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Abstract: With the rise of automobile industry in recent years, the safety, comfort, effectiveness and energy saving of automobile in the running process have become one of the main projects in the field of electronic control system and technology research and development. As we all know, the improvement of overall vehicle performance depends on the coordination of subsystems. As one of the means to improve automobile performance, the integrated control method of automobile chassis plays a very important role in the field of automobile engineering research. As a research hotspot in the field of vehicle engineering, the application of chassis integrated control system can effectively mobilize the performance of the chassis system and make the chassis system run in a coordinated and stable condition, thus greatly improving the comprehensive control performance and level of the whole vehicle. Based on the theme of automobile chassis integration and control technology, this paper discusses and lays the foundation for the sustainable development of automobile operation.
Keywords: integrated control of automobile chassis; Integrated control background; Integrated control technology
DOI: 10. 16640/j . CNKI . 37- 1222/t . 20 19 . 08 . 053
Introduction to 0
The overall performance of the automobile chassis is realized by the driver's control consciousness of the automobile during driving, such as steering, acceleration, deceleration, deceleration and so on. The core goal of automobile chassis control technology is to develop in the direction of integrated control, and the main goal is to control the objects, means and internet technology of integrated control, which plays an important role in improving the specificity and comfort of automobile during operation. With the development of science and technology, automobile chassis control technology is developing towards integration, networking, intelligence and informationization.
1 background overview of integrated control of automobile chassis
The idea of 1. 1 automobile integrated control is put forward.
The earliest application of control technology in automobile field originated in 1970s, and corresponding laws and regulations were issued in terms of fuel economy and emission rationality, which opened the prelude to the application of control technology in automobile industry: the emergence of control technologies such as drive control system (TCS), anti-lock braking system (ABS), traction control (TRC) and active suspension system (ASS), which greatly improved the performance of automobiles in China. At the same time, cars
The research on automobile chassis control system in modern academic circles mainly focuses on suspension, steering, driving and braking systems. Because these factors are not necessarily related, when developing the system, the focus of the research is to achieve the corresponding control objectives of these systems, without paying too much attention to the influence of these systems on other subsystems.
1.2 development of integrated control of automobile chassis
At the end of last century, many theoretical achievements have been made in the theory of automobile integrated control. Based on the basic characteristics of automobile stability, Y.Ghoneim and w.Lin of the United States put forward the theoretical measures of proportional differential control and state feedback control, which fundamentally realized the integrated control goal of anti-lock braking and drive control. The vehicle dynamic model under steering condition is a theory put forward by Japanese T.Y.shimura and Y.Em.to This fuzzy control realizes the comprehensive control of the steering system and active suspension, adjusts the maneuverability and ride comfort of the vehicle, and achieves perfect results as a whole. British scholar R.Sharp put forward the theory of multi-objective integrated control based on two-way action, and applied it to the active control of automobile chassis system. German researcher Chtler designed a set of internal integrated systems such as ABS/ASR and ASS, which realized effective integrated control in vertical, horizontal and vertical directions. Cherokee. By designing multivariable coordinated control technology, the integrated control of automobile chassis system is realized. In the process of system realization, a set of dynamic braking, driving and rotating models is established.
Li Junhe Yufan, a domestic scholar, put forward the integrated control theory of steering system and braking system, suspension system and braking system, which improved the dynamic performance of automobiles. In 2004, the Automotive Power Laboratory of Beijing Institute of Technology introduced the integrated electronic control technology of automobile ABS/ASR/ACC. Through the test of Jetta GTX prototype, the hardware circuit and software logic of the control unit are integrated. The developed integrated electronic control system has excellent functions, and has made outstanding contributions in practicability and expansibility, which lays a foundation for the integrated research of automobile safety control devices.
Research on Integrated Control Technology of Automobile Chassis
2. Research on1Chassis Integrated Control Structure
2. 1. 1 integrated control
Integrated control presents all information dynamics, including sensors and other information, through a series of ordered units. The realization of this dynamic information is to realize the standardized control of actuators through the calculation process of multiple objectives. This control technology can effectively realize integrated control. Through the successful development of an integrated controller technology, it replaces the controllers of various subsystems and promotes the development of control integration technology.
2. 1.2 coordinated control
Coordinated control is a control mode between integrated control and subsystem control. This mode makes full use of the original control module on the basis of local conditions, and adds a coordination controller in the order of each sub-module to achieve the purpose of coordinating the work of each subsystem. The coordination controller will accurately explore the running state of the vehicle, identify the driver's consciousness in the working state, and distribute the control perception commands to the controller in the middle layer, and then the controller in the middle layer will manage and control each sub-actuator.
2.2 Exploration of chassis active control system
The chassis active control system can be divided into the following elements according to the vehicle motion state: lateral steering and yaw moment control, longitudinal braking and driving control, vertical suspension control and so on.
The development of automobile chassis control system technology is constantly improving, and the contact between tire and ground is emphasized in the development process. Because of the different trajectories of cars, the relationship between control systems is not isolated from each other, but constrained and interdependent. For the control of the actuator, each subsystem has a restrictive effect on it. For example, braking will be restricted and influenced by driver's consciousness, electronic stability system ESP, anti-lock braking system ABS and many other factors. The realization of the same control goal needs the help of several other control systems. For example, the stability in the steering process is achieved by means of active front wheel steering AFS, active rear wheel steering ARS, ESP and other factors. In addition, there are inseparable factors such as feedback control time, phase realization time, system and sensor redundancy.
3 Conclusion
With the rapid development of China's economy, the transportation and highway industries are growing. As a frequently used means of transportation, the car is an essential element in people's daily life. Since the reform and opening up, the research topic of integrated control of automobile chassis has never stopped. How to introduce active technology to balance the functions of automobile chassis, thus fundamentally improving the overall performance of automobile chassis system, has become the focus of researchers. This paper discusses the subject of automobile chassis integration and its control technology, and makes theoretical exploration for promoting the urbanization process in China.
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