Brake lamp working state monitoring system and method and vehicle

Abstract

The invention discloses a brake lamp working state monitoring system and method and a vehicle, and belongs to the technical field of brake lamp detection for motor vehicles, and the system comprises a photoelectric conversion module which is used for converting a light signal emitted by a brake lamp into an electric signal; the signal acquisition and processing module is used for receiving the electric signal output by the photoelectric conversion module and amplifying and adjusting the electric signal; the LIN bus module is used for receiving the signal output by the signal acquisition and processing module, further processing the signal and then sending the signal to a vehicle bus; and the instrument display module is used for receiving the signal from the LIN bus module and converting the signal into prompt information so as to display the working state of the brake lamp on an instrument panel. The method is convenient in detection, is not limited by environmental factors, achieves the early warning and timely processing of the fault of the brake lamp, improves the driving safety, and reduces the maintenance cost and time cost caused by the fault of the brake lamp.

Description

Technical Field

[0001] The present invention relates to the technical field of brake light detection for motor vehicles, and more specifically, to a brake light working state monitoring system, method and vehicle. Background Art

[0002] With the continuous improvement of road traffic conditions and the rapid growth of the number of cars, the number of vehicles on the road is increasing, resulting in frequent rear-end collisions. Such accidents are often closely related to the driver's reaction speed to the driving status of the vehicle in front. In order to ensure driving safety, the driver needs to be able to respond quickly to the sudden deceleration of the vehicle in front. Brake lights are an important tool for transmitting traffic information during driving. Their normal lighting is crucial for the rear driver to judge the status of the vehicle in front. If the brake lights do not work properly, it may cause the rear driver to make a wrong judgment, thus causing a traffic accident. Therefore, ensuring the normal operation of brake lights has become one of the basic requirements for safe driving of cars, and testing brake lights has become an important measure to provide safe driving guarantees.

[0003] At present, most domestic vehicles have insufficient detection of headlights, especially the damage of the rear brake lights is often difficult to detect, which brings safety hazards to drivers. For the detection of brake light failure, the main methods currently used are still relatively traditional, including asking other people to observe whether the brake lights are working properly behind the vehicle, or in a dimly lit environment, the rear of the vehicle is close to the rear obstacle to determine whether there is a fault by observing the degree of lightness of the brake lights.

[0004] Existing methods need to rely on the assistance of other people or be carried out in specific environments, which is not convenient and fast enough. Drivers cannot test the brake lights anytime and anywhere, which has certain limitations. Observing the brightness of the brake lights in a dimly lit environment to judge the fault is easily affected by various factors such as ambient light and obstacle distance, resulting in inaccurate judgment results. Existing methods lack automated and intelligent detection methods and cannot achieve real-time monitoring and early warning of brake light faults. Summary of the invention

[0005] An object of the present invention is to provide a brake light working status monitoring system, method and vehicle to solve the aforementioned problem that most vehicles lack detection of headlights, and the problem that existing manual detection methods for brake lights are not convenient enough and are easily subject to environmental factors.

[0006] According to a first aspect of the present invention, there is provided a brake light operating state monitoring system, comprising:

[0007] A photoelectric conversion module, used to convert the optical signal emitted by the brake light into an electrical signal;

[0008] A signal acquisition and processing module, used to receive the electrical signal output by the photoelectric conversion module, and amplify and adjust the electrical signal;

[0009] LIN bus module, used for receiving the signal output by the signal acquisition and processing module, further processing the signal, and then sending it to the vehicle bus;

[0010] The instrument display module is used to receive the signal from the LIN bus module and convert the signal into prompt information to display the working status of the brake light on the instrument panel.

[0011] Optionally, the photoelectric conversion module includes a photoelectric coupler, which is used to convert optical signals into electrical signals and output them to subsequent circuits.

[0012] Optionally, the photoelectric coupler includes a brake light and a phototransistor used in conjunction with the brake light. The brake light emits light when it is turned on, and the phototransistor receives the light and generates a corresponding electrical signal.

[0013] Optionally, the photoelectric conversion module further includes a filter, and the filter is used to filter out light irrelevant to the working state of the brake light.

[0014] Optionally, the signal acquisition and processing module includes:

[0015] A signal amplifying circuit, comprising an NPN transistor Q2, for amplifying the electrical signal from the photocoupler;

[0016] The signal control circuit includes a PNP transistor Q1 as a switch element for controlling the on and off of the output signal;

[0017] The regulating circuit includes a first resistor R1 and a second resistor R2. The first resistor R1 is used to adjust the amplification factor of the signal amplifying circuit. The second resistor R2 works together with the first resistor R1 to control the switching state of the PNP transistor Q1 according to the change of the input signal, thereby adjusting the output signal.

[0018] Optionally, the base of the PNP transistor Q1 receives the amplified electrical signal through the second resistor R2, and the collector of the PNP transistor Q1 outputs a control signal.

[0019] Optionally, the instrument display module receives a signal from the LIN bus module and displays the working status of the brake light on the instrument panel: when there is a problem with the brake light, the signal light displayed on the instrument is on; conversely, if the signal light is off, it means that the brake light is working normally.

[0020] Optionally, the brake light working status monitoring system further includes a voice reminder module, which is electrically connected to the LIN bus module and is used to send a sound alarm signal according to a signal sent by the LIN bus module.

[0021] According to a second aspect of the present invention, a method for monitoring the working state of a brake light is provided, comprising the following steps:

[0022] Photoelectric conversion step: used to convert the light signal emitted by the brake light into an electrical signal;

[0023] Signal acquisition and processing step: used to receive the electrical signal output by the photoelectric conversion module, and amplify and adjust the electrical signal;

[0024] LIN bus communication step: used to receive the signal output by the signal acquisition and processing module, further process the signal, and then send it to the vehicle bus;

[0025] Instrument display step: used to receive the signal from the LIN bus module and convert the signal into prompt information to display the working status of the brake light on the instrument panel.

[0026] According to a third aspect of the present invention, a vehicle is provided, comprising the above-mentioned brake light operating status monitoring system.

[0027] The brake light working state monitoring system, method and vehicle disclosed in the present invention have the following technical effects:

[0028] By directly monitoring the optical signal of the brake light through the photoelectric conversion module and its photoelectric coupler, and the photoelectric coupler includes a brake light and a photosensitive transistor used in conjunction with the brake light, the working status of the brake light can be more accurately reflected, avoiding false alarms or missed alarms caused by poor mechanical or electrical connections;

[0029] The instrument display module receives the signal from the LIN bus module and converts it into prompt information to display the working status of the brake light on the instrument panel, so that the driver can intuitively understand the working status of the brake light and take corresponding measures in time;

[0030] By monitoring the working status of the brake light in real time and displaying the information on the instrument panel, the driver can know whether the brake light is working normally in the current state by observing the instrument. The detection is convenient and not subject to environmental factors. Early warning and timely processing of brake light failures are achieved, which not only improves driving safety, but also reduces the maintenance cost and time cost caused by brake light failures. In addition, in the detection of whether the brake light of the present invention is normally lit, in addition to the circuit failure causing excessively low voltage, it is also possible to detect whether there is a problem with the bulb itself.

[0031] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0033] Figure 1 A schematic diagram of the logical structure of a brake light working state monitoring system provided by an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of the circuit structure of a signal acquisition and processing module in a brake light operating status monitoring system provided in an embodiment of the present invention.

[0035] The following are marked in the figure:

[0036] Q2, NPN transistor; Q1, PNP transistor; R1, first resistor; R2, second resistor; K1, brake switch; B1, power supply. DETAILED DESCRIPTION

[0037] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0038] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0039] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0040] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0041] At present, most vehicles in China lack the problem of detecting headlights, especially the damage of brake lights installed at the rear of the car is not easy to detect, which poses a safety hazard to the driver. Most of the detection of brake light failures remains at a low level, that is, asking other people to observe whether the brake lights are normal from the rear or in a dimly lit environment, when the rear of the car is facing the rear obstacle and gradually approaching, the degree of brightness of the light is observed to determine whether the brake lights are faulty. This application uses the photoelectric effect of phototransistors to convert optical signals into electrical signals and connect them to the LIN bus module for signal processing, and then feeds the signal back to the instrument, so as to observe whether the brake lights are working properly.

[0042] The present invention proposes an embodiment of a brake light working state monitoring system. Specifically, Figure 1 shown, including:

[0043] The photoelectric conversion module is used to convert the light signal emitted by the brake light into an electrical signal. When the brake light is on, the light emitted hits the photoelectric conversion device, and the photoelectric effect inside the device converts the light energy into electrical energy, thereby generating an electrical signal. The photoelectric conversion module monitors by receiving the light emitted by the brake light without directly contacting the brake light, thereby reducing the risk of monitoring failure due to connection line or sensor failure.

[0044] The signal acquisition and processing module is used to receive the electrical signal output by the photoelectric conversion module and amplify and adjust the electrical signal; the signal acquisition and processing module is responsible for receiving the weak electrical signal output by the photoelectric conversion module and amplifying, filtering and adjusting it, including a signal amplifier, a filter and an analog-to-digital converter. The filter can filter out high-frequency noise and interference in the signal, and the analog-to-digital converter converts the analog signal into a digital signal to facilitate subsequent digital signal processing and analysis.

[0045] The LIN bus module is used to receive the signal output by the signal acquisition and processing module, further process the signal, and then send it to the vehicle bus; the LIN bus module realizes data communication between the monitoring system and the vehicle bus, so that the working status information of the brake light can be transmitted to other control units or display devices of the vehicle in real time.

[0046] The instrument display module is used to receive signals from the LIN bus module and convert the signals into prompt information to display the working status of the brake lights on the instrument panel; the prompt information is the flashing of the indicator light, text prompts or graphic displays, etc. The instrument display module provides the driver with intuitive feedback on the working status of the brake lights through the prompt information, so that the driver can quickly understand whether the brake lights are working normally.

[0047] In the embodiment of the present invention, the photoelectric conversion module includes a photoelectric coupler, which is used to convert optical signals into electrical signals and output them to subsequent circuits. The optical signal of the brake light passes through the transparent insulating material of the photoelectric coupler and irradiates the photosensitive element. After receiving the optical signal, the internal resistance, current or voltage of the photosensitive element changes, thereby converting the optical signal into an electrical signal.

[0048] In an embodiment of the present invention, the photocoupler includes a brake light and a phototransistor used in conjunction with the brake light. The brake light emits light when it is on, and the phototransistor receives the light and generates a corresponding electrical signal. The combination of the brake light and the phototransistor achieves electrical isolation of the brake signal and reduces the impact of electrical noise and interference. Furthermore, the output end of the phototransistor is also connected to a microprocessor or a single-chip microcomputer (MCU). The MCU has a built-in fault diagnosis program that can detect potential faults in the brake system. The MCU is integrated with other automotive electronic systems (such as engine management system, body control system, etc.) through a communication interface (such as CAN bus, LIN bus, etc.) to achieve information sharing and collaborative control.

[0049] In an embodiment of the present invention, the photoelectric conversion module further includes a filter, which is used to filter out light irrelevant to the working state of the brake light. By filtering out light irrelevant to the working state of the brake light, the filter ensures that the light received by the photosensitive element is purer. This enables the system to more accurately determine the working state of the brake light, thereby improving the accuracy of the system. By selecting appropriate spectral transmittance range and transmittance / blocking rate and other parameters, the filter can optimize the sensitivity, response speed and stability of the system.

[0050] In the embodiment of the present invention, Figure 2 As shown, the signal acquisition and processing module includes:

[0051] The signal amplification circuit includes an NPN transistor Q2, which is used to amplify the electrical signal from the photocoupler; specifically, in this module, the first resistor R1 is connected to the base of the NPN transistor Q2, and the base current can be changed by adjusting the resistance value of the first resistor R1, thereby adjusting the amplification factor.

[0052] The signal control circuit includes a PNP transistor Q1 as a switching element for controlling the on and off of the output signal; specifically, the second resistor R2 is connected to the base of the PNP transistor Q1, and the sensitivity of the base current can be changed by adjusting the resistance value of the second resistor R2, thereby adjusting the threshold of the switching state.

[0053] The regulating circuit includes a first resistor R1 and a second resistor R2. The first resistor R1 is used to adjust the amplification factor of the signal amplification circuit. The second resistor R2 works together with the first resistor R1 to control the switching state of the PNP transistor Q1 according to the change of the input signal, thereby adjusting the output signal. By adjusting the resistance values ​​of the first resistor R1 and the second resistor R2, the amplification factor and the switching threshold of the signal can be flexibly adjusted, so that the module can adapt to different signal characteristics and system requirements.

[0054] Furthermore, one end of the brake light is electrically connected to the negative pole of the power supply, and the positive pole of the power supply is connected to the brake switch K1, and the power supply adopts a 12V DC power supply. When the driver steps on the brake pedal, the brake switch K1 inside the brake system is closed, thereby connecting the positive pole of the power supply to the brake light.

[0055] In the embodiment of the present invention, the base of the PNP transistor Q1 receives the amplified electrical signal through the second resistor R2, and the collector of the PNP transistor Q1 outputs the control signal.

[0056] In an embodiment of the present invention, the instrument display module receives a signal from the LIN bus module and displays the working status of the brake light on the instrument panel: when there is a problem with the brake light, the signal light displayed on the instrument is on; otherwise, the signal light is off, indicating that the brake light is working normally. Specifically, the LIN bus module is responsible for collecting the working status information of the brake light and sending it to the instrument display module. The LIN bus module encodes the working status information of the brake light into a digital signal for transmission on the bus. The instrument display module contains a signal processing circuit and a display logic circuit. The signal processing circuit is responsible for receiving and processing the digital signal from the LIN bus module and converting it into a signal format that can be recognized by the display module; the display logic circuit controls whether the signal light on the instrument panel is on according to the output result of the signal processing circuit. When there is a problem with the brake light, the display logic circuit makes the signal light on; otherwise, the signal light is off. The signal light on the instrument panel provides intuitive visual feedback for the driver, so that the driver can easily understand the working status of the brake light.

[0057] In an embodiment of the present invention, the brake light working state monitoring system also includes a voice reminder module, which is electrically connected to the LIN bus module and is used to send a sound alarm signal according to the signal sent by the LIN bus module. The voice reminder module includes a signal processing circuit, a voice synthesis circuit and a speaker. When the LIN bus module detects that the brake light is faulty, it will send a digital signal containing fault information to the voice reminder module; after receiving the signal, the voice reminder module first decodes and processes the signal through the signal processing circuit to extract the fault information; then, the voice synthesis circuit generates a corresponding voice alarm signal according to the extracted fault information; finally, the speaker converts the voice alarm signal into a sound output to remind the driver that the brake light is faulty. By introducing the voice reminder module, the brake light working state monitoring system can send a sound alarm signal in time when the brake light fails, reminding the driver to pay attention and take corresponding measures, thereby effectively avoiding safety hazards during driving.

[0058] The present invention also provides an embodiment of a brake light working state monitoring method, comprising the following steps:

[0059] Photoelectric conversion step: used to convert the light signal emitted by the brake light into an electrical signal; wherein, a photoelectric conversion device such as a photodiode, a photoresistor or a phototransistor is used for photoelectric conversion, and the photoelectric conversion device is placed at a position where it can receive the light emitted by the brake light, ensuring that the photoelectric conversion device can receive sufficient light signals when the brake light is on.

[0060] Signal acquisition and processing step: used to receive the electrical signal output by the photoelectric conversion module, and amplify and adjust the electrical signal;

[0061] LIN bus communication steps: used to receive the signal output by the signal acquisition and processing module, further process the signal, and then send it to the vehicle bus;

[0062] Instrument display step: used to receive the signal from the LIN bus module and convert the signal into prompt information to display the working status of the brake light on the instrument panel. According to the decoded brake light working status information, the instrument display module converts it into corresponding prompt information, such as "brake light normal", "brake light fault", etc.

[0063] The brake light working state monitoring method of this embodiment can realize real-time monitoring and display of the brake light working state, which not only improves driving safety, but also enhances the driver's perception of the vehicle state. At the same time, due to the use of the LIN bus communication protocol, the method also has good scalability and compatibility, and can be easily integrated into the existing automotive electronic system.

[0064] It should be noted that the structure, execution process and other contents of the above-mentioned method are based on the same concept as the system embodiment of the present application, and are methods corresponding to the above-mentioned brake light working status monitoring system. All implementation structures in the above-mentioned system embodiment are applicable to the embodiment of the method. Its specific functions and technical effects can be found in the system embodiment part, which will not be repeated here.

[0065] The present invention also provides an embodiment of a vehicle, including the above-mentioned brake light working state monitoring system. The brake light working state monitoring system can monitor the working state of the brake light in real time. Once a brake light failure is found, an alarm is immediately issued to remind the driver to repair or replace the brake light in time, thereby improving driving safety and reducing traffic accidents caused by brake light failure. Through integration and linkage with other vehicle systems, more intelligent fault diagnosis and early warning can be achieved, providing the driver with more comprehensive and accurate vehicle status information.

[0066] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the present invention is not limited to the scope of implementation shown in the drawings, and all changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification and drawings, should be within the protection scope of the present invention.

Claims

1. A brake light working status monitoring system, characterized in that: include: A photoelectric conversion module, used to convert the light signal emitted by the brake light into an electrical signal; A signal acquisition and processing module, configured to receive the electrical signal output by the photoelectric conversion module, and amplify and adjust the electrical signal; LIN bus module, used to receive the signal output by the signal acquisition and processing module, further process the signal, and then send it to the vehicle bus; The instrument display module is used to receive signals from the LIN bus module and convert the signals into prompt information to display the working status of the brake light on the instrument panel.

2. The brake light operating status monitoring system according to claim 1, characterized in that: The photoelectric conversion module includes a photoelectric coupler, which is used to convert optical signals into electrical signals and output them to subsequent circuits.

3. The brake light operating status monitoring system according to claim 2, characterized in that: The photoelectric coupler includes a brake light and a phototransistor used in conjunction with the brake light. The brake light emits light when it is on, and the phototransistor receives the light and generates a corresponding electrical signal.

4. The brake light operating status monitoring system according to claim 3, characterized in that: The photoelectric conversion module further includes a filter, which is used to filter out light irrelevant to the working state of the brake light.

5. The brake light operating status monitoring system according to claim 3, characterized in that: The signal acquisition and processing module includes: a signal amplifying circuit, comprising an NPN transistor Q2, for amplifying the electrical signal from the photocoupler; The signal control circuit includes a PNP transistor Q1 as a switching element for controlling the on and off of the output signal; The regulation circuit includes a first resistor R1 and a second resistor R2. The first resistor R1 is used to adjust the amplification factor of the signal amplification circuit. The second resistor R2 works together with the first resistor R1 to control the switching state of the PNP transistor Q1 according to the change of the input signal, thereby adjusting the output signal.

6. The brake light operating status monitoring system according to claim 5, characterized in that: The base of the PNP transistor Q1 receives the amplified electrical signal through the second resistor R2 , and the collector of the PNP transistor Q1 outputs a control signal.

7. The brake light operating status monitoring system according to claim 1, characterized in that: The instrument display module receives the signal from the LIN bus module and displays the working status of the brake light on the instrument panel: when there is a problem with the brake light, the signal light on the instrument is on; otherwise, the signal light is off, which means the brake light is working normally.

8. The brake light operating status monitoring system according to claim 1, characterized in that: It also includes a voice reminder module, which is electrically connected to the LIN bus module and is used to send a sound alarm signal according to the signal sent by the LIN bus module.

9. A method for monitoring the working status of a brake light, characterized in that: The following steps are involved: Photoelectric conversion step: used to convert the light signal emitted by the brake light into an electrical signal; Signal acquisition and processing step: for receiving the electrical signal output by the photoelectric conversion module, and amplifying and regulating the electrical signal; LIN bus communication step: for receiving the signal output by the signal acquisition and processing module, further processing the signal, and then sending it to the vehicle bus; Instrument display step: used to receive signals from the LIN bus module and convert the signals into prompt information to display the working status of the brake light on the instrument panel.

10. A vehicle, characterized in that: A brake light operating status monitoring system comprising the brake light operating status monitoring system according to any one of claims 1 to 8.

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