Direct Fuel Injection
90-8M0050731 MAY 2011
Page 3B-23
Operation
The operation of the system happens in milliseconds (ms); exact timing is critical for engine performance. As the crankshaft rotates,
air is drawn into the crankcase through the throttle shutter, into the plenum, and through the reed valves. As the piston nears
bottom‑dead‑center, air from the crankcase is forced through the transfer system into the cylinder. As the crankshaft continues to
rotate the exhaust and intake ports close. With these ports closed, fuel can be injected into the cylinder. The ECM will receive a
signal from the throttle position sensor (TPS), engine temperature sensor, and the crankshaft position sensor (flywheel speed and
position sensor). With this information the ECM refers to the fuel calibration (maps) to determine when to activate (open and close)
the injectors and fire the ignition coils. With the piston in the correct position, the ECM opens the fuel injector, high‑pressure fuel
is discharged into a machined cavity inside the air chamber of the air/fuel rail. This mixes the fuel with the air charge. Next the
direct injector will open, discharging the air/fuel mixture into the combustion chamber. The direct injector directs the mixture at the
bowl located in top of the piston. The piston's bowl directs the air/fuel mixture into the center of the combustion chamber. This air/
fuel mixture is then ignited by the spark plug.
Compressor notes:
On initial start‑up, some direct injectors are held open by the PCM to allow the compression from inside the
cylinders to pressurize the air rail faster within one or two strokes, or 60° of crankshaft rotation.
Idle notes:
Idle quality is controlled by fuel volume and fuel timing. The shift switch is mounted on the exhaust adapter plate and
is activated by a cam/notch in the upper shift shaft. The PCM monitors the switch and will change fueling, timing, and RPM limits
according to whether the engine is in gear or in neutral.
The TPS signals the ECM to change the fuel and spark without movement of the throttle shutters. The throttle cam is manufactured
to allow the TPS sensor shaft to move before opening the throttle shutter.
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Страница 43: ...General Information Notes Page 1C 18 90 8M0050731 MAY 2011 ...
Страница 84: ...Ignition Notes 90 8M0050731 MAY 2011 Page 2A 3 ...
Страница 89: ...Ignition Page 2A 8 90 8M0050731 MAY 2011 Electrical Plate Engine Harness 44731 1 2 3 4 5 6 ...
Страница 147: ...Charging and Starting System Notes Page 2B 36 90 8M0050731 MAY 2011 ...
Страница 153: ...Timing Synchronizing and Adjusting Notes Page 2C 6 90 8M0050731 MAY 2011 ...
Страница 156: ...Fuel Pump Notes 90 8M0050731 MAY 2011 Page 3A 3 ...
Страница 177: ...Direct Fuel Injection Page 3B 14 90 8M0050731 MAY 2011 Fuel Hose Components 4256 3 8 1 8 8 5 8 8 8 8 8 6 7 4 4 2 ...
Страница 179: ...Direct Fuel Injection Page 3B 16 90 8M0050731 MAY 2011 Air Hose Components 4257 1 1 2 3 6 4 5 7 8 9 ...
Страница 245: ...Direct Fuel Injection Notes Page 3B 82 90 8M0050731 MAY 2011 ...
Страница 248: ...Oil Injection Notes 90 8M0050731 MAY 2011 Page 3C 3 ...
Страница 261: ...Oil Injection Notes Page 3C 16 90 8M0050731 MAY 2011 ...
Страница 275: ...Powerhead Page 4A 10 90 8M0050731 MAY 2011 Exhaust Manifold and Exhaust Plate 7 44904 1 2 3 4 5 6 8 10 9 7 ...
Страница 277: ...Powerhead Page 4A 12 90 8M0050731 MAY 2011 Cylinder Head 14 44903 1 2 3 3 4 5 6 7 8 9 10 ...
Страница 283: ...Powerhead Page 4A 18 90 8M0050731 MAY 2011 Ref No Qty Description Torque Nm lb in lb ft 41 1 Hose 42 1 Worm gear clamp ...
Страница 326: ...Powerhead 90 8M0050731 MAY 2011 Page 4A 61 Starboard Side Oil Hose Routing 45579 ...
Страница 327: ...Powerhead Page 4A 62 90 8M0050731 MAY 2011 Port Side Oil Hose Routing 45580 ...
Страница 339: ...Powerhead Notes Page 4A 74 90 8M0050731 MAY 2011 ...
Страница 346: ...Cooling Notes 90 8M0050731 MAY 2011 Page 4B 7 ...
Страница 349: ...Cooling Notes Page 4B 10 90 8M0050731 MAY 2011 ...
Страница 367: ...Pump Unit Page 5A 18 90 8M0050731 MAY 2011 Ref No Qty Description Torque Nm lb in lb ft 41 1 Hose 42 1 Worm gear clamp ...