Half car suspension model matlab script and simulink

I have written a equation of motion and state space equation for a half car suspension model and I have also created a simulink for the same .My equation of motion and the respected simulink for the same is correct and I am getting a sinusoidal scope for the displacement and similary for the state space it is comming sinusoidal but when i am taking the difference of the two scope one which I took it from equation of motion and the the other from the state space the difference or error should be equal to zero but it not coming zero.Hence can anyone please check the error.

[Aditya Mishra]

I checked your script. Real part of some of the eigen values for A (state matrix) is positive. So your system is not stable.

[T, D] = eig(A)

Answer 1

[Kevin Oshiro]

FYI - MathWorks has the capability to model different suspension types using the Vehicle Dynamics Blockset.

Link to Suspension Library: https://www.mathworks.com/help/vdynblks/suspension.html