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This paper propose a unified chassis control (UCC) strategy to improve agility, maneuverability and, vehicle lateral stability by the integration of active front steering (AFS) and electronic stability control (ESC). The proposed UCC system consists of a supervisor, a control algorithm, and a coordinator. The supervisor determines a target yaw rate and a target velocity. To achieve a target yaw rate and velocity, the control algorithm determines a desired yaw moment and a desired longitudinal force, respectively. The desired yaw moment and the desired longitudinal force can be generated by the coordination of the AFS and ESC systems. To consider a performance limit of the ESC system and tires, the coordination is designed using the optimal method. Closed loop simulations with a driver-vehicle-controller system were conducted to investigate the performance of the proposed control strategy using CarSim vehicle dynamics software and the UCC controller coded using Maltab/Simulink.

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We thank Drs Singh, Bhargava, and Gupta for their interest in our recent work. 1 They underscored the importance of atelectasis as a possible parameter for treatment response among tuberculosis patients. Although we agree that the presence of atelectasis is one of the important radiographic findings associated with tuberculosis, we do not think that atelectasis could be used as a marker for treatment response. As Drs Singh, Bhargava, and Gupta explained, atelectasis is caused by endobronchial tuberculosis or extrinsic compression of enlarged lymph nodes. Given that endobronchial tuberculosis and tuberculous lymphadenitis are very difficult to improve despite sterilization of tuberculous bacilli, atelectasis might not be a proper candidate for a surrogate of treatment response.Conflict of interest: No conflict of interest to declare.