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Encyclopedia > Regenerative braking

Regenerative braking is any technology which allows a vehicle to recapture and store part of the kinetic energy that would otherwise be 'lost' to heat when braking. A simpler technology that only converts the energy to heat but which uses similar principles is known as dynamic braking. Both are most commonly seen on electric or hybrid vehicles. Braking is accomplished by electrically switching motors to act as generators that convert motion into electricity instead of electricity into motion. Traditional friction-based brakes must also be provided to be used when rapid, powerful braking is required. Estimates currently see 30% efficiency; however, the actual efficiency depends on numerous factors, such as the state of charge of the battery, how many wheels are equipped to use the regenerative braking system, and whether the topology used is parallel or series in nature. Vehicles are non-living means of transport. ... Kinetic energy (also called vis viva, or living force) is energy possessed by a body by virtue of its motion. ... Heat (abbreviated Q, also called heat change) is the transfer of thermal energy between two bodies which are at different temperatures. ... For the type of ferns known as brakes, see brake (fern). ... Heat (abbreviated Q, also called heat change) is the transfer of thermal energy between two bodies which are at different temperatures. ... The article on electrical energy is located elsewhere. ... In biology, hybrid has three meanings. ... Generator redirects here. ... This article is about motion in physics. ...


Electric railway vehicles feed the recaptured energy back into the grid, while road vehicles store it for re-acceleration using flywheels, batteries or capacitors. Older dynamic brake systems generally used the electricity to provide heat or just passed it through large banks of resistors to dissipate the energy. Electricity distribution is the penultimate process in the delivery of electric power, the part between transmission and user purchase from an electricity retailer. ... A flywheel is a heavy rotating disk used as a repository for angular momentum. ... Four double-A batteries In science and technology, a battery is a device that stores energy and makes it available in an electrical form. ... Various types of capacitors A capacitor is a device that stores energy in the electric field created between a pair of conductors on which equal but opposite electric charges have been placed. ... An ideal resistor is a component with an electrical resistance that remains constant regardless of the applied voltage or current flowing through the device. ...


Hydraulic System

This is a patented system currently in development by Permo-Drive, a small Australian company. It is designed to replace the current exhaust braking system on trucks and boasts better efficiency, less noise as well as other benefits over exhaust braking.


The mechanism is attached to the driveshaft of the vehicle and when brakes are applied feeds energy into accumulators and is stored as hydraulic fluid under great pressure. The energy is then released again into the drive shaft when the vehicle is accelerating. This system is claimed to withhold up to 40% of the energy otherwise wasted in braking. A driveshaft or driving shaft is a mechanical device for transferring power from the engine or motor to the point where useful work is applied. ... In a CPU, an accumulator is a register in which intermediate results are stored. ... Hydraulic fluids are a large group of liquids made of many kinds of chemicals. ... Pressure (symbol: p or P) is the measure of the force that acts on a unit area. ...


  Results from FactBites:
 
Electric vehicle control device - Patent 4388573 (4995 words)
The changeover switch is changed over in the regenerative braking state when another power running state in the direction opposite to the current running direction is instructed in a predetermined time after the stop of a power running state where the chopper had a conduction ratio greater than a preset value.
The output terminal of the regenerative brake removing circuit 70 is connected through the diode 73 to the resistor 74 and the capacitor 75.
That is, though the regenerative braking can be conducted at the number n.sub.o of turns in some cases, the above braking cannot be conducted till the number n of turns reaches the value n.sub.1 in the case where the motor current i.sub.M is so controlled as to be made equal to the value i.sub.M1.
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