A fuel supply control system for a V-type two-cylinder general purpose engine according to the present disclosure, in a V-type two-cylinder general purpose engine including one fuel injection valve in a throttle body disposed upstream via an intake manifold connected to a cylinder head of each cylinder, changes an injection frequency or an operation timing of the fuel injection valve in accordance with an engine operation state detected by a detection unit.

A fuel supply device may include an intake manifold having both ends thereof respectively connected to intake openings of cylinder heads of each of the cylinders in a V-type two-cylinder general-purpose engine, a throttle body connected to a connection portion of the intake manifold, a fuel injection valve disposed in the throttle body and having nozzles for uniformly injecting fuel to inside of the intake port or to an inner wall surface of the intake port of each of the cylinders through the connection portion of the intake manifold, and a throttle valve disposed to the throttle body upstream of the fuel injection valve.

Embodiments for an internal combustion engine are provided. In one example, and internal combustion engine comprises at least two cylinders each including an injection nozzle and a fuel supply system for supplying the cylinders with fuel. The fuel supply system includes a supply line connecting each injection nozzle to a first fuel reservoir storing fuel at a first pressure, the first fuel reservoir filled by a pump provided upstream, a second fuel reservoir storing fuel at a second pressure less than the first pressure and connected to the first fuel reservoir via a connecting line for filling with fuel, and a bypass line connecting the second fuel reservoir to each injection nozzle. The bypass line opens into the fuel supply system downstream of the first fuel reservoir, thereby forming a connection point, and a shutoff element is arranged in the bypass line, opening or shutting off the bypass line.

An injection device for an internal combustion engine is proposed having at least one injection valve system for injecting fuel into an intake manifold of the internal combustion engine and at least one heating device for pre-heating fuel injected by the injection valve system, the injection valve system including a first injection valve for injecting fuel in the direction of a first inlet opening of a combustion chamber of the internal combustion engine and a separate, second injection valve for injecting fuel in the direction of a second inlet opening of the combustion chamber.

A control method for a vehicle injector includes an injection time determination step in which a controller determines whether it is necessary for multiple injectors to inject fuel according to a combustion cycle of a combustion chamber, an individual injection step in which the controller controls each of the multiple injectors to individually inject fuel at different times when the controller determines in the injection time determination step that it is necessary for the injectors to inject fuel, and a simultaneous injection step in which the controller controls each of the multiple injectors to simultaneously inject fuel after the multiple injectors individually inject fuel at different times in the individual injection step.

Even in the case where a crankshaft extends in a substantially vertical direction, it is possible to reduce a situation that sprays of fuel injected from injectors may adhere to inner wall surfaces of intake passages, and it is possible to make the fuel supply to combustion chambers stable. Provided is a vertical engine including: a pair of intake passages (911a and 911b) which are arranged in an up and down direction with the interposition of a central axis of a cylinder (241) therebetween; a pair of intake valves (41L.sub.1 and 41L.sub.2) which open and close the pair of intake passages; and fuel injectors (70L.sub.1 and 70L.sub.2) which inject fuel to the pair of intake passages; wherein: the fuel injectors are arranged so that fuel injection directions by the fuel injectors can go not toward valve stems (411) of the intake valves provided in the upper and lower intake passages respectively but toward the backs of valve heads of the intake valves on a central axis (C1) side of the cylinder and the fuel injectors are disposed so that a central axis (FC2) of injection of the fuel injector into the lower intake passage can be closer to the central axis side of the cylinder than a central axis (CF1) of injection of the fuel injector into the upper intake passage.

The present invention provides an intake system of an internal combustion engine. A plasma actuator is provided in a region which is on an inner wall surface of an intake passage and to which fuel injected from a fuel injection valve adheres. The plasma actuator is disposed so as to generate an airflow in a predetermined direction not including a component in a direction toward a downstream side of the intake passage at the time of its operation. A control unit is configured to control the plasma actuator so as to actuate the plasma actuator in at least a part of a period from start of fuel injection by the fuel injection valve to start of valve opening of an intake valve.

A nozzle plate is to be attached to a fuel injection port of a fuel injection device and injects fuel from the fuel injection port into an intake pipe through nozzle holes. The outlet side openings of the nozzle holes are partially blocked by interference bodies to determine the fuel injection directions and form orifices for reducing flows of the fuel at the outlet side openings. The plurality of orifices have different fuel injection directions, fuel fine particles in sprays draw ambient air, and the drawn air is provided with kinetic momentum to generate a spiral air flow. The nozzle plate is formed by cooling and solidifying molten resin having filled the cavity of a die.

The invention relates to a device for the injection of recirculated exhaust gases from a vehicle engine, in particular a diesel engine, the injection device comprising a plurality of injection ports (26.1, 26.2, 26.3, 26.4), provided in a portion of the material of the injection device, each injection port (26.1, 26.2, 26.3, 26.4) having a cross section and a height extending through the thickness of the material. According to the invention, the cross sections and/or the heights of at least two of the injection ports (26.1, 26.2, 26.3, 26.4) are different.

An engine system includes an engine housing including a plurality of intake valve openings, an intake port extending to the plurality of intake valve openings and an injector bore extending to the intake port. The engine system also includes a fuel system having a port fuel injector, and a fuel distributor having a baffle wall. The baffle wall extends into the intake port and extends at least partially around a fuel spray axis, forming a fuel channel and having at least one of a circumferentially varied porosity or an axially varied cross sectional area. The baffle wall shields fuel spray of an injected fuel such as methanol to limit a bias in distribution of fuel among the plurality of intake valve openings.