The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
HDVs rollovers cost hundreds of million dollars every year, the risk of having dead people in accidents involving HDVs is multiplied by 2.4 in comparison to the same risk computed for accidents involving light vehicles. Wind has been shown to be an important factor that must be considered when investigating HDVs rollover. In order to address these concerns, this research built an aerodynamic and vehicle...
With the recent advancement of control method and battery technology, the electric vehicle has been researched to replace the conventional vehicle with electric vehicle with the view point of the environmental concerns and energy conservation. An electric vehicle which is equipped with the in-wheel motors has some advantages in terms of control. For example, the different torque which generated by...
In Steer Release condition, due to the ability of actual vehicle to resist external small perturbations and self-Adaptive coordination can't be described in the previous vehicle model, the stability of vehicle is described insufficiently. A fine steering system model was established, including Stick-slip friction model and a complete dynamic system consist of wheels, axles, steering tie rod and rack...
A 2DOF reference model of heavy single tractor was set up using the yaw rate and the lateral acceleration as control variables based on analysis of tractor instability mechanism. The reference model of tractor was simulation controlled using allocation strategy of braking moment and control strategy of slip ratio with PD algorithm for typical fishhook steering in Trucksim. The simulation results show...
This paper proposes a new ABS (Anti-lock Braking System) control strategy based on braking time interval by analysis and simulation of braking process. Braking strength is an important influence factor of safety braking. In the whole braking process, with the change of braking time interval, the average braking force changes, and the strategy adapts to the need of braking strength in different road...
Vehicle is a complex uncertain system with parameter perturbations and external disturbances; these uncertainties will easily result in the loss of vehicle driving stability. Tire cornering stiffness is a key influencing factor on maneuverability of vehicle. In order to maintain driving stability in vehicle cornering, through regarding tire cornering stiffness and outer disturbances as bounded uncertain...
The BTT flight control system design is researched and established for flight vehicle control mathematical model, control gain solution and mathematical simulation. Firstly, the design of BTT flight control system is put forward, and then a linear controller is designed with fuzzy control theory. Secondly, the flight vehicle's characteristic is analyzed, and the disturbance model is set up. The Frequency-domain...
Electric Power Steering (EPS) systems have many merits over traditional hydraulic power steering systems in fuel economy, variable assist capabilities and favorable road feeling by virtue of adjustment assist characteristic with adopting assist motor in replacement of hydraulic pump. This paper aims at modeling the mechanical parts, the assist motor and electronic control unit by bond graph technique...
In this paper, we propose a yaw moment control based on fuzzy-logic controller to enhance the vehicle stability. A two-degree-of-freedom nonlinear model of the considered vehicle is briefly presented. The feedback of the yaw rate and sideslip angle are regarded as inputs of the controller. The developed controller generates the suitable steering angle so that the vehicle follows the target values...
This paper is about modeling and control of Miniature Aerial Vehicles -MAVs for indoor scenarios, specially using, micro coaxial and quadrotor systems. Mathematical models for simulation and control are introduced and subsequently applied to the commercial aircraft: the DraganFlyer quadrotor and the Micro-Mosquito coaxial flying vehicle. The MAVs have been hardware-modified in order to perform experimental...
Deflexion-angle is a crucial parameter for automobile controlling stability and safety. For constructing the basement of deflexion-angle detection, the model of semi-trailer train's suspension is built and leaf spring dependent suspension is replaced with helical spring dependent suspension in the model. Balance suspension is adopted to distribute axle load uniformly. The mainly measuring parameters...
Deflexion-angle is a crucial parameter for automobile controlling stability and safety. For constructing the basement of deflexion-angle detection, the model of semi-trailer train's suspension is built and leaf spring dependent suspension is replaced with helical spring dependent suspension in the model. Balance suspension is adopted to distribute axle load uniformly. The mainly measuring parameters...
Based on the six-freedom-degree model of four-wheel-drive electric vehicles, the fail-safe problem of (Electric Power Steering system) EPS is analyzed, and an EPS fail-safe strategy based on state observer is proposed in this paper. When EPS failed, by detecting the cornering angle of the steer wheel or the torsion of the steer wheel, the yaw rate command can be estimated. The vehicle's body is forced...
Based on the analysis of the steering performance, the objective of this paper is to present evidence for the tractor adopted the four-wheel steering (4WS) which can improve the handling and stability of tractor semi-trailer. The simplified single track model with 3 DOF for 4WS tractor semi-trailer has been constructed for dynamic simulation through time-domain response on the two states of small...
Automatic steering control has a direct impact on satisfaction of various vehicle performance requirements including obstacle avoidance, lane tracking accuracy, and passenger comfort. The presence of unknown vehicle dynamics in steering applications requires a robust control design potentially reducing the unexpected effects of uncertain driving conditions and minimizing vehicle path deviations in...
In view of the vehicle cornering or path changing under ultimate handling maneuver, a 4-DOF nonlinear vehicle dynamics model which takes the longitudinal velocity, lateral velocity, yaw rate and body roll angle as the state variables is presented. Based on the dynamic analysis, the method which using additional yaw moment produced by different longitudinal braking force among each wheels to improving...
LIM track transportation lowers the construction price, increases stability as well as improves curve passing. It belongs to green transportation. So it's greatly demanded to satisfying the medium carrying capacity in cities. But the related research hasn't yet done in China. The paper introduces the characteristics of LIM track transportation, setups coupled dynamic model between vehicle and track...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.