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HIGH PRESSURE FUEL PUMP CONTROL [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]

HIGH PRESSURE FUEL PUMP CONTROL [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]

SM2565314

id0140u0005600



Outline

• Changes the fuel pressure applied to the fuel injector according to engine operation conditions to improve engine output and startability.
• The PCM determines the fuel pressure value corresponding to the engine operation conditions based on each input signal, and drives the spill valve control solenoid valve for optimum control of fuel pressure.



Block Diagram
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OPERATION


Directly after engine start

• During a cold engine start, the fuel pressure is raised to promote fuel atomization.


Basic Control

• The PCM determines the target fuel pressure according to charging efficiency and performs feedback control by monitoring the fuel pressure in the fuel delivery pipe using the fuel pressure sensor.
― When idling after engine warm up: Approx. 10 MPa {102 kgf/cm 2, 1,450 psi}
― After engine warm up, engine speed is 3,000 rpm or less, charging efficiency is 60 % or more: Approx. 20 MPa {204 kgf/cm 2, 2,091 psi}
― After engine warm up, engine speed is 3,500 rpm or more, charging efficiency is 60 % or more: Approx. 25 MPa {255 kgf/cm 2, 3,626 psi}