PGM-FI System Description - Injection Control Civic

PGM-FI System Description - Injection Control

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 from the crankshaft position (CKP) sensor and camshaft position (CMP) sensor A. The PCM then controls the time to energize the injector.Therefore, the fuel injection control will vary depending on the state of the vehicle.In addition, the fully sequential injection system is adopted as a fuel injection system-

CKP Sensor

Regularly continuous teeth except for the one position on the CKP pulse plate passes over the CKP sensor, a pulse signal is delivered to the PCM-

CMP Sensor A

Every time one of the three protrusions of the pulse plate attached to the intake camshaft passes over camshaft position (CMP) sensor A, a pulse signal is delivered-

Fuel Injector (Direct Fuel-Injected Engine)

The fuel injectors use multiple nozzles to inject high pressure fuel into the combustion chamber.Providing few injection ports 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.

Fuel Injector (Port Fuel-Injected Engine)

The fuel injector for a gaseous fuel supply has multiple holes. The nozzle with multiple holes increases the fuel atomization and improves the mixing with the surrounding air.When the coil in the injector is energized, the plunger is pulled in. The needle valve, which is integral with the plunger, is pulled on full. Then, the injector sprays the fuel whose pressure is controlled by the fuel pressure regulator-

MAF Sensor/IAT Sensor 1 (1.5 L Engine (except Si))

Mass air flow (MAF) sensor/intake air temperature (IAT) sensor 1 contains a hot wire sensor, a cold wire sensor, and a thermistor. The sensor is in the intake air passage. The resistance of the hot wire, the cold wire, 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-

MAF Sensor/IAT Sensor (2.0 L Engine (except Type-R)), MAF Sensor/IAT Sensor 1 (1.5 L Engine (Si))

The mass air flow (MAF) sensor/intake air temperature (IAT) sensor (mass air flow (MAF) sensor/intake air temperature (IAT) sensor 1) has the MAF sensor contains a heater and two temperature sensors that are located on both sides of the heater at a very close distance.The heater is supplied current to the heating control at a constant temperature. The sensors upstream side and downstream side detect the mass air flow and the direction of air flow from the temperature difference due to heat conduction of air.The MAF sensor outputs the signal using a frequency (Hz)-

MAF Sensor/IAT Sensor 1 (2.0 L Engine (Type-R))

Mass air flow (MAF) sensor/intake air temperature (IAT) sensor 1 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-

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