公开(公告)号：US3625638A

公开(公告)日：1971-12-07

申请号：US3625638D

申请日：1970-02-12

Applicant: BOSCH GMBH ROBERT

Inventor： KOSTER CLAUS ,  NOTHDURFT HEINZ ,  STAMM HARALD

IPC: F02M41/12 ,  F04B49/00

CPC classification number: F02M41/127 ,  F02M41/128 ,  Y10T137/7847

Abstract: In a fuel injection pump, the delivery of additional fuel quantities required for the starting operation is cut off and the timing of the injection is regulated by the r.p.m.-dependent pressure prevailing in the suction chamber of the fuel injection pump and generated by a feed pump driven by the engine. Said pressure is regulated by a control device disposed in a bypass or return conduit connecting said suction chamber with the suction side of said feed pump. For low r.p.m.''s, said control device maintains open a minimum flow passage section which is enlarged for higher r.p.m.''s. Thus, for a range of low r.p.m.''s, the pressure increase in the suction chamber in response to the r.p.m. increase is significant, while beyond said range, said response is only slight.

公开(公告)号：US3699939A

公开(公告)日：1972-10-24

申请号：US3699939D

申请日：1970-06-08

Applicant: BOSCH GMBH ROBERT

Inventor： ECKERT KONRAD ,  EHEIM FRANZ ,  HOFER GERALD ,  KOSTER CLAUS

IPC: F02M41/08 ,  F02M41/12 ,  F02D1/04

CPC classification number: F02M41/127

Abstract: In a fuel injection pump, in order to prolong the duration of fuel injection during each pressure stroke of the pump piston in the idling or low load rpm range, there is provided a bypass channel extending from the pump work chamber for continuously discharging part of the fuel displaced by the pump piston. Said bypass channel contains a valve means which closes the bypass channel when the engine rpm exceeds the idling or low load rpm range.