A fuel injection valve (10) comprises an intermediate valve with a mushroom-shaped intermediate valve member (78). The shaft (76) of the intermediate valve member (78) is guided with a sliding fit in the guiding passage (74) of an intermediate component (66). An annular space (120) is defined between the shaft (76) and the head (80) of the intermediate valve member (78) and the intermediate component (66), and a high-pressure inlet (86) opens into the annular space, which is formed by an inner annular space (108) and by a split ring space (118). The split ring space (118) is defined between the head (80) and the intermediate component (66), and is also radially outwardly defined by a sealing bead (112). The adhesion force between the intermediate valve member (78) and the intermediate component (66), which acts against the opening motion of the injection valve member (56), is minimized.

An injector is designed to provide continuously variable injection rate shaping. With a hydro-mechanical internal feedback mechanism, injector needle position can be determined by controlling a feedback valve's on/off timing. According to the needle position, an injection needle valve opening can be controlled, and then the injection flow rate can be delivered proportionally. Also in accordance with the present invention a CRDI systems are provided including injectors of the present invention, wherein results demonstrate that injector designs of the present invention not only achieve rate shaping capability but also solve the above-noted problems of the current CRDI system. Finally, an iterative learning controller has also been developed to track the desired injection rate, and an injection rate estimator is designed to realize a cycle to cycle feedback control.

The invention relates to a fuel injection valve, comprising a nozzle body (1) and a pressure chamber (3) formed therein, wherein the pressure chamber (3) can be filled with fuel under high pressure and wherein a piston-shaped nozzle needle (5) is arranged in the pressure chamber so as to be movable longitudinally, which nozzle needle interacts with a nozzle seat (7) formed in the nozzle body (1) by means of a sealing surface (6) formed at the end of the nozzle needle on the combustion chamber side and thereby controls the flow of fuel from the pressure chamber (3) to at least one injection opening (8). A sleeve (12) accommodates the end of the nozzle needle (5) facing away from the nozzle seat and bounds a control chamber (20). By means of the pressure of the control chamber, a hydraulic force is applied to the nozzle needle (5) in the direction of the nozzle seat (7). A closing spring (16) is arranged in the control chamber (20). The closing spring is arranged between the sleeve (12) and the nozzle needle (5) under compressive preload.

A fuel injector includes a control valve assembly arranged between an actuator assembly and a nozzle assembly. A 3-way valve controls flow for filling or draining a control chamber through a first throttle and through a second throttle for enabling or preventing fuel injection. The second throttle is a through orifice provided in a plate arranged in the control chamber.

A fuel injection valve includes a needle valve that controls communication between a high pressure chamber and an injection hole, a follower valve provided inside a control chamber controlled by fuel pressure inside an intermediate chamber, and an open-close valve that controls communication between a first passage and a low pressure passage and communication between a second passage and the low pressure passage. The fuel injection valve is configured to control the gradient of the fuel injection rate from the injection hole with an improved configuration.

A fuel injector includes a control valve assembly arranged between an actuator assembly and a nozzle assembly. A 3-way valve controls flow for filling or draining a control chamber through a first throttle and through a second throttle for enabling or preventing fuel injection. The second throttle is a through orifice provided in a plate arranged in the control chamber.

A fuel injection device is provided with a valve body, a nozzle needle, a movable plate, and a support spring. The valve body has a control chamber therein. The control chamber is defined by a defining wall which has a dividing wall portion. The dividing wall portion divides the control chamber into an accommodation chamber and a backpressure chamber. The accommodation chamber accommodates a movable plate and a support spring. A fuel pressure in the backpressure chamber is applied to the nozzle needle. The dividing wall portion has a restriction hole fluidly connecting the accommodation chamber and the backpressure chamber with each other, and a support surface supporting the support spring.

A fuel injector for delivering fuel to an internal combustion engine includes a nozzle having a valve needle which is movable with respect to a valve needle seat. The valve needle travels through a range of movement between a closed position and an open position to control fuel delivery through at least one nozzle outlet. The valve needle cooperates with a needle sleeve or a control member which is located in a piston guide. The valve needle is movable relative to the needle sleeve or the control member. The needle sleeve or the control member is movable relative to the piston guide.

A nozzle assembly of a dual fuel injector includes a first fuel conduit and a second fuel conduit. An anti-leakage feature of the nozzle assembly includes a cylindrical tubular sleeve axially extending in an inner space of the nozzle body from an upper end attached to the body to a distant lower end, the outer valve member being axially guided through said sleeve.

A control valve arrangement includes a valve body with a filling chamber with a filling hole. A filling valve is arranged in the filling chamber for opening or closing a first fluid communication controlling filling of a first control chamber, the filling valve having a filling valve member with a moving valve seat, the filling valve member being normally biased open by a first spring. A control valve opens and closes a second fluid communication for controlling the emptying of the first control chamber, the control valve being normally biased closed by a second spring. A plug is arranged in the valve body for closing the filling chamber, the plug being provided with an opening which cooperates with the moving valve seat, the opening defining the first fluid communication between the filling chamber and the first control chamber.