How to set the simulation speed on jsbsim via dronekit

Hi , I’m on droneit using the JSBSIM simulator. I would like to speed up the simulation time. So I 've found the parameter SIM_SPEEDUP. But I don’t know how to set it… I’ve tried vehicle.parameters[‘SIM_SPEEDUP’]=10
BUT it does not work ,i f you could help me ! thanks you , I must fixed it tonight :grinning: