Abstract
In this paper, a control strategy combining the feedback linearization theory and sliding mode variable structure theory is proposed to solve various nonlinear factors, uncertainty of external disturbance and high-precision pressure control problems in the Direct-Drive Volume Control (DDVC) electro-hydraulic servo system. The nonlinear mathematical model of the DDVC electro-hydraulic servo system is established, and the nonlinear factors in the system are accurately linearized by the feedback linearization theory. The uncertainty of external disturbance in the system is compensated by the sliding mode control variable structure theory. The feedback-linearized sliding mode control algorithm proposed in this paper is verified using the DDVC electro-hydraulic servo system experimental platform. The experimental results show that, compared with the classical PID control, the proposed control algorithm can effectively improve the pressure output precision, as well as the dynamic response characteristics, of the DDVC system.
Highlights
As one of the three core components of new energy vehicles, lithium batteries account for about 40% of the cost of vehicles, but their performance directly determines the safety and range of vehicles
In order to ensure the consistency of the thickness of lithium battery pole pieces, the thickness accuracy is usually required to be ±0.5 microns, which puts forward a high requirement for the roller press of lithium battery pole pieces
The input voltage of the Direct-Drive Volume Control (DDVC) system is obtained by 7 ofthe feedback linearization controller, which is converted into the actual output speed by the servo drive unit
Summary
As one of the three core components of new energy vehicles, lithium batteries account for about 40% of the cost of vehicles, but their performance directly determines the safety and range of vehicles. From the National University of Defense Technology, derived the dynamic nonlinear model of the system by considering the perturbation and disturbance of the electro-hydraulic servo-valve-controlled force control system and designed the sliding mode variable structure control to compensate for the external disturbance and uncertainty. This algorithm can effectively improve the accuracy of the force tracking control [17].
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
