초록 ▼

The unevenness of injection rates of cylinders is reduced in a fuel supply system of a direct injection engine which uses a variable-displacement single plunger pump. The unevenness of injection rates of cylinders can be reduced by effecting a control such that the cam100, which drives the high-pres

The unevenness of injection rates of cylinders is reduced in a fuel supply system of a direct injection engine which uses a variable-displacement single plunger pump. The unevenness of injection rates of cylinders can be reduced by effecting a control such that the cam100, which drives the high-pressure fuel pump101, makes one reciprocation, while the engine makes explosions in two cylinders, and by causing the controller55to extend the injection time width of one of two injectors54which inject during one discharge of the high-pressure fuel pump and to shorten the injection time width of the other injector.

대표청구항 ▼

The unevenness of injection rates of cylinders is reduced in a fuel supply system of a direct injection engine which uses a variable-displacement single plunger pump. The unevenness of injection rates of cylinders can be reduced by effecting a control such that the cam100, which drives the high-pres

The unevenness of injection rates of cylinders is reduced in a fuel supply system of a direct injection engine which uses a variable-displacement single plunger pump. The unevenness of injection rates of cylinders can be reduced by effecting a control such that the cam100, which drives the high-pressure fuel pump101, makes one reciprocation, while the engine makes explosions in two cylinders, and by causing the controller55to extend the injection time width of one of two injectors54which inject during one discharge of the high-pressure fuel pump and to shorten the injection time width of the other injector. tromagnet corresponding to said initial position under constant voltage control when the position to which said valve head is moved, represented by the output signal from said displacement sensor, has reached a third displaced position located between said open position and said closed position while said valve head is moving toward said initial position after said alternate energization process has been finished, and then energizing the electromagnet corresponding to said initial position under constant current control when the position to which said valve head is moved has reached a fourth displaced position located closer to said initial position than said third displaced position and near said initial position, thus holding said valve head in the initial position.5. An apparatus according to claim 1, wherein said solenoid-operated valve device has:a displacement sensor for generating an output signal depending on the position to which said valve head is moved;said control means further comprising means for de-energizing one of said valve opening electromagnet and said valve closing electromagnet and thereafter starting to energize the other of said valve opening electromagnet and said valve closing electromagnet from the time when the position to which said valve head is moved, represented by the output signal from said displacement sensor, has reached a first displaced position between said open position and said closed position in said alternate energization process.6. An apparatus according to claim 5, wherein said control means further comprises means for finishing said alternate energization process when the position to which said valve head is moved, represented by the output signal from said displacement sensor, has reached a second displaced position located closer to either one of said open position and said closed position and between said open position and said closed position after said alternate energization process has been started, and, after said alternate energization process is finished, performing a valve seating process to continuously energize one of said valve opening electromagnet and said valve closing electromagnet which corresponds to said initial position in order to keep said valve head in said initial position.7. An apparatus according to claim 6, wherein said control means further comprises means for performing said valve seating process by starting to energize the electromagnet corresponding to said initial position under constant voltage control when the position to which said valve head is moved, represented by the output signal from said displacement sensor, has reached a third displaced position located between said open position and said closed position while said valve head is moving toward said initial position after said alternate energization process has been finished, and then energizing the electromagnet corresponding to said initial position under constant current control when the position to which said valve head is moved has reached a fourth displaced position located closer to said initial position than said third displaced position and near said initial position, thus holding said valve head in the initial position.8. A method of controlling a solenoid-operated valve device having a valve head movable between an open position to open a fluid passage and a closed position to close the fluid passage, an armature of a magnetic material movable in unison with said valve head, a valve opening electromagnet energizable for generating electromagnetic forces to attract said armature in a direction to move said valve head toward said open position, a valve closing electromagnet energizable for generating electromagnetic forces to attract said armature in a direction to move said valve head toward said closed position, and biasing means for biasing said valve head into a neutral position between said open position and said closed position, the arrange