基于PIC单片机的热膜式空气流量计设计  

Design of a hot-film air flow sensor based on PIC

作　　者：黄修铜 王婷旺 杨文涛[1] 王鲜[1] 

机构地区：[1]华中科技大学光学与电子信息学院,湖北武汉430074

出　　处：《传感器世界》2013年第11期15-19,共5页Sensor World

摘　　要：介绍了一种基于PIC单片机的数字输出型热膜空气流量计,用于汽车进气流量的检测。首次提出以PIC单片机为流量计控制核心,充分利用单片机内部的ADC、CCP、PSMC等硬件资源,实现了热膜传感单元输出模拟信号的采集、模数转化,以及流量信号、温度信号的输出控制等功能。针对热膜传感单元流量信号存在对环境温度交叉敏感等问题,提出一种基于二元回归分析法的热膜式流量计的校准方法,并详细介绍了流量计的自校准过程。An intelligent digital hot-film air flow sensor is designed based on PIC microcontroller, which is used for detecting the intake of automotive air mass. The PIC MCU acts as the central controller of the air flow meter, and performs the signal processing and control of the meter, In allusion to the cross-sensitivity of ambient temperature, a calibration method of air flow meter based on binary regression analysis is presented, and the detailed process of calibration is introduced

关 键 词：PIC 空气流量计 热膜式 校准 

分 类 号：U464.136[机械工程—车辆工程] TP368.1[交通运输工程—载运工具运用工程]