Patent ID: 9273625
Filing Date: 2016-03-01
CPC Classification: F02D,F02M

Claim Text:
1. A method for controlling a high-pressure fuel supply pump configured to supply pressurized fuel to an internal combustion engine, the high-pressure fuel supply pump comprising a compression chamber, a solenoid-actuated intake valve configured to deliver unpressurized fuel to the compression chamber, a movable plunger reciprocating in the compression chamber between a first plunger position (BDC) and a second plunger position (TDC), the movable plunger pressurizing fuel in the compression chamber, and a discharge valve configured to discharge pressurized fuel from the compression chamber to be supplied to the internal combustion engine, the solenoid-actuated intake valve being configured to be biased into a first direction towards a first stop position by means of a biasing force and being configured to be displaced against the biasing force into a second direction opposite to the first direction towards a second stop position by means of a magnetic force and to be kept at the second stop position by means of the magnetic force, the method comprising: applying a first control current to the solenoid-actuated intake valve, the first control current displacing the solenoid-actuated intake valve into the second direction to the second stop position during a first compression period in which the movable plunger moves upward; subsequently shutting off the first control current but keeping the solenoid-actuated intake valve at the second stop position during the first compression period; subsequently applying a second control current to the solenoid-actuated intake valve during an intake period in which the movable plunger moves downward, the intake period immediately following the first compression period; and, subsequently decreasing the second control current being applied during the intake period down to zero, wherein