Patent ID: 7415972
Filing Date: 2008-08-26
Classification: F02M

Abstract:
1. A fuel injection apparatus for engines, the apparatus comprising: a plurality of high pressure fuel pumps that supply high pressure fuel to a common rail by compressing fuel introduced in each of a plurality of plunger rooms of the plurality of high pressure fuel pumps by each respective plunger reciprocated by respective fuel cams, the high pressure fuel accumulated in the common rail being injected into each of a plurality of engine cylinders at a controlled injection timing; and a fuel supply amount adjusting device that provides fuel feed passages for feeding fuel to the plurality of plunger rooms, said fuel supply amount adjusting device including (i) a spool valve device that varies an opening area of each of the fuel feed passages for introducing fuel into each of the plurality of plunger rooms by sliding a spool fitted slidably in a spool valve case, (ii) a spool drive device having an electromagnetic actuator that slides the spool, and (iii) a controller that controls the spool drive device to actuate the spool valve device so that the opening area of the fuel feed passages is increased or decreased based on changes in engine load.