| Summary: | 碩士 === 國立臺北科技大學 === 車輛工程系所 === 96 === The traditional steering system cannot be operated simultaneously well in low and high vehicle speed because of the one degree-of-freedom mechanism connected left and right tire. For low-speed cornering, the turning radius become longer, in addition, it can not turn stably at higher velocity. According to these reasons, we want to use steer-by-wire system for research to improve these defects. This research builds the mathematical models of quarter-car and half-car for vehicle during cornering, and analyzes suspension link geometry relative to roll center by using closure equation. A vehicle with independent steering system can adjust the tire angle automatically in accordance with load transfer and running conditions.
This study using the mathematical models to design tires steering angle when vehicle during cornering, therefore, considering the load transfer for front axis two tires when vehicle during cornering and the direct proportion between cornering force and tire load, brings up a new steering concept about using load transfer to modulate front axis two tires steering angle to make vehicle conform to different speed, then the vehicle steering characteristic can be better than traditional steering system. This research also uses mathematical models and Matlab software to describe vehicle dynamic and calculate how to modify two tires steering angle. Finally, we build an independent steering system and introduce the proposed steering concept to analysis results through ADAMS/Car software.
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