Automated Manual Transmissions (AMTs) systems are generally constituted by a dry or wet clutch assembly and a multi-speed gearbox, both equipped with electro-mechanical or electro-hydraulic actuators, which are driven by a control unit, the transmission control unit (TCU). The operating modes of AMTs are usually two: semiautomatic or fully automatic. In both cases, after the gear shift command, the TCU manages the shifting steps according to current engine regime, driving conditions and selected program. In this transmission type the quality of the vehicle propulsion as perceived by the driver is largely dependent on the quality of the control strategies. This paper aims at investigating the engagement performance of an actively closed dry clutch by taking into account the inference of the pressure on the facing materials, the sliding speed and of the temperature on the main factors which affect the clutch torque transmissibility.
DRY CLUTCH MODELS FOR CONTROL OF AMTS/DCTS: INFLUENCE OF THE TEMPERATURE LEVEL ON FRICTIONAL AND ELASTIC CHARACTERISTICS
D'AGOSTINO, Vincenzo;CAPPETTI, Nicola;PISATURO, MARIO;SENATORE, ADOLFO
2012-01-01
Abstract
Automated Manual Transmissions (AMTs) systems are generally constituted by a dry or wet clutch assembly and a multi-speed gearbox, both equipped with electro-mechanical or electro-hydraulic actuators, which are driven by a control unit, the transmission control unit (TCU). The operating modes of AMTs are usually two: semiautomatic or fully automatic. In both cases, after the gear shift command, the TCU manages the shifting steps according to current engine regime, driving conditions and selected program. In this transmission type the quality of the vehicle propulsion as perceived by the driver is largely dependent on the quality of the control strategies. This paper aims at investigating the engagement performance of an actively closed dry clutch by taking into account the inference of the pressure on the facing materials, the sliding speed and of the temperature on the main factors which affect the clutch torque transmissibility.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
