 and a left rear turn signal 130. The second column includes a right front turn signal 120 and a right rear turn signal 140. The first row includes a left front turn signal 110 and a right front turn signal 120. The second row includes a left rear turn signal 130 and a right rear turn signal 140. The vehicle controller includes two turn signal interfaces: a left turn signal interface and a right turn signal interface. The first column of turn signals shares the left turn signal output from the left turn signal interface, and the second column shares the right turn signal output from the right turn signal interface. The vehicle controller also includes two diagnostic signal interfaces: a front turn signal diagnostic interface and a rear turn signal diagnostic interface. The first row of turn signals shares the diagnostic signal output from the front turn signal diagnostic interface, and the second row shares the diagnostic signal output from the rear turn signal diagnostic interface.

[0044] Specifically, the left turn signal interface is connected via wiring harness to the control input terminals of the left front turn signal 110 and the left rear turn signal 130 respectively; the right turn signal interface is connected via wiring harness to the control input terminals of the right front turn signal 120 and the right rear turn signal 140 respectively; the front turn signal diagnostic interface is connected via wiring harness to the diagnostic feedback output terminals of the left front turn signal 110 and the right front turn signal 120 respectively; and the rear turn signal diagnostic interface is connected via wiring harness to the diagnostic feedback output terminals of the left rear turn signal 130 and the right rear turn signal 140 respectively.

[0045] The vehicle turn signal fault diagnosis device 100 provided in this embodiment includes: a vehicle controller 150, a left front turn signal 110, a right front turn signal 120, a left rear turn signal 130, a right rear turn signal 140, and connecting wiring harnesses. The vehicle controller 150 has four output / acquisition interfaces: a left turn signal interface, a right turn signal interface, a front turn signal diagnostic interface, and a rear turn signal diagnostic interface. The left turn signal interface is connected to the left front turn signal 110 and the left rear turn signal 130 via wiring harnesses; the right turn signal interface is connected to the right front turn signal 120 and the right rear turn signal 140 via wiring harnesses; the front turn signal diagnostic interface is connected to the left front turn signal 110 and the right front turn signal 120 via wiring harnesses; and the rear turn signal diagnostic interface is connected to the left rear turn signal 130 and the right rear turn signal 140 via wiring harnesses. In this way, the turn signal control signals on the same side of the solution are necessarily synchronized; the turn signal diagnostic feedback on the same axis (front / rear) can be read at different times. The matrix connection method of sharing control signals by steering side and sharing diagnostic channels by position completely reduces the number of wiring harnesses, connector terminals and controller pins physically, directly achieving the goals of cost reduction, weight reduction and simplified layout.

[0046] For example, the wiring harness connection topology is set as follows: the left turn signal line originates from one pin of the vehicle controller 150 and is connected in a Y-shape or parallel configuration to the signal input terminals of both the left front turn signal 110 and the left rear turn signal 130. Similarly, the right turn signal line originates from another pin of the vehicle controller 150 and is connected in parallel to both the right front and right rear turn signals 140.

[0047] The front steering diagnostic line originates from an I / O pin of the vehicle controller 150 that has both high-level drive and level acquisition functions, and is connected in parallel to the diagnostic feedback output terminals of the left and right front turn signals 120. Similarly, the rear steering diagnostic line originates from another I / O pin of the vehicle controller 150 and is connected in parallel to the left and right rear turn signals 140.

[0048] Furthermore, by setting up independent physical diagnostic channels at the front and rear, the front diagnostic interface specifically collects feedback signals from the front position lights, and the rear diagnostic interface specifically collects feedback signals from the rear position lights. For example, when turning left, the left front light and the left rear light are activated, but they drive different diagnostic lines respectively; that is, the left front light drives the front diagnostic line, and the left rear light drives the rear diagnostic line. Thus, when turning left, the level of the front diagnostic line uniquely reflects the state of the left front light; the level of the rear diagnostic line uniquely reflects the state of the left rear light. All four turn signals can be independently located, eliminating the need for manual troubleshooting. Using the diagnostic device provided in this disclosure, the diagnostic resolution and accuracy of the turn signals are improved without adding any wiring harnesses or interfaces.

[0049] Optionally, the vehicle controller is configured to: in response to a diagnostic request from the target steering side, output a steering control signal through a steering signal interface corresponding to the target steering side, and simultaneously output a diagnostic enable signal through multiple diagnostic signal interfaces.

[0050] For example, with Figure 1 In the diagnostic system architecture of the embodiment, the vehicle controller 150 is configured to: in response to a left turn signal diagnostic request, output a left turn control signal through the left turn signal interface, and simultaneously output a diagnostic high-level signal through the front turn signal diagnostic interface and the rear turn signal diagnostic interface; in response to a right turn signal diagnostic request, output a right turn control signal through the right turn signal interface, and simultaneously output a diagnostic high-level signal through the front turn signal diagnostic interface and the rear turn signal diagnostic interface.

[0051] In this embodiment, the specific control logic of the vehicle controller 150 during the fault diagnosis process includes: The diagnostic trigger logic for the left turn signal includes the following: When the vehicle controller 150 determines that the left turn signal needs diagnostics, it performs a dual output operation, namely, a control signal output and a diagnostic signal output. The control signal output includes: outputting a left turn control signal through the left turn signal interface, which drives the left turn signal to illuminate, i.e., the left front turn signal 110 and the left rear turn signal 130. The diagnostic signal output includes: simultaneously outputting a diagnostic high-level signal through both the front and rear turn signal diagnostic interfaces. This high-level signal is sent to the left front and rear turn signals as a trigger signal or reference signal for fault diagnosis.

[0052] The diagnostic trigger logic for the right turn signal includes: when the vehicle controller 150 determines that the right turn signal needs diagnostics, it executes a dual output operation, namely a control signal output and a diagnostic signal output. The control signal output includes: outputting a right turn control signal through the right turn signal interface to drive the right turn signal to illuminate, i.e., illuminating the right front turn signal 120 and the right rear turn signal 140. The diagnostic signal output includes: simultaneously outputting a diagnostic high-level signal through both the front turn signal diagnostic interface and the rear turn signal diagnostic interface.

[0053] In this embodiment, the front turn signal diagnostic interface is connected to the left front turn signal 110 and the right front turn signal 120, respectively, and the rear turn signal diagnostic interface is connected to the left rear turn signal 140 and the right rear turn signal 140, respectively. By outputting a high-level signal to the diagnostic interface only when one of the turn signals is activated, time-division multiplexing of the diagnostic signal is achieved, meaning that the same diagnostic line serves the turn signal diagnostics of different sides at different times. By outputting a high-level diagnostic signal in conjunction with the internal diagnostic circuit of the turn signal, it can effectively support the detection of various fault modes such as open circuit, short circuit, and partial LED failure of the turn signal, making up for the shortcomings of the incomplete detection range of the prior art. Furthermore, by adopting a dual output operation of executing control signal output and diagnostic signal output, only the turn signal on the side that receives the turn control signal will provide diagnostic feedback. For example, when the left turn signal is activated, although the right front turn signal 120 is also connected to the front turn signal diagnostic line, it will not interfere with the level state of the diagnostic line because it has not received the right turn control signal, thus effectively avoiding interference from the non-target turn signal side turn signal on the diagnostic results and improving the accuracy of the diagnosis.

[0054] Optionally, the left front turn signal 110, right front turn signal 120, left rear turn signal 130, and right rear turn signal 140 each integrate a diagnostic circuit for detecting their own operating status and a feedback circuit for outputting diagnostic results; wherein, the feedback circuit is configured to: for each turn signal, based on the operating status of the turn signal, control the level on the diagnostic signal interface connected to the turn signal; the operating status is determined based on the diagnostic circuit.

[0055] Optionally, the feedback circuit is further configured to: adjust the diagnostic enable signal on the diagnostic signal interface connected to the corresponding turn signal to a preset level when the working state of the corresponding turn signal is normal; and keep the level on the diagnostic signal interface connected to the corresponding turn signal unchanged when the working state of the corresponding turn signal is faulty.

[0056] In some examples, if the diagnostic circuit determines that the turn signal is functioning normally, it will pull the high-level signal connected to the diagnostic interface down to a low level; if the diagnostic circuit determines that the turn signal is functioning incorrectly, it will keep the high-level signal connected to the diagnostic interface unchanged.

[0057] In this embodiment, the diagnostic circuit is used to detect the operating status of the turn signal itself, and its detection range includes fault modes such as open circuit, short circuit, and partial LED failure. When the diagnostic circuit determines that the turn signal is operating normally, the feedback circuit is triggered, actively pulling the high-level signal on the diagnostic interface down to a low level. When the diagnostic circuit determines that the turn signal is faulty, the feedback circuit does not activate, maintaining the high-level signal on the diagnostic interface unchanged, i.e., maintaining a high level. In this way, the complex current and voltage diagnostic results are converted into simple level signals. The vehicle controller 150 only needs to detect the high and low levels on the diagnostic line to determine the fault, without requiring the controller itself to perform complex analog signal analysis, thus reducing the software complexity and computing power requirements of the controller.

[0058] This logic requires coordination with the signal output of the vehicle controller 150: the turn signal must simultaneously receive both a turn signal activation signal and a diagnostic high-level signal before the internal diagnostic process is initiated and the aforementioned feedback operation is executed. Furthermore, time-division multiplexing of the diagnostic signal is achieved through the internal diagnostic and feedback circuits of the turn signal. For example, when the left front turn signal 110 is functioning normally, its diagnostic line is pulled low. Even if the right front turn signal 120 is connected in parallel to this diagnostic line, the right front turn signal 120 is not activated and is not pulled low. In this way, the vehicle controller 150 can accurately receive the low-level signal, thereby determining that the left turn signal is normal. This avoids interference from non-target turn signals on the diagnostic results, improving the accuracy of the diagnostic results while reducing the number of wiring harnesses.

[0059] By integrating diagnostic circuits inside the turn signal, various specific fault types such as open circuit, short circuit, and partial LED failure can be detected directly at the source, solving the problem of incomplete detection range of existing technologies and achieving accurate monitoring of the turn signal status.

[0060] Optionally, the turn signal diagnostic circuit includes: a power management module, a control signal interface module, an LED driver and power module, and a fault detection module. The power management module is connected to the control signal interface module, the LED driver and power module, and the fault detection module. The feedback circuit includes a feedback output module. The power management module provides a stable operating voltage for the diagnostic circuit. The control signal interface module receives the steering control signal from the vehicle controller 150. The LED driver and power module drives the LEDs to emit light, providing operating current. The fault detection module monitors the operating current and voltage parameters in real time. The feedback output module lowers or maintains the diagnostic line level based on the diagnostic results.

[0061] The power management module obtains a 12V input from the vehicle's power system, which is then converted into a stable 5V operating voltage by a voltage regulator chip. A filter capacitor filters out power supply noise, providing clean power to the diagnostic circuit. This 5V voltage supplies the operational amplifiers and comparators of the control signal interface module and the fault detection module.

[0062] The control signal interface module includes a current-limiting resistor, an opto-isolator, and a shaping circuit that are electrically connected. The working principle is as follows: The steering control signal output by the vehicle controller 150 is connected to the input side of the opto-isolator through the current-limiting resistor. The opto-isolator achieves electrical isolation to prevent interference from the power side from entering the control side. The output side of the opto-isolator is connected to +5V through a pull-up resistor and outputs a shaped digital signal. The shaped signal is sent to the LED driving module as a lighting instruction. At the same time, this signal serves as a diagnostic enable signal to activate the fault detection module.

[0063] The LED driving and power module includes a constant-current driving chip and a sampling circuit that are electrically connected. The working principle is as follows: The constant-current driving chip receives the control signal, enables the output, and the driving chip outputs a constant current to drive the LED string to emit light. The magnitude of the current is determined by the current-setting resistor to ensure that the LED operates at the optimal current. The sampling resistor is connected in series in the LED loop to convert the current signal into a voltage signal. The voltage at the upper end of the sampling resistor is sent to the fault detection module as a current monitoring point. The voltage across the LED string is sent to the fault detection module as a voltage monitoring point.

[0064] The fault detection module includes a current detection unit, a voltage detection unit, and a comparison and decision unit. Among them, the voltage difference across the sampling resistor of the current detection unit is amplified by an operational amplifier, and the amplified voltage is compared with a preset reference voltage Vref1. Vref1 corresponds to the lower current threshold for the normal operation of the LED. If the amplified voltage < Vref1, it indicates that the current is too low, corresponding to the fault types of open circuit or partial failure. The detection of excessive current is completed by the internal protection circuit of the driving chip, and a fault flag is output. The voltage detection unit is used to connect the voltage across the LED string to a comparator after stepping down through a voltage-dividing resistor network. The voltage-dividing ratio ensures that the voltage is within the input range of the comparator (0 - 5V). The preset reference voltage Vref2 corresponds to the upper voltage threshold for the normal operation of the LED. If the divided voltage > Vref2, it indicates that the voltage is too high, corresponding to the fault type of partial LED open circuit and the remaining LEDs承受 increased voltage. If the divided voltage < the lower voltage threshold for the normal operation of the LED, it indicates a short circuit or abnormal driving. The comparison and decision unit connects the three detection channels, namely low current, high voltage, and driving chip failure, to an OR gate. If any channel outputs a high level, the fault flag is at a high level. If all channels output a low level, the fault flag is at a low level. The fault flag is sent to the feedback output module to control the MOSFET switch.

[0065] The feedback output module is configured such that in the normal state, that is, when the fault flag is at a low level, it controls the inverter to output a high level, drives the MOSFET to conduct, and the diagnostic interface is shorted to the ground through the MOSFET, pulling it down to a low level. Also, in the fault state, that is, when the fault flag is at a high level, it controls the inverter to output a low level, and the MOSFET is turned off. The diagnostic interface is in a high-impedance state and is held at a high level by the internal pull-up resistor of the vehicle controller 150.

[0066] By employing the diagnostic circuit provided in this disclosure, it is possible to detect various modes such as open circuit, short circuit, partial LED failure, and driver chip failure. Table 1 shows the circuit response mapping table for different fault modes.

[0067] Table 1 Circuit response mapping table under different fault modes

[0068] Combination Figure 2 As shown, the fault diagnosis device 100 also includes: a 4-channel acquisition device, which is respectively connected to: the left turn signal line, the right turn signal line, the front turn diagnostic line and the rear turn diagnostic line.

[0069] Combination Figure 2 As shown, the fault diagnosis device 100 also includes an intelligent driving controller 160. The intelligent driving controller 160 controls and processes the environment and driving status of the vehicle during intelligent driving. When changing lanes or turning, it sends a turn signal activation request to the vehicle controller 150 and receives the turn signal and turn signal malfunction signal from the vehicle controller 150 to assess whether the lane change conditions are met.

[0070] Combination Figure 2 As shown, the fault diagnosis device 100 also includes a turn signal switch 170. The turn signal switch 170 is used to manually control the turn signals to turn on / off. The turn signal switch 170 can send a left turn signal or a right turn signal to turn on / off to the vehicle controller 150. The vehicle controller 150 drives the left front turn signal 110 and the left rear turn signal 130 or the right front turn signal 120 and the right rear turn signal 140 to turn on and flash or turn off simultaneously according to the signal from the turn signal switch 170.

[0071] In some embodiments, the vehicle controller 150 is connected to the intelligent driving controller 160 and the turn signal switch 170 via a wiring harness. The left turn signal interface of the vehicle controller 150 is connected to the left front turn signal 110 and the left rear turn signal 130 via a wiring harness. After the vehicle controller 150 centrally outputs the left turn signal on / off signal through the left turn signal interface, it is then transmitted to the left front turn signal 110 and the left rear turn signal 130 respectively via the wiring harness. The right turn signal interface of the vehicle controller 150 is also connected to the right front turn signal 120 and the right rear turn signal 140 via a wiring harness. After the vehicle controller 150 centrally outputs the right turn signal on / off signal through the right turn signal interface, it is then transmitted to the right front turn signal 120 and the right rear turn signal 140 respectively via the wiring harness.

[0072] In some embodiments, combined with Figure 3 As shown, a fault diagnosis method for vehicle turn signals is provided, applied to the fault diagnosis device for vehicle turn signals as described in any of the above embodiments. The diagnosis method includes: S301, in response to the turn signal activation request, determine the target steering side corresponding to the turn signal activation request; S302, outputs a steering control signal to at least one turn signal on the target steering side through a steering signal interface corresponding to the target steering side; S303 outputs diagnostic enable signals through multiple diagnostic signal interfaces to enable diagnostics for each turn signal on the target steering side and determines the level signals connected to the multiple diagnostic signal interfaces. S304, within a preset diagnostic feedback time period, collects the level signals on each diagnostic signal interface; S305 determines the operating status of each turn signal on the target steering side based on the acquired level signal. The operating status includes normal status or fault status.

[0073] In this embodiment, the diagnostic method is applied to a vehicle turn signal fault diagnosis device. The vehicle controller responds to a turn signal activation request and determines the target steering side. The turn signal activation request is issued via the intelligent driving controller or the turn signal switch. A steering control signal is output to at least one turn signal on the target steering side through the target steering side steering signal interface. Simultaneously, diagnostic enable signals are output through multiple diagnostic signal interfaces. Since the turn signals on non-target steering sides do not receive the turn signal activation signal, they do not undergo fault diagnosis and the level on the diagnostic lines is not affected, thus achieving multiplexing of the diagnostic lines.

[0074] The diagnostic circuit integrated inside the turn signal on the target steering side performs a self-test after receiving the activation signal and the diagnostic enable signal. If the self-test is normal, the turn signal on the target steering side adjusts the diagnostic enable signal of the diagnostic line to a preset level through the feedback circuit; if a fault is detected, the high level remains unchanged.

[0075] The vehicle controller acquires level signals within a preset diagnostic feedback time period. The acquisition begins after the turn signal has completed its internal processing and diagnostics.

[0076] The acquisition strategy involves acquiring data N times within the illumination cycle, following a preset sampling period. N is an integer greater than or equal to 1. If at least one of the N acquired signals is at the preset level, the turn signal is considered normal; otherwise, all signals are high, indicating a turn signal malfunction. For example, the diagnostic enable signal is high, and the preset level is low.

[0077] Thus, by adopting the diagnostic method provided in this disclosure, two diagnostic signal lines are shared between the front and rear turn signals, replacing the existing scheme of separate wiring for each turn signal, significantly reducing the number of wiring harnesses and controller interface resources. Combined with the self-diagnostic circuit inside the turn signal, it can effectively detect various fault modes such as open circuit, short circuit, partial LED failure, and feedback delay, making up for the shortcomings of the incomplete detection range of the prior art.

[0078] Furthermore, the judgment logic employing multiple sampling and multi-cycle confirmation effectively filters out false alarms caused by transient interference in the signal lines, preventing limitations in intelligent driving functions due to misdiagnosis and improving the system's fault tolerance. Only four wiring harnesses need to be connected to achieve monitoring and comparative analysis of all vehicle turn signal signals, facilitating rapid identification of faulty components and improving maintenance and troubleshooting efficiency.

[0079] For example, the control logic of the time-division multiplexing diagnostic mechanism includes: when the vehicle controller receives a left turn command, it simultaneously outputs: a left turn high-level signal LSignal, a front diagnostic high-level signal FDiag, and a rear diagnostic high-level signal RDiag.

[0080] At this time, only the left front turn signal receivers LSIignal and FDIag, and the left rear turn signal receivers LSIignal and RDIag are activated and enter diagnostic mode. Although the right front / right rear turn signals are physically connected to the FDIag and RDIag lines, their internal diagnostic circuits are not working because they do not receive RSignal, exhibiting a high impedance state to the diagnostic lines, which does not affect the diagnosis of the left turn signal. The vehicle controller only needs to monitor the left front turn signal diagnostic line to determine the status of the left front turn signal and monitor the right rear turn signal diagnostic line to determine the status of the left rear turn signal.

[0081] When performing a right turn diagnosis, the process is mirror-symmetrical and will not be described in detail.

[0082] The multiplexing of diagnostic lines is not simultaneous, but rather selected by the steering control signal. Specifically, LSignal acts as the chip select signal for the left front and left rear lights, and RSIignal acts as the chip select signal for the right front and right rear lights. This solves the core problem of how to serve two lights with a single diagnostic line without conflict. By introducing timing logic with control signals as selection conditions, it ensures that at any given time, at most one light on the same diagnostic line is actively providing feedback, avoiding signal conflicts and misjudgments caused by multiple lights simultaneously pulling low. This disclosure applies the bus and chip select functions from digital circuits to the automotive body wiring harness system, making two diagnostic lines functionally equivalent to four independent diagnostic lines, simplifying the hardware structure while achieving the same functionality.

[0083] Optionally, the steps for activating diagnostics on each turn signal on the target steering side include: detecting the operating parameters of the turn signal; adjusting the diagnostic enable signal connected to the diagnostic signal interface to a preset level through a feedback circuit if the operating parameters meet the normal conditions of the turn signal; and maintaining the level of the diagnostic enable signal connected to the diagnostic signal interface unchanged through a feedback circuit if the operating parameters do not meet the normal conditions of the turn signal.

[0084] Optionally, the operating parameters include operating current and / or operating voltage; normal conditions for the turn signal refer to the operating parameters being within the preset parameter range.

[0085] In this embodiment, the diagnostic circuit inside the turn signal first detects its own operating parameters. These parameters include operating current and / or operating voltage. The diagnostic circuit compares the detected operating parameters in real time with internally preset parameter ranges. Based on the comparison result, the feedback circuit processes the level signal of the diagnostic interface accordingly. If the operating parameters are within the preset parameter range, the turn signal is determined to be normal. If the feedback circuit activates, it pulls the high-level signal on the corresponding diagnostic interface down to a low level. If the operating parameters exceed the preset parameter range, a turn signal malfunction is determined. If the feedback circuit does not activate, the high-level signal on the corresponding diagnostic interface remains unchanged.

[0086] By monitoring analog parameters such as current and voltage, this system can effectively identify fault types that are difficult to cover by traditional detection methods, such as LED short circuits and partial LED failures, overcoming the limitation of existing technologies that can only detect open circuit faults. Complex analog diagnostic results are directly converted into simple digital level signals within the turn signal itself. The vehicle controller does not need to perform complex analog signal analysis; it only needs to read the level status to determine the fault condition, reducing the requirements on the controller's computing power and signal acquisition accuracy. Furthermore, when the turn signals on the same side are working, as long as any one of the lights is normal and pulls its level low, the controller can determine that the circuit is normal, effectively supporting hardware architecture designs that reduce the number of wiring harnesses.

[0087] Optionally, the preset parameter range is specifically determined based on the specifications of the turn signal. For example, for an LED string with a rated current of 350mA, the normal operating current range can be set to ±20% of the rated current value, and the voltage range can be calculated based on the number of LEDs connected in series and the typical voltage drop of each LED.

[0088] Optionally, the electrical characteristics of LEDs change with temperature, with the forward voltage drop decreasing at high temperatures. Preset parameter ranges are adjusted based on the LED temperature. Specifically, by integrating a temperature sensor inside the turn signal, the diagnostic circuit can adjust the voltage threshold range according to the real-time temperature, avoiding misjudgments caused by temperature changes. The voltage threshold adjustment rule based on temperature is as follows: with 25℃ as a reference, the upper voltage threshold... ,in, N represents the number of LEDs connected in series. T represents the current internal temperature of the turn signal.

[0089] Optionally, the step of acquiring the level signals on each of the diagnostic signal interfaces within a preset diagnostic feedback time period includes: determining the signal acquisition stage; wherein, determining the signal acquisition stage includes starting the timing when the output switches to the control signal and the diagnostic enable signal, and then entering the signal acquisition stage after a preset delay time; within the signal acquisition stage, the level signals on each of the diagnostic signal interfaces are sampled at least once according to a preset sampling period.

[0090] In this embodiment, the vehicle controller begins timing when it outputs the steering control signal and the diagnostic enable signal. Data acquisition is not performed immediately; instead, a preset delay is followed before entering the signal acquisition phase. This delay must be later than the sum of the turn signal's internal processing time and the diagnostic feedback time to ensure that the turn signal has completed its internal diagnostics and output the corresponding level signal, thus avoiding the acquisition of invalid transitional state signals.

[0091] After entering the signal acquisition phase, the level signals on the front turn signal diagnostic interface and the rear turn signal diagnostic interface are acquired according to the preset sampling period. Furthermore, during the duration of the turn signal illumination, a total of N acquisitions are performed, where N is an integer greater than or equal to 1; preferably, at least two acquisitions are performed.

[0092] By setting a delayed acquisition time, the unstable current and voltage period at the initial stage of turn signal illumination and the reaction time required for diagnostic circuit processing are effectively avoided, ensuring that the level signal acquired by the controller is a stable output result after the turn signal has completed diagnosis, and preventing misjudgment due to timing mismatch.

[0093] By employing multiple sampling, even if transient electromagnetic interference or pulse interference occurs on the diagnostic signal line, as long as a normal low-level signal is detected in one out of N samples, the controller can determine that the turn signal is working properly. This effectively filters out false alarms caused by external interference, greatly improving the robustness of the fault diagnosis system.

[0094] Optionally, the step of determining the working status of each turn signal on the target steering side based on the collected level signal includes: for each diagnostic signal interface, if there is a signal level change in at least one sampling, the working status of the turn signal corresponding to the diagnostic signal interface is determined to be normal; if the signal level remains unchanged in at least one sampling, the working status of the turn signal corresponding to the diagnostic signal interface is determined to be faulty.

[0095] In this embodiment, the vehicle controller processes two sets of level signal data obtained from N samplings of the front and rear turn signal diagnostic interfaces during the signal acquisition phase. For the set of level signals corresponding to the front turn signal diagnostic interface, the results of the N samplings are checked: if at least one level change occurs in the set of results, for example, from high to low, the target turn signal connected to the front turn signal diagnostic interface is considered to be functioning normally. If the level remains unchanged in the set of results, for example, if all results are high, the target turn signal is considered to be faulty.

[0096] For a set of level signals corresponding to the rear turn signal diagnostic interface, check the results of multiple samplings: if at least one low-level signal is present in the set of results, the target steering side rear turn signal connected to the rear turn signal diagnostic interface is considered to be working normally. If all signals in the set of results are high-level signals, the target steering side rear turn signal is considered to be faulty.

[0097] Based on the above judgment results, an overall diagnostic conclusion is formed regarding the working status of all turn signals on the target steering side.

[0098] Within a preset diagnostic feedback time period, N samples are taken. If at least one low-level signal is detected, the turn signal on the target steering side is considered normal. This effectively filters out occasional high-level signals caused by electromagnetic interference or momentary signal line jitter. Even if the diagnostic signal is briefly interfered with, causing some sampling points to be high-level, as long as the turn signal is actually working normally and provides a low-level feedback, the system can still correctly determine it as normal, thus avoiding false alarms.

[0099] If the signal remains high throughout multiple sampling processes, it is determined that the turn signal on the target steering side is faulty.

[0100] This judgment logic improves the reliability of fault diagnosis results even in complex vehicle electrical environments, preventing incorrect turn signal flashing or limited intelligent driving functions due to misdiagnosis.

[0101] Optionally, if it is determined that the turn signal on the target steering side is in a faulty state, then at least one of the following processes is performed: controlling the turn signal on the faulty side to flash at a preset frequency; or sending a turn signal fault signal to the vehicle's intelligent driving controller.

[0102] In this embodiment, after diagnosing a turn signal malfunction, the specific measures taken by the vehicle controller include at least one of the following: One approach is for the vehicle controller to control the turn signal on the faulty side to flash at a preset frequency. Optionally, the preset frequency can be higher than the normal flashing frequency to visually alert the driver. By controlling the turn signal on the faulty side to flash rapidly, this complies with vehicle regulations regarding turn signal malfunction indications, providing a clear and timely warning to the driver of any abnormality, prompting them to take appropriate action and improving driving safety.

[0103] One approach involves the vehicle controller sending a turn signal malfunction signal to the vehicle's intelligent driving controller. Upon receiving this signal, the intelligent driving controller determines whether to suspend or adjust the intelligent driving operation based on whether the current lane-changing or turning conditions are met, ensuring driving safety. By feeding back the malfunction signal to the intelligent driving controller, the intelligent driving system can obtain real-time vehicle status information, preventing the forced execution of automatic lane-changing or turning commands when the turn signal is malfunctioning. This avoids traffic accidents caused by unclear signal indications and improves the reliability of the intelligent driving system.

[0104] In some examples, based on the diagnostic systems and methods described above, combined with Figure 4 The diagram shows the diagnostic process for turn signals, taking left turn as an example.

[0105] S401, Receive turn signal activation request and determine the target turning side as the left.

[0106] When the driver activates the turn signal switch to the left turn position, or when the intelligent driving controller sends a left turn request to the vehicle controller due to a planned lane change to the left, the vehicle controller receives the turn signal activation request and determines that the target turning side for this diagnosis is the left side.

[0107] S402 outputs steering control signals and diagnostic high-level signals.

[0108] The vehicle controller outputs a left turn control signal, such as a 12V PWM square wave, through the left turn signal interface. This signal is simultaneously sent to the control input terminals of the left front turn signal and the left rear turn signal via a parallel wiring harness. At the same time, the vehicle controller outputs diagnostic high-level signals, such as 12V, through the front turn signal diagnostic interface and the rear turn signal diagnostic interface, respectively. These signals are sent via parallel wiring harnesses to the diagnostic feedback output terminals of the left and right front turn signals, and the left and right rear turn signals, respectively.

[0109] It should be noted that since the right front turn signal and the right rear turn signal do not receive the corresponding right turn control signal at this time, their internal diagnostic circuits remain in a dormant state, and the feedback output is in a high-impedance state, which will not pull down the level of the front and rear diagnostic lines. Therefore, the left and right lights connected in parallel on the same diagnostic line will not cause signal conflict.

[0110] S403, internal fault diagnosis of turn signal.

[0111] Upon simultaneously receiving both the steering control signal and the diagnostic high-level signal, the left front turn signal and the left rear turn signal initiate their respective internal diagnostic processes. Taking the left front turn signal as an example, its internal diagnostic circuit monitors the operating current of the LED drive circuit in real time. This diagnostic circuit includes a sampling resistor and a comparator, which compares the sampled voltage with a preset threshold range. The preset threshold range corresponds to ±20% of the normal operating current.

[0112] If the operating current is within a preset range, for example, a nominal current of 350mA and a measured current of 340mA, the diagnostic circuit determines that the turn signal is normal, and the N-channel MOSFET in the control feedback circuit is turned on, pulling the high-level signal on the front turn signal diagnostic interface down to a low level.

[0113] If the operating current exceeds the preset range, such as an open circuit causing the current to be 0, a short circuit causing the current to surge to more than 2A, or some LEDs failing causing the current to drop to 200mA, the diagnostic circuit determines that the turn signal is faulty, keeps the MOSFET off, and the high-level signal on the front turn signal diagnostic interface remains unchanged.

[0114] The diagnostic process for the left rear turn signal is the same as described above, except that its feedback circuit operates on the rear turn signal diagnostic interface.

[0115] S404, the vehicle controller delays and waits to acquire the level signal.

[0116] The vehicle controller begins timing when it outputs the steering control signal and the diagnostic high-level signal. The preset delay time is set to 110ms, which is greater than the maximum time required for the left front and left rear lights to complete internal diagnostics and feedback. After the delay time expires, the vehicle controller enters the signal acquisition phase.

[0117] During the signal acquisition phase, the vehicle controller samples the level signals on the front turn signal diagnostic interface and the rear turn signal diagnostic interface four times consecutively according to the preset sampling period. In this embodiment, the preset sampling period of T7 is 10ms.

[0118] S405 determines the working status based on the sampling results.

[0119] Four sampling results for the front turn signal diagnostic interface: If at least one low-level signal is present in the four samples, the left front turn signal is determined to be working normally. If the signal remains high throughout all four samples, for example, if the sample value is 12V, then the left front turn signal is determined to be faulty.

[0120] The same decision logic is used to determine the working status of the left rear turn signal based on the four sampling results of the rear turn signal diagnostic interface.

[0121] S406, Fault Confirmation and Handling.

[0122] If the left front turn signal is determined to be faulty in this diagnostic cycle, the vehicle controller records a suspected fault. In the subsequent second working cycle, the vehicle controller repeats steps S402 to S405. If the light is determined to be faulty in three consecutive working cycles, the vehicle controller finally confirms a fault in the left front turn signal.

[0123] After confirming the fault, the vehicle controller executes the following handling strategy: Control the left turn signal to flash rapidly at a frequency of 120 times per minute, while the normal flashing frequency is 85 times per minute; The system sends a left front turn signal fault signal to the intelligent driving controller via the CAN bus. Based on this signal, the intelligent driving controller cancels the planned automatic lane change request and prompts the driver to check the left front turn signal on the instrument cluster.

[0124] If the left front turn signal returns to normal during the subsequent flashing process, for example, due to poor contact, and the vehicle controller re-acquires a low-level signal within one working cycle, the fault record will be cleared, the left turn signal will return to its normal flashing frequency, and a fault clearance signal will be sent to the intelligent driving controller.

[0125] The diagnostic process for right turn is completely symmetrical to that for left turn. The right front and right rear lights are selected by the right turn signal, and the same set of front and rear diagnostic interfaces are used for diagnosis and feedback. This will not be elaborated further here.

[0126] In some examples, the front turn signal diagnostic interface reuse process is implemented based on the diagnostic system and methods described above. This embodiment focuses on how the front turn signal diagnostic interface achieves independent diagnosis of the left and right front turn signals through time-division multiplexing.

[0127] Combination Figure 1 The front turn signal diagnostic interface is connected in parallel to the diagnostic feedback outputs of the left and right front turn signals via a single physical wiring harness. Physically, this interface can only present a single voltage level at any given time, either high or low. However, through the timing control mechanism of this invention, this physical interface is logically equivalent to two independent diagnostic channels: In period one, when the left turn signal is activated: the vehicle controller outputs a left turn control signal. At this time, the left front turn signal is activated, and its feedback circuit determines whether to lower the level of the front diagnostic line based on its own diagnostic results; the right front turn signal, not receiving a right turn control signal, has a high impedance at its feedback output. Therefore, the level on the front diagnostic line uniquely reflects the health status of the left front turn signal.

[0128] In the second phase, when the right turn signal is activated: the vehicle controller outputs a right turn control signal. At this time, the right front turn signal is activated, and its feedback circuit determines whether to lower the level of the front diagnostic line; the left front turn signal enters a high-impedance state. The level state on the front diagnostic line uniquely reflects the health status of the right front turn signal.

[0129] In phase three, when the hazard lights are activated: the vehicle controller simultaneously outputs left and right turn control signals. At this time, both the left and right front turn signals are activated simultaneously. If both diagnostic results are normal, they will simultaneously attempt to lower the front diagnostic line, which is permissible because the line and logic can still present a low level, allowing the vehicle controller to determine that both front lights are normal. If one light is faulty and remains in a high-impedance state, while the other is normal and lowers its level, the front diagnostic line can still be pulled low. The vehicle controller can sense that at least one light is normal, but cannot distinguish whether it is the left or right light. Therefore, in hazard light mode, this solution can detect whether at least one front turn signal is normal, but cannot precisely pinpoint which specific light is faulty. To address this scenario, in vehicle maintenance diagnostic mode, independent single-side diagnostics can be performed by operating the left / right turn switches separately to achieve precise location.

[0130] This embodiment achieves a hardware architecture that significantly simplifies wiring harnesses while, through clever timing control, providing diagnostic functionality almost equivalent to a one-to-one connection solution.

[0131] In some embodiments, a vehicle is provided, including: a vehicle body; and a vehicle turn signal fault diagnosis device as described in any of the above embodiments, mounted on the vehicle body.

[0132] In some embodiments, a computer-readable storage medium is provided storing program instructions that, when executed, cause a computer to perform a vehicle turn signal fault diagnosis method as described in any of the above embodiments.

[0133] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, such as a USB flash drive, external hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc., and other media capable of storing program code.

[0134] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0135] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0136] The methods and products disclosed in the embodiments herein (including but not limited to devices and equipment) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0137] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A fault diagnosis device for vehicle turn signals, characterized in that, include: Multiple turn signals are arranged in a matrix, including at least two columns and at least two rows, wherein each column includes at least two turn signals and each column corresponds to the same turning side, and each row includes at least two turn signals; The vehicle controller includes multiple steering signal interfaces and multiple diagnostic signal interfaces. The multiple steering signal interfaces are configured corresponding to at least two columns of turn signals, and each steering signal interface is connected to the control input terminal of the corresponding column of turn signals, so that each column of turn signals shares the same steering signal. The multiple diagnostic signal interfaces are configured corresponding to at least two rows of turn signals, and each diagnostic signal interface is connected to the diagnostic feedback output terminal of each column of turn signals in the corresponding row, so that each row of turn signals shares the same diagnostic signal.

2. The apparatus according to claim 1, characterized in that, The vehicle controller is configured as follows: In response to a diagnostic request from the target steering side, a steering control signal is output through the steering signal interface corresponding to the target steering side, and a diagnostic enable signal is output through the multiple diagnostic signal interfaces.

3. The apparatus according to claim 1, characterized in that, Each of the turn signals integrates a diagnostic circuit for detecting its own operating status and a feedback circuit for outputting diagnostic results. The feedback circuit is configured to control the level on the diagnostic signal interface connected to each turn signal, based on the operating state of the turn signal; the operating state is determined based on the diagnostic circuit.

4. The apparatus according to claim 3, characterized in that, The feedback circuit is also configured to: When the working state of the target turn signal is normal, adjust the diagnostic enable signal on the diagnostic signal interface connected to the target turn signal to a preset level. If the working state of the targeted turn signal is faulty, the level on the diagnostic signal interface connected to the targeted turn signal remains unchanged.

5. A method for diagnosing faults in vehicle turn signals, characterized in that, The diagnostic method includes: In response to a turn signal activation request, determine the target steering side corresponding to the turn signal activation request; A steering control signal is output to at least one turn signal on the target steering side via a steering signal interface corresponding to the target steering side; Diagnostic enable signals are output through multiple diagnostic signal interfaces to enable diagnostics for each turn signal on the target steering side, and to determine the level signals connected to the multiple diagnostic signal interfaces. Within a preset diagnostic feedback time period, the level signals on each of the diagnostic signal interfaces are collected; Based on the collected level signals, the operating status of each turn signal on the target steering side is determined; the operating status includes normal status or fault status.

6. The method according to claim 5, characterized in that, The steps for activating and diagnosing each turn signal on the target steering side include: Detect the operating parameters of the turn signal; When the operating parameters meet the normal conditions of the turn signal, the diagnostic enable signal connected to the diagnostic signal interface is adjusted to a preset level through the feedback circuit; If the operating parameters do not meet the normal conditions of the turn signal, the feedback circuit maintains the level of the diagnostic enable signal connected to the diagnostic signal interface unchanged.

7. The method according to claim 5, characterized in that, The step of acquiring the level signals on each of the diagnostic signal interfaces within a preset diagnostic feedback time period includes: Determine the signal acquisition stage; During the signal acquisition phase, the level signal on each of the diagnostic signal interfaces is sampled at least once according to a preset sampling period.

8. The method according to claim 7, characterized in that, The step of determining the operating status of each turn signal on the target steering side based on the acquired level signal includes: For each diagnostic signal interface, if there is a signal level change in at least one sampling, the working state of the turn signal corresponding to the diagnostic signal interface is determined to be normal. If the signal level remains unchanged in at least one sampling, the working state of the turn signal corresponding to the diagnostic signal interface is determined to be a fault state.

9. The method according to any one of claims 5 to 8, characterized in that, Also includes: If it is determined that the turn signal on the target steering side is in a faulty state, then at least one of the following processing methods shall be performed: Control the turn signal on the faulty side to flash at a preset frequency; or, Send a turn signal malfunction signal to the vehicle's intelligent driving controller.

10. A vehicle, characterized in that, include: Vehicle body; The vehicle turn signal fault diagnosis device as described in any one of claims 1 to 4 is installed on the vehicle body.

11. A computer-readable storage medium storing program instructions, characterized in that, When the program instructions are executed, they cause the computer to perform the fault diagnosis method for the vehicle turn signals as described in any one of claims 5 to 9.

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