Tire Force Estimation With Strain Gauge Measurement

Abstract

This paper provides a brief analytical overview of the existing methodologies for estimation of tire forces and proposes a new simple and effective methodology with sensor measurement such as elastic strains on different suspension parts. Although such an approach requires specific modeling and signal processing, it incorporates the wheel dynamics and avoids dealing with the rotating wheels. Validation using a 7DOF vehicle model and CarSim model showed good results comparing the estimated vertical tire forces and the actual tire forces obtained directly from the models. Initial vehicle tests point to the importance of sensor locations due to the complexity of 3D elastic strain fields near suspension mounts. Detailed finite element and experimental studies are required in order to optimize sensor positions, so any effects causing variations of such positions can be compensated by parameter adjustments based on specifically designed calibrating tests.