Design of a pressure modulator using fast-acting bistable valves

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jats:p Fast-acting pneumatic valves, combined with a slip-control braking algorithm, have recently been used to improve the straight-line braking performance of an experimental heavy goods vehicle, on low friction roads, by 16%. This paper describes how the fast-acting valves, which were central to the aforementioned research, were designed for use on a commercial vehicle. Design equations, as well as a generalized design method, are first presented for the fast-acting bistable pneumatic valve. A pressure observer is developed to predict the brake chamber pressure in cases where a pressure transducer is mounted upstream. A simple fault detection algorithm is then introduced, which utilizes some of the calculations made in the pressure observer, and is shown to correctly identify faults on a real vehicle. Performance comparisons are made between the new modulator and a conventional heavy goods vehicle electro-pneumatic brake system. Closed-loop frequency response tests show that the control bandwidth of brake chamber pressure on a heavy goods vehicle can be increased from 1.5 Hz to 10 Hz using the new hardware. </jats:p>

Solenoid valve, pneumatic, antilock braking system, electronic braking system, slip control, magnetic modeling, brake system design, heavy vehicle
Journal Title
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
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SAGE Publications
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Cambridge Vehicle Dynamics Consortium