Intelligent tire-based road friction estimation system and method

摘要

A road friction estimation system and method includes tire-affixed sensors and on-board vehicle sensors, a model-based tire force estimator operable generating from sensor-input a model-derived tire force estimation, a vehicle observer generating an observer-derived tire force estimation and a friction estimator generating a road friction estimation from a comparison of the model-derived tire force estimation and the observer-derived tire force estimation.

主权项

1. A road friction estimation system for a road on which a vehicle is traversing, comprising:
the vehicle having at least one supportive vehicle tire, the vehicle tire having a tire cavity and a ground-engaging tread, and the tire having a plurality of tire-specific parameters; a plurality of tire-affixed sensors mounted to the tire operably measuring the tire-specific parameters to generate tire-specific information; a plurality of on-board vehicle sensors mounted to operably measure a plurality of vehicle-specific parameters to generate vehicle-specific information; a model-based tire force estimator operable to generate a model-derived tire force estimation; a vehicle observer operable to generate an observer-derived tire force estimation; a friction estimator operable to generate a road friction estimation from a comparison of the model-derived tire force estimation and the observer-derived tire force estimation; wherein the vehicle observer receives a plurality of inputs based upon the tire-specific information; and wherein the plurality of inputs to the vehicle observer comprises: a load estimation for the one vehicle tire; a slip angle estimation for the one vehicle tire; a cornering stiffness estimation for the one tire.