FlexRay is a new standard for network communication systems, which has been developed for future automotive applications. FlexRay communication controller (CC) is the core of the FlexRay protocol specification. Bus guardian (BG) is an optional electronic component. In this paper, we first design the FlexRay CC and BG protocol specifications and function modules using specification and description language (SDL). Then, the system is implemented using Verilog HDL based on the SDL source. The FlexRay design is synthesised using Samsung 0.35 μm technology and the operating frequency is above 76 MHz. To validate our designed FlexRay system, it is combined with sound source localisation system in robotics applications. The integrated system is implemented using ALTERA Excalibur ARM EPXA4F672C3. The system operates successfully as demonstrated in experimentation.
This paper designs and implements a data sparse-acquisition and transmission system for Wireless Sensor Network (WSN) based on Narrow Band-Internet of Things (NB-IoT) and Field-Programmable Gate Array (FPGA) for smart agriculture. The use of distributed wireless network nodes to collect agricultural environment information in a sparse sampling manner can overcome the disadvantages of limited bandwidth and significantly reduce the amount of data transmission, thereby helping to reduce the energy consumption of wireless network nodes and extend the use time. We use FPGA as the base station to receive the data collected by each node, and make full use of the advantages of parallel computing in FPGA for data recovery. And the method we used are matrix filling algorithm, which was named Latent Factor Model (LFM) in the recommendation system, and gradient descent algorithm. Finally, the recovered complete data will be transmitted to the cloud platform for display in the way of NB-IoT. NB-IoT is an emerging Wide Area Network (WAN) technology that has the advantages of supporting massive connections and being geographically unrestricted. The results show that the data can be perfectly recovered within the specified error range, and the algorithm runs nearly three times faster than the serial operation after adding parallel operations.
Distance is usually obtained by ultrasonic wave. This research breaks the rules. Here the information of distance is got by visual range, which has been one of popular fields for many years. In this paper, the advance alarm system uses image processing technology to calculate distance between two vehicles. The system can accurately obtain distance and alarm effectively. The system is implemented by FPGA (Filed Program Gate Array), ARM and image sensor and calculate the distance through visual range technology. The simulation environment is built by HBE-SoC-EXPERT II development platform.
The In-Vehicle Network System is a main channel to transmit electronic signals among each automotive node. In order to share the node information from both of chassis and body networks in automobiles, the gateway system is used to realize the communication between CAN and FlexRay systems. In this paper, a modified gateway system based on the node mapping method, the node slotting method, and the corresponding operation algorithm will be proposed. Through the modified gateway system, repeated remodifying problems are solved that is changes of information or ID during transmitting information between CAN and FlexRay systems. Additionally, improvements in the reliability and the amalgamation of the In-Vehicle Network System are shown in this paper.
In order to describe the time-delays and faults on continuous nonlinear descriptor system using T-S fuzzy model, an observer is proposed to estimate system states, actuator and sensor faults. A fuzzy state feedback controller is constructed for faults compensations. On the basic of Lyapunov stability theory, the proposed robust fault-tolerant control method ensures the closed-loop system to be robust stability even as faults occur. The actuator and sensor faults can be diagnosed and estimated in 0.2 seconds. The performance of the proposed design method is effective in simulations.
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