To view the contents of the model workspace select Modeling > Model Explorer, and click on Model Workspace from the Model Hierarchy list. This also helps avoid MATLAB workspace cluttering. Note that loading initial conditions into the model workspace keeps simulation data isolated from data in other open models that you may have open. Logged signals are marked with a blue indicator while streaming signals are marked with the light blue badge (see Figure 1). The model logs relevant data to MATLAB workspace in a data structure called sldemo_fuelsys_output and streams the data to the Simulation Data Inspector. The model loads necessary data into the model workspace from sldemo_fuelsys_data.m. Press the Play button in the model window toolbar to run the simulation. Modelingįigure 1 shows the top level of the Simulink model. When the sensor detects a fuel-rich mixture, corresponding to a very low level of residual oxygen, the controller decreases the fuel rate. If the sensor indicates a high oxygen level, the control law increases the fuel rate. This gives a good indication of the mixture ratio and provides a feedback measurement for closed-loop control. Typically, a sensor determines the amount of residual oxygen present in the exhaust gas (EGO). The target air-fuel ratio for this system is 14.6. stoichiometric) mixture ratio provides a good compromise between power, fuel economy, and emissions. ![]() The air-fuel ratio is computed by dividing the air mass flow rate (pumped from the intake manifold) by the fuel mass flow rate (injected at the valves). ![]() Physical and empirical relationships form the basis for the throttle and intake manifold dynamics of this model.
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