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 11:
12. A method for an engine coupled to an on-road vehicle, comprising:
estimating a road roughness index (RRI), wherein estimating the RRI includes estimating a pitch energy over a threshold distance based on an estimated longitudinal acceleration and a rate of change of a speed of the vehicle, and estimating a roll energy over a threshold distance based on an estimated latitudinal acceleration, a yaw rate, and the speed of the vehicle;
in response to the estimated RRI being lower than a threshold level, maintaining an amount of exhaust gas recirculation (EGR) delivered to the engine lower than a target amount of the EGR; and
in response to the estimated RRI being higher than the threshold level, increasing the amount of the EGR delivered to the engine to the target amount of the EGR.