| Abstrakt: |
The vehicle would produce load transfer during acceleration and hill climbing, which led to the interference of tire pressure monitoring results. To address this problem, a tire pressure monitoring result compensation correction method was proposed based on tire loads herein. Dual estimation of vehicle mass and center of mass position was carried out based on Dual-UKF, and recursive least square (RLS) was used for slope identification. The data of load, vehicle speed, tire pressure and tire sinkage were collected by using a tire rotation hub test bench. The relational expression of load, speed, tire pressure and tire sinking were obtained by fitting the data. Using slope identification, the four-wheel independent load was calculated by estimating the vehicle mass and center of mass position to correct the corresponding wheel speed pulse. The test results show that the calculated values of tire pressure without load correction have 20% stable error and large fluctuation, with load correction, although there is a certain hysteresis and fluctuation, it will eventually converge to the true value quickly and the stable error is within 5%, which solves the problem of inaccurate tire pressure estimation due to load changes. [ABSTRACT FROM AUTHOR] |
