汽车专业英语读译教程 作者 宋进桂_ 22-U13TA.ppt

UNIT 13 AUTOMOTIVE COMPUTERS ANDCOMMUNICATION SYSTEMTEXT A Computers on Modern Vehicles  TEXT A Computers on Modern Vehicles ComputersCentral Processing UnitTemporary Computer MemoryPermanent Computer MemoryComputer Control OperationOpen and Closed Loop OperationInput SensorsOutput Devices 本次课学习目标 掌握automotive computer的英文专业词汇 训练快速阅读能力，提高阅读速度 NEW WORDS Computers on Modern Vehicles Almost every vehicle built in the last 10-15 years has at least one on-board computer. There may be up to six different computers on some vehicles. On-board computers control ignition and fuel systems, emission controls, cooling fans, air conditioner compressor, torque converter clutch, and transmission shift points. Other vehicle computers control the air bags, anti-lock brake and traction control systems, interior air temperature and distribution, suspension and steering systems, and the anti-theft system. Many modern vehicles combine the engine contro1 computer and other vehicle computers into one large microprocessor, which monitors and controls most vehicle functions. A few ECUs are made in two parts, with the processor located in the passenger compartment and the output part under the hood. Whatever their physical locations, all ECUs contain two main sections: the central processing unit and the memory section. The memory section has two separate sections of memory--permanent and temporary. Central Processing Unit The central processing unit (CPU) is the section of the electronic control unit that performs calculations and makes decisions. The CPU is sometimes called the controller. The CPU is constructed using one or more integrated circuits, or ICs. Incoming data from the input sensors must go through the CPU, where the data is processed and adjustments made to the output sensors. The ECU must be replaced if the CPU is defective, as it is affixed to the ECUs circuit board. Permanent Computer Memory There are four basic types of permanent compu