IMPLEMENTATION OF TASKS ARCHITECTURE ON ELECTRONIC FUEL INJECTION SYSTEM FOR 2-STROKE INTERNAL COMBUSTION ENGINE

• Main Author: SUSANTO (NIM : 13214126), ADRIAN
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25056
• Institution: Institut Teknologi Bandung

<p align="justify"> <br /> <br /> Two-stroke internal combustion engine is one of the most widely used drive system. This engine has a high power-to-weight ratio causing this type of machine to be used <br /> <br /> as an aviation engine. Carburetor, which is widely used on this type of engine, reduces engine’s reliability at a high altitude. Therefore, the engine can not be used in medium altitude long endurance (MALE) unmanned aerial vehicle (UAV). In order for UAVs to use this machine, a more reliable fuel delivery system is required. One alternative that can be used is electronic fuel injection system (EFI). The EFI system can inject <br /> <br /> fuel actively so that engine's reliability will increase. However, this EFI system requires an electronic control unit to function properly. The unit is often called as engine control unit (ECU). <br /> <br /> The plant's need for real-time inputs requires the ECU to perform its functions effectively and efficiently. Therefore it needs a correct task architecture on the <br /> <br /> software of microcontroller for the engine to operate reliably. The development of this task architecture aims to improve the overall reliability of the system. The designed architecture was specifically developed for the 3W-157Xi B2 TS CS engine. <br /> <br /> The development process begins with a review of the literature on the topic of twostroke engine and electronic fuel injection. Then, the authors made observations on the behavior of the 4-stroke engine ECU used on commercially available motor vehicles. <br /> <br /> This observation is specifically aimed at the crank position signal used by the ECU and the injector and ignition control signals generated by the ECU. After the <br /> <br /> observation's data were obtained, an analysis was performed on specification, injection timing, strategy to detect machine condition, and timing constraint arising to assure system performance at high speed rotating engine. The design of the task architecture begins by classifying the functions that the ECU must run into the time-critical category. Time-critical functions are classified back into several tasks. The task will be executed when the system receives a signal to start the interrupt process. An external interrupt is used to detect external physical events. <br /> <br /> Meanwhile, the interrupt timer is used for tasks that must be executed with a certain duration of time. The task architecture is designed using a super loop concept with interrupts to handle time-critical functions. Based on the test results, the task architecture has successfully met the required design specifications. <p align="justify">