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针对内燃机参数采集,尤其是对瞬态参数实时采集时的特点,设计了基于DSP的内燃机数据采集系统.实验证明该系统完全适用于内燃机的数据采集. 相似文献
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本系统利用自制接口软、硬件将一台CRLEATE386DX微机与DN-2型内燃机测试控制系统相联,实现了内燃机性能试验数据的实时采集和处理。它可提高原系统的自动测试水平及试验结果的可信度,并使其功能得到扩展.文章还介绍了系统结构、工作原理,软、硬件配置状况及其功能. 相似文献
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根据内燃机示功图信号采集的特点,笔者提出了一种针对内燃机示功图的软硬件相结合的便携采集方案.在采集软件的设计中采用了多线程技术、循环缓存技术、与采集异步的连续存储技术和实时显示曲线的两次绘图法.以这些技术为基础在VC++6.0下实现了高速大容量内燃机示功图数据的连续采集、显示与存储.文中给出了关键算法的VC代码和一个实测系统的采集实例.试验证明: 结合适当的硬件,采用软件实现示功图信号的高速采集是可行的,能保证数据的正确性与完整性. 相似文献
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基于MATLAB的噪声信号采集与分析系统研究 总被引:4,自引:0,他引:4
基于MATLAB的数据采集工具箱(DAQ)和信号处理工具箱开发了一套声音信号采集分析系统,该系统不仅能够实现低成本、高精度的实时采集,还能将声音信号资料导入系统进行时域和频域分析。利用另外一个工具Compiler使编制的MATLAB程序能够独立运行从而提高了运行速度;配备了友好的图形用户界面(GUI),方便用户操作。最后给出了系统在内燃机噪声诊断方面的应用实例。 相似文献
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内燃机试验研究应用微机控制的进展 总被引:2,自引:1,他引:1
作者在英国格拉斯哥加利多尼亚大学内燃机试验室开发了一个微机控制图象化的数据采集与监控系统。该系统的发动机试验数据采集与运行控制程序利用虚拟技术将所有控制及测试参数集中分层显示在微机屏幕上,从而省去大量二次仪表。该系统还提供了一个用于发动机扭矩设定的自适调节模型,能自动调节控制电机以达到所设定的发动机负荷。所运用的这些方法,赋予发动机试验研究系统紧凑、有效和成本低的特点,使其得到了新的进展。 相似文献
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内燃机数据采集和分析系统的研究 总被引:14,自引:0,他引:14
介绍了内燃机数据采集和分析系统的结构、工作原理、功能和特点。本系统采用工业控制计算机和应用软件固化运行方式,提高了系统的抗干扰和抗病毒能力;采用自行设计的硬件电路配以自行开发的软件,形成了具有独创性的DMA技术,使内燃机的多路参数能同时采样;采用高速A/D配以光电编码器,使采样分辨率达0.1°CA,提高了系统的测量精度和分析精度,并建立了放热规律和喷油规律的数学模型。还论述了内燃机试验参数的测量方法以及提高其测试精度的措施 相似文献
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复合增压切换系统对柴油机瞬态特性的改善 总被引:4,自引:0,他引:4
为使涡轮增压柴油机适于转速频繁变动的场合,建立了复合增压切换系统用以提高其瞬态响应特性。它由谐振系统、涡轮增压器和微机控制的电动蝶阀组成。其谐振腔的容积变化和压气机的短接,都根据增压器的转速信号由微机控制电动蝶阀执行。在加速初期压气机短接,增压器空载加速,并由谐振增压替代涡轮增压。在加速后期,谐振系统提高了固有频率并与增压器协同产生复合增压效应。本文用特征线法进行该复合系统的模拟计算和系统优化,并在微机采样和控制试验台上进行了对比试验,证明该系统能使柴油机的瞬态特性明显提高。 相似文献
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基于MCS-51系列单片机开发了内燃机爆发压力监测系统,系统具备信号采集,峰值压力及压力升高率计算,液晶显示以及与上位机通信等功能。采用等间隔采样的方式,实现了对无转角信号的气缸爆发压力的采集,实验结果证明该系统能满足不同工况下内燃机爆发压力的监测要求,有较好的应用效果。 相似文献
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An experimental analysis is conducted investigating the differences between the variations of overall and local instantaneous heat transfer coefficients, during the engine cycle, in the combustion chamber walls of a direct injection (DI), air-cooled diesel engine located at the authors’ laboratory. For this purpose, a novel experimental installation is developed, which separates the engine transient temperature signals into two parts, namely the long- and the short-term response ones, processed in two independent data acquisition systems. Moreover, a new pre-amplification unit for fast response thermocouples, appropriate heat flux sensors and an object-oriented control code for fast data acquisition have been designed and applied. Experimentally obtained cylinder pressure diagrams are used as a basis for the calculation of the overall heat transfer coefficients, whereas one-dimensional heat conduction theory with Fourier analysis techniques, combined with an iterative procedure between calculated and measured temperature data, are implemented in order to calculate the instantaneous local heat transfer coefficients in the engine cylinder. Analysis of the experimental results reveals interesting aspects of transient engine heat transfer. Significant differences are disclosed between the overall and local heat transfer coefficient variations, with the importance of the latter one on engine design being emphasized. The local heat transfer coefficient on the cylinder head is quantified based on the experimental data. The effect of engine speed and load as well as of the air swirling motion on the heat transfer variations are presented. From the analysis results it is concluded that the instantaneous heat transfer variation is non-uniform, unlike its values calculated from standard correlations that assume spatial uniformity, noting that such information, especially for air-cooled diesel engines, seems to be very scarce in the open literature. 相似文献
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《Energy》2004,29(8):1085-1104
A computer analysis is developed for studying the energy and availability performance of a turbocharged diesel engine, operating under transient load conditions. The model incorporates many novel features for the simulation of transient operation, such as detailed analysis of mechanical friction, separate consideration for the processes of each cylinder during a cycle (“multi-cylinder” model) and mathematical modeling of the fuel pump. This model has been validated against experimental data taken from a turbocharged diesel engine, located at the authors’ laboratory and operated under transient conditions. The availability terms for the diesel engine and its subsystems are analyzed, i.e. cylinder for both the open and closed parts of the cycle, inlet and exhaust manifolds, turbocharger and aftercooler. The present analysis reveals, via multiple diagrams, how the availability properties of the diesel engine and its subsystems develop during the evolution of the engine cycles, assessing the importance of each property. In particular the irreversibilities term, which is absent from any analysis based solely on the first-law of thermodynamics, is given in detail as regards transient response as well as the rate and cumulative terms during a cycle, revealing the magnitude of contribution of all the subsystems to the total availability destruction. 相似文献
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介绍了发动机装配生产线翻板式输送小车及同步输送系统的运用.该系统能确保准确无误地、迅速高效地向装配操作者提供装配过程中所需零部件,同时,由于改变了零部件的配送方式,由原来的向装配岗位堆放批量装配用零部件改为单台配送到翻板式小车上,再通过该输送系统进行同步配送,解决了现场物料堆放混乱的问题,使生产现场物流整齐有序. 相似文献