Abstract: An automotive engine has a purge system for purging fuel vapor in a canister to an intake passage of the engine, and a learning control system. Fuel injection pulse width is determined by using a learning coefficient derived from learning memory. The learning memory stores a plurality of learning coefficients which are updated with change of characteristics of elements of the engine. When the purge starts, the learning coefficients stored in the learning memory are stored in an updating memory as updating coefficients. When the purge is cut off, the learning coefficients in the learning memory are updated with updating coefficients in the updating memory.

Abstract: A fuel injection apparatus for an internal combustion engine and comprising a fuel injection pump, a fuel delivery pump for communicating fuel from a fuel tank to the suction chamber of the fuel injection pump, and cut-off device for cutting off the fuel flow to the injection nozzles of the internal combustion engine in case of a disturbance, said cut-off device comprising a spring-loaded accumulator connected with the suction chamber of the fuel injection pump and an electromagnetically actuated control valve for effecting a rapid cut-off, said control valve communicating the outlet of the delivery pump with the fuel tank in case of a disturbance, whereby the accumulator provides for reduction of pressure in the suction chamber of the fuel injection pump so that fuel does not flow to the internal combustion engine.

Abstract: A pump nozzle for a diesel engine, in which an injection pump element including a pump piston driven by a cam-shaft via a thrust element and a pump element bushing is combined with an injection nozzle to provide a unit to be associated to one motor cylinder. The pump piston is surrounded by a control sleeve which is non-rotatable relative to the pump element busing. The pump piston can be rotated for adjusting its orientation relative to the control sleeve for the purpose of adjusting the supplied amount of fuel. An adjuster for adjusting the amount is disposed at substantially the same level as of the thrust element. The control sleeve is arranged completely within a pump spring, which partly surrounds the pump element bushing. The pump dement bushing is formed integrally with a blind longitudinal bore which receives the pump piston. The pump spring extends from the level of the adjuster for adjusting the amount of fuel to be injected per injection, to the level of the working chamber of the pump piston.

Abstract: An internal combustion engine protection system utilizes lubrication oil pressure to directly protect an engine against failure of the lubrication oil system. The protection system comprises a yieldable base member assembly that replaces the conventional fixed surface of a governor housing for resisting the governor centrifugal weights and high speed spring. The yieldable base member assembly comprises a cylinder and piston arrangement. Lubrication oil is directed to a chamber in the cylinder behind the piston. As long as the lubrication oil pressure maintains the desired value, the piston remains fixed and functions as the conventional fixed surface. Should lubrication oil pressure fall for any reason, the governor high speed spring and centrifugal weights force the piston to move in the cylinder. The high speed spring and centrifugal weights also move to actuate fuel control racks to an engine shut down condition.

Abstract: A fuel injector assembly in an engine having a plurality of cylinders and intake passages opening respectively into the cylinders includes a housing mounted in each of the intake passages, and a plurality of solenoid-operated fuel injection valves connected to a fuel supply source for injecting fuel through the intake passage into each of the cylinders. The solenoid-operated fuel injection valves are accommodated in the housing. The housing has a magnetic shield layer such as an air gap disposed between the fuel injection valve means. The fuel injection valves are supplied with fuel from the fuel supply source through a common fuel supply passage defined in the housing.

Abstract: In a fuel/air mixture preparation device for internal combustion engines, there is a nozzle body (2) of rotational symmetry having a throttle member (7) of rotational symmetry which is displaceable within the body, the body forming a convergent/divergent nozzle. With the throttle member (7), which is displaceable in the nozzle body, the main air-mass throughput through the nozzle is determined. At least one fuel feed line (8 and 9) enters into the nozzle body. The fuel feed line has a circumferential fuel slot (10) which is developed in the wall of the nozzle body as well as a circumferential fuel/air slot (12) which joins it and is open towards the inside in the nozzle body. At a transition place between the fuel slot and the fuel/air slot there debouches an air feed (13) which is approximately under ambient air pressure. From a gap opening (11) of the fuel/air slot, the fuel mixed with air is injected approximately transversely to the direction of the main air mass flow, into the inside of the nozzle body.

Abstract: A device for the temporary storing and metered supplying of volatile fuel components present in the free space 22 of a fuel tank system 15 into the intake pipe 1 of a combustion engine 2. The device includes a deaeration pipe 25 which connects the free space 22 with the atmosphere 23 and in which a storage chamber 18 including an absorptive element is disposed. A pipe 20 connects the storage chamber 18 with the intake pipe and can be closed by means of an electromagnetic stop valve 13. An auxiliary valve 21 including a control chamber 14 which can be closed by means of a vacuum controller is disposed between the stop valve 13 and the intake pipe 1. A bypass 4 having an adjustable cross section is provided parallel to the auxiliary valve 21.

Abstract: A fuel vapor treatment apparatus for a vehicle for absorbing the fuel vapor emanating from a fuel tank has a diffusing chamber at the portion into which an inlet port opens. The fuel vapor introduced through the inlet port diffuses in this diffusing chamber, by which the component of the fuel vapor velocity in the direction in which the fuel vapor is adsorbed by the adsorbent is reduced. In consequence, the capability with which the canister adsorbs the fuel vapor is increased so as to allow a large volume of fuel vapor which flows at a high flow rate to be adsorbed.

Abstract: An electrically controlled fuel injection pump for internal combustion engines, in particular for direct fuel injection in engines having externally supplied ignition contains a plurality of pump pistons driven by a single common cam. The pumping quantity of fuel is delivered by pumping pistons is controlled via a rotary slide valve to the injection nozzles at the injection sites of the engine, wherein the quantity control is effected by an electrically controlled valve. An axial conduit of the rotary slide which discharges into control bores or control grooves distributed over the circumference of the rotary slide and cooperates with the pump work chamber and the pressure lines to the injection sites and is adjoined by at least one further control bore or control groove which communicates with a pressure reservoir. By this means, a preinjection, separate from a main injection, is made possible at the top dead center charge change.

Abstract: In a fuel injection device for internal combustion engines, having a pump plunger driven via a drive cam and a pressure chamber disconnected from a pump chamber by an intermediate plunger that upon its working stroke always assumes the end positions, a pressure line that leads from the pressure chamber to an injection nozzle. A control valve in a supply line for low-pressure fuel metering, the supply line is connected, under the control of the pump plunger with the pressure chamber via a filling line during a first intake stroke segment, for an injection quantity metering that is also angle controlled, and toward the end of the intake stroke of the pump plunger, the supply line is connected to the pump chamber for a time-controlled metering that determines the injection onset.

Abstract: A fuel delivery system for internal combustion engines in which an electric-motor fuel pump supplies fuel under pressure to a fuel injector carried by the engine. An engine air intake manifold is likewise carried by the engine and supplied with combustion air. A pressure sensor is responsive to a pressure differential between the fuel injector and air manifold for controlling a pulse-width modulated drive signal applied to the fuel pump motor.

Abstract: Hydrocarbon fuel vapors that are collected in a canister are periodically purged to the intake manifold through a purge valve that comprises a variable orifice valve portion and a flow regulator valve portion in series with each other. The variable orifice portion sets an orifice in inverse proportion to manifold vacuum. The flow regulator portion controls the flow in accordance with a signal from the engine E.C.U.

Abstract: A device for detecting a malfunction of a fuel evaporative purge system comprises a pressure sensor for detecting gas pressure in a purge passage connecting a canister to an intake pipe, and an intake vacuum sensor for detecting a negative pressure in the intake pipe. In the purging condition, the device determines whether the obtained relationship between the detected negative pressure in the purge passage and the detected intake vacuum is within a predetermined area and judges that a malfunction has occurred in the system when the relationship is not within the predetermined area.

Abstract: A canister with an electric fuel pump therein is connected to a cover for an access port through which the canister is installed on a fuel tank of an automobile by three hollow struts. Each strut has a first end press fitted into a socket on the cover and is telescopically received in a bore in the canister. Coil springs around each strut urge relative separation between the strut and the cover and a flare at a second end of each strut defines a stop to limit relative separation. A passage in the cover from a return fuel connection on an exposed side of the cover to one of the sockets conducts low pressure return fuel to the one of the hollow struts press fitted therein. The return fuel flows back to the canister through the one hollow strut.

Abstract: The fuel injection valve according to the invention enables an improvement in the fuel preparation and hence a more uniform fuel-air mixture while simultaneously supplying different inlet valves of an engine from one fuel injection valve. Downstream of the valve seat face of the fuel injection valve, the fuel enters a central opening from which tangential conduits lead to at least two swirl chambers disposedly spaced apart from one another and which discharge into these chambers at a tangent. From the center of each swirl chamber, which may be embodied in an attachment, a respective metering opening leads to the outside, by way of which fuel can be injected, well prepared, in the form of cone-shaped fuel streams. The fuel injection valve is suitable either for supplying individual inlet valves with a plurality of fuel streams, or for supplying different inlet valves of the engine with fuel at the same time.

Abstract: A fuel injector train having a variable injection rate includes a fuel injector having a plunger and a plunger biasing device having a predetermined spring rate for controlling the injection rate of the injector. A cam assembly is mounted to impart force through a push rod to a rocker arm which communicates the force of the cam assembly to the fuel injector plunger. In some embodiments, the push rod collapses axially a short distance in response to axial force applied thereto. The push rod has an inherent bias against collapsing that is less than the total bias of the injector biasing device so that during a portion of the injection cycle, part of the force imparted to the push rod collapses the push rod to operate the injector at a reduced rate. In another embodiment, the rocker arm is formed with a closable gap between its first and second ends, and the gap has an inherent bias against closing that is less than the total bias of the fuel injector biasing device.

Abstract: A metering valve, simultaneously controlling a plurality of flow paths with a single poppet movable into and out of engagement with a valve seat in a duty cycle operation has the sealing surfaces of the poppet and seat formed with an accurately flat surface finish to minimize leakage when the valve is closed. The seat surface is formed with recessed areas to reduce the area of contact with the poppet surface to reduce pull-off force while maintaining adequate contact area to dissipate the closing impact forces which are further minimized by controlling the flow of fluid from between the opposed surfaces during valve closure.

Abstract: The pump of the invention has application as a fuel pump for delivering fuel over a range of flow rates to an internal combustion engine. The pump may however be employed in many other applications, such as chemical applications, medical applications and hydraulic applications for example, particularyly where fine control of the fluid flow rate and a fast response from the pump to flow rate change requirements is necessary.

Abstract: A distribution fuel injection pump for delivering fuel to injection nozzles of an internal combustion engine, said distribution fuel injection pump comprising a pump working space communicating with the inlet connected with a fluid source and an outlet connected with the injection nozzles, at least one pump plunger defining at least partially said pump working space, a distributor piston having a distributor bore communicating the pump working space with the outlet and a relief bore communicating the a relief space, and a control valve for controlling fluid flow through the outlet, said control valve including a valve element for controlling fuel flow between distribution bore and the relief bore of the distributor piston.

Abstract: An electronically controlled fuel supply system for an internal combustion engine. The timing of the commencement of fuel injection into each combustion chamber is not fixed relative to the rotational position of the camshaft or other engine components. A unit injector assembly associated with each combustion chamber includes a control module and an accumulator type injector module. The control module contains a solenoid valve and, in some embodiments, a hydraulic pressure intensifier. The accumulator type injector module contains an injector nozzle, a hydraulic accumulator, and a non-return valve for admitting liquid fuel under pressure into the accumulator. In operation, an electrical control system supplies an electrical signal to the control module an appreciable portion of the engine cycle in advance of the time when fuel injection is to be initiated in the particular combustion chamber.