The IndyCar ERS integrates with the existing 2.2-liter, twin-turbocharged V6 engine, adding up to 60hp. Positioned within the bell housing area between the engine and transmission, the compact hybrid unit fits within the current chassis and engine footprint.
Key components of the ERS system
The energy storage system (ESS) consists of 20 supercapacitors designed by Skeleton. These swiftly capture and deploy energy, enhancing responsiveness compared with traditional batteries.
The motor generator unit (MGU), named EMPEL 180 and developed in collaboration with high-performance motor racing engineering company Ilmor, converts kinetic energy produced during braking into electrical energy stored by the ESS. Linked to the driveshaft of the IndyCar engine, the MGU supplements engine power when deployed.
The DC-DC converter from BrightLoop ensures that energy from the ESS or generated by the MGU is output at the correct voltage for the existing powertrain.
The voltage control device acts as a safety mechanism, preventing the system from exceeding 60V.
Operational functionality
During racing, the ERS captures and stores energy typically lost during braking (regenerative braking). This energy is stored in the ESS and can be deployed by the driver to provide additional power, aiding in overtaking maneuvers or acceleration bursts.
Drivers can control the regen process manually via steering wheel controls, adjusting the rate of energy harvesting according to race conditions. The system also supports automatic regeneration settings managed by onboard software.
The ERS not only enhances performance but also improves race-day safety by enabling the car to restart independently in the event of a stall, reducing the need for external assistance and minimizing race interruptions.
The ERS adds approximately 42.5kg to the car’s weight according to Indy, offset by other weight-saving measures within the chassis.
It can be charged via a 12V source in the pit lane or by the engine itself during idle periods.
Currently generating 60 additional horsepower and 45Nm of torque, the system has potential for further development. With a maximum operating voltage of 60V and the capability to fully charge or discharge in approximately 4.5 seconds, the ESS supports dynamic on-track performance.