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出租汽车计价器多使用光电式传感器（后简称ＰＳ）和霍尔式传感器（后简称ＨＬ），本文将介绍改ＰＳ来代用ＨＬ的方法及可行性。
Taximeter more use of photoelectric sensor (hereinafter referred to as PS) and Hall-type sensor (hereinafter referred to as HL), this article will introduce the PS to replace the HL method and feasibility.