REMAPPING AND SIMULATION OF EFI SYSTEM FOR SI ENGINE USING PIGGYBACK ECU

Abstract

Electronic fuel injection (EFI) is a complex system comprising many parts, both mechanical and electronic, controlling an internal combustion engine. It carries out many different tasks. In motorsport, the most important thing to achieve is power optimisation. High power and engine responsiveness are often desired to gain a competitive edge. Usually, motorsport enthusiast will upgrade their stock vehicle with aftermarket components, such as higher rating turbo, longer duration camshafts, and exhaust system. These are difficult to carry out, time-consuming, and expensive tasks compared to the ECU calibration method. In Vietnam, most customers who want to change their vehicle’s performance choose the Remap method on Factory ECU. By using the vehicle performance regulation method with a piggyback ECU, it is easier for the user to adjust the power than by the popular Remap method, the advantages being, for example, low cost and easy installation. Currently, there are very few documents describing and evaluating the effectiveness of a piggyback ECU installed in a vehicle. So, in this paper, an experimental reconstruction of an electronic fuel injection system with a piggyback ECU was performed, then the control algorithms of the electronic fuel injection system were simulated in LabVIEW, and the results were compared with the experiment, based on the simulation model of the control algorithm of the EFI system with many modes with different engine loads and speeds. The simulation results are used to evaluate the algorithm for the piggyback ECU.