Brake System Performance at Low Operating Pressures

IEEE Trans. Intell. Transport. Syst.

2006

Section: A Background and Motivationmentioning

confidence: 99%

A Diagnostic System for Air Brakes in Commercial Vehicles

IEEE Trans. Intell. Transport. Syst.

2006

“…The aim in this thesis is to develop a model that can predict the pressure transients over a wide range of supply pressures and also at partial brake applications. Such a model is highly desirable since, according to [12], almost 97% of typical service brake applications in commercial vehicles are made below 30 psig. The pneumatic subsystem is modeled so that the pressure transients in the brake chamber can be predicted from the measurements of the pedal force and pedal displacement.…”

Section: B Aim and Scope Of The Thesismentioning

confidence: 99%

“…7), we obtain, Let us now consider the variation of the brake chamber volume as a function of time during the brake application. At the start of the application, the brake chamber diaphragm starts to move only after the required "push-out" pressure is reached [12]. This initial increase in pressure is utilized in overcoming the pre-loads of the brake chamber return spring and the return spring in the brake drum.…”

Section: Fig 6 the Simplified Pneumatic Systemmentioning

confidence: 99%

Modeling the Pneumatic Subsystem of an S-cam Air Brake System

Journal of Dynamic Systems, Measurement, and Control

2004

This paper deals with the development of a fault-free model of the pneumatic subsystem of an air brake system that is used in commercial vehicles. Our objective is to use this model in brake control and diagnostic applications. The development of a diagnostic system would be useful in automating enforcement inspections and also in monitoring the condition of the brake system in real-time. This paper presents a detailed description of the development of this model and of the experimental setup used to corroborate this model for various realistic test runs.

Modeling the pneumatic subsystem of a s-cam air brake system

Proceedings of the 2003 American Control Conference, 2003.

The air brake system is one of the critical components in ensuring the safe operation of any commercial vehicle. This work is directed towards the development of a fault-free model of the pneumatic subsystem of the air brake system. This model can be used in brake control and diagnostic applications. Current enforcement inspections are done manually and hence are time consuming and subjective. The long-term objective is to develop a model-based, performance-based diagnostic system that will automate enforcement inspections and help in monitoring the condition of the air brake system. Such a diagnostic system can update the driver on the performance of the brake system during travel and with recent advancements in communication technology, this information can be remotely transferred to the brake inspection teams. Since this system is performance-based, it will eliminate the subjective nature of visual inspections. The first step in the development of such a diagnostic system is to obtain a fault-free model of the air brake system. The model of the pneumatic subsystem correlates the pressure transients in the brake chamber with the brake pedal actuation force and the brake valve plunger displacement. An experimental test bench was set up at Texas A&M University and the experimental data is used to corroborate the results obtained from the model.