[英语学习]U4 Motor Vehicles.ppt
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1、1,Unit 4 Motor Vehicles,机动车,2,CONTENT,Background Information Reading AExercises of Reading AReading BSimulated Writing Commercial InvoiceListening&Speaking Packing and Shipment,3,Background Information,Motor Vehicle,A motor vehicle or road vehicle is a self-propelled wheeled vehicle that does not op
2、erate on rails,such as trains or trolleys.The vehicle propulsion is provided by an engine or motor,usually by an internal combustion engine,or an electric motor,or some combination of the two,such as hybrid electric vehicles and plug-in hybrids.,4,For legal purposes motor vehicles are often identifi
3、ed within a number of vehicle classes including automobiles or cars,buses,motorcycles,motorized bicycles,off highway vehicles,light trucks or light duty trucks,and trucks or lorries.These classifications vary according to the legal codes of each country.,5,As of 2010 there were more than one billion
4、 motor vehicles in use in the world excluding off-road vehicles and heavy construction equipment.Global vehicle ownership per capita in 2010 was 148 vehicles in operation per 1000 people.The United States has the largest fleet of motor vehicles in the world,with 239.8 million by 2010.Vehicle ownersh
5、ip per capita in the U.S.is also the highest in the world with 769 vehicles in operation per 1000 people.,6,7,The United States has the worlds largest motor vehicle registered fleet,with almost 250 million vehicles,The Peoples Republic of China has the second largest fleet in the world,with slightly
6、 more than 78 million vehicles and since 2009 became the worlds largest new car market.In 2011,a total of 80 million cars and commercial vehicles were built,led by China,with 18.4 million motor vehicles manufactured.,8,9,The Peoples Republic of China became the worlds largest new car market in 2009,
7、An electric bus is a bus powered by electricity.There are two main electric bus categories:Non-autonomous electric buses:The trolleybus is a type of electric bus powered by two overhead electric wires,with electricity being drawn from one wire and returned via the other wire,using two roof-mounted t
8、rolley poles.,10,Electric Bus,The gapbus is a bus without rails or surface power lines,and it can share the road lane with other vehicles as well.Power is supplied over a gap of 12 cm(4.7 in)from a power line embedded in the ground.The onboard stored-electricity bus(autonomous electric buses):Batter
9、y electric bus and capabusGyrobus,11,12,Background Info.-Battery Electric Bus,13,A battery-electric minibus in St Helens,England,14,15,The battery electric vehicle,or BEV,is a type of electric vehicle(EV)that uses chemical energy stored in rechargeable battery packs(电池组).As with other electric vehic
10、les,BEVs use electric motors(电动机)and motor controllers(电动机控制器)instead of internal combustion engines(ICEs内燃机)for propulsion(推动、推动力).,16,All-electric and hybrid electric vehicles 混合动力电动车,Vehicles using both electric motors and ICEs are examples of hybrid electric vehicles,and are not considered pure(
11、or all)EVs because they operate in a charge-sustaining mode(电量保持模式).,17,Reading Material,Read the news and then tell us your opinion towards EV(hybrid vehicle),18,Reading AThe Battery Bus,19,Reading A The Battery Bus,To the everyday bus operator,battery electric power could seem to offer few specifi
12、c advantages over the conventional diesel power.Specific objections are invariably ones of short range,low performance and higher primary energy consumption.Advantages are often mooted ones of low emission and therefore low pollution in urban environs,low noise pollution,greater passenger comfort an
13、d consumption of“off peak”surplus electrical energy.,?,Primary Energy,T/F,20,The ideal battery for electric buses should be able to offer:(a)high energy density;(b)high power density;(c)high electrochemical efficiency;(d)long service life and low maintenance requirements;(e)economical energy costs;(
14、f)safety to operate and service;(g)no temperature control problems in the battery(e.g.overheating or high running temperature).,?,21,Unfortunately,no battery system presently in commercial production can offer all of these facilities.Clearly the electric bus is,in the short term,a practical proposit
15、ion only in the“in-city”role;longer rural or inter-city operation is out of the question now and is likely to be for a very long time to come.,T/F,22,One specific barrier to wider adoption of the electric bus must be the external demand of operators for“unlimited”mileage that is,for vehicles(e.g.die
16、sel engines)with total flexibility.However,there is little to support the view that in a highly efficient transit operation almost every vehicle should be capable of running almost every service.The real truth may be that due to the inflexibility of infrastructure,coupled to the low reliability of p
17、resent technology of diesel buses in almost all existing high-density public transport operation,?,23,a vehicle of high route availability is needed to simply maintain day-to-day service requirements at an adequate level.In this light,may the time has come to take a careful look at the“real”economic
18、s of that highly complicated engineering package the diesel bus.Simplicity usually breeds reliability and viewed in this light electric buses may begin to make sense in operational,financial and engineering terms.,24,The Electric Vehicle Association of Great Britain carried out a comparison between
19、electric and diesel vehicles in the already well-established UK applications of electrical vehicles,primarily milk floats and light vans.From this,the conditions that make electric vehicles viable are:,?,25,(a)the long life of the electric vehicle:fifteen years against five for the conventional vehi
20、cles,which goes offset the higher capital cost of the electric over the conventional vehicle;(b)the tax advantages i.e.no road tax and no tax on fuel;(c)lower maintenance requirement.,Trans,26,One aspect of bus financing could operate in favor of the electric bus.Battery bus purchasers at present re
21、ceive a capital grant from Government.Given a higher capital cost for electric buses,the cash grant payable would be higher for a conventional vehicle.However,this bus grant is rapidly being phased out.,T/F,27,However,there appears to be a good prospect that a battery bus overcoming these present ba
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