BAJA CVT MODEL:

BAJA uses an engine that works on Countinious variable Transmission. The compitition mainly focuses on Offroading categeories of vehicle. There are few major component in BAJA ATV as listed below,

1.Vehicle body

2.Suspension

3.Tyre

4.Engine

5.CVT

6.Primary Pulley

7. Secondary Pulley

8. Variator

9.Belt

Input/output:

MODEL:

Input parameters depends on the throttle & brake inputs from the user. The Brake input & Throttle can be manually adjusted to have different velocity of the vehicle based on real time parameters.

The components highlighted in green are mechanical components.

GEneric Engine: Represents system level of spark ignition & diesel engine suitable for modelling application. It consists of 2 input & 3 output ports. The throttle input T liest between 0-1 signifies the torque demand by the engine. Connection F & B are mechanical conserving ports assosiated with engine crankshaft & enginne block respectively. Output Port P&FC are physical output ports through which engine power & fuel consumption rate are reported.

Engine sensor: It consists a subsystem in which RPM is sensed from R port which is connected to conserving outout port F of generic engine. The physical port W & A reports the angular velocity & Angle respective to R port relative to C.The measured angular velocity is positive when the angular velocity at port R is greater then that at port C.

Outport port C represents the rotational reference for the mechanical part.

CVT Block:

The block consists of multiple mechanical blocks like input shaft inertia, Variator, output shaft innertia,speed/rotational sensor.

INput & output shaft are represented by input shaft inertia & Output shaft inertia.

To specify the gear ratio we have variable gear ratio block.

Condition 1: If variator of primary pulley moves outward & that of secondary pulley moves inward such that the radius of secondary pulley will be more than that of primary pulley which helps in speed reduction.

Condition 2: If variator of primary pulley moves inward & that of secondary pulley moves outward such that the radius of primary pulley will be more than that of secondary pulley than the condition will lead to overdrive.

Now to connect the engine and CVT we need speed reduction,Therefore we will be using simple gear block.

Vehicle body:

Here we can enter the mass, air drag,CGlocation etc.

here H is mechanial translation conserving port with horizontal motion of vehicle body,V,NF & NR are physical signal outpuut ports for vehicle velocity and front & rear normal wheel forces. Connections W & beta are physical input ports corresponding to headwindspeed & road inclination angle.

Here we can also conclude that lower the Mass of the vehicle we can acieve high speed within short duration of time.

output:

depending upon the throttling of the vehicle the speed of pulleys automatically adjust itself as per desired gear ratio.