Operation Section
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Operation
• The discharge quantity is controlled by SCV control, the same as for the HP2, however it differs from the HP2 in that
the valve opening is adjusted by duty ratio control.
• In the intake stroke, the spring makes the plunger follow the movement of the ring cam, so the plunger descends to-
gether with the ring cam. Thus, unlike the HP2, the plunger itself also suctions in fuel. When the suctioned fuel passes
through the SCV, the flow quantity is controlled to the required discharge quantity by the valve opening and enters
the pump main unit.
• The quantity of fuel adjusted by the SCV is pumped during the pumping stroke.
SCV
Plunger B
Plunger A
Eccentric Cam
Delivery Valve
Suction Valve
Ring Cam
Plunger A: End of Compression
Plunger B: End of Suction
Plunger A: End of Suction
Plunger B: End of Compression
Plunger B: Start of Compression
Plunger A: Start of Suction
Plunger B: Start of Suction
Plunger A: Start of Compression
QD0707E
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