车专业英语Unit-9-Passage-A课件

1、Unit Nine Electric Vehicles andNatural Gas Vehicles Passage AElectric VehiclesElectric vehicles only use electricity to make the vehicles move in place of conventional fuels They are propelled by one or more electric motors powered by rechargeable battery packs They are designed to save fossil fuels

2、 such as gasoline and diesel, reduce harmful emissions and get an eco-drivingBattery electric vehicle (BEV)BEV mainly uses a high-voltage electric motor to drive the car The electric motor gets its electric power from a high-voltage battery pack which is recharged by plugging into standard 220-volt

3、outlet BEV is divided into range-extended electric vehicle (RE-EV) and all-electric vehicle (EV).Range-extended electric vehicle (RE-EV) uses an engine as an on-board range extender to increase its all-electric range (AER). The engine and the generator form a fuel-electric generator set The engine i

4、s connected directly to the generator and is used only when needed to generate electricity to automatically charge the battery Its generator delivers enough power to charge battery quickly and efficiently while driving (see Fig.9-1a).All-electric vehicle (EV) has no internal combustion engine (ICE)

5、at all It uses a large battery pack to store the electricity that powers the electric motor to move the car The battery must be recharged by plugging into a power source Some EVs have on-board chargersOthers need to be plugged into an external charger (see Fig.9-1b). An EV is a zero-emission vehicle

6、, and its electric motor produces no tailpipe exhaust emissions.There are many pros and cons about electric vehicles The electric vehicle is known to have faster acceleration in silence but shorter distance range than conventional cars with engine They produce zero emission but require long charging

7、 time What is the long-term solution?Fuel cell electric vehicle (FCEV)FCEV also called FCV (Fuel Cell Vehicle) is considered as the next generation electric vehicle Unlike a conventional car which runs on gasoline, FCEV combines hydrogen and oxygen to produce electricity used to move the car without

8、 emission pollutants and offers quiet cruising just like BEV In addition, its long driving range is comparable to conventional carsUnlike a BEV, FCEV is quickly refueled only for a couple of minutes at the filling station just like conventional cars as shown in Fig.9-2 But it is little affected by t

9、he weatherA typical FCEV is equipped with the following main components as shown in Fig.9-3 below:Hydrogen tank: stores hydrogen gas compressed at extremely high pressure to increase driving range; Fuel cell stack: fuel cell (FC) is nothing more than a battery fueled by hydrogen, and fuel cell stack

10、 converts hydrogen gas and oxygen into electricity to power the electric motor;Electric motor: propels the car much more quietly, smoothly, and efficiently than an internal combustion engine and requires less maintenance;Drive battery: is a high-output battery that stores electricity generated from

11、regenerative braking and provides additional electric power to the electric motor;Power control unit: controls the flow of electricity;Fuel cell boost converter: converts alternate current into direct currentFCEV operates in the following manners: the hydrogen from the tank and oxygen from the air a

12、re pulled into the FC stack When they meet in the FC stack, electricity and water are created through a chemical reaction The electricity is sent to the electric motor to propel the car, and water vapor is emitted from tailpipe without emission pollutants (see Fig.9-4). New Words and Expressionsrech

13、argeable ritdbl adj 可再充电的plug plg vt 插入; 接插头range-extended 增程on-board nb: d adj 车载extender ikstend n 延长器zero-emission ziruimin n (废气) 零排放tailpipe teilpaip n 排气管, 排气尾管hydrogen haidrdn n 氢oxygen ksidn n 氧气affect fekt vt 影响in place of代替rechargeable battery pack可充电蓄电池组New Words and Expressionsfossil fuel化石燃料eco-driving环保驾驶, 绿色驾驶all-electric range纯电动行驶里程pros and cons正反两方面, 有利有弊in silence安静地be comparable to比得上的; 与可比较的be nothing more than只不过是alternate current交流电direct current直流电Common Aut