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This paper mainly studies the locomotive braking system flowmeter. The purpose of this paper is to accurately measure and display the air flow rate of locomotive braking system. So we can judge the opened and closed state and the closed specific location of the coupling cock. This study can prevent the locomotive brake failure and reduce the number of traffic accidents. In this paper, the appearance...
In long trains equipped with pneumatic brake systems, the decay in pressure along the pipeline can be significant, altering the instantaneous braking force distribution from the first to the last car. Knowing the force distribution and the time until the brake forces stabilizes is important to design adequate vehicles and tracks. In this paper, a mathematical model that reproduces the dynamic response...
Pressure servo valve is usually used to regulate the pressure of the braking actuator to stop the wheel in traditional aircraft anti-skid braking system. The disadvantages of pressure servo valve include complex structure, high production costs, and the requirement for high quality of the hydraulic oil. In addition, its pilot stage is easy to block by contamination and has a constant leakage. This...
The 120-type braking device is an important equipment which offered emergency braking and safety deceleration when train run on tracks. Testing and investigating the performance of 120 air-control valve is a fundamental requirement for the train's safety. Experiment in the real railway operation lines brings lots of inconvenience to the research and development of new products. In order to reduce...
In a railway vehicle, a WSP valve is a key component for the safety of the vehicle and the supplementation of brake operation in impaired track conditions. The WSP controller detects sliding of each wheelset and reduces pneumatic brake force of the sliding wheelset. Due to the working of the WSP system, the excessive sliding or a locking of wheels is prevented. On the WSP system operating, the WSP...
The main purpose of this paper is to investigate the dynamic characteristics of the solenoid valve in an air brake system and as a result to decrease the response time. To realize the objective, this research presents the development and validation of a analytical dynamic model of a solenoid valve in a commercial vehicle, which is established within the multi-domain physical modeling. An experimental...
The brake system is the primary system in an automobile which ensures its safety on the road. The ideal brake system should operate with the least effort from the driver and should stop the vehicle within the minimum possible distance. This paper deals with the air brake system which is widely used in commercial vehicles such as trucks, buses and tractor-trailers. One of the important parameters which...
Brake systems in trucks are crucial for ensuring the safety of vehicles and passengers on the roadways. Most trucks in the US are equipped with S-cam drum brake systems and they are sensitive to maintenance. Brake defects such as leaks are a major cause of accidents involving trucks. Leaks in the air brake systems affect braking performance drastically by decreasing the maximum braking pressure and...
A new modeling and simulation methodology for a pneumatic brake system with ABS widely used in commercial vehicle is presented. The main parts of the pneumatic brake system such as air storage reservoir, tandem dual circuit brake valve, relay valve, ABS air regulating valve and diaphragm brake chamber are included and modeled by an object oriented implementation of the multi-domain unified modeling...
Air brake chamber, as the implementation component of anti-lock braking system in vehicle, its dynamic characterizations are important to the performance of the entire brake system. It based on the analyzing the theory of air brake chamber, to verifies the empirical formula through the method of FDD heuristic search and fitting the parameters of the formula that to be determined on the method of least...
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