The Energy Recovery System (ERS) underpins the power unit of the Renault Sport Formula One™ car. The ERS incorporates two motor generator units, the MGU-H and MGU-K, and a battery. 

 

The MGU-K (Motor Generator Unit – Kinetic) converts the kinetic energy dissipated during braking into electricity for a boost equivalent to 120kW or 160 hp, that can be deployed to the rear wheels throughout the lap.

 

The MGU-H (Motor Generator Unit – Heat) converts heat energy from the exhaust gas into electricity that can be stored or used instantly for powerful acceleration until the internal combustion engine is making peak torque—an electric-energy ‘turbo boost’.  

 

MGU-KINETIC: CHARGE

The four phases of energy recovery and deployment

The Motor Generator Unit-Kinetic (MGU-K) is connected to the engine’s crankshaft. The MGU-K recovers kinetic energy used during braking and stores it in the battery.

MGU-HEAT: DISCHARGE

The Motor Generator Unit-Head (MGU-H) directs the energy it converted from heat of the exhaust gases to the Motor Generator Unit-Kinetic (MGU-K) or to the battery. 

 

It also responds to the air requirements of the engine and controls the turbocharger’s speed, slowing it down in place of a wastegate, or speeding it up to compensate for turbo lag.

 

MGU-KINETIC: DISCHARGE

On accelerating, the Motor Generator Unit-Kinetic (MGU-K) then propels the car with a 160 hp power boost, using power from the battery and/or the Motor Generator Unit-Head (MGU-H).

MGU-HEAT: CHARGE

The Motor Generator Unit-Heat (MGU-H), connected to the turbocharger, converts heat from the exhaust gases into electricity and stores in the battery via an inverter.