Unit 15 Cruise Control System 巡航控制系统.ppt

,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Unit 15,Cruise Control System,(CCS,巡航控制系统）,New words&phrases,cruise,kru:z,巡航，漫游,servo,s:v,伺服，伺服系统,resume,rizju:m,恢复,transducer,trnzdju:s,转换器,speedometer,spi:dm,i,t,速度计,cruise control system(CCS),巡航控制系统,Power train control module(PCM),动力传动控制模块,vehicle speed sensor,（,VSS,）车速传感器,adaptive,dptiv,cruise control(ACC),自适应巡航控制,Speed control or auto cruise(drive),（自动驾驶）,车速控制系统,/,恒速控制系统,It is a system that automatically controls the speed of a motor vehicle.,The system takes over the throttle(,节气门）,of the car to maintain,a steady speed,as set by the driver.,(P 138 Para.1),History,历史,1945 Ralph,Teetor,拉尔夫,.,蒂特（盲人发明家）,Born,:1890,Died,:1982,Nationality,:America(Indiana),Occupation,:Engineer,Inventor,He was the longtime president of the automotive parts manufacturer,The Perfect Circle Co,.,，,a manufacturer of,piston rings,（活塞环）,.,The first car with CCS was the,Chrysler,Imperial in,1958,.,美国著名汽车公司，成立于,1922,年，主营高端汽车生产。,1908,：,GM(General Motors Corporation),1903:Ford,1933,年，帝王被誉为当时最美丽的轿车，当年只生产了,11,部,中国产车型：克莱斯勒,300C,（,40-50,万）,Purpose of CCS,作用,CCS is designed to allow the driver to maintain a,constant speed,without having to apply continual foot pressure to the accelerator pedal,（加速踏板）,.,（,P 138,）,定速巡航用于控制汽车的定速行驶，汽车一旦被设定为巡航状态时，发动机的供油量便由电脑控制，电脑会根据道路状况和汽车的行驶阻力不断地调整供油量，使汽车始终保持在所设定的车速行驶，而无需操纵油门。,目前,巡航控制系统,已成为,中高级轿车,的标准装备。,一般情况下，当驾驶着踩下刹车踏板时定速巡航会被自动解除。,这种系统在国外汽车上应用较多，在美国，安装率已达到,60,以上。然而，在我国由于道路条件限制，使用率不高。,Cruise control parts,组成部分,(1),cruise control switch,巡航控制开关,It is used to set or increase speed,resume speed,or turn the system on and off.,巡航控制开关即驾驶员指令开关，也称主控开关，安装在转向柱上，操纵非常方便。大多数巡航控制开关有四个档位：即,ON,（接通）、,SET,ACC,（设置加速）、,COAST,（滑行）和（,Resume,）恢复四组开关。,1-Set(,设定,),；,2-Resume,（恢复）；,3-Accelerate,（加速）；,4-Coast,（滑行,/,减速）,车速设定功能,：当在高速公路上行驶时，路面质量好，没有人流，分道行车，无逆向车流，适宜较长时间的稳定行驶时，可按下“设定”开关，,设定一个稳定行驶的车速，使司机不用再踩节气门和换档，汽车一直以这一车速稳定运行,。,恢复功能,：当司机处理好情况后，根据路面车流情况又可稳定运行时，可按“恢复”功能开关，这样汽车又自动按上述设定的车速稳定均匀运行。若不按“恢复”功能开关，也可在司机认为最有利车速时按“设定”开关，汽车就又自动按新选择的设定车速稳定运行。,滑行功能,：也称为,减速功能,。当按下“滑行”开关时，则汽车在原设定车速基础上减速行驶，开关一直按下不放，则车速一直在减低。当你一放松“滑行”开关，则汽车就自动以你放松“滑行”开关瞬间的车速稳定行驶。,加速功能,：当按下“加速”开关时，则汽车在原设定的车速基础上加速行驶，开关一直按下不放，则车速一直在增加。当你一放松“加速”开关时，则汽车就自动以你放松“加速”开关瞬间的车速稳定行驶。,取消功能,：取消设定的巡航速度将巡航控制系统控制开关手柄置于,CANCEL,方位并释放,(2)transducer,转换器,/,变送器,When the cruise control is on and the transducer is operating,its able to sense the vehicle speed based on the electrical sensors and in turn,control either the vacuum in a servo or the mechanical connection to the throttle.,在接收来自巡航控制开关 和发动机进气歧管真空度等信号后，综合起来对伺服机构的真空度进行调节，达到稳定发动机转速的目的。,(3)Servo,伺服机构,It controls the position of throttle valve,伺服机构的作用就是控制节气门的开度,.,Throttle valve(,节气门）：,it sits between the intake manifold and air intake pipe and,controls airflow into the engine,a crucial factor for controlling the engine air-fuel ratio,是用来控制空气进入引擎的一道可控阀门，进入进气管后和汽油混合成为可燃混合气体，参与燃烧做功。节气门是当今电喷车,发动机,系统最重要的部件，他的上部是空气滤清器，下部是发动机缸体，是,汽车发动机,的咽喉,Throttle valve,is connected to the gas pedal,（油门）,.,It is the valve that regulates how much air enters the engines.The gas pedal is really the air pedal.,油门踏板就是进气踏板,The throttle valve directly controls the volume of air which enters the engine based on driver demand.,进气量由驾驶员通过控制加速踏板操纵节气门来控制，踩油门其实是在控制节气门的开启角度，,It is connected to the throttle by a rod or a cable.,The servo unit positions the throttle to maintain the desired car speed by receiving a controlled amount of vacuum from the transducer.The variation in vacuum changes the position of the throttle.,它用杆件和拉索与节气门相连，通过真空度的变化来保证发动机转速稳定。当真空度增大时，弹簧压缩节气门开度增大转速上升，反之，转速降低。,(4)safety switch,安全开关,brake release switch,vacuum release switch,（,valve,）,Usually,depressing the,brake,or,clutch,pedal,will disable the system so the driver can change the speed without resistance from the system.,释放开关和真空释放开关都装在制动踏板支架上。当踩下制动踏板时，两个安全开关都使巡航控制功能消除，起双重保险作用。,Advantages&disadvantages,优缺点,1,）,equipment for comfort,汽车的舒适性装备，,提高了汽车行驶的稳定性和舒适性,2,）,Usefulness for long drive,especially during a,highway,journey,长途行车，减轻驾驶疲劳,(,尤在郊外或高速公路行驶）,3)better fuel efficiency,节省燃料，具有一定的经济性和环保性（使用巡航控制系统可节省燃料,15%,）,Cruise control can also lead to accidents due to several factors:,few cars:driver may get sleepy,many cars:brakes,车少，司机易走神,车多，刹车多,when used during bad weather or while driving on wet or snow or ice-covered road,the vehicle could go into a skid.,为了让汽车获得最佳控制，当遇到交通阻塞或在雨、冰、雪等湿滑路面上行驶，不要使用巡航控制系统。,Many countries establish that it is,illegal,（非法的）,to drive within city limits with the cruise control feature activated.,ACC,自适应巡航控制,Adaptive cruise control/radar cruise control,Itis an optional,cruise control,system for,road vehicles,that automatically adjusts the vehicle speed to maintain a safe distance from vehicles ahead.,自适应,巡航控制系统,是一种,智能化的,自动控制系统,.,在车辆行驶过程中，安装在车辆前部的车距传感器（雷达）持续扫描车辆前方道路，同时轮速传感器采集车速信号。当与前车之间的距离过小时，,ACC,控制单元,可以通过与制动,防抱死系统,、发动机控制系统协调动作，使车轮适当制动，并使发动机的输出功率下降，以使车辆与前方车辆始终保持安全距离,。,Homework,1.Modern cruise control system was invented in 1958 by the blind inventor and engineer Ralph,Teetor,.(),2.The first car with cruise control system was from Ford Motor Company.(),3.The cruise control switch usually has three pairs of positions:on/off,set/coast,and resume/accelerate.(),4.Cruise control system allows the driver to maintain a constant speed without having to apply continual foot pressure to the accelerator pedal.(),5.Cruise control system is very useful for driving in crowed,cities.(),