Side-slip estimation for ESP applications

Abstract

ESP (Electronic Stability Programme) applications require reliable data about vehicle state in order to operate correctly. One of these data is the vehicle side-slip angle. In this study, a nominal and a robust side-slip estimator are designed using static multipliers. The design is based on the well-known Single Track Model. Then, the performances of the estimators are analyzed using a more complex nonlinear model. With the nonlinear model, more realistic results are obtained because this model resembles a real vehicle in many aspects. After the construction of the nonlinear model and the Single Track Model, vehicle parameter values are set for these two models so that they behave similarly. Then, the sensitivity analysis is conducted to be able to determine the uncertain parameters, which are to be used during the side-slip estimator design. After the system is put in the LFT (linear fractional transformation) form, the nominal and the robust estimators are constructed using static multipliers. Finally, the obtained side-slip estimators are connected to the nonlinear model and the Single Track Model, and then results for di erent kinds of inputs and conditions are gathered and compared.