Project
AIM : to study the system level simulation of an ATV
KEYWORDS : CVT,lookup table,dashboard,baja ATV
SOFTWARE : matlab,simulink
OBJECTIVE
study the baja atv model without dashboard.
study the baja atv model with dashboard.
study the baja atv model using lookup table without dashboard.
study the baja atv model using lookup table with dashboard.
INTRODUCTION
Transmission which transmits the power from engine to the wheels through the shaft it consist of 4 types
1.manual transmission
2.continous variable transmission
3.semi automatic transmission
4.automatic transmission
A continuously variable transmission or CVT is a type of automatic transmission that provides more useable power better fuel economy & a smoother driving experience than a traditional automatic transmission. the CTV is a system that makes it possible to vary stepless the transmission ratio without interruption of the torque flow.therefore an infinite no of ratios are possible. it is an automatic single speed & gearless transmission that can shift through an infinite no of gear ratio.this ability to seamlessly shift through these diff gears provides a no of benifits including extreamly smooth shift & exceptional fuel economy.a CVT draws top engine power from a small engine which gives drivers quicker acceleration than standard automatic transmission because of their greater ability to control the engine speed range CVTs produse fewer emissions CVTs are also leighter weight than traditional automatic transmission.
STUDY
By using the simulink model of cvt consist of signal builder generic engine motion sensor vehicle body tyres & solver configuration blocks .the cvt subsystem includes transmission block i/p & o/p shaft inertia & motion sensors as shown in the vehicle body subsystem includes vehicle body block double drum break & tyres the initial engine speed is given as 2100 rpm mechanical rotation for driven pulley & driver pulley as 0.8 & 0.7 respectively the mass of the vehicle as 250kg & 2 axies which connects 4 wheels accordingly.
the signal builder is uesd as input for break throttle and gear ratio . break input is maintained as 0 for overall simulation the throttle input is given as 0.3 for 20secs and increases to 1 for overall simulation the throttle value is mainly to control the flow or amount of fuel into the engine if the throttle value increases the flow of fuel increases to the ic engine which inturn increases the power of the engine the gear ratio is maintained as 2.3 for 5secs and linearly decreases to 1.8 and maintained constant for overall simulation .
baja atv with dashboard model which consist throttel meter and break input in the dashboard instead ofgiving input through signal builder rest of the blocks and subsystem are common in the baja atv model without dashboard . the main concept of using dashboard is study the result by varying the input of break and throttle the velocity and speed of the engine the gear ratio is maintained as 2.3mfor 5secs and linearly decreases to 1.8 and maintained constant for overall simulation as the break input varies from 0-0.5 the velocity and speed decreses accordingly the throttle the velocity and speed of the engine and shaft increases.