Systems and Control > Control algorithms for semi-active suspensions in two wheel vehicles (Project developed in collaboration with Piaggio group S.P.A.)

Project abstract

The project developed control algorithms for semi-active suspensions in two-wheel vehicles. A semi-active suspension is characterized by the possibility to vary quickly (through an electronic control) the coefficient of damping of the shock-absorber. This technology allows to improve significantly the suspension performance, with respect to traditional suspension: under the same conditions of safety, it allows to have more comfort (or vice versa). The semi-active technology has been already introduced in cars. This project introduced this technology both on two wheel vehicles sport motorcycles with high performances , and on maxi-scooters.
The project is closed.

Example of a modern hig-performance motorbike, equipped (prototype only) with semi-active suspensions

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Project results

On the high performances street motorcycle an algorithm has been developed to optimize, on the base of signals coming from accelerometers and elongation sensors, the behaviour of the front suspension, when the scooter is breaking, and of the rear suspension (mono-shock-absorber), when the vehicle is accelerating.
It has been also developed an algorithm that allows to minimize the shock received from the driver, when he drives over an obstacle, while guaranteeing a very rigid calibration of the suspension in normal conditions.
It has been also developed a methodology of the analysis of the performance of the suspensions for maxi-scooter, through the definition of a test protocol and of the treatment and analysis of experimental data.

Scientific publications:
  • Savaresi S.M., E. Silani, S. Bittanti (2005). Acceleration-driven-damper (ADD): an optimal control algorithm for comfort-oriented semi-active suspensions. ASME Transactions: Journal of Dynamic Systems, Measurement and Control, vol.127, n.2, pp.218-229.
  • Savaresi S.M., E. Silani (2004). On the optimal predictive control algorithm for comfort-oriented semi-active suspensions. 2004 SAE Automotive Dynamics & Stability Conference, Detroit, MI, pp. 183-190 (ISBN: 0-7680-1477-8).