Remapping the EFI in Automotive Engine Control Unit Using Piggy-Back ECU

Electronic fuel injection (EFI) is a complex system where many parts are connected together, from mechanical parts to electronic parts, to control the internal combustion engine. It must ensure many different things, and the most important thing in motorsport to achieve is power optimization. High power and engine responsiveness are often desired to gain a competitive edge. Usually, motorsport enthusiasts will upgrade the car's standard with aftermarket components such as higher-rated turbos, longer-duration camshafts, and exhaust systems. These are difficult to approach, time-consuming, and expensive tasks compared to the ECU calibration method. In Vietnam, most customers who want to change the performance of their vehicle use the remapping method on the factory ECU. By using the vehicle performance regulation method with a piggy-back ECU, it is easier for the user to adjust than the popular remap method. With advantages such as low cost and easy installation. And currently, there are very few documents describing and evaluating the effectiveness of piggy-back ECUs installed in vehicles. So in this paper, experimental remapping of the electronic fuel injection system with a piggy-back ECU was performed, and then we simulated the control algorithms of the electronic fuel injection system on LabView and compared the results with the experiment. This was based on a simulation model of the EFI system's operation algorithm, with many cases in various load engines and engine speeds. Simulation results are used to evaluate the algorithm on the piggy-back ECU.