Volvo develops KERS, a dynamic energy recovery system for flywheels, which will be equipped with a production model


A few days ago, Volvo announced that it will conduct an independent KERS system R&D test with the aim of developing the KERS system into mass production vehicles. Volvo said that KERS can be seen as a lightweight and relatively inexpensive hybrid system that can make a 4-cylinder car with the same power as a 6-cylinder car, while reducing emissions by about 20%.

The KERS (dynamic energy recovery system) technology has been used in the F1 race for some time. I believe many people are familiar with it and Porsche has successfully installed it on the 911 GT3 R Hybrid.

The Volvo KERS system designed by Volvo is installed on the rear axle of the vehicle and is responsible for driving the rear wheels. When the driver brakes, the energy generated by the brake will cause the flywheel to move at a rate of 6,000 revolutions per minute, and when the vehicle is restarted, the system converts the kinetic energy of the flywheel to the rear axle to help drive the vehicle. In addition, once the KERS system is started, the gasoline engine responsible for driving the front wheels will stop working because the energy stored in the KERS system is sufficient for the car to start accelerating again, and the gasoline engine will not be restarted until its energy is consumed.

The flywheel KERS system can provide an additional 58 kilowatts of power (80 hp) when the energy is fully loaded. Volvo expects that the gasoline engine of the vehicle will be turned off for half the time under normal urban road conditions. One of the characteristics of Volvo's flywheel KERS system is its carbon fiber structure. Its flywheel has a net weight of only 5 kg and a diameter of about 20 cm. Moreover, the environment in which the flywheel is located is hermetically sealed, thus reducing the frictional resistance during movement.

Compared to the traditional hybrid system, the flywheel KERS system does not have expensive battery packs and electronic control modules and the cost is relatively low. If the experiment is successful, Volvo production models equipped with a KERS system will be seen in the next few years.

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