Abstract: A fuel system for a compression ignition engine comprises a fuel injection nozzle including a fuel pressure actuated valve member biased by a spring contained in a chamber. Fuel is supplied through an inlet passage under pressure from a fuel pump. Valve means is provided which can be opened to spill fuel from the pump. A passage conveys the shock wave resulting from the opening of the valve to the chamber to assist closure of the valve member of the nozzle.
Abstract: This invention relates to the injection pumps for internal-combustion engines to which the fuel is supplied by a feed pump and aims at obtaining a speed signal by adjusting the pressure within a chamber (35) closed by the bias of centrifugal masses (18) of the governor (15) associated with the injection pump (11).
Abstract: The invention relates to an injection pump of the piston-distributor type which is mobile with reciprocating and axial rotary motion, and comprises a discharge chamber.Said chamber is maintained at a pressure substantially less than the feed pressure in order to determine rapid stoppage of the engine at the instant of closure of a solenoid valve.
Abstract: A centrifugal governor for adjusting the fuel delivery to an internal combustion engine of the Diesel type is disclosed, wherein centrifugal masses slide along a tubular supporting member and act upon a sleeve, a spring and a slider to govern, through an eccentric-controlled adjustment lever, the rate of flow of the fuel injected into the engine, to reproduce, at will any desired law of variation of the fuel delivery according to the individual requirements of each particular engine.
August 19, 1982
Date of Patent:
July 17, 1984
Manuel Roca-Nierga, Italo Branchetti, Mauro Forapianti
Abstract: A fuel injection system includes a booster for intensifying a supply of fuel from a fuel reservoir and a nozzle needle actuator for operating a fuel injector to start and terminate a fuel injection from the latter. The boosted fuel from the booster is fed not only to the fuel injector but to an upper chamber of the nozzle needle actuator which is defined by a piston. A first hydraulic circuit produces a variable hydraulic fluid pressure for operating the booster in accordance with a predetermined engine operating parameter. A lower chamber also defined by the piston in the nozzle needle actuator is selectively communicated to the first hydraulic circuit by a second hydraulic circuit. The first and second hydraulic circuits share a common source of hydraulic fluid supply which is independent of the fuel reservoir.
Abstract: A throttle body fuel injection system has a pressure regulator which reduces the pressure of the fuel supplied to its electromagnetic injector as the engine induction passage pressure decreases.
September 23, 1982
Date of Patent:
July 10, 1984
General Motors Corporation
David R. Kessler, Noreen L. Mastro, Jerry R. Scheller, George L. Schultz
Abstract: A fuel injection pump for internal combustion engines having an electrical shutoff device is proposed, in which an rpm limitation controlled in accordance with the supply pump pressure in the suction chamber is possible in the event that the failure of the rpm governor or of the annular slide disposed on the pump piston means that the pump work chamber can no longer be relieved in favor of the suction chamber. To this end, a control location dependent in the supply pump pressure in the suction chamber is provided, in the form of a relief slide valve, in a second relief line which leads from the pump work chamber to the suction chamber. The relief slide valve is subjected on one end to the supply pump pressure in the suction chamber and on the other end to the force of a compression spring, and upon the attainment of the maximum permissible rpm limit, the relief slide relieves the pump work chamber, thus automatically enabling a hydraulically controlled rpm limitation.
Abstract: A rugged fuel rail assembly for holding a plurality of electromechanical fuel injector elements in aligned positions on an internal combustion engine. The beam portion of the fuel rail is comprised of two elongated manifold members with overlapping sides brazed together. One of the manifold members has a series of planar sites with apertures for retaining and precisely aligning a plurality of injector cups. To prevent vapor locks the injector cups are mounted with their cavities in close proximity to the inside of the fuel rail. The fuel rail is structurally designed for ease of assembly and to provide adequate rigidity without excessive weight.
Abstract: A canister to be used in the fuel supplying system of an internal combustion engine of a vehicle, is disclosed. The canister is provided with a fuel vapors guiding pipe for guiding the fuel vapors from a fuel vapors inlet port into a bed of adsorbent material accomodated within a housing, and a deflector for deflecting the flow of fuel vapors guided by the guiding pipe so as to be dispersed throughout the bed. The deflector is formed of air-permeable material having a flowing resistance slightly larger than that of the bed into a frusto-conical plate. According to the present invention, one part of the fuel vapors flowing into the bed through the guiding pipe in the fuel vapors adsorbing process flows along the upper surface of the deflector in the direction of the upper portion of the bed and another part of the fuel vapors flows through the deflector in the direction of the lower portion of the bed.
Abstract: A liquid fuel pumping apparatus includes a centrifugal weight mechanism 14 which is coupled to a fuel control member through a lever. A spring is provided to oppose the action of the weight mechanism and this is coupled through a lever having an adjustable pivot point, to the lever through a closure member carried about an axially movable member coupled to the weight mechanism. A drilling in the member is supplied with liquid under pressure at a restricted rate. The pressure of liquid acts upon the closure member to urge the closure member relative to the member so as to uncover a groove communicating with the drilling. The pressure of liquid in the drilling is controlled so that it varies in accordance with the square of the speed and in the event that the pressure fails the closure member and the axially movable member will move relative to each other to cause a reduction in the fuel supplied by the apparatus.
Abstract: A fuel injection pump is proposed in which the quantity adjustment member has a travel limitation device in the form of an adjustable stop, which is adjusted in accordance with the displacement of an adjusting piston in accordance with a contour formed in the jacket face thereon. The displacement of the adjusting piston is effected via rpm-dependent pressure of the suction chamber counter to the force of a restoring spring and counter to a pressure which can be established with the aid of a pressure control valve in accordance with engine operating parameters. The adjustment of the stop is thus effected with the high work capacity of the suction chamber pressure, and the limitation of the adjustment is attained with the aid of the modulated pressure diverted from the suction chamber pressure.
Abstract: The present invention relates to a device for adjusting the injection timing of a distribution-type fuel injection pump for internal combustion engines. In the device of the present invention in which an adjusting piston is moved responsive to the fuel pressure in the high-pressure oil chamber and the resilient force of the timer spring, and the roller ring is rotated following the movement of the adjusting piston, the improvement comprises a cylinder which is provided in addition to a cylinder that accommodates the adjusting piston, and a shaft which slides in the above cylinder separately from the adjusting piston, so that the position of the adjusting piston can be adjusted by the shaft. The device employs sliding portions that do not require strict machining precision. Further, when the fuel injection pump is to be mounted on the engine, the initial timing can be easily adjusted through manipulation effected from the outer side of the fuel injection pump.
Abstract: The disclosure illustrates an electronically controlled fuel pump in which a bypass valve regulates its output pressure to a predetermined level above a control pressure. A downstream throttling valve re-regulates the pressure to a predetermined level below a control pressure. The control pressure is established by an electro-hydraulic valve which is, in turn, fed with signals with a microprocessor to provide appropriate control. The use of the control pressure in effect causes a servo action and utilizes the pressure of the fuel to manipulate the valve and minimize the power requirement of the electro-hydraulic valve.
Abstract: The invention relates to an arrangement for increasing the idling speed of an internal combustion engine, particularly a diesel internal-combustion engine. It has a setting member for controlling the feed of the fuel, the displacement path of said member being adapted to be limited in the direction towards idle by an idle stop and after a starting process, by a start-quantity stop. In order that such an arrangement be of simple construction and be capable of being manufactured inexpensively, the displacement path can be limited by a plurality of start-quantity stops arranged one behind the other in the idling direction, of which, commencing with the starting process, at given time intervals one after the other, the start-quantity stop furthest from the idle stop can be moved out of the path of displacement of the setting member.
April 1, 1983
Date of Patent:
May 29, 1984
VDO Adolf Schindling AG
Wolfgang Sauerschell, Stephan Wietschorke, Gerhard Ruschek
Abstract: Intake fuel supplied to a conditioning tank is mixed therein with engine heated fuel returned from a fuel injector to which mixed fuel from the tank is fed. The mixed fuel in the conditioning tank is degassed by atmospheric venting through a hydrostatic liquid column rising to a level above the conditioning tank.
Abstract: A distribution type fuel injection pump for distributing and pumping a fuel into a plurality of cylinders of an internal combustion engine. The fuel injection pump is constructed of a hydraulic head formed with first and second fuel feed ports, a rotor fitted in the hydraulic head, and plungers fitted in the end portion of the rotor for effecting the pumping action in accordance with the rotations of the rotor. Separately of this rotor, there is formed in the hydraulic head, for example, a pressure space in which a shuttle is slidably fitted to partition the pressure chamber into first and second pressure chambers. The fuel, introduced from the first fuel feed port and compressed by the plungers, is guided into the first pressure chamber of said pressure space in accordance with the rotation of the rotor, and the fuel, is introduced into the second pressure chamber, is consecutively distributed and pumped into the respective engine chambers by the movements of the shuttle.
Abstract: A fuel injection pump (100) including a plunger (2) and a piston (1) movably disposed in a pumping chamber (17), means for initiating (3, 5) fuel injection and means for terminating (13, 20, 29) fuel injection, the plunger periodically pressurizing fuel in a pressure chamber (44) and the piston (1) spaced from the plunger and allowing a metering chamber (16) to fill with a metered quantity of fuel to be injected to an engine. The means for initiating injection comprises a pilot valve (5) having a solenoid to selectively operate between either of two states and a control valve (3) movable between first and second positions in response to the state of pilot valve (5), the first position filling the metering chamber (16) with the metered quantity of fuel. The pilot valve (5) determines the fuel quantity to be delivered to the engine relative to a signal from an electronic controller. An accumulator (4) is pressurized during each cycle of the plunger (2) to provide pressurized fuel during a metering phase.
Abstract: A diaphragm (38) controls a position of a control sleeve (14) relative to a plunger or piston (16) in response to a pressure differential between a pressure chamber (42) and a control chamber (46) which are defined by the diaphragm (38). The pressure chamber (42) is communicated to an atmospheric pressure or a boost pressure while the control chamber (46) is selectively communicated to a source of vacuum supply through a first check valve (62) and to the atmosphere through a second check valve (58). The first and second check valves open when the pressure inside the control chamber is higher and lower than a reference level, respectively, thereby maintaining the pressure within the control chamber (46) substantially at the reference level to promote an accurate control of the control sleeve (14).
Abstract: Several embodiments of internal combustion engines offering improved performance in the form of improved fuel economy and reduction in the emission of unwanted exhaust gas constituents at idle and low speed operation. In each embodiment, an induction system is employed using a main intake passage and a sub-intake passage, each of which communicates with the combustion chamber through a respective port. The sub-intake passage has a substantially smaller cross-sectional area than the main intake passage so that a given mass flow through this passage will enter the combustion chamber at a higher velocity than that flowing through the main intake passage. Throttle valve means are provided for sequentially controlling the flow into the combustion chamber through the main and sub-intake passages.