A study on the determination of fuel injection timing based on the control of pressure synchronization in real-time for a Constant Volume Combustion Chamber

The understanding of the diesel combustion mechanism is crucial in the optimization of fuel combustion efficiency and emission formation, a control method of the fuel injection timing and an experimental combustion measurement on a constant volume combustion chamber (CVCC) were carried out. A pre-combustion technique has been used to burn combustible gas mixtures, including acetylene, oxygen, and nitrogen, to generate diesel engine conditions. The created combustion pressure in CVCC was quantified by a piezoelectric transducer pressure sensor, and a microcontroller processed the consecutively recorded pressure data to determine the desired fuel injection timing, like diesel engine conditions, by real-time synchronization. Then the diesel combustion pressure, rate of heat release, and ignition delay were analyzed under conditions of fuel injection pressure, ambient temperature, and oxygen concentration corresponding to 1200 bar, 1000 K, and 21%, respectively. The obtained results revealed that the fuel injection control algorithm met the desired operating pressure conditions precisely within 2.7% in error. Moreover, the observations from the combustion pressure and rate of heat release analysis showed a similar development trend as compared to diesel combustion.