Control method of vehicle semi-active suspension system with vibration energy recovery function

Abstract

The invention discloses a control method of a vehicle semi-active suspension system with a vibration energy recovery function. The vehicle semi-active suspension system includes a damper, a spring, a control system and an energy recovery system; the damper includes a hydraulic cylinder, a hydraulic motor, DC motor, first transmission shaft, first roller clutch, second roller clutch, first bevel gear, second bevel gear, third bevel gear and second transmission shaft; the control system includes suspension vibration controller, force A sensor, a sprung mass acceleration sensor, a sprung mass displacement sensor, an unsprung mass displacement sensor and a DC motor driver; the energy recovery system includes an energy recovery circuit and a supercapacitor; and the control method includes two steps. The invention has high working stability and reliability, high energy feeding efficiency, can effectively prolong the service life of the vehicle-mounted storage battery, and can timely adjust the parameters of the semi-active suspension so that the semi-active suspension is in the best vibration reduction state.

Description

technical field [0001] The invention belongs to the technical field of automobile suspension systems, and in particular relates to a control method of a vehicle semi-active suspension system with a vibration energy recovery function. Background technique [0002] During the driving process of the car, due to the unevenness of the road surface and the vibration of the engine itself, the relative displacement between the sprung mass and the unsprung mass of the car is caused, which causes the car to vibrate. Most traditional suspensions use springs with constant stiffness and dampers with constant damping coefficients to form the core components of the automobile suspension system. However, due to the stiffness of the springs and the damping coefficient of the damper, they cannot be changed in real time according to the uneven characteristics of the road surface. , Therefore, the traditional suspension has poor adaptability to the road surface, and the vibration reduction effe...

AI Technical Summary

Problems solved by technology

Although the semi-active suspension shock absorber can realize the semi-active function, its structure is complex, difficult to produce and not easy to maintain, and at the same time, the production cost is high, and it needs to consume the energy of the vehicle itself

[0005] In recent years, due to the lack of resources and environmental problems such as air pollution, people have paid more and more attention to energy issues. Human beings have sought various methods to improve energy efficiency. Automobiles are one of the indispensable means of transportation in modern society. However, The energy utilization rate of the car is very low, the energy of the engine is generally less than 40%, most of the energy is dissipated in the atmosphere in the form of heat energy, and the braking of the car will also dissipate part of the energy. Vibration is an inevitable problem in the process of driving a car. Most traditional car suspensions convert vibration energy into heat energy through shock absorbers and dissipate it into the atmosphere, thus consuming a lot of energy in the car. Recycling has always been a hot and difficult issue in academic circles at home and abroad.

[0006] At present, the control algorithms of most controllable suspension control systems mostly use relatively simple algorithms. Each algorithm has its own advantages and also has its own shortcomings. frame deflection, but the improvement effect on vehicle body acceleration is unsatisfactory. Ground canopy control can improve vehicle body acceleration very well, but it has little improvement on suspension dynamic deflection. Although fuzzy control can comprehensively consider vehicle body acceleration, suspension dynamic deflection and tire dynamic However, it has high requirements on the accuracy of the mathematical model of the suspension system. At the same time, fuzzy control requires continuous accumulation and improvement of fuzzy control rules. Therefore, a single use of a certain algorithm will make the control system not perfect. At the same time, the automobile suspension system is an important A system with high real-time requirements, but most single control rules cannot meet the requirements of reducing or eliminating the time lag of the control system, but for the vehicle controllable suspension system, it includes many time lag links, such as: the time of the sensor collecting signal process Delay; the time delay when the signal is transmitted from the sensor to the controller; the time delay calculated by the controller; the time delay when the control signal is transmitted from the controller to the hydraulic cylinder; the time delay of the hydraulic cylinder action; the time delay generated by the hydraulic cylinder to establish control, etc.

The time lag will not only affect the performance of the suspension system, but also may lead to serious "wheel jump" phenomenon and cause the suspension system to become unstable, thus seriously threatening the safety of the car

Images