CAN Transceiver Research Articles

CIS-based system for acquiring and transmitting image data

The design utilizes a network of CIS lines (DL520-09UHM-S) to design an image data acquisition and transmission system. Using the STM32F1 chip as the control core, the hardware circuit of STM32F1 with DL520-09UHM-S, A/D converter chip, FIFO cache chip and CAN transceiver chip is designed, and the parameters of each device are controlled to complete the acquisition and transmission of image data. The PC processes the data through software to derive the acquired image data.

Automation of Engine ECU Calibration through CAN with Python Machine Learning Algorithms

Engine ECU subsume the numerous control functions of electrical systems in the vehicle based on various sensors inputs and the control parameters present inside ECU such as maps, multiplication factors, constants and so on. These control parameters need to be calibrated effectively for better performance as well as to meet stringent emission norms. Since, the most efficient way of calibration is through CAN by means of XCP/CCP protocol, this process involves logging and processing of the ECU data to estimate the appropriate values followed by downloading the modified values to the ECU manually. Even though from theoretical calculations it is possible to estimate the approximate parameter values, these values need to be validated in engine test beds or on road and are fine tuned to attain the optimum results by repeating the same trial under same test conditions numerous times. After each trial, the data is analyzed and new set of data is determined which is downloaded to ECU before the next trial. This process is carried out until optimum results are achieved which is time consuming. In this paper, a new approach has been explained which will eliminate the human interference during the trials and speeds up the process of establishing the master slave communication between PC and ECU through any CAN transceiver hardware with the help of python, and its machine learning algorithms to carry out the analysis tasks between successive trials which develops regression models for predicting the parameter values based on the previous trials with in a shorter period of time increasing the human potential of calibration.

The Research and implementation of high-speed Master-slave CAN-FD composite system based on Cortex-M7

All CAN bus is widely used in communication and control between electronic control units of automobiles. At present, the rapid development of intelligent network system has put forward higher requirements on the speed, capacity, reliability and stability of real-time data exchange.In this paper, the microcontroller based on Cortex-M7 architecture and the third-generation high-speed CAN transceiver are selected to build the interface module. According to the high-level CAN communication protocol, the control command is sent and the fault diagnosis and status monitoring is carried out in real time. At the same time, the industrial data from the signal processing module is received and stored. The test results show that the interface system is configured with several groups of filters of different interception modes based on the dual-channel CAN-FD communication, realizing higher transmission rate, longer data frames and multiple frame sending and receiving and is downward compatible with BxCAN. It has the characteristics of strong comprehensive performance, high reliability, portability and versatility. It also provides theoretical verification and data support for the optimization design and application of CAN bus in domestic industrial products.

Design of Inclinometer Based On STM32

This paper introduces an angle sensor based on STM32 microprocessor. Firstly, it introduces the power circuit module. Then it analyzes the angle acquisition principle and signal output type of MPU9250, then analyzes the CAN transceiver module, and finally introduces the software architecture. The sensor has a CAN output interface that can be directly applied to the CAN network architecture. The experimental results show that the sensor measurement accuracy reaches ±0.1°, which can meet the needs of industrial angular position measurement.

New Standardized EMC Evaluation Methods for Communication Transceivers

This letter introduces EMC evaluation methods and requirements for communication transceiver integrated circuits (ICs) described in the new International Electronic Commission standard series IEC62228. Based on typical results of CAN transceivers, a cross comparison of measurement results on IC level, component level, and vehicle level will be provided. The correlation of results and the potential to harmonize requirements in respect to test methods and effort will be discussed.

A Robust Load Balancing and Routing Protocol for Intra-Car Hybrid Wired/Wireless Networks

With the emergence of connected and autonomous vehicles, sensors are increasingly deployed within cars to support new functionalities. Traffic generated by these sensors congest traditional intra-car networks, such as CAN buses. Furthermore, the large amount of wires needed to connect sensors makes it harder to design cars in a modular way. To alleviate these limitations, we propose, simulate, and implement a hybrid wired/wireless architecture, in which each node is connected to either a wired interface or a wireless interface or both. Specifically, we propose a new protocol, called Hybrid-Backpressure Collection Protocol (Hybrid-BCP) , to efficiently collect data from sensors in intra-car networks. Hybrid-BCP is backward-compatible with the CAN bus technology, and builds on the BCP protocol, designed for wireless sensor networks. We theoretically prove that an idealized version of Hybrid-BCP achieves optimal throughput. Our testbed implementation, based on CAN and ZigBee transceivers, demonstrates the load balancing and routing functionalities of Hybrid-BCP and its resilience to DoS attacks and wireless jamming attacks. We further provide simulation results, obtained with the ns-3 simulator and based on real intra-car RSSI traces, that compare between the performance of Hybrid-BCP and a tree-based data collection protocol. Notably, the simulations show that Hybrid-BCP outperforms the tree-based protocol on throughput by 12 percent. The results also show that Hybrid-BCP maintains high packet delivery rate and low packet delay for safety-critical sensors that are directly connected to the sink through wire.

A thermal protection module for automotive integrated circuits

Automotive ICs work in wide ambient temperature range up to 150[Formula: see text]C. It is important to design an over temperature protection mechanism for the reliability of ICs and systems. A thermal protection module for the automotive ICs is reported in this paper. Dual channel detection and decision scheme was designed based on band gap voltage reference. Precision thermal protection point was set by serial resistors and the variations of power supply, temperature and the process were removed by the resistor ratio. The thermal protection module was implemented in CSMC 0.5 [Formula: see text] 60 V BCD process, incorporated in a CAN transceiver chip. The area of the module was about 0.02 mm2 and thus it was very compact and low cost to integrate in chips. The performance of the thermal protection parameters was measured in incubators. The thermal shutdown temperature was about 164.4[Formula: see text]C and the thermal recovery temperature was about 153[Formula: see text]C with hysteresis temperature of 10 K. Additionally, the thermal protection module showed good consistency with different chips.

The Design of a Portable Control Module Based on TMS320C6748 and FPGA

This paper proposes a portable control module based on TMS320C6748 and FPGA. We take advantage of the rich interface resources of TMS320C6748, including LCD/DDR2/Ethernet/ EMIF/uPP etc. And we also use FPGA plus the PCI bridge chip, UART transceiver and CAN transceiver to realize the system control module. This control module includes interactive module, memory module and communication module. The control module has the characteristics of low power consumption, high reliability and low cost. It can replace the general-purpose CPU board in the field of portable test and meet the resources and performance requirements. So it has great application value.

Implementation of Protocol Conversion Control Board for Industrial Communication

Recently, many industrial instruments faced the problem of protocol compatibility with the external monitoring and control system. This is due to different environments, field bus devices and protocols. Therefore, it needs to deal with the problem on how to communicate with each other between different protocols. For this purpose, this study is implemented in the main control board and sub-communication board to support the industrial communication protocol conversion. The sub-communication board is designed to ensure the communication connection of CAN bus and Ethernet. The ATmega 2560 microcontroller is used as the processor of the main control board and 4 RS485 serial slots for sub-board are placed too. One of those is used to communicate CAN bus and Ethernet. The sub-communication board is consisted of the ATmega 128 microcontroller, CAN Transceiver and Ethernet connecter. The performance test results have successfully showed the transmission and conversion.

Driver of CAN BUS Based on ARM Cortex-M3

This paper designed and implemented a driver of CAN bus based ARM Cortex-M3. Combined with CAN bus technology, the paper introduces the hardware design based on STM32F205, a latest 32 bits microchip and CAN transceiver SN65HVD232. The design of CAN communication protocol and the program of software are described. The relevant key technology such as initialization, interrupt and data structure are illuminated. Experiments have verified the CAN bus driver is feasible, stabile and reliable.

The Design of a Low Cost CANopen Slave Node Based on STC90C514RD

CANopen is a kind of higher layer protocol based on CAN, and it is widely used in industrial automation field, especially in distributed motion control systems. The paper presents an approach of realizing CANopen slave node. Microcontroller STC90C514RD is used as a core chip to design the control system; the design adopts CTM1050 as the CAN transceiver and uses SJA1000 as the CAN controller. And the system consists of a CANopen slave node, input module and output module. MicroCANopen, which is an open source protocol stack of CANopen, is transplanted to main controller so that the function of CANopen could be implemented. Moreover the experimental platform is built to test the design of the system. The results prove that the design is feasible and valid.

Research and Design of the CAN/LIN Gateway Circuit in Vehicle

In this paper, a CAN/LIN gateway hardware design is completed. In the hardware framework of the CAN/LIN gateway, Philipss LPC2119 independent CAN and LIN transceiver based on ARM7-TDMI is used for making a CAN control circuit board. In the meantime, an automobile light network control diagram is given, ATMEL 89C52 series MCU is used for automobile light control network nodes, and also the circuit for automobile light control network nodes is made successfully.

Design of the Circuits for a CMOS CAN Transceiver Chip with Slew Rate Control

In this paper, the design of a CMOS transceiver circuits for CAN bus based on 0.5μm n-well CMOS process is presented. It has the advantages of high speed, high driving capability and strong anti-interference capability. It is mainly made up of a receiver and a transmitter which includes the input stage circuit, the middle stage circuit, the slew rate control circuit and the output stage circuit. With five cascaded inverters, the middle stage circuit can provide a high driving current and a small delay. In the slew rate control circuit, due to a variable charge or discharge current source, the slew rate of output signal could be adjusted continuously by an external resistance Rs. So it is very convenient for the chip to be applied in different modes and at different rates. The output stage circuit has the function of short-circuit protection, overvoltage and undervoltage protection. The receiver circuit is a hysteresis comparator introduced by a positive feedback to reduce the differential noise effectively, and it has a small temperature coefficient too. Hspice simulation results show that the transceiver meets the ISO-11898 standards and could operate at the rate of 1Mbit/s.

Communication System Design Based on TMS320F2407 with CAN Bus

In order to keep the communication fast and stable between a variety of control modules, the CAN bus communication system was designed in this paper. CAN bus communication system was designed as follow: the eCAN module of DSP chip TMS320F2407 was applied as CAN controller and the chip SN65HVD230 was applied as CAN transceiver, a variety of control modules was linked by the bus. For illustration, the chassis communication of a security robot is utilized to show how the CAN bus works. Empirical results show that the chassis communication of robot security is fast and stable with CAN bus. The CAN bus communication system designed in this paper can solve the unstable problem in the communication between control modules; it can be promoted to other control system.

Node Design of Alarming System for Coal Gas Based on AT89C55WD and CAN Bus

According to the performance and features of AT89C55WD and CAN bus, a nod design method of alarming system for coal gas based on AT89C55WD and CAN bus is proposed in this paper. The hardware structure and the design process of software are discussed in detail. The hardware system consists of microprocessor AT89C55WD, CAN controller SJA1000 and CAN transceiver PCA82C250. Under the support of corresponding software, the gas density, temperature and humidity can be effectively monitored by this alarming system.