Investigation into untripped rollover of light vehicles in the modified fishhook and the sine maneuvers. Part I: Vehicle modelling, roll and yaw instability

Vehicle rollovers may occur under steering-only maneuvers because of roll or yaw instability. In this paper, the modified fishhook and the sine maneuvers are used to investigate a vehicle's rollover resistance capability through simulation. A 9-degrees of freedom (DOF) vehicle model is first developed for the investigation. The vehicle model includes the roll, yaw, pitch, and bounce modes and passive independent suspensions. It is verified with the existing 3-DOF roll–yaw model. A rollover critical factor (RCF) quantifying a vehicle's rollover resistance capability is then constructed based on the static stability factor (SSF) and taking into account the influence of other key dynamic factors. Simulation results show that the vehicle with certain parameters will rollover during the fishhook maneuver because of roll instability; however, the vehicle with increased suspension stiffness, which does not rollover during the fishhook maneuver, may exceed its rollover resistance limit because of yaw instability during the sine maneuver. Typically, rollover in the sine maneuver happens after several cycles. It has been found that the proposed RCF well quantifies the rollover resistance capability of a vehicle for the two specified maneuvers. In general, the larger the RCF, the more kinetically stable is a vehicle. A vehicle becomes unstable when its RCF is less than zero. Detailed discussion on the effects of key vehicle system parameters and drive conditions on the RCF in the fishhook and the sine maneuver is presented in Part II of this study.

[1]  Huei Peng,et al.  Differential-Braking-Based Rollover Prevention for Sport Utility Vehicles with Human-in-the-loop Evaluations , 2001 .

[2]  Aleksander B. Hac.  Influence of Chassis Characteristics on Sustained Roll, Heave and Yaw Oscillations in Dynamic Rollover Testing , 2005 .

[3]  Hans B. Pacejka,et al.  Tire and Vehicle Dynamics , 1982 .

[4]  Leonard Segel,et al.  Theoretical Prediction and Experimental Substantiation of the Response of the Automobile to Steering Control , 1956 .

[5]  Dennis A. Guenther,et al.  Modeling of Rollover Sequences , 1993 .

[6]  Lutz Eckstein,et al.  Effects Causing Untripped Rollover of Light Passenger Vehicles in Evasive Maneuvers , 2004 .

[7]  David M. Bevly,et al.  A Study of the Effect of Various Vehicle Properties on Rollover Propensity , 2004 .

[8]  Manfred Frimberger,et al.  Influences of Parameters at Vehicle Rollover , 2000 .

[9]  David H. Klyde,et al.  Estimation of Passenger Vehicle Inertial Properties and Their Effect on Stability and Handling , 2003 .

[10]  Gary J. Heydinger,et al.  A Study of Vehicle Response Asymmetries During Severe Driving Maneuvers , 2004 .

[11]  Vincent Nguyen.  VEHICLE HANDLING, STABILITY, AND BIFURCAITON ANALYSIS FOR NONLINEAR VEHICLE MODELS , 2005 .

[12]  Aleksander B. Hac,et al.  INFLUENCE OF ACTIVE CHASSIS SYSTEMS ON VEHICLE PROPENSITY TO MANEUVER-INDUCED ROLLOVERS. IN: OCCUPANT AND VEHICLE RESPONSES IN ROLLOVERS , 2002 .

[13]  David H. Klyde,et al.  The effect of tire characteristics on vehicle handling and stability , 2000 .

[14]  Huei Peng,et al.  EVALUATION OF VEHICLE DYNAMIC CONTROL FOR ROLOVER PREVENTION , 2004 .

[15]  Gary J. Heydinger,et al.  AN INVESTIGATION, VIA SIMULATION, OF VEHICLE CHARACTERISTICS THAT CONTRIBUTE TO STEERING MANEUVER INDUCED ROLLOVER. IN: OCCUPANT AND VEHICLE RESPONSES IN ROLLOVERS , 1992 .

[16]  B. Johansson,et al.  Untripped SUV rollover detection and prevention , 2004, 2004 43rd IEEE Conference on Decision and Control (CDC) (IEEE Cat. No.04CH37601).

[17]  Allan Y. Lee,et al.  Coordinated Control of Steering and Anti-Roll Bars to Alter Vehicle Rollover Tendencies , 2002 .

[18]  Garrick J. Forkenbrock,et al.  AN EXPERIMENTAL EXAMINATION OF SELECTED MANEUVERS THAT MAY INDUCE ON-ROAD UNTRIPPED, LIGHT VEHICLE ROLLOVER - PHASE II OF NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S (NHTSA'S) 1997-1998 VEHICLE ROLLOVER RESEARCH PROGRAM , 1999 .

[19]  Aleksander B. Hac.  ROLLOVER STABILITY INDEX INCLUDING EFFECTS OF SUSPENSION DESIGN. IN: OCCUPANT AND VEHICLE RESPONSES IN ROLLOVERS , 2002 .

[20]  Masao Nagai,et al.  Study on a vehicle dynamics model for improving roll stability , 2003 .