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This paper describes the development of Mando's new continuously controlled semi-active suspension system. The goals for the new system are 1) enhanced control performance and functionality for customer satisfaction and added value, 2) optimal design of variable valve for compact size, light weight and fast response. Based on the system requirements established from benchmarking and market needs, design of variable dampers, an ECU, sensors and control algorithms is carried out. Skyhook control is applied with a better road detection algorithm by using vertical wheel G sensors. New “Comfort” mode biased toward smooth ride adds more value to the vehicle. Co-operation with ESP helps increase the vehicle stability. Well-defined design procedure and test methods for verification and validation are followed. Simulation study, rig and vehicle integration test prove that the design goals are met.

This paper presents the integrated chassis control (ICC) system under development at MANDO. By sharing the sensor and control information through the communication link among the existing 2 or more chassis subsystems, the integrated chassis control system improves vehicle performance and reduces cost for the sensors and related wiring. ICC consists of continuously variable damping control system(CDC), rear toe angle control system(AGCS) and electronic stability program (ESP). In ICC, the steering angle and yaw control information of ESP are delivered to the other systems through the CAN interface, and co-operative control strategy overrides each subsystem to improve the vehicle handling performance and stability. The effectiveness of both integrated chassis control systems are illustrated by a computer simulation and vehicle test on dry asphalt, snow road surface and so on.

In this paper, we will present a torque and angle sensor for use in electrical power steering (EPS) systems. The developed sensor has torsion angle sensing capabilities between the input and output shafts linked by a torsion bar as well as multi-turn angle sensing of the steering wheel. The sensor is technically based on inductive position sensing for torque measurement and magnetic position sensing for additional multi-turn angle measurement. Digital output single edge nibble transmission (SENT) and pulse width modulation (PWM) are applied to strengthen noise performance in an automotive environment and enhance diagnostic capabilities. The torque channel consists of two electrically isolated sensors that can function independently. The angle channel also has five redundancies using angle information from inductive and magnetic channels during operation, even though there is only one reference signal for initialization.