Steering lamp fault detection circuit, system and method
By designing a fault detection circuit for LED turn signals, using signal acquisition and transmission branch to acquire the operating status signal of the turn signals, the problem of low fault detection accuracy when a single or a single group of LEDs in the LED turn signals is solved, and the problem of low fault detection accuracy is achieved. Higher fault detection accuracy and reliability.
Patent Information
- Application Number
- CN202411325428.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-02-07
AI Technical Summary
In LED turn signals, when a single or single group of LEDs fails, the current changes are small, making it difficult to accurately determine whether the LED is faulty through current detection, resulting in low fault detection accuracy.
A turn signal fault detection circuit including a controller and a detection circuit is designed. Through the signal acquisition branch and signal transmission branch, the operating status signal of the turn signal is collected and transmitted. The controller judges whether the turn signal is faulty based on the power supply signal and the detection signal. .
It improves the accuracy of turn signal fault detection, and can accurately judge faults when a single or single group of LEDs fail, enhancing the reliability of fault detection.
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Figure CN119395594A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of turn signal lamp fault detection, and in particular to a turn signal lamp fault detection circuit, system and method. Background Art
[0002] With the popularization of LED light sources in signal lights, more and more turn signals use LED light sources. Combined with the needs of styling, the light-emitting surface has changed from the single shape of the halogen bulb period to various irregular shapes, such as thin strips, polygons, horizontal and vertical staggered, etc. Regulations require that turn signals need to be detected and reported when a fault occurs. In the past, traditional halogen bulb light sources had a large load current during normal operation, and the circuit was open and non-conductive after the bulb failed. This can be achieved by detecting the turn signal current. However, for LED circuits, especially when there are a large number of LEDs, when a single or a single group of LEDs fails, the current changes little, and it is impossible to accurately determine whether the LED is faulty through current detection. Therefore, when a single or a single group of LEDs fails, how to improve the accuracy of fault detection becomes an urgent problem to be solved. Summary of the invention
[0003] Based on this, it is necessary to provide a turn signal fault detection circuit, system and method to address the above technical issues, so as to solve the problem of how to improve the accuracy of fault detection when a single LED or a single group of LEDs fails.
[0004] A first aspect of an embodiment of the present application provides a turn signal fault detection circuit, comprising a controller and a detection circuit, wherein a power supply signal output end of the controller is used to connect to an input end of a turn signal circuit to control the turn signal to light up and turn off; The detection circuit includes a signal collection branch and a signal transmission branch, the output end of the signal transmission branch is connected to the detection signal input end of the controller, the first input end of the signal transmission branch is connected to the input end of the turn signal circuit, and the second input end of the signal transmission branch is connected to the output end of the signal collection branch; The input end of the signal acquisition branch is used to acquire the operating state of the turn signal in the turn signal circuit, so that when the operating state is acquired to be abnormal, the detection signal input end of the controller maintains a fixed voltage signal, and when the operating state is acquired to be normal, the signal at the detection signal input end of the controller follows the signal change output by the power supply signal output end; The controller is used to obtain the detection result of the turn signal according to the signal output by the power supply signal output terminal and the signal input by the detection signal input terminal.
[0005] A second aspect of the embodiment of the present application provides a turn signal fault detection system, including a turn signal circuit and the turn signal fault detection circuit described in the first aspect above; The input end of the turn signal circuit is connected to the power supply signal output end of the controller and the input end of the signal acquisition branch; The output end of the turn signal lamp circuit is grounded.
[0006] A third aspect of an embodiment of the present application provides a method for detecting a turn signal failure, the method comprising: Output power supply signal to control the turning lights on and off; Collecting a detection signal corresponding to the operating state of the turn signal, wherein a fixed voltage signal is collected when the operating state is abnormal, and a signal collected changes with the power supply signal when the operating state is normal; A detection result of the turn signal is obtained according to the power supply signal and the detection signal.
[0007] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a turn signal fault detection circuit, comprising a controller and a detection circuit, wherein the power supply signal output end of the controller is used to connect the input end of the turn signal circuit to control the turn signal to light up and go out, the detection circuit comprises a signal acquisition branch and a signal transmission branch, the output end of the signal transmission branch is connected to the detection signal input end of the controller, the first input end of the signal transmission branch is connected to the input end of the turn signal circuit, the second input end of the signal transmission branch is connected to the output end of the signal acquisition branch, the input end of the signal acquisition branch is used to collect the operating state of the turn signal in the turn signal circuit, so that when the operating state is collected to be abnormal, the detection signal input end of the controller maintains a fixed voltage signal, and when the operating state is collected to be normal, the signal of the detection signal input end of the controller follows the signal output from the power supply signal output end, and the controller is used to obtain the detection result of the turn signal according to the signal output from the power supply signal output end and the signal input from the detection signal input end. In the present application, whether the turn signal is faulty is detected by the turn signal fault detection circuit, during detection, valid data in the detection circuit can be extracted, and the corresponding valid data can be used to determine whether there is a fault, thereby improving the accuracy of turn signal fault detection. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.
[0009] Figure 1 is a structural schematic diagram of a turn signal fault detection circuit provided by Embodiment 1 of the present invention; Figure 2is a circuit structure diagram of a detection signal input terminal of a controller provided in Embodiment 2 of the present invention; Figure 3 is a circuit structure diagram of a signal transmission branch provided in Embodiment 3 of the present invention; Figure 4 This is a structural diagram of a turn signal fault detection system provided by Embodiment 4 of the present invention; Figure 5 This is a structural diagram of a turn signal fault detection system provided by Embodiment 5 of the present invention; Figure 6 This is a structural diagram of a turn signal fault detection system provided by Embodiment 6 of the present invention; Figure 7 It is a flow chart of a method for detecting a turn signal failure provided in Embodiment 7 of the present invention. DETAILED DESCRIPTION
[0010] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0011] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.
[0012] It should also be understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
[0013] As used in the present specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]", depending on the context.
[0014] In addition, in the description of the present specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.
[0015] References to "one embodiment" or "some embodiments" etc. described in the present specification mean that one or more embodiments of the present invention include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.
[0016] It should be understood that the order of execution of the steps in the following embodiments does not imply a precedence of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
[0017] In order to illustrate the technical solution of the present invention, specific embodiments are provided below for illustration.
[0018] See also Figure 1 , is a schematic diagram of a turn signal fault detection circuit provided by Embodiment 1 of the present invention, such as Figure 1 As shown, it includes a controller and a detection circuit, and the power supply signal output end of the controller is used to connect the input end of the turn signal circuit to control the turn signal to light up and turn off; The detection circuit includes a signal acquisition branch and a signal transmission branch. The output end of the signal transmission branch is connected to the detection signal input end of the controller, the first input end of the signal transmission branch is connected to the input end of the turn signal circuit, and the second input end of the signal transmission branch is connected to the output end of the signal acquisition branch.
[0019] The input end of the signal acquisition branch is used to collect the operating status of the turn signal in the turn signal circuit, so that when the operating status is collected to be abnormal, the detection signal input end of the controller maintains a fixed voltage signal, and when the operating status is collected to be normal, the signal at the detection signal input end of the controller follows the signal change output by the power supply signal output end.
[0020] The controller is used to obtain the detection result of the turn signal according to the signal output from the power supply signal output terminal and the signal input from the detection signal input terminal.
[0021] In this embodiment, the turn signal fault detection circuit includes a controller and a detection circuit. The power supply signal output end of the controller is used to connect the input end of the turn signal circuit to control the turning signal to turn on and off, wherein the turn signal circuit includes a single or multiple turn signals.
[0022] The detection circuit includes a signal acquisition branch and a signal transmission branch. The output end of the signal transmission branch is connected to the detection signal input end of the controller, the first input end of the signal transmission branch is connected to the input end of the turn signal circuit, and the second input end of the signal transmission branch is connected to the output end of the signal acquisition branch.
[0023] The input end of the signal acquisition branch is used to collect the operating status of the turn signal in the turn signal circuit, so that when the operating status is collected to be abnormal, the detection signal input end of the controller maintains a fixed voltage signal, and when the operating status is collected to be normal, the signal at the detection signal input end of the controller follows the signal change output by the power supply signal output end.
[0024] For example, if the signal acquisition branch detects that the operating status of the turn signal in the turn signal circuit is normal, the signal that the operating status is normal is transmitted to the detection signal input end of the controller through the signal transmission branch, and the controller powers the turn signal circuit based on the signal that the operating status is normal detected by the detection signal input end.
[0025] It should be noted that when the power supply signal output end of the controller supplies power to the turn signal circuit, the power supply voltage signal is a periodic signal. When the operating state of the turn signal in the turn signal circuit is normal, the signal at the output end of the signal transmission branch follows the signal change output from the power supply signal output end and changes periodically. For example, if the signal output from the power supply signal output end is high, the signal at the output end of the signal transmission branch is low; or, if the signal output from the power supply signal output end is low, the signal at the output end of the signal transmission branch is high, etc. The signal at the output end of the signal transmission branch follows the signal change output from the power supply signal output end and can be determined based on the actual detection circuit.
[0026] The controller is used to obtain the detection result of the turn signal according to the signal output from the power supply signal output end and the signal input from the detection signal input end. If the relationship between the signal output from the power supply signal output end and the signal input from the detection signal input end is a preset logical relationship, the detection result of the turn signal is considered to be fault-free, and if the relationship between the signal output from the power supply signal output end and the signal input from the detection signal input end is not a preset logical relationship, the detection result of the turn signal is considered to be faulty. For example, if the preset logical relationship between the signal output from the power supply signal output end and the signal input from the detection signal input end is that when the signal output from the power supply signal output end is high, the signal input from the detection signal input end is low, and when the signal output from the power supply signal output end is low, the signal input from the detection signal input end is high, when the relationship between the signal output from the power supply signal output end and the signal input from the detection signal input end satisfies the preset logical relationship, the detection result of the turn signal is obtained to be fault-free. When the relationship between the signal output from the power supply signal output end and the signal input from the detection signal input end does not satisfy the preset logical relationship, the detection result of the turn signal is obtained to be faulty.
[0027] See also Figure 2 , is a circuit structure diagram of a detection signal input end of a controller provided in Embodiment 2 of the present invention. The detection signal input end of the controller includes a power supply, a first microcontroller, a feedback pin and a first transistor; the power supply is connected to the collector of the first transistor, and the emitter of the first transistor is connected to the feedback pin, so that the power supply outputs a voltage signal for the feedback pin through the conduction of the first transistor; the input end of the first microcontroller is connected to the feedback pin, and the output end of the first microcontroller is connected to the collector of the first transistor. The first microcontroller controls the first transistor to be turned on when the operating state of the turn signal circuit is abnormal.
[0028] In this embodiment, the output end of the signal transmission branch is connected to the detection signal input end of the controller, and the operating status signal of the turn signal in the turn signal circuit collected by the signal collection branch is transmitted to the detection signal input end of the controller. When the operating status signal is a signal of normal operation, the first microcontroller controls the first transistor to conduct, collects the voltage signal of the feedback pin, and the feedback pin feeds back the corresponding voltage signal to the controller, and the relationship between the voltage signal and the signal output from the power supply signal output terminal meets the preset logical relationship. When the operating status signal is a signal of abnormal operation, that is, the turn signal fails, the first microcontroller controls the first transistor to conduct, collects the voltage signal of the feedback pin, and the feedback pin feeds back the corresponding voltage signal to the controller, and the relationship between the voltage signal and the signal output from the power supply signal output terminal does not meet the preset logical relationship.
[0029] It should be noted that the detection signal input end of the controller also includes a resistor R1 and a resistor R2, the resistor R1 is connected between the first microcontroller and the feedback pin, the resistor R2 is connected between the first transistor and the feedback pin, and the feedback pin is grounded.
[0030] See also Figure 3 , is a circuit structure diagram of a signal transmission branch provided in Embodiment 3 of the present invention, the signal transmission branch includes a second triode; the collector of the second triode is respectively connected to the input end of the turn signal circuit and the output end of the signal acquisition branch, the collector of the second triode is connected to the detection signal input end of the controller, and the emitter of the second triode is grounded; the signal acquisition branch controls the second triode to be cut off when the operating state of the turn signal circuit is abnormal.
[0031] In this embodiment, the signal acquisition branch includes a second microcontroller, which is used to collect the operating status of the turn signal in the turn signal circuit. When the operating status is abnormal, the second transistor is controlled to be cut off, so that the signal output from the power supply signal output end of the controller flows to the second microcontroller, and the second microcontroller is grounded.
[0032] It should be noted that when the operating state is abnormal, that is, when the turn signal lamp is faulty, the second microcontroller controls the second transistor to be cut off, so that the signal in the feedback pin in the detection signal input terminal of the controller cannot be grounded through the second transistor. Therefore, the voltage signal of the feedback pin is different from the voltage signal when the operating state is normal, and the voltage signal of the feedback pin is maintained at a fixed voltage signal. Therefore, the detection result of the turn signal lamp can be obtained according to the signal output from the power supply signal output terminal and the signal input from the detection signal input terminal.
[0033] It should be noted that when the operation state is normal, if the output signal of the power supply signal output end of the controller is high, the power supply signal output end of the controller is used to supply power to the turn signal circuit, the second microcontroller controls the second transistor to be turned on, and the current in the detection signal input end of the controller is grounded through the second transistor, and the voltage signal of the feedback pin collected is low. If the output signal of the power supply signal output end of the controller is grounded, when the turn signal is normally off, the second microcontroller controls the second transistor to be cut off, so that the signal in the feedback pin in the detection signal input end of the controller cannot be grounded through the second transistor. At this time, the signal in the feedback pin in the detection signal input end of the controller is high. Therefore, when the operation state is normal, the signal of the detection signal input end of the controller follows the signal output from the power supply signal output end. When the signal output from the power supply signal output end is high, the signal at the detection signal input end is low, and when the signal output from the power supply signal output end is low, the signal at the detection signal input end is high. Therefore, when the turn signal operating state is normal, the logical relationship between the signal output from the power supply signal output terminal and the signal input from the detection signal input terminal is different from the logical relationship between the signal output from the power supply signal output terminal and the signal input from the detection signal input terminal when the turn signal operating state is abnormal.
[0034] It should be noted that the emitter of the second triode may also be connected to a resistor R3, so that the voltage signal flowing through the second triode is reduced by the resistor R3.
[0035] It should be noted that the second input end of the signal transmission branch can also be connected to resistor R4, so that when the operating status of the turn signal in the turn signal circuit is abnormal, the signal acquisition branch can collect a higher signal, making it easy for the signal acquisition branch to obtain the operating status of the turn signal in the turn signal circuit.
[0036] See also Figure 4 , is a structural diagram of a turn signal fault detection system provided in Embodiment 4 of the present invention, including a turn signal circuit and a turn signal fault detection circuit; the input end of the turn signal circuit is connected to the power supply signal output end of the controller and the input end of the signal acquisition branch, and the output end of the turn signal circuit is grounded.
[0037] See also Figure 5, is a structural diagram of a turn signal fault detection system provided in Embodiment 5 of the present invention, comprising: the detection signal input end of the controller includes a power supply, a first microcontroller, a feedback pin and a first transistor; the power supply is connected to the collector of the first transistor, and the emitter of the first transistor is connected to the feedback pin, so that the power supply outputs a voltage signal for the feedback pin through the conduction of the first transistor; the input end of the first microcontroller is connected to the feedback pin, and the output end of the first microcontroller is connected to the collector of the first transistor, and the first microcontroller controls the first transistor to be turned on when the operating state of the turn signal circuit is abnormal.
[0038] The signal transmission branch includes a second transistor; the collector of the second transistor is respectively connected to the input end of the turn signal circuit and the output end of the signal acquisition branch, the collector of the second transistor is connected to the detection signal input end of the controller, and the emitter of the second transistor is grounded. The signal acquisition branch controls the second transistor to be cut off when the operating state of the turn signal circuit is abnormal.
[0039] See also Figure 6 , is a structural diagram of a turn signal fault detection system provided in Example 6 of the present invention. The turn signal circuit includes a turn signal, a filter protection circuit and a constant current module; the input end of the filter protection circuit is connected to the power supply signal output end of the controller, the output end of the filter protection circuit is connected to the input end of the constant current module and the second input end of the signal transmission branch, the input end of the constant current module is also connected to the second input end of the signal transmission branch, the output end of the constant current module is connected to the input end of the turn signal and the input end of the signal acquisition branch, and the output end of the turn signal is grounded.
[0040] In this embodiment, the filtering protection circuit is used to allow signal components within a certain frequency range to pass through the turn signal circuit normally, and the constant current module is used to ensure that the current remains constant under specific conditions and is not affected by load changes or other external factors.
[0041] The present invention provides a turn signal fault detection circuit, comprising a controller and a detection circuit, wherein the power supply signal output end of the controller is used to connect the input end of the turn signal circuit to control the turn signal to light up and go out, the detection circuit comprises a signal acquisition branch and a signal transmission branch, the output end of the signal transmission branch is connected to the detection signal input end of the controller, the first input end of the signal transmission branch is connected to the input end of the turn signal circuit, the second input end of the signal transmission branch is connected to the output end of the signal acquisition branch, the input end of the signal acquisition branch is used to collect the operating state of the turn signal in the turn signal circuit, so that when the operating state is collected to be abnormal, the detection signal input end of the controller maintains a fixed voltage signal, and when the operating state is collected to be normal, the signal of the detection signal input end of the controller follows the signal output from the power supply signal output end, and the controller is used to obtain the detection result of the turn signal according to the signal output from the power supply signal output end and the signal input from the detection signal input end. In the present application, whether the turn signal is faulty is detected by the turn signal fault detection circuit, during detection, valid data in the detection circuit can be extracted, and the corresponding valid data can be used to determine whether there is a fault, thereby improving the accuracy of turn signal fault detection.
[0042] See also Figure 7 , is a flow chart of a method for detecting a turn signal failure provided by Embodiment 7 of the present invention, such as Figure 7 As shown, the method for detecting a turn signal failure may include the following steps.
[0043] S701: Output a power supply signal to control the turning light to turn on and off.
[0044] S702: Collecting a detection signal corresponding to the operating state of the turn signal, wherein a fixed voltage signal is collected when the operating state is abnormal, and the collected signal changes with the power supply signal when the operating state is normal.
[0045] S703: Obtaining a detection result of the turn signal according to the power supply signal and the detection signal.
[0046] In this embodiment, the power supply signal output end of the controller outputs a power supply signal for controlling the turning light to turn on and off, supplies power to the turn signal circuit, and enables the turn signal in the turn signal circuit to turn on. The controller collects a detection signal corresponding to the operating status of the turn signal, that is, the signal in the feedback pin, wherein a fixed voltage signal is collected when the operating status is abnormal, and the collected signal changes with the power supply signal when the operating status is normal.
[0047] For example, when the operation state is normal, if the output signal of the power supply signal output end of the controller is high, the power supply signal output end of the controller is used to supply power to the turn signal circuit, the second microcontroller controls the second transistor to be turned on, and the current in the detection signal input end of the controller is grounded through the second transistor, and the voltage signal of the feedback pin collected is low. If the output signal of the power supply signal output end of the controller is grounded, when the turn signal is normally off, the second microcontroller controls the second transistor to be cut off, so that the signal in the feedback pin in the detection signal input end of the controller cannot be grounded through the second transistor. At this time, the signal in the feedback pin in the detection signal input end of the controller is high. Therefore, when the operation state is normal, the signal of the detection signal input end of the controller follows the signal output from the power supply signal output end. When the signal output from the power supply signal output end is high, the signal at the detection signal input end is low, and when the signal output from the power supply signal output end is low, the signal at the detection signal input end is high.
[0048] When the operating state is abnormal, the signal in the feedback pin of the detection signal input terminal of the controller cannot be grounded through the second transistor. At this time, the signal input to the detection signal input terminal is high and remains high. Therefore, when the operating state of the turn signal is normal, the logical relationship between the signal output from the power supply signal output terminal and the signal input from the detection signal input terminal is different from the logical relationship between the signal output from the power supply signal output terminal and the signal input from the detection signal input terminal when the operating state of the turn signal is abnormal.
[0049] The detection result of the turn signal is obtained according to the power supply signal and the detection signal. That is, the detection result of the turn signal is obtained according to the logical relationship between the power supply signal and the detection signal. If the signal output from the power supply signal output end is high, the signal from the detection signal input end is low, and the signal output from the power supply signal output end is low, and the signal from the detection signal input end is high, then the detection result is considered to be that the turn signal has no fault, that is, the turn signal is normal. If the signal output from the power supply signal output end is high, and the signal from the detection signal input end is high and has been high, then the detection result is considered to be that the turn signal has a fault, that is, the turn signal is abnormal.
[0050] Optionally, collecting a detection signal corresponding to the operating state of the turn signal includes: Obtaining a first start time of each signal cycle of the output power supply signal and a first delay time when collecting the detection signal; Calculate a second start time of the effective time according to the first delay duration and the first start time; Calculate the effective time according to the signal cycle and the first delay time; Determine the effective time for collecting the detection signal according to the length of the effective time and the second start time; The detection signal corresponding to the operating status of the turn signal is collected within the effective time.
[0051] In this embodiment, since the turn signal needs to be initialized at a corresponding time, in order to prevent false alarm of the abnormality of the turn signal in the turn signal circuit, the corresponding effective time is determined, that is, the signal detected within the effective time is obtained, and the signal output from the power supply signal output end and the signal input from the detection signal input end are detected within the effective time. It is judged whether the turn signal in the turn signal circuit is abnormal.
[0052] When determining the effective time, the first start time of each signal cycle of the output power supply signal and the first delay time when collecting the detection signal are obtained. According to the first delay time and the first start time, the second start time of the effective time is calculated, that is, the first start time plus the first delay time, and the corresponding time is the second start time. According to the signal cycle and the first delay time, the effective time is calculated, where the effective time calculation formula is as follows: in, For each signal cycle of the output power supply signal, It is the first delay time when collecting the detection signal, that is, the delay time of collecting the signal in the feedback pin. The effective time duration range.
[0053] According to the effective time and the second start time, the effective time for collecting the detection signal is determined, that is, from the second start time to the end of the effective time, which is the corresponding effective time. The detection signal corresponding to the running state of the turn signal is collected within the effective time, that is, the signal in the feedback foot is collected within the effective time.
[0054] It should be noted that if multiple collections are required, all collections should be performed within the effective time. ,in, is the duration of each collection, The number of collections.
[0055] It should be noted that after the corresponding detection signal is collected, it is also necessary to determine whether the detection signal is valid. If the corresponding detection signal collected each time is a high signal, the detection signal is considered to be a high signal. If the corresponding detection signal collected each time is a low signal, the detection signal is considered to be a low signal. If the detection signal collected is sometimes high and sometimes low, the detection signal is considered to be an invalid signal.
[0056] After determining that the collected detection signals are all valid signals, a logical comparison is performed on the power supply signal and the detection signal to obtain the detection result of the turn signal.
Claims
1. A turn signal fault detection circuit, characterized in that: It includes a controller and a detection circuit, wherein the power supply signal output end of the controller is used to connect the input end of the turn signal circuit to control the turn signal to light up and turn off; The detection circuit includes a signal collection branch and a signal transmission branch, the output end of the signal transmission branch is connected to the detection signal input end of the controller, the first input end of the signal transmission branch is connected to the input end of the turn signal circuit, and the second input end of the signal transmission branch is connected to the output end of the signal collection branch; The input end of the signal acquisition branch is used to acquire the operating state of the turn signal in the turn signal circuit, so that when the operating state is acquired to be abnormal, the detection signal input end of the controller maintains a fixed voltage signal, and when the operating state is acquired to be normal, the signal at the detection signal input end of the controller follows the signal change output by the power supply signal output end; The controller is used to obtain the detection result of the turn signal according to the signal output by the power supply signal output terminal and the signal input by the detection signal input terminal.
2. The turn signal fault detection circuit according to claim 1, characterized in that: The detection signal input end of the controller includes a power supply, a first microcontroller, a feedback pin and a first transistor; The power supply is connected to the collector of the first transistor, and the emitter of the first transistor is connected to the feedback pin, so that the power supply outputs a voltage signal to the feedback pin through the conduction of the first transistor; The input end of the first microcontroller is connected to the feedback pin, the output end of the first microcontroller is connected to the collector of the first transistor, and the first microcontroller controls the first transistor to be turned on when the operating state of the turn signal circuit is abnormal.
3. The turn signal fault detection circuit according to claim 1, characterized in that: The signal transmission branch includes a second triode; The collector of the second transistor is connected to the input end of the turn signal circuit and the output end of the signal acquisition branch respectively, the collector of the second transistor is connected to the detection signal input end of the controller, and the emitter of the second transistor is grounded; The signal acquisition branch controls the second transistor to be cut off when the operating state of the turn signal circuit is abnormal.
4. A turn signal fault detection system, characterized in that: It comprises a turn signal circuit and a turn signal fault detection circuit as claimed in any one of claims 1 to 3; The input end of the turn signal circuit is connected to the power supply signal output end of the controller and the input end of the signal acquisition branch; The output end of the turn signal lamp circuit is grounded.
5. The turn signal fault detection system according to claim 4, characterized in that: The turn signal fault detection circuit comprises a controller and a detection circuit, wherein the power supply signal output end of the controller is used to connect the input end of the turn signal circuit to control the turn signal to light up and turn off; The detection circuit includes a signal collection branch and a signal transmission branch, the output end of the signal transmission branch is connected to the detection signal input end of the controller, the first input end of the signal transmission branch is connected to the input end of the turn signal circuit, and the second input end of the signal transmission branch is connected to the output end of the signal collection branch; The input end of the signal acquisition branch is used to acquire the operating state of the turn signal in the turn signal circuit, so that when the operating state is acquired to be abnormal, the detection signal input end of the controller maintains a fixed voltage signal, and when the operating state is acquired to be normal, the signal at the detection signal input end of the controller follows the signal change output by the power supply signal output end; The controller is used to obtain the detection result of the turn signal according to the signal output by the power supply signal output terminal and the signal input by the detection signal input terminal.
6. The turn signal fault detection system according to claim 5, characterized in that: The detection signal input end of the controller includes a power supply, a first microcontroller, a feedback pin and a first transistor; The power supply is connected to the collector of the first transistor, and the emitter of the first transistor is connected to the feedback pin, so that the power supply outputs a voltage signal to the feedback pin through the conduction of the first transistor; The input end of the first microcontroller is connected to the feedback pin, the output end of the first microcontroller is connected to the collector of the first transistor, and the first microcontroller controls the first transistor to be turned on when the operating state of the turn signal circuit is abnormal.
7. The turn signal fault detection system according to claim 5, characterized in that: The signal transmission branch includes a second triode; The collector of the second transistor is connected to the input end of the turn signal circuit and the output end of the signal acquisition branch respectively, the collector of the second transistor is connected to the detection signal input end of the controller, and the emitter of the second transistor is grounded; The signal acquisition branch controls the second transistor to be cut off when the operating state of the turn signal circuit is abnormal.
8. The turn signal fault detection system according to claim 4, characterized in that: The turn signal circuit includes a turn signal, a filter protection circuit and a constant current module; The input end of the filtering protection circuit is connected to the power supply signal output end of the controller, the output end of the filtering protection circuit is connected to the input end of the constant current module and the second input end of the signal transmission branch, the output end of the constant current module is connected to the input end of the turn signal and the input end of the signal acquisition branch, and the output end of the turn signal is grounded.
9. A method for detecting a turn signal failure, characterized in that: The detection method comprises: Output power supply signal to control the turning lights on and off; Collecting a detection signal corresponding to the operating state of the turn signal, wherein a fixed voltage signal is collected when the operating state is abnormal, and a signal collected changes with the power supply signal when the operating state is normal; A detection result of the turn signal is obtained according to the power supply signal and the detection signal.
10. The method for detecting turn signal failure according to claim 1, characterized in that: The collecting of the detection signal corresponding to the operating state of the turn signal includes: Obtaining a first start time of each signal cycle of outputting the power supply signal and a first delay time when collecting a detection signal; Calculate a second start time of the valid time according to the first delay duration and the first start time; Calculating the duration of the effective time according to the signal period and the first delay duration; Determine the effective time for collecting the detection signal according to the duration of the effective time and the second start time; A detection signal corresponding to the operating state of the turn signal lamp is collected within the effective time.