Project
Aim:To prepare a technical report of simulation of BAJA ALL-Terrian vehicle (ATV) under different conditions.
OBJECTIVES: carry out a system -level simulation of an all-terrian vehicle and prepare a technical report explaining the model properties &comments on the results.
ATV:
ATV of full form is all terrian vehicle. it is defuned as a motorized off highway vehicle designed to travel on four low pressure or non-pneumatic tires,having a seat designed to be staddled by the operator and handlebars for steering control.
FOR QUESTION1:
CASE1:-
simulink model for BAJA ATV with CVT:-
Major components in the model :-
CVT(continous variable transmission drive):
It is a 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 accelersation while higher gears can maximize fuel economy.CVTs differ from traditional automatic transmission in that they dont have gears that provides "steps"between low and high speed operations.instead of the majority of them work via a pair of variable diameter ,cone-shaped pulleys connected by a steel or composite belt.
CVT Block:-
VARIABLE TRANSMISSION RATIO:-
A variable ratio gearbox such as implemented ny mechanical belt CVT,electric or hydraulic transmissions.the physical signal input r defines the ratio of input angular shaft velocities.
ENGINE:-
it represents a system level model of SI and diesel engines suitable for use at intial stages of modelling when only the basic parameters are available.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.
connection A&B are mechanical rotational conserving ports associated with the enginecrankshaft and engine blocks,respectively.connections P &FC are physical signal output ports through which engine power and fuel consumption rate are reported.
INPUT SIGNAL:-
The signal builder is used to create a signals for break and throttle inputs.
CVT gear ratio input:-
Torque vs engine speed input:-
VEHICLE BODY:-
OUTPUTS of case1:-
VEHICLE SPEED:-
It is clear from the graph that the vehicle attains its maximum speed(v=55km/hr) at full throttle-1 after 30 seconds and the remains constant.the brake input value is zero,hence it has no effect on velocity.
CVT SHAFT ARM:-
it shows the variations in angular velocities of input and output shafts of the variable gear transmission system.these values differ with respect to the gear ratio.
CASE2:-
Simulink model for BAJA ATV with CVT using dashboard:-
in this simulink we have a dashboard it contains knobs to control the inputs.in this case, the inputs are"THROTTLE &BREAK" are not provided using signal builder.a knob is provided to control both the parameter in real-time for the user.
OUTPUT FOR CASE2:-
Vehicle speed:
it can be obeserved from the graph that the velocity of the vehicle increses from o-50 kmph when the throttle input is 0.5 and the break input is 0.once the braking value increses from 0.1-0.5, the velocity of the vehicle decreases to 0 at a constant throttle value.this explain the direct relation of vehicle velocity with respect to throttle and brake inputs.
CVT shaft speed in RPM:
FOR QUESTION2:
CASE1:-
Simulink model for BAJA ATV with CVT using lookup table:
CVT block:-
The only differance between this model and the first model is that in this model,the gear ratio input to CVT is provided using a lookuptable.the vehicle velocity and shaft rpm outputs are same as before.
CVT gear ratio:-
OUTPUT for case1:-
VEHICLE SPEED:-
CVT shaft arm:-
both the results are same as that of the first case it is SIMULINK MODEL FOR BAJA ATV WITH CVT since the input parameters are same.
CASE2:
Simulink model for BAJA ATV with CVT using lookup table&bashboard:-
before going to give the input values of throttle and brake input
after giving the values of throttle and brake input and then after run the simulation daigram is in below
output for case2:-
Vehicle speed:
it is the similar to that of CVT dashboard case. the variation in vehicle velocity can be obeserved with change in throttle and brake inputs.with increasing the braking value the speed of vehicle decreases .
CVT ratio:
CVT shaft speed in RPM:
This indicates the variation in RPM of primary and secondary shafts with respect to input parameters.
CONCLUSION:
This i have successfully analyzed for 4 different models of BAJA ATV with CVT and recorded the outputs of its.with respect to variations in input of throttle and brake.