Figure 5.3: Rollover coefficient estimator for a double-lane change maneuver.

e active front steering control is to increase or decrease the steering angle of the front wheel

under the premise of the steering angle controlled by the driver according to the driving state of

the vehicle, thus improving the maneuverability and stability of the vehicle.

rollover by sending steering pulses to a single rear wheel whenever a rollover coefficient is out-

side a predetermined range. e system provides extra steering with respect to a current steering

input from the driver until the rollover coefficient ultimately drops into safe area, as shown in

Figure 5.3.

PARS. As can be seen, the concept of applying a series of pulses is similar to the standard

commercial anti-lock braking system (ABS). e PARS system is a simple, inexpensive, and

lightweight component that can be added to the vehicle when the vehicle already has ABS.

Sensors for ABS can be simultaneously used to obtain the various measurements for this sys-

tem. In addition, the system can be used in conjunction with other stability or yaw control or

rollover control systems such as differential braking systems. e PARS system consists of two

main parts: a pulse-generating device and a switch controller. e generated pulses provide the

controller’s steering input which, together with the driver’s steering input, helps to control the

vehicle’s rollover. e switch controller includes a rollover estimator that calculates the rollover