Project

Aim : Prepare a technical report explaining the model properties & comments on the results.

Objective : Carry out a system-level simulation of an all-terrain vehicle and prepare a technical report explaning the model properties & comments on the result.

All-terrain vehicle :- 

All-terrain vehicle is defined as motorized off highway vehicle design to travel on four low pressure or non pneumatic tyres ,having seat designed to be straddled by the operator and handlebars for steering control.

Study 1

case 1 : Simulink model for BAJA ATV with CVT -

MAJOR COMPONENTS IN THE MODEL : 

Continuously Variable Transmission drive (CVT):

It is better to have more gears in a transmission, since it can optimize engine speed in a variety of driving conditions. That means low gears can provide better acceleration while higher gears can maximize fuel economy. CVTs differ from traditional automatic transmissions in that they don't have gears that provide "steps between low- and high-speed operations. Instead, the majority of them work via a pair of variable diameter, cone-shaped pulleys connected by a steel or composite belt. The halves of each pulley are aligned with the pointed ends of the cones touching. These form a V-shaped groove in which the connecting belt rides. One side of the pulley is fixed, and the other side is movable, actuated by a hydraulic cylinder. The cylinder can increase or decrease the amount of space between the two sides of the pulley. This allows the belt to ride lower or higher along the walls of the pulley, depending on driving conditions, thereby changing the gear ratio.

CVT Block :-

VARIABLE TRANSMISSION RATIO:

Represents a variable ratio gearbox such as implemented by mechanical belt CVT, electric, or hydraulic transmissions. The physical signal input r defines the ratio of input to output angular shaft velocities.

Connections B (base) and F (follower) are mechanical rotational conserving ports. Specify the relation between base and follower rotation directions with the Output shaft rotates parameter.

ENGINE:

Represents a system-level model of spark-ignition and diesel engines suitable for use at initial stages of modelling when only the basic parameters are available. Optional idle speed and red line controllers are included. The throttle input signal T lies between zero and one and specifies the torque demanded from the engine as a fraction of the maximum possible torque.

Connections F and B are mechanical rotational conserving ports associated with the engine crankshaft and engine block, respectively. Connections P and FC are physical signal output ports through which engine power and fuel consumption rate are reported.

INPUT SIGNAL :-

CVT Gear ration input :-

 

Torque vs Engine speed output :

Vehicle Body :-

 

Output for case 1 :-

It is clear from the above graph that the vehicle attains its maximum speed (V = 55km/h) at full throttle =1 after 30 sec and then remain constant . the brake input value is 0. hence it has no effect on velocity

CVT Shaft RPM:-

 

Study 1 

Case 2 :-Simulink model for BAJA ATV with CVT using dashboard

Output  

case 2:-

CVT RPM shaft :-

Study 2

case 1:-

CVT block :-

CVT Gear Ratioo:-

Lookup table vuisualistion :-

OUTput:-

Vehicle speed :-

CVT RPM shaft :-

Study 2

Case 2:-Simulink model for BAJA ATV with CVT using LOOKUP table and dashboard

OUTPUT 

case 2:-

VEhicle speed :-

CVT shaft RPM:-

Conclusion :

thus we have successfully 4 different four models BAJA ATV WITH CVT and recorded the output