How can i model the engine starting behavior in simulink with Generic engine block and motor? Can anyone provide an expert opinion on this?

Hello, I want to model the engine starting scenario in simulink. I have the DC motor connected to battery. Motor and Engine are connected to a gear block. The engine is getting started, After that, both the engine and motor start to rotate in the same speed. Since the signal is torque, I am not able to disconnect the motor as soon as the engine gets started. Could you please help me with a solution?

Answer 1

[Martin]

The best way to model something like this is to think about what happens in the real system. So far, it sounds like a good start. In the real system, how does the starter motor determine when it should turn off? Does it run for a fixed time? Is it dependent on engine speed? If the time is fixed consider using a Signal Builder or Step block to have the torque go to zero after some time. If the starter motor turns off after the engine reaches a target value, consider adding a rotational velocity sensor to the engine output, and feeding the result to a conditional switch. The conditional switch could output 0 once the target speed is reached.

[johnson saldanha]

which is the conditional switch you are referring to. Could you please give an example