Dry Dual Clutch Torque Model with Temperature and Slip Speed Effects

Abstract

Dry dual clutches are widely used in automated manual transmissions. In such systems the clutch engagement maneuvers require a precise knowledge of the characteristics that relate the frictional torque transmitted by the clutches with the corresponding actuators variables. In this paper a temperature and slip speed dependent model of the torque characteristic for dry dual clutches is proposed. Dynamic models of the temperature evolution are determined and linked to the characteristics of the mechanical components influencing the torque. The models, whose parameters are tuned with dedicated experiments and realistic data coming from an industrial automotive environment, show the temperature influence on the torque transmitted by the clutch. Real time simulation results, obtained through a detailed software in the loop driveline model, show that, if not compensated, the temperature variation can determine critical degradations of the clutch engagement performances. It is shown how the use of the clutch temperature estimation in the torque transmissibility model allows to compensate for such negative effects. The torque model is also exploited for the realization of a decoupling clutch engagement controller.

Simulation of Design Factors of a Clutch Pack for Power-Shift Transmission for an Agricultural Tractor

“…The transmission purposes to deliver the maximum engine torque through the clutch pack. The performance of the clutch depends on the transmission of the engine torque to the driven end [ 52 , 53 ]. Therefore, the optimal moment of inertia was 2 kg·m 2 because the maximum transmitted torque was 502.90 Nm at the driven end within the designed engagement time, whereas the engine’s maximum torque was 560 Nm.…”

Electric Motor and Dry Clutch Control in Launch Manoeuvres of Mild-Hybrid Vehicles Based on AMT/DCT Transmissions

“…For this reason, a lumped thermal model has been implemented to take the temperature rise into account during the slipping phase. The model is inspired to the thermal model proposed in (Pica et al, 2016) whereas in the present paper the cushion spring response to the temperature change is modelled in addition to frictional material response. The main hypothesis is that the whole mechanical work is converted into heat by friction phenomena and that it is equally distributed onto the frictional surfaces.…”

“…The electric motor (EM) can even play a crucial role to reduce the thermal stress in dry clutch automated manual transmission (AMT) and dual clutch transmission (DCT) during the slipping phase by avoiding critical values Pisaturo, Senatore & D'Agostino, 2017). Indeed, the most important problem with dry clutch systems like AMT and DCT is the overheating due to repeated shifting (Pica et al, 2016;Pisaturo & Senatore, 2016) that results in poor quality engagements or even permanent damage of clutch frictional materials or facings. Thus, the accuracy of clutch temperature estimation deeply affects the control unit decisions.…”

An Improved Design of the Engine Bench Test Tool for the Dual Mass Flywheel (DMF)

“…With the progress of technology and the reduction of cost, the application of DMF becomes more and more popular [1][2][3] . Luk's DMF was produced and sold about 100 million units in 2015 [4,5] . The DMF consists of two separate flywheels connected by an arc-spring for damping the engine oscillations, which is linked to the engine's crank shaft directly.…”