Development and modelling of an electropneumatic brake system

Abstract

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 affect the stopping distance of a vehicle is the brake response time. The work presented focuses on the development of an electropneumatic brake which would decrease the response time of the air brake system thereby providing a reduced stopping distance. A mathematical model that correlates the pressure transients in the brake chamber to the voltage input provided to the electropneumatic brake has been developed. The efficacy of this model is tested by comparing its results with experimental data obtained from various test runs.

Model-based analysis of the mechanical subsystem of an air brake system

“…A model for the pneumatic subsystem of the air brake can predict the brake chamber pressure given the displacement of the brake pedal as the input (Karthikeyan and Subramanian, 2009). By integrating the model for the pneumatic subsystem and the model for the mechanical subsystem, an overall model of the air brake system can be obtained.…”

“…An electro-pneumatic regulator is helpful in reducing the time delay between the moment at which the driver presses the brake pedal and the moment at which a braking force is generated at the wheels. This will decrease the response time of the air brake system and thus will lead to shorter stopping distances (Karthikeyan and Subramanian, 2009). The compressed air is supplied to the electropneumatic regulator via a pressure regulator and a mist separator.…”

Electronic structural improvement and experimental verification of a tractor-semitrailer air brake system

“…He 7 improved the parameters of the exhaust port of the brake and relay valves and modified pipeline parameters. Karthikeyan and Subramanian 8 applied an electronic regulator to shorten the response time of service brakes. Based on this research, Kumar et al 9 proposed a proportional–integral–derivative (PID) controller to reduce the response time when braking starts.…”

Study on braking stability of commercial vehicles: An optimized air brake system

“…He 7 optimized the parameters such as the exhaust space of the brake valve and the relay valve and the diameter of the pneumatic line to reduce the brake lag. Karthikeyan and Subramanian 8 proposed a proposal using an electronically controlled regulator instead of the foot valve to improve the braking response of the air brake system. Kumav et al 9 shortened the time required for brake start-up by adding PID (proportional integral derivative) controllers based on the research of Karthikeyan P. Wang et al 10 designed an electronic pneumatically controlled auxiliary brake device using a high-speed on-off valve.…”

“…The normally open solenoid valve (7) and normally closed solenoid valve (8) are set in the inflating and exhausting circuit, respectively, and there are three working modes. First, if they are energized, the compressed air flows from spring brake cylinder into atmosphere through normally closed solenoid valve (8) and the braking torque rises.…”