Determinación del rendimiento volumétrico real en motores de combustión interna por medio de una interfaz gráfica, entre dos motores de las mismas características con diferentes kilometrajes.

Abstract

The following investigations work a study and analysis of the volumetric efficiency of internal combustion engines was carried out, a graphic interface was designed and developed. For the design of the interface, the piezoelectric pressure transducer method was used as a reference to measure the volumetric efficiency. This research work began with the literature review and collection of information, both of study parameters involved and the information of equipment and instruments that allow the development of the objectives. For the analysis of the behavior of gases inside the cylinder they were considered as perfect gases and subject to the law of gases. The elements such as: Bosch pressure sensor, DAQ USB 6009 data acquisition card, and ELM 327 scanner were selected according to the needs and study conditions. The collection and processing of data were developed with LabVIEW software, where graphically it was possible to visualize data in real time and at the same time store information for further analysis, this interface also allowed the entry of geometric parameters for the configuration of the engines analyzed. The tests were carried out on engines of identical characteristics, but with different mileages accumulated under the same atmospheric and operating conditions. The results obtained had an accuracy of up to 3% using the transducer method. The comparison between the two engines Theta II 2.0 MPI at 3600 rpm in its maximum values of volumetric efficiency revealed that there was a loss of 12.67% in a difference of 90627 km accumulated at an altitude of 2674 m.a.s.l. and 17 degrees Celsius, it is lost cannot be considered as a standard by the different existing factors as maintenance and driving that can modify this result. It was concluded that there is a direct relationship between the decrease in volumetric efficiency and wear due to operation. The results obtained in the present work allow us to open the way to future research. It is recommended to carry out a comparative study of the volumetric efficiency at different altitudes in the same vehicle.