Project

CONTINEOUS VARIABLE TRANSMISSION (CVT):

Parts:

• Two canonical pulleys & a steel belt make up a basic CVT

output or driven pulley:

Steel belt connects this output shaft and rear wheel

• It contains primary &secondary pulley & variator,when the variator of primary pulley moves outward then the variator of secondary pulley moves inward then the radius of secondary pulley is greater than primary pulley

Rp<Rs ====>Speed reduction

• when the variator of primary pulley moves inward then the variator of secondary pulley moves outward then it is overdriven

Rp>Rs =====> over driven

SIMSCAPE MODEL:

• In signal builder the break input is given as 0 & throttle input is given as 0.3 for 1 to 10 sec
• Input & output shaft inertia represents the primary & secondary pulley
• To specify the ratio of a gear we use variable gear ratio block
• To connect the engine & CVT & speed reduction we need simple gear block
• Gear ratio block is used to measure the speed difference b/w output shaft & vehicle body,for this model it is calculated as 10

ENGINE:

• It represents the typical behaviour of a vehicle & the data inputs can be fed to generic engine inorder to plot the speed torque graph

CVT:

The ratio is fed to CVT block,in CVT the states of pulley are modelled here using two ideal mechanical rotational inertia blocks & gear ratio block

Gear ratio is fed to gear ratio block.

VEHICLE BODY:

This simscape model is designed for vehicle body and four simple tire blocks

Once the throtal input is given then the vehicle attains the maximum speed at a particular transition time.

vehicle readings in over drive

CVT ATV MODEL IN CLOSED LOOP:

By feeding data to loop up table in the CVT we can achieve closed loop system of this model

The data inputs to the Look up table is given through matlab script.