scholarly journals Blending Control of Trolleybus Traction and Brake Drives to Enhance Braking Efficiency of Vehicle

2021 ◽  
Vol 20 (2) ◽  
pp. 132-141
Author(s):  
A. I. Safonau
Keyword(s):  
Mathematical Model ◽  
Electric Motor ◽  
Public Transport ◽  
Road Traffic ◽  
Brake System ◽  
Electric Transport ◽  
Braking System ◽  
Promising Tool ◽  
Braking Process ◽  
Traction Electric Motor

The widespread use of green public transport is a priority strategy to reduce a congestion and pollution from road traffic in many cities. The trolleybus is a type of urban public electric transport, which is considered as a promising tool for  increasing the efficiency of public transport and achieving the goals of sustainable development and quality of life in the city. The operation control of service brake system and secondary brake system (braking torque of traction electric motor) is realized with the help of one pedal in the trolleybus. Thus, there are modes of joint operation for these systems during the braking process. The author has focused his main attention on the development of an algorithm for blending control of the traction electric motor and the anti-lock braking system to enhance the overall braking efficiency of a vehicle. For this purpose, a mathematical model of the trolleybus braking dynamics has been developed. Bench and road tests have been carried out on various road surfaces to determine parameters of vehicle braking efficiency and to validate the developed mathematical model. The corresponding experimental data were used to analyse the efficiency of the proposed strategy for combining the blending control of traction electric motor and anti-lock braking system of the trolleybus. As a result, the efficiency of the proposed control algorithm has been confirmed, which provides the required braking efficiency and high braking stability of the vehicle. 

scholarly journals AGV Brake System Simulation

2019 ◽  
Vol 10 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Daniel Varecha ◽  
Robert Kohar ◽  
Frantisek Brumercik
Keyword(s):  
Mathematical Model ◽  
Input Data ◽  
Initial Conditions ◽  
Brake System ◽  
Disc Brake ◽  
Hydraulic Control ◽  
Stopping Distance ◽  
Braking Force ◽  
Braking Process ◽  
The Mathematical Model

Abstract The article is focused on braking simulation of automated guided vehicle (AGV). The brake system is used with a disc brake and with hydraulic control. In the first step, the formula necessary for braking force at the start of braking is derived. The stopping distance is 1.5 meters. Subsequently, a mathematical model of braking is created into which the formula of the necessary braking force is applied. The mathematical model represents a motion equation that is solved in the software Matlab by an approximation method. Next a simulation is created using Matlab software and the data of simulation are displayed in the graph. The transport speed of the vehicle is 1 〖m.s〗^(-1) and the weight of the vehicle is 6000 kg including load. The aim of this article is to determine the braking time of the device depending from the input data entered, which represent the initial conditions of the braking process.

scholarly journals Studi Eksperimental Analisa Kinematik Pengereman Mobil

2018 ◽  
Vol 1 (2) ◽  
pp. 171-180
Author(s):  
Muhammad Sabri ◽  
Ardhian Fauza
Keyword(s):  
Brake System ◽  
Large Role ◽  
Kinematic Parameters ◽  
Braking System ◽  
Before And After ◽  
The Difference ◽  
Braking Process

Penelitian ini bertujuan untukmenemukan hubungan keterikatan antara parameter utama kinematik yang terdapat pada proses pengereman yaitu gaya, jarak dan waktu pada proses pengereman. Perbedaan pola dan karakteristik dari proses pengereman pada kendaraan dinilai sangat penting untuk diketahui disebabkan sistem rem merupakan sistem yang mempunyai peran besar terhadap keamanan dalam berkendara. Yang kemudian hasil penelitian menunjukan bahwa parameter gaya berbanding terbalik terhadap jarak dan waktu pengereman ( gaya >< jarak dan waktu). Sehingga kesimpulan utama dari hasil penelitian adalah karateristik pada proses pengereman mempunyai kecenderungan yang tidak jauh berbeda tetapi memiliki perubahan jarak dan waktu pengereman yang dapat berubah ubah pada setiap variasi gaya yang diberikan pada saat sebelum dan setelah sistem rem pada kendaraan diperbaiki. This study aims to find relationship amongst the main kinematic parameters in braking process, namely force, distance and time. The difference in patterns and characteristics of braking process of vehicles is considered very important to know because braking system constitutes a system that has a large role in safety driving. The results of the study showed the force parameters were inversely proportional to the distance and braking time (force > <distance and time). Therefore, the main conclusion of the study was the characteristics of braking process had a tendency which was not much different but gave a change in distance and braking time which could be different in each variation of force before and after the brake system in repaired vehicles.

scholarly journals Method of calculating the design parameters of a modulator anti-lock braking system with a high flow of working fluid

2021 ◽  
Vol 110 ◽  
pp. 199-210
Author(s):  
Mikhail ZHILEVICH ◽  
Sergey ERMILOV ◽  
Denis KAPSKI ◽  
Yuriy VOVK ◽  
Oleg LYASHUK ◽  
...  
Keyword(s):  
Flow Rate ◽  
Pressure Difference ◽  
Maximum Flow ◽  
Brake System ◽  
Design Parameters ◽  
Working Fluid ◽  
Main Stage ◽  
Emergency Braking ◽  
Braking System ◽  
Braking Process

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.

Vibrostability Peculiarities of Disk Brake in Automobile Anti-Lock Braking System

2005 ◽  
Author(s):  
A. K. Pogosian ◽  
A. O. Bakhshyan ◽  
A. A. Tamrazov
Keyword(s):  
Mathematical Model ◽  
Calculation Method ◽  
Brake Pads ◽  
Disk Brake ◽  
Braking System ◽  
Oscillation Process ◽  
Braking Process ◽  
System Disk ◽  
The Impact ◽  
Braking Dynamics

On the basis of the automobile braking mathematical model describing brake pads oscillation process taking into account the influence of anti-lock braking system, disk brake vibrostability calculation method is worked out. As a result the algorithm of differential equations solving that describe the dynamics of automobile braking process is proposed. Considered model of braking dynamics establish interaction between braking and tire-road coupling moments. The calculations of disk brake vibrostability taking into consideration the impact of anti-lock braking system action are carried out.

scholarly journals FEATURES OF ADAPTIVE BRAKE CONTROL OF THE SECONDARY BRAKE SYSTEM OF A MULTI-AXLE VEHICLE

2021 ◽  
pp. 27-37
Author(s):  
Viktor Bogomolov ◽  
Valeriy Klimenko ◽  
Dmytro Leontiev ◽  
Oleksandr Kuripka ◽  
Andrii Frolov ◽  
...  
Keyword(s):  
Simulation Model ◽  
Road Safety ◽  
Road Surface ◽  
Brake System ◽  
Technical Literature ◽  
Adhesion Properties ◽  
The Road ◽  
Emergency Braking ◽  
Braking System ◽  
Braking Process

Problem. A malfunction of the service braking system of a wheeled vehicle (CTS) significantly affects road safety, especially when operating multi-axle vehicles with large masses. One of the ways to increase the level of road safety of multi-axle vehicles, when braking them using a spare (emergency) braking system, is the introduction of automated adaptive braking systems into the design of the brake drive of vehicles. The definition of the limits of the use of the adaptive braking system on vehicles with many axles is almost not disclosed in the scientific and technical literature, therefore, the issue of using such a system on vehicles with a large number of axles requires additional research. Purpose. The purpose of this work is to develop a simulation model for adaptive control of the braking process of a multi-axle vehicle using a spare (emergency) braking system, taking into account the simulation of the dynamics of the drive and the variability of the adhesion properties between the tire of the vehicle wheel and the road surface. Methodology. To achieve this goal, it is necessary to develop a simulation model of the brake drive in an adaptive mode, implement a model of the interaction of the tire with the road surface, and implement a model of the braking dynamics of a multi-axle vehicle in the event of a malfunction of its service brake system. Originality. The proposed key criterion (Kr) for changing the throttle section in electro-pneumatic pressure modulators, which provide adaptive air inlet or outlet from the corresponding brake chambers of the drive, during simulation, made it possible to simulate the operation of the drive circuits in the adaptive mode. It has been established that, depending on the potential for the realization of the adhesion between the tires of automobile wheels and the road surface, the pressure in the electro-pneumatic brake drive with its adaptive regulation can be increased by no more than 0.04 MPa.

scholarly journals Influence of the Braking System that is Contrary to Legislation on Breaking Characteristics of Passenger Car

2018 ◽  
Vol 14 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Tomáš Skrúcaný ◽  
František Synák ◽  
Štefánia Semanová
Keyword(s):  
Road Traffic ◽  
Negative Impact ◽  
Front Axle ◽  
Brake System ◽  
Motor Vehicles ◽  
Active Safety ◽  
Brake Disc ◽  
Braking System ◽  
Braking Distance ◽  
The Mean

Abstract There are also the vehicles among the other vehicles in road traffic that have been modified without being authorised by their producer. These also include modifications such as structural modifications in the vehicle break system. Besides a brake system of road motor vehicles is one of the main factors influencing the active safety of vehicles. The design of the brake system, its technical condition and additional intervention in its construction may have a positive as well as negative impact on the braking distance length and the value of the mean braking deceleration achieved. The paper focuses on the influence of the brake disc diameter of the front axle on the achieved value of the mean braking deceleration and the braking distance length, while the braking system has been modified for several times without being approved by car manufacturer. The introductory part of the paper describes the braking distance sections and it also explains the term of mean braking deceleration. The following part of the paper deals with the measurement methodology, measuring equipment and the vehicle used during the measurements as well as procedures employed. The results obtained from the measurements are processed and presented in tables and also in graphs for greater clarity. The final part of the paper summarizes and evaluates the measured results. The importance of the paper lies in quantification of the influence of brake discs with different diameters on the vehicle active safety in the case of a particular vehicle.

Simulation Analysis of Portal Crane Braking Effect with Dual-Stage Brakes under Fluctuating Wind Load

2014 ◽  
Vol 607 ◽  
pp. 268-272
Author(s):  
Guang Wei Qing ◽  
Hui Jin ◽  
Jing Bo Hu
Keyword(s):  
Simulation Analysis ◽  
Brake System ◽  
Safety Device ◽  
Braking Performance ◽  
Braking System ◽  
Dual Stage ◽  
Braking Force ◽  
Braking Process ◽  
Fluctuating Wind ◽  
Portal Crane

In order to grasp the braking effect of the portal crane after the installation of auxiliary wind safety device, the braking process of real harbor crane with dual-stage windproof braking system exposed to fluctuating wind is simulated. The effect on the crane braking performance of braking device response lag and artificially lowering working braking force is also analyzed. It is demonstrated that the dual-stage brake system is superior to the single and could improve the windproof ability when working braking force decline.

TO THE STABILITY OF TANK VEHICLES IN THE BRAKE MODE

2019 ◽  
pp. 27-32
Author(s):  
Denys Popelysh ◽  
Yurii Seluk ◽  
Sergyi Tomchuk
Keyword(s):  
Mathematical Model ◽  
Control Systems ◽  
Distribution Systems ◽  
Traffic Accidents ◽  
Road Traffic ◽  
Center Of Mass ◽  
Dynamic Processes ◽  
Course Stability ◽  
The Stability ◽  
Tank Vehicles

This article discusses the question of the possibility of improving the roll stability of partially filled tank vehicles while braking. We consider the dangers associated with partially filled tank vehicles. We give examples of the severe consequences of road traffic accidents that have occurred with tank vehicles carrying dangerous goods. We conducted an analysis of the dynamic processes of fluid flow in the tank and their influence on the basic parameters of the stability of vehicle. When transporting a partially filled tank due to the comparability of the mass of the empty tank with the mass of the fluid being transported, the dynamic qualities of the vehicle change so that they differ significantly from the dynamic characteristics of other vehicles. Due to large displacements of the center of mass of cargo in the tank there are additional loads that act vehicle and significantly reduce the course stability and the drivability. We consider the dynamics of liquid sloshing in moving containers, and give examples of building a mechanical model of an oscillating fluid in a tank and a mathematical model of a vehicle with a tank. We also considered the method of improving the vehicle’s stability, which is based on the prediction of the moment of action and the nature of the dynamic processes of liquid cargo and the implementation of preventive actions by executive mechanisms. Modern automated control systems (anti-lock brake system, anti-slip control systems, stabilization systems, braking forces distribution systems, floor level systems, etc.) use a certain list of elements for collecting necessary parameters and actuators for their work. This gives the ability to influence the course stability properties without interfering with the design of the vehicle only by making changes to the software of these systems. Keywords: tank vehicle, roll stability, mathematical model, vehicle control systems.

Refined thermal calculation of the locomotive heat engine collector

2020 ◽  
pp. 56-58
Author(s):  
P.V. Gubarev ◽  
D.V. Glazunov ◽  
V.G. Ruban ◽  
A.S. Shapshal
Keyword(s):  
Experimental Data ◽  
Electric Motor ◽  
Heat Balance ◽  
Thermal Imaging ◽  
Heat Engine ◽  
Thermal Calculation ◽  
Calculation Results ◽  
Cooling Air ◽  
The Heat Balance ◽  
Traction Electric Motor

The thermal calculation of the locomotive traction engine collector is proposed. The equations of the heat balance of its elements are obtained taking into account the cooling air. The calculation results and experimental data of thermal imaging control are presented. Keywords: traction electric motor, collector, thermal calculation, thermal imaging control. [email protected]

Plastic deformation of collector plates at electric motor repair

2020 ◽  
pp. 79-82
Author(s):  
D.YU. Belan ◽  
G.B. Toder ◽  
K.V. Averkov ◽  
YU.V. Titov
Keyword(s):  
Plastic Deformation ◽  
Electric Motor ◽  
Roughness Parameter ◽  
Surface Plastic Deformation ◽  
Analytical Dependence ◽  
Surface Plastic ◽  
Machined Surface ◽  
Tool Surface ◽  
Diamond Burnishing ◽  
Traction Electric Motor

A tool was developed for smoothing the plates of an electric motor collector. An analytical dependence of the roughness parameter of the machined surface on the force applied to the tool is obtained. Keywords traction electric motor, collector, diamond burnishing tool, surface-plastic deformation, repair, roughness. [email protected]

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