编号
毕 业 设 计（论文）
二级学院 车辆工程学院
专 业 能源与动力工程
班 级 112040602
发动机飞轮壳 学生姓名 朱伟伟 学号***********
指导教师 杨新桦 职称
时 间 2016.5.19
摘要
发动机曲轴瞬时转速信号中蕴含着丰富的信息。通过对曲轴瞬时转速的分析，可以简单方便地诊断发动机状态和检测其工作异常。本文介绍了发动机曲轴电磁感应转速传感器输出信号的特征，根据信号特征近似模拟出曲轴转速信号。对电磁感应转速传感器输出的原始信号进行了采样、滤波、放大整形处理，采用高频计数法作为发动机曲轴瞬时转速的测量方法，计算出曲轴瞬时转速，同时判断出飞轮缺齿位置并产生一个缺齿脉冲信号。整个信号源发生系统模型的搭建和曲轴转速信号处理过程利用MATLAB/Simulink仿真平台进行仿真。通过对比分析低中高转速段仿真结果，曲轴转速信号处理效果理想，转速测量结果精度较高，飞轮缺齿脉冲信号满足燃油喷射的精度要求。
关键词：曲轴转速信号；信号模拟；信号处理；MATLAB/Simulink；缺齿信号
Abstract
Instantaneous rotational speed signal of engine crankshaft contains a wealth of information. Through the analysis of transient speed fluctuation of crankshaft , it is convenient for us to discern engine working conditions and detect its abnormal signals. This paper introduce the characteristics of the output signal of the electromagnetic induction speed sensor of the engine crankshaft, and according to the characteristics of the signal, simulate the crankshaft speed signal approximately. Through the sampling, filtering, amplifying, and reforming of the original speed signal, and take the measurement method of instantaneous speed of engine crankshaft by using high frequency counting method, then calculate the transient speed fluctuation of crankshaft , at the mean time, determine the position of the flywheel and generate a pulse signal. Through the use of MATLAB/Simulink simulation platform, the whole signal generator model have been built up and the crankshaft speed signal processing have been accelerated. By comparing the simulation results, the conclusion is crankshaft rotating speed signal processing have a good effect, while the speed measurement results have a relatively high accuracy, and th
e flywheel missing teeth pulse signal can meet the accuracy requirements of fuel injection.
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