井下速度检测部分以单片机为核心，通过霍尔速度传感器实时检测速度，超速后即会报警提示，并将超速信息进行存储。
Underground speed detection which based on single chip will real-time detect rate through the hall speed sensor, alarm and prompt after speeding, and store the information of speeding.
详细介绍霍尔速度传感器，里程计数脉冲的产生，步进电机的驱动和BL 2115集成电路在电子式车速里程表中的应用。
The Hall speed transducer, the generation of the mileage pulse, the driving of step motor and the application of integrated circuit of BL2115 in speedometer are introduced in detail.
本文在转速采样环节采用霍尔速度传感器作为电机速度采样器件，并且采用了M法和T法混合的方法进行测速，这样在低速和高速时都能保证采样精度。
In the aspect of speed sample, HALL speed sensor is adopt, and combined the m method and t method, so the sample precision can be ensured both in the high speed moment and low speed moment.
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