CONTROL DEVICE FOR HIGH-PRESSURE FUEL PUMP

WIPO Patent Application WO/2021/171775

A1

According to the present invention, a high-pressure fuel pump is quietly controlled by reducing noise generated by an anchor colliding with a fixed core. A control device (800) for the high-pressure fuel pump energizes a solenoid (205) in synchronization with reciprocating motion of a plunger, thereby controlling an intake valve that opens and closes an inflow port where fuel flows into a pressurizing chamber. A current flowing to the solenoid (205) is composed of a peak current that imparts momentum for initiating valve closure to the stationary intake valve, and a holding current that switches in a range lower than the maximum value of the peak current to hold the intake valve in a closed state. When the control device (800) reduces a peak current application amount of the peak current from a value sufficient to close the high-pressure fuel pump, the closing speed of the intake valve decreases to a certain application amount, and when the peak current application amount becomes less than a certain application amount, there is a saturation range of the current application amount of the peak current in which the valve closing speed of the intake valve is saturated. The control device (800) controls the current application amount of the peak current so as to fall within the saturation range.

AONO TOSHIHIRO (JP)
MUKAIHARA OSAMU (JP)
TOKUO KENICHIRO (JP)
NAKAI HIROTAKA (JP)
OKI KOTARO (JP)
ARITOMI SHUNSUKE (JP)
MIYAMOTO AKIYASU (JP)

PCT/JP2020/048695

September 02, 2021

December 25, 2020

Click for automatic bibliography generation  

HITACHI ASTEMO LTD (JP)

F02M59/44; F02M59/36

JP2010014109A	2010-01-21
JP2012246852A	2012-12-13
JP2017075609A	2017-04-20
JP2015218656A	2015-12-07
US20110315124A1	2011-12-29

TODA Yuji (JP)

View/Download PDF      PDF Help

Previous Patent: SHUTTER SPEED DETERMINATION DEVICE AND IMAGING DEVICE

Next Patent: PROCESSING DEVICE