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International Journal of Automotive Technology > Volume 13(4); 2012 > Article
International Journal of Automotive Technology 2012;13(4): 571-581.
MODELING AND CONTROL OF AN ANTI-LOCK BRAKE AND STEERING SYSTEM FOR COOPERATIVE CONTROL ON SPLIT-MU SURFACES
C. AHN1, B. KIM2, M. LEE3
1The University of Michigan
2Korea Electric Power Corporation
3Hyundai Motor Company
ABSTRACT
The brake and steering systems in vehicles are the most effective actuators that directly affect the vehicle dynamics. In general, the brake system affects the longitudinal dynamics and the steering system affects the lateral dynamics; however, their effects are coupled when the vehicle is braking on a non-homogenous surface, such as a split-mu road. The yaw moment compensation of the steering control on a split-mu road is one of the basic functions of integrated or coordinated chassis control systems and has been demonstrated by several chassis suppliers. However, the disturbance yaw moment is generally compensated for using the yaw rate feedback or using wheel brake pressure measurement. Access to the wheel brake pressure through physical sensors is not cost effective; therefore, we modeled the hydraulic brake system to avoid using physical sensors and to estimate the brake pressure. The steering angle controller was designed to mitigate the non-symmetric braking force effect and to stabilize the yaw rate dynamics of the vehicle. An H-infinity design synthesis was used to take the system model and the estimation errors into account, and the designed controller was evaluated using vehicle tests.
Key Words: Integrated chassis control, H-infinity design, Hydraulic system modeling, Vehicle dynamics
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