Project

Carry out the system level simulation of all terrain vehicle

AIM:

To study, analyse and visualize the performance of BAJA all Terrain vehicle under four case studies in simulink.

BAJA ATV:

An ATV is designed in order to run on various terrains such as soil, gravel, pebbles etc. it is specially used to climb the mountain and down the mountain since it provides very good grip. It is a motorised off highway vehicle designed to travel on low-pressure tires and handlebards for steering control.

ATV is designed into two type:

(i)Type1-for the use of operator and no passanger

(ii)Type2-for the use of operator as well as a passanger

CVT-Continuously variable Transmission:

CVT ia an automatic transmission that can change through a continuous range of gear ratios.

Advantages of CVT:

• giving smooth driving
• more fuel efficient
• can continuously change its gear ratio
• lighter than traditional automatic.

Disadvantages of CVT:

• CVT is expensive to repair and replace.
• Overheating, slipping and sudden loss of acceleration.

CVT working

Manual gear system	Traditional Automatic gear system
has set number of gears	has set number of gears
driver determines what gear ratio they needs	it uses hydraulic system, that responds to pressure created inside that that determines the gear needed without any input from the driver.

CVT is similar automatic that is it doesnot need any input from the driver.

• CVT does not have gear, instead of that it has two pulleys.
• One pulley connects to the egine whereas another pulley connects to the wheel.
• A felxible belt will be connected between 2 pulleys.
• width of the pulley changes depending on hiw much power that the vehicle needs.
• When one pulley is larger and another one gets smaller.
• infinite number of gear ratio is possible in CVT since ther is no fixed pulley/belt.

Under the model we discuss about four cases such as

• ATV without dashboard
• ATV with dashboard
• ATV using lookup table without dashboard.
• ATV using lookup table with dashboard.

Main Blocks used in the BAJA ATV model is

1. CVT: Continuously variable transmission
2. Variable Transmission ratio: accepts the continuously varying gear ratio as a physical signal
3. generic engine: it is a general internal combustion engine.
4. Input signal such as Brake is device used to stop or slow down the speed and throttle is a mechanism by which fluid control managed by constriction.
5. Vehicle body: it is subsystem which contain some simulink blocks .
6. Double-Shoe Brake block represents a frictional brake with two pivoted rigid shoes that press against a rotating drum to produce a braking action

CASE 1: ATV without Dashboard

ATV model two input such as brake and throttle and the corresponding velocity and distance are viewed as output. Signal builder block is used to produce brake and throttle signal.

subsystem of CVT:

CVT subsystem has two shaft inertia such as input shaft and output shaft, variable ratio gear and RPM .

Vehicle body

vehicle body has two front wheel and two rear wheel which as inertia output shaft and double shoe brake.

Simulated results of ATV without dashboard

Brake:0

Throttle:0.5

CVT shaft speed is given below where primary and secondary RPM is compared

CASE 2: ATV with Dashboard

ATV uses Dashboard hence brake and throttle values can be changed and results can be observed as follow

Output of the second case is taken

ATV with dashboard Shaft speed is as follows.

CASE 3: ATV with lookup table with dashboard

Model diagram is

its output results are given below

ATV performance is measured and the results were plotted here the model is with dashboard along with lookup table.

Lookup table plot is

CASE 4: ATV with lookuptable without dashboard

the model is

its LUT file is also opened in its workspace.

the Output of the ATV with lookup table is

Observation:

• Simulation of BAJA All terrain vehicle with lookup table without look up table is done and results were observed.
• Simulation of BAJA all terrain vehicle with dashboard and without dashboard also done and results were observed.
• All results and models are visualized.