利用CPLD实现故障诊断专家系统高速逻辑推理

Fast logic reasoning of fault diagnosis expert system with CPLD

专家系统的推理时间取决于问题的复杂程度,难以满足系统实时性要求,限制了其应用。对此,提出一种利用复杂可编程逻辑器件(CPLD)实现故障诊断专家系统高速推理的方法。详细分析了一般故障诊断专家系统推理过程;利用故障树的概念将专家知识转换为二值或多值推理,并用一般门电路,进而利用CPLD实现推理过程;将其应用于高压断路器故障诊断系统,代替原来的软件推理。经过实验验证,该方法实现的专家系统推理过程迅速,特别适用于基于单片机、数字信号处理器(DSP)等所实现的专家系统。

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.