| 摘要 |
In one aspect of the invention, a tire load estimation system for a vehicle is disclosed. The system comprises a tire (12) carried by a hub and supporting a vehicle chassis, the vehicle chassis generating a vibration resonant frequency; a hub-acceleration sensor mounted to the vehicle (34) operative to determine hub acceleration; an inertial measurement unit mounted to the chassis operatively connected to generate at least one chassis inertial signal taken from the group comprising chassis vertical acceleration signal and chassis pitch rate signal; a static load estimator operative to generate an estimated static load from the at least one chassis inertial signal; a sensor mounted to the tire (12) operative to measure tire inflation pressure; a tire vertical stiffness generator operative to determine a tire-specific tire vertical stiffness from the measured tire inflation pressure; and a tire deflection observer operative to calculate a dynamic load from the estimated static load, the chassis vertical acceleration, the hub acceleration, and the tire vertical stiffness. In a second aspect of the invention, a tire load estimation system for a vehicle is disclosed comprising a tire-supported vehicle chassis, the vehicle chassis generating a vibration sprung mass natural frequency in at least a bounce mode or a pitch mode of the sprung mass; an inertial measurement unit mounted to the chassis operatively connected to generate at least one chassis inertial signal taken from the group comprising a chassis vertical acceleration signal and a chassis pitch rate signal; and an observer model receiving the at least one inertial signal and operative to generate a dynamic load estimation based upon observed frequency change in the sprung mass natural frequency. |
