新编汽车专业英语第3版黄汽驰电子课件Unit8PassageB.pptxVIP

Unit Eight　 Hybrid Electric Vehicles;Passage BTypes of Electric Hybrid Vehicles (Ⅱ);But it has no assistance from the electric motor and the regenerative braking feature． Its efficiency of fuel saving is only 5% to 8%． Mild hybrid A mild hybrid car is equipped with an electric motor which is used to assist the engine to propel the car． The electric motor is not powerful enough to make the car move, so the mild hybrid is limited to parallel mode． ;The mild hybrid can allow the engine to turn off automatically when coasting and braking． The mild hybrid can also make use of the regenerative braking and a start-stop system． But it has no all-electric range． Its efficiency of fuel saving is about 10% to 15%． Full hybrid A full hybrid car, also called a strong hybrid, has a feature that it can automatically choose to operate all-electric mode, in series mode, or parallel mode． ; At low speeds where energy usage is minimal, the full hybrid car uses the battery pack and electric motor to operate effectively in all-electric mode without emissions． Its all-electric range is about 2 or 3km long． When the engine, generator and battery work together to supply right amount of electric power to the electric motor, or the engine and the generator charge the battery pack, it operates in series mode． ;When accelerating and climbing, it operates in parallel mode because the engine and the electric motor propel the car together． The efficiency of fuel saving of a full hybrid car gets to about 30% or more． Plug-in hybrid A plug-in hybrid, also called plug-in hybrid electric vehicle (PHEV), has a large battery pack that can be recharged directly from household electricity or a charging pile in public place by plugging into an electric outlet (see Fig.8-5) ．; ;PHEV as an all-electric vehicle is ideal for short trip about 60 km long, and can reduce tailpipe emissions to near zero when running on battery power． PHEV also use the engine and the motor to work together as a hybrid ve