Diagnostic methods, devices, and storage media for vehicle turn signal malfunctions

Abstract

This invention provides a method, apparatus, and storage medium for diagnosing vehicle turn signal malfunctions. The method includes: configuring the light source type of the vehicle turn signal; determining whether to perform absolute or relative diagnosis on the vehicle turn signal based on the light source type; if performing absolute diagnosis, determining whether the turn signal malfunctions based on a first absolute load current and a second absolute load current; if performing relative diagnosis, determining whether the turn signal malfunctions based on a first relative load current and a second relative load current. The vehicle turn signal malfunction diagnosis method provided in this application can be applied to vehicle models with combination turn signals and all-halogen lamps. By adopting an off-line configuration approach, it can easily and conveniently diagnose turn signal malfunctions without requiring frequent software changes to the body controller to adapt to different vehicle models, thereby saving software development time and reducing costs.

Description

Technical Field

[0001] This application relates to the field of vehicle turn signal technology, specifically to a method, device, and storage medium for diagnosing vehicle turn signal malfunctions. Background Technology

[0002] Vehicle turn signals are important indicator lights that activate when a motor vehicle turns to alert vehicles and pedestrians in front, behind, to the sides. If the turn signals malfunction, they will fail to provide this warning, potentially leading to traffic accidents. Therefore, troubleshooting vehicle turn signals is crucial. Vehicle turn signals are typically categorized as follows: left front turn signal, left side turn signal, left rear turn signal, right front turn signal, right side turn signal, and right rear turn signal. When any of these turn signals malfunctions, the vehicle's control system must be able to diagnose the fault and activate the remaining, functional turn signals to flash at different frequencies. This is a requirement stipulated in GB4785 automotive lighting regulations.

[0003] Currently, vehicle turn signals can be configured with either all halogen lamps or all LED lamps (light-emitting diodes). Firstly, for vehicles with all halogen lamps, the vehicle control system typically uses an intelligent driver chip for current diagnosis. This chip reads the drive current value and sets a certain current threshold. When the drive current falls below a certain value, it is considered that a particular turn signal is faulty, and the system switches to a different frequency to drive the remaining normal halogen lamps. Secondly, for vehicles with all LED lamps, each LED lamp communicates its fault status to the vehicle controller via a fault feedback line. The vehicle controller obtains the fault status of the corresponding LED lamp by reading the high and low level signals of the fault feedback line. If at least one LED lamp is faulty, the system switches to a different frequency to drive the remaining normal LED lamps.

[0004] For vehicles with all-halogen or all-LED turn signals, the body control system has a relatively mature diagnostic solution, as described above. However, for turn signal configurations consisting of a combination of halogen and LED lights, there is currently no perfect diagnostic solution. Because different vehicle models have different numbers of LED bulbs, resulting in different LED power ratings, the body control system cannot use a fixed method to diagnose halogen lamp faults in the turn signal combination. For example, for vehicles with 21W halogen lamps for the left and right front turn signals and 10W LED lamps for the left and right rear turn signals, the body control system sets a drive current of 1A as the fault diagnosis threshold; that is, if the current is below 1A, the 21W halogen lamp in the turn signal combination is considered faulty. However, for vehicles with 21W halogen lamps for the left and right front turn signals and 20W LED lamps for the left and right rear turn signals, the body control system cannot set a fault diagnosis threshold of 1A anymore, because the load current of LED lamps is greater than 1A, and even if the 21W halogen lamp malfunctions, the drive current will not drop below 1A. In this situation, the body controller software must be modified to adapt to the changes in different vehicle models, which leads to increased development time and costs, and also makes version management of the body controller software difficult. Summary of the Invention

[0005] This application provides a method, device, and storage medium for diagnosing vehicle turn signal malfunctions, which can solve the problem that existing turn signal malfunction diagnosis schemes cannot be applied to vehicle models with combination turn signals.

[0006] In a first aspect, embodiments of this application provide a method for diagnosing vehicle turn signal malfunctions, including:

[0007] Configure the light source type for the vehicle's turn signals;

[0008] Based on the light source type, determine whether to perform absolute or relative diagnostics on the vehicle's turn signals;

[0009] If the absolute diagnosis is performed on the vehicle turn signal, the first absolute load current and the second absolute load current of the vehicle turn signal are obtained, and the vehicle turn signal is determined to be faulty based on the first absolute load current and the second absolute load current.

[0010] If the relative diagnosis is performed on the vehicle turn signal, the first relative load current and the second relative load current of the vehicle turn signal are obtained, and the vehicle turn signal is determined to be faulty based on the first relative load current and the second relative load current.

[0011] Optionally, in the method for diagnosing vehicle turn signal malfunctions, the vehicle turn signal includes: a first branch unit and a second branch unit.

[0012] Optionally, in the method for diagnosing vehicle turn signal malfunctions, the light source type of the vehicle's turn signals includes: full halogen lamps and combination turn signals.

[0013] Optionally, in the method for diagnosing vehicle turn signal malfunctions, the all-halogen lamp is: both the first branch unit and the second branch unit include two halogen lamps; the combined turn signal is: both the first branch unit and the second branch unit include one LED lamp and one halogen lamp.

[0014] Optionally, in the method for diagnosing vehicle turn signal malfunctions, if the vehicle turn signal is a combination turn signal, then the absolute diagnosis is performed on the vehicle turn signal; if the vehicle turn signal is a full halogen lamp, then the relative diagnosis is performed on the vehicle turn signal.

[0015] Optionally, in the method for diagnosing vehicle turn signal malfunctions, the step of performing the absolute diagnosis on the vehicle turn signal includes:

[0016] First step: Set the absolute current threshold range;

[0017] Second step: Obtain the first absolute load current of the first branch unit and / or the second absolute load current of the second branch unit;

[0018] Third step: Compare the first absolute load current and / or the second absolute load current with the upper limit of the absolute current threshold range and the lower limit of the absolute current threshold range;

[0019] Fourth step: If the first absolute load current is higher than the upper limit of the absolute current threshold range, a short circuit fault is diagnosed in the first branch unit; if the first absolute load current is lower than the lower limit of the absolute current threshold range, an open circuit fault is diagnosed in the first branch unit; if the first absolute load current is within the absolute current threshold range, return to the second step; if the second absolute load current is higher than the upper limit of the absolute current threshold range, a short circuit fault is diagnosed in the second branch unit; if the second absolute load current is lower than the lower limit of the absolute current threshold range, an open circuit fault is diagnosed in the second branch unit; if the second absolute load current is within the absolute current threshold range, return to the second step.

[0020] Optionally, in the method for diagnosing vehicle turn signal malfunctions, the step of performing the relative diagnosis on the vehicle turn signal includes:

[0021] First step: Set a first relative voltage threshold, a second relative voltage threshold, a first relative current threshold, a second relative current threshold, and a third relative current threshold, wherein a normal zone is determined based on the first relative voltage threshold, the second relative voltage threshold, the first relative current threshold, the second relative current threshold, and the third relative current threshold;

[0022] Second step: Obtain the first relative load voltage of the first branch unit, the first relative load current corresponding to the first relative load voltage, and / or the second relative load voltage of the second branch unit, and the second relative load current corresponding to the second relative load voltage;

[0023] Third step: Compare the first relative load current and / or the second relative load current with the normal zone;

[0024] Fourth step: If the first relative load current is higher than the upper limit of the normal zone, a short circuit fault is diagnosed in the first branch unit; if the first relative load current is lower than the lower limit of the normal zone, an open circuit fault is diagnosed in the first branch unit; if the first relative load current is within the normal zone, return to the second step; if the second relative load current is higher than the upper limit of the normal zone, a short circuit fault is diagnosed in the second branch unit; if the second relative load current is lower than the lower limit of the normal zone, an open circuit fault is diagnosed in the second branch unit; if the second relative load current is within the normal zone, return to the second step.

[0025] Optionally, in the method for diagnosing vehicle turn signal malfunctions, the first branch unit includes: a vehicle left front turn signal and a vehicle left rear turn signal; the second branch unit includes: a vehicle right front turn signal and a vehicle right rear turn signal.

[0026] Optionally, in the method for diagnosing vehicle turn signal malfunctions, the first branch unit includes: a vehicle left front turn signal and a vehicle right front turn signal; the second branch unit includes: a vehicle left rear turn signal and a vehicle right rear turn signal.

[0027] Secondly, embodiments of this application also provide a diagnostic device for vehicle turn signal malfunctions, comprising:

[0028] Storage module, used to store the configured light source type of the vehicle's turn signals;

[0029] The identification module is used to determine whether to perform absolute or relative diagnosis on the vehicle's turn signals based on the light source type.

[0030] The acquisition module is used to acquire the first absolute load current and the second absolute load current of the vehicle's turn signal, or to acquire the first relative load current and the second relative load current of the vehicle's turn signal.

[0031] The comparison module is used to determine whether the vehicle turn signal is faulty based on the first absolute load current and the second absolute load current, or to determine whether the vehicle turn signal is faulty based on the first absolute load current and the second absolute load current.

[0032] Thirdly, embodiments of this application also provide a computer-readable storage medium storing at least one instruction, at least one program, code set, or instruction set, wherein the at least one instruction, the at least one program, the code set, or instruction set is loaded and executed by the processor to implement the vehicle turn signal fault diagnosis method.

[0033] The technical solution of this application has at least the following advantages:

[0034] This application first configures the light source type of the vehicle's turn signals, then selects to perform absolute or relative diagnostics based on the light source type, and diagnoses whether the vehicle's turn signals are faulty based on the different load currents obtained in the absolute or relative diagnostic modes. It can be applied to vehicle models with combination turn signals and all-halogen lamps. This application adopts an offline configuration method (configuring the light source type of the vehicle's turn signals). Without the need for frequent software changes to the body controller to adapt to changes in different vehicle models, it can easily and conveniently diagnose turn signal faults, thereby saving software development time, reducing costs, and facilitating version management of the body controller software. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a flowchart of a method for diagnosing vehicle turn signal malfunctions according to an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the safe working area for absolute diagnosis according to an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the safe working area for relative diagnosis according to an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the structure of a vehicle turn signal fault diagnosis device according to an embodiment of the present invention;

[0040] The reference numerals in the attached figures are explained as follows:

[0041] 11-Storage module, 12-Identification module, 13-Acquisition module, 14-Comparison module. Detailed Implementation

[0042] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0046] This application provides a method for diagnosing vehicle turn signal malfunctions. Please refer to [link / reference]. Figure 1 , Figure 1 This is a flowchart of a method for diagnosing vehicle turn signal malfunctions according to an embodiment of the present invention. The method for diagnosing vehicle turn signal malfunctions includes:

[0047] S10: Configure the light source type of the vehicle turn signals. Specifically, the vehicle turn signals include: a first branch unit and a second branch unit. The first branch unit includes: a left front turn signal and a left rear turn signal; the second branch unit includes: a right front turn signal and a right rear turn signal. Alternatively, the first branch unit may include: a left front turn signal and a right front turn signal; the second branch unit may include: a left rear turn signal and a right rear turn signal. This embodiment uses the example where the first branch unit includes: a left front turn signal and a left rear turn signal; and the second branch unit includes: a right front turn signal and a right rear turn signal.

[0048] Furthermore, the light source categories of the vehicle's turn signals can include: all halogen lamps, all LED lamps, and combination turn signals. Specifically, an all-halogen lamp means that both the first and second branch units include two halogen lamps; an all-halogen lamp means that both the first and second branch units include two LED lamps; and a combination turn signal means that both the first and second branch units include one LED lamp and one halogen lamp. Specifically, the light source category can be configured with four cases: 0, 1, 2, and 3. When the light source category is configured as 0, it represents an all-LED lamp configuration; when the light source category is configured as 1, it represents that the front left and front right turn signals are halogen lamps, and the rear left and rear right turn signals are LED lamps; when the light source category is configured as 2, it represents that the front left and front right turn signals are LED lamps, and the rear left and rear right turn signals are halogen lamps; and when the light source category is configured as 3, it represents an all-halogen lamp configuration. The vehicle turn signal fault diagnosis method provided in this embodiment only considers three cases: all-halogen lamps (the lamp source category is configured as 1) and combination turn signals (the lamp source category is configured as 2 or 3).

[0049] In this embodiment, it is also necessary to configure a diagnostic program start flag for the vehicle turn signals. The diagnostic program start flag for the vehicle turn signals is configured to have two states: 0 and 1. When the diagnostic program start flag for the vehicle turn signals is configured to 0, the diagnostic program for the vehicle turn signals is not started; when the diagnostic program start flag for the vehicle turn signals is configured to 1, the diagnostic program for the vehicle turn signals is started.

[0050] S20: Based on the light source category, determine whether to perform absolute or relative diagnostics on the vehicle turn signal. Specifically, when the light source category is configured as 1 or 2, absolute diagnostics are performed on the vehicle turn signal; when the light source category is configured as 3, relative diagnostics are performed on the vehicle turn signal. That is, if the vehicle turn signal is a combination turn signal, then absolute diagnostics are performed on the vehicle turn signal; if the vehicle turn signal is a full halogen lamp, then relative diagnostics are performed on the vehicle turn signal.

[0051] S30: Please refer to Figure 2 , Figure 2 This is a schematic diagram of the safe operating area for absolute diagnostics according to an embodiment of the present invention. If the absolute diagnostics is performed on the vehicle's turn signal, the first absolute load current and the second absolute load current of the vehicle's turn signal are obtained, and based on the first absolute load current and the second absolute load current, it is determined whether the vehicle's turn signal is malfunctioning. Specifically, the steps of performing the absolute diagnostics on the vehicle's turn signal include:

[0052] First step: Set the absolute current threshold range (configure the absolute current threshold range).

[0053] The second step is to obtain the first absolute load current of the first branch unit and / or the second absolute load current of the second branch unit. Alternatively, the first absolute load voltage of the first branch unit and / or the second absolute load voltage of the second branch unit can be obtained. Due to the special working principle of the combined turn signal (LED lights have constant power, so the load current threshold range is the same under different voltages), the load voltage threshold range of the first branch unit and the second branch unit can generally be considered to be 9V to 16V. Based on this, it is only necessary to compare whether the load current of the first branch unit and the second branch unit is within the absolute current threshold range. See the following third and fourth steps for details.

[0054] Third step: Compare the first absolute load current and / or the second absolute load current with the upper limit of the absolute current threshold range and the lower limit of the absolute current threshold range.

[0055] Fourth step: If the first absolute load current is higher than the upper limit of the absolute current threshold range, a short circuit fault is diagnosed in the first branch unit (the branch containing the left front turn signal and the left rear turn signal); if the first absolute load current is lower than the lower limit of the absolute current threshold range, an open circuit fault is diagnosed in the first branch unit; if the first absolute load current is within the absolute current threshold range, the process returns to the second step; if the second absolute load current is higher than the upper limit of the absolute current threshold range, a short circuit fault is diagnosed in the second branch unit (the branch containing the right front turn signal and the right rear turn signal); if the second absolute load current is lower than the lower limit of the absolute current threshold range, an open circuit fault is diagnosed in the second branch unit; if the second absolute load current is within the absolute current threshold range, the process returns to the second step. The fourth step can be understood as looking up a table in the storage module to diagnose whether the first branch unit and / or the second branch unit has a fault.

[0056] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the safe operating area for relative diagnosis according to an embodiment of the present invention. If the relative diagnosis is performed on the vehicle turn signal, the first relative load current and the second relative load current of the vehicle turn signal are obtained, and it is determined whether the vehicle turn signal is malfunctioning based on the first relative load current and the second relative load current. Specifically, the step of performing the relative diagnosis on the vehicle turn signal includes:

[0057] First step: Set a first relative voltage threshold, a second relative voltage threshold, a first relative current threshold, a second relative current threshold, and a third relative current threshold (configure the first relative voltage threshold, the second relative voltage threshold, the first relative current threshold, the second relative current threshold, and the third relative current threshold), wherein a normal zone is determined based on the first relative voltage threshold, the second relative voltage threshold, the first relative current threshold, the second relative current threshold, and the third relative current threshold.

[0058] The second step is to obtain the first relative load voltage of the first branch unit, the first relative load current corresponding to the first relative load voltage, and / or the second relative load voltage of the second branch unit and the second relative load current corresponding to the second relative load voltage.

[0059] Third step: Compare the first relative load current and / or the second relative load current with the normal zone.

[0060] Fourth step: If the first relative load current is higher than the upper limit of the normal zone, a short circuit fault is diagnosed in the first branch unit; if the first relative load current is lower than the lower limit of the normal zone, an open circuit fault is diagnosed in the first branch unit; if the first relative load current is within the normal zone, return to the second step; if the second relative load current is higher than the upper limit of the normal zone, a short circuit fault is diagnosed in the second branch unit; if the second relative load current is lower than the lower limit of the normal zone, an open circuit fault is diagnosed in the second branch unit; if the second relative load current is within the normal zone, return to the second step. The fourth step can be understood as looking up a table in the storage module to diagnose whether the first branch unit and / or the second branch unit has a fault, due to the special operation of the all-halogen lamp. The principle (halogen lamps are characterized by power (current) increasing with voltage, thus the current threshold varies at different voltages) is as follows: the first relative voltage threshold and the second relative voltage threshold (relative voltage threshold range) of the first branch unit and the second branch unit are variable, and the first relative voltage threshold, the second relative voltage threshold, the first relative current threshold, the second relative current threshold, and the third relative current threshold form a trapezoidal normal zone. For example, when the first relative load voltage of the first branch unit is equal to the second relative voltage threshold, the first relative load current of the first branch unit is located within the range formed by the second relative current threshold (lower limit) and the third relative current threshold (upper limit), indicating that the first branch unit has not failed; the table lookup diagnosis for the second branch unit is similar.

[0061] Preferably, the configuration items such as the light source type of the vehicle turn signal, the diagnostic program start flag of the vehicle turn signal, the absolute current threshold range, the first relative voltage threshold, the second relative voltage threshold, the first relative current threshold, the second relative current threshold, and the third relative current threshold can be configured in advance and stored in the storage module of the diagnostic device.

[0062] This application adopts an offline configuration method (configuring the light source type of the vehicle turn signal, the diagnostic program start flag of the vehicle turn signal, the absolute current threshold range, the first relative voltage threshold, the second relative voltage threshold, the first relative current threshold, the second relative current threshold, and the third relative current threshold). When the body controller does not need to frequently change the software to adapt to the changes of different vehicle models, it is only necessary to change the offline configuration according to the vehicle model. This can easily and conveniently realize the diagnosis of turn signal faults, thereby greatly improving the platformization of the software, saving software development time, reducing costs, and also facilitating the version management of the body controller software.

[0063] Based on the same inventive concept, this application also provides a diagnostic device for vehicle turn signal malfunctions. Please refer to [link / reference]. Figure 4 , Figure 4 This is a schematic diagram of the structure of a vehicle turn signal fault diagnosis device according to an embodiment of the present invention. The vehicle turn signal fault diagnosis device includes: a storage module 11, an identification module 12, an acquisition module 13, and a comparison module 14.

[0064] The storage module 11 is used to store the light source type of the configured vehicle turn signals; the identification module 12 is used to determine whether to perform absolute or relative diagnosis on the vehicle turn signals based on the light source type; the acquisition module 13 is used to acquire the first absolute load current and the second absolute load current of the vehicle turn signals, or to acquire the first relative load current and the second relative load current of the vehicle turn signals; the comparison module 14 is used to determine whether the vehicle turn signals are malfunctioning based on the first absolute load current and the second absolute load current, or to determine whether the vehicle turn signals are malfunctioning based on the first absolute load current and the second absolute load current.

[0065] Based on the same inventive concept, embodiments of this application also provide a computer-readable storage medium storing at least one instruction, at least one program, code set, or instruction set, wherein the at least one instruction, the at least one program, the code set, or instruction set is loaded and executed by the processor to implement the vehicle turn signal fault diagnosis method.

[0066] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. A method for diagnosing vehicle turn signal malfunctions, characterized in that, include: The light source categories for vehicle turn signals are configured, wherein the vehicle turn signals include: a first branch unit and a second branch unit; the light source categories for vehicle turn signals include: all-halogen lamps and combination turn signals, wherein the all-halogen lamps are: both the first branch unit and the second branch unit include two halogen lamps; the combination turn signals are: both the first branch unit and the second branch unit include one LED lamp and one halogen lamp; If the vehicle turn signal is a combination turn signal, then an absolute diagnosis is performed on the vehicle turn signal; if the vehicle turn signal is a full halogen lamp, then a relative diagnosis is performed on the vehicle turn signal. If the absolute diagnosis is performed on the vehicle turn signal, the first absolute load current and the second absolute load current of the vehicle turn signal are obtained, and the vehicle turn signal is determined to be faulty based on the first absolute load current and the second absolute load current. If the relative diagnosis is performed on the vehicle turn signal, the first relative load current and the second relative load current of the vehicle turn signal are obtained, and the vehicle turn signal is determined to be faulty based on the first relative load current and the second relative load current. The step of performing the absolute diagnostic on the vehicle's turn signals includes: First step: Set the absolute current threshold range; Second step: Obtain the first absolute load current of the first branch unit and / or the second absolute load current of the second branch unit; Third step: Compare the first absolute load current and / or the second absolute load current with the upper limit of the absolute current threshold range and the lower limit of the absolute current threshold range; Fourth step: If the first absolute load current is higher than the upper limit of the absolute current threshold range, a short circuit fault is diagnosed in the first branch unit; if the first absolute load current is lower than the lower limit of the absolute current threshold range, an open circuit fault is diagnosed in the first branch unit; if the first absolute load current is within the absolute current threshold range, return to the second step; if the second absolute load current is higher than the upper limit of the absolute current threshold range, a short circuit fault is diagnosed in the second branch unit; if the second absolute load current is lower than the lower limit of the absolute current threshold range, an open circuit fault is diagnosed in the second branch unit; if the second absolute load current is within the absolute current threshold range, return to the second step.

2. The method for diagnosing vehicle turn signal malfunctions according to claim 1, characterized in that, The step of performing the relative diagnostic on the vehicle's turn signals includes: First step: Set a first relative voltage threshold, a second relative voltage threshold, a first relative current threshold, a second relative current threshold, and a third relative current threshold, wherein a normal zone is determined based on the first relative voltage threshold, the second relative voltage threshold, the first relative current threshold, the second relative current threshold, and the third relative current threshold; Second step: Obtain the first relative load voltage of the first branch unit, the first relative load current corresponding to the first relative load voltage, and / or the second relative load voltage of the second branch unit, and the second relative load current corresponding to the second relative load voltage; Third step: Compare the first relative load current and / or the second relative load current with the normal zone; Fourth step: If the first relative load current is higher than the upper limit of the normal zone, a short circuit fault is diagnosed in the first branch unit; if the first relative load current is lower than the lower limit of the normal zone, an open circuit fault is diagnosed in the first branch unit; if the first relative load current is within the normal zone, return to the second step; if the second relative load current is higher than the upper limit of the normal zone, a short circuit fault is diagnosed in the second branch unit; if the second relative load current is lower than the lower limit of the normal zone, an open circuit fault is diagnosed in the second branch unit; if the second relative load current is within the normal zone, return to the second step.

3. The method for diagnosing vehicle turn signal malfunctions according to claim 1 or 2, characterized in that, The first branch unit includes: a vehicle's left front turn signal and a vehicle's left rear turn signal; the second branch unit includes: a vehicle's right front turn signal and a vehicle's right rear turn signal.

4. The method for diagnosing vehicle turn signal malfunctions according to claim 1 or 2, characterized in that, The first branch unit includes: a vehicle's left front turn signal and a vehicle's right front turn signal; the second branch unit includes: a vehicle's left rear turn signal and a vehicle's right rear turn signal.

5. A diagnostic device for vehicle turn signal malfunctions, characterized in that, include: A storage module is used to store the light source categories of the configured vehicle turn signals, wherein the vehicle turn signals include: a first branch unit and a second branch unit; the light source categories of the vehicle turn signals include: all-halogen lamps and combination turn signals, wherein the all-halogen lamps are: both the first branch unit and the second branch unit include two halogen lamps; the combination turn signals are: both the first branch unit and the second branch unit include one LED lamp and one halogen lamp; The identification module is used to determine whether to perform absolute or relative diagnosis on the vehicle turn signal based on the light source type. If the vehicle turn signal is the combination turn signal, then the absolute diagnosis is performed on the vehicle turn signal; if the vehicle turn signal is the all-halogen lamp, then the relative diagnosis is performed on the vehicle turn signal. The acquisition module is used to acquire the first absolute load current and the second absolute load current of the vehicle's turn signal, or to acquire the first relative load current and the second relative load current of the vehicle's turn signal. The comparison module is used to determine whether the vehicle turn signal is malfunctioning based on the first absolute load current and the second absolute load current, or to determine whether the vehicle turn signal is malfunctioning based on the first relative load current and the second relative load current. The step of performing the absolute diagnostic on the vehicle's turn signals includes: First step: Set the absolute current threshold range; Second step: Obtain the first absolute load current of the first branch unit and / or the second absolute load current of the second branch unit; Third step: Compare the first absolute load current and / or the second absolute load current with the upper limit of the absolute current threshold range and the lower limit of the absolute current threshold range; Fourth step: If the first absolute load current is higher than the upper limit of the absolute current threshold range, a short circuit fault is diagnosed in the first branch unit; if the first absolute load current is lower than the lower limit of the absolute current threshold range, an open circuit fault is diagnosed in the first branch unit; if the first absolute load current is within the absolute current threshold range, return to the second step; if the second absolute load current is higher than the upper limit of the absolute current threshold range, a short circuit fault is diagnosed in the second branch unit; if the second absolute load current is lower than the lower limit of the absolute current threshold range, an open circuit fault is diagnosed in the second branch unit; if the second absolute load current is within the absolute current threshold range, return to the second step.

6. A computer-readable storage medium, characterized in that, The storage medium stores at least one instruction, at least one program, code set, or instruction set, wherein the at least one instruction, the at least one program, the code set, or instruction set is loaded and executed by a processor to implement the diagnostic method for vehicle turn signal malfunctions as described in any one of claims 1 to 4.

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