本文介绍了一种基于PC机的内燃机试验台数据采集和分析系统 ,本系统采用基于PCI总线的高速A/D卡配以光电编码器进行数据采集 ,采样分辨率为 0 2°CA ,提高了系统的测量精度、分析精度 ;采用自行开发的软件 ,运用DMA技术 ,实现了高速数据采集和处理 ;建立了放热率的数学模型 ,并对 1135柴油机进行了数据采集和计算分析 ,给出了计算结果。 This paper introduces a PC-based internal combustion engine test bed data acquisition and analysis system, the system uses PCI-based high-speed A / D card with optical encoder for data acquisition, the sampling resolution of 0 2 ° CA, increased The measurement accuracy and the precision of the system were analyzed. By using self-developed software and using DMA technology, the high-speed data acquisition and processing were realized. The mathematical model of heat release rate was established and the data acquisition and calculation of 1135 diesel engine were given. Calculation results.