Conceptual Evaluation of Closed-Centre Steering Gears in Road Vehicles
2012 (English)In: Proceedings of the 7th FPNI PhD Symposium on Fluid Power, 2012 / [ed] Massimo Milani, Luca Montorsi, Fabrizio Paltrinieri, 2012, 433-452 p.Conference paper (Refereed)
This paper is a study into the possibility to use a self-regulated pressure control valve as a way of realizing active steering into road vehicles by hydraulic means. From an actuator point of view, active steering refers to the possibility to control the assistance pressure via an external signal. From the steering system control loop, it is seen that the task of the steering system is to control the assistance pressure in each chamber of the assistance cylinder. A methodology is also derived for investigating the concept and finding a set of design parameters based on system requirements. This is based on a linear approach and later a simulation of the complete steering system with vehicle and driver. In order to assure good control accuracy during fast actuation of the valve a high gain is required. This would require an over damped valve with large proportions. This design was tested to verify the design methodology. A feasible design based on maximum available spool force was also tested. This design showed to large deviation in steering wheel torque compared to the original system.
Place, publisher, year, edition, pages
2012. 433-452 p.
Steering system, Closed-centre valve
IdentifiersURN: urn:nbn:se:liu:diva-93843ISBN: 978-88-7559-069-7OAI: oai:DiVA.org:liu-93843DiVA: diva2:627144
7th FPNI PhD Symposium on Fluid Power, June 27-30, 2012, Reggio Emilia, Italy