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What is a hybrid electric vehicle |
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发布时间：2010-06-29 文章来源：1 点击：1486 |
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Hybrid electric vehicle is to install an internal combustion engine vehicles, which aims to reduce vehicle pollution, improve the mileage of pure electric vehicles. Hybrid electric vehicle with two tandem and parallel structure.
Hybrid car (also known as hybrid electric vehicle) is on board with two or more power sources, including motor drive, meet the vehicle road traffic, vehicle safety regulations.
Classification
Hybrid cars are mainly three kinds of species present. A kind of power is the main engine, the electric motor as a secondary
Principles of Series Hybrid Electric Vehicle
Help power "in parallel." That approach to engine-driven traffic, use of electric motors possess a strong re-start momentum generated character in auto start, acceleration and other engine fuel consumption of the time, electric Motor-assisted Fadong Ji-driven approach to reduce the fuel consumption. This approach is relatively simple structure, only an increase in the car on electric motors and batteries. Another is that in the low speed electric motor driving alone, when the speed of the engine and electric motor driven matching "series, in parallel." Startup and low-speed electric motor alone when traveling, when the speed increases, the co-efficient engine and electric motor power sharing, power sharing in this way requires equipment and generators, the complex structure. There is only one kind of electric motor driving the electric car "in series", the engine only as a power source, electric motor-driven vehicle traveling alone, only electric motor drive system, but because the same need to install a fuel engine, it is also a hybrid a car.
Superiority
Car has a variety of power sources: batteries, fuel cells, solar cells, diesel generator set, the current hybrid vehicles generally refers to diesel generators, plus a car battery.
Specific Categories
Hybrid-electric vehicles in accordance with the synthetic form of energy is divided into tandem (SHEV) and parallel (PHEV) are two.
Series power from the engine, generator and electric motor powertrain composed of three parts, between them the way with a series composed of SHEV the power unit system. Load hours and battery-powered electric motor drive the wheels turning, the load is large engine driven generator driven by the motor. When the electric vehicle office, such as start, acceleration, climbing the condition, the engine - motor group common to the electric motor and batteries to provide power; when the low-speed electric vehicles office, taxi, idle when the working conditions, from battery-driven motor, by the engine - generator to charge the battery pack. This series electric car whatever the condition, ultimately from the motor to drive the wheels. Such as Ford, "a new level -2010" SHEV, its battery with fuel cell, when driving in urban areas, all driven by the fuel cell electric motors, electric motor through reducer (gearbox) and axle-driven wheels, reach a "zero discharge" requirements . When the speed and climbing, the case engine - motor group and the fuel cell power supply common to the motor, drive the wheels.
Parallel device engines and electric motors to drive mechanical car stacking manner, the engine and motor belonging to the two systems can be separately provided to the auto transmission torque, the different roads and can only be driven by separate drive. Motor can be used both for generating electric motor and can use, also known as Electric - generator. In the absence of a separate generator, the engine can drive the wheels directly through the transmission, so the device closer to the conventional drive system, will be more widely applied. For example, Volkswagen s Golf PHEV, electric motor driven through the clutch 1 - generator, the output torque and then through the other side of the clutch 2 drives traffic. Stationary start, the battery to power - generating electricity, then power - is the engine starter generator. Engine starts, the engine on the one hand as a separate power source for vehicles, drive the wheels, on the other drive power - generating electricity to charge the battery, this time as with conventional cars. In urban driving, the engine shut down, disengage the clutch 1, clutch 2 bonding, the battery as the only energy supply to the motor, replace the engine by the motor drive the wheels. When electric cars need high-speed or high load, the engine start clutch a close, the engine and the electric - driven generator system composed of complex forms, to the maximum power-driven vehicles.
Hybrid vehicles in developed countries has become more sophisticated, some have entered the practical stage. As the structural complexity, high cost, in the era before the arrival of electric cars, hybrid cars is only a transitional product.
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