Research and development in internal combustion engine shows variety of possibility. As the engine technology getting smarter and complex, simple concept of using power source from nature such as air is almost forgotten. In this project, an internal combustion engine using gasoline has gone through some modification with the aim of using compressed air as the source of power for some part of trips. This kind of technology called as air hybrid engine. Air hybrid engine is capable of utilizing the high pressure compressed air as power source to move pistons in engine cylinder. To control this system, a blended control module was developed by using an open-source Programmable Interface Controller (PIC) which is smaller and powerful microcontroller. Other components such as sensor also had been used in this project. The overall control that had been developed is a closed-loop control system where a closed-loop control system is one in which control action is dependent on the output and have feedback function. Main purpose of this project is to make an idea become alive. This project will mainly concerned on controlling the different mode of engine by using microcontroller PIC16F876A coupled with speed sensors. A program in MikroC is written and developed to communicate with the microcontroller according to plan sequences. A schematic design and simulation in Proteus Professional is created first to see whether it functioning or not before a prototype board can be developed. For purpose of voltage regulation, a single-pole double throw (SPDT) relays are used as“OUTPUT” signal from the sensor for the microcontroller. The “OUTPUT RELAY” is of the 5V SPDT powered from the switching output voltage 5V DC of the microcontroller. The application that is going to be developed must be in a low cost and a small scale basis. Subsequently, experimental simulation tests will be conducted to evaluate the response and accuracy behavior of the microcontroller before the control module can be developed. As for the result, a control module circuit prototype has been developed and it is ready to be tested with the engine.
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