采用离子电流法与机体振动法检测爆震的比较

Comparison of Knock Detecting between Ionic Current Method and Block Vibration Method

在试验中 ,采用离子电流法和机体振动法同时检测发动机的爆震 ,采用双通道示波器同时记录离子电流法和机体振动法检测到的信号 ,并通过波形对比和快速傅里叶变换对信号进行分析和比较 .结果表明 :2种方法均可以准确实现爆震测量 ;相对于机体振动法而言 ,离子电流法具有安装方便、信噪比高、信号处理简单、测量准确、成本低廉等优点 ,是一种具有应用潜力的新技术 .

Engine knock due to abnormal combustion can be detected by using the ionic current method and the block vibration method. The signals are recorded by the dual-channel oscilloscope while the analysis and comparison of signals are made by comparing waveform and fast Fourier transform (FFT). The ionic current method has many advantages when compared with the block vibration method such as convenient installment, high signal to noise ratio, simple signal-processing, accurate measurement and low cost.