Diseño e implementación de un software para obtención de potencia y torque por el método de aceleración libre en un smartphone con protocolo OBD II para la carrera de Ingeniería Automotriz.

Abstract

The objective of this degree work was to design and implement a software to obtain power and torque by the free acceleration method in a smartphone with OBD II protocol. In order to obtain the moment of inertia k, several tests were carried out to adjust it to an ideal value, it started with a value of 0.071 [kg-m2] but the expected results of parameters of interest, were not obtained, then the value was assumed 0.08 [kg-m2] but a good adjustment was not obtained, until it was determined that the value 0.078 [kg-m2] gives very similar values for both methods (dynamometer and software). To establish the reliability of the results, the determination of the number of tests required was applied and it was carried out using the statistical method with a confidence level of 95.45% and an error margin of 5% and it was determined that to obtain this reliability it was necessary to perform 6 tests. The tests obtained in the chassis dynamometer of effective power rollers were carried out without a correction factor at an estimated height of 2700 [m.s.n.m] where the CCICEV (Centre for technology transference for training and research in vehicle emissions control) is located. The results of the research suggest that: the precision in obtaining the results depends on a great extent on the adjustment of the inertia moment value. The value of the inertia moment for the 4-cylinder engine, atmospheric type of ignition caused by Volkswagen golf, version plus style 2014 was 0.078 [kg-m2]. In the comparison of the dynamometer method with the software it is reliable to evaluate these parameters. It is recommended to be involved with the method in order to use it as a diagnosis line in a preventive maintenance of the internal combustion engine.