Estimation of Tire Normal Forces including Suspension Dynamics

Louis Filipozzi, Francis Assadian, Ming Kuang, Rajit Johri and Jose Velazquez Alcantar
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Louis Filipozzi: Department of Mechanical and Aerospace Engineering, University of California, Davis, CA 95616, USA
Francis Assadian: Department of Mechanical and Aerospace Engineering, University of California, Davis, CA 95616, USA
Ming Kuang: Advanced Research and Engineering, Ford Motor Company, Dearborn, MI 48126, USA
Rajit Johri: Advanced Research and Engineering, Ford Motor Company, Dearborn, MI 48126, USA
Jose Velazquez Alcantar: Advanced Research and Engineering, Ford Motor Company, Dearborn, MI 48126, USA

Energies, 2021, vol. 14, issue 9, 1-13

Abstract: Tire normal forces are difficult to measure, but information on the vehicle normal force can be used in many automotive engineering applications, e.g., rollover detection and vehicle and wheel stability. Previous papers use algebraic equations to estimate the tire normal force. In this article, the estimation of tire normal force is formulated as an input estimation problem. Two observers are proposed to solve this problem by using a quarter-car suspension model. First, the Youla Controller Output Observer framework is presented. It converts the estimation problem into a control problem and produces a Youla parameterized controller as observer. Second, a Kalman filter approach is taken and the input estimation problem is addressed with an Unbiased Minimum Variance Filter. Both methods use accelerometer and suspension deflection sensors to determine the vehicle normal force. The design of the observers is validated in simulation and a sensitivity analysis is performed to evaluate their robustness.

Keywords: normal force estimation; unbiased minimum variance estimation; controller output observer; youla parameterization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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