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Hybrid vehicles are vehicles with two or more power sources in the powertrain. There are many different types of hybrid vehicles, although only the gasoline-electric hybrid is currently commercially available. Hybrids are classified by the division of power between sources; both sources may operate in parallel to simultaneously provide acceleration, or they may operate in series with one source exclusively providing the acceleration and the second being used to augment the first's power reserve. The sources can also be used in both series and parallel as needed, the vehicle being primarily driven by one source but the second capable of providing direct additional acceleration if required. Current hybrids use both an internal combustion engine (ICE) and a battery/electric drive system (using ultracapacitors) to improve fuel consumption, emission, and performance. Electrically assisted pedal bicycles are a form of hybrid drive. Other combinations of energy storage and conversion are possible, although not yet in commercial production. Combustion-electric hybrids have larger battery sets than what a normal combustion engine only vehicle would have. Battery and supercapacitor technology is advancing.〔(【引用サイトリンク】title=DOE to Award Up to $2.4B for Advanced Batteries, Electric Drive Components, and Electric Drive Vehicle Demonstration/Deployment Projects )〕 A potential advantage is that when these battery sets require renewing in the future, the newer battery sets will be potentially superior having higher energy storage giving greater range enhancing a vehicle. ==Types by drive train structure== ====== Parallel hybrid systems, which are most commonly produced at present, have both an internal combustion engine (ICE) and an electric motor coupled. If they are joined at an axis in parallel, the speeds at this axis must be identical and the supplied torques add together. Most electric bicycles are of this type. When only one of the two sources is being used, the other must either also rotate in an idling manner, be connected by a one-way clutch, or freewheel. With cars, the two sources may be applied to the same shaft- for example with the electric motor lying between the engine and transmission. The speeds are thus equal and the torques add up, with the electric motor adding or subtracting torque to the system as necessary. The Honda Insight uses this system. Parallel hybrids can be further categorized depending upon how balanced the different portions are at providing motive power. In some cases, the combustion engine is dominant (the electric motor turns on only when a boost is needed) and vice versa. Others can run with just the electric system operating. But because current parallel hybrids are unable to provide all-electric (ICE=OFF) propulsion, they are often categorized as mild hybrids (see below). Because parallel hybrids can use a smaller battery pack as they rely more on regenerative braking and the internal combustion engine can also act as a generator for supplemental recharging, they are more efficient on urban stop and go conditions or city driving compared to highway driving.〔 Honda's Insight, Civic, and Accord hybrids are examples of production parallel hybrids.〔(【引用サイトリンク】title=Hybrids Under the Hood (Part 2): Drivetrains )〕 General Motors Parallel Hybrid Truck (PHT) and BAS Hybrids such as the Saturn VUE and Aura Greenline and Chevrolet Malibu hybrids are also considered as utilizing a parallel architecture. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「hybrid vehicle drivetrain」の詳細全文を読む スポンサード リンク
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