Title: Impact of a modified braking valve for static and dynamic characteristics of pneumatic braking systems of agricultural trailers
Authors: Zbigniew Kamiński; Krzysztof Kulikowski
Addresses: Faculty of Mechanical Engineering, Department of Machinery Design and Thermal Engineering, Bialystok University of Technology, ul. Wiejska 45C, 15-351 Białystok, Poland ' Faculty of Mechanical Engineering, Department of Machinery Design and Thermal Engineering, Bialystok University of Technology, ul. Wiejska 45C, 15-351 Białystok, Poland
Abstract: Pneumatic braking systems of agricultural trailers contain brake valves with adjustable predominance of the output pressure relative to the control pressure. The goals of our study were to improve the static and dynamic properties of agricultural trailer pneumatic braking systems by modification of brake valve construction with implementing a throttle valve to the predominance device in valve. Proposed correction device ensures that the intensity of the predominance effect depends on the rate of pressure rise in control chamber of the braking valve. Initial testing of three agricultural trailers' braking systems has confirmed the effect of modifying relay emergency valve to shortening the response time of their braking systems while maintaining a follow-up action under steady state conditions.
Keywords: braking dynamics; vehicle braking systems; road safety; air brake systems; agricultural trailers; relay emergency valve.
International Journal of Heavy Vehicle Systems, 2021 Vol.28 No.2, pp.291 - 307
Received: 21 Sep 2018
Accepted: 04 Feb 2019
Published online: 11 Jun 2021 *