某乘用车的档位传感器精度优化设计

Optimal Design Ofa Certain Passenger Car Transmission Range Sensor′s Accuracy

霍尔式传感器对磁场变化较为敏感,而档位传感器存在的特殊金属结构会带来不可避免的外部磁场干扰,影响档位模式的判断结果。为了使传感器精度不受此影响,运用FLUX和MATLAB对永磁铁四周磁感应强度的空间分布进行仿真计算、分析磁铁的尺寸、磁铁与芯片敏感元件间的气隙以及磁铁相对安装位置对传感器测量角精度的影响,提出了一种可抗外界磁场干扰且精度达到工程使用要求的低成本档位传感器磁铁优化选型方案,并与台架试验结果相对比,验证该方案的可行性。

The Hall sensor is more sensitive to magnetic field changes,and the special metal structure of the transmission range sensor will bring inevitable external magnetic field interference and affect the judgment result of the gear position mode.To keep the accuracy of the sensor from this,we used FLUX and MATLAB to simulate the spatial distribution of magnetic induction intensity around permanent magnet Then,we investigated how the size of the magnet,the air gap between the magnet and the sensitive component of the chip,and the relative mounting position of the magnet influence the accuracy of the sensor.Finally,we propose a low-cost gear sensor magnet optimization selection scheme that is resistant to external magnetic field interference and meets engineering requirements,and compared the simulation results with bench test results to verify the feasibility of the scheme.