HYDRAULIC-DRIVE FUEL INJECTION DEVICE AND INTERNAL COMBUSTION ENGINE

摘要

The purpose of the present invention is to shorten heat receiving time that corresponds to a shortening in fuel injection time and to make a fuel injection pressure mode after a prescribed amount of time has passed since the start of fuel injection to become an injection mode with a high rate of increase in injection pressure. Provided are the following: a first electromagnetic valve (34) that controls the opening and closing of an open-side logic valve (31) that governs the supply of operating oil to a pressurization device (6) that increases operating oil pressure through a pressurization piston (22) and transmits such pressure to a plunger (4) of a fuel injection pump (1) and of an closed-side logic valve (32) that governs the discharge of operating oil from the pressurization device (6)respectively; a second electromagnetic valve (35) that controls the opening and closing of an open-side logic valve (71) that governs the supply of operating oil to the pressurization device (6); and a controller that controls the opening and closing of the electromagnetic valves (34, 35). The controller controls the opening and closing timing of the electromagnetic valves (34, 35) and adjusts the lift of the electromagnetic valves (34, 35) so that the injection pressure of the fuel injected from the fuel injection pump (1) reaches a desired fuel injection pressure.