混动汽车的好处英语作文
车库门宽度What is a hybrid elecric vehicle?Broadly speaking,a hybrid electric vehicle has two power sources at least,no matter fossil fuel,nuclear energy,solar energy or electric energy and so on,but in real life,most hybrid cars use the traditional internal combustion engine and electric motor as a power source.
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Why hybrid electric vehicle feel valued by many countries recent years?As we know that,oil is not in resources,a lot of information indicate that if mining speed remain at current level,proved oil reserves could merely use ffty to sixty years,so energy supply becomes a tough question.And also by the reason of more and more serious environmental pollution,hybrid electric vehicles have to be pushed onto the stage of history.
And what is the advantage of hybrid electric vehicles when compared to blade electric vehicles(BEV)or conventional vehicles?The characteristic of the electric motor is,when compared to intemal combustion engine,more quiet,efficiency and cleaner,in the same time,speed torque control features is more flexible.When at low rotate speed,electric motor
has a constant torque,when at high rotate speed,it has a constant power.Hybrid electric vehicles combine electric drive with traditional internal combustion engine drive,give full play to the advantages of both.Meanwhile,it can effect a permanent cure to the problem of blade electric vehicles(BEV)'s weak dynamic performance and short cruising distance.In summary,as a appropriate transitional product,hybrid electric vehicle is a good choice in this time that energy crises are getting more and more remarkable and the development of new energy automobile is still in a primary.
Compare to conventional vehicle,HEV can save fuel for the following reasons.奔驰跑车价格
(One)HEV can store part of the vehicle's kinetic energy in battery while braking or downslope in which otherwise is burnt in the brake drums in the form of heat in conventional vehicle.
(Two)The ICE in an HEV can be designed with a smaller displacement without compromising the performance of vehicle.挑战者4
(Three)HEV can make ICE operate at maximum efficiency point or optimal operating line by regulating the output power of battery to satisfy the required power of vehicle.
湖北车牌号(Four)HEV is a multiple energy system;the main issue of HEV is how to optimize the power flow to obtain best fuel economy or low emission at lower cost,which is often referred to as the energy management(EM)problem.The issue will be discussed in next section in detail.
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HEVs have many advantages,however,PEV is not widely used currntly.Expensive price keeps people from it.But we can believe that with the technology developing,the cost of HEV will be much lower,and the reliaility will be more better by that moment,HEVs will become mainstream of automobile market,and be loved by people.