Longitudinal Control for Automated Highway Vehicles

1982 ◽  
Vol 104 (2) ◽  
pp. 180-187 ◽  
Author(s):  
R. J. Caudill ◽  
P. Di Matteo ◽  
S. P. Thomas
Keyword(s):  
Control Systems ◽  
Internal Combustion Engines ◽  
Controller Design ◽  
Vehicle Control ◽  
Combustion Engines ◽  
Longitudinal Control ◽  
Model Reference Control ◽  
Control Concept ◽  
Simulation Results ◽  
Automated Highway

The problem of designing longitudinal control systems for automated highway vehicles powered by internal combustion engines is examined. Careful controller design is required so that the movement of freight and people may be achieved in the same roadway while maintaining stringent safety and operational standards. Individual vehicle control is achieved utilizing a modified proportional-error controller with switching boundaries. Longitudinal control of vehicle strings is based upon the model reference control concept. Analytical and computer simulation results indicate it is feasible to operate mixed vehicle strings.

Dynamic Emulation of Tire/Road Friction for Developing Electric Vehicle Control Systems

2009 ◽  
Author(s):  
Chengbin Ma
Keyword(s):  
Control Systems ◽  
Electric Vehicle ◽  
Electric Vehicles ◽  
Internal Combustion Engines ◽  
Transient Behavior ◽  
Vehicle Control ◽  
Friction Model ◽  
Combustion Engines ◽  
Road Friction ◽  
Dynamic Emulation

Current researches on electric vehicles are focusing on the environment and energy aspects. However, electric motors also have much better control performance than the internal combustion engines. Electric vehicles could not only be “cleaner” and “more energy efficient”, but also become “safer” with “better driving performance”. In this paper, a discrete elasto-plastic friction model is proposed for a dynamic emulation of tire/road friction for developing control systems of electric vehicles. The friction model can capture the transient behavior of the friction force during braking and acceleration, therefore the model-based emulation could enable more reliable verifications for various electric vehicle control methods.

A Global Approach to Vehicle Control: Coordination of Four Wheel Steering and Wheel Torques

1994 ◽  
Vol 116 (4) ◽  
pp. 659-667 ◽  
Author(s):  
Ssu-Hsin Yu ◽  
John J. Moskwa
Keyword(s):  
Control Systems ◽  
Controller Design ◽  
Sliding Mode ◽  
Vehicle Control ◽  
Point Of View ◽  
Sliding Mode Controller ◽  
Global Approach ◽  
Ground Vehicles ◽  
Advanced Control ◽  
Simulation Results

Currently, advanced control systems implemented on production ground vehicles have the goal of promoting maneuverability and stability. With proper coordination of steering and braking action, these goals may be achieved even when road conditions are severe. This paper considers the effect of steering and wheel torques on the dynamics of vehicular systems. Through the input-output linearization technique, the advantages of four-wheel steering (4WS) system and independent torques control are clear from a mathematical point of view. A sliding mode controller is also designed to modify driver’s steering and braking commands to enhance maneuverability and safety. Simulation results show the maneuverability and safety are improved. Although the controller design is based on a four-wheel steering vehicle, the algorithm can also be applied to vehicles of different configurations with slight changes.

scholarly journals Integration of kinematic and dynamic mathematical models of a two-axle electric car in the problem of estimating its stability on turns

ScienceRise ◽  
2021 ◽  
pp. 23-29
Author(s):  
Vadym Horeniuk
Keyword(s):  
Mathematical Models ◽  
Control Systems ◽  
Electric Drive ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Combustion Engines ◽  
The Road ◽  
On The Road ◽  
The Stability ◽  
Technological Product

Object of research: the process of movement of cars with internal combustion engines or the electric drive on a road curve. Investigation problem: assessment of the stability of cars with internal combustion engines or electric drive on a road curve and determination of conditions of its ensuring. The main scientific result. The article evaluated the stability of cars with internal combustion engines or electric drive on a road curve and determines the conditions of its ensuring using an algorithm that combines mathematical models of car movement on a road curve, synthesized based on balance equations of both kinematics and dynamics. The proposed models consider the change in speed of cars while driving on a road curve, and therefore belong to the class of differential equations. The analysis of these models allows calculating changes in time of values of limiting and critical speeds of movement of the car on a road curve. The article identifies the prospects of integration into this set of mathematical models another one, synthesized in the space of linguistic variables that characterize the uncertainty of the road surface and the degree of tire wear on different wheels of the car. The area of practical application of the research results: Automotive enterprises specializing in equipping cars with traffic control systems. Innovative technological product: A method of determining the limiting parameters of movement of the car on road curves, at which the car does not overturn while passing turns, and an algorithm for its implementation, which combines kinematic and dynamic mathematical models of car movement on the road curve. Scope of application of the innovative technological product: Equipping cars with additional control systems that assess the critical values of the traffic parameters on turns to ensure the conditions of non-overturning when the car passes these turns

A New Approach to Reduce Engine-Out Emissions Enabled by Trajectory-Based Combustion Control

2015 ◽  
Author(s):  
Chen Zhang ◽  
Zongxuan Sun
Keyword(s):  
Internal Combustion Engines ◽  
Control Method ◽  
Nox Emissions ◽  
Combustion Engines ◽  
Combustion Control ◽  
Ignition Timing ◽  
Free Piston ◽  
New Approach ◽  
Convective Heat Loss ◽  
Simulation Results

Previously, the authors have proposed the concept of piston trajectory-based combustion control enabled by free piston engines (FPE). With this novel control method, the FPE realizes in-cycle real-time combustion control, in terms of adjusting the ignition timing and manipulating the in-cylinder temperature trace, through various piston trajectories and achieves higher thermal efficiency compared to the conventional internal combustion engines. In this paper, the effects of this new combustion control on engine-out emissions are studied. First, a model is developed that includes different piston trajectories in the FPE, a convective heat loss sub model and a reduced n-heptane reaction mechanism with major emissions species from diesel engines. Afterwards, a new approach which reduces the engine-out emissions by employing novel piston trajectories is described. At last, analyses of the simulation results demonstrating the variable piston trajectories’ effects on CO and NOx emissions are presented, which further reveal the advantages of the trajectory-based combustion control.

scholarly journals Innovative research method of the fuel injector that allows to evaluate the efficiency of wood chip drive control systems

2019 ◽  
Vol 254 ◽  
pp. 01010 ◽  
Author(s):  
Łukasz Wargula ◽  
Piotr Krawiec ◽  
Konrad Jan Waluś
Keyword(s):  
Control Systems ◽  
Green Infrastructure ◽  
Research Method ◽  
Internal Combustion Engines ◽  
Wood Chip ◽  
Internal Combustion ◽  
Injection System ◽  
Combustion Engines ◽  
Fuel Injector ◽  
Innovative Research

Exceeding air pollution emission standards in large cities leads to a search of methods of reducing emissions and their neutralization. One of the ways to improve air quality is to increase green infrastructure in urban areas. It leads to an increase in the demand for work machines that process waste from tree care is. Mobile chopping shredders for tree branches are driven by internal combustion engines defined in the standard as drives of non-road mobile machines. In the case of spark-ignition internal combustion engines, these provisions are liberal. This leads to a low level of technical advancement of these drives characterized mainly by the carburettor fuel supply system. The article presents an innovative research method of the fuel injector of the injection unit, enabling mechatronisation of the combustion engine's injection system. The measured values make it possible to evaluate the fuel consumption depending on the developed (patent pending) innovative control systems for the chipper drive. Ultimately, the conducted research will enable the increase of the effectiveness of wood chipping grinding processes and reduction of harmful emissions.

Human Factors and the Automated Highway System

1992 ◽  
Vol 36 (15) ◽  
pp. 1064-1067 ◽  
Author(s):  
Elizabeth Alicandri ◽  
M. Joseph Moyer
Keyword(s):  
Human Factors ◽  
Control Systems ◽  
Vehicle Control ◽  
Intelligent Vehicle ◽  
Department Of Transportation ◽  
Automated Vehicle ◽  
Automated Highway ◽  
Automated Vehicle Control ◽  
Transportation Program ◽  
Highway System

The Intelligent Vehicle-Highway System (IVHS) is an important and broad ranging Department of Transportation program to reduce congestion and increase safety on the nation's highway system. The Automated Highway System (AHS) represents the full realization of one IVHS subsystem, Automated Vehicle Control Systems. Efforts are underway to define and resolve critical human factors questions related to the AHS. As part of the process, human factors issues will be identified through development of hypothetical AHS scenarios. This requires a generic AHS scenario be presented, and affiliated human factors issues identified.

scholarly journals Analysis of the possibilities of using of DME fuel in motor boat drive systems

2017 ◽  
Vol 171 (4) ◽  
pp. 74-80
Author(s):  
Jacek KROPIWNICKI ◽  
Przemysław DOMINICZAK ◽  
Zbigniew KNEBA ◽  
Sławomir MAKOWSKI ◽  
Janusz CIEŚLIŃSKI ◽  
...  
Keyword(s):  
Control Systems ◽  
Dimethyl Ether ◽  
Internal Combustion Engines ◽  
Combustion Engines ◽  
Toxic Compounds ◽  
Small Vessels ◽  
Reduce Emissions ◽  
Drive Systems ◽  
And Control ◽  
Gas Supply

The characteristics of alternative fuel for diesel: dimethyl ether (DME) and an analysis of the potential to reduce emissions of toxic compounds by the engines when running on this fuel have been presented in this work. Basic types of design solutions of gas supply and control systems, possible for use in internal combustion engines with DME supply have been also presented. The paper presents a study of the legislation and an analysis of the feasibility of the system storage and fueling DME on board small vessels.

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