TAILIEUCHUNG - IMechatronic Systems, Applications Edited by Annalisa Part 10

Tham khảo tài liệu 'imechatronic systems, applications edited by annalisa part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Mechatronics Design of an Unmanned Ground Vehicle for Military Applications 245 4. Implementation In this chapter the implementation of the UGV demonstrator is explained in detail. The chapter is divided into two main parts - the implementation of the hardware and the software systems of the vehicle. Hardware Implementation Drive-by-wire capability was realized with electric actuators that drive the control devices of the vehicle. Actuators were installed so that they can be detached from the vehicle controls when driving manually. This way the vehicle remains street legal and is safe to drive among normal traffic. With street legal vehicle there was no need for complicated and costly transportation arrangements. All the actuators that drive the control devices were sized so that they fit the planned positions but also that they have enough power to use the control devices in all situations. Measuring the needed force to use the control devices was done with standard scales. It was taken into consideration that the power steering and the brake booster are not in use when the engine is not running. The vehicle is equipped with automatic transmission and the gear lever situated in the middle console was instrumented by a detachable linear actuator see Fig. 3 . The actuator has two limit switches and an incremental encoder integrated inside it. When the software is started the motor needs to be calibrated. Calibration is done by driving the motor to its limit where a limit switch stops the motor. That position becomes the reference point. Also every time either of the limit switches is activated the position is calibrated again in case some inaccuracies would have occurred. After the calibration the position of the gear lever can be calculated from the encoder pulses. All gear lever positions are achievable with this arrangement. The steering wheel is actuated using a brushed DC-motor attached to a stand built in place of the removed center console. The motor is .

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