Servo displacement control method for integrated hydraulic braking system
A technology of hydraulic braking and displacement control, which is applied in the direction of fluid pressure actuation system components, fluid pressure actuation devices, mechanical equipment, etc., can solve problems such as obstacles to servo displacement control strategies, and achieve the goal of overcoming nonlinear friction obstacles of transmission mechanisms, Guaranteed robustness and accuracy, compensating the effects of time-varying uncertain disturbances
Active Publication Date: 2021-11-23
JILIN UNIV
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Problems solved by technology
However, the integrated hydraulic brake system with electromechanical-hydraulic coupling has nonlinear problems such as friction of the transmission mechanism and time-varying characteristics of the hydraulic system, which seriously hinders its high-precision servo displacement control strategy.
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Embodiment
[0232] We tested the servo displacement control method of the integrated hydraulic brake system based on the adaptive radial basis neural network designed in this patent on the simulation platform built by MATLAB / Simulink.
[0233] Figure 4 , Figure 5 and Figure 6 Respectively, the control performance curves of the horizontal speeds of the target screw are 5mm / s, 30mm / s, and 70mm / s. From the test results of three sets of experiments, it can be clearly seen that the horizontal displacement of the lead screw follows well. At a speed of 5mm / s, the horizontal displacement tracking error of the screw is almost zero; at a speed of 30mm / s, the horizontal displacement tracking error of the screw is always within 0.5mm, which meets the actual pressure control accuracy requirements; at a speed of 70mm / s, the integrated The non-linearity of the mechanism of the hydraulic brake system increases, so the difficulty of its control is greatly increased.
[0234] However, the servo disp...
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The invention belongs to the technical field of automobiles, and particularly relates to a servo displacement control method for an integrated hydraulic braking system. The method comprises the following steps: 1, establishing an integrated hydraulic braking system model designed for a controller, and generating a complete dynamic balance equation at a lead screw shaft; 2, designing a high-precision integrated hydraulic braking system servo displacement controller by utilizing a backstepping theory and a sliding mode variable structure theory; and 3, adopting an adaptive radial basis neural network to compensate uncertain disturbance faced by the integrated hydraulic braking system. According to the method, the integrated hydraulic brake-by-wire system can be effectively helped to solve the problems of mechanism friction obstruction, hydraulic time-varying characteristics and other nonlinearity, high-precision servo displacement control is realized, a foundation is laid for the active braking function of the integrated brake-by-wire system, and the intelligent and electric requirements of an automobile are met.
Description
technical field [0001] The invention belongs to the technical field of automobiles, and specifically relates to a servo displacement control method of an integrated hydraulic braking system. Background technique [0002] With the continuous development of automobile intelligence and electrification, new functional requirements such as active braking and decoupling regenerative braking are put forward for the automobile chassis braking system. Since the electric vehicle has eliminated the engine, the braking system in the form of a traditional vacuum booster has lost the vacuum source on which it works. Moreover, the braking system in the form of a vacuum booster is usually difficult to integrate high-precision active braking and high-recovery regenerative braking functions. Therefore, many new brake-by-wire solutions have appeared on the market, such as integrated hydraulic braking systems. , Electro-mechanical brake-by-wire systems, electro-hydraulic brake-by-wire systems,...
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IPC IPC(8): F15B21/08F15B21/02
CPCF15B21/087F15B21/02
Inventor 赵健陈志成朱冰
Owner JILIN UNIV