Project

Objective- Analyzing of the technical report of Baja All Terran Vehicle which involves model properties their configuration, their behavior with and without lookup table. Analyze the data at different gear ratio where we need to see at which gear ratio our AVT vehicle will be running perfectly.  

Introduction of Baja AVT- It build and race off-road vehicles that can withstand the harshest elements of rough terrain. Designed to combat the hazards of different kinds of terrain. They can be used in almost every worksite. Not only do they make travelling easier for drivers. they are also safe to use when transporting loads or cargo. As per its application is body shape and structure play very important role.

If we are talking about its main parts then we have-

1)- Body

2)- Suspension

3)- Tire

4)- Engine

5)- CVT (Continuously variable transmission)

SIMSCAPE model of a BAJA AVT model-:

Block used-

1)- Used Signal Builder to provide the input as a brake, Throttle and for CVT ratio

2)- Simulink to PS-Converter

3)- Solver Configuration

4)- Mechanical Reference

5)- Generic Engine- which is connected through Throttle input and output of the engine connected through the Engine sensor with solver and reference.

6)- Engine sensor- In which we have RPM sensor with PS-Simulink converter with scope as well.

7)- CVT- Which is connected through the output of the engine sensor with providing CVT ratio by signal builder block.

8)- Simple gear- Output of the CVT connected through the simple gear

9) Vehicle body- Which is connected through the simple gear.

10) Double shoe brake

11)- From to

12)- Go to

13)- Tire

14)- Inertia

15)- Physical modeling connection port

16)- PS terminator

17)- Rotational Motion Sensor

18)- Variable ratio gear

19)- integrator

20)- Gain

Types of models we have-

1)- BAJA ATV model without Dashboard

2)- BAJA ATV model with Dashboard

3)- BAJA ATV model with lookup table

Task-1- Baja ATV model without Dashboard

Workflow-

 In this model Firstly applied Brake input and Throttle by signal builder to the Generic engine. By throttle we applied 0.5 constant value. As we know during running brake value will be zero so Throttle value will be count. And throttle value is physical quantity and Generic engine is a SIMSCAPE block so we need PS-Simulink converter for that. As we can see in the graph. Output of the Generic Engine is fed to the CVT primary and rotational sensor is placed to detect the primary RPM of the CVT also a variable gear ratio block is in between the primary and the secondary of the CVT to change the gear ratio according to signal builder. Corresponding output of the Secondary of the CVT changes. There is also a rotational sensor which determine the speed of the secondary of the CVT. Then the output of the secondary CVT is fed through a simple gear to fine tune the speed of the rotation. And finally the output of the simple gear is fed into the vehicle.

 Generic Engine-

Connections F and B are mechanical rotational conserving ports associated with the engine crankshaft and engine block, respectively. Connections P and FC are physical signal output ports through which engine power and fuel consumption rate are reported

In this model port B connected as a mechanical rotation reference with solver equation and port F which is connected through engine sensor.

now we have engine sensor physical modeling connection port block. by this sensor we can determine the engine. Port c will connect through mechanical rotational reference.

The engine will generate the output RPM which can be taken from the crankshaft output. The speed will be given to the idea rotation motion sensor.to sense the output RPM.

The torque and speed vector are imputed from the MATLAB workspace.

The speed is controlled by a variable CVT ratios and the controlled output speed imputed to the vehicle axle.

The brake signal is generated by the signal builder and imputed to the vehicle body (double shoe brake) for applying the brake to the axle.

The power from the CVT is imputed to the axle and the vehicle accelerates according to speed.

Then the velocity is taken for the further analysis.

This plot of Torque - Speed curve is imputed from MATLAB workspace for the Generic engine to determine the speed. For the engine this is the default value for everyone.

Engine Speed plot- We can see that Engine speed is generated as per the Throttle, speed and torque.

This model is based on gear ratio 8.

This model is based on gear ratio 10.

At gear ratio 12 I got the RPM which is approx. 3836.

When we applied gear ratio 12 then we got the perfect RPM of the vehicle which is 3833 RPM.

Observation- By this model which is BAJA AVT model I have understood different graphs between different parameters like signal builder graph which work as an input of the Generic engine, Sensors majorly RPM sensor, converters etc. The resultant graph is the CVT primary and Secondary RPM graph, Velocity graph, and RPM graph which helps to determine that at which gear ratio our vehicle will be efficient as well as reached its proper desired RPM with proper velocity and Torque.

BAJA ATV model with Dashboard-:

Work description- Working model is same as earlier only the difference is that instead of Signal builder which we were using for brake and throttle we are using Dashboard with port for controlling of the user. The engine speed is generated according to input which are throttle, brake, torque and speed. some of them considered from MATLAB workspace same as earlier. The graph represents the behavior of throttle and brake by varying up and down.

As we can see in the graph that we have controlling through throttle input by nob and we are getting the output in the form of velocity and RPM.

Also, we have the output of the CVT primary and Secondary as well.

As we can see in the graph that is made by dashboard were also, I have made the gear ratio by 12 so we got the perfect RPM of the vehicle with Torque and Velocity. 

Mapped lookup table with dashboard-:

The work description is same as the earlier model but the only difference is that CVT ratio and Vehicle speed are extracted from “to workspace” model.

In the mapped model we have seen different categories at where we have CVT ratio is provided by Engine RPM with lookup table by signal builder also in different category we have same model with Dashboard.

In the dashboard model-: We got the CVT ratio by the feedback of the Vehicle velocity.

Plot the graph by Data inspector to know the graph of Engine RPM, Velocity, CVT primary and Secondary and the last CVT ratio. From the above these graphs where we have plotted all parameters same as different model so we can visualize the lookup table.

Observation by Lookup table visualization-:

From this graph we can understand at the gear ration 12 we got the perfect CVT ratio which helped the vehicle to get proper feedback to reach the accurate velocity at such RPM. At earlier graphs we had created the different plots as per different gear ratio but in the mapped model we have created all the plots in the same graph of by different gear ratio to under stand the behavior.