霍尔里程计的设计与研制

为解决GPS短时间信号失锁所造成的导航精度下降问题，基于霍尔开关的原理和特点，设计与构建车载霍尔里程计。根据对象齿轮的参数并结合磁路设计的仿真优化结果，对磁钢外形和磁通量进行优化设计，确定磁铁规格尺寸的选型。基于霍尔效应及感应理论和技术，采用磁场有限元软件对磁场扰动进行仿真。优化结果表明：在小于4mm的距离范围内，磁场扰动量均能得到有效识别，提高车辆行驶里程计算的准确性，使得霍尔里程计的抗电磁干扰及抗温漂能力大大提高。

Design and Development of Hall Odometer

In order to solve the problem of navigation accuracy decline caused by GPS signal losing lock in a short time, a vehicle-mounted Hall odometer is designed and constructed based on the principle and characteristics of Hall switch. According to the parameters of the target gear and the simulation optimization results of the magnetic circuit design, the shape and magnetic flux of the magnet steel are optimized, and the size of the magnet is determined. Based on the Hall effect and induction theory and technology, the magnetic field perturbation is simulated by using the magnetic field finite element software. The optimization results show that the magnetic field disturbance can be effectively identified in the range of less than 4 mm, which improves the accuracy of vehicle mileage calculation and greatly improves the anti-electromagnetic interference and anti-temperature drift ability of Hall odometer.