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 0:
1. A method for a vehicle, comprising:
estimating a road roughness index (RRI) of a road based on one or more of a pitch energy and a roll energy of the vehicle travelling on the road, wherein the RRI is further based on each of a first absolute wheel speed deviation energy of a first wheel, a second absolute wheel speed deviation energy of a second wheel, a third absolute wheel speed deviation energy of a third wheel, and a fourth absolute wheel speed deviation energy of a fourth wheel, and, in response to a higher than a threshold RRI, enabling a fuel economy mode of the vehicle; and
in response to a lower than the threshold RRI, maintaining a disabled fuel economy mode.