Online onboard aeroengine models (OBEMs) have been widely used in health management, fault diagnostics, and fault-tolerant\ncontrol. A mismatch between the OBEM and the actual engine may be caused by a variety of factors such as health degradation\nor sensor fault and may influence the effectiveness of the systems mentioned above. However, mismatch caused by unpredictable\nsensor fault is hardly distinguished from that caused by health degradation through the tuning process. A fault-tolerant OBEM\ntuning structure is provided to perform the online tuning function when health degradation and sensor fault coexist. This system\nincludes three parts that include improved fault diagnostics and isolation (IFDI), a fault-tolerant OBEM tuning system (FTOTS),\nand a channel switching module. IFDI is used to distinguish the cause of mismatch and provide fault information, a FTOTS is used\nto complete an online tuning process based on information obtained from the IFDI, and the channel switching module is used to\nswitch the working process from the IFDI to the FTOTS. Several simulation results show that this system is able to distinguish the\ncauses of mismatch and complete online tuning in the case of sensor faults.
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