Vehicle-mounted automatic diagnosis device and vehicle

Abstract

The utility model relates to the field of vehicle-mounted technology, and discloses a vehicle-mounted automatic diagnosis device and a vehicle, the vehicle-mounted automatic diagnosis device comprises a plurality of communication ports and a communication protection circuit; the communication protection circuit comprises a plurality of port protection modules, the first end of each port protection module is connected with a communication port, and the second end of each port protection module is grounded; and each port protection module is used for performing signal protection on each communication port during communication. According to the vehicle-mounted automatic diagnosis device, the influence of electrical interference and static electricity can be effectively reduced through the communication protection circuit, hardware and communication signals are protected, and normal work is ensured.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more particularly to an on-board automatic diagnostic device and a vehicle. Background Technology

[0002] On-board diagnostics (OBD) systems are standardized systems used to monitor vehicle performance and emission control systems, helping technicians quickly diagnose and repair vehicle problems. The electrical environment of vehicles often contains electrostatic discharge (ESD) and electrical interference. Electrical interference can affect communication within the OOD system, leading to data transmission errors or loss, and communication failures. If the OOD system lacks proper electrostatic discharge (ESD) protection, it may damage its hardware, affecting its normal operation. Therefore, many OOD systems lack anti-static and surge protection devices. Utility Model Content

[0003] In view of this, embodiments of this application provide an on-board automatic diagnostic device and a vehicle, which can effectively solve the problem that on-board automatic diagnostic devices are easily affected by static electricity and electrical interference.

[0004] In a first aspect, embodiments of this application provide an on-board automatic diagnostic device, including multiple communication ports and a communication protection circuit;

[0005] The communication protection circuit includes multiple port protection modules, each of which has a first terminal connected to a communication port and a second terminal grounded.

[0006] Each of the port protection modules is used to protect the signal of each of the communication ports during communication.

[0007] In a first possible embodiment of the first aspect, each of the port protection modules includes a protection unit and an anti-interference unit; the protection unit and the anti-interference unit are connected in parallel, a first parallel node of the protection unit and the anti-interference unit is connected to the communication port, and a second parallel node of the protection unit and the anti-interference unit is grounded;

[0008] The protection unit is used to be in a cut-off state when the communication signal of the communication port is in a normal state, and in a conduction state when the communication signal is in an abnormal state.

[0009] The anti-interference unit is used to filter the communication signals passing through the communication port.

[0010] In a second possible embodiment of the first aspect, the protection unit includes a diode;

[0011] The first end of the diode is connected to the first end of the anti-interference unit, and the second end of the diode is connected to the second end of the anti-interference unit.

[0012] In a third possible embodiment of the first aspect, the anti-interference unit includes a capacitor;

[0013] The first end of the capacitor is connected to the first end of the protection unit, and the second end of the capacitor is connected to the second end of the protection unit.

[0014] In a fourth possible embodiment of the first aspect, the diode is a bidirectional TVS diode.

[0015] In a fifth possible embodiment of the first aspect, the on-board automatic diagnostic device further includes: a diagnostic connection module;

[0016] The diagnostic connection module includes multiple communication ports for connecting the diagnostic module and various electronic control modules of the vehicle, respectively, and providing communication lines for the diagnostic module and each of the electronic control modules.

[0017] In a sixth possible embodiment of the first aspect, the on-board automatic diagnostic device further includes: a diagnostic module;

[0018] The diagnostic module is used to receive fault codes and real-time data from each of the vehicle's electronic control modules, and to diagnose each of the electronic control modules based on the fault codes and the real-time data.

[0019] In a seventh possible embodiment of the first aspect, the plurality of communication ports include a first differential signal receiving port, a second differential signal receiving port, a first differential signal transmitting port, and a second differential signal transmitting port;

[0020] The diagnostic connection module is also used to transmit the fault code and the real-time data through differential communication signals based on the differential signal receiving port and the differential signal transmitting port.

[0021] Secondly, embodiments of this application provide a vehicle including the aforementioned on-board automatic diagnostic device.

[0022] In a first possible embodiment of the second aspect, the vehicle further includes: a plurality of electronic control modules;

[0023] Each of the aforementioned electronic control modules is used to control and manage various systems of the vehicle, record fault codes and real-time data, and communicate with the diagnostic module through the diagnostic connection module.

[0024] The embodiments of this application have the following beneficial effects:

[0025] This embodiment of an on-board automatic diagnostic device includes multiple communication ports and a communication protection circuit. The communication protection circuit includes multiple port protection modules, each with its first end connected to a communication port and its second end grounded. Each port protection module is used to protect the signal of each communication port during communication. By connecting the communication protection circuit to the communication ports of this on-board automatic diagnostic device, the influence of electrical and electrostatic discharge can be effectively reduced, protecting the communication hardware of the on-board automatic diagnostic device from damage by electrostatic discharge, protecting the integrity of the communication signal, ensuring the normal operation of the on-board automatic diagnostic device, and extending the service life of the hardware. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This paper shows a schematic diagram of a first structural embodiment of the vehicle-mounted automatic diagnostic device according to this application.

[0028] Figure 2 A schematic diagram of a communication protection circuit according to an embodiment of this application is shown;

[0029] Figure 3 A circuit diagram of a communication protection circuit according to an embodiment of this application is shown;

[0030] Figure 4 This application shows a schematic diagram of a waveform of a standard communication signal according to an embodiment of the present application;

[0031] Figure 5 This paper shows a waveform diagram of a communication signal actually measured according to an embodiment of this application;

[0032] Figure 6 A second structural schematic diagram of the vehicle-mounted automatic diagnostic device according to an embodiment of this application is shown;

[0033] Figure 7 A schematic diagram of the structure of a vehicle according to an embodiment of this application is shown.

[0034] Explanation of key component symbols:

[0035] 100-On-board automatic diagnostic device; 10-Communication protection circuit; 110-Port protection module; 111-Protection unit; 112-Anti-interference unit; 20-Diagnostic module; 30-Diagnostic connection module; 200-Vehicle; 210-Electronic control module. Detailed Implementation

[0036] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0037] The components of the embodiments of this application described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0038] In the following text, the terms "comprising," "having," and their cognates, which may be used in various embodiments of this application, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more combinations thereof. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0039] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be construed as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0040] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0041] To suppress interference signals and prevent interference and hardware damage to the communication signals of the on-board automatic diagnostic device, this application provides an on-board automatic diagnostic device. The communication port of the on-board automatic diagnostic device is connected to a communication protection circuit. When the on-board automatic diagnostic device is affected by static electricity and electrical interference in the electrical environment, the communication protection circuit can withstand a larger voltage / current, preventing the on-board automatic diagnostic device from directly being subjected to the impact of a large voltage / current. At the same time, the communication protection circuit can also improve the quality of the communication signal and ensure the accurate transmission of data in the on-board automatic diagnostic device.

[0042] The following describes the on-board automatic diagnostic device with reference to some specific embodiments.

[0043] Figure 1 A schematic diagram of an on-board automatic diagnostic device 100 according to an embodiment of this application is shown. This on-board automatic diagnostic device 100 is used to monitor the operating status of a vehicle 200 and diagnose faults. It collects and analyzes key data from the vehicle 200 in real time to detect and record fault information of the vehicle 200. Exemplarily, the on-board automatic diagnostic device 100 includes multiple communication ports and a communication protection circuit 10. The communication protection circuit 10 includes multiple port protection modules 110. The first end of each port protection module 110 is connected to a communication port to protect each communication port of the on-board automatic diagnostic device 100. The second end of each port protection module 110 is grounded to protect the communication port from electrostatic discharge and electrical damage.

[0044] In this embodiment, each port protection module 110 is used to protect each communication port from electrostatic discharge (ESD) and electrical interference. Exemplary examples include... Figure 2 As shown, each port protection module 110 includes a protection unit 111 and an anti-interference unit 112; the protection unit 111 and the anti-interference unit 112 are connected in parallel, the first parallel node of the protection unit 111 and the anti-interference unit 112 is connected to a communication port, and the second parallel node of the protection unit 111 and the anti-interference unit 112 is grounded.

[0045] In one embodiment, when the on-board automatic diagnostic device 100 is not subjected to electrostatic discharge or electrical interference, and the communication signals of each communication port are normal, the protection unit 111 is in a cut-off state, like an open circuit. When the on-board automatic diagnostic device 100 is subjected to electrostatic discharge or electrical interference, and the communication signals of the communication ports are abnormal, voltage spikes and current surges will occur. The protection unit 111 can be in a conducting state to clamp the voltage spikes within a relatively safe range and to allow large currents to pass through, preventing the on-board automatic diagnostic device 100 from directly experiencing the impact of large currents. For example, external electrostatic discharge and electrical interference may superimpose abnormal voltage pulses on the signal lines. The protection unit 111 can clamp these abnormal pulses to ensure that the signal voltage is within the normal range, thereby protecting the signal lines inside the on-board automatic diagnostic device 100.

[0046] In one embodiment, the anti-interference unit 112 is used for energy storage and discharge. When a momentary high voltage is caused by electrostatic discharge or electrical interference at the communication interface, the anti-interference unit 112 absorbs the excess charge, thereby suppressing the rapid rise of voltage to a certain extent. Electrostatic discharge and electrical interference can cause surge current, which refers to a peak current or overload current that is much larger than the steady-state current when an abnormality occurs in the communication line. For surge current, the anti-interference unit 112 can provide a certain current instantaneously to supplement the current demand in the communication line and avoid malfunction of the on-board automatic diagnostic device 100 due to insufficient current supply. The anti-interference unit 112 is also used to filter communication signals. For high-frequency noise signals generated by electrostatic discharge or electrical interference, the anti-interference unit 112 can bypass them to ground.

[0047] In one implementation, such as Figure 3 As shown, the protection unit 111 includes a diode DT1; the first terminal of diode DT1 is connected to the first terminal of the anti-interference unit 112, and the second terminal of diode DT1 is connected to the second terminal of the anti-interference unit 112. As an optional solution, diode DT1 is a bidirectional TVS diode. A bidirectional TVS diode has bidirectional conduction characteristics and a relatively fixed conduction voltage. Once the voltage across the bidirectional TVS diode exceeds the conduction voltage, the conduction voltage will bypass the excess voltage, thereby limiting the voltage applied to the communication line of the on-board automatic diagnostic device 100 and preventing excessive voltage from damaging the sensitive components inside the on-board automatic diagnostic device 100.

[0048] It is understandable that when the communication signal in the on-board automatic diagnostic device 100 is an AC signal, a bidirectional TVS diode is selected for diode DT1. If a unidirectional TVS diode is selected, the negative signal of the communication signal will be limited, resulting in an incomplete communication signal and a communication error. Figure 4 and Figure 5 The waveform diagrams of the standard communication signal and the actual measured communication signal are shown. The vehicle automatic diagnostic device 100 uses a bidirectional TVS diode, which enables the actual communication signal to be consistent with the standard communication signal, ensuring the correct communication of the vehicle automatic diagnostic device 100.

[0049] In another embodiment, such as Figure 3 As shown, the anti-interference unit 112 includes a capacitor C1; the first end of capacitor C1 is connected to the first end of protection unit 111, and the second end of capacitor C1 is connected to the second end of protection unit 111. On the communication line of the on-board automatic diagnostic device 100, capacitor C1 can smooth the voltage. When electrical interference causes instantaneous fluctuations in the communication line, capacitor C1 can provide or absorb charge to maintain voltage stability, ensuring a stable communication line voltage supply for the on-board automatic diagnostic device 100, which helps improve signal quality and accurate data transmission.

[0050] It is understood that the on-board automatic diagnostic device 100 of this application primarily protects against instantaneous high voltage spikes using a bidirectional TVS diode, while capacitor C1 focuses on filtering high-frequency interference and stabilizing voltage. The parallel connection of the bidirectional TVS diode and capacitor C1 provides more comprehensive protection for the on-board automatic diagnostic device 100 from electrostatic and electrical interference. On one hand, the bidirectional TVS diode conducts rapidly when encountering a high voltage exceeding its break-off voltage, protecting the on-board automatic diagnostic device 100 from being damaged by excessive voltage; on the other hand, capacitor C1 continuously filters high-frequency interference signals and stabilizes the voltage, thereby improving signal quality and ensuring accurate data transmission.

[0051] In one embodiment, such as Figure 6 As shown, the on-board automatic diagnostic device 100 also includes a diagnostic module 20 and a diagnostic connection module 30; the diagnostic connection module 30 includes multiple communication ports to connect to each electronic control module 210 and the diagnostic module 20 respectively, providing communication lines for the diagnostic module 20 and each electronic control module 210, so that the diagnostic module 20 can communicate with the electronic control module 210 of the vehicle 200, thereby realizing fault diagnosis, data monitoring and other functions.

[0052] In one embodiment, the multiple communication ports include a first differential signal receiving port, a second differential signal receiving port, a first differential signal transmitting port, and a second differential signal transmitting port. The diagnostic connection module 30 is also used to transmit fault codes and real-time data via differential communication signals based on the differential signal receiving port and the differential signal transmitting port. In the on-board automatic diagnostic device 100, each communication port is used for communication between each electronic control module 210 and the diagnostic module 20, transmitting data via differential signals to ensure the accuracy and reliability of the data in complex electromagnetic environments.

[0053] It is understandable that the use of differential signals can improve the anti-interference capability of the on-board automatic diagnostic device 100. Since there are a large number of electronic devices and electromagnetic interference sources inside the car, the use of differential signals can effectively reduce errors in the communication signal transmission process and improve the stability and reliability of the on-board automatic diagnostic device 100.

[0054] In another embodiment, the diagnostic connection module 30 includes multiple ports, wherein multiple specific ports can be configured as differential signal receiving ports and differential signal transmitting ports. Other ports of the diagnostic connection module 30 can also be connected to a power supply to provide the required operating voltage for the diagnostic module 20. Other ports of the diagnostic connection module 30 are also used to provide a ground connection, which ensures the stability of the electrical connection between the diagnostic module 20 and each electronic control module 210.

[0055] In one embodiment, each electronic control module 210 is used to control and manage various systems of the vehicle 200, record fault codes and real-time data, and communicate with the diagnostic module 20 through the diagnostic connection module 30. Each electronic control module 210 receives signals from sensors, processes the signals from the sensors, and outputs control commands according to preset programs and data to ensure the normal operation of the vehicle 200.

[0056] In one embodiment, a fault code is a standardized code used to indicate a problem in vehicle 200. When the electronic control module 210 detects a problem with a component in the system, it records the relevant fault information in the form of a fault code in its internal memory. For example, if a sensor in the engine malfunctions, the electronic control module 210 will record a specific fault code indicating the problem with that sensor. The electronic control module 210 can also record real-time data, including engine operating parameters, sensor readings, and the status of other critical systems, enabling it to monitor the performance of vehicle 200 and diagnose vehicle 200 faults based on the real-time data. For example, the electronic control module 210 can record parameters such as engine speed, temperature, and oil pressure, which can be read and analyzed by the diagnostic module 20.

[0057] In one embodiment, the diagnostic module 20 receives fault codes and real-time data from each electronic control module 210 and performs diagnostics on each electronic control module 210 based on the fault codes and real-time data. The diagnostic module 20 includes a fault code reader and diagnostic software. The reader can be connected to the vehicle 200 via a communication interface and displays fault codes to help maintenance personnel quickly locate problems. The diagnostic software provides more in-depth diagnostic functions, including real-time monitoring of the vehicle 200's operating status, analysis of sensor data, performance of proactive testing, and provision of maintenance suggestions.

[0058] It is understood that the diagnostic module 20 communicates with the various electronic control modules 210 of the vehicle 200 through the communication interface provided by the diagnostic connection module 30. Each electronic control module 210 is used to monitor and control various systems of the vehicle 200, such as the engine, transmission, and braking system. When one or more electronic control modules 210 detect a problem with a component in the system, it records a fault code and real-time data, and illuminates a malfunction indicator light on the instrument panel if necessary. The diagnostic module 20 can read these fault codes and real-time data and provide detailed diagnostic information to help repair personnel determine the root cause of the problem.

[0059] Based on the on-board automatic diagnostic device 100 of the above embodiments, this embodiment proposes a vehicle 200, which includes, but is not limited to, pure electric passenger vehicles, plug-in hybrid electric passenger vehicles, and fuel cell vehicles. Exemplarily, this vehicle 200 includes the on-board automatic diagnostic device 100 of the above embodiments, which collects and analyzes key vehicle data in real time to detect and record fault information of the vehicle 200. Since this vehicle uses the above-described on-board automatic diagnostic device 100, it possesses all the advantages of the above-described on-board automatic diagnostic device 100. It is understood that the options in the above embodiments are also applicable to this embodiment, and therefore will not be described again here.

[0060] Figure 7 A schematic diagram of a vehicle 200 according to an embodiment of this application is shown. In one embodiment, the vehicle 200 further includes a plurality of electronic control modules 210, exemplary of which the plurality of electronic control modules 210 include an engine control module, a transmission control module, a brake control module, a chassis control module, and an audio entertainment control module, etc.

[0061] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. An on-board automatic diagnostic device, characterized in that, Includes multiple communication ports and communication protection circuits; The communication protection circuit includes multiple port protection modules, each of which has a first terminal connected to a communication port and a second terminal grounded. Each of the port protection modules is used to protect the signal of each of the communication ports during communication.

2. The vehicle-mounted automatic diagnostic device according to claim 1, characterized in that, Each of the port protection modules includes a protection unit and an anti-interference unit; the protection unit and the anti-interference unit are connected in parallel, the first parallel node of the protection unit and the anti-interference unit is connected to the communication port, and the second parallel node of the protection unit and the anti-interference unit is grounded; The protection unit is used to be in a cut-off state when the communication signal of the communication port is in a normal state, and in a conduction state when the communication signal is in an abnormal state. The anti-interference unit is used to filter the communication signals passing through the communication port.

3. The on-board automatic diagnostic device according to claim 2, characterized in that, The protection unit includes a diode; The first end of the diode is connected to the first end of the anti-interference unit, and the second end of the diode is connected to the second end of the anti-interference unit.

4. The vehicle-mounted automatic diagnostic device according to claim 2, characterized in that, The anti-interference unit includes a capacitor; The first end of the capacitor is connected to the first end of the protection unit, and the second end of the capacitor is connected to the second end of the protection unit.

5. The on-board automatic diagnostic device according to claim 3, characterized in that, The diode is a bidirectional TVS diode.

6. The vehicle-mounted automatic diagnostic device according to claim 1, characterized in that, Also includes: Diagnostic connection module; The diagnostic connection module includes multiple communication ports for connecting the diagnostic module and various electronic control modules of the vehicle, respectively, and providing communication lines for the diagnostic module and each of the electronic control modules.

7. The on-board automatic diagnostic device according to claim 6, characterized in that, Also includes: Diagnostic module; The diagnostic module is used to receive fault codes and real-time data from each of the vehicle's electronic control modules, and to diagnose each of the electronic control modules based on the fault codes and the real-time data.

8. The on-board automatic diagnostic device according to claim 7, characterized in that, The plurality of communication ports include a first differential signal receiving port, a second differential signal receiving port, a first differential signal transmitting port, and a second differential signal transmitting port; The diagnostic connection module is also used to transmit the fault code and the real-time data through differential communication signals based on the differential signal receiving port and the differential signal transmitting port.

9. A vehicle, characterized in that, Includes the on-board automatic diagnostic device as described in any one of claims 1-8.

10. The vehicle according to claim 9, characterized in that, Also includes: Multiple electronic control modules; Each of the electronic control modules is used to control and manage the vehicle system, record fault codes and real-time data, and communicate with the diagnostic module through the diagnostic connection module.

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