Electrically Heated Catalyst Temperature Tracking Using Extended Kalman Filter Based Supertwisting Control

This paper’s primary focus is to evaluate the effectiveness of the Extended Kalman Filter (EKF) on a nonlinear controller Supertwisting controller (STC) for an electrically heated three-way catalyst (EHTWC) through a heating power control signal. The system has been modeled with taking in consideration three oxidation reactions, with well-referenced and experimentally calibrated kinetic parameters. The substrate reference temperature has been carefully set to ensure complete oxidation of undesirable toxic pollutants. The STC has demonstrated excellent performance in reference tracking and insensitivity to external disturbances, resulting in complete CO and C3H6 oxidation within 120 s, even during a cold start scenario. The heating power supplied by the STC is also chattering-free, which is essential for experimental assessment. The EKF has accurately estimated the required state, which has been used for both the controller substrate temperature tracking and observer Jacobians online derivation.