32 results about "Unit injector" patented technology

A control device for an engine, which includes a plurality of cylinders, an electronically controlled unit injector for injecting fuel into each cylinder, and an electronically controlled valve train for opening and closing an intake valve and an exhaust valve of each cylinder, comprises operating state detection means for detecting the operating state of the engine, and electronic control units for performing an idle cut operation, in which fuel injection into some of the cylinders is stopped, and the intake valve and the exhaust valve of the cylinder concerned are kept closed, if the signal switching time is long when the idling of the engine of a vehicle waiting at traffic lights is detected by the operating state detection means.

An apparatus and method for varying the duration of current levels of a fuel injection signal used in connection with an electronically controlled hydraulic actuator unit injector fuel system is disclosed. The apparatus and method varies the duration of the pull-in current of the fuel injection signal delivered to the unit injector based on sensed engine parameters, which preferably include a sensed temperature of the engine and engine speed.

A unit injector assembly is provided that helps to ensure maximum injection flow while minimizing the harmful affects of pressure waves within the unit injector assembly. The unit injector assembly has a first fuel passageway extending from the plunger piston pumping chamber to the tip check stem injection chamber and valve seat. The unit injector assembly has a second fuel passageway extending from the tip check stem injection chamber to a fuel control valve assembly. A flow restricting fuel passageway connects one of the pumping chamber and the first fuel passageway with the second fuel passageway and acts to minimize cavitation at the valve seat and effectively eliminates pressure waves within the unit injector assembly.

An apparatus and method for varying the current levels of a fuel injection signal used in connection with an electronically controlled hydraulic actuator unit injector fuel system is disclosed. The apparatus and method varies the current level of the fuel injection signal delivered to the unit injector based on sensed engine parameters, which preferably include a sensed pressure of hydraulic actuating fluid and a sensed temperature of the engine.

A method to control an injection pressure level of fuel within a unit injector is provided. The method includes provision of a second spill valve in the unit injector, which is connected in parallel to a first spill valve. The fuel is delivered to the unit injector with the first spill valve maintained in a passive state. This facilitates return of the first portion of the fuel to the low-pressure fuel manifold. The first spill valve is actuated to an active state to block the flow of fuel to the low-pressure fuel manifold, to maintain the unit injector at the injection pressure level. The second spill valve is actuated concurrently or prior to the actuation of the first spill valve. This facilitates return of a second portion of the fuel to the low-pressure fuel manifold. This is done to limit the injection pressure level within the unit injector.

The invention involves a circulating fluidized bed boiler and its circle of contact burning method, the boiler consists essentially of boiler body and wind-forming plate, the wind-forming plate is installed below the boiler body, its structural characteristics are: two or more sets of injector device are installed below the dense phase area of boiler body, each set of injector device consists of four injectors which are both installed on the four corners of boiler body horizontal section separately, the injectors of bottom injector device are installed horizontally, and the injector device in other layers inclined toward down 5: . In the same horizontal surface, the central line of one unit injectors installed on four corners forms a circle of contact in the furnace tank, and the secondary wind or steam ejected out each injector device form a circle of contact air flow. The invention has the advantages of reasonable structural design, adequate fuel combustion, coal-saving, efficient, effective oxygen supplementary capacity improving through second wind energy, higher filling degree of furnace tank and full fuel combustion.

A common rail single fluid injection system includes fuel injectors ramp shaped injection curves at both the front and back ends of an injection event. This is accomplished by including a check speed control device fixed in position within the check control chamber of a fuel injector. The check speed control device controls the speed of a check by restricting fuel flowing into and out of the check control chamber.

A gasoline unit injector includes a high speed, high force actuator such as a magnetrostrictive or piezoelectric actuator. The actuator operates a positive displacement diaphragm pump. The pumping volume is isolated from a supply rail by an inlet check valve, and is isolated from the engine manifold by an outlet check valve. Each of the check valves includes a disk having a central anchor and a peripheral valve seat. Diaphragm movement reduces pump volume and thereby displaces fuel at high pressure through outlet valve. Fuel spray is formed by geometry of outlet valve, the frequency of actuation, and mass and pressure of the displaced fuel. Relaxation of actuator, and therefore diaphragm, increases pump volume and thereby draws fuel into pump volume through the check valve.

A flow regulating valve for a diesel engine in which a unitary valve element has three positions for controlling flow from a unit injector fuel injection system in response to valve inlet pressure. The valve has a first position wherein flow is blocked below about 10 psi, a second position between about 10 psi and 20 psi wherein flow is substantially unrestricted, and a third position above about 20 psi wherein flow is restricted to minimize return flow to a fuel supply and minimize fuel cooling requirements.

The invention belongs to the technical field of withdrawal tools, and particularly relates to a withdrawal tool of an oil injector needle valve, which comprises an oil injector without a nozzle, and a shaft sleeve, wherein one end of the shaft sleeve is connected with the head part of the oil injector without the nozzle, the other end of the shaft sleeve is screwed with a fixed pin, a fixed sleeve inside which a nozzle can be arranged is screwed on the end part of an outlet of the oil injector without the nozzle in the shaft sleeve, and a threaded coupling and an oil return joint are arranged on the tail part of the oil injector without the nozzle. According to the invention, the needle valve can be completely withdrawn without any physical knocking in the whole withdrawal process, and the nozzle can not be damaged. Meanwhile, the withdrawal tool has the advantages of simpleness in operation, convenience for use, greatly increased working efficiency and low manufacture cost.

The invention discloses a main machine structure of a simulation test machine for evaluating the blocking ratio of the electronically-controlled oil injector of a gasoline engine. A simulation test device is used for detecting at least one electronically-controlled oil injector and comprises a nitrogen pressure regulating device, a fuel oil storage device, a fuel oil distributor, a heating deviceand a measuring device, wherein the fuel oil storage device is connected with the nitrogen pressure regulating device; the fuel oil distributor is communicated with the fuel oil storage device; the lower end surface of the fuel oil distributor is connected with the electronically-controlled oil injector; the heating device is used for heating a needle valve part of the electronically-controlled oil injector and measuring the temperature of the electronically-controlled oil injector; and the measuring device is arranged below the electronically-controlled oil injector and used for accommodatinga liquid injected from the electronically-controlled oil injector and measuring the amount of the liquid. Through the adoption of the simulation test device, the blockage tendency of the electronically-controlled oil injector can be judged by measuring the amount of the liquid flowing out from the electronically-controlled oil injector, thereby realizing long-time automatic detection on the electronically-controlled oil injector. The simulation test device can be filled with gasoline or a cleaning fluid, so that multiple functions are achieved.

A fuel conditioning method is applicable to common rail direct injection or unit injector system. A liquid fuel is conditioned for higher-efficiency combustion in a combustion chamber. The conditioning system includes a fuel vessel (6) for fuel conditioning, at least one fuel dispersing nozzle (5) mounted for discharge into the fuel conditioning vessel (6), at least one gas inlet port (12), and at least one conditioned fuel outlet port (13) located in the vessel. A gas source (9) feeds a gas to the fuel conditioning vessel (6), wherein the gas is dissolved in the liquid fuel for forming a liquid / gas fuel solution. A low-pressure fuel pump (3) and a liquid fuel supply line (4) deliver liquid fuel from a fuel tank (1) to the at least one dispersing nozzle (5) of the fuel vessel (6) at pressure P1 higher than the gas pressure P2. A high-pressure fuel pump (14) feeds the liquid fuel / gas solution into a common rail (16) and further into fuel injectors (18), providing a pressure P4 higher than a pressure P5 in the combustion chamber at a moment of combustion.

Present invention relates to an embedded unit injector including outer case, one-way valve, jet orifice plate and partition. It features in middle of jet orifice plate at least embedded a piece of restrictor plate, at least a micro interstice set between jet orifice plate and restrictor plate, said micro interstice is fuel injection hole, outer case oil outlet opposite with jet orifice plate fuel injection hole, jet orifice plate fuel injection hole opposite with partition through fuel hole, partition through fuel hole opposite with one-way valve. Said invention also refers to a embedded unit injector, one end in one-way valve oil inlet set with square opening vertical with fuel inlet channel, one end of one-way valve oil inlet vertical connected with valve body of oil pressure adjusting valve, square opening located upper of said communicated with oil pressure adjusting valve. It has simple structure, convenient for manufacture, precision controlling fuel feed, saving fuel, in time adjusting fuel injection pressure, raising fuel atomization quality.

A method in an internal combustion engine for controlling a fuel injector of the unit injector type which includes a plunger that is driven by a rotating camshaft and during a working stroke generates a hydraulic pressure increase in the fuel. Pressure build-up is regulated by a spill valve the injection sequence is regulated by a needle control valve. The spill valve and the needle control valve are regulated in such a way that additional plunger retardation force is produced in a part of a working stroke in addition to the normal retardation force that is produced by the plunger return spring and the flow resistance in the injector.

A common rail single fluid injection system including fuel injectors with the ability to produce multiple injection rate shapes. This is accomplished by including auxiliary filling orifices which selectively provide pressurized fluid to the check needle control chamber during injection events. In so doing, the speed and movement of the check needle is manipulated and differing injection rates may be achieved.

The invention relates to a unit injector system for supplying the combustion chamber of a self-igniting internal combustion engine with fuel. The unit injector system has a high-pressure chamber that can be subjected to pressure via a pump piston. A storage piston is received inside a storage chamber and is acted upon via a compression spring disposed in a spring holder. A return flow throttle element, which delays the buildup of pressure in the storage chamber, is disposed between the high pressure chamber and the storage chamber of the storage piston.

A modified barrel device (1) and method of retarding injection timing of EMD-type unit injectors by a desired amount of crank degrees includes the steps of providing a modified pump barrel (8) whose port locations differ, in their spacing from the top shoulder of the associated barrel, that corresponds to the spacing from the top face of the associated follower, from the spacing of the barrel port sealing location of the pump barrel of the original injector from the top shoulder of the associated barrel, that corresponds to the top face of the associated follower (2), such difference in spacing being by an amount equal to the amount of retardation, in linear units, that corresponds to the desired amount of retardation in crank degrees, and assembling the modified pump barrel (8) into an injector assembly.

A modified pump follower device (2) and method of retarding injection timing of EMD-type unit injectors by a desired amount of crank degrees includes the steps of providing a modified pump follower (2) whose plunger engagement location, also known as t-slot (7), varies depending on the desired amount of retarding. Specifically, the modified pump follower (2) has a t-slot (7) which has a predetermined distance t′ on the modified pump follower (2), as compared to conventional pump followers having a predetermined distance t, such that the t-slot (14) is closer to the top face (9) of the pump follower (2). The difference in spacing between the original timing t and the retarded timing t′ is r, which is an amount equal to the amount of retardation, in linear units, that corresponds to the desired amount of retardation in crank degrees.

A fuel conditioning system is applied to common rail direct injection or unit injector diesel engines. A liquid fuel is conditioned with gas for combustion in the combustion chambers. The system includes an elongate conditioning vessel, at least one fuel dispensing inlet, at least one carbon dioxide inlet port, and at least one conditioned fuel outlet port on the vessel. Carbon dioxide and diesel fuel are fed into the inlet portion of the vessel. The mixture travels a path of at least ten feet in the vessel to the outlet portion to cause the carbon dioxide gas to dissolve in the liquid fuel for forming a liquid / gas fuel solution. At least one high-pressure fuel pump feeds the liquid fuel / gas solution into fuel injectors.

The invention relates to an opposed hydraulic free piston engine with a hydraulic synchronizing mechanism and a driving method of the opposed hydraulic free piston engine. The opposed free piston engine comprises a high-pressure working medium liquid path, a low-pressure working medium liquid path, an electronic control unit, an oil sprayer, a gas inlet, an exhaust opening, a first cylinder sleeve, a second cylinder sleeve, a first piston matched with the first cylinder sleeve, a first piston rod connected with the first piston, a first high-pressure working medium output cavity connected withthe other end of the first piston rod, a second piston matched with the second cylinder sleeve, a second piston rod connected with the second piston, a second high-pressure working medium output cavity connected with the other end of the second piston rod, a high-pressure working medium liquid path, and the hydraulic synchronizing mechanism, wherein the first cylinder sleeve and the a second cylinder sleeve are coaxial and symmetrically distributed According to the opposed hydraulic free piston engine with the hydraulic synchronizing mechanism and the driving method of the opposed hydraulic free piston engine, a first synchronizing cavity and a fourth synchronizing cavity of the hydraulic synchronizing mechanism communicate, and a second synchronizing cavity and a third synchronizing cavity communicate, so that two synchronizing loops are formed; and due to the property that a liquid working medium is difficult to compress, mutual containing and mutual restraining are achieved, and the pistons on the two sides can synchronously move.

A hydraulically actuated servo piston and hydraulic advance piston are integrated into the cam follower of a unit pump or injector to provide variable advance for an injection event produced by the pump or injector. The servo piston is nested in the advance piston with fluid passageways in the advance piston selectively opened or closed by movement of the servo piston. The full pressure of a hydraulic pump is available to the advance piston for powering the advance function, while stepwise reduced levels of hydraulic pressure from the same hydraulic pump are applied to control movement of the servo piston. A damping orifice restricts flow of hydraulic fluid to and from the servo piston.

An auto oil injector cleaning connector is classified into the mechanical engineering part according to the international patent classification (IPC). The auto oil injector cleaning connector is characterized in that: a stainless steel container is canceled on the basis of the original tool, which saves cost and material; when a factory produces an oil injector cleaning agent, a disposable sealing valve can be adopted without increasing the cost and transportation and storage are safer compared with a previous product; and the product is directly mounted on the auto oil injector cleaning connector, the cleaning agent does not need to be poured into the container, operation procedures are reduced and therefore safety, speed and strong practicability are promoted. The auto oil injector cleaning connector is simple to manufacture and has low cost. The auto oil injector cleaning connector comprises three parts of a valve seat, a valve core and a needle valve. The front end of the valve core is proved with a connecting thread of the oil injector cleaning agent product. An air inlet passage and the solution outlet are separated up and down. The air inlet passage is provided with a sealing hole. The front end of the needle valve can open the oil injector cleaning agent product to have the valve sealed, and the rear end of the needle valve seals the air inlet passage. Air through the air inlet passage of the needle valve is pressed into an oil injector cleaning agent tank. Air pressure makes the oil injector cleaning agent flow out from the solution outlet. During the whole cleaning process, an engine runs smoothly and operation is completed in one time and the connector can be promoted.