Challenge

Project

DDhananjay Dhonukshe6 Feb 2022

AIM:- To Perform the simulink BAJA ATV vehical model by changing the parameter like throttle,break and observed the variations.

DISCRIPTION:- The model of BAJA ATV with Continuously variable transmission(CVT).

In This Model I Saw following Points,

1) Components of BAJA ATV

2) Vehical Model

3) Effect of Parameter varriation like throttle and break.

*Components of BAJA ATV

CVT:-

In this Continuously variable transmission (CVT) following blocks are used:-

1) Variable ratio Transmission:- The variable ratio transmission block represent the simple gearbox that dynamicaly transfer motion and torque between the two connected drive shaft axes B(Base) and F(Followers).the physical signal input r defines the ratio of input and output angular shaft velocities.

2) Inertia:- The block represent the ideal mechanical rotational inertia used as primary and secondary pully.

3) Ideal rotational motion sensor:- This block measure angular velocity or angle in mechanical rotational network.it sense the primary and secondary RPM only.

In CVT the primary pully get outward then seconday pully will inward that time speed speed reduction happenes. means radious of primary pully is less than radious of secondary pully.

and primary pully get inward and secondary pully outward that time overdrive happenes.means radious of primary pully greater than radious of seconday pully.

1st condition:- Rs>Rp = speed reduction

2nd condition:- Rp>Rs = Overdrive

Vehical Model:-

1) vehical body:-The vehical body represent a two-axle vehical body longitidinal motion.

2) Tire:- A Tire block model a tire is a longitudinal behaviour by the magic formula. an empirical equvation based on four fitting coefficients.

3) Double-shoe brake:-Represent the brake arrange as two pivoted rigid shoes symmentrically installed inside or outside drum and operated by one actuator.

4)Generic engine:- Represent a system level model of spark ignition and disel engine suitable for use at initial stage at modeling when only the basic parameter are available.

Dashboard:-

Here used for indication of Velocity, RPM,Brake input,Throttle input.

The Engine torque speed curve shown below:-

Signal builder:- It is used to set the gear ratio of CVT gear.for a different velocity,the CVT will have different gear ratio from signal builder.