Project

AIM: To prepare a technical report of model level simulation of BAJA All-terrain vehicle(ATV) under different condition.

Objectives: Carry out a system-level simulation of an all-terrain vehicle and explaining the model properties and generate of results.

SIMULINK MODEL:

CVT Block:

A continuously variable transmission (CVT) is an automatic transmission that can change seamlessly through a continuous range of gear ratios. They are working on variable diameter cone shaped pulleys connected by belt. one pulley is connected to engine and other connected the wheel. These pulleys have two halves, Space betwwen the pulleys determine the gear ratio and speed of the vehicle. In CVT block uses Variable gear ratio block to optain the desired gear value and also shaft interia is also got considered. Ideal rotational sensors are used to determine the rpm before and after the gear variance.

ENGINE:

in engine block we can give speed vector and torque vector from data sheet which can be linked. This can determine the engine efficiency.

In vehicle body sub group we will give give mass, axle connection, drag details in it. wheel parameters can given if needed.

INPUT SIGNAL:

Through signal builder we can give signals of throttle and brake system which would control the engine.

We can give torque andd speed through the above curve.

OUTPUT:

CVT RPM:

Above graph will give the difference between the input RPM and output RPM of the Transmission (CVT) system.

VEHICLE SPEED:

At brake value 0, throtthle 0 to 1.4 for 20sec and then constantly increase in throttle,this will make the vehicle to attain velocity of 60 km/hr for in 18sec. then velocity of the vehicle is constant at 60km/hr.

SIMULINK MODEL WITH DASHBOARD:

In website they also added the same baja vehicle model with visual dashboard to change the throttle and brake. From this we can get the change in the velocity and rpm in dashbord inself. This can be achieved by giving stop time as inf.

CONCLUSION:

Thus I have analysed the simulink model of BAJA ATV with CVT and described the blocks which they have used and working of it and make records of Input and output RPM, velocity with respect to input throttle and brake signal.