FUEL INJECTOR [SKYACTIV-D 2.2]

id0114z7108200

Purpose, Function

• Fast-response, Piezo-electric type fuel injectors have been adopted which achieve highly precise fuel injection control.

• The fuel injection patterns are varied and the concentration of air-fuel mix can be increased according to the 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

DTC

Fail-safe

P0201:00

P0202:00

P0203:00

P0204:00

P1378:00

P1379:00

P2146:00

P2147:00

P2148:00

P2149:00

P2150:00

P2151:00

•  PCM restricts engine torque.

•  Inhibits the EGR control.

•  Inhibits the diesel particulate filter regeneration control.

•  Inhibits engine-stop by operating the i-stop function.

•  PCM restricts engine-transaxle integration control.

P1675:00

P1676:00

•  Limits the engine torque or the upper limit of the engine speed.

•  Inhibits the auto DPF regeneration control.

•  Fully open the intake shutter valve.

•  Inhibits the compulsory DPF regeneration control.

•  Inhibits the EGR control.

•  PCM restricts engine-transaxle integration control. (ATX)

•  Inhibits engine-stop by operating the i-stop function.

DTC	Fail-safe
P0201:00 P0202:00 P0203:00 P0204:00 P1378:00 P1379:00 P2146:00 P2147:00 P2148:00 P2149:00 P2150:00 P2151:00	• PCM restricts engine torque. • Inhibits the EGR control. • Inhibits the diesel particulate filter regeneration control. • Inhibits engine-stop by operating the i-stop function. • PCM restricts engine-transaxle integration control.
P1675:00 P1676:00	• Limits the engine torque or the upper limit of the engine speed. • Inhibits the auto DPF regeneration control. • Fully open the intake shutter valve. • Inhibits the compulsory DPF regeneration control. • Inhibits the EGR control. • PCM restricts engine-transaxle integration control. (ATX) • Inhibits engine-stop by operating the i-stop function.