Project

Solution :-  

Aim of the Project :- Modeling of a Continuously Variable Transmission (CVT)  BAJA All Terain Vehical (ATV) behaviours on varrious point.

• CVT ratio input 
• Effect of output when throtal input and break input provided.

Model no 01 :- 

In this model Throttel input and break input is provided by Signal builder block.

Simscape Model :-

In this model Brake and throtten input provoded thrught singnal builder block the singnal are below

Brake and Throttle input Signal

In above signal brake input is at 0 position and Throttel input at 0.5 position constant.

This Signal provided to Generic Engine block throttel input point.

Genric engin port F,b are mehanical rotational conserving port, B point is connected with mehanical rotational reference point and  solver configration, F port is connectied with CVT throught Ideal rotational motion sensor. for rpm Sensor

CVT Ratio input value:-

0 to 10 sec

10 to 20sec

CVT model:-

In above model variable ratio gear provided input r thrught signal of cvt ratio input value.

In CVT model Input Shaft Inertia and output shaft Inertia is connected value are below

for input

For output

the value are m1 and m2 are below

For CVT rpm sensor there are 2 ideal rotaional motion sensor used one for input rpm of CVT Primary RPM and CVT Secondary Rpm Sensing.

CVT is connected with Vehical Body through simple gear block which has ratio of NF/NB = 10.

Vehical Body:-

In vehical body Double shoes brake is connected with both Rear wheel. Inclination angle is 0. Wind velocity is 0 in input port.

Below parameter are st for this vehical body.

Result :-After Run the Simulation Results are below

CVT Shaft Speed Scope :- In below scope output of cvt shaft speed the value of primary and secondary rpm of cvt.

From 0 to 2.84 sec cvt primary rpm is hight after that cvt secondary rpm is higher then primary.

Output Scope:-

in the above graph show 0 to 40 sec at constant 0.5 throttel input with no  break apply distance is increase and velocity is increase rapidly form 0 to 39 sec after that speed is almost constant .

Engine Torque Speed Curve:- 

In above curve show that at less rpm torque value is high and at 3500 rpm torque value is decresed.

Model no 02 :- 

In this model Throttel input and break input is provided by Dashboard input show below.

Simscape Model :-

CVT is connected with Vehical Body through simple gear block which has ratio of NF/NB = 10.

Initial condition:-  when run the simulation

Initial condition to run the simulation

Brake input=0

Throttle input=0.5

Parameter :-  all other parameter are same as above model 01.

Result :-After Run the Simulation Results are below

CVT Shaft Speed Scope :- In below scope output of cvt shaft speed the value of primary and secondary rpm of cvt.

Output Scope:-

At this situation CVT ratio

Model no 03 :- 

In this model Throttel input and break input is provided by Dashboard input show below. output Velocity value as a feedback or input in cvt ratio input throught 1d lookup table.

Simscape Model :-

Initial condition:-  when run the simulation

Initial condition to run the simulation

Brake input=0

Throttle input=0.3

Parameter :-  all other parameter are same as above model 01.

In this model input signal is provided through Brake input and Throttel input of Dashboard block. in model change some connection like CVT ratio input is provided through vehical body velocity output value or feedback value.

CVT model:- In this 

1D lookup table is used the parameter of lookup table is below.

CVT is connected with Vehical Body through simple gear block which has ratio of NF/NB = 12.

CVT Ratio Input graph:-

Engine Torque - Speed Curve:-

Result :-After Run the Simulation Results are below

CVT Shaft Speed Scope :- In below scope output of cvt shaft speed the value of primary and secondary rpm of cvt.

Output Scope:- Scope output when throttel and Brake input value output of Velocity is show below.

When gear ratio change to 12 to 15. and throttel input and brake input value chages out of velocity change.

CVT Shaft Speed Scope :- In below scope output of cvt shaft speed the value of primary and secondary rpm of cvt.

At this situation CVT ratio

Observation table:-

When observe all 3 model the points are below

S.No.		Model no. 01	Model no. 02	Model no. 03
1	Throttel Input provided by	Signal Builder Block	Dashboard block	Dashboard block
2	Brake Input provided by	Signal Builder Block	Dashboard block	Dashboard block
3	CVT Ratio Input signal by	Signal Builder Block	Signal Builder Block	Feedback value of velocity through 1 d lookup table
4	Gear Ratio	10	10	12
5	Initial condition Brake Input	0	0	0
6	Initial condition Throttle Input	0.5	0.5	0.3