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为满足船用柴油机缸压信号采集及分析的需求,提出并设计了一种新型嵌入式手持压力采集终端设备。系统由压电传感器、电荷放大电路、A/D采样模块、REAL6410核心板及相关外设等部分构成,利用压电传感器获取缸压信号,通过电荷放大电路转换成电压信号并放大,经过A/D采样后送入6410核心板处理。系统软件由参数设置模块、数据采集处理模块及数据存储传输模块组成,并实现了BSP的移植和终端交互软件,最后通过使用丹麦B&K公司的4294型手持式校准激振器进行对比实验验证了该系统的性能,并显示分析波形验证了系统的精度达到要求。
In order to meet the needs of marine diesel cylinder pressure signal acquisition and analysis, a new type of embedded handheld pressure acquisition terminal equipment is proposed and designed. The system consists of piezoelectric sensor, charge amplification circuit, A / D sampling module, REAL6410 core board and related peripherals and other components, the use of piezoelectric sensors to obtain the cylinder pressure signal through the charge amplifier circuit into a voltage signal and amplified by the A / D samples into the 6410 core board processing. The system software consists of parameter setting module, data acquisition and processing module and data storage and transmission module, and implements the BSP porting and terminal interaction software. Finally, it is verified by the contrast experiment using Danish B & K 4294 hand-held calibration exciter The performance of the system and the analysis of the waveform show that the accuracy of the system meets the requirements.