Technical Challenges in the Development of Vehicle

Stability Control

Eric Tseng

Ford Motor Company

In the past two decades, as technology has evolved, the use of electronic control in automotive applications has spread from powertrain to chassis systems. Active systems have been developed to improve vehicle control and safety. Among them, Anti-Lock Brake Systems (ABS), Traction Control (TC), and Vehicle Stability Control Systems (VSC) have already found their way into production passenger vehicles.

Vehicle stability control systems provide vehicle stability and handling predictability through the interaction of multiple chassis actuators. Currently, the external inputs to a vehicle stability controller generally consist of a steering wheel angular sensor, yaw rate sensor, and lateral accelerometer. VSC applies vehicle yaw torque actuation through individual wheel braking integrated with the existing ABS/TC technology. These advanced technologies of interactive vehicle dynamics have been developed at Ford in the pursuit of increased safety, improved performance and cost efficiency.

In this talk, I will discuss some of the challenges encountered such as driver intent recognition, control development philosophy, vehicle side slip estimation, road bank angle detection, and fault detection. In particular, road bank angle detection will be discussed in details.

Road bank angles have a direct influence on vehicle dynamics and lateral acceleration measurement. A vehicle stability control system that knows road bank angle has an advantageous capability in achieving desired control sensitivities for maneuvers on ice and snow, among all surfaces, while avoiding false/nuisance activation on a banked road. However, robustly obtaining bank information is difficult with current sensors due to the coupling between lateral dynamics and road bank.

I will present a method of road bank estimation and the theoretical background for the decoupling effort of lateral dynamics and road disturbances involved in bank estimation

Friday, January 12, 2001

3:30 - 5:00 p.m.

1500 EECS