Phase and frequency error based asymmetrical AFR pulse reference tracking algorithm using the pre-catalyst O2 sensor switching output

摘要

A fuel control system of an engine system comprising a pre-catalyst exhaust gas oxygen (EGO) sensor and a control module. The pre-catalyst EGO sensor determines a pre-catalyst EGO signal based on an oxygen concentration of an exhaust gas. The control module determines a dither signal. The control module determines a fuel command based on the pre-catalyst EGO signal and the dither signal.