Pressure control scheme for air brakes in commercial vehicles
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Air brake systems are widely used in commercial vehicles such as trucks, tractor-trailers and buses. In these brake systems, compressed air is used as the energy transmitting medium to actuate the foundation brakes mounted on the axles. Here, we present a control scheme for regulating the pressure of air in a brake chamber of these brake systems. This scheme is based on a non-linear model for predicting the pressure transients in the brake chamber that correlates the brake chamber pressure to the treadle valve (brake application valve) plunger displacement and the pressure of the air supplied to the brake system. The control scheme regulates the pressure in the brake chamber by modulating the displacement of the treadle valve plunger. We have implemented this control scheme on the brake testing facility at Texas A&M University and present results for a variety of test runs in which the controller tracks realistic desired pressure trajectories.
author list (cited authors)
Bowlin, C. L., Subramanian, S. C., Darbha, S., & Rajagopal, K. R.