Reference no: EM132986719

EMS2SYM System Modeling

Simulink: Modeling Continuous Systems and Combining Subsystems

Aim
So far, we have created 3 models in the automatic throttle controller system including: Sensor, PI controller and PWM Conversion. This lab session will guide you to create the last model, Throttle and to combine all your models to form a complete automatic throttle controller system (Figure 1).

Figure 1: Block diagram of the automatic throttle controller system

Please make sure you save the result models and result pictures in a single folder, zip it by right click the folder, choose Send to, then Compressed (zipped) folder. Upload your zipped folder to the LMS link.

You submission should include at least the following files:
1. Throttle model file.
2. A picture of the Throttle model simulation.
3. compsystem.slx file.
4. A picture of overall system simulation.

2 Throttle Model
2.1 Model Description
The electronic throttle body opens and closes the throttle plate valve, which controls the amount of air inducted into the engine. This Throttle model takes 2 inputs: duty and direction which are produced by the PWM Conversion model (created in the last lab). The only output of the system is throttle angle, theta.

The system interface of the Throttle model is shown in Figure 2

Figure 2: Interface of Throttle model

When implementing this section, you will learn a concept of continuous system. In the context of a Simulink model, a continuous state refers to a variable whose value is determined through numerical integration of its derivative in time. The mathematical representation of a continuous system consists primarily of two sets of equations: the state derivative equation and the output equation.

3 Combine Simulink Subsystems
3.1 Description
We already created all the subsystems for the automatic electronic throttle control. Now, we need to connect them altogether. Please follow these steps:
Copy your PI-control.slx, PWM-conversion.slx, Sensor.slx and Throttle.slx files from Simulink 1, 2 and 3 labs to your current working directory, then convert those into subsystems
Copy compsystem.slx file to your current working directory and open it. You will see that all the required parameters are loaded on the Workspace once you have clicked and opened the file
Copy all the required subsystems created before into the compsystem model and connect them as shown in Figure 1
• Copy the ctr-input.mat (from LMS) to your current working directory and load its content.

3.2 Testing
Run the simulation to verify your entire automatic throttle control system.

You should see that the input is a step function to model an increase of 1 speed unit (i.e 1 km/h) and the throttle angle is adjusted with a gradual transition to give drivers smoother experience, rather than a sharp tran- sition. This is the whole idea of the cruise control in our cars.

Attachment:- System Modeling.rar