Project

Ans1:

AIM-To perform system level simulation of BAJA ALL terrain Vehical model and observe the vechicle speed and CVT shaft speed vs torque curve.

OBJECTIVE: To prepare technical report of BAJA ATV Model using with or without lookup table.

EXPLANATION:

a) ALL TERRAIN VEHICLE: All-terrain vehicle (ATV) known as a light utility vehicle (LUV), a quad bike is a vehicle that travels on low-pressure tires,and a straddle seating position, handlebar steering, and the ability to maneuver through a variety of terrain conditions.

b) Continuously Variable Transmission: A continuously variable transmission (CVT) is an automatic transmission that can change seamlessly through a continuous range of gear ratio. This contrasts with other transmissions that provide a limited number of gear ratios in fixed steps.

• It consist of a primary pully, variator and secondery pully and belt.
• when the variator of the primary pully moves inwards and the variator of the secondry pully moves outwards and it will lead the overdrive.
• IF the variator of the primary pully moves outwards and the variator of the secondry pully moves inwards and it will lead to speed reduction.

COMPONENTS OF A BAJA ALL TERRAIN VEHICAL: The main component of Baja ATV Given -

a) Suspension

b) Vehical body

c) Tire

d) Engine

e) Continuously Variable Transmission(CVT)

VEHICAL BODY: Vehicle body is the main supporting structure of a vehicle, to which all other components are attached.A two axle vehical body in longitudinal motion.The vehicle can have the same or a different number of wheel. vehicle body contain two front wheel and two Rear wheel.

GENERIC ENGINE BLOCK: The Generic Engine block represents a general internal combustion engine.The Generic Engine block uses a programmed relationship between torque and speed that is modulated by the throttle signal.

Speed-power and speed-torque parameter are provided. A throttle physical signal input specifies the normalized engine torque.

PORTS:

1) T- Throttle input signal lies b/w 0 and 1

2) F& B- Mechanical rotational conserving ports associated with engine crankshaft and engine block.

3) P&FC- Physical signal output port.

DOUBLE SHOE BRAKE: The Double shoe break block represent a frictional break with two pivoted rigid shoe that press against a rotating drum to produce a breaking action. The rigid shoes sit inside or outside the rotating drum in a diametrically opposed configuration. A positive actuating force causes the rigid shoes to press against the rotating drum. Viscous and contact friction between the drum and the rigid shoe surfaces cause the rotating drum to decelerate.

PORTS: IT Consist of two port.

• S - Rotational conserving port
• F - Physical signal input port

simulation process:

• The Throttle signal is generated by signal bulder block and apply to the generic engine block.
• The torque and speed vector are inputted from the workspace.
• The engine will generate the output rpm which can be taken from the crankshaft output . this speed will be given to the ideal rotational motion sensor to sence the output rpm.
• The same output speed will be given to a simple gear mechanism to reduce the speed where the gear ratio is 4.
• Then the output speed from the gear reduce will be given to the variable ratio transmission block.
• The speed is controlled by the variable cvt ratio and the controlled output speed is inputted to the vehicle axle.
• The break signal is generated by the signalbuilder and inputted to the vehicle body
• The power from the cvt is inputted to the axle and the vehicle acclerate according to the speed.

RESUlt:

I have attached result in pdf format