Project
Aim:
To prepare a technical report of simulation of BAJA All-Terran vehicle (ATV)under different conditions.
Objectives:
Carry out a system-level simulation of an all-terran vehical and prepare the techanical report explain the model properties & results.
ALL-TERRAN VEHICLE
An all-terrain vehicle, also known as a light utility vehicle, a quad bike, or simply a quad, as defined by the American National Standards Institute; is a vehicle that travels on low-pressure tires, with a seat that is straddled by the operator, along with handlebars for steering control.
Case-1
SIMULINK MOEL OF BAJA ATV WITH CVT
Major component in the model-
CVT-
The function of it is optomize the engine speed of the vairety of the driving conditions.low gear can be provided by beter accerlation while higer gears can maximum fuel economy. In which dont have gears that provides steps betweeln low nad high speed operations.The work of a pair vairiable diameter ,cone shape pulley connected by steel or composite belts. each pulley are aligned with the pointed end of the cone tuching.this form a v shape grooves in which the connecting the belt rides.one side of the puelly is fixed & other side is movable, acuated by hydraulic cylinder. The cylinder can increase the amount of space between the two side of pulleys.
CVT BLOCK
VARIABLE TRANSMISSION RATIO-
It is represent the variable transmission ratio of gear box such as implemented by mechanical belt,electrical or hydroalic transmission.the physical signal input are as the ratio of input to output angular velocity of shaft.Connection B &F are mechanical rotational ports.
ENGINE
It is system level of spark ignation & diesel engine sutable for the use at intial stages of modelling when the only basic paramerter vairables. in which the connecton F & B are mechanical rotational conserving port associated with the engine crancshaft and engine block.P & FC are physical signal output ports through which engiine power & fuel consumptions rate.
INPUT SIGNAL:
Gear ratio input-
VEHICAL BODY-
Case-1
SIMULING MODEL FOR BAJA ATV WITH CVT USING DASHBOARD:
In this model we have a dashboard which contain knobs to control the inputes,tn this case throttel % brake not provded using signal builder
If Brake=0 & throttel =0.5
CVT SHAFT RPM-
STUDY-2
Case 1
SIMULING MODEL FOR BAJA ATV WITH CVT USING LOOKUP TABLE-
Case 2
SIMULING MODEL FOR BAJA ATV WITH CVT USING LOOKUP TABLE WITH DASHBOARD-
The above fig. show that the BAJA atv with dashboard model using lookup table which consist throttel meter & brake input in the dash board & indicate a constant block rest of block are constant.
CVT RATIO
Velocity speed
In above figure brake is maintain at constant and increase the throttle which showes the increase the velocity.The flow of fuel increases when the throttle increases from 0.3 to 1 thous the power of engine increases. which defined as the gear ratio is directly proponal to the torque.
CVT SHAFT SPEED
Engine Torque -speed curve-
In the aove figure the torue is increase by the increase of engine speed.at the point of torque is decrease when the gear ratio incresae indore to achive the maximum velocities
In the above figure the velocitiy is varring wrt gear ratio the torqe is more the decrease the velocity,by changing the high gear, the ratio become less & the torqe also less which can get high velocities.