The growing demand of Automated Manual Transmission (AMT) in modern vehicles has led up to a rapid gain of market share of this type of transmission, especially respect to the Manual Transmission (MT) [1]. In fact, for market sectors such as large-series and ecological cars, AMT has the advantage of lower weight and higher efficiency with respect to other typologies of automatic transmissions. In AMTs the quality of the vehicle propulsion as perceived by the driver is largely dependent on either the quality of the control strategies and the fast dynamics of the clutch subsystems. Furthermore, sensitivity analyses on control schemes for this type of transmissions have shown that uncertainties in clutch torque characteristic can severely affect the engagement performance: the availability of a physical frictional model of the specific clutch architecture is a crucial issue in order to design robust engagement model-based control strategy [2], [3]. In this paper a high order dynamic model of the powertrain system which includes the electro-hydraulic actuator dynamics has been analysed to design a feedback controller based on multiple Model Predictive Controller (MPC) [4], [5]. The MPC is developed to comply with constraints both on the inputs and on the outputs. The controller aims at ensuring a comfortable lockup and avoiding the engine stall even with reduced engagement time. Simulations of start-up manoeuvres prove the effectiveness of the proposed control strategy and encourage the development of real-time routines for the testing on transmission control unit.

MODEL PREDICTIVE CONTROL FOR ELECTRO-HYDRAULIC ACTUATED DRY CLUTCH IN AMT TRANSMISSIONS

D'AGOSTINO, Vincenzo;PISATURO, MARIO;SENATORE, ADOLFO;CAPPETTI, Nicola
2014

Abstract

The growing demand of Automated Manual Transmission (AMT) in modern vehicles has led up to a rapid gain of market share of this type of transmission, especially respect to the Manual Transmission (MT) [1]. In fact, for market sectors such as large-series and ecological cars, AMT has the advantage of lower weight and higher efficiency with respect to other typologies of automatic transmissions. In AMTs the quality of the vehicle propulsion as perceived by the driver is largely dependent on either the quality of the control strategies and the fast dynamics of the clutch subsystems. Furthermore, sensitivity analyses on control schemes for this type of transmissions have shown that uncertainties in clutch torque characteristic can severely affect the engagement performance: the availability of a physical frictional model of the specific clutch architecture is a crucial issue in order to design robust engagement model-based control strategy [2], [3]. In this paper a high order dynamic model of the powertrain system which includes the electro-hydraulic actuator dynamics has been analysed to design a feedback controller based on multiple Model Predictive Controller (MPC) [4], [5]. The MPC is developed to comply with constraints both on the inputs and on the outputs. The controller aims at ensuring a comfortable lockup and avoiding the engine stall even with reduced engagement time. Simulations of start-up manoeuvres prove the effectiveness of the proposed control strategy and encourage the development of real-time routines for the testing on transmission control unit.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4504257
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