A new MDI device

Abstract

The utility model provides a novel MDI equipment, including male head, CAN circuit, MCU circuit, 4G module, USB switching circuit and power conversion circuit, male head is used for inputting normal power supply, ACC power supply and fault diagnosis signal, CAN circuit is connected with the output of male head, the input of MCU circuit is used for being connected with the output of CAN circuit, 4G module is used for wireless transmission of data, 4G module is used for being connected with the output of MCU circuit, USB switching circuit is used for controlling the output of MCU circuit and USB line or 4G module is connected, power conversion circuit is used for being connected with the output of male head, power conversion circuit is used for CAN circuit, MCU circuit, USB switching circuit and 4G module power supply. The product corresponding to the utility model can not only be compatible with the multichannel diagnostic instrument defined by J2534 but also realize the function of connecting host computer through usb wired, bluetooth, wifi or 4G.

Description

Technical Field

[0001] This utility model relates to the field of automotive diagnostic technology, specifically a novel MDI device. Background Technology

[0002] MDI, or Multifunctional Diagnostic Interface, is a key component in automotive electronics, responsible for the core function of data interaction between the vehicle and the host computer. It is used by the host computer to diagnose vehicle faults and plays a crucial role in automotive R&D testing, fault diagnosis, and intelligent connected vehicle applications.

[0003] However, current MDI devices on the market still have limitations in terms of hardware architecture and software protocols. MDI devices cannot simultaneously support multiple communication methods such as USB wired connection, Bluetooth wireless transmission, WiFi network communication, and 4G mobile network to establish a stable connection with the host computer. This current single connection mode makes MDI devices lack flexibility and compatibility in different application scenarios. For example, in scenarios requiring remote diagnostics or mobile operations, MDI devices lacking wireless communication capabilities are inadequate, thus hindering their widespread adoption to some extent. Utility Model Content

[0004] The purpose of this invention is to improve and innovate upon the shortcomings and problems existing in the background technology, and to provide a new type of MDI device.

[0005] A new type of MDI device includes: Male connector, used for inputting constant power supply, ACC power supply and fault diagnosis signals; A CAN circuit, wherein the CAN circuit is connected to the output terminal of the male connector; An MCU circuit, wherein the input terminal of the MCU circuit is used to connect to the output terminal of the CAN circuit; The 4G module is used for wireless data transmission and is connected to the output terminal of the MCU circuit. USB switching circuit, which is used to control the output terminal of the MCU circuit to connect to a USB cable or a 4G module; A power conversion circuit is provided for connection to the output terminal of the male connector; the power conversion circuit is used to supply power to the CAN circuit, MCU circuit, USB switching circuit and 4G module.

[0006] A further embodiment includes a DOIP circuit, wherein the input of the DOIP circuit is used to connect to the output of the male connector, the output of the DOIP circuit is used to connect to the 4G module, and the USB switching circuit is used to control the output of the MCU circuit to connect to the USB cable or the 4G module and to control the input of the 4G module to connect to the MCU circuit or the DOIP circuit.

[0007] A further option is to include a candlestick circuit, wherein the input terminal of the candlestick circuit is connected to a male connector, and the output terminal of the candlestick circuit is connected to an MCU circuit.

[0008] A further solution is that the USB switching circuit uses an FSUSB30MUX chip. The D+ and D- pins of the FSUSB30MUX chip are connected to the 4G module, and the HSD1+ and HSD1- pins of the FSUSB30MUX chip are connected to the MCU circuit and / or the TYPE-C port. The HSD2+ and HSD2- pins are connected to the DOIP chip, and the OE pin is connected to the debug USB chip. When the HSD1+ and HSD1- pins of the FSUSB30MUX chip are connected to the TYPE-C port of the USB cable, the debug USB chip automatically senses this, so that the output of the MCU circuit can communicate with the USB cable.

[0009] A further embodiment is that the power conversion circuit includes multiple voltage regulator chips; among them, the voltage regulator chip LSP5523 is used to reduce the 12V voltage to 5V to power the CAN circuit; the voltage regulator chip ME6119C33M5GA is used to reduce the 5V voltage to 3.3V to power the MCU circuit and USB switching circuit; and the voltage regulator chip JW5361 is used to reduce the 5V voltage to 3.8V to power the 4G module.

[0010] A further solution includes a serial port level conversion circuit, the input of which is connected to the MCU circuit, and the output of which is connected to the 4G module. The serial port level conversion circuit is used to realize level conversion.

[0011] A further option is to use the L9637D chip in the K-line circuit.

[0012] A further option is that the DOIP circuit uses the SR9900A chip.

[0013] A further option is that the 4G module adopts the SC200L-INTERNAL module.

[0014] Compared with existing technologies, the advantages of this invention are as follows: This invention can perform fault diagnosis via K-line or CAN bus, and also via Ethernet, thus achieving compatibility with different types of vehicles. Furthermore, when the USB switching circuit detects a USB cable connection, it automatically switches to high-speed communication with the host computer via USB; if no USB cable is connected, the USB switching circuit will establish a connection with the host computer via the 4G module. In other words, this MDI device supports both wired USB connection and stable wireless connection with the host computer. Therefore, the product corresponding to this invention is not only compatible with the multi-channel diagnostic instrument defined in J2534, but also enables connection to the host computer via USB wired, Bluetooth, Wi-Fi, or 4G. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the structure of a novel MDI device provided in an embodiment of this utility model; Figure 2 Circuit diagram of the male connector provided in this embodiment of the utility model; Figure 3 A circuit diagram of the CAN circuit provided in an embodiment of this utility model; Figure 4 A circuit diagram of the K-line circuit provided in an embodiment of this utility model; Figure 5 A circuit diagram of the MCU circuit provided in an embodiment of this utility model; Figure 6 A circuit diagram of the USB switching circuit provided in an embodiment of this utility model; Figure 7 A circuit diagram of the serial port level conversion circuit provided in an embodiment of this utility model; Figure 8 A circuit diagram of the DOIP circuit provided in an embodiment of this utility model; Figure 9 The circuit diagram is provided for the power conversion circuit in the embodiment of this utility model. Detailed Implementation

[0017] To make the objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] Please see Figure 1 This utility model provides a novel MDI device, including a male connector, a power conversion circuit, a K-line circuit, a CAN circuit, an MCU circuit, a serial port level conversion circuit, a USB switching circuit, a DOIP circuit, a 4G module, and a power conversion circuit; the power conversion circuit is used to connect to the output terminal of the male connector; the power conversion circuit is used to supply power to the K-line circuit, CAN circuit, MCU circuit, serial port level conversion circuit, USB switching circuit, DOIP circuit, and 4G module.

[0020] Please see Figure 2 The male connector is an OBDⅡ-Female connector, used to input constant power, ACC power, and fault diagnostic signals. Constant power refers to the power source directly drawn from the positive terminal of the car battery, providing continuous power. ACC power is the power supply controlled by the car key. The output terminals of the male connector connect to the K-line circuit, CAN circuit, DOIP circuit, and power conversion circuit.

[0021] The input terminals of the MCU circuit can be connected to either a K-line circuit or a CAN circuit. It should be noted that the K-line circuit and the CAN circuit support different physical protocols. In practical applications, different vehicles require different circuits for fault diagnosis. Some vehicles need to use the K-line circuit for fault diagnosis, while others rely on the CAN circuit. This ensures that the MCU circuit is compatible with different types of vehicles.

[0022] Please see Figure 3 and Figure 5 The CAN circuit uses the TJA1051T / 3 chip, and the MCU circuit uses the STM32G474CET6 chip. Pins 1 and 4 of the TJA1051T / 3 chip are connected to pins PB12 and PB13 of the STM32G474CET6 chip for transmitting the acquired diagnostic data. Pins 6 and 7 of the TJA1051T / 3 chip are connected to pins 6 and 14 of the standard OBDII male connector.

[0023] Please see Figure 4The K-line circuit uses the LSP5523 chip. Pins 1 and 4 of the LSP5523 chip are connected to the PA9 and PA10 pins of the MCU, and pin 6 of the LSP5523 chip is connected to pin 7 of the standard OBDII male connector.

[0024] It should be noted that the STM32G474CET6 chip is configured with an 8MHz quartz crystal oscillator to provide the clock. The PA0, PA1, PA2, and PA3 pins of the STM32G474CET6 chip are connected to the 4G module for data communication through a serial port level conversion circuit; the PB12 and PB13 pins are connected to the pins of the TJA1051 chip corresponding to the CAN circuit; the PA11 and PA12 pins are connected to the USB conversion circuit; and the PA9 and PA10 pins are connected to the L9637D chip of the K-line circuit.

[0025] The USB switching circuit controls the connection between the output of the MCU circuit and either a USB cable or a 4G module. When the USB switching circuit is connected to a USB cable, it connects the output of the MCU circuit to the USB cable, enabling the MDI device to communicate at high speed with the host computer via USB. When the USB switching circuit is not connected to a USB cable, it connects the output of the MCU circuit to the 4G module. Therefore, the MDI device supports both wired USB connection and establishing a stable wireless connection with the host computer.

[0026] Please see Figure 6 The USB switching circuit uses the FSUSB30MUX chip. The D+ and D- pins of the FSUSB30MUX chip are connected to the 4G module, and the HSD1+ and HSD1- pins are connected to the MCU circuit and the TYPE-C port. The OE pin is connected to the debug USB chip. When the HSD1+ and HSD1- pins of the FSUSB30MUX chip are connected to the TYPE-C port of the USB cable, the debug USB chip can automatically sense this and select the output of the MCU circuit to communicate with the USB cable.

[0027] It should be noted that, due to the voltage level difference between the MCU circuit and the 4G module, when the output of the MCU circuit is connected to the 4G module, a serial port level conversion circuit is required to convert the voltage levels between the two. In this embodiment, for example... Figure 7 As shown, the serial port level conversion circuit uses a USART level conversion chip. Pins A1, A2, A3 and A4 of the USART level conversion chip are connected to the 4G module, and pins B1, B2, B3 and B4 of the USART level conversion chip are connected to pins 34, 35, 36 and 37 of the STM32G474CET6 chip.

[0028] It should be further noted that the 4G module uses the SC200L-INTERNAL module; the SC200L-INTERNAL module has WIFI and Bluetooth functions, enabling the 4G module to communicate with the host computer not only via a wireless network but also via WIFI and Bluetooth. The 4G module establishes a communication connection with the server to receive and send information. The MCU circuit parses and packages the diagnosed fault information according to the protocol and sends it to the server (host computer) through the 4G module. Simultaneously, control commands from the server (host computer) are transmitted to the MCU circuit through the 4G module.

[0029] In some preferred embodiments, please refer to Figure 8 The male connector's output terminal is also connected to a DOIP circuit. The output terminal of the DOIP circuit is connected to the 4G module via a USB switching circuit. When the USB switching circuit selects the microcontroller's output terminal to connect to the 4G module, the microcontroller occupies the 4G module, and the 4G module performs diagnostics via the CAN bus or K-line. When the USB switching circuit selects the DOIP circuit's output terminal to connect to the 4G module, the 4G module performs diagnostics via Ethernet. In this embodiment, the DOIP circuit uses the SR9900A chip. The U2DP and U2DM pins of the SR9900A are connected to the HSD2+ and HSD2- pins of the FSUSB30MUX chip corresponding to the USB switching circuit. The S-pin of the FSUSB30MUX chip is connected to the PB9 pin of the STM32G474CET6 chip corresponding to the MCU circuit to control the switching enable.

[0030] Please see Figure 9 The power conversion circuit includes multiple voltage regulator chips; among them, the voltage regulator chip LSP5523 is used to reduce the 12V voltage to 5V to power the CAN circuit and K-line circuit; the voltage regulator chip ME6119C33M5GA is used to reduce the 5V voltage to 3.3V to power the MCU circuit, USB switching circuit and DOIP circuit; and the voltage regulator chip JW5361 is used to reduce the 5V voltage to 3.8V to power the 4G module.

[0031] In summary, this invention can perform fault diagnosis via K-line or CAN bus, or via Ethernet, thus achieving compatibility with different types of vehicles. Furthermore, when the USB switching circuit detects a USB cable connection, it automatically switches to high-speed communication with the host computer via USB; if no USB cable is connected, the USB switching circuit will establish a connection with the host computer via the 4G module. That is, this MDI device supports both wired USB connection and stable wireless connection with the host computer. Therefore, the product corresponding to this invention is not only compatible with the multi-channel diagnostic instrument defined in J2534, but also enables connection to the host computer via USB wired, Bluetooth, Wi-Fi, or 4G.

[0032] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Parts not described in detail in this specification are prior art known to those skilled in the art.

Claims

1. A novel MDI device, characterized in that, include: Male connector, used for inputting constant power supply, ACC power supply and fault diagnosis signals; A CAN circuit, wherein the CAN circuit is connected to the output terminal of the male connector; An MCU circuit, wherein the input terminal of the MCU circuit is used to connect to the output terminal of the CAN circuit; The 4G module is used for wireless data transmission and is connected to the output terminal of the MCU circuit. USB switching circuit, which is used to control the output terminal of the MCU circuit to connect to a USB cable or a 4G module; A power conversion circuit is provided for connection to the output terminal of the male connector; the power conversion circuit is used to supply power to the CAN circuit, MCU circuit, USB switching circuit and 4G module.

2. The novel MDI device according to claim 1, characterized in that: It also includes a DOIP circuit, the input of which is used to connect to the output of the male connector, and the output of which is used to connect to the 4G module. The USB switching circuit is used to control the output of the MCU circuit to connect to the USB cable or the 4G module, and to control the input of the 4G module to connect to the MCU circuit or the DOIP circuit.

3. A novel MDI device according to claim 1, characterized in that: It also includes a K-line circuit, the input of which is connected to a male connector, and the output of which is connected to an MCU circuit.

4. A novel MDI device according to claim 2, characterized in that: The USB switching circuit uses the FSUSB30MUX chip. The D+ and D- pins of the FSUSB30MUX chip are connected to the 4G module, and the HSD1+ and HSD1- pins of the FSUSB30MUX chip are connected to the MCU circuit and / or the TYPE-C port. The HSD2+ and HSD2- pins are connected to the DOIP chip, and the OE pin is connected to the debug USB chip. When the HSD1+ and HSD1- pins of the FSUSB30MUX chip are connected to the TYPE-C port of the USB cable, the debug USB chip automatically senses this, so that the output of the MCU circuit can communicate with the USB cable.

5. A novel MDI device according to claim 1, characterized in that: The power conversion circuit includes multiple voltage regulator chips; among them, the voltage regulator chip LSP5523 is used to reduce the 12V voltage to 5V to power the CAN circuit; the voltage regulator chip ME6119C33M5GA is used to reduce the 5V voltage to 3.3V to power the MCU circuit and USB switching circuit; and the voltage regulator chip JW5361 is used to reduce the 5V voltage to 3.8V to power the 4G module.

6. A novel MDI device according to claim 1, characterized in that: It also includes a serial port level conversion circuit, the input of which is connected to the MCU circuit, and the output of which is connected to the 4G module. The serial port level conversion circuit is used to realize level conversion.

7. A novel MDI device according to claim 3, characterized in that: The K-line circuit uses the L9637D chip.

8. A novel MDI device according to claim 2, characterized in that: The DOIP circuit uses the SR9900A chip.

9. A novel MDI device according to claim 1, characterized in that: The 4G module uses the SC200L-INTERNAL module.

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