Communication transceiver based on CAN FD protocol

Abstract

The utility model provides a communication transmit-receive device based on a CAN FD protocol, a power supply module provides a power supply for a central processor and a CAN communication module, the central processor receives a vehicle signal from a vehicle signal level conversion circuit and a button signal from an external button input, and then transmits the transmitted CAN instruction content to the CAN communication module, and the CAN communication module transmits the received CAN instruction content to the CAN FD protocol. The CAN signals are sent to a CAN bus of a cab environment through the communication module, so that a CAN signal sending function is realized; similarly, signals on the CAN bus can also be input to the communication module and then transmitted to the central processing module through the SPI channel, and the receiving function of the CAN signals is achieved. The device is simple in structure and easy to operate, the function of controlling each component can be realized only by connecting the set device to the CAN bus of the environment, and the cost is low.

Description

TECHNICAL FIELD

[0001] The utility model belongs to vehicle control circuit technical field especially, it is involved in a kind of communication transceiver based on CAN FD protocol. BACKGROUND

[0002] Controller Area Network (CAN) is a kind of serial communication protocol bus for real-time application, it can use twisted pair to transmit signal, and it is one of the most widely used fieldbus in the world.CAN protocol is used for communication between various elements in the vehicle, to replace the expensive and bulky power distribution harness.

[0003] In the process of vehicle authentication, complete components of the driver compartment environment need to be prepared, such as DCM, METECU, ETC, etc. The communication of each component in the driver compartment is through CAN protocol communication. We usually use CAN open environment (CANoe) kit developed by Vector company in Germany to simulate the transmission of various signals on the vehicle CAN bus. However, there are two difficulties in using this scheme: first, CANoe kit operation requires professionals, and some certification tests do not allow the testing party to operate on site; second, the cost of a single CANoe kit is about 150,000 yuan, which is relatively high. INVENTION CONTENTS

[0004] The utility model provides a kind of communication transceiver based on CAN FD protocol, by directly accessing the CAN bus of vehicle, the transmission of various CAN signals needed in the driver compartment is realized, to solve the problem of not being able to operate CANoe kit, transmit CAN signal and control the components in the driver compartment required for authentication in the process of vehicle authentication at low cost. The technical scheme is as follows:

[0005] A kind of communication transceiver based on CAN FD protocol, characterized by comprising central processing unit and CAN communication module;The central processing unit includes chip IC1, and the CAN communication module includes chip IC2;Chip IC1 model is ESP32-WROOM-32Ede, and chip IC2 model is ACAN2518FDClick;

[0006] The 19th port of chip IC1 and the 12th port of chip IC2 are connected to the 5V power supply provided by power module respectively;The 9th port of chip IC2 is connected to the 3.3V power supply provided by power module;

[0007] The 3rd port of the chip IC1 is connected with the 4th port of the connector CN1; the 4th port of the chip IC1 is connected with the 5th port of the connector CN1; the 5th port of the chip IC1 is connected with the 6th port of the connector CN1; the 6th port of the chip IC1 is connected with the 7th port of the connector CN1; the 7th port of the chip IC1 is connected with the 8th port of the connector CN1; the 8th port of the chip IC1 is connected with the 9th port of the connector CN1; the 9th port of the chip IC1 is connected with the 10th port of the connector CN1;

[0008] The 37th port of the chip IC1 is connected with the 8th port of the chip IC2; the 31st port of the chip IC1 is connected with the 7th port of the chip IC2; the 30th port of the chip IC1 is connected with the 6th port of the chip IC2;

[0009] The 29th port of the chip IC1 is connected with the 5th port of the chip IC2; the 28th port of the chip IC1 is connected with the 17th port of the chip IC2;

[0010] The 1st port and the 2nd port of the chip IC2 are respectively connected with the 1st port and the 2nd port of the connector CN3.

[0011] Further, the 10th port and the 11th port of the chip IC2 are respectively connected with the digital ground DGND.

[0012] Further, the 19th port of the chip IC1 is connected in parallel with the capacitor C9 and the capacitor C10 between the digital ground DGND.

[0013] Further, the 14th port, the 38th port and the 32nd port of the chip IC1 are respectively connected with the digital ground DGND.

[0014] Further, the power module comprises a chip IC3 and a chip IC4, the chip IC3 of the power module is responsible for outputting 5V power, and the chip IC4 of the power module is responsible for outputting 3.3V power; the model of the chip IC3 is BP5293-50; and the model of the chip IC4 is BP5293-33.

[0015] Further, the 19th port of the chip IC1 and the 12th port of the chip IC2 are respectively connected with the 2nd port of the chip IC3; and the 9th port of the chip IC2 is connected with the 2nd port of the chip IC4.

[0016] Further, the 1st port of the chip IC3 and the 1st port of the chip IC4 are connected with the 1st port of the connector CN1 respectively, the 3rd port of the chip IC3 and the 3rd port of the chip IC4 are connected with the digital ground DGND respectively; the 2nd port of the chip IC3 is connected with the 19th port of the chip IC1 and the 12th port of the chip IC2 respectively, and the 2nd port of the chip IC4 is connected with the 9th port of the chip IC2 and the 3rd port of the connector CN1 respectively. The chip IC3 and the chip IC4 obtain the analog vehicle BU power supply from the outside through the 1st port of the connector CN1 as the input of power conversion, the 2nd port of the chip IC3 outputs the converted 5V, and the 2nd port of the chip IC4 outputs the converted 3.3V.

[0017] Further, the capacitor C11 is connected in series between the 1st port of the chip IC3 and the digital ground DGND; and the capacitor C12 is connected in series between the 2nd port of the chip IC3 and the digital ground DGND.

[0018] Further, the capacitor C13 is connected in series between the 1st port of the chip IC4 and the digital ground DGND; and the capacitor C14 is connected in series between the 2nd port of the chip IC4 and the digital ground DGND.

[0019] Further, the 2nd port of the connector CN1 is connected with the digital ground DGND.

[0020] The device is simple in structure and easy to operate, and can realize the function of controlling each component by connecting the device to the CAN bus of the environment; the cost is low, and the cost of a single set of the device is only 500 yuan compared with 150,000 yuan of a set of CANoe. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings that form a part of this application provide further understanding of the present application, and the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application, and other related drawings can be obtained by those skilled in the art without creative labor on the premise that there is no conflict.

[0022] Figure 1 The figure is a principle block diagram of the present application;

[0023] Figure 2 The figure is a circuit structure diagram of the embodiment of the present application. DETAILED DESCRIPTION

[0024] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0025] The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0026] AsFigure 1 As shown, the utility model of module includes power module, central processing unit and CAN communication module, power module is connected with central processing unit and CAN communication module respectively, provides power supply for them, central processing unit is connected with CAN communication module.

[0027] As shown, the central processing unit includes chip IC1, and the CAN communication module includes chip IC2. Figure 2

[0028] Considering the modularity, maintainability and compactness of the overall design, the chip IC1 of the utility model adopts a development board with model ESP32-WROOM-32Ede, and the chip IC2 adopts a chip with model ACAN2518FDClick.

[0029] The power module is responsible for providing 5V power supply and 3.3V power supply.

[0030] The 19th port of the chip IC1 and the 12th port of the chip IC2 are respectively connected to the 5V power supply provided by the power module; specifically, the 19th port of the chip IC1 and the 12th port of the chip IC2 are respectively electrically connected to the 2nd port of the chip IC3 for 5V voltage input.

[0031] The 9th port of the chip IC2 is connected to the 3.3V power supply provided by the power module; specifically, the 9th port of the chip IC2 is electrically connected to the 2nd port of the chip IC4 for 3.3V voltage input.

[0032] The 3rd port (IO36) of the chip IC1 is connected to the 4th port of the connector CN1 for obtaining the externally input vehicle ACC signal; the 4th port (IO39) of the chip IC1 is connected to the 5th port of the connector CN1 for obtaining the externally input vehicle IG signal; the 5th port (IO34) of the chip IC1 is connected to the 6th port of the connector CN1 for obtaining the externally input vehicle REV signal; the 6th port (IO35) of the chip IC1 is connected to the 7th port of the connector CN1 for obtaining the externally input vehicle PKB signal; the 7th port (IO32) of the chip IC1 is connected to the 8th port of the connector CN1 for obtaining the externally input analog vehicle steering wheel key; the 8th port (IO33) of the chip IC1 is connected to the 9th port of the connector CN1 for obtaining the externally input analog vehicle rear key; and the 9th port (IO25) of the chip IC1 is connected to the 10th port of the connector CN1 for obtaining the externally input analog vehicle remote key.

[0033] Preferably, the 14th port, the 38th port and the 32nd port of the chip IC1 are respectively connected to the digital ground DGND for grounding.

[0034] ​The central processor and the CAN transceiver module adopt SPI communication, that is, the chip IC1 of the central processor and the chip IC2 of the CAN transceiver module adopt SPI communication. Specifically, the 37th port (SDI) of the chip IC1 is connected with the 8th port (SDI) of the chip IC2, serving as the SDI of the SPI communication; the 31st port (SDO) of the chip IC1 is connected with the 7th port (SDO) of the chip IC2, serving as the SDO of the SPI communication; and the 30th port (SDK) of the chip IC1 is connected with the 6th port (SDK) of the chip IC2, serving as the SCK of the SPI communication.

[0035] In addition, the 29th port (CS) of the chip IC1 is connected with the 5th port (CS) of the chip IC2, and the chip select signal is provided from the chip IC1 to the chip IC2; and the 28th port (INT) of the chip IC1 is connected with the 17th port (INT) of the chip IC2, and the initialization signal is provided from the chip IC1 to the chip IC2.

[0036] The 1st port (CANL) and the 2nd port (CANH) of the chip IC2 are respectively connected with the 1st port and the 2nd port of the connector CN3, and the CAN signal transceiving is performed, the 1st port being the CAN low signal channel and the 2nd port being the CAN high signal channel.

[0037] Further, the 10th port and the 11th port of the chip IC2 are respectively connected with the digital ground DGND.

[0038] Preferably, the capacitor C9 and the capacitor C10 are connected in parallel between the 19th port of the chip IC1 and the digital ground DGND, forming a filter circuit for the 5V input of the chip IC1.

[0039] In addition, the power module includes the chip IC3 and the chip IC4, the chip IC3 of the power module is responsible for outputting the 5V power supply, and the chip IC4 of the power module is responsible for outputting the 3.3V power supply; specifically, the model of the chip IC3 is BP5293-50; and the model of the chip IC4 is BP5293-33.

[0040] Further, the 1st port of the chip IC3 and the 1st port of the chip IC4 are respectively connected with the 1st port of the connector CN1, the 3rd port of the chip IC3 and the 3rd port of the chip IC4 are respectively connected with the digital ground DGND, the 2nd port of the chip IC3 is connected with the 19th port of the chip IC1 and the 12th port of the chip IC2, and the 2nd port of the chip IC4 is connected with the 9th port of the chip IC2 and the 3rd port of the connector CN1. The chip IC3 and the chip IC4 obtain the analog vehicle BU power supply from the outside through the 1st port of the connector CN1 as the input of the power conversion, the 2nd port of the chip IC3 outputs the converted 5V, and the 2nd port of the chip IC4 outputs the converted 3.3V.

[0041] Further, the capacitor C11 is connected in series between the 1 port of the chip IC3 and the digital ground DGND, and forms a filter capacitor of the BU input of the chip IC3.

[0042] Further, the capacitor C12 is connected in series between the 2 port of the chip IC3 and the digital ground DGND, and forms a filter capacitor of the 5V output of the chip IC3.

[0043] Further, the capacitor C13 is connected in series between the 1 port of the chip IC4 and the digital ground DGND, and forms a filter capacitor of the BU input of the chip IC4.

[0044] Further, the capacitor C14 is connected in series between the 2 port of the chip IC4 and the digital ground DGND, and forms a filter capacitor of the 3.3V output of the chip IC4.

[0045] Further, the 2 port of the connector CN1 is connected to the digital ground DGND.

[0046] Working principle: the utility model discloses a BP5293-50 and BP5293-33 chip module connection automobile's battery is stabilized after voltage reduction and exports 5V and 3.3V voltage, and provides power supply support for central processing unit ESP32-WROOM-32E and CAN communication module ACAN2518FDClick.

[0047] The central processing unit receives vehicle signals from the vehicle signal level conversion circuit and key signals from the external key input through the pre-configured GPIO and ADC pins. The central processing unit ESP32-WROOM-32E can transmit the CAN instruction content to the CAN communication module (chip IC2 ACAN2518FDClick) through the configured SPI pins: GPIO23 (37 port) configured as SDI, GPIO19 (31 port) configured as SDO, GPIO18 (30 port) configured as SCK, and GPIO5 (29 port, CS) according to the mapping relationship of the pre-compiled CAN signal and external input signal, and convert the SPI signal to CAN signal through the module, and send it to the CAN bus of the cab environment through the CANL end and CANH end of the communication module, to realize the sending function of CAN signal. Similarly, the signals on the CAN bus can also be input to the communication module through the CANL end and CANH end connected by the connector CN3, and then transmitted to the central processing module through the SPI channel, to realize the receiving function of CAN signal.

[0048] The CAN transceiving device communicates with the CAN bus of the driver cabin according to the input of the external vehicle signal and the button, realizes the transceiving of the CAN signal, realizes the communication and control among each component of the driver cabin required in the vehicle-mounted machine authentication, solves the problems that the professionals cannot operate on the site in the authentication experiment and the CAN signal kit cost is high, the integrated module adopted in the design has low cost, good effect and simple structure, and is convenient to maintain.

[0049] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A communication transceiver device based on the CAN FD protocol, characterized in that, It includes a central processing unit and a CAN communication module; the central processing unit includes chip IC1, and the CAN communication module includes chip IC2; the model of chip IC1 is ESP32-WROOM-32Ede, and the model of chip IC2 is ACAN2518FDClick; Port 19 of chip IC1 and port 12 of chip IC2 are connected to the 5V power supply provided by the power module; port 9 of chip IC2 is connected to the 3.3V power supply provided by the power module. Port 3 of chip IC1 is connected to port 4 of connector CN1; port 4 of chip IC1 is connected to port 5 of connector CN1; port 5 of chip IC1 is connected to port 6 of connector CN1; port 6 of chip IC1 is connected to port 7 of connector CN1; port 7 of chip IC1 is connected to port 8 of connector CN1; port 8 of chip IC1 is connected to port 9 of connector CN1; port 9 of chip IC1 is connected to port 10 of connector CN1. Port 37 of chip IC1 is connected to port 8 of chip IC2; port 31 of chip IC1 is connected to port 7 of chip IC2; port 30 of chip IC1 is connected to port 6 of chip IC2. Port 29 of chip IC1 is connected to port 5 of chip IC2; port 28 of chip IC1 is connected to port 17 of chip IC2. Ports 1 and 2 of chip IC2 are connected to ports 1 and 2 of connector CN3 respectively.

2. The communication transceiver device based on the CAN FD protocol as described in claim 1, characterized in that, Ports 10 and 11 of chip IC2 are connected to digital ground DGND respectively.

3. A communication transceiver device based on the CAN FD protocol as described in claim 1, characterized in that, Capacitors C9 and C10 are connected in parallel between port 19 of chip IC1 and digital ground DGND.

4. A communication transceiver device based on the CAN FD protocol as described in claim 1, characterized in that, Ports 14, 38, and 32 of chip IC1 are connected to digital ground DGND.

5. A communication transceiver device based on the CAN FD protocol as described in claim 1, characterized in that, The power module includes chip IC3 and chip IC4. Chip IC3 is responsible for outputting 5V power, and chip IC4 is responsible for outputting 3.3V power. The model number of chip IC3 is BP5293-50, and the model number of chip IC4 is BP5293-33.

6. A communication transceiver device based on the CAN FD protocol as described in claim 5, characterized in that, Port 19 of chip IC1 and port 12 of chip IC2 are connected to port 2 of chip IC3 respectively; port 9 of chip IC2 is connected to port 2 of chip IC4.

7. A communication transceiver device based on the CAN FD protocol as described in claim 5, characterized in that, Port 1 of chip IC3 and port 1 of chip IC4 are connected to port 1 of connector CN1, respectively. Port 3 of chip IC3 and port 3 of chip IC4 are connected to digital ground DGND, respectively. Port 2 of chip IC3 is connected to port 19 of chip IC1 and port 12 of chip IC2, respectively. Port 2 of chip IC4 is connected to port 9 of chip IC2 and port 3 of connector CN1, respectively. Chips IC3 and IC4 obtain the simulated vehicle BU power supply from the outside through port 1 of connector CN1 as the input for power conversion. Port 2 of chip IC3 outputs the converted 5V, and port 2 of chip IC4 outputs the converted 3.3V.

8. A communication transceiver device based on the CAN FD protocol as described in claim 5, characterized in that, A capacitor C11 is connected in series between port 1 of chip IC3 and digital ground DGND; a capacitor C12 is connected in series between port 2 of chip IC3 and digital ground DGND.

9. A communication transceiver device based on the CAN FD protocol as described in claim 5, characterized in that, A capacitor C13 is connected in series between port 1 of chip IC4 and digital ground DGND; a capacitor C14 is connected in series between port 2 of chip IC4 and digital ground DGND.

10. A communication transceiver device based on the CAN FD protocol as described in claim 1, characterized in that, Connect port 2 of connector CN1 to digital ground DGND.

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