Project

AIM:- To prepare a technical report of simulation on BAJA ALL-TERRAIN VEHICLE(ATV) under different conditions.

OBJECTIEVS:- carry out a system-level simulation of an ALL-terrain vehicle prepare a technical report explaining the model properties and comment on the results.

ALL-TERRAIN VEHICLE:-an all-terrain vehicle,also known as a light utility vehicle,a quad bike,or simply a quad, as defind by the american national standards institute.is avehicle that travels on low pressure tires,with a seat that is starddled by the operator,along with handlebars for steering control.

PART:-1

SIMULINK MODEL FOR BAJA ATV WITH CVT:-

main components of above BAJA ATV,

• vehicle-body
• CVT
• Generic engine

CVT-block:- cvt is a continuously variable transmission is an automatic transmission that can change seamlessy through a continuous range of gear ratio.this contracts with other transmission that provide a limited number of gear in fixed steps.the flexibility of a cvt with suitable control may allow the engine to operate a constant RPM while the vehicle moves at varying speeds.

cvt have ;

• primary pully
• secondary pully
• variator
• belt

Rp<Rs(spped reduction) Rp>Rs(speed overdrive)

• Rp<Rs(spped reduction) primary variator pully moves to outwards and secondary variator pully moves inwards
• Rp>Rs(speed overdrive) primary variator pully moves to inwards and secondary variator pully moves outwards

inside the cvt block:-

• variable ratio gear
• cvt primary secondary rpm
• input and output inertia

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.

Generic Engine block:- Represents a system level model of spark-ignition and desile engines suitable for use at initial stages of modeling when only the basic parameters are avialable.operational idle speed and red line conrollers are included.

INPUT SIGNAL:-

a signal builder is used to create a signals for brake and throttel

here brake is 0 and

throttel is 0.5 up to 0sec-80sec

CVT Gear tratio input:-

Torque - engine speed input:-

Vehical body:-

OUTPUT:-

VEHICLE SPEED AND DISTANCE ,BRAKE,THROTTEL

HERE clear from the graph the vehicle max speed is 53kh/hr at hrottel 0.5 upto200sec and brake value is 0 and there is no effect of velocity.

CVT shaft speed:- for primary rpm and secondary rpm

this graph shows the variation in angular velocities of input and oupt shafts of the variable transmission system.the values different with respect to gear ratio.

PART:-2

SIMULINK MODEL FOR BAJA ATV WITH CVT USING DASHBOARD:-

in this model we have a dashboard which contain knobs to control the inputs.this model iput throttle and brake are not provided using signal builder. a knob is provided to control both parameters in real life users.

OUTPUT:- vehicle speed, distance, brake, throttle

in this case velocity of the vehicle is increased 0-60km/hr when the throttle is 1 and brake is 0

CVT shaft:- for primary rpm and secondary rpm

PART2:-

SIMULINK MODEL FOR BAJA ATV WITH CVT LOOKUP TABLE:-

CVT LOOKUP TABLE MODEL:-

LOOKUP TABLE BLOCK:-

approximate one dimensional method for using specified lookup method.f=f(x).f and x both are the input and output of the physical signals..

Enginee torque- speed curve:-

INPUT LOOKUP TABLE VISUVALIZATION:-

INPUT SIGNAL: CVT RATIO:-

VEHICAL SPEED:- velocity in km/hr ,throttle,brake

the above graph is vehicle speed is reaches to 0-65km/hr yhrottle is 0.3 for 0-20sec and again change the throttle is 1 at 20-200sec and brake value is zero..

CVT SHAFT SPEED:-for primary and secondary shafts

STEP2:-

SIMULINK MODEL FOR BAJA ATV WITH CVT DASHBOARD LOOKUP TABLE :-

OUTPUT SIGNALS :-

CVT RATIO:-

OUTPUT :-for speed,brake,throttle

speed is 55km/hr and throttle is 0.6 upto 200sec and brake is zero

CVT SHAFT SPEEDS:- primary and secondary shafts

CONCLUSION:-we have sucessfully run the 4 different types of BAJA ALL TERRAIN CVT models.record the velocity km/hr and cvt rpm values with respect to change the brake and throttle