Abstract: A fuel injection apparatus for internal combustion engines in which beyond a predetermined remaining stroke during the supply stroke of the pump piston, a relief conduit is opened via a control edge. The same control edge closes the relief conduit once again during the intake stroke. During the subsequent effective intake stroke, the quantity of fuel to be injected upon the following compression stroke is metered by means of the electrically actuatable valve. The magnetic valve here is already opened before the closure of the relief conduit by the control edge, so that in the opening phase of the relief conduit, the pump work chamber of the fuel injection apparatus is flushed. In this manner, precise metering of the quantity of fuel to be injected is attained.

Abstract: A fuel injection pump for an internal combustion engine comprises a cam disc having a camming surface which, when the cam disc is rotatively driven, causes a plunger to be rotated and reciprocated to allow drawn fuel to be pressurized and distributed, to thereby deliver the pressurized fuel to the engine. The camming surface is configurated such that the plunger is moved substantially at a contant velocity in a fuel injection region for the engine idling, and after the termination of the fuel injection region the velocity of movement of the plunger is increased to a value higher than that in the fuel injection region for the engine idling. Delivery valves, through which fuel pressurized by the plunger is supplied to the engine, are each adapted to maintain a residual pressure within a corresponding injection pipe at a value that enables to attain injection initiating pressure within an extent of rotation of the cam disc corresponding to the fuel injection region for the engine idling.

Abstract: A fuel injection control system for an internal combustion engine utilizes a fuel injection pump in which the pump cylinder is in fluid communication with the fuel injection nozzle and a piezoelectric actuated spill valve. A cam drive actuates the pump piston to achieve a constant velocity during the pumping cycle (constant velocity relative to degrees of rotation of the engine crankshaft). An index wheel connected to either the engine crankshaft or the pump camshaft is used in conjunction with an initial position detector, angular position detector and a pump control unit to close and open the spill valve at predetermine positions of the pump piston during the pumping cycle. The pump control unit includes a computer connected to various engine parameter transducers to adjust the closing and opening of the spill valve to achieve a desired fuel injection volume.

Abstract: The fuel injection system for a diesel engine comprises a pintle type fuel injection nozzle having a valve needle slidable back and forth in the axial direction thereof between a first position in which its front end portion is inserted in a spray hole and a second position in which its front end portion is retracted from the spray hole, fuel supply means for feeding pressurized fuel to the fuel injection nozzle, and a plunger member which is slidable in the axial direction of the valve needle and provided with a front end face opposed to the rear end face of the valve needle and a rear end face adapted to receive the pressure of the pressurized fuel fed to the fuel injection nozzle from the fuel supply means, the valve needle being adapted to be lifted by a predetermined fuel pressure to a pre-lift position where the rear end face of the valve needle abuts against the front end face of the plunger member so that further lift of the valve needle is suppressed by the fuel pressure acting on the rear end face o

Abstract: A fuel injection nozzle of the present invention has an accumulating chamber in a body in which high pressure fuel fed from the fuel injection pump is stored using a non-return valve. A needle valve is arranged in the body to inject the fuel in the accumulating chamber. A nozzle needle of the needle valve and a valve member are arranged coaxially and in series with each other. Those end portions of the nozzle needle and valve member which are adjacent to each other are slidably and liquid-sealingly fitted together to define a damping chamber between the valve member and the nozzle needle. Further, a damping plunger is coaxially fitted into the valve member. A passage which connects the damping chamber with the side of the fuel injection pump is coaxially formed in the damping plunger and has a reduced area.

Abstract: A fuel injection valve for an internal combustion engine, in which a lift-limiting plunger is slidably fitted in a plunger chamber to receive fuel pressure for limiting the lifting amount of a nozzle needle. A back pressure chamber is defined by an end face of the plunger remote from the nozzle needle as part of the plunger chamber. A selector valve is controlled by an electronic control unit to establish communication between the back pressure chamber and a fuel intake passageway during low speed/low load operation of the engine, whereby the nozzle needle is lifted through a limited stroke to obtain a reduced fuel injection rate as well as a prolonged fuel injection period. A pressure inlet chamber permanently communicates with the back pressure chamber and is selectively communicated with the fuel intake passageway and disconnected therefrom by the selector valve, in synchronism with selective establishment and interruption of communication between the back pressure chamber and the fuel intake passageway.

Abstract: An injection rate controller for a fuel injection pump comprises first and second valve ports formed in a pump housing so as to communicate with each other through a connection aperture, a spool valve movably accommodated within the first valve port and adapted to form communication between the first valve port and a high pressure chamber through a communication aperture under a specific condition of engine drive, a pressure control valve having its cross section contracted gradually in its axial direction and accommodated within the second valve port so as to be reciprocative in synchronism with a plunger, and a spill channel formed in the pump housing for connecting the second valve port on a fuel exhaust side to a pump house, whereby part of high pressure fuel within the high pressure chamber is guided, under the specific condition of engine drive, successively to the communication aperture, first valve port, connection aperture and second valve port, and is caused to escape into the pump house through the

Abstract: A fuel injection pump for combustion engines with at least one pump piston which is actuated by a cam mounted on a mechanically operable camshaft is disclosed. The piston stroke is utilized only in part for delivery of the fuel, whereby the fuel feed volume is controllable by changing the effective piston stroke. The fuel injection pump also includes a control element which, in conformity with the number of revolutions of the combustion engine, varies the first derivative of the function of the effective piston stroke in accordance with the cam angle.

Abstract: The output of a transducer is passed to an electrical circuit for supply to a fuel control network. In order to check the output of the transducer the output of the electrical circuit is sampled in a sample circuit when the movement of the member associated with the transducer is a known value. The signal from the sample circuit is compared in a comparator with a reference signal. Any difference is passed to a gain determining circuit which calculates a new gain value for a variable gain amplifier in the electrical circuit. The value of the gain is retained in a holding circuit and supplied to the amplifier until further adjustment is required.

Abstract: A fuel injection pump for combustion engines with at least one pump piston which is actuated by a cam mounted on a mechanically operable camshaft is disclosed. The piston stroke is utilized only in part for delivery of the fuel, whereby the fuel feed volume is controllable by changing the effective piston stroke. The fuel injection pump also includes a control element which, in conformity with the number of revolutions of the combustion engine, varies the first derivative of the function of the effective piston stroke in accordance with the cam angle.

Abstract: A fuel injector, especially adapted for diesel engines, produces a fuel injection pulse having a predetermined time-variable flow rate. Preferably the injection pulse is ramp-shaped which approximates a linear function of time. A pressure chamber receives fuel at a substantially constant flow rate and an injection valve connected therewith opens in response to the pressure in the pressure chamber for delivering a fuel injection pulse to the combustion chamber. Means for absorbing a fluid pulse, in the form of an absorption chamber and flow restrictor, is connected with the pressure chamber to accept a ramp-shaped absorption pulse which is inversely related to the injection pulse.

Abstract: A single plunger distributor type fuel injection pump for multi-cylinder internal combustion engines having improved features for preventing cavitation in the fuel distribution passages upon fuel cutoff and for providing a uniform residual fuel pressure in the idle fuel distribution passages. The pump does not have the usual delivery valve for maintaining a high residual fuel pressure in the distribution passages. Instead, the passages upon injection termination drain into a spill chamber, the pressure within which builds up to resist fuel flow from the passages and minimize cavitation therewithin. The spill chamber pressure is relieved by a bleed passage opening into the low pressure fuel supply chamber. The pressure in the idle fuel distribution passages is maintained at a low predetermined level by connection of the passages to the fuel supply chamber between injection intervals.

Abstract: A distributor type fuel injection pump which includes a relief passage having one end thereof opening in the pump working chamber and the other end communicating with a zone under a lower pressure. Said relief passage is so arranged as to be permanently kept closed by a valve means which is actuated by a valve actuating means for actuating said valve means in response to a fuel supply pressure varying as a function of the engine rotational speed, except in a predetermined low engine speed range, to obtain a decreased injection rate during idling so as to increase the injection period. Thus, the rate of combustion of the engine is reduced to minimize the combustion noise.