DRIVELINE MODELLING USING MATHMODELICA
P Nobrant · 2001
This thesis is a study of driveline modelling. The modelling is done in MathModelica. Components from the free standard Modelica library have been used when appropriate. The remaining components have either been defined by mathematical equations only or by using mathematical equations together with standard components. The main work has been put into modeling and verifying the clutch, manual gearbox, final drive, shafts, brake and wheel. To this, models of engine, driver, chassis and air drag have been connected and simulated during different driving cycles. The vehicle model is moving in longitudinal motion. The results shows the expected behaviours, however since no measurements has been available it is hard to say how near the truth the model is, just that the qualitative behaviour is correct. Notation For respective indexes applies # # a# # # . Engine # e engine angle [rad] m ac mass of air in the cylinders [kg] M e torque out of engine [Nm] p amb ambient pressure [Pa] p i intake manifold pressure [Pa] u e accelerator pedal signal Clutch # c,in angle of clutch input [rad] # c,out angle of clutch output [rad] # rel relative angular velocity, i.e. # c,in E# c,out [rad/s] # c friction coefficient between clutch discs c c,s,k ratio between maximum static and kinetic torque F c normal force pressing the clutch discs together [N] M c friction torque transferred in clutch [Nm] M c,k kinetic friction torque transferred in clutch [Nm] M c,s static friction torque transferred in clutch [Nm] M c,in torque driving clutch [Nm] M c,out torque out of clutch [Nm] u c clutch signal, 0 for free and 1 for fully engaged clutch Gearbox # g,in angle of gearbox input [rad] # g,out angle of gearbox output [rad] M g,in torque driving gearbox [Nm] M g,out torque o...