“Twizy Renault Sport F1 is much more than eye catching concept car. In addition to its spectacular look, it delivers genuine high performance thanks to its Kinetic Energy Recovery System (KERS) which is identical to the solution used by Renault-powered Formula 1 race cars. The system instantly boosts power output six-fold to reach almost 100 horsepower and is capable of catapulting the car from standstill to 100kph as quickly as Renault’s highest-performing road car, Mégane R.S. This technological gem is the fruit of close collaboration between engineers at Renault Sport Technologies and their colleagues at Renault Sport F1.
Twizy Renault Sport F1′s performance credentials are founded on the use of the KERS employed by Renault-powered Formula 1 cars.
The KERS (Kinetic Energy Recovery System) is designed to recover some of the kinetic energy which is generated under braking. Instead of being lost in the form of heat, this energy is recovered and stored before being used to momentarily boost power output, just as it is in Formula 1.
The KERS comprises three main elements:
•An electric motor-generator unit (MGÚ) directly linked to the driveshaft.
•Specific lithium-ion batteries.
•A KERS Control Únit (KCÚ
As its name implies the motor-generator unit serves as both a generator and a motor. In ‘generator’ mode, it functions like a dynamo to convert mechanical energy into electrical energy which is then stored in a battery. To use this energy, it suffices to reverse the process. The system then switches to the ‘motor’ mode to use this stored energy to deliver a power boost to the wheels via the motor.
Twizy Renault Sport F1 is consequently equipped wîth two electric motors, i.e. Twizy 80′s original motor (17hp/13kW) onto which an F1-style KERS has been grafted to turn the concept car into a genuine pocket rocket wîth exceptional performance credentials.
When the KERS is activated, Twizy Renault Sport F1′s power output climbs instantly by a factor of six, from 17 to 97 horsepower (72kW). This boost is available for approximately 14 seconds, just as it is in the case of a Formula 1 car. Thanks to this additional power, the concept car is capable of accelerating from standstill to 100kph in the same time as Mégane R.S.
When the system is triggered, the maximum revs of Twizy’s motor rise to 10,000rpm for a top speed of 110kph. The fruit of advanced technology, the MGÚ-K fits inside a 10cm-diameter cylinder and can rev to as high as 36,000rpm. The KERS is equipped wîth its own battery capable of very short charge/discharge cycles. Derived directly from F1 technology, the package weighs barely 30kg, battery included.”
Renault Twizy RS-F1 source