Fast logic reasoning of fault diagnosis expert system with CPLD

The reasoning time of the expert system lies on the complexity of the problem, which is difficult to meet the real-time requirement of the system. Thus the application of the expert system is limited. A new method to design expert system reasoning with CPLD (Complex Programmable Logic Device) for fault diagnosis is presented. The reasoning process of general expert systems is analyzed. The knowledge and experiences of experts are transformed into binary or multi-valued reasoning by using fault tree and the reasoning process is thus realized with simple gate circuit or CPLD. It is applied in the fault diagnosis of high voltage circuit breaker instead of original software reasoning. It is validated with test that the reasoning speed is faster, suitable for expert systems based on single-chip controller or digital signal processor.