Abstract
In contrast to the traditional pneumatic braking system, the electronic-controlled pneumatic braking system of commercial vehicles is a new system and can remedy the defects of the conventional braking system, such as long response time and low control accuracy. Additionally, it can adapt to the needs and development of autonomous driving. As the key pressure regulating component in electronic-controlled pneumatic braking system of commercial vehicles, automatic pressure regulating valves can quickly and accurately control the braking pressure in real time through an electronic control method. By aiming at improving driving comfort on the premise of ensuring braking security, this paper took the automatic pressure regulating valve as the research object and studied the pressure change rate during the braking process. First, the characteristics of the automatic pressure regulating valve and the concept of the pressure change rate were elaborated. Then, with the volume change of automatic pressure regulating valve in consideration, the mathematical model based on gas dynamics and the association model between pressure change rate and vehicle dynamic model was established in MATLAB/Simulink and analyzed. Next, through the experimental test of a sample product, the mathematical models have been verified. Finally, the key structure parameters affecting the pressure change rate of the automatic pressure regulating valve and the influence law have been identified; therefore, appropriate design advice and theoretical support have been provided to improve driving comfort.
Highlights
Compared with the traditional pneumatic braking system of commercial vehicles, the electronic control pneumatic braking system gains improvement from electronic-control method; it can rapidly and accurately regulate the pressure in real time
Compared with the regular pressure regulator in traditional pneumatic braking systems, the automatic pressure regulating valve benefits from electronic-controlled methods and can react to the instructions of the system during the dynamic driving process and improve driving comfort while ensuring security, which is in line with the development of automated driving in commercial vehicles
In the braking process of electronic-controlled pneumatic braking system of commercial vehicles, braking pressure deviation and time deviation may result in failure of braking; the braking pressure and the braking time must meet expectations and the pressure deviation and the time deviation must be considered together, which are evaluated with pressure change rate
Summary
Compared with the traditional pneumatic braking system of commercial vehicles, the electronic control pneumatic braking system gains improvement from electronic-control method; it can rapidly and accurately regulate the pressure in real time. As the key pressure regulating component of the electronic-controlled pneumatic braking system of commercial vehicles, the automatic pressure regulating valve ensures security and improves driving comfort with reliable pressure regulating characteristics. F Feng et al investigated the characteristics of vehicle longitudinal jerk and vehicle longitudinal acceleration by using vehicle sensor data from the naturalistic driving study [15] In these studies, the research on pressure change rate mainly focused on hydraulic braking systems. Compared with the regular pressure regulator in traditional pneumatic braking systems, the automatic pressure regulating valve benefits from electronic-controlled methods and can react to the instructions of the system during the dynamic driving process and improve driving comfort while ensuring security, which is in line with the development of automated driving in commercial vehicles.
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