Dissimilar redundancy measurement of swashplate angle of variable pump based on the exact linearization model of EHCA

This paper mainly focuses on the swashplate angle dissimilar redundancy measurement of the variable displacement pump in the electrohydraulic compound integrated actuator (EHCA). Dissimilar redundancy means that the practical system can acquire more than one measurement values to describe a certain signal through hardware or software manners. Aiming to the need of software sensing, the signal needed to be rebuilt is computed from the system model. So it proposes the exact linearization model of EHCA to handle the nonlinear problem of load flow in this paper. Comparing to the linearization model which nearing the working point and the general nonlinear model, the exact linearization method which based on nonlinear transformation in EHCA modeling, is not only truly reflects system characters with simple linear control theory, but also provides a reliable model for computing swashplate angle by using other signals measurement value from sensors. This method provides a valuable reference model in the practical dissimilar redundancy applications.