How does Regenerative Braking Work How does Regenerative Braking …

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August Electric Vehicle

Learn How Hybrids All-Electric Create Their Own Electricity

and all-electric vehicles create own power for battery recharging a process known as regenerative (regen mode). We’ve what regenerative braking is and how the works in general terms, but folks are interested in the deeper and bolts of electricity generation. understand that in a hybrid or vehicle the word regenerative, in of regenerative braking, means the vehicle’s momentum (kinetic ) and turning it into electricity recharges (regenerates) the onboard as the vehicle is slowing down stopping. It is this charged that in turn powers the electric traction motor.

In an vehicle, this motor is the source of locomotion. In a hybrid, the works in partnership with an combustion engine. But that is not just a source of propulsion, also a generator.

Any permanent magnet motor can as either a motor or generator. In and hybrids, they are more called a motor/generator (M/G). But the curious want to know and they’ll often ask How, and by mechanism or process, is the electricity It’s a good question, so we get started explaining how M/Gs and braking work in hybrids and vehicles, it is important to have knowledge about how electricity is and how a motor/generator functions.

Take a to read How Motors and Generators and then come back for the on the regenerative braking process.

So How Does a Motor/Generator Work in an or Hybrid Vehicle?

No matter the design, there must be a connection between the M/G and the drivetrain. In an vehicle there could be an M/G at each wheel or a central M/G to the drivetrain through a gearbox. In a the motor/generator could be an individual that is driven by an accessory from the engine (much an alternator on a conventional vehicle—this is how the GM BAS works), it could be a pancake M/G is bolted between the engine and (this is the most common Prius, for example), or it could be M/Gs mounted inside the (this is how the two-modes work ). In any the M/G has to be able to propel the vehicle as as be driven by the vehicle in regen

Propelling the Vehicle with the M/G

if not all, hybrids and electrics use an throttle control system. the throttle pedal is pushed, a is sent to the onboard computer, further activates a relay in the that will send current through an inverter/converter to the M/G the vehicle to move. The harder the is pushed, the more current under direction of a variable controller and the faster the vehicle In a hybrid, depending upon battery state-of-charge and the design of the drivetrain, a heavy throttle also activate the internal engine (ICE) for more

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Conversely, lifting slightly on the will decrease current to the motor and the vehicle will down. Lifting further or off the throttle will cause the to switch direction—moving the M/G from mode to generator mode—and the regenerative braking process.

Braking: Slowing the Vehicle and Electricity

This is really the regen mode is all about. the electronic throttle closed and the still moving, all of its kinetic can be captured to both slow the and recharge its battery. As the onboard signals the battery to stop electricity (via the controller and start receiving it (through a controller), the M/G simultaneously stops electricity for powering the vehicle and sending current back to the for charging.

Remember from our discussion on and motor/generator action. when an M/G is with electricity it makes power, when it’s with mechanical power, it electricity. But how does generating slow the vehicle? Friction.

the enemy of motion. The armature of the M/G is by the force of inducing current in the as it passes over the opposing in the magnets in the stator (it’s battling the push/pull of the opposing It is this magnetic friction slowly saps the vehicle’s energy and helps scrub off

August Electric Vehicle
August Electric Vehicle
August Electric Vehicle

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