Hello,

I am doing vehicle simulation with sedan vehicle. A const motor torque was 
applied to the vehicle,  and the acceleration should  decrease  with the 
time because of the effect of AerodynamicDrag and roll resistance. However, 
when the step size of 1e-3 was applied, the acceleration and longitudinal 
force increase with time,  when 0.1e-3 was applied, the result is 
reasonable. During the process, I have switched the tire model type(Tmeasy 
or magic formula) and solver type, but it does not work. 

If I set the step size with 0.1e-3, the simulation cost too much time. For 
the common sense, the step size of 1e-3 can lead to a reasonable result, 
but it does not work in my simulation.

I would be very appreciated if you could give me some advice about this 
problem, thank you very much
[image: longitudinal force.png][image: acc.png]

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