PGM-FI System Description - Injection Control
Fuel injection controls include fuel injection amount control, fuel cut control, and fuel pump control. Adopting PGM-FI (programmed-fuel injection) technology enables accurate fuel controls, which contributes to increasing engine power and decreasing fuel consumption.
Fuel Injection Amount
The fuel injection amount is determined by adding correction values to a basic injection amount. The powertrain control module (PCM) controls the amount of fuel injection by the length of time the injector is energized.
Fuel Injection Timing
The fuel injection timing is determined by the PCM, which calculates the injection time for each cylinder based on the signals sent from the crankshaft position (CKP) sensor and the camshaft position (CMP) sensor. The PCM then controls the time to energize the injector. In addition, the fully sequential injection system is adopted as a fuel injection system.
CKP Sensor
The CKP sensor is attached to the oil pan. Each of the 58 teeth on the CKP pulse plate passes over it, a pulse signal is delivered to the PCM.
CMP Sensor
The camshaft position (CMP) sensor is attached to the cylinder head. Every time one of the three protrusions of the camshaft pulley passes over it, a pulse signal is delivered.
Fuel Injector
The fuel injectors are installed on the cylinder head, they use multiple nozzles to inject high pressure fuel into the combustion chamber. Providing fewer injection holes promotes a finer fuel spray and improved fuel consumption by reducing fuel adherence to the top surface of the piston, reduction of hydrocarbons (HC) discharge, and higher engine performance.
MAF Sensor/IAT Sensor
The mass air flow (MAF) sensor/intake air temperature (IAT) sensor contains a hot wire, a cold film, and a thermistor. The sensor is in the intake air passage. The resistance of the hot wire, the cold film, and the thermistor changes due to intake air temperature and air flow. The control circuit in the MAF sensor controls the current to keep the hot wire at a set temperature. The current is converted to voltage in the control circuit, then sent as an input to the PCM.