Abstract
Too low an operating speed of trailer air braking systems may lead to an inhibition of the braking asynchrony of agricultural tractor trailer units. Improved braking dynamics advanced braking systems with an electronic control unit (e.g. Trailer EBS) provide a more rational solution for high speed agricultural vehicles. In this paper, an overview of other methods for developing the dynamic properties of air braking systems for agricultural trailers is described. This paper provides an examples of braking system design parameters optimization, using a variety of accelerating valves and dynamic properties correcting devises, also as well, by using simple systems with an electronic controllers. The described methods of dynamic properties improvements can be used to improve the speed and operation synchrony of the air braking systems of low-speed agricultural trailers. The paper presents the influence of some of the described methods, with different levels of complexity, on the properties of typical air braking systems.
Highlights
In many EU countries, farm trailers and towed machines with air brake systems supplied and controlled by the tractor’s pneumatic systems are used
At work [10] an electro-pneumatic proportional valve was proposed to replace the Anti-lock braking system (ABS) (Anti-lock Brake System) so as to control the brake pressure more accurately, but the reason why it has been rarely used in vehicles is their high cost
This paper describes various methods of shaping the dynamic properties of agricultural trailer air braking systems, including the optimization of their design parameters, the use of different brake valves with dynamic properties correcting devices, as well as the use of simple systems with an electronic controller
Summary
In many EU countries, farm trailers and towed machines with air brake systems supplied and controlled by the tractor’s pneumatic systems are used. From research [28] it is known, that even small differences in threshold pressures (the brake pressure at which the brakes just begin to operate) between the towing and the towed vehicles, which are well within the limits currently set by legislation, may cause rapid lining wear, an imbalance and a drop in braking performance For this reason, trailer braking systems use relay emergency valves with an predominance device [6], [11], [29], which is able to produce a positive pressure at the valve outlet port, being adjustable in the range from 0 to approximately 1 bar. This paper describes various methods of shaping the dynamic properties of agricultural trailer air braking systems, including the optimization of their design parameters, the use of different brake valves with dynamic properties correcting devices, as well as the use of simple systems with an electronic controller. As corrective devices, typical dynamic units are used, such as: an aperiodic unit of the first order, or an integrating or differentiating unit
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