VEHICLE MOTION CONTROL SYSTEM

A vehicle motion control system 1 includes a vehicle state amount obtaining means configured to obtain a reference yaw rate and an actual yaw rate of a vehicle 10, a vehicle state estimating means configured to determine OS/US determinations based on the reference yaw rate and the actual yaw rate, and a vehicle motion control means configured to execute a vehicle motion control based on a result of the OS/US determinations. In the vehicle motion control system 1, a high-pass filter unit 312 of a control unit 3 executes a high-pass filter process for removing a component equal to or less than a predetermined cut-off frequency from the reference yaw rate and the actual yaw rate. Then, an OS/US determining unit 313 executes the OS/US determinations based on a deviation between the reference yaw rate after the high-pass filter process and the actual yaw rate after the high-pass filter process.