基于三次样条插值的智能汽车酒驾测控系统设计

Design of intelligent car drunk driving measurement and control system based on cubic spline interpolation

针对采用半导体式酒精传感器MQ-3的智能汽车酒驾测控系统中传感器测量误差不容忽视的问题,提出一种使用三次样条插值进行酒精传感器温度补偿的方法。对酒精气体浓度范围为0.09～0.36 mg/L,温度范围为0～50℃的常见环境条件进行基于ARM9的智能汽车酒驾测控系统设计和硬件选型。该系统集成酒精检测、状态显示、语音报警和驱动继电器动作以禁止汽车启动等功能,能够实现从源头抑制酒驾;还考虑避免随行人员饮酒所造成的干扰问题,重点研究三次样条插值算法在酒精浓度测量结果温度补偿方面的应用。通过与酒驾测量仪KY-8200的实验对比,验证了该方案的有效性。

In allusion to the problem that the sensor's measurement error cannot be ignored in the intelligent car drunk driving measurement and control system equipped with the semiconductor-type ethanol sensor MQ-3,an alcohol sensor temperature compensation method based on cubic spline interpolation is proposed.An intelligent car drunk driving measurement and control system based on the ARM9 is designed,and hardware model selection is conducted for the alcohol gas environment condition with its concentration range of 0.09~0.36 mg/L and temperature range of 0~50 oC.In the system,the functions of alcohol detection,status display,voice alarm,and inhibiting car start by driving relay movements are integrated to realize drunk driving suppression from the source.The application of the cubic spline interpolation algorithm in the temperature compensation aspect of alcohol concentration measurement results is emphatically researched.The effectiveness of the scheme was verified by the comparison experiment with the drunk driving gauge KY-8200.