ระบบจำลองพลศาสตร์ยานยนต์ร่วมกับระบบล้อ ระบบรองรับและระบบบังคับเลี้ยวจริง
Now a day, the developments of automotive systems are focused on safety and comfort. Therefore, understandings of tire force generation and accurate prediction of its effects on vehicle motion are necessary. This thesis reports a Hardware-In-the-Loop (HIL) system used for measuring and predicting ef...
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| 格式: | Theses and Dissertations |
| 語言: | Thai |
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จุฬาลงกรณ์มหาวิทยาลัย
2009
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| 主題: | |
| 在線閱讀: | https://digiverse.chula.ac.th/Info/item/dc:44012 |
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| 機構: | Chulalongkorn University |
| 語言: | Thai |
| 總結: | Now a day, the developments of automotive systems are focused on safety and comfort. Therefore, understandings of tire force generation and accurate prediction of its effects on vehicle motion are necessary. This thesis reports a Hardware-In-the-Loop (HIL) system used for measuring and predicting effects of such force. The system simulates vehicle motion by replacing the front wheel of a bicycle model with a real wheel, suspension, and steering system. The wheel is running on a rotating drum whose speed and orientation can be controlled. States of vehicle in the model are used to control this wheel-drum system. Tire force due to slip angle between the wheel and the drum is sent back to the bicycle model to make simulation of the motion of the vehicle more realistic. HIL test rig consists of a front wheel, suspension, and steering system from the left side of Nissan Sunny B10. The diameter of the wheel is 580 mm. while the diameter of the drum is 600 mm. Testing of the HIL system shows that the steering angle of the wheel and the drum can be adjusted between -5 to 8 degrees. Maximum slip angle is in the range of +/-3 degrees. The maximum speed of wheel is 3.7 rev/s (24.2 km/h) at zero slip angle and 2.6 rev/s (17.1 km/h) while slip angle is maximum. Using the HIL system for vehicle dynamic testing shows nonlinear results of lateral tire force generation and the cornering stiffness of this wheel system which is about 1,250 N/degree. Moreover, the skidpad test shows that the HIL system predicts the car to be more understeer compared to the result predicted only with the model. Step response testing also shows significant delay and oscillation of angular velocity of the car. With only the model, these responses would not be apparent to the designer. |
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