Project

Aim

To Prepare a technical report of Simlation of BAJA All-Terrain Vehicle.

Objective

To carry out a simulation of all-terrain vehicle and to prepare a techinalnreport.

Explanation of All-Terrain VEHICLE

It is vehicle that drives with low pressure tires and the handle bars are widened.It is used offroad riding.

Simulink Model of BAJA All-Terrain Vehicle

CVT(Continuously variable Transmission Drive)

It is an automatic transmission.It is always batter to change seemlessly through a comntinuous range of gear ratios.With suitable control may allow the engine to operate at a constant rpm while the vehicle moves at varying speeds.It is not most automatic transmission.It is pulley based.The most commonly used type of CVT uses V-Belt.The V-Belt is that the halves if each pulley are alligned with end of cones.one side is pulley is fixed and the other side is movable,it's operated by a hydraulic cylinder.

CVT block

Variable Transmission Ratio

In this r dedines the rate of input to output angular shaft velocities.B and F are rotational ports.

Vehicle Body

Input Signal:

It is provided with the signal builder

CVT gear Ratio

Case 2:BAJA ATV with Dashboard

The above model consists of dashboard which consists throttle input and Brake input.The input is given with the dashboard and not using signal builder.The use of dashboard is to check the result of varying brake input and throttle input.By increasing the throttle the speed of the the engine increses.

Case 3:

A lookup table is an array of data that maps input values to output values.Given a set of inputs,lookup operation retrieves curresponding output.If lookupn table does not define input simulink can estimate the values using interpolation,extrapolation,or rounding value.

Lookup Table Visualization

The brake input and throttle input is given stepwise.The Simulink gets the input from Lookup Table and obtains output according to the input gear ratio.

Study 4:

The main concept of dashboard is to adjust the brake input and throttle input and observe the results.

The Simulink gets the input from the lookup table and obtains result accordit to it.

As the brake input is incresed,the speed decreases.

As the throttle is incresed,the speed of the engine and shaft increases.

At maximum torque the speed and the velocity decreses.

Output

1.Variation of velocity and shaft speed

In the above figure the brake is constant and the throttle is increased,which shows the increase in the velocity,thus the engine power increses.

In the above figure,Primary shaft is at high speed and secondary shaft is at low speed,its because the radius primary shaft is more than that of secondary shaft.

2.Variation of velocity and shaft speed

In the above figure,as the value of throttle input increses the velocity of the vehicle increses.By incresing the brake input the velocity of the decreses bases the input.

In the above figure,the primary shaft speed increses by increasing throttle input .In this the spped is directly propotional to the radius of the shaft.If the speed increses radius also increases.

Conclusion

1.As the throttle increses,the velocity and the speed of the shaft increses.

2.As the brake input increases,the velocity and the speed of shaft decreases.

3.Gear Ratio is propotion to the torque.As the gear ratio increases torque also increases.