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step response by Transfer Function with variable time constant

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Huanchen
Huanchen 2013-7-24
I want to make a transfer function 1/(Ts+1) in simulink. The time constant T can vary with the time here. For example, T=2 at time 0~3s, T=3 at time 3~10s. I've tried 2 methods to realize it:
1. I define T in the block "Transfer Fcn". T is calculated from the block "MATLAB Function".
2. I calculate the transfer function into time domain. Then I use the basic blocks such as Integrator, Substract and Divide to realize the transfer function.
I've tested my model with step response. Now the values of T which I want can be obtained.
The problem is: The step response is not smooth and continuous. At time=3s there is a unexpected sudden spring. I'm very confused. Please help me to explain this. How can I make the step response smooth and continuous? Thanks a lot !!

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Nicholas
Nicholas 2013-7-24
Maybe try using a different solver. Are you using real time or simulation time?

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