Open AccessMethod of calculating the design parameters of a modulator anti-lock braking system with a high flow of working fluid
Author(s) -
Mikhail ZHILEVICH,
Sergey ERMILOV,
Denis Kapski,
Joško Lozić,
Оleg Lyashuk,
Iryna VOVK
Publication year - 2021
Publication title -
zeszyty naukowe - politechnika śląska. transport/scientific journal of silesian university of technology. series transport
Language(s) - English
Resource type - Journals
eISSN - 2450-1549
pISSN - 0209-3324
DOI - 10.20858/sjsutst.2021.110.16
Subject(s) - retarder , brake , flow (mathematics) , hydraulic fluid , dynamic braking , engineering , safety valve , engine braking , automotive engineering , control theory (sociology) , oil pressure , mechanical engineering , computer science , mechanics , physics , control (management) , artificial intelligence
The design dimensions of the executive hydraulic cylinders of the brake system of heavy-duty mining dump trucks cause high fluid flow during the braking process. Therefore, dimensions of the anti-blocking system modulator spool pair require unique electromagnets or hydraulic amplifiers to control. These solutions do not allow the required modulator performance. Thus, a modulator scheme with a division of the flow of fluid from the source to the brake cylinders was developed. This scheme allows during emergency braking passing, an additional amount of fluid to cylinders through the valve, installed parallel to the main valve upon pressure increase phase and controlled by the pressure difference. The task is to develop a method for calculating the main structural dimensions of a modulator. The calculation of the valve of the second cascade, installed in parallel to the main stage, is carried out for the emergency braking mode with the maximum flow rate to ensure the required performance of the braking system. The balance of fluid flows equations is compiled at the key points. The flow rate of the fluid through each of the valves is determined by the Torricelli formula, and the pressure difference across the valves is assuned equal. The obtained relations allows building a family of Q-p curves, which can be used to select the diameter and stroke of the additional valve depending on the flow rate in the brake system.