T-Box terminal hardware information acquisition circuit

Abstract

A T-Box terminal hardware information acquisition circuit is characterized in that the T-Box terminal hardware information acquisition circuit comprises a master control MCU, the master control MCU is in electric signal connection with a sensor acquisition module through an RS485 communication circuit, the master control MCU is in electric signal connection with a vehicle end data acquisition module through a CAN communication circuit, the master control MCU is connected with a 4G communication circuit, and the master control MCU is connected with a Bluetooth communication circuit and a positioning module. The TBOX serves as a vehicle end control host, collects vehicle end data and sensor data through the CAN communication circuit and the 485 communication circuit, collects the sensor data through the Bluetooth communication circuit, and finally transmits the data through the 4G communication module circuit.

Description

Technical Field

[0001] This utility model relates to the field of hardware device status information acquisition technology, specifically a T-Box terminal hardware information acquisition circuit. Background Technology

[0002] With the increasing number of vehicles equipped with T-BOX terminals, the transmission of vehicle status information to the main control unit for information calculation and the sending of control commands has become crucial.

[0003] However, while current vehicle status data can be easily collected by sensors, it is inconvenient to aggregate this data into the main control chip, making it unsuitable for the complex operating conditions of vehicles.

[0004] Therefore, there is an urgent need to provide a terminal hardware information acquisition circuit with stable transmission. Summary of the Invention

[0005] The purpose of this invention is to provide a terminal hardware information acquisition circuit with stable transmission to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A T-Box terminal hardware information acquisition circuit includes a main control MCU, which is electrically connected to a sensor acquisition module via an RS485 communication circuit, electrically connected to a vehicle-side data acquisition module via a CAN communication circuit, and electrically connected to a 4G communication module. The main control MCU is also electrically connected to a Bluetooth communication circuit and a positioning module.

[0008] The CAN communication circuit includes a TJA1044GJT communication chip U1. The TXD pin of the U1 chip is connected to the transmitting pin CANTX1, the GND pin is grounded, one branch of the VCC pin is connected to the OUT5V terminal, and the other branch is grounded through capacitor C1. The RXD pin is connected to the receiving pin CANRX1, and the SPLIT pin of the U1 chip is connected to the VCC_CAN terminal through resistor R119.

[0009] One end of resistor R3 is connected to pin CANL of CAN communication chip U1 via inductor L1, and the other end is connected to one end of resistor R1. The other end of resistor R1 is connected to pin CANH of CAN communication chip U1 via inductor L1. The connection point of resistor R1 and resistor R3 is grounded through capacitor C3.

[0010] One end of resistor R2 is connected to pin CANL of CAN communication chip U1 via inductor L1, and the other end is connected to pin CANH of CAN communication chip U1 via inductor L1.

[0011] One end of capacitor C2 is connected to pin CANL of CAN communication chip U1 via inductor L1, and the other end is connected to pin CANH of CAN communication chip U1 via inductor L1.

[0012] The STB pin of the CAN communication chip U1 is connected to the CAN1_CTL pin.

[0013] The CAN communication circuit is provided in two sets. The second CAN communication circuit includes the U4 chip with pin TXD connected to the transmitting pin CANTX2, pin GND grounded, pin VCC with one branch connected to the OUT5V terminal and the other branch grounded through capacitor C14, pin RXD connected to the receiving pin CANRX2, and pin SPLIT of the U4 chip connected to the VCC_CAN terminal through resistor R120.

[0014] One end of resistor R7 is connected to pin CANL of CAN communication chip U4 via inductor L2, and the other end is connected to one end of resistor R5. The other end of resistor R5 is connected to pin CANH of CAN communication chip U4 via inductor L2. The connection point of resistors R5 and R7 is grounded through capacitor C13.

[0015] One end of resistor R6 is connected to pin CANL of CAN communication chip U4 via inductor L2, and the other end is connected to pin CANH of CAN communication chip U4 via inductor L2.

[0016] One end of capacitor C15 is connected to pin CANL of CAN communication chip U4 via inductor L2, and the other end is connected to pin CANH of CAN communication chip U4 via inductor L2.

[0017] The STB pin of the CAN communication chip U4 is connected to the CAN2_CTL pin.

[0018] The Bluetooth communication circuit includes an HM111Z chip U35. Pin GND1 of chip U35 is directly grounded. One branch of pin VBAT is directly connected to the 3V3_BT terminal, and the other branch is grounded through capacitor C134. Another branch of pin VBAT is grounded through capacitor C128. Pin GND2 is directly grounded.

[0019] The GND3 pin of chip U35 is directly grounded, the RESET_P pin is connected to the RESET terminal through resistor R134, and the LED pin is connected to diode LED2 through R144.

[0020] Pin UART0_RXD is connected to the transmitting end USART2_TX_BT via resistor R128, and pin UART0_TXD is connected to the receiving end USART2_RX_BT via resistor R127.

[0021] The RS485 communication circuit includes a MAX3485 chip U208. Pin RO of chip U28 is connected to the receiver UART4_RX_485 through resistor R116. One branch of pin RE is connected to the 485_DE terminal, and the other branch is directly connected to pin DE. Pin DI is connected to the receiver UART4_TX_485 through resistor R117, and pin GND is directly grounded.

[0022] One end of resistor R111 is connected to pin A of chip U28 via resistor R115, and the other end is connected to pin B of chip U28 via resistor R113.

[0023] One end of Schottky diode D23 is connected to pin A of chip U28 through resistor R115, and the other end is connected to pin B of chip U28 through Schottky diode D24 and resistor R114.

[0024] One end of the Schottky diode D25 is connected to pin A of the chip U28 through resistor R115, and the other end is connected to pin B of the chip U28 through resistor R114.

[0025] Another branch of pin A is connected to the VCC_CAN terminal through resistor R112, and another branch of pin B is directly grounded through resistor R114.

[0026] One branch of the VCC pin is connected to the VCC_CAN terminal, and the other branch is directly grounded through capacitor C120.

[0027] The 4G communication module circuit includes a SIM card slot circuit, an ESD anti-static circuit, and a 3.3V to 1.8V level conversion circuit, which is connected to the main control MCU.

[0028] The beneficial effects of this utility model are:

[0029] As the vehicle-side control host, TBOX collects vehicle-side and sensor data through CAN and 485 communication circuits, collects sensor data through Bluetooth communication circuits, and finally transmits the data through a 4G communication module circuit. Attached Figure Description

[0030] To more clearly illustrate the solutions in this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the data acquisition and control circuit structure of this utility model.

[0032] Figure 2 This is a schematic diagram of the CAN communication circuit structure of this utility model.

[0033] Figure 3 This is a schematic diagram of the second CAN communication circuit structure of this utility model;

[0034] Figure 4 This is a schematic diagram of the Bluetooth communication circuit structure of this utility model.

[0035] Figure 5 This is a schematic diagram of the RS485 communication circuit structure of this utility model. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0037] 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 application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application, are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0038] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0040] A T-Box terminal hardware information acquisition circuit, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, it includes a main control MCU, which is electrically connected to the sensor acquisition module via an RS485 communication circuit, electrically connected to the vehicle-side data acquisition module via a CAN communication circuit, and electrically connected to a 4G communication module. The main control MCU is also electrically connected to a Bluetooth communication circuit and a positioning module.

[0041] The CAN communication circuit includes a TJA1044GJT communication chip U1. The TXD pin of the U1 chip is connected to the transmitting pin CANTX1, the GND pin is grounded, one branch of the VCC pin is connected to the OUT5V terminal, and the other branch is grounded through capacitor C1. The RXD pin is connected to the receiving pin CANRX1, and the SPLIT pin of the U1 chip is connected to the VCC_CAN terminal through resistor R119.

[0042] One end of resistor R3 is connected to pin CANL of CAN communication chip U1 via inductor L1, and the other end is connected to one end of resistor R1. The other end of resistor R1 is connected to pin CANH of CAN communication chip U1 via inductor L1. The connection point of resistor R1 and resistor R3 is grounded through capacitor C3.

[0043] One end of resistor R2 is connected to pin CANL of CAN communication chip U1 via inductor L1, and the other end is connected to pin CANH of CAN communication chip U1 via inductor L1.

[0044] One end of capacitor C2 is connected to pin CANL of CAN communication chip U1 via inductor L1, and the other end is connected to pin CANH of CAN communication chip U1 via inductor L1.

[0045] The STB pin of the CAN communication chip U1 is connected to the CAN1_CTL pin.

[0046] It adopts the TJA1044GJT CAN chip, a high-speed CAN transceiver with a data rate of 5Mbps and a power supply voltage of 4.5-5.5V; temperature range: -40°C to +85°C.

[0047] A common-mode inductor is used in series to suppress differential signal interference, and an ESD chip is designed to prevent damage from external surge static electricity.

[0048] The CAN communication circuit is provided in two sets. The second CAN communication circuit includes the U4 chip with pin TXD connected to the transmitting pin CANTX2, pin GND grounded, pin VCC with one branch connected to the OUT5V terminal and the other branch grounded through capacitor C14, pin RXD connected to the receiving pin CANRX2, and pin SPLIT of the U4 chip connected to the VCC_CAN terminal through resistor R120.

[0049] One end of resistor R7 is connected to pin CANL of CAN communication chip U4 via inductor L2, and the other end is connected to one end of resistor R5. The other end of resistor R5 is connected to pin CANH of CAN communication chip U4 via inductor L2. The connection point of resistors R5 and R7 is grounded through capacitor C13.

[0050] One end of resistor R6 is connected to pin CANL of CAN communication chip U4 via inductor L2, and the other end is connected to pin CANH of CAN communication chip U4 via inductor L2.

[0051] One end of capacitor C15 is connected to pin CANL of CAN communication chip U4 via inductor L2, and the other end is connected to pin CANH of CAN communication chip U4 via inductor L2.

[0052] The STB pin of the CAN communication chip U4 is connected to the CAN2_CTL pin.

[0053] The Bluetooth communication circuit includes an HM111Z chip U35. Pin GND1 of chip U35 is directly grounded. One branch of pin VBAT is directly connected to the 3V3_BT terminal, and the other branch is grounded through capacitor C134. Another branch of pin VBAT is grounded through capacitor C128. Pin GND2 is directly grounded.

[0054] The GND3 pin of chip U35 is directly grounded, the RESET_P pin is connected to the RESET terminal through resistor R134, and the LED pin is connected to diode LED2 through R144.

[0055] Pin UART0_RXD is connected to the transmitting end USART2_TX_BT via resistor R128, and pin UART0_TXD is connected to the receiving end USART2_RX_BT via resistor R127.

[0056] The selected chip is the Quectel HM111Z, with an operating voltage of 1.8-4.3V, supporting the BLE5.3 protocol, two UART serial ports, and an operating frequency of 2.4-2.483GHz.

[0057] LED indicator lights are used to display the data communication status of the Bluetooth module.

[0058] The RS485 communication circuit includes a MAX3485 chip U208. Pin RO of chip U28 is connected to the receiver UART4_RX_485 through resistor R116. One branch of pin RE is connected to the 485_DE terminal, and the other branch is directly connected to pin DE. Pin DI is connected to the receiver UART4_TX_485 through resistor R117, and pin GND is directly grounded.

[0059] One end of resistor R111 is connected to pin A of chip U28 via resistor R115, and the other end is connected to pin B of chip U28 via resistor R113.

[0060] One end of Schottky diode D23 is connected to pin A of chip U28 through resistor R115, and the other end is connected to pin B of chip U28 through Schottky diode D24 and resistor R114.

[0061] One end of the Schottky diode D25 is connected to pin A of the chip U28 through resistor R115, and the other end is connected to pin B of the chip U28 through resistor R114.

[0062] Another branch of pin A is connected to the VCC_CAN terminal through resistor R112, and another branch of pin B is directly grounded through resistor R114.

[0063] One branch of the VCC pin is connected to the VCC_CAN terminal, and the other branch is directly grounded through capacitor C120.

[0064] The RS485 communication circuit uses a MAX3485 bidirectional transceiver, operates at 2.97-3.63V, and has a communication rate of 12Mbps.

[0065] Schottky diode D25 protects the communication interface from damage caused by high-voltage power supply breakdown.

[0066] The 4G communication module circuit includes a SIM card slot circuit, an ESD anti-static circuit, and a 3.3V to 1.8V level conversion circuit, which is connected to the main control MCU.

[0067] The ESD anti-static circuit supports hot-swapping, and the 3.3V to 1.8V level conversion circuit is used for serial communication data conversion.

[0068] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A hardware information acquisition circuit for a T-Box terminal, characterized in that: It includes a main control MCU, which is electrically connected to the sensor acquisition module via an RS485 communication circuit, electrically connected to the vehicle-side data acquisition module via a CAN communication circuit, connected to a 4G communication circuit, and connected to a Bluetooth communication circuit and a positioning module.

2. The T-Box terminal hardware information acquisition circuit according to claim 1, characterized in that: The CAN communication circuit includes a TJA1044GJT communication chip U1. The TXD pin of the U1 chip is connected to the transmitting pin CANTX1, the GND pin is grounded, one branch of the VCC pin is connected to the OUT5V terminal, and the other branch is grounded through capacitor C1. The RXD pin is connected to the receiving pin CANRX1, and the SPLIT pin of the U1 chip is connected to the VCC_CAN terminal through resistor R119. One end of resistor R3 is connected to pin CANL of CAN communication chip U1 via inductor L1, and the other end is connected to one end of resistor R1. The other end of resistor R1 is connected to pin CANH of CAN communication chip U1 via inductor L1. The connection point of resistor R1 and resistor R3 is grounded through capacitor C3. One end of resistor R2 is connected to pin CANL of CAN communication chip U1 via inductor L1, and the other end is connected to pin CANH of CAN communication chip U1 via inductor L1. One end of capacitor C2 is connected to pin CANL of CAN communication chip U1 via inductor L1, and the other end is connected to pin CANH of CAN communication chip U1 via inductor L1. The STB pin of the CAN communication chip U1 is connected to the CAN1_CTL pin.

3. The T-Box terminal hardware information acquisition circuit according to claim 2, characterized in that: The CAN communication circuit is configured with two sets. The second CAN communication circuit includes the U4 chip with pin TXD connected to the transmitting pin CANTX2, pin GND grounded, pin VCC with one branch connected to the OUT5V terminal and the other branch grounded through capacitor C14, pin RXD connected to the receiving pin CANRX2, and pin SPLIT of the U4 chip connected to the VCC_CAN terminal through resistor R120. One end of resistor R7 is connected to pin CANL of CAN communication chip U4 via inductor L2, and the other end is connected to one end of resistor R5. The other end of resistor R5 is connected to pin CANH of CAN communication chip U4 via inductor L2. The connection point of resistors R5 and R7 is grounded through capacitor C13. One end of resistor R6 is connected to pin CANL of CAN communication chip U4 via inductor L2, and the other end is connected to pin CANH of CAN communication chip U4 via inductor L2. One end of capacitor C15 is connected to pin CANL of CAN communication chip U4 via inductor L2, and the other end is connected to pin CANH of CAN communication chip U4 via inductor L2. The STB pin of the CAN communication chip U4 is connected to the CAN2_CTL pin.

4. The T-Box terminal hardware information acquisition circuit according to claim 1, characterized in that: The Bluetooth communication circuit includes an HM111Z chip U35. Pin GND1 of chip U35 is directly grounded. One branch of pin VBAT is directly connected to the 3V3_BT terminal, and the other branch is grounded through capacitor C134. Another branch of pin VBAT is grounded through capacitor C128. Pin GND2 is directly grounded. The GND3 pin of chip U35 is directly grounded, the RESET_P pin is connected to the RESET terminal through resistor R134, and the LED pin is connected to diode LED2 through R144. Pin UART0_RXD is connected to the transmitting end USART2_TX_BT via resistor R128, and pin UART0_TXD is connected to the receiving end USART2_RX_BT via resistor R127.

5. The T-Box terminal hardware information acquisition circuit according to claim 1, characterized in that: The RS485 communication circuit includes a MAX3485 chip U208. Pin RO of chip U28 is connected to the receiver UART4_RX_485 through resistor R116. One branch of pin RE is connected to the 485_DE terminal, and the other branch is directly connected to pin DE. Pin DI is connected to the receiver UART4_TX_485 through resistor R117, and pin GND is directly grounded. One end of resistor R111 is connected to pin A of chip U28 via resistor R115, and the other end is connected to pin B of chip U28 via resistor R113. One end of Schottky diode D23 is connected to pin A of chip U28 through resistor R115, and the other end is connected to pin B of chip U28 through Schottky diode D24 and resistor R114. One end of the Schottky diode D25 is connected to pin A of the chip U28 through resistor R115, and the other end is connected to pin B of the chip U28 through resistor R114. Another branch of pin A is connected to the VCC_CAN terminal through resistor R112, and another branch of pin B is directly grounded through resistor R114. One branch of the VCC pin is connected to the VCC_CAN terminal, and the other branch is directly grounded through capacitor C120.

6. The T-Box terminal hardware information acquisition circuit according to claim 1, characterized in that: The 4G communication module circuit includes a SIM card slot circuit, an ESD anti-static circuit, and a 3.3V to 1.8V level conversion circuit, which is connected to the main control MCU.

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