初一关于科技的英语演讲的英语作文大约3分钟

初一关于科技的英语演讲的英语作文大约3分钟！急求！小女子在这谢谢您们了！今晚8点前回复者有赏！我QQ：851729414

The control of Electronic Communication
With computer technology, communications technology, the rapid development of integrated circuit technology to all-digital fieldbus-represented on-site control instruments, equipment, a large number of applications, the traditional site of the control technology and control equipment at the scene has changed dramatically. The site was cumbersome to connect a single simple field bus network in place of the system design flexibility, easy maintenance, quality of the signal transmission is also greatly enhanced, in order to control the on-site industrial users tremendous advantages. After a long period of development, has become Hart, Lonworks, Profibus, Bitbus and a variety of on-site, such as CAN bus protocol.
With the rapid development of electronic technology in the car and on the wider use of electronic vehicle becoming more, especially micro-controller into the car in the field of control, to the development of the automobile has brought epoch-making changes in the car driving force, Stability operations, safety, fuel economy, environmental friendliness have been increased dramatically.
The application of a large number of electronic devices, wiring body is bound to lead to the more complicated the longer run to reduce the reliability, fault repairs difficult. In particular the electronic control unit of the large scale introduction, in order to raise the utilization rate of the signal, a large number of requests for information in various electronic units shared, integrated vehicle control system in a large number of control signals need to exchange real-time, Cambodia has been far from the traditional line This can not meet the demand. In response to these problems, the choice of network technology in computer network technology from the scene and control technology on the basis of the development of the automobile environment applies to all kinds of car networking technology.
And other on-site control, the car temperature range (-45-100 ℃), electromagnetic interference and other electronic noise-keung, environment, network reliability in the operation of the car is especially important that this not only reflected in the structure of the network itself The fault-tolerance and anti-interference ability, but also in the signal encoding and transmission methods. Automotive LAN, without exception, have adopted a serial synchronous transmission, data and the PWM signal the use of NRZ encoding, bit rate is usually higher than that of NRZ encoded using 100kbps, which is lower than 100kbps encoding using PWM.
Many well-known international car company in the early 80's on the active network dedicated to automotive technology research and application. To date, a variety of network standards such as SAE's J1850, Germany's public ABUS, the Bosch CAN, the American Business Machines AutoCAN, ISO's VAN, such as Mazda's PALMNET.
In accordance with China's automotive electronics technology development planning, into the 21st century car electronics up to the level of 90 foreign countries, will also be a large number of intelligent electronic control unit was introduced. To shorten the car with foreign skills, improve their own competitiveness, relying on technology alone is not conducive to long-term growth, digestion, absorption, research and development of its own network of automotive applications is imperative