초록 ▼

A fuel injection system for a diesel engine has fuel pump driven by the engine for producing highly pressurized fuel, a common rail for storing the pressurized fuel therein and injection nozzles for injecting the pressurized fuel stored in the common rail into the engine. The injection nozzles are e

A fuel injection system for a diesel engine has fuel pump driven by the engine for producing highly pressurized fuel, a common rail for storing the pressurized fuel therein and injection nozzles for injecting the pressurized fuel stored in the common rail into the engine. The injection nozzles are electrically controlled in accordance with engine operating conditions (N, a

대표청구항 ▼

A fuel injection system for a diesel engine comprising: condition detection means for detecting operating conditions of said diesel engine including a rotational position thereof; low pressure fuel supply means for supplying fuel at a low pressure at an output port thereof; high pressure fuel pump m

A fuel injection system for a diesel engine comprising: condition detection means for detecting operating conditions of said diesel engine including a rotational position thereof; low pressure fuel supply means for supplying fuel at a low pressure at an output port thereof; high pressure fuel pump means, having a pump chamber communicating with said output port of said low pressure fuel supply means, and plunger means reciprocable within said pump chamber for introducing fuel from said output port of said low pressure fuel supply means into said pump chamber during a movement in a predetermined direction of said plunger means and for pressurizing the introduced fuel during a movement of said plunger means in the opposite direction so that pressurized fuel is delivered from said high pressure fuel pump means at an output port thereof; common rail fuel storage means, connected to said output port of said high pressure fuel pump means, for storing pressurized fuel delivered from said high pressure pump therein at a substantially continuous pressure; fuel injection means, connected to said common rail fuel storage means and including en electrically-controlled valve, for injecting the pressurized fuel stored in said common rail fuel storage means into said diesel engine, when activated by an injection control signal; spill passage means for communicating said pump chamber to said low pressure fuel supply means; electrically-controlled spill valve means, which is normally open and positioned in said spill passage means, for closing said spill passage means in response to a spill control signal applied thereto; and electric control means for producing said injection control signal and said spill control signal, a time period of said injection control signal being determined in accordance with the detected operating conditions of said diesel engine, and said spill control signal being started at a fixed predetermined rotational position of said diesel engine, and ending at a variable time, so that said spill valve means closes said spill passage before said high pressure pump means starts said fuel pressurizing during the movement of said plunger means in said opposite direction and opens the spill passage means in the course of the movement of said plunger means in said opposite direction thereby to maintain the fuel pressure in said fuel storage means.