Patent ID: 11859571
Assignee: FORD GLOBAL TECHNOLOGIES, LLC
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  B  G  Y | IPC B  F  G

Claim 15:
16. A system for a vehicle, comprising:
a controller storing instructions in non-transitory memory that, when executed, cause the controller to:
estimate a longitudinal acceleration of the vehicle via a longitudinal accelerometer;
estimate a latitudinal acceleration of the vehicle via a latitudinal accelerometer;
estimate a yaw rate of the vehicle via a yaw rate sensor;
estimate a speed of the vehicle and a rate of change of the speed of the vehicle via a vehicle speed sensor;
estimate a pitch energy of the vehicle over a threshold distance based on the estimated longitudinal acceleration and the rate of change of the speed of the vehicle;
estimate a roll energy of the vehicle over the threshold distance based on the estimated latitudinal acceleration, the yaw rate, and the speed of the vehicle;
estimate a road roughness index (RRI) based on the estimated pitch energy and roll energy; and
in response to the RRI being higher than a threshold, selectively deactivating one or more engine cylinders via a variable displacement engine (VDE) mechanism while maintaining combustion in remaining engine cylinders.