Control strategy for electromechanical active roll stabilization

Abstract

As a part of the chassis, electromechanical active roll stabilization systems increase the spread between driving dynamics and driving comfort. There are several distinct advantages compared to the passive versions: improved driving comfort, increased lateral tire force and adjusted self-steering behavior.

Functional upgrading results from the interaction of mechatronic components: actuators, sensors and information processing. Using system control as a functional key component within information processing plays a decisive role in this process.

Numerous conflicting goals represent a challenge regarding system development. On the one hand due to the high demand on the dynamics of the set forces in the chassis; on the other hand, because of the typical automotive requirements such as limited power resources, a high operating temperature and the sensitive acoustics.

The following paper provides an insight into the system function of the electromechanical active roll stabilization employed in different D-segment vehicles of the Porsche AG.

Special focus is placed on the description of a modular-hierarchical structured control strategy as it has already proven its value despite the above-mentioned conflicting goals. The control structure primarily consists of three core elements: the sensor data fusion of external disturbance variables including an internal preview, the modal transformation of the disturbance excitation into axle specific variables as well as a model based subordinate actuator control.