(Redirected from Hybrid cars)
A 'hybrid vehicle' (HV) is a vehicle that uses two or more distinct power sources to propel the vehical such as:
★ An on-board
rechargeable energy storage system (RESS) and a fueled power source (
internal combustion engine) for vehicle
propulsion
★ Human or sail powered bicycle with battery assist
★ A human-powered or
sail boat with electric power
The term most commonly refers to
Hybrid-electric vehicle (HEV) which includes
internal combustion engines and
electric motors (generally powered by
electric batteries or other
rechargeable energy storage system -RESS-). See also "
Hybrid Vehicle Drivetrains" and
"List of hybrid vehicles".
History
One of the earliest hybrid vehicles were simply boats with both sails and oars, such as the
Greek/Phoenician trireme warships. These used a sail for traveling with the wind, and the oars for when there was insufficient wind, or in circumstances that the sail was unfavorable (such as naval combat, in the case of the triremes).
Hybrid types by vehicle
Two-wheeled and cycle-type vehicles
Mopeds and
electric bicycles are a simple form of a hybrid, as power is delivered both via an
internal combustion engine or
electric motor and the rider's muscles.
★ In a 'parallel hybrid bicycle' human and motor power are mechanically coupled at the pedal drive train or at the rear or the front wheel, e.g. using a hub motor, a roller pressing onto a tire, or a connection to a wheel using a transmission element. Human and motor torques are added together. Almost all manufactured models are of this type. See
Motorized bicycles,
Mopeds and
[1] for more information.
★ In a 'series hybrid bicycle' (SH) the user powers a generator using the pedals. This is converted into electricity and can be fed directly to the motor giving a
chainless bicycle but also to charge a battery. The motor draws power from the battery and must be able to deliver the full mechanical torque required because none is available from the pedals. SH bicycles are not yet commercially available. They will become feasible if extremely high-efficiency generators and motors are available at competitive prices, especially for recumbent bicycles and tandems, where problems associated with the complexity of a long chain drive can be avoided.
[2].
::The first known prototype and publication of a SH bicycle is by Augustus Kinzel (US Patent 3'884'317) in 1975. In 1994 Bernie Macdonalds conceived the
Electrilite SH lightweight vehicle which used power electronics allowing regenerative braking and pedaling while stationary. In 1995 Thomas Müller designed a "Fahrrad mit elektromagnetischem Antrieb" in his 1995 diploma thesis and built a functional vehicle. In 1996 Jürg Blatter and Andreas Fuchs of Berne University of Applied Sciences built a SH bicycle and in 1998 mounted the system onto a
Leitra tricycle (European patent EP 1165188). In 1999 Harald Kutzke described his concept of the "active bicycle": the aim is to approach the ideal bicycle weighing nothing and having no drag by electronic compensation. Until 2005 Fuchs and colleagues built several prototype SH
tricycles and
quadricycles.
[1]
Heavy vehicles
Hybrid
power trains are used for
diesel-electric or
turbo-electric railway locomotives, buses, heavy goods vehicles, mobile
hydraulic machinery, and ships. Some form of heat engine drives an electric generator or hydraulic pump which power one or several electric or hydraulic motors. There are advantages in distributing power through wires or pipes rather than mechanical elements especially when multiple drives - e.g. driven wheels or propellers - are required. There are disadvantages due to the power lost in the double conversion. With large vehicles the advantages often outweigh especially as the relative conversion losses decrease with size. Generally there is no or relatively little energy storage capacity, e.g. auxiliary and emergency batteries and
hydraulic accumulators.
Hybrid types by engines
Hybrid-electric petroleum vehicles
Main articles: Hybrid electric vehicle
When the term ''hybrid vehicle'' is used, it most often refers to a
Hybrid electric vehicle. These encompass such vehicles as the
Toyota Prius,
Toyota Camry Hybrid,
Ford Escape Hybrid,
Honda Insight and others. A petroleum-electric hybrid most commonly uses
internal combustion engines (generally gasoline or
Diesel engines, powered by a variety of fuels) and
electric batteries to power
electric motors. There are many
types of petroleum-electric hybrid drivetrains from 'Full hybrid' to
Mild hybrid which offer varying advantages and disadvantages
[3].
===Continuously Recharged
Battery Electric Vehicle (BEV)===
Given suitable infrastructure, BEVs can be recharged while the user drives. The
BEV establishes contact with an electrified rail, plate or overhead wires on the highway via an attached conducting wheel or other similar mechanism (see
Conduit current collection). The BEV's batteries are recharged by this process - on the highway - and can then be used normally on other roads.
This provides the advantage of virtually unrestricted highway range. Since most destinations are within 100 km of a major highway, this reduces the need for expensive battery systems.
The technology for such infrastructure is old and well established - (see
Conduit current collection,
trams,
electric rail,
trolleys,
third rail). Electricity and infrastructure costs can be funded by toll revenue, gasoline taxes or other sources.
Hybrid fuel (dual mode)
In addition to vehicles that use two or more different devices for
propulsion, some also consider vehicles that use distinct energy input types ("
fuels") using the same tank and engine to be hybrids, although to avoid confusion with hybrids as described above and to use correctly the terms, these are described as
dual mode vehicles:
★ Some
electric trolleybuses can switch between an on board
diesel engine and overhead electrical power depending on conditions (see
dual mode bus). In principle, this could be combined with a battery subsystem to create a true plug-in hybrid trolleybus, although
as of 2006, no such design seems to have been announced.
★
Flexible-fuel vehicles can use a mixture of input fuels (petroleum and
biofuels) in one tank — typically
gasoline and
bioethanol or
biobutanol, though diesel-
biodiesel vehicles would also qualify.
Liquified petroleum gas and
natural gas are very different from each other and cannot be used in the same tanks, so it would be impossible to build an (LPG-NG) flexible fuel system.
★ Some vehicles have been modified to use another fuel source if it is available, such as cars modified to run on
autogas (LPG) and diesels modified to run on
waste vegetable oil that has not been processed into bio-diesel.
★ Power-assist mechanisms for
bicycles and other
human-powered vehicles are also included.
★ A
Plug-in hybrid electric vehicles (PHEV) is an emerging type of automobile which can use traditional liquid combustibles and electricity as fuels. Such vehicles could reduce fossil fuel consumption, pollution, and operating costs. If equipped with
vehicle to grid technology they could also help stabilize the
electric grid by acting as load balance devices. By reducing the amount of liquid fuel required they could also help
biofuels meet a larger portion of our fuel demands.
See also
References
1. Das Powerbike (German), ISBN 3895951234
2. Velomobile Seminar 1999, ISBN 3-9520694-1-8
3. Fuel Saving Calculator
External links
★
Yahoo Hybrid Cars
★
Hybrid Cars History.
★
2007 Hybrid Cars
News
★
Man Motors On Hybrid Bicycle video - Sept 2006
★
NYC Mayor Michael Bloomberg: NYC Taxi Fleet to be Fully Hybrid by 2010 May 22, 2007
Hybrid airplanes
★
World's First Hybrid Airplane Engine.
★
The Future of Flight (Obese Pelicans to Shape-Shifting Switchblades)
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