Estimation of electropneumatic clutch actuator load characteristics

This paper propose a dynamic model of an electropneumatic clutch actuator system for heavy duty trucks. The focus is set on modeling of the clutch load characteristic which should be parameter affine, and the main purpose of the modeling task in this paper is to prepare for on-line adaption of this load characteristics. The knowledge of the clutch load characteristic is important for being able to estimate the pressure in the system online, when this is not measurable. In this paper off-line estimation is used to find parameters such that the model is a good representation of the system. The resulting 5th order model is verified by comparison to actual truck measurements.