Characterization of a DAQ´s system for a Single-cylinder Diesel Engine Test Bench

Introduction− Given the research potential currently presented by internal combustion engines, a complete characterization of their operating conditions requires taking into account the variety of sensors used to mea-sure their physical magnitudes, the multiple electronic devices used for the conditioning of signals and the stan-dards that define the communication syntax and syn-chronization. For this reason, it is necessary to develop software as a link between the instrumentation system and the user, to provide real-time visualization and stor-age of information.Objective− This study seeks to implement a methodol-ogy for the selection and adjustment of the data acqui-sition system for a Diesel engine test bench, as well as software developed to visualize the variables measured by the instruments.Methodology− The selection of the instruments used in the test bench was carried out, as well as the design of the signal treatment devices for each instrument, fol-lowed by set-up and calibration. Parallel to the above, interactive software was developed in a DAQ ́s for the visualization of the results obtained with the acquisi-tion system.Results− The results indicate that the developed cali-bration curve produces a considerable fit of the experi-mental data, and using residue analysis it was verified that the linear model developed was adequate to describe the behavior of the sensors.Conclusions− It was evidenced that 2 of the 7 of the sensors had uncertainty values lower than the measure-ment unit, which guarantees small or practically negli-gible deviations from the nominal value. Of the 7 types of instruments implemented, the sensor corresponding to the rotation speed presented the highest value of un-certainty; however, this value is adjusted to the errors allowed in the RPM measurements, which oscillates 5 % of their nominal value.