中文摘要：

针对车载控制电源故障诊断计算量巨大、缺乏精确故障数学模型、子系统寄生参数的计算和分析方法目前还不明确的问题。提出了一种使用因果模型进行分布式故障诊断的新思路。将复杂的系统分割为相互具有一定独立性的多个子系统，这样，可针对每个子系统进行局部故障诊断，而无需考虑所有的结构和参数。一方面大大降低了诊断的复杂度，从而提高诊断的可靠性；另一方面，可针对每个子系统采取不同的、合适的诊断方法来提高诊断的准确性；样机于2010年在HXa30132。号车装车运用。

英文摘要：

Aimed on the massive computation burden, lack of precise fault mathematic model and uncertainty of analysis method on subsystem parasitic parameters, a novel distributed fault diagnosis method based on causal model is proposed.By the way of splitting entire system into several causal independent subsystems,the fault diagnosis can be divided, thus proper diagnosis method can be applied into each subsystem individually, without consideration of system frame and parameters.This method lowers the complexity of diagnosis so as to enhance the reliabihty.From another hand, using this method, different diagnosis technology can be used on each subsystem.the accuracy of diagnosis is also improved, the prototype is applied into electrical locomotive HXD0132 on 2010.