Challenge

Project

Aim

Study system level simulation of an all-terrain vehicle.

Basic Information

In this Four Type of transmission we study hear only Continuous Variable Transmission.
The continuous variable transmission is give a smoother driving experiance, Better Fule Efficiency and Stepless Driving Experiance.
CVT draw maximum engine power of any point of time, so it give quicker acceleration than standard manual or automatic transmission.
CVT is also light weight than other traditional transmission system.

Explaination of all cases

Case 1

Explaination

In this case we study baja ATV model without dashboard.
In this model we use Signal builder, Generic Engine, Motion Sensore, Vehicle Body, Vehicle Transmission System, Scop etc.
This model has CVT subsystem and vehicle body subsystem which shown in fig.

In this model initial engine speed is 2100 rpm.
Mechanical rotation of Driven & Driving pully is 0.8 & 0.7 respectively.
In this case mass of vehicle is 250kg and 2 axles 4 wheel system is used.
In this system we provide throttle, brake and gear ratio using signal builder block.
In this case throttle input is 0.3 for 20s and increases to 1 for all time of simulation.
The brake value is 0 for overall simulation.
In this case gear ratio is 2.3 for 5s therfore it linearly decrease to 1.8 and after it maintain constant for overall simulation.

Results

This fig shows four diffrent signals which is Velocity, Distance, Throttle and brake.
The value of throttle is simmilar to throughout the simulation.
Velocity is increse 0 to 50 in 40s because of inrtia of vehicle body.
brake input is 0 through out the simulation.

This fig is shows CVT Primary and CVT Secondry RPM.
In the initial condition CVT Primary rpm is high because high torque is reqired.
Whene vehicle start moving primary CVT rpm is goes down and secondary CVT rpm is goes up.

Case 2

Explaination

In this case we study baja ATV model with deshboard.
In this case we adjust throttle and brake using dashboard.
Rest of the input like gear ratio is same as baja ATV model without dashboard.
RPM and Velocity meter is also provided on dashboard.
In this model we use infinite time simulation so we can set throttle and brake using given pot on dashboard.
We also see how rpm and velocity is changed by applying input.
In this model gear ratio is maintain by 2.3 for 5s and linearly decreases to 1.8 after is constant to overall simulation.
As we seen on running simulation we increase throttle rpm and velocity is increase.
When brake is apply velocity is decreases.

Results

Case 3

Explaination

In this case we use baja ATV model using lookup table without dashboard.
In this model we use Generic Engine, Vehicle Transmission System, Vehicle Body, Configuration block etc.
Vehicle body subsystem is shown in this fig.

In this model we simulate model using step time method.
In this model two subsystem are present which is CVT subsystem and vehicle subsystem
As the shown in fig CVT subsystem includes look up table.

The initial engine speed is given as 2100 rpm.
Mechanical rotation for driven and driver pully as 0.8 & 0.7 respectively.
The mass of vehicle is 250kg and it works on 2 axle 4 wheel arrengment.
In this model brake input and throttle input is given by step input.
brake input is remain 0 througout the simulation but throttle value is initial 0.3 and after 35s it goes up to 1.
For CVT ratio we use lookup table which provide input gear ratio to CVT block.
This method is very effective which can avoid the unusual torque at the certain speed and very easy to achive greater velocity & engine speed.
In this model gear ratio is vary from 2.3 to 1.8.
In this model maximum velocity is achived by 57kmph approximately.

Results

As we seen in the graph we increase throttle value velocity of vehicle is increase.
brake value is remain 0 through out the simulation.

Case 4

Explaination

In this case we study Baja ATV with dashboard model using lookup table.
This model consist rpm and velocity meter and brake and throttle input in dashboard.
Rest of the system is common as the above baja ATV model without dashboard.
The main concept of this model is study output when we vary the input parameter throttle and brake.

Results

In this model results are same as a Baja ATV model mapped without dashboard.
oOnly diffrence is hear we changes throttle and brake value in simulation and observe output.

Conclusion

By simulating this four model we learn about how to Continuous Variable Transmission System work.
As a conclusion we say that when throttle value is increase engine poewer is increase and then velocity of vehicle are also increase.
Gear ratio is continuously increse or decrese based on torque demand and throttle or brake input.
Whene brake is apply value of velocity is decrease and engine power is also decrease.

Ship work like this
in your own course.