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So, kinetic energy is harvested from the rear wheels under engine braking. There is the KERS shaft connected to the main drive shaft which transmits this energy from the wheels, through shear physical torque to the Motor Generator Unit (which is now working as a generator) which then charges up the battery. When released it simply works in reverse – energy from the battery drives the MGU which is now working as a motor which transmits the energy through the KERS shaft to the drive shaft and to the wheels.
Can anyone explain how power stored by Kers is used to boost the engine when released?