Abstract: An evaporative fuel control system for internal combustion engine which comprises a canister for storing a fuel vapor, a purge passage connecting the canister to an intake manifold, a valve provided in the purge passage, an engine temperature sensor for sensing an engine temperature, a fuel distillation sensor for sensing a fuel distillation characteristic of a fuel within a fuel tank, a first valve control part for controlling a valve opening position of the valve responsive to an engine temperature signal supplied from the engine temperature sensor, and a second valve control part for controlling a time to turn the valve on responsive to a fuel distillation signal supplied from the fuel distillation sensor.

Abstract: An improved pressure regulator for use with automotive engine fuel pumps wherein the ball is constrained for motion in a cage within the inlet chamber. The cage is made up of three simple cylindrical pins press fitted into an end cap. The inlet chamber is oversized with respect to the maximum dimensions of the caged ball array. In this manner, upon opening of the ball off of its seat, virtually no impediment to full flow of the maximum fuel pump capacity through the regulator is achieved.

Abstract: A fuel rail for a side- or bottom- fed injector wherein the rail contains conductors, and the injectors are connected to the conductors simultaneously with the insertion of the injectors into through-holes in the rail.

Abstract: A fuel injection system having a novel electromagnetic-actuated fuel pump in which four pumping elements, equally-spaced around a camshaft are mounted such that a pair of opposed pumping elements alternate to deliver pressure to a high pressure common rail with a second pair of pumping elements. In one embodiment of the invention the pumping elements are mechanically actuated, in another they are electronically actuated. The high pressure common rail is adapted to reduce surges in the fuel pressure from the pump up to levels of 20,000 psi. The common rail has a relief valve for controlling the maximum pressure in the common rail chamber. The electromagnetic injection nozzle has a needle valve that is closed by pressure in a balancing chamber having a reduced pressure level less than that of the pressure required to open the valve.

Abstract: A failure checking apparatus for use with an internal combustion engine associated with an evaporated fuel purging unit having a canister adapted to accumulate evaporated fuel from a fuel tank. Communication is provided between the canister and the engine to introduce the evaporated fuel from the canister to the engine. The communication is interrupted to permit the canister to accumulate evaporated fuel from the fuel tank when a parameter related to a rate of evaporated fuel produced in the fuel tank exceeds a predetermined value. The communication is introduced into the canister and resumed to permit evaporated fuel to be introduced from the canister to the engine a predetermined period of time after the communication is interrupted. An air/fuel ratio at which the engine is operating is sensed for detecting a first value representing the air/fuel ratio when the communication is held interrupted and a second value representing the air/fuel ratio after the communication is resumed.

Abstract: A fuel injection pump of the distribution type includes a load timer, and the load timer has a relief hole formed axially in a governor shaft, a first communication passage extending through a peripheral wall of the governor shaft surrounding the relief hole, and a second communication passage extending through a peripheral wall of a governor sleeve. One of the first and second communication passages has first and second control holes spaced axially from each other. The stroke of movement of the governor sleeve has a first movement region where the area of communication between the first control hole and the other communication passage decreases as the governor sleeve is retracted and a second movement region where the area of communication between the second control hole and the other communication passage increases as the governor sleeve is retracted.

Abstract: An evaporative emission of the fuel in a fuel tank is introduced to a cylinder of the engine through two evaporative fuel routes to burn the evaporative fuel. In this system, a control valve provided in one of the evaporative fuel routes is controlled based on a control state of a control valve provided in the other evaporative fuel route.

Abstract: An electrical control unit having a microprocessor and a network of counters for governing the electrical operation of a fuel control valve of a fuel injection pump. Four subtraction counters are preset by the processor; one is used as a time counter indexed by time pulses and three are used as pump angle counters indexed by pump clock pulses generated for each predetermined increment of pump rotation. Two of the pump angle counters are employed to precisely open and close the valve for regulating the fuel injection timing and quantity--the total quantity in a normal mode of operation and a pilot quantity in a pilot injection mode. In the pilot mode, the third pump angle counter regulates the main injection quantity and the time counter regulates the time delay between the pilot and main injections.

Abstract: A manually adjustable override apparatus is connected to an existing fuel pressure regulator to alter the fuel-to-air mixture fed to fuel injectors. A T-shaped member has a lower end adapted to be connected on the vacuum hose fitting of the regulator and has an outwardly extending hose fitting. A headed plunger slidably contained in the longitudinal bore of the T-shaped member has an elongate lower end extending outwardly from the bottom of the T-shaped member and through the hose fitting of the regulator to engage the top of the diaphragm in the regulator. Vacuum communicates around the plunger between the interior of the T-shaped member and the vacuum chamber of the regulator. An adjustment screw in the top end of the T-shaped member engages a small piston slidably and sealably contained in the longitudinal bore. A compression spring is biased between the piston and the head of the plunger. The vacuum hose is removed from the regulator and the override device is installed on the existing regulator.

Abstract: An arrangement for open-loop control or closed-loop control of a diesel internal combustion engine is described wherein the course of injection is electronically open-loop controllable and/or closed-loop controllable. For this purpose, a metering valve is multiply clocked for each metering cycle. In this way, the course of injection can be formed within wide limits in any desired manner. Furthermore, the unit chamber pressure can be controlled.

Abstract: A distributor type fuel pumping apparatus includes pumping plungers and auxiliary plungers both operated by cams as the distributor member is rotated. The pumping plungers are housed in a bore from which fuel is delivered to outlets in turn. In order to control the start and function of fuel delivery a shuttle is movable axially by the fluid delivered by the auxiliary plungers and is angularly adjustable. A sleeve is mounted about the shuttle and is movable axially in response to engine speed. The shuttle and sleeves define a spill path through which fuel can escape from the bore and which is closed after a first predetermined axial movement of the shuttle and they also define a flow path which is opened after a further predetermined axial movement of the shuttle. Fluid flow through the flow path operates a spill valve to allow spillage of fuel from the bore.

Abstract: A fuel injection system with precisioned cylinder to cylinder fuel control with computer controls for a normally closed solenoid fuel inlet control valve to a fuel distributor pump which features rapid response fuel cut off to terminate and precisely control and vary fuel pulse width to the separate cylinders of an internal combustion engine as computed to optimize engine operation for improved cylinder torque balance, idle speed control, cylinder cut out, and fuel control for improved particulate regeneration. In this system the solenoid valve is opened before the rotor inlet fuel ports hydraulically communicate to reduce solenoid pull in response and repeatably requirements while assuring fuel fill between the solenoid valve and rotor fill ports.

Abstract: The invention relates to a sloping-edge-controlled fuel injection pump for internal combustion engines, in particular as a direct injector for commercial vehicles. A cam-operated pump plunger, defining the pump working chamber and having an upper control edge effecting the start of delivery and a lower sloping control edge effecting the end of delivery, is guided axially and in a rotationally movable manner in the pump cylinder and has two peripheral grooves which, with two bypasses in the pump cylinder, interrupt the delivery, each bypass, in the projection perpendicular to the axis of the pump cylinder, partly overlapping feed bores arranged in the pump cylinder.

Abstract: An electronically controlled fuel injection system for an internal combustion engine comprises a fuel supply source, at least one fuel passage in the form of a nozzle disposed to be supplied with fuel from the fuel supply source, and a heater arranged in each of the at least one fuel passage for heating fuel in each fuel passage to generate a bubble therein so that pressure of the fuel therein is increased, whereby the fuel in each fuel passage is injected into the intake passage of the engine through an injection port of each fuel passage.

Abstract: The present invention relates to a fuel supplying device for an internal combustion engine having multiple cylinder. The present invention comprises a plurality of fuel injection valves, a fuel pipe through which fuel flows, and a plurality of holder means on the fuel pipe so that the fuel from the fuel pipe is supplied to the holder means. The holder means accommodates the fuel injection valve so that the fuel is supplied to the fuel injection valve, and a start timing of the fuel supplied from the fuel pipe to at least one of the holder means is different from the start timing of the fuel supplied from the fuel pipe to the remaining holder means.

Abstract: A unit fuel injector adapted to receive fuel from a fuel supply at relatively low pressure and adapted to inject fuel at relatively high pressure into the combustion chamber of an internal combustion engine is provided, comprising an injector body having a first internal bore and an injector orifice and a plunger mounted for reciprocating movement within the first internal bore to define a variable volume fuel pressurization chamber including a cam actuated upper plunger portion and a lower plunger portion mounted in the first internal bore between the variable volume fuel pressurization chamber and the upper plunger portion. While the upper plunger portion is in its retracted position, low pressure fuel from the fuel supply is supplied to the variable volume fuel pressurization chamber.

Abstract: Fuel rail assemblies for supplying fuel to injectors of internal combustion engines include mounting structure to integrally mount a fuel pressure regulator. An annular chamber, in fluid communication with the fuel passageway of the fuel rail, is defined between a mounting section of the fuel rail and a lower housing portion of the regulator. Apertures in the lower fuel rail housing portion thus allow fuel to flow into the regulating chamber of the fuel regulator from the defined annular chamber. In some preferred embodiments, the integral mounting structure includes a mounting cup having an upper cup section and a lower tail section for receiving a fuel pressure regulating and thus regulate upstream fuel pressure within the fuel rails. Fluid communication is established between the fuel rail and the cup section of the mounting cup while fluid isolation between the cup and tail sections of the mounting cup is established by suitable seal structures.

Abstract: A variable discharge high pressure pump for pumping a fuel into a common rail of a common rail type fuel injection system has a plunger reciprocable in a cylinder bore and a pumping chamber defined between and end face of the plunger and the inner peripheral surface of the cylinder bore. A solenoid valve has a valve member movable into an open position in which the valve member is moved out of engagement with an associated value seat into the pumping chamber when the solenoid valve is deenergized. When the solenoid valve is energized, the valve member is moved into a closed position in which the fuel pressure in the pumping chamber acts on the valve member to urge the same into engagement with the valve seat. The plunger is of a simple cylindrical structure free from any lead formed therein.

Abstract: An air fuel control system for an internal combustion engine is disclosed. The control system includes an air pressure responsive device for modulating mechanically the flow of fuel into the engine in response to the pressure of air within the intake manifold. The pressure-responsive device includes first and second chambers, separated by a diaphragm being attached to a piston, with the first chamber which is connected to the intake manifold by an air line. The air fuel control system further includes a fuel metering device for controlling the flow of fuel into the air-fuel control in response to intake manifold air pressure including a barrel and plunger assembly with the barrel inlet port being specifically configured to accommodate both the no-air and transition-curve fuel rail pressures. The barrel profile is designed to meter fuel quickly and precisely in response to changes in manifold air pressure.

Abstract: A two cycle engine with pneumatic injection, with the engine including a cylinder, a crankcase communicating with one end of the cylinder, and at least one transfer passageway joining the crankcase to the cylinder. A fuel injector is supplied with compressed air by a container connected to the crankcase and a flow restriction arrangement for restricting the flow of gases is disposed in the transfer passageway. The opening and closing of the flow restriction arrangement is controlled and regulated as a function of at least one engine operating parameter, with the overall result being an improvement in a quality of the fuel injection into the two cycle engines.