FUEL INJECTOR [SKYACTIV-D 2.2]

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Purpose, Function

•  Fast-response, piezoelectric type fuel injectors have been adopted which achieve highly precise fuel injection control.
•  The fuel injection patterns are varied and the optimum air-fuel mix can be formulated according to the driving conditions because the fuel amount and timing can be precisely controlled.

Construction

•  The fuel injectors are installed to the cylinder heads.
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•  Multi-hole piezoelectric type injectors have been adopted for the fuel injectors.
Note
•  The fuel injector has a built-in fuel pressure sensor/fuel temperature sensor.
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Fuel pressure sensor/fuel temperature sensor

•  Further precise fuel injection amount correction can be performed by a built-in fuel pressure sensor/fuel temperature sensor to improve fuel injection accuracy.


Piezoelectric element

•  The element possesses a property which generates voltage when a load (displacement) is applied, and load (displacement) when voltage is applied.


Operation

•  The fuel injectors inject fuel according to the signal from the PCM. The fuel injection time is determined by the energization time to the piezoelectric element.
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Fuel injection mechanism

1.  Before fuel injection (while fuel injection is stopped)

•  Because the three-way valve is pressed up when there is no energization to the piezoelectric element, the passage flowing fuel from the intermediate chamber is closed. Because the pressurized fuel fills the control chamber and pressure for pressing down the nozzle needle is applied, fuel injection is not performed.

2.  Fuel injection starts (nozzle needle rises)

•  When energization to the piezoelectric element starts, the three-way valve is pressed down and fuel in the control chamber passes through the control plate and flows out. When the fuel flows out, the pressure in the control chamber decreases, the nozzle needle is pressed up, and fuel injection is started.

3.  Fuel injection stops (nozzle needle lowering start)

•  When energization to the piezoelectric element stops, the three-way valve is pressed up and the high pressure fuel flows into the intermediate chamber from the orifice (sub). When the high pressure fuel flows in, the pressure in the intermediate chamber increases and the control plate is pressed up.

4.  Fuel injection stops (nozzle needle lowers)

•  The nozzle needle is closed instantaneously by increasing the pressure in the control chamber and the fuel injection is stopped.

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Fail-safe

DTCs

Fail-safe
P0201:00
•  Limits engine torque.
•  Inhibits the automatic DPF regeneration control.
•  Inhibits the manual DPF regeneration control.
•  Inhibits the EGR control.
•  Stops the G-vectoring control (GVC).
•  Inhibits the boost control.
•  Inhibits engine-stop by i-stop control.
•  Limits the engine transaxle total control.
P0202:00
P0203:00
P0204:00
P1378:00
•  Limits the engine torque/limits the maximum engine speed.
•  Inhibits the automatic DPF regeneration control.
•  Inhibits the intake shutter valve control.
•  Inhibits the manual DPF regeneration control.
•  Inhibits the EGR control.
•  Stops the G-vectoring control (GVC).
•  Limits the engine transaxle total control.
•  Inhibits the boost control.
•  Inhibits engine-stop by i-stop control.
P1379:00
P2146:00
•  Limits engine torque.
•  Inhibits the automatic DPF regeneration control.
•  Inhibits the manual DPF regeneration control.
•  Inhibits the EGR control.
•  Stops the G-vectoring control (GVC).
•  Limits the engine transaxle total control.
•  Inhibits the boost control.
•  Inhibits engine-stop by i-stop control.
P2147:00
P2148:00
P2149:00
P2150:00
P2151:00
P2696:00
•  Limits engine torque.
•  Limits the maximum engine speed.
•  Inhibits the EGR control.
•  Limits the engine transaxle total control.