CN221149182U

CN221149182U - Vehicle remote monitoring equipment based on CAN bus

Info

Publication number: CN221149182U
Application number: CN202322856528.6U
Authority: CN
Inventors: 陈泽坚; 周晓云; 叶寒
Original assignee: Wuhu Etec Automotive Electronics Co ltd
Current assignee: Wuhu Etec Automotive Electronics Co ltd
Priority date: 2023-10-24
Filing date: 2023-10-24
Publication date: 2024-06-14
Anticipated expiration: 2033-10-24

Abstract

The utility model discloses a vehicle remote monitoring device based on a CAN bus, and belongs to the technical field of automobile remote monitoring. The device is respectively connected with the server and the vehicle built-in system and comprises a CAN bus interface module, a data processing module and a remote communication module, wherein the data processing module is respectively connected with the CAN bus interface module and the remote communication module, the remote communication module is in wireless connection with the server, and the CAN bus interface module is connected with the vehicle built-in system. The utility model has high reliability and safety, has the functions of real-time monitoring, fault diagnosis and data acquisition, and can effectively reduce the energy consumption of the vehicle battery and improve the battery utilization rate.

Description

Vehicle remote monitoring equipment based on CAN bus

Technical Field

The utility model belongs to the technical field of automobile remote monitoring, and particularly relates to a vehicle remote monitoring device based on a CAN bus.

Background

With the continued development of automotive technology, vehicle systems have become increasingly complex. In the development and manufacturing process of automobiles, comprehensive data acquisition and analysis of various subsystems of the vehicle are required to ensure reliability and safety of vehicle performance. In the development stage, data acquisition and analysis are critical to understanding performance of automobiles, to detect potential problems, and to optimize and improve. Traditional data acquisition methods generally require manual intervention, are time-consuming and laborious, and are prone to error. Moreover, the traditional data acquisition mode can only acquire limited data, and cannot comprehensively reflect the actual state of the vehicle. Meanwhile, analysis after data acquisition also requires a great deal of time and effort, and important information is easy to miss. To solve these problems, vehicle remote monitoring technologies have been developed. The technology utilizes the CAN bus and the wireless communication technology on the vehicle to realize remote acquisition and monitoring of vehicle data. By integrating the system with a vehicle-mounted system, the real-time state of each subsystem of the vehicle can be monitored in real time, wherein the real-time state comprises an engine, a transmission system, a suspension system and the like. Meanwhile, through data processing and analysis, accurate fault diagnosis results and optimization suggestions can be provided, and developers are helped to make effective decisions and improvements.

The comparison document (CN 217932792U) discloses a remote monitoring device integrated with an automobile event data recording system, one end of the remote monitoring device is connected to a battery power supply and a CAN bus of a vehicle through a bus interface, the other end of the remote monitoring device is connected to a remote monitoring platform, and the remote monitoring device comprises: the system comprises a main control circuit, a power supply circuit connected to the main control circuit, a CAN acquisition circuit, a storage circuit, an accelerometer circuit, an RS232 communication circuit, a 4G module and a positioning module. The remote monitoring device does not need to additionally install an independent automobile event recording device, reduces the material and assembly cost of the whole automobile, simultaneously saves the installation space of parts in the automobile, and reduces the complexity of layout and wiring.

The above patent shows that the CAN bus is an important technology for implementing remote monitoring of the vehicle, the reliability and safety of the CAN bus interface circuit affect the operation of the whole device, the above reference document does not propose a CAN bus interface circuit with high reliability and safety, and meanwhile, the reference document connects one end of the remote monitoring device with the battery power supply of the vehicle to provide power, however, the remote monitoring device needs to monitor the state of the vehicle in real time, and if the vehicle remote monitoring device is always in a certain working state, the loss of the vehicle battery and the resource waste CAN be caused.

Disclosure of utility model

The utility model aims to overcome the defects of the prior art, provides a vehicle remote monitoring device based on a CAN bus, so as to achieve the purposes of efficiently, simply, accurately and accurately tracking and monitoring vehicle information with low cost, realizing remote monitoring, fault diagnosis and data acquisition of the vehicle, and simultaneously having a CAN bus interface circuit with high reliability and safety and being capable of improving the utilization rate of a vehicle body battery.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: the device comprises a CAN bus interface module, a data processing module and a remote communication module, wherein the data processing module is respectively connected with the CAN bus interface module and the remote communication module, the remote communication module is in wireless connection with the server, and the CAN bus interface module is connected with the vehicle built-in system.

The data processing module comprises an ESP32 main control chip, and the ESP32 main control chip is respectively connected with the CAN bus interface module and the remote communication module.

The remote communication module comprises a WiFi antenna, and the WiFi antenna is in wireless connection with the server through a TCP/IP protocol.

The CAN bus interface module comprises a CAN transceiver, and the CAN transceiver is connected with a vehicle built-in system through a CAN bus.

The CAN bus interface module comprises a CAN interface circuit, the CAN interface circuit comprises resistors R1, R2 and R3, capacitors C1, C2, C3 and C4, a CAN transceiver chip and an electrostatic suppressor, wherein a receiving data output interface RXD of the CAN transceiver chip is connected with the data processing module, a transmitting data input interface TXD of the CAN transceiver chip is connected with the data processing module, a grounding interface GND of the CAN transceiver chip is grounded, an enabling interface STB of the CAN transceiver chip is used as a CAN transceiver control signal input interface through a resistor R1 leading-out terminal, a power supply interface VCC of the CAN transceiver chip is connected with a positive power supply VCC, a high-level interface of the CAN transceiver chip is connected with a CAN bus high level, a low-level interface of the CAN transceiver chip is connected with a CAN bus low level, and a numerical control interface NC of the CAN transceiver chip is connected with the CAN bus high level through a resistor R2; one end of the capacitor C1 is grounded, and the other end of the capacitor C is connected with a positive power supply VCC; the first end of the capacitor C2 is connected with the high-level interface of the CAN transceiver chip, the second end of the capacitor C3 is connected with the first end of the capacitor C3, and the second end of the capacitor C3 is connected with the low-level interface of the CAN transceiver chip; the common cathode 3 port of the static suppressor is grounded and connected with the second end of the capacitor C2, one cathode 2 port of the static suppressor is connected with the second end of the capacitor C3, and the other cathode 1 port of the static suppressor is connected with the first end of the capacitor C2; the first end of the resistor R3 is connected with a numerical control interface of the CAN transceiver chip, and the second end of the resistor R3 is connected with a CAN bus low level; the first end of the capacitor C4 is connected with the first end of the resistor R3, and the second end of the capacitor C4 is grounded. The model of the CAN transceiver chip is TCAN1042D-Q1, and the model of the static suppressor is PESD2IVN24-T.

The vehicle built-in system comprises an on-board automatic diagnosis system OBD and an automobile electric control unit ECU, and the data processing module uses an automobile unified diagnosis service protocol UDS and performs data transmission with the automobile electric control unit ECU built-in the vehicle through a CAN bus of the on-board automatic diagnosis system OBD.

The CAN bus interface module is used for connecting with the vehicle and carrying out data interaction through a CAN bus of the vehicle to acquire real-time data of each subsystem arranged in the vehicle; the data processing module is used for analyzing and processing the vehicle data acquired from the CAN bus interface module; the remote communication module is used for transmitting the data processed by the data processing module to a server through wireless network connection.

When the remote communication module does not receive the remote signal of the server and the CAN bus interface module does not receive the signal of the vehicle built-in system, the ESP32 main control chip is switched to a low power consumption state.

The utility model has the technical effects that: 1. the device can remotely monitor the vehicle in real time, is convenient for finding and solving problems in time, and ensures the safety and reliability of the vehicle; 2. the device can be communicated with an OBD (on-board diagnostics) and an ECU (electronic control unit) of the vehicle, and is used for deeply analyzing vehicle data, excavating the root cause of a problem and providing long-term performance optimization suggestions; 3. the ESP main control chip has a sleep mode, so that the battery consumption of the vehicle body can be reduced to improve the utilization rate; 4. the CAN bus interface circuit has high reliability and high safety.

Drawings

FIG. 1 is a block diagram of a vehicle remote monitoring device based on a CAN bus;

Fig. 2 is a CAN bus interface circuit diagram of a CAN bus-based vehicle remote monitoring device.

Detailed Description

The following detailed description of the embodiments of the utility model, given by way of example only, is presented in the accompanying drawings to aid those skilled in the art in a more complete, accurate and thorough understanding of the inventive concepts and aspects of the utility model, and to facilitate their practice.

A vehicle remote monitoring device based on a CAN bus is shown in figure 1, the device is respectively connected with a server and a vehicle built-in system, the device comprises a CAN bus interface module, a data processing module and a remote communication module, wherein the data processing module is respectively connected with the CAN bus interface module and the remote communication module, the remote communication module is in wireless connection with the server, and the CAN bus interface module is connected with the vehicle built-in system.

The data processing module comprises an ESP32 main control chip, and the ESP32 main control chip is respectively connected with the CAN bus interface module and the remote communication module. The embodiment uses the home-made Le Xin ESP32 as a main control chip, the dual-core CPU of the chip has the highest main frequency reaching 240M, the CAN bus is arranged outside the chip, the chip CAN be conveniently connected to the CAN bus on an OBD (on-board diagnostic) port of an automobile, meanwhile, a Wifi module is arranged inside the chip, the chip CAN be connected to a server end for data remote communication, meanwhile, the ESP32 main control chip is provided with a sleep mode, namely a low-power consumption state, the self current consumption CAN be reduced, and the sleep mode of the ESP32 main control chip is the prior art. When the remote communication module does not receive the remote signal of the server and the CAN bus interface module does not receive the signal of the vehicle built-in system, the ESP32 main control chip is switched to a low-power consumption state, and the equipment is defined to be in a sleep mode, so that the quiescent current of the whole device is greatly reduced, and the remote signal or the wake-up of the CAN bus is waited. The low-power consumption state realizes the standby requirement of the whole vehicle for a longer time, and improves the utilization rate of the battery of the vehicle body.

The remote communication module comprises a WiFi antenna which is in wireless connection with the server through a TCP/IP protocol, can receive remote signals of the server, and can transmit data to the server through a wireless communication technology.

Further, the CAN bus interface module provides a CAN interface circuit with high reliability and safety, in this embodiment, as shown in fig. 2, the CAN interface circuit includes 1KR resistor R1, 62R resistor R2, 62R resistor R3, 10nF capacitor C1, 100pF capacitor C2, 100pF capacitor C3, 10nF capacitor C4, CAN transceiver chip uses TCAN1042D-Q1, electrostatic suppressor uses PESD2IVN24-T, wherein a receiving data output interface RXD of the CAN transceiver chip is connected with the data processing module, a transmitting data input interface TXD of the CAN transceiver chip is connected with the data processing module, a ground interface GND of the CAN transceiver chip is grounded, an enabling interface STB of the CAN transceiver chip is used as a CAN transceiver control signal input interface through a resistor R1 lead-out terminal, a power supply interface VCC of the CAN transceiver chip is connected with a positive power supply, a high level interface of the CAN transceiver chip is connected with a high level of the CAN bus, a low level interface of the CAN transceiver chip is connected with a low level CAN bus, and a transmitting data input interface TXD of the CAN transceiver chip is connected with a high level NC of the CAN transceiver chip is connected with a digital control signal input interface NC through the VCC; one end of the capacitor C1 is grounded, and the other end of the capacitor C is connected with a positive power supply VCC; the first end of the capacitor C2 is connected with the high-level interface of the CAN transceiver chip, the second end of the capacitor C3 is connected with the first end of the capacitor C3, and the second end of the capacitor C3 is connected with the low-level interface of the CAN transceiver chip; the common cathode 3 port of the static suppressor is grounded and connected with the second end of the capacitor C2, one cathode 2 port of the static suppressor is connected with the second end of the capacitor C3, and the other cathode 1 port of the static suppressor is connected with the first end of the capacitor C2; the first end of the resistor R3 is connected with a numerical control interface of the CAN transceiver chip, and the second end of the resistor R3 is connected with a CAN bus low level; the first end of the capacitor C4 is connected with the first end of the resistor R3, and the second end of the capacitor C4 is grounded. The use of the electrostatic suppressor effectively ensures the reliability and safety of the whole interface circuit.

The vehicle built-in system comprises an on-board automatic diagnosis system OBD and an automobile electric control unit ECU, the data processing module uses an automobile unified diagnosis service protocol UDS and performs data transmission with the automobile built-in automobile electric control unit ECU through a CAN bus of the on-board automatic diagnosis system OBD, at the moment, equipment is defined to be in a diagnosis mode, and diagnosis engineers and developers CAN acquire and analyze detailed data of the vehicle in the diagnosis mode to realize fault diagnosis of the vehicle.

When the vehicle remote monitoring equipment works normally, the CAN bus interface module is used for connecting and data interaction with the vehicle through a CAN bus of the vehicle to acquire real-time data of each subsystem arranged in the vehicle; the data processing module is used for analyzing and processing the vehicle data acquired from the CAN bus interface module to generate a data result with high readability, namely, the received CAN message is processed to a certain extent to obtain the actually required data such as the physical information of the vehicle speed, the steering wheel angle, the brake pedal and the like; the remote communication module is used for transmitting the data processed by the data processing module to the server through wireless network connection to realize remote monitoring of the vehicle, equipment definition is in a real-time monitoring mode at the moment, in a simple way, in the real-time monitoring mode, the equipment CAN acquire information such as performance data, sensor data, control state and the like of each subsystem of the vehicle in real time through a CAN bus, and the data are transmitted to the server through a wireless communication technology. The developer can monitor and obtain real-time vehicle state feedback in real time so as to discover problems in time and take corresponding measures.

The device is divided into a real-time monitoring mode, a diagnosis mode and a sleep mode, and the three working mode devices can be switched through a remote command sent by a current user, so that vehicle data acquisition and analysis can be effectively carried out. The real-time monitoring mode is used for timely finding and solving problems and guaranteeing the safety and reliability of the vehicle; the diagnosis mode is used for deeply analyzing vehicle data, mining the root cause of the problem and providing long-term performance optimization suggestions; in sleep mode, ESP32 is put into sleep mode, thereby reducing power consumption. The combination of the three modes can improve the data processing capability and decision support of the automobile in the development stage, further improve the quality and performance of the automobile, and meanwhile, the battery electric quantity of the automobile is not influenced. Specifically, after the vehicle remote monitoring device is powered on and initialized, the vehicle remote monitoring device enters a real-time monitoring mode after receiving a real-time monitoring command from the server in a remote mode, or enters a diagnosis mode after receiving a diagnosis mode command from the server in a remote mode, and when the vehicle remote monitoring device is in one of the real-time monitoring mode and the diagnosis mode, the vehicle remote monitoring device can still receive the command to switch the mode; and when the CAN network has no message activity for more than one minute and the vehicle remote monitoring equipment does not receive a remote command for more than one minute, the vehicle remote monitoring equipment enters a sleep mode, and the sleep mode is ended until the CAN network has message activity or the equipment receives the remote command.

The utility model has the functions of real-time monitoring, fault diagnosis and data acquisition, can acquire and analyze the key data of the automobile in the development stage, can better know the performance of the automobile, can diagnose potential problems, and can optimize and improve the performance of the automobile.

The utility model is described above by way of example with reference to the accompanying drawings. It will be clear that the utility model is not limited to the embodiments described above. As long as various insubstantial improvements are made using the method concepts and technical solutions of the present utility model; or the utility model is not improved, and the conception and the technical scheme are directly applied to other occasions and are all within the protection scope of the utility model.

Claims

1. Vehicle remote monitoring equipment based on CAN bus, equipment is connected with server and vehicle built-in system respectively, its characterized in that: the device comprises a CAN bus interface module, a data processing module and a remote communication module, wherein: the data processing module is respectively connected with the CAN bus interface module and the remote communication module, the remote communication module is in wireless connection with the server, and the CAN bus interface module is connected with the vehicle built-in system; the CAN bus interface module comprises a CAN interface circuit, wherein the CAN interface circuit comprises a CAN transceiver chip and an electrostatic suppressor.

2. The CAN bus-based vehicle remote monitoring device of claim 1, wherein: the CAN interface circuit comprises resistors R1, R2 and R3, capacitors C1, C2, C3 and C4, a CAN transceiver chip and an electrostatic suppressor, wherein a receiving data output interface RXD of the CAN transceiver chip is connected with the data processing module, a transmitting data input interface TXD of the CAN transceiver chip is connected with the data processing module, a grounding interface GND of the CAN transceiver chip is grounded, an enabling interface STB of the CAN transceiver chip is used as a CAN transceiver control signal input interface through a resistor R1 leading-out terminal, a power supply interface VCC of the CAN transceiver chip is connected with a positive power supply VCC, a high-level interface of the CAN transceiver chip is connected with a CAN bus high level, a low-level interface of the CAN transceiver chip is connected with a CAN bus low level, and a numerical control interface NC of the CAN transceiver chip is connected with the CAN bus high level through a resistor R2; one end of the capacitor C1 is grounded, and the other end of the capacitor C is connected with a positive power supply VCC; the first end of the capacitor C2 is connected with the high-level interface of the CAN transceiver chip, the second end of the capacitor C3 is connected with the first end of the capacitor C3, and the second end of the capacitor C3 is connected with the low-level interface of the CAN transceiver chip; the common cathode 3 port of the static suppressor is grounded and connected with the second end of the capacitor C2, one cathode 2 port of the static suppressor is connected with the second end of the capacitor C3, and the other cathode 1 port of the static suppressor is connected with the first end of the capacitor C2; the first end of the resistor R3 is connected with a numerical control interface of the CAN transceiver chip, and the second end of the resistor R3 is connected with a CAN bus low level; the first end of the capacitor C4 is connected with the first end of the resistor R3, and the second end of the capacitor C4 is grounded.

3. A vehicle remote monitoring device based on CAN bus according to claim 1 or 2, characterized in that: the data processing module comprises an ESP32 main control chip, and the ESP32 main control chip is respectively connected with the CAN bus interface module and the remote communication module.

4. A vehicle remote monitoring device based on CAN bus according to claim 1 or 2, characterized in that: the remote communication module comprises a Wifi antenna, and the Wifi antenna is in wireless connection with the server through a TCP/IP protocol.

5. A vehicle remote monitoring device based on CAN bus according to claim 1 or 2, characterized in that: the CAN bus interface module comprises a CAN transceiver, and the CAN transceiver is connected with a vehicle built-in system through a CAN bus.

6. A vehicle remote monitoring device based on CAN bus according to claim 1 or 2, characterized in that: the model of the CAN transceiver chip is TCAN1042D-Q1, and the model of the static suppressor is PESD2IVN24-T.

7. A vehicle remote monitoring device based on CAN bus according to claim 1 or 2, characterized in that: the vehicle built-in system comprises an on-board automatic diagnosis system OBD and an automobile electric control unit ECU, and the data processing module uses an automobile unified diagnosis service protocol UDS and performs data transmission with the automobile electric control unit ECU built-in the vehicle through a CAN bus of the on-board automatic diagnosis system OBD.

8. A vehicle remote monitoring device based on CAN bus according to claim 1 or 2, characterized in that: the CAN bus interface module is used for connecting with the vehicle and carrying out data interaction through a CAN bus of the vehicle to acquire real-time data of each subsystem arranged in the vehicle; the data processing module is used for analyzing and processing the vehicle data acquired from the CAN bus interface module; the remote communication module is used for receiving the remote command of the server and transmitting the data processed by the data processing module to the server through wireless network connection.

9. A CAN bus based vehicle remote monitoring device as defined in claim 3, wherein: when the remote communication module does not receive the remote signal of the server and the CAN bus interface module does not receive the signal of the vehicle built-in system, the ESP32 main control chip is switched to a low power consumption state.