Vehicle Bus Research Articles

A Dynamic Response Analysis of Vehicle Suspension System

Automotive engineering is a very important branch of design and development in mechanical engineering devoted to vehicle manufacturing. It demands solid knowledge focusing on the kinematics and dynamics of mechanical systems, either using structural analysis or modelling techniques. In this manuscript, a model based on the application of the fundamentals of the static and dynamic behaviour of the suspension system of a bus vehicle is developed. Therefore, a set of mathematical equations is expanded following the structural dynamic formulations to obtain an analytical solution on natural frequencies and the displacement under an external load. The problem is also solved using the Finite Element Method (FEM) to confirm the analytical results. Equivalent material parameters and boundary conditions were used for the FEM simulation. This work aims to propose a methodology based on modal analysis with a simplified model to predict the dynamic response of an automotive structure.

Deep Q‐Learning Network Model for Optimizing Transit Bus Priority at Multiphase Traffic Signal Controlled Intersection

When multiple bus vehicles send priority requests at a single intersection, the existing fixed‐phase sequence control methods cannot provide priority traffic request services for multiphase bus vehicles. In view of the conflict of multiphase bus priority requests at intersections, the priority vehicle traffic sequence is determined, which is the focus of this study. In this paper, a connected vehicle‐enabled transit signal priority system (CV‐TSPS) has been proposed, which uses vehicle‐infrastructure communication function (V2I) technology to obtain real‐time vehicle movement, road traffic states, and traffic signal light phase information. By developing a deep Q‐learning neural network (DQNN), especially for optimizing traffic signal control strategy, the public transit vehicles will be prioritized to improve their travel efficiency, while the overall delay of road traffic flow will be balanced to ensure the safe and orderly passage of intersections. In order to verify the validity of the model, the SUMO traffic analysis software has been applied to simulate real‐time traffic control, and the experimental results show that compared with the traditional timing signal control, the loss time of vehicles is reduced by nearly 40%, and the cumulative loss time per capita is reduced by nearly 43.5%, and a good control effect is achieved. In the case of medium and low densities, it is better than the solid scheduled traffic control scheme.

Optimization design of real-time scheduling scheme for city bus vehicles based on BP neural network

Urban public transportation is inseparably related to people’s travel and life. Prioritizing the development of public transportation is a major national policy proposed by the Chinese government, especially to actively promote the development of intelligent public transportation systems. Developing and building advanced intelligent public transport operation and scheduling management system, designing efficient, flexible and low-cost operation and scheduling mode, improving the management level and service quality of public transport enterprises, and thus improving the road traffic condition of the whole city, is undoubtedly the future development direction of public transport enterprises. This paper combines the problems of bus operation and scheduling in China at the present stage, and proposes the operation and scheduling model and method of the intelligent urban public transportation planning system, with a view to realizing a flexible public transportation operation model suitable for different service situations and providing systematic theoretical support for solving the imbalance between supply and demand of public transportation.

Analisis Kelayakan Finansial Pengoperasian Bus Trans Metro Dewata di Provinsi Bali

Population growth that continues to increase and the ease of purchasing private cars is one factor in the increase in the number of private car owners. The government is here to change public transport services in the regions, including by operating the Trans Metro Dewata Bus in four corridors within the Sarbagita area. For now, the amount of vehicle operating costs (BOK) and operating income obtained from the operation of the Trans Metro Dewata Bus are unknown. This needs to be investigated further, especially in terms of financial feasibility. Based on the results of the study, assuming the bus fleet from the government, the total operational costs of Trans Metro Dewata Bus vehicles from 2023 - 2029, amounting to Rp.282,256,543,602. Assuming the bus fleet from the operator, the total operational cost of Trans Metro Dewata Bus vehicles from 2023 – 2029 is Rp. 391,744,920,721. The operating income based on the buy the service scheme from 2023-2029 is Rp. 366,173,491,600, while operating income based on the Tariff of Governor Regulation No. 112 of 2018 from 2023-2029 is Rp. 67,495,948,574. Based on the tariff according to Governor Regulation No. 112 of 2018 the operation of the Trans Metro Dewata Bus is not financially feasible.

50 percentile dummy movement analysis using TEMA Automotive software

The dynamic loads acting on passengers during road accidents depend not only on the vehicle structure, but also on the properties of the applied passenger and driver protection system. Two-point seat belts are the most frequently used personal protection system for adult passengers in bus vehicles. The paper investigates the thread of dynamic loads acting on the body of a 50 percentile dummy placed in an armchair equipped with two-point seat belts. In order to solve this problem, tests recorded with the Phantom v310 camera were used, the object of which was the Hybrid II 50th dummy, and the recording of the tests was carried out for three different collision speeds. The article presents the results of the crash tests obtained with the use of the TEMA Automotive program. Crash test analysis showing the displacement of the head and upper torso of the dummy located in the limited space between the bus-type seats indicates that standard seat belts do not provide sufficient protection. The article indicates the basis for further research and improvement of the personal protection system of passengers transported in minibuses and buses.

Effective Intrusion Detection and Prevention for the Commercial Vehicle SAE J1939 CAN Bus

Detecting and preventing intrusions on in-vehicle buses is a topic of great importance which may have an even greater significance in the context of commercial vehicles that are liable for the security of the demanding tasks they carry, passengers or goods not least. In this respect, the SAE J1939 protocol, which is a CAN based higher-layer protocol for commercial vehicles, requires special attention due to the existence of both specific procedures in the standard, e.g., address claims and multi-frame transmissions, as well as due to sharp specifications regarding the content of messages which may facilitate the deployment of a more targeted intrusion detection system. Needless to say, most of the research works on CAN intrusion detection are treating in-vehicle traffic as black-box with no concerns over the actual meaning of the frames content. In this context, we pursue the development of a targeted solution for J1939 buses. We collect real-world traffic from a commercial vehicle bus, compliant to the J1939 standard, and make a comprehensive analysis of its structure and content. This allows us to design an effective intrusion prevention system that detects and eliminates in real-time all frames that were manipulated by an adversary by overriding them with error flags. To prove the correctness of our approach, we present results with a proof-of-concept implementation on high-end automotive-grade controllers.

Traffic Risk Assessment Based on Warning Data

To address the issues of insufficient danger excavation and long data collection period in traditional traffic risk assessment methods, this paper proposes a risk assessment method based on driver’s improper driving behavior and abnormal vehicle state warning data. Meanwhile, this paper analyses the built environment’s impact on traffic risk using the spatial econometric model. Firstly, a risk assessment system with the relative incidence of driver’s improper driving behavior (eye closure, yawn, and looking away) and abnormal vehicle state (rapid acceleration, rapid deceleration, and lane departure) warnings as assessment indicators is constructed. Then, the risk responsibility weights of each warning type were determined using the entropy weight method. The risk classification thresholds were determined based on the Gaussian Mixture Model algorithm. Finally, a spatial econometric model was used to quantify the impact of built environment factors characterized by Point of Interest (POI) data on regional traffic risk, with the results of risk class classification as the dependent variable. The data of bus vehicle warnings in Zhenjiang, Jiangsu Province, are employed as an example for validation. The geographic cell of 1 km × 1 km scale is applied as the basic risk assessment unit. The results show that the optimal risk classification threshold for road traffic risk levels I and II is 1.92, the accuracy rate of class classification is 79.3%; the optimal risk classification threshold for levels II and III is 0.75, and the accuracy rate of class classification is 83.4%. The number of residential areas, Point of Interest (POI) mixing degree, and bus stops were significantly and positively correlated with transit traffic risk. The study results provide references for developing customized accident prevention measures and the appropriate setting of urban supporting facilities.

Scheduling Synchronization for Overlapping Segments in Bus Lines: Speed Control and Green Extension Strategies

Overlapping bus lines are ubiquitous in bus networks, particularly in metropolitan areas. The overlapping of bus lines can provide convenience for passengers who wish to transfer. However, it also tends to cause bus bunching at overlapping segment stops. Moreover, overlapping of bus lines introduces additional complexity to the operation of bus systems. This study aimed to dispatch bus vehicles entering overlapping segments dynamically by adopting speed control and green light extension strategies. This ensures that transferring passengers experience less transfer waiting time and reduced bus bunching at overlapping segments. The proposed model considers environmental constraints on vehicle speed and the stochastic factors of passenger arrivals at a stop. Synchronization is maximized by controlling the speed of vehicles along a roadway and determining whether a green light extension strategy is enabled. The effectiveness of the proposed model was verified by applying it to a real overlapping segment in Harbin, China. The results demonstrate that the proposed model can more than double the opportunity for synchronization in overlapping segments while reducing bus bunching at the stops in overlapping segments.

Intelligent Accidental Detection and Prevention System for Car using Can FD Protocol

Controller Area Network with Flexible Data Rate (CAN FD) is a vehicle bus standard protocol designed especially for automotive application. By using CAN FD Bus protocol, ECUs (Electronic control units) of vehicles can communicate with each other. It is a high speed, bandwidth efficient network. In order to reduce point to point wiring harness in vehicle automation, CAN FD is suggested as a means for data communication within the vehicle environment. The benefits of CAN FD bus based network over traditional point to point schemes will offer increased flexibility and expandability for future technology insertions units. We have designed five nodes, 4-sensor nodes and 1-Bus monitor nodes. Sensor nodes and Bus monitor nodes are communicating with each other through CAN FD Bus. Bus monitor node collects all messages present on the CAN FD Bus and transmits to the PC by using the UART interface. The CAN FD monitor window is designed using Visual Studio.net which allows the time oriented buffering of CAN FD messages and visualization of the BUS data at the package level.

A novel control strategy in mitigating bus bunching: Utilizing real-time information

A variety of control mechanisms have been recommended to concentrate on the issue of bus bunching. However, the majority of existing measures focus on controlling the bus operation directly from the operator's perspective. This study, nevertheless, presents a novel control technique by providing passengers with real-time wait time information and degrees of in-vehicle congestion. Specifically, passengers are expected to use the given information to calculate the overall travel cost and, therefore, make decisions on whether boarding on the arriving bus or waiting for the next buses. In this way, bus service operators would reduce bus bunching by adjusting passengers' boarding choice behavior rather than controlling the bus vehicles directly. We propose a bus traffic propagation model to simulate the bus movements, through which several system performance metrics, such as the shortest vehicle spacing distribution and the average ridership per bus vehicle at each stop, can be evaluated for different bus bunching control measures. The numerical results show that providing in-vehicle congestion information is as effective as the schedule-based and headway-based control methods in achieving mitigation of bus bunching. Passengers on long trips are more inclined to wait for a few more shifts for a bus that is not very crowded. This study proposes a novel control strategy by offering passengers real-time information to serve as a supplement, never a substitute, to the existing control measures in mitigating bus bunching problems.

Simulation-Based Evacuation System for Large-Scale Urban Road Network Considering Traffic Conditions

In case of an emergency, it is necessary to consider the impact of all traffic conditions on implementing the evacuation program accurately and reliably because there are still some private vehicles running in the evacuation area. To tackle this issue, this paper presents a large-scale simulation-based evacuation system from multiple evacuation depots to multiple safety depots considering traffic conditions, including three parts: traffic conditions acquisition, evacuation path planning, and microsimulation evaluation. Firstly, the traffic conditions related to link travel time between two points are estimated by considering private vehicles running on the road network and the rescue bus vehicles participating in the evacuation. A multi-path choice model for a dynamic time-varying network is then proposed, which might solve the evacuation paths with the minimum of evacuation time. Experimental results show that the proposed method could have higher accuracy than the traditional static path planning, as well as higher computational efficiency than the dynamic algorithm. Finally, the variable cell transmission model (VCTM) is improved to deduce the characteristics of evacuation traffic flow under the estimated traffic conditions, which can be used to recognize the bottlenecks in the road network and re-optimize traffic control measurements. The contrastive analysis results showed that the improved VCTM is in good agreement with the operation results of the popular microscopic simulation software VISSIM.

Development of main functional modules for MVB and its application in rail transit

Abstract In this work, multi-function vehicle bus (MVB) controller-based Field Programmable Gate Array (FPGA) and MVB manager based on the real-time multitasking operating system were explored and developed. The function of the MVB controller data link layer was realised by using FPGA. The embedded real-time multitasking operating system uCOS-II was applied to the development of MVB manager’s processing data, device state management, message data and bus management function. The network consistency test was performed to validate data communication of MVB link layer control protocol and the management function of MVB manager; the equipment was shown to be compatible with each other and met the requirements of IEC61375-1.

Integrated Framework for Bus Timetabling and Scheduling in Multi-Line Operation Mode

Bus service is of great significance to urban residents. With the convergence of bus lines and the formation of bus hubs, a multi-line operation mode which can realize the centralized management of vehicles is applied to the daily bus service planning. To solve the bus service planning problem systematically in the multi-line operation mode, we propose an integrated framework for bus timetabling (TT) and vehicle scheduling (VS), which are the two fundamental processes of bus service planning. Firstly, the determination processes of TT and VS are correlated by constructing the multiple vehicles’ trip-link chains with departure time information to facilitate simultaneous optimization. Secondly, a multi-objective optimization model is constructed, which considers higher service quality and lower operating costs as objectives. Logic and operational rules are also considered as constraints to ensure the implementation of the solutions. Thirdly, we propose and implement a heuristic solution algorithm based on neighborhood search to achieve high-performance solutions. Finally, we validate the efficiency and effectiveness of our framework under the actual bus operation scenario in Chongqing, China. The Pareto frontier solutions are provided to bus operators as alternative operation schemes.

A Two-Stage Approach With a Departure Time Based Solution Representation for Electric Bus Vehicle Scheduling

Vehicle scheduling problem (VSP) in public transit refers to arranging a fleet of vehicles to make vehicles’ departure times coincide with the times in given bus timetables. It is vital for bus enterprises to ensure the service quality and save operational cost. Due to the limited driving range and charging requirements of electric vehicles, how to efficiently schedule electric vehicles is a challenging task with the popularization of electric bus vehicles. In this paper, we propose a two-stage solution approach (SA-LS) combining a simulated annealing (SA) and a local search (LS) for an electric vehicle scheduling problem (EVSP) in public transport. This approach is based on a novel solution coding that represents a scheduling solution by departure times of a fleet of vehicles. The decoding procedure considers limited driving range and recharging time of electric vehicles. The SA is used to find a set of solutions able to be potentially improved by LS. The LS combined with a departure-time adjustment procedure (DTAP) is devised to improve the solutions found by SA. Evaluation functions are devised separately for SA and LS to guide their search. The proposed approach is applied to real world vehicle scheduling problem of three bus lines in Qingdao city, China. Experiments show that SA-LS is able to generate high-quality scheduling solutions within short computational time.

MAN trolleybuses in Ukraine (1939–1951): a history, technical characteristics, features of operation

The growth of the vehicle assets and bus services in Ukrainian cities increases the level of environmental pollution. During the environmental crisis, electric transport (e-transport) is becoming a matter for scientific inquiry, a subject of discussion in politics and among public figures. In the program for developing the municipal services of Ukraine, priorities are given to the development of the infrastructure of ecological transport: trolleybuses, electric buses, electric cars. The increased attention to e-transport on the part of the scientific community, politicians, and the public actualizes the study of its history, development, features of operation, etc. The historiographic analysis carried out by the authors allows us to say about insufficient coverage by Ukrainian researchers of a number of aspects and periods in the history of e-transport. A small number of special works on the history of the operation of foreign-made trolleybuses in Ukrainian cities in the first half of the 20th century and an analysis of their technical characteristics determine the relevance and scientific novelty of this study. When writing the work, Ukrainian and foreign scientific reference publications, monographs, papers, mainly from foreign electronic resources, have been used. The authors have used both general scientific (analysis, synthesis, deduction, induction) and historical research methods, in particular, problem-chronological, comparative-historical, retrospective methods, etc. The aim of the study is to highlight little-known facts of the history of production and operation of MAN trolleybuses in Ukrainian cities, as well as to introduce their technical characteristics into scientific circulation. The etymology of the model names of German trolleybuses, which usually consisted of the names of the manufacturers of chassis, body, and electrical equipment, has been clarified. The types, specific design solutions of the first MAN trolleybus generation and the prerequisites for their appearance in Chernivtsi have been determined. Particular attention has been paid to trolleybuses that were in operation in Germany and other Western European countries from the first half of the 1930s to the early 1950s. In the mid-1930s, the MAN plant in Nuremberg began production of trolleybuses; its models had the most modern constructive solutions at that time, a characteristic design and a state-of-the-art heating system. Depending on the length, German manufacturers divided the trolleybus models into four types. As a result of problems with the operation of the bus fleet in Chernivtsi, the city authorities have decided to build a trolleybus line in the city; four trolleybuses manufactured by the MAN plant were purchased. The paper traces the stages of operation of the MAN trolleybuses in Chernivtsi, where they worked during 1939–1944 and after the end of the Second World War, they were transferred to Kyiv. After two years of operation in the Ukrainian capital, the trolleybuses entered the routes in Dnipropetrovsk during 1947–1951. The technical characteristics of the first MAN trolleybus generation, which were operated in Ukrainian cities, have been presented and analyzed. It was determined that in all the main indicators and operational parameters, they were as close as possible to similar models of German trolleybuses. The proposed methodology and the structure of the study can later be used to write papers on the history of science and technology, in particular, of an e-transport.

A force-driven model for passenger evacuation in bus fires

A generic evacuation model is developed based on the behavioral characteristics of passengers during bus fires. Inspired by hydrodynamic mechanisms, the proposed particle-based force-driven model is built using force analysis of evacuees and analogs the movement of people as fluid motion. Several modules are developed to characterize evacuees’ preferences for varying exits, aggregated behavior of groups, and effects of driver. The Smoothed Particle Hydrodynamics (SPH) methods are applied to solve the proposed model using smoothed kernel functions. Experiments are conducted to calibrate and validate the proposed model based on observed evacuees’ behavioral characteristics, such as evacuation time, evacuation speed under different scenarios in terms of bus capacity, and the interaction between evacuees. The results of the study will contribute to a better understanding of bus evacuation options, improved design of bus vehicles to cope with internal fires, and the development of appropriate policies and regulations for bus passenger evacuation in response to fires. The proposed method can also be readily applied to other related fields with minor modifications.

Response Time Analysis for Nonperiodic CAN Message Based on GI/G/1 Queue Model

Controller area network (CAN) has wide applications in modern industrial control systems. Automobile manufacturers use this communication protocol for vehicle control, which is subject to real-time and high-reliability performance. However, with the increasing actuators gathered in the vehicle, time delay will lead to a serious problem for the vehicle safety and performance control. Thus, the information transmission stability of the CAN message needs to be investigated. In order to find out the delay response time of nonperiodic CAN message in the vehicle bus area, the response of the message transmitted in the CAN bus is modeled based on the GI/G/1 queue theory. The test platform is developed to verify the methodology. In the experimental test, some conditions with different IDs, load ratios, and priorities are investigated. Experimental results are compared with the theoretical results, and the simulation results show that the method is valid and verify the real response delay time of nonperiodic CAN message.

Analysis of bus performance on the risk of traffic accidents in East Java-Indonesia

Bus transportation performance must be able to demonstrate safety performance capabilities, one of which is the condition of the vehicle. Therefore, to achieve bus vehicles' safety performance, research must be carried out to determine the causes of accidents. This study aims to determine the causes of accidents related to vehicle conditions. Some of the variables that are observed include brake, wheel, equipment, stability, and worthiness. The data collection method used is to collect secondary data on the incidence of accidents from each Resort Police Office in each district traversed by the intercity public bus route. The roads traversed by the public bus transportation routes between the cities that are the object of the study include Sidoarjo Regency, Pasuruan Regency, Probolinggo Regency, Mojokerto Regency, Madiun Regency, and Ngawi Regency. The analytical method to obtain mathematical modeling is to use Principal Component Analysis (PCA). The results show that five factors analyzed, four main actors, cause intercity bus accidents, namely brakes, wheels, stability, and worthiness. The four factors are interrelated with each other, where these factors support each other and trigger accidents and obtained a mathematical model of the factors causing the accident which can be explained by two mathematical equations, namely PC1=0.61X1+0.70X2+0.46X3+0.63X4+0.72X5 and PC2= 0.47X1 0.17X2+0.76X3 0.26X4+0.31X5. The study results also illustrate that accidents caused by an inappropriate wheel are always followed by a breakdown of the braking system that is not functioning properly, and the wheel system consisting of wheel and brake conditions will be a problem triggering the accident

The Influence of the Duration of Journey Stages on Transport Mode Choice: A Case Study in the City of Tarnow

In this paper, we present the effect of making too many private car journeys on city transport systems. A sustainable approach for the development of transport infrastructure is needed, which takes into account local conditions and needs, especially for areas with a high density of origins and destinations. The criteria for evaluating public transport and bicycle transport are presented, which, if acceptable to city residents, may lead to changes in transportation behaviors and, thus, a more efficient use of transport in daily travels. Factors affecting the mode of transport choice include the duration of particular stages of a journey, such as reaching the location where the first ride commences/driving from the travel origin, waiting for a vehicle (bus journeys) or ride/drive, and reaching the travel destination of the last ride/drive. Additionally, the possibility of using a car and having a seasonal ticket for public transport were taken into account. In this study, the results of detailed travel research in the Polish city of Tarnow were used. It has been proven that the low share of public transport in daily travels is due, among other things, to excessive time to reach a stop and due to walking to journey destinations, whereas the low share of cycling is mainly due to a lack of comfort and safe cycling infrastructure.

Formal Design of Multi-Function Vehicle Bus Controller

Data of the train communication network(TCN) is becoming more complicated, which results in higher requirements of the data processing unit-the multifunction vehicle bus controller (MVBC) connected within the TCN. Developing an MVBC is challenging because of the integrated hardware-software solutions to support reactions in real time and dynamic environment. Hence, there is an urgent need for a rigorous design framework to facilitate the development of MVBC. In this paper, we propose a design framework TooMVBC to generate executable MVBC code from formal verified computation model. TooMVBC uses formal computation model MVBChart to capture the specification of the MVBC at high level. First, primitive syntax of MVBChart is designed to model MVBC features (e.g. hierarchy structure, data flow of the encoder, the control logic of communication protocol), and semantics of MVBChart is formalized for simulation and verification. Then, semantics-preserving code generation algorithms are designed to generate VHDL code for partitioned hardware implementations and C code for partitioned software implementations from verified MVBChart model. The generated code can be loaded into the proposed flexible MVBC hardware architecture directly. Finally, supporting graphical model editor, simulator, verification translator, partitioning and code generator are implemented and seamlessly integrated into TooMVBC. When we apply TooMVBC to design MVBC with the highest class 5 according to the description of the standard IEC 61375, several critical ambiguousness or bugs in the standard are detected during formal verification of the constructed system model.