Hello Ryan,
The assertion error saying:"Engine Speed has exceeded the last value of the Speed vector parameter * " occurs when the engine (crankshaft) has exceeded the maximum tabulated speed input. I made the following observations while simulating your model:
- The external resistance to the system is very low. In your model, I do not see any external disturbances such as drag or path gradients being modeled.
- The initial velocity of the engine is set very high; it is currently 5000rpm. If the engine starts at this speed and you give high throttle (say, T=1), the crankshaft is supposed to accelerate and its speed will increase with no limit (since there is not enough external disturbance).This will eventually result in the crossing of the maximum speed specified (i.e 13700rpm) for crankshaft eventually. So you might want to consider reducing the initial speed of the crankshaft.
- The issue can be avoided by decreasing the initial speed of the engine to a lower value, say 1000rpm. By doing this you are giving enough scope for acceleration into higher speeds. Also, I think, in your model one of the three gears will always be active and no neutral gear is modeled. So any initial speed of the engine will mean an initial velocity of the car itself.
- The issue can also be avoided by adding the RPM-Torque data corresponding to higher RPMs (say, tabulate RPM-Torque up to 50000RPM). Just for the verification purpose, you can add some dummy RPM-Torque at the end of the table (I know this is a ridiculous workaround).
I highly recommend you to go through the following example which captures a lot of key vehicle modeling techniques (please give special attention to the transmission system modeling): http://in.mathworks.com/help/physmod/sdl/examples/vehicle-with-four-speed-transmission.html
I hope you will find this answer helpful.
Regards,
Suhan
