一、引言在汽车发动机台架试验中,需要用环境湿度值对台架试验相关参数进行修正以保证结果的准确性。奇瑞汽车股份有限公司的发动机台架均配置了高精度湿度传感器来采集环境湿度,这些传感器一直由外部检测机构进行现场校准。但此方法存在局限性。因此,有必要自行研究可靠性更好,操作性更强,更能保证量值溯源的校准方法。二、现场湿度传感器原理及信号处理电路分析外部检测机构采用的是目前比较常用的校准试验台架传感器的方法。好处是结果一目了然,贴近实用。如果把台架和传感器看做一个整体,就无法提出 I. INTRODUCTION In the automobile engine bench test, the relative parameters of the bench test need to be corrected with the ambient humidity to ensure the accuracy of the result. Chery Automobile Co., Ltd. engine gantry are equipped with high-precision humidity sensor to collect ambient humidity, these sensors have been external calibration agencies on-site calibration. However, this method has its limitations. Therefore, it is necessary to study on its own better reliability, more operability, and more to ensure the traceability of the calibration method. Second, the principle of the scene humidity sensor and signal processing circuit analysis External testing agencies using the more commonly used method of calibration test bench sensor. The benefit is that the results are clear at a glance and close to practical. If the gantry and the sensor as a whole, it can not be made