Gear shift mechanism (Simulink & Stateflow)

Question 1:

Explain automatic transmission system through a simplified block diagram.

• The torque converter is what transmits the torque from the engine to a rotating driven load. In an automatic transmission car, the torque converter connects the power source to the load. Torque converters allow you to shift up through the gears more quickly with less horsepower loss, because they eliminate that lag between optimum rpm and the fall-off in power until the next gear is fully engaged. This improves fuel economy.
• The gearset connects to the differential and shafts, which continuously adjusts its gear ratio according to the speed-torque requirements of the vehicle. The transmission control unit acts as the feedback receiver which instructs the gearset and engine on what needs to be done to meet the power demand of the vehicle

Question 2:

For a given engine speed and vehicle speed, create a model to select a particular gear for given speed range.

The input to the model will be engine speed profile and the output will be the selected gear.

Assume the right gear for the correct speed range.