Back to results
US 8,418,677 B2Granted
High pressure fuel pump control system for internal combustion engine
AssigneeHitachi Automotive Systems, Ltd.
InventorTakashi Okamoto
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeHitachi Automotive Systems, Ltd.
InventorTakashi Okamoto
Estimating the term…
A high pressure fuel pump control system for an internal combustion engine includes a fuel injection valve provided in a fuel common rail and a high pressure fuel pump for feeding fuel by pressure to the fuel injection valve. The high pressure fuel pump includes a pressurized chamber, a plunger for pressurizing fuel in the pressurized chamber, a discharge valve provided in a discharge passage, an intake valve provided in an intake passage, and an actuator for operating the intake valve. The control system includes a means for calculating a drive signal for the actuator to make a discharge amount or pressure of the high pressure fuel pump variable. The means reduces pressure in the common rail by opening the discharge valve to return the fuel in the fuel common rail to the pressurized chamber when a requirement for reducing the pressure in the fuel common rail is made.
A high pressure fuel pump control system which takes fuel into a pressurized chamber by descent of a plunger, pressurizes the fuel in the pressurized chamber by closing an intake valve at a desired timing during ascent of the plunger, and discharges the fuel into a common rail from a discharge valve comprising a check valve, wherein
A high pressure fuel pump control system which takes fuel into a pressurized chamber by descent of a plunger, pressurizes the fuel in the pressurized chamber by closing an intake valve at a desired timing during ascent of the plunger, and discharges the fuel into a common rail from a discharge valve comprising a check valve, wherein
Dependencies are inferred from the claim text.