The Inertia Simulation System Based on Hydrostatic Secondary Control

Abstract

In the study on the braking system, the inertia simulator is necessary, which is generally realized by inertia plate. Its advantage is simple and accurate, whereas the disadvantage is the larger volume and difficult to be adjusted. This paper presents a novel scheme, which is realized by hydrostatic secondary control circuit. The inertia can be increased and decreased by electro-hydraulic servo control through momentum feedback, in which a dual variable servo pump is adopted, with the velocity and torque feedback loops applied. In the beginning, it is set as speed control mode until it reaches the braking speed. Meanwhile, it turns to the sate of inertia simulator, which is the torque control mode, so as to keep the inertia as set value. The function of inertia simulation system based on hydrostatic secondary control is to simulate the momentum, which is realized by momentum feedback control, and it can be calculated through accelerator and desired inertia. The variable pump is driven by constant pressure network, and the variable swashplate is controlled through servo valve. The torque feedback and speed feedback guarantee the control performance requirements. Since there are some problems of nonlinearity, instability, strength friction, etc. a hybrid fuzzy control method are adopted to get higher dynamic control precise and steady characteristics. It is concluded that the scheme and control method is available and validity.