Establishment and Experimental Analysis of Runtime Humidity Soft Sensing Model of PEMFC Based on Internal Resistance

Abstract

The internal humidity is very important in Proton Exchange Membrane Fuel Cell, but it cannot be measured directly because of the closed structure of the cell. It has been proofed that humidity has strongly contract with some internal parameters such as resistance, temperature and gas pressure. After studying and analysis on classical humidity mechanism models, this paper operated some experiments on PEMFC runtime humidity based on soft sensing technology, then established and test humidity soft sensing model based on runtime internal resistance. The experiment results shown that the output value of soft sensing model matched well with the theoretical calculation data. And the errors were almost within 1%. It verified the effectiveness of soft sensing model based on internal resistance.