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Development of an e-LSD Control Strategy Considering the Evolution of the Friction Torque with the Wear Depth

SAE International Journal of Engines

Meccanica 42-Claudio Annicchiarico
Universita degli Studi di Firenze-Amedeo Tesi, Francesco Vinattieri, Renzo Capitani
  • Journal Article
  • 2016-01-1136
Published 2016-04-05 by SAE International in United States
The Electro actuated Limited Slip Differential (e-LSD) can help increasing the dynamic features of the vehicle, but to implement a well designed control logic it is necessary a deep knowledge of the actual friction torque built up by the differential clutch. This work presents the development of such a control law that takes into account the wear depth progression. To carry out this task, an alternative method has been used to study the clutch discs engagement depending on the wear rate.The method takes advantages from a mixed approach with a numerical and an experimental part. Using a general purpose block-on-ring test bench, the tribologic analyses were performed following the ASTM G77 standard; thus, the friction coefficient has been investigated in the contact between discs with molybdenum treatment and steel alloy discs, as well as its variation depending on the wear rate. The results were input in a numerical algorithm aimed at evaluating the friction torque of the clutch as a function of the pressure and the wear depth. The results, besides providing useful hints for…
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Target setting and structural design of an EPS-in-the-Loop test bench for steering feeling simulation

Danisi Engineering S.r.l.-Tim Wright, Giacomo Danisi
Meccanica 42 S.r.l.-Claudio Annicchiarico
Published 2016-04-05 by SAE International in United States
The adoption of Electrical Power Steering (EPS) systems has greatly opened up the possibilities to control the steering wheel torque, which is a critical parameter in the subjective and objective evaluation of a new vehicle. Therefore, the tuning of the EPS controller is not only becoming increasing complicated, containing dozens of parameters and maps, but it is crucial in defining the basic DNA of the steering feeling characteristics. The largely subjective nature of the steering feeling assessment means that EPS tuning consists primarily of subjective tests on running prototypes. On account of that, this paper presents an alternative test bench for steering feeling simulation and evaluation. It combines a static driving simulator with a physical EPS assisted steering rack. The end goal is to more accurately reproduce the tactile feedback to the driver by including a physical hardware in lieu of complicated and difficult to obtain software models. The focus of the activity in this paper was to define the specifications for this test bench and to entirely design it.The test bench contains some actuators…
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