| Summary: | 碩士 === 國立交通大學 === 工學院精密與自動化工程學程 === 104 === As electronic technology in automotive industry is developing rapidly, the automotive subsidiary of electronics increases. In contrast, safety and reliability of electronic devices, also draw much attention and concern. The purpose of this thesis is to explore safety and reliability of the power window anti-pinch system. This thesis uses the C language in programming, and is programmed into a microprocessor Microchip PIC16F1827 in a power window to achieve anti-pinch. The power window motor drives the rotation of the axis center. N pole and S pole contained in each of two Hall sensors generate pulse signals. The pulse signals are used to determine positions of the power window up or down, and the time interval is calculated to set the threshold pulse of anti-pinch. A finite state machine determines whether the window is automatic or manual control and the state transition controls the state of the window: up, down, or anti-pinch. In order to avoid misjudging the anti-pinch, the anti-pinch mechanism is set by a parametric method and is only triggered when the window rises in the anti-pinch zone and the pulse signal exceeds the threshold pulse for three times or the specified timeout of the Hall sensor signal expires.
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