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INIZIO_TESTO_DA_INDICIZZARE

RESEARCH PROGRAM

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Keywords
MODELLING; DRIVER'S COMFORT; ENGAGEMENT CONTROL; LATERAL DYNAMICS CONTROL; SUSPENSION CONTROL; ACTUATORS; ROBUST CONTROL; HYBRID SYSTEMS CONTROL; HIERARCHICAL DECOMPOSITION

CONTROL OF ADVANCED SYSTEMS OF TRANSMISSION, SUSPENSION, STEERING AND BRAKING FOR THE MANAGEMENT OF THE VEHICLE DYNAMICS.

Università degli Studi del Sannio di Benevento
Abstract
This project wants to analyse, design, develop and validate experimentally new active control systems for the vehicle dynamics.
An automotive vehicle is a complex system, composed by the interconnection of various mechanical components. Each component is equipped with one or more electro-mechanical control device, which are commanded by a digital control system embedded in one of the electronic control units of the vehicle.

The driveline transfers the motion from the driving shaft to the wheels. Its main components are: the driving shaft, the clutch, the gear, the transmission, the differential unit, the steering and the wheels. The forces transmitted by the driveline to the wheels, the forces of the brakes, the interaction between the tyres and the street and the forces due to the suspensions, all contribute to determine the vehicle dynamical behavior. The control of the vehicle dynamics is achieved by controlling each of the components cited above and taking into account their interconnections.

The control systems projected for a vehicle have to drive its subsystems (or, if we want to consider the three dynamics in which the motion can be divided) such that it works as it is desired. This control problem can be solved in a decoupled way, by considering the dynamics as independent among them, or by considering the existing relation among them. This second way of work is important particularly when some dangerous situations have to be >>>

Principal Investigator
Luigi GLIELMO Università degli Studi del SANNIO di BENEVENTO
Research Objectives
Automotive vehicles are complex systems composed by the interconnection of various mechanical components. Each component is equipped with one or more electro-mechanical control devices, which are commanded by a digital control system embedded in one of the electronic control units of the vehicle.
The driveline is one of the most important vehicle subsystems. It transfers the motion from the driving shaft to the wheels. Its main components are: the driving shaft, the clutch, the gear, the transmission, the differential unit, the steering and the wheels. The vehicle behaviour depends from the complex interconnection among the constituting sybsystems. The control of the vehicle dynamic is achieved by controlling each component and taking into account their interconnections, so as to guarantee the driver good performances, the comfort, and a certain level of safety, during the different conditions of motion, such as on highways but also on crowded roads, where a higher probability of collision with vulnerable road users is expected.

The vehicle dynamic can be decomposed into three main components:
• the lateral dynamics, excited in curve, are characterized by the rolling and yaw motion, and influenced by lateral wind and tyres adherence. The analysis of these dynamics is interesting for the safety of the driver and for the passengers comfort. The existing systems for the stability recover, VDC and ESP, are actuated by steering actions or by >>>

Timescale
24 months
National and international background
In the last decades, modelling, identification and control of automotive systems has become an interesting research area. A great number of difficult problems appear from this multidisciplinary area [1].
One of these problems, very complex and significant, is the management of the vehicle dynamics on the road, and it can be studied by using a structured approach: the whole system is considered as the connection of different subsystems; first each subsystem is studied, and then all the subsystems are connected. Hence, the control of the whole system passes through the control of the single subsystems. Roughly speaking, the vehicle dynamics can be decomposed into the three directions of motion: lateral, vertical and longitudinal dynamics.
The suspensions are used for the control of the vertical dynamics; the suspensions, the brakes and steer are used for the control of the lateral dynamics, by using of ESP or automatic tracking systems (in curve); the brakes, the ABS system, the traction control systems, the clutch engagement and the gear box are used for the control of the longitudinal dynamics; all these control systems, among the other goals, have to guarantee comfort and drive safety.
From the methodological point of view, it is necessary to highlight that most of the problems above are characterized by nonlinearities, time varying parameters, different time-scale dynamics, and the intrinsically hybrid structure of various subsystems, e.g. the >>>