Driver Maneuvers Research Articles

Stability Limit and Handling Performance of a Driver-Tractor-Trailer System.

Steering stability of tractor-trailer vehicles has been studied in general by root locus analysis of lateral motions, or measuring their damping ratios. However, in actual driving, it is necessary to establish a handling performance index taking driver's maneuver and off-tracking of trailer into consideration. By the analysis of a driver-tractor-trailer system, an appropriate index for objective handling evaluation is proposed and three types of safety drive limit are investigated. Consequently, many design parameters can be easyily optimized for better handling performance.

Modeling the Effectiveness of Crash Avoidance Systems that Support Driver Maneuver Decisions: Lane Change Crash Avoidance Example and Issues

The purpose of this paper is to present a Crash Avoidance Systems (CAS) effectiveness modeling framework, based on concepts from reliability theory, that may complement kinematic, dynamic, and epidemiological methods for estimating CAS effectiveness. A sensitivity analysis is then reported that determined the impact of various model parameters and assumptions on effectiveness as the parameters vary. The paper concludes with a discussion of limitations and data needs associated with this modeling approach.

Active Safety Performance Analysis of Man-Vehicle System due to Driver's Maneuver in Emergency Avoidance.

Taking driver-vehicle closed loop system into account, active safety performances in emergency situation were analysed and the evaluation methods were proposed. Under such critical conditions, ordinary driver's avoiding maneuvers were examined using a motion-type driving simulator. According to the driver's maneuvers, a database of driving operational characteristics was constructed and a mathematical model of driver's operation was also derived. The performance of the driver-vehicle system was predicted by computational simulations. The agreements with the predicted performance by the simulation were verified from experimental results in emergency avoidance. Assuming the sudden change of road surface to slippery situation, the effect of an assistant control of steering was also estimated from both model simulations and experiments by the driving simulator.

9733035 A study on a lane departure warning algorithm based on driver's evasive maneuver Takamasa Suetomi, Koji kido, Tadayuki Niibe (Mazda Motor Corporation)

9733035 A study on a lane departure warning algorithm based on driver's evasive maneuver Takamasa Suetomi, Koji kido, Tadayuki Niibe (Mazda Motor Corporation)

Stability criteria of driver–vehicle system and objective evaluation of vehicle handling performance

The stability of a driver–vehicle system is analysed theoretically for lane change and straight running against crosswind, assuming a linear preview control of driver's steering manoeuvre. In order to evaluate objectively the handling performance of this typical driving, the quadratic forms of state variables as task performance and driver's work load are proposed, and their validity is confirmed by simulations on the steering property of current vehicles.

Rollovers on sideslopes and ditches

National data were analyzed to define the nature and importance of the problem of ran-off-road vehicles that rollover on slopes and ditches. Also, data from two specialized data bases were used to obtain insight on vehicle orientation and driver maneuvers in such crashes. This crash type was found to be the leading cause of ran-off-road driver fatalities, accounting for about one-fourth of this total. Highway factors associated with this crash type are identified to assist in the effort to define specific roadway locations where highway design countermeasures may be appropriate. Specifically, attention should be given to the outside of horizontal curves on rural two-lane roads. Vehicle dynamics computer simulations appear to offer the most promising approach to obtain needed insight on rollover risks for specific slope and ditch geometric combinations. Vehicle trajectory information found in this study should be useful in the design and interpretation of needed follow-on simulation studies. Vehicle trajectories in slope rollovers were found to be both different from, and more complex than, fixed object crashes.

Control strategy of active rear wheel steering in consideration of system delay and dead times

Theoretical control strategies of active rear wheel steering systems predicted by conventional control theory differ quantitatively from those of actual systems. One reason of the difference in control gains is investigated by a closed loop analysis in the case of lane change, using a linear preview driver control model, taking system delay and dead times into consideration and then minimizing the objective cost function consisted of driver's maneuver and course deviation.