Today, body vibration energy of passenger cars gets dissipated by linear working shock absorbers. A new approach substitutes the damper of a passenger car by a cardanic gimbaled flywheel mass. The constructive design leads to a rotary damper in which the vertical movement of the wheel carrier leads to revolution of the rotational axis of the flywheel. In this arrangement, the occurring precession moments are used to control damping moments and to store vibration energy. A gyroscope is set to high speed revolutions by an electric motor and a gimbal is used for bearing. The gimbal consists of an outer ring which is connected to the vertical movement of the wheel carrier. Right-angled to the outer ring, there is an inner ring pivoting the gyroscope right-angled. In order to avoid undesirable body movements, the directional vector of the angular velocity of the gyroscope is parallel to the car’s yaw axis. Two brushless DC motors are used to rotate both the gyroscopic inertia and the inner ring. Different damper characteristics are achieved by different velocities of the inner ring. From almost zero torque output to high torque output, this damper has a huge spread. With this kinetic energy storage recuperated damping energy stays in the damping system and does not stress the cars electrical system. Next to the basic principal, in this paper an integration in the chassis, including a constructive proposal is shown. A conflict with high torque and high angular velocity leads to a special design. Moreover concepts to deal with all vehicle situations like yawing, rolling and pitching are shown. Since the gyroscope acts in global world coordinate system the movement of the vehicle has to be considered. This leads to a special control of all for systems together regarding different sense of rotation.
Damping A Passenger Car With A Gyroscopic Damper System
SAE 2015 World Congress & Exhibition
SAE Int. J. Passeng. Cars - Mech. Syst. 8(2):2015
Detroit, Michigan, USA
April 23rd 2015