Wireless diagnosis equipment based on CAN FD

Abstract

The utility model relates to a wireless diagnostic device based on CAN FD, which comprises an ECU module, a microcontroller, a CAN FD transceiver, a wireless module, a power supply module, a storage module, a reset unit, an OBD-II plug and a shell, the OBD-II plug is used for being connected with the ECU module, the other end of the OBD-II plug is electrically connected with the power supply module, the microcontroller is in communication connection with the CAN FD transceiver, the CAN FD transceiver is in communication connection with the shell, and the wireless module is in communication connection with the shell. The CAN FD transceiver is connected with the ECU module through an OBD-II plug; the microcontroller is in communication connection with the wireless module, and the microcontroller is in wireless communication connection with an upper computer through the wireless module; the microcontroller is provided with a reset unit. According to the utility model, the microcontroller, the CAN FD transceiver, the wireless module and the power supply module are arranged in the shell based on the OBD-II plug, so that dual-path CAN FD communication is realized, and communication with external equipment is realized through the wireless module.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle diagnosis technical field, concretely relates to a wireless diagnosis equipment based on CAN FD. BACKGROUND

[0002] The existing vehicle-mounted diagnosis equipment usually adopts the traditional CAN communication mode, and the data transmission rate is low, which cannot meet the complex diagnosis demand of modern automobile. In addition, most of the equipment realizes data transmission through Bluetooth or wired connection, and there are problems such as short communication distance, slow speed, inconvenient operation and the like. Although there are OBD-II equipment such as ELM327 on the market, its function is single, only supports part of the protocol, and cannot meet the comprehensive diagnosis demand.

[0003] With the introduction of CAN FD (Flexible Data-rate CAN), the transmission efficiency of vehicle diagnosis data is greatly improved. CAN FD is defined by ISO11898-1 / -2 standard. Its core goal is to solve the data transmission bottleneck problem of traditional CAN after the complexity of automobile electronics is improved, and it is especially suitable for new energy vehicles, automatic driving and other scenes with strong demand for high-speed and large-capacity data interaction.

[0004] Therefore, a portable wireless diagnosis equipment based on CAN FD is urgently needed. SUMMARY

[0005] The utility model discloses to solve the problem that the existing vehicle-mounted diagnosis equipment function is single and cannot use CAN FD, and proposes a wireless diagnosis equipment based on CAN FD, which is based on OBD-II plug, and sets up microcontroller, CAN FD transceiver, wireless module and power module in the shell, realizes double-way CAN FD communication, and communicates with external equipment through the wireless module.

[0006] To achieve the above-mentioned purpose, the utility model provides a wireless diagnosis equipment based on CAN FD, including ECU module, still including microcontroller, CAN FD transceiver, wireless module, power module, storage module, reset unit, OBD-II plug and shell, the OBD-II plug is used for connecting ECU module, and the other end of OBD-II plug is electrically connected with power module, and power module is used for power supply;

[0007] The microcontroller is communicated with CAN FD transceiver, and the CAN FD transceiver is connected with ECU module through OBD-II plug.

[0008] The microcontroller is communicated with wireless module, and the microcontroller is wirelessly communicated with host computer through wireless module.

[0009] The microcontroller is provided with a reset unit, and the microcontroller is in communication connection with the storage module.

[0010] Further, the microcontroller comprises an STM32G474 chip, the storage module comprises a W25Q64 module, and the STM32G474 chip is in communication connection with the W25Q64 module through an SPI serial port.

[0011] The reset unit comprises a reset button, one end of the reset button is grounded, and the other end of the reset button is connected to an NRST pin of the STM32G474 chip.

[0012] Further, the CAN FD transceiver comprises a TJA1052i module, and the TJA1052i module is connected to the STM32G474 chip through a UART serial port.

[0013] The TJA1052i module is electrically connected to the OBD-II plug.

[0014] The TJA1052i transceiver supports a 5Mbps rate, and a 120Ω terminal resistor is arranged in the connection circuit of the TJA1052i transceiver, so that signal reflection can be reduced, and data integrity in a complex electromagnetic environment can be ensured.

[0015] Further, the wireless module comprises an ESP32-S3 module, and the ESP32-S3 module is connected to the STM32G474 chip through a UART serial port.

[0016] The ESP32-S3 module is convenient to wire, has strong communication flexibility and compatibility compared with a single Bluetooth device, and can create a WiFi hotspot without external network.

[0017] Further, the power module comprises an LM2596 DC-DC converter and an AMS1117 voltage stabilizer, an input end of the LM2596 DC-DC converter is connected to the OBD-II plug, and an output end of the LM2596 DC-DC converter is connected to an input end of the AMS1117 voltage stabilizer.

[0018] The AMS1117 voltage stabilizer outputs a DC3.3V current, and the LM2596 DC-DC converter outputs a DC5V current.

[0019] The LM2596 DC-DC converter completes conversion from DC12V to DC5V, and the AMS1117 voltage stabilizer completes conversion from DC5V to DC3.3V, so as to meet the electricity consumption of various components.

[0020] Further, the OBD-II plug is provided with a TVS diode and a self-recovery fuse.

[0021] The shell is a square structure with an inner cavity, and a protective shell is arranged on one side of the shell, wherein the protective shell is a character-shaped structure, the protective shell and the shell are integrated, and an OBD-II plug is arranged in the protective shell.

[0022] The shell is provided with a key hole corresponding to the reset key.

[0023] The TVS diode can suppress voltage surges of the OBD-II plug, the protection circuit is protected from high voltage impact, the reset fuse provides short circuit protection, and the passageway is automatically restored after troubleshooting.

[0024] The shell protects the hardware circuit, and the protective shell protects the OBD-II plug, so that the OBD-II plug can be physically connected to the automobile jack.

[0025] Through the above technical scheme, the beneficial effects of the utility model are as follows:

[0026] 1. The utility model realizes the communication of CAN FD, and provides a hardware basis for realizing vehicle diagnosis based on CAN FD in combination with a wireless module. The OBD-II plug is convenient for power supply and data transmission from the vehicle jack, the OBD-II plug has high universality, the power module connected with the OBD-II plug converts the vehicle circuit, thereby realizing power supply for the hardware circuit, the CAN FD transceiver is arranged to complete the CAN FD communication of the microcontroller and the ECU module, the communication speed is greatly improved, the microcontroller is connected to the host computer through the wireless module, and wireless communication between the microcontroller and external equipment is realized. In addition, the microcontroller is provided with a storage module, so that program and detection data can be stored. The reset unit realizes physical reset of the microcontroller.

[0027] 2. The utility model is provided with a shell, and the shell protects the hardware circuit. In addition, due to the embedded structure, the electronic components are small in size, the size of the shell can be similar to that of the OBD-II plug, and therefore the device is good in portability. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 It is a circuit diagram of the wireless diagnosis device based on CAN FD;

[0029] Fig. 2 It is a structural diagram of the wireless diagnosis device based on CAN FD.

[0030] Corresponding to the reset key, the shell is provided with a key hole. DETAILED DESCRIPTION

[0031] Embodiment 1

[0032] As shown in Figs. 1-2 A wireless diagnostic device based on CAN FD, comprising an ECU module, further comprising a microcontroller 1, a CAN FD transceiver 2, a wireless module 3, a power module 4, a storage module 5, a reset unit 6, an OBD-II plug 7 for connecting the ECU module, and a shell 8, one end of the OBD-II plug 7 is electrically connected to the power module 4 for power supply;

[0033] The microcontroller 1 is in communication connection with the CAN FD transceiver 2, and the CAN FD transceiver 2 is connected to the ECU module through the OBD-II plug 7;

[0034] The microcontroller 1 is in communication connection with the wireless module 3, and the microcontroller 1 is wirelessly connected to an upper computer through the wireless module 3;

[0035] The microcontroller 1 is provided with the reset unit 6, and the microcontroller 1 is in communication connection with the storage module 5.

[0036] The microcontroller 1 comprises an STM32G474 chip, the storage module 5 comprises a W25Q64 module, and the STM32G474 chip is in communication connection with the W25Q64 module through an SPI serial port;

[0037] The reset unit 6 comprises a reset button, one end of the reset button is grounded, and the other end is connected to the NRST pin of the STM32G474 chip.

[0038] The CAN FD transceiver 2 comprises a TJA1052i module, and the TJA1052i module is connected to the STM32G474 chip through a UART serial port;

[0039] The TJA1052i module is electrically connected to the OBD-II plug 7.

[0040] The wireless module 3 comprises an ESP32-S3 module, and the ESP32-S3 module is connected to the STM32G474 chip through a UART serial port.

[0041] The power module 4 comprises an LM2596 DC-DC converter and an AMS1117 voltage stabilizer, the input end of the LM2596 DC-DC converter is connected to the OBD-II plug 7, and the output end of the LM2596 DC-DC converter is connected to the input end of the AMS1117 voltage stabilizer;

[0042] The AMS1117 voltage stabilizer outputs a DC3.3V current, and the LM2596 DC-DC converter outputs a DC5V current.

[0043] The OBD-II plug 7 is provided with a TVS diode and a self-resetting fuse.

[0044] The shell 8 is a square structure with an inner cavity, and one side of the shell 8 is provided with a protective shell 9 which is a character-shaped structure and is integrated with the shell 8. The OBD-II plug 7 is arranged in the protective shell 9.

[0045] The shell 8 is provided with a key hole corresponding to the reset button.

[0046] In this embodiment, the Pin16 of the OBD-II plug 7 is connected to the anode of the TVS diode (SMAJ15A), and the cathode of the TVS diode is connected to the input of the LM2596 DC-DC converter through the self-resetting fuse.

[0047] The Pin6 and Pin14 of the OBD-II plug 7 are respectively connected to the CAN_H and CAN_L pins of the TJA1052i, and are connected to the vehicle CAN bus. The Pin3 and Pin11 of the OBD-II plug 7 are connected to the vehicle (internal) CAN bus.

[0048] The output of the LM2596 DC-DC converter is connected to the AMS1117 voltage stabilizer.

[0049] The CAN1_TX pin of the STM32G474 chip is connected to the CAN_TX pin of the TJA1052i, and the CAN1_RX pin is connected to the CAN_RX pin of the TJA1052i.

[0050] The U3_TX pin of the STM32G474 chip is connected to the U_RX pin of the ESP32-S3 module, and the U3_RX pin is connected to the U_TX pin of the ESP32-S3 module.

[0051] A terminal resistor is arranged between the CAN_H and CAN_L pins of the TJA1052i.

[0052] Embodiment 2

[0053] A CAN FD-based wireless diagnostic device based on embodiment 1, the operation process is as follows:

[0054] When operating, the OBD-II plug 7 is inserted into the vehicle socket, and the device is powered on. In this embodiment, the upper computer is a mobile phone. By connecting the hotspot generated by the ESP32-S3 module through the mobile phone, the built-in Web Server interface is accessed to perform related vehicle diagnostic operations.

[0055] The above-described embodiments are only preferred embodiments of the present application, and are not intended to limit the scope of the present application, so that equivalent changes or modifications made in the structure, features and principles described in the patent range of the present application should be included in the patent range of the present application.

Claims

1. A wireless diagnostic device based on CAN FD, comprising an ECU module, characterized in that, The microcontroller (1), the CAN FD transceiver (2), the wireless module (3), the power module (4), the storage module (5), the reset unit (6), the OBD-II plug (7) for connecting the ECU module, and the shell (8) are further included. The microcontroller (1) is in communication connection with the CAN FD transceiver (2), and the CAN FD transceiver (2) is connected with the ECU module through the OBD-II plug (7). The microcontroller (1) is in communication connection with the wireless module (3), and the microcontroller (1) is wirelessly connected with the upper computer through the wireless module (3). The microcontroller (1) is provided with the reset unit (6), and the microcontroller (1) is in communication connection with the storage module (5).

2. The wireless diagnostic device based on CAN FD according to claim 1, characterized in that, The microcontroller (1) includes an STM32G474 chip, and the storage module (5) includes a W25Q64 module, and the STM32G474 chip is in communication connection with the W25Q64 module through an SPI serial port. The reset unit (6) includes a reset button, one end of which is grounded and the other end of which is connected with an NRST pin of the STM32G474 chip.

3. The wireless diagnostic device based on CAN FD according to claim 2, characterized in that, The CAN FD transceiver (2) includes a TJA1052i module, and the TJA1052i module is connected with the STM32G474 chip through a UART serial port. The TJA1052i module is electrically connected with the OBD-II plug (7).

4. The wireless diagnostic device based on CAN FD according to claim 2, characterized in that, The wireless module (3) includes an ESP32-S3 module, and the ESP32-S3 module is connected with the STM32G474 chip through a UART serial port.

5. The wireless diagnostic device based on CAN FD according to claim 1, characterized in that, The power module (4) includes an LM2596 DC-DC converter and an AMS1117 stabilizer, and the input end of the LM2596 DC-DC converter is connected with the OBD-II plug (7), and the output end of the LM2596 DC-DC converter is connected with the input end of the AMS1117 stabilizer. The AMS1117 stabilizer outputs a DC 3.3V current, and the LM2596 DC-DC converter outputs a DC 5V current.

6. The wireless diagnostic device based on CAN FD according to claim 2, characterized in that, The OBD-II plug (7) is provided with a TVS diode and a self-recovery fuse; The shell (8) is a square structure with an internal cavity, and the shell (8) is provided with a protective shell (9) on one side, the protective shell (9) is a back-shaped structure, the protective shell (9) and the shell (8) are an integrated structure, and the OBD-II plug (7) is arranged in the protective shell (9); The shell (8) is provided with a key hole corresponding to the reset button.

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