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INIZIO_TESTO_DA_INDICIZZARE

RESEARCH PROGRAM

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Research Units
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Keywords
MECHANICAL TRANSMISSIONS ; VEHICLE PERFORMANCES; FUEL CONSUMPTION; POLLUTING EMISSIONS ; CONTINUOULSY VARIABLE TRANSMISSIONS; CVT; IVT; SPLIT-PATH TRANSMISSIONS; ROBOTIZED GEARBOXES; TRIBOLOGY; FRICTION; LUBRICATION; CAM-FOLLOWER MECHANISMS; MECHANICAL EFFICIENCY; VEHICLE DYNAMICS ; CONTROL; HIL REAL-TIME SIMULATIONS

THE ENHANCEMENT OF MECHANICAL TRANSMISSIONS FOR THE REDUCTION OF THE ENERGY CONSUMPTION

Politecnico di Bari
Abstract
Automobile powertrain systems and components are continuously subjected to innovation to obtain better comfort, safety, reliability, handling and a reduced environmental impact. A great deal of electromechanical systems are being developed with those aims as, for example, innovative engine control, electro-power steering, vehicle dynamics control Electronic Stability Program (ESP), the automatically controlled gearbox. Among these innovative solutions one of the most interesting are the Continuous Variable Transmission (CVT ), the Infinite Variable Transmission (IVT), the Dual clutch systems, the Gearbox Robotized. A large number of international researchs are devoted to the improvement and enhancement of these systems. Benefits due to save energy and performance increasing can be really relevant in comparison with traditional manual gearbox or automatic ones. Chassis control systems devoted to increase suspensions, brakes, steer, tires performance require a more accurate research finalized to integrate each single stand-alone system. This is also true in the case of the Hybrid Electric Vehicles (HEV), that because of their double power source (usually a thermal engine and an electric one), have the problem to manage the power supplied by the two engines. Thus power has to be appropriately combined or split by the variator and transferred to the wheels or reconverted into electric energy stored by the electric batteries.
The research units of this program have been >>>

Principal Investigator
Luigi MANGIALARDI Politecnico di BARI
Research Objectives
Nowadays mechanical transmissions are one of the most interesting research topic in the scientific and industrial field. These transmission are essential device in all machine systems, and their presence is diffused in every sector, from agricultural to automotive sector. High is the interest of researchers to find out new and original solutions that could improve the performance of mechanical transmissions, because their efficiency highly affects the behaviour of any mechanical system. Actually the continuously variable transmissions CVT and IVT, the former with a finite ratio range and the latter with a infinite ratio range, are capturing more and more interest in scientific and industrial research field. Investigations are being extensively carried out because these transmissions are able to optimise the performance of different mechanical systems and,by means of a suitable integrated transmission control strategy, to reduce the polluting emissions, the fuel consumption, and to improve the vehicle comfort. Moreover very simple configurations can be arranged for the continuous variator, which make it suitable for applications on low power vehicles as scooters.
The research units of this program have worked together in the past (COFIN 2000 and COFIN 2001) on the power train systems with excellent results, as demonstrated by their scientific publications. The activity consisted in producing theoretical-numerical models of the different mechanical transmissions under >>>

Timescale
24 months
National and international background
Automobile powertrain systems and components are continuously subjected to innovation to obtain better comfort, safety, reliability, handling and lower environmental impact. A great deal of electromechanical systems are developed with those aims like, for example, the engine control, the hybrid transmissions, the adaptive cruise control systems (ACC) the antilock braking system (ABS), the electro-power steering, the automatic stability control (ASC), the electronic traction system (ETS), the traction control system (TCS), the electronic throttle control (ETC), the electronic stability program (ESP), the gearbox automatically controlled.
Every car manufacturer of automobile carried out vehicles complete with those kind of systems known as active systems or x-by-wire systems. Innumerable are the researches managed on those subjects. Fundamental, to carry out the systems indicated formerly, is the know-how about powertrain mechanical components like engine, clutch, gearbox, axles, belts, tires and so on. That knowledge was due to the necessity to implement in the Electronic Control Unit whatever information useful to consider how a drivetrain component characteristics depends on phenomena like, e.g., wear, thermal dependence, operating conditions, backlash.
From this point of view it is important to evaluate the mechanical features of friction clutches and belts, because they are essential elements of the transmission system. At the same time the development of an >>>