Abstract: A liquefied gas fuel filling system provided with a filling and pressure-balanced receptacle at a vehicle side combined with a filling and pressure-balanced nozzle at a station side connected with a storage tank, and an excess flow prevention valve provided in a pressure-balanced line for making the filling and pressure-balanced receptacle and a gas-phase region of a fuel tank contact each other. An orifice is provided in a pressure-balanced receptacle of the filling and pressure-balanced receptacle, thereby enabling the fuel tank to be smoothly filled with liquefied gas even when the outside air temperature rises.

Abstract: To provide an injector nozzle that enables the increase in the maximum injection rate of fuel. An injector nozzle 1 has a sac portion 21 for storing a fuel which is formed in a distal end portion of a nozzle body 2 and in which injection holes 11 for injecting the stored fuel are formed; and, a seat portion 22 which is formed at a proximal end side of the sac portion 21 and in which a needle valve 3 for closing the sac portion 21 can be seated. The needle 3 valve has a distal end portion which is tapered towards the distal side and which is formed by cutting off a portion located on the distal side beyond an abutment position where the seat portion can be contacted.

Abstract: The object of the present invention is to provide a camless valve driving device, without having a cam mechanism, which can reduce the valve driving energy and enhances fuel efficiency. According to the one preferred aspect of the present invention, the valve driving device of an internal combustion engine includes a pressure chamber, to which actuating fluid, to drive opening and closing of a main valve serving as an intake valve or as an exhaust valve of the internal combustion engine, is supplied; a first actuating valve for supplying high-pressure (Pc) actuating fluid to the pressure chamber during a prescribed period (tCP1) of the initial valve opening period of the main valve; a second actuating valve for introducing low-pressure (Pf) actuating fluid to the pressure chamber after the prescribed period (tCP1) has elapsed; a third actuating valve for discharging actuating fluid from the pressure chamber when the main valve is closed.

Abstract: An object of the present invention is to obtain a consistently stable needle lift damping effect in an injector 8b for fuel injection. In an injector 8b that relieves fuel pressure inside a pressure control chamber 37 and lifts a needle valve 36, there are provided a damper member 62 that is slidably mounted to the needle valve 36, a damping chamber 63 formed between the damper member 62 and the needle valve 36, a leak passage 64 for extracting and leaking out the fuel in the damping chamber 63, and a stopper member 41 to restrict the lift position of the damper member 62. Damping of the lift of the needle valve 36 is carried out by extracting and leaking out the fuel in the damping chamber 63 through the leak passage 64. The needle valve 36 functions as a guide for the damper member 62, and prevents vibration of the damper member 62, allowing a consistently stable damping effect to be obtained.

Abstract: The object of the present invention is to provide a camless valve driving device, without having a cam mechanism, which can reduce the valve driving energy and enhances fuel efficiency. According to the one preferred aspect of the present invention, the valve driving device of an internal combustion engine includes a pressure chamber (18), to which actuating fluid, to drive opening and closing of a main valve (11) serving as an intake valve or as an exhaust valve of the internal combustion engine, is supplied; a first actuating valve (20) for supplying high-pressure (Pc) actuating fluid to the pressure chamber (18) during a prescribed period (tCP1) of the initial valve opening period of the main valve; a second actuating valve (34) for introducing low-pressure (Pf) actuating fluid to the pressure chamber (18) after the prescribed period (tCP1) has elapsed; a third actuating valve (30) for discharging actuating fluid from the pressure chamber (18) when the main valve (11) is closed.

Abstract: Disclosed a common-rail, fuel-injection system in which an actual quantity of fuel injected is found in consideration for a quantity of dynamic fuel leakage, thereby making it possible to inject a desired quantity of fuel per cycle in accordance with the engine operating conditions. A quantity of fuel to be supplied from the common rail is found from a first mapped data defined previously, in conformity with a common-rail pressure Pch and a difference &Dgr;Pc in pressure taking place between the common-rail pressures just before and after the fuel injection. Moreover, a quantity of dynamic fuel leakage is found from a second mapped data defined previously, in conformity with a common-rail pressure Pch just before the fuel injection and a command-pulse width for controlling the fuel injection.

Abstract: Disclosed a common-rail fuel-injection system employing an auxiliary injection such as a pilot injection system, in which when a desired amount of fuel to be injected in the auxiliary injection is less than a set value, the feedback control ceases to keep the combustion against becoming unstable. When a desired amount of fuel to be injected in the auxiliary injection is proved on comparison at step 15 to be less than a minimum amount of fuel injected, which is the lower limit detectable according to both of the common-rail pressure and a pressure drop in the common-rail pressure owing to the fuel injection, the minimum amount of fuel injected serves on step 18 as a corrected, desired amount of fuel to be injected in the auxiliary injection. Thus, the fuel injection is achieved in accordance with the corrected, desired amount of fuel to be injected in the auxiliary injection, thereby keeping the feedback control at the auxiliary injection from becoming unstable.

Abstract: A piezoelectric actuator is disclosed, wherein a superposing pulse is generated just after a command pulse falls to thereby reduce oscillations of displacement in piezoelectric elements. In the piezoelectric actuator, an exciting pulse having a preselected pulse width is applied across terminals of the piezoelectric elements to cause strains in dimension for the piezoelectric elements. A pulse is superposed such that it is superposed at a timing a at which the exciting pulse is turned on, and then the exciting pulse is once turned off for a minute length of time, or an interval between b and b', and turned on again at c. The pulse to be superposed is supplied with a timing less than one-fourth a period of an oscillation of the piezoelectric elements. The piezoelectric actuator is effective to prevent the resonance phenomenon and preferably employed for the fuel-injection apparatus.

Abstract: In the fuel injection method and device for engines, information obtained from the differential value of the common rail pressure is used to correct the parameters of the command pulses to the flow control valve and the solenoid valve of each injector and thereby limit deviations of the fuel injection characteristic of the injector from the target injection characteristic. From the curves of the differential values R of the common rail pressure Pc, the actual fuel injection parameters for the injectors-injection start timing Tis, gross injection amount Qt, initial injection amount Qe and maximum injection rate Rmax-are obtained.