Project
In the BAJA ATV MODEL , showing vehicle modelling using genetic engine, vehicle body and CVT (continuous variable transmission). The vehicle modelling is done by defining the gear ratio and effects of parameter variation.
Here the model's agenda is
1. Components of a Baja ATV
2. Vehicle modelling
• defining the gear ratio
• effect of parameter variation
3. Incorporating CVT data the model
4. Key takeaways.
Here, the model, main part is CVT . It is a sub system contains variable ratio gear (from simscape/driveline/coupling and drives ), input and output inertia for primary and second pulleys, and their corresponding sensors .
Another main part is vehicle body from simscape/driveline/tires and vehicles and feed it's values, what we need and alongwith 4 tires, it's values are default values.
In the model, a generic engine and it has torque and speed vectors and these values getting from the torque - speed graph which we created seperately, it will feed to engine.
There is a signal builder it has break and throttle input. It's brake input is zero and its throttle input is 0.3 for 20sec and it is going to 1.
In the model has a condition, effect of parameter variation. They are CVT gear ratio and vehicle weight.
There is a another signal builder for CVT ratio and we create a signal into it. It is connected along with CVT block.
For speed reduction with CVT use Simple gear block from simscape/driveline/gears . Then feed the values into it.
There is a Goto1 block, where we logged some signals, which is created from simulation data inspector. For compare vehicles speed at different masses we use simulation data inspector. We can run multiple simulation at simulation data inspector. Then run the model.
In the model, there is a another condition that is incorporating CVT data in to the model. That is give some random values to CVT ratio . So we have 2 models 1. Open loop and 2. Closed loop
Both are script from comment window and feed to look up tables and attached to the CVT instead of CVT ratio signal builder.make a feedback coming from velocity and try to run. It will check the CVT ratio by calculating the required amount of CVT ratio.
In the result, we have dashboard contains throttle and brake input nobe and velocity and RPM meters.we have throttle input value as 1 and brake value as 0 at corresponding constant blocks. Now Run it and shows max velocity with max RPM .