摘要:
A fuel injection type carburetor for multi-cylinder internal combustion engines includes: a throttle body having a throttle bore extending substantially vertically and being connected at the bottom portion thereof to a collecting portion of an intake manifold extending substantially horizontally; a throttle valve arranged in the throttle bore, a linear injection type fuel injection valve having a fuel injection nozzle arranged in the throttle bore in an area downstream area of the throttle valve and inclined toward the downstream direction; and an atomization promoting device arranged at a position opposite to the fuel injection nozzle so as to face the nozzle. The atomization promoting device is, for instance, a high frequency oscillator or a so-called PTC heater.
摘要:
A fuel injection type carburetor of multi-cylinder internal combustion engines including: a throttle body having a throttle bore extending substantially vertically and being connected at the bottom portion thereof to a collecting portion of intake manifolds extending substantially horizontally; a throttle valve arranged in the throttle bore, and; a linear injection type fuel injection valve having a fuel injection nozzle arranged in the throttle bore in a downstream area of the throttle valve and inclined toward the downstream side. The throttle bore has an extension extending downwardly into the intake manifold collecting portion so that a fuel jet injected from the fuel injection nozzle strikes against the extension of the throttle bore.
摘要:
Disclosed is a fuel injection type carburetor of a multicylinder internal combustion engine. The carburetor comprises: an intake manifold comprising a plurality of horizontal intake passages; a throttle body connected to a converging portion of said intake manifold; a throttle valve installed within said throttle body; and a fuel injector arranged downstream from said throttle valve in a manner such that injected fuel can impinge against at least a part of said throttle valve. An opening direction of a valve portion of said throttle valve against which portion injected fuel impinges is substantially the same as the direction of fuel injection from said fuel injector.
摘要:
A fuel injection valve, for an engine, comprising a nozzle body having a plurality of nozzle holes and a needle valve reciprocated in the nozzle body for controlling the inflow of the fuel into the nozzle holes is disclosed. The fuel is rendered to flow into the nozzle holes from a direction along the inner wall surface of the nozzle body around each of the nozzle holes in a first inflow mode, and from a direction substantially perpendicular to the inner wall surface of the nozzle body in a second inflow mode. The first inflow mode and the second inflow mode can be selectively switched to each other. The fuel is rendered to flow into the nozzle holes in the first inflow mode before the lapse of a predetermined time after the engine is started, and in the first or second mode as required after the lapse of the predetermined time.
摘要:
A fuel injection valve with improved fuel atomization which has a valve body, a needle valve accommodated in the valve body for opening and closing a fuel path at a sealing portion, and a metering member provided at a front end of the valve body and having a plurality of nozzle holes for metering a fuel and determining the fuel-injecting direction. The fuel injection valve comprises an inner wall of the valve body located downstream of the sealing portion which is shaped to be gradually contiguous to an upstream side surface of the metering member, and an intermediate surface of the needle valve for connecting the sealing portion and the most-downstream side bottom surface of the needle valve with each other forming the fuel path sloped inward in the downstream direction in association with the inner wall for introducing the fuel into the nozzle holes formed in the metering member when the needle valve is in an open state, wherein the intermediate surface of the needle valve being shaped in such a manner that a virtual intersecting line of a virtual linear extension of the intermediate surface and the upstream side surface of the metering member is positioned outside of a virtual circle circumscribing the upstream side openings of the nozzle holes formed in the metering member when the needle valve is in an open state.
摘要:
An engine, having an intake passage, a throttle valve arranged in the intake passage, and a fuel injector arranged in the intake passage for injecting fuel into the intake passage, comprises an air-flow control valve arranged in the intake passage between the fuel injector and the throttle valve. The air-flow control valve is controlled to close during the engine starting operation, and to open after the engine starting operation completes. The air-flow control valve has a valve element having an axis about which the element is rotatable when the valve is opened or closed. The rotational direction of the valve element is selected so that air flowing through the valve is guided by the valve toward the fuel injector when the air-flow control valve is controlled to an intermediate open position which is between the closed position and the full open position.
摘要:
A fuel injection valve 15 is disposed in an intake passage 9 of an engine body 1. A combustion chamber 5 communicates with the intake passage 9 for introducing fuel injected from the fuel injection valve 15 at predetermined intake timings. A plurality of sensors are provided in the engine body 1 or fuel intake system for detecting various engine operational conditions including properties of fuel. A control unit 30 calculates a fuel quantity-of-state in the combustion chamber 5 in accordance with the engine operational conditions detected by the sensors, using an atomized fuel behavioral model representing behavior of fuel injected from the fuel injection valve 15, an intake passage fuel behavioral model representing fuel behavior in the intake passage 9 and a combustion chamber fuel behavioral model representing fuel behavior in the combustion chamber 5. Furthermore, the control unit 30 calculates a fuel injection amount required to adjust an actual gaseous air-fuel ratio in the combustion chamber 5 to a desired value in accordance with the fuel quantity-of-state thus calculated. The control unit 30 uses a cranking model as the combustion chamber fuel behavioral model before an initial explosion is detected and uses a firing model after the initial explosion is detected. The fuel injection valve 15 is opened or closed on the basis of the fuel injection amount thus calculated.
摘要:
A fuel injection valve for an internal combustion engine includes an injector body and an adapter. The injector body includes a single fuel injection hole and the adapter includes a concave portion defining a dead volume portion and a pillar extending from a bottom surface of the concave portion toward the fuel injection hole formed in the injector body. Fuel injected through the fuel injection hole into the dead volume portion collides with a top surface of the pillar to form a cone-like fuel flow pattern and a large portion of the fuel can directly flow into injected fuel paths formed in the adapted without attaching to and collecting on surfaces of various portions of the adapter. Thus, stable fuel injection from the injected fuel paths can be obtained.
摘要:
An internal combustion engine comprising a vertically extending intake duct which is mounted on the collecting portion of the intake manifold. A throttle valve and a fuel injector are arranged in the intake duct. The fuel nozzle of the fuel injector is directed slightly downwards and located at a position spaced below the throttle shaft of throttle valve by a distance which is less than one half of the diameter of the intake passage formed in the intake duct.
摘要:
An internal combustion engine having an exhaust system provided with exhaust gas purifying means and secondary air supplying means disposed upstream thereof includes a secondary air injection compensating system comprising vacuum introducing means adapted to introduce and reserve the vacuum from an intake manifold vacuum port; secondary air switching means including two diaphragm means and a valve mechanism linked therewith; information processing means adapted to process the information from and O.sub.2 sensor and an acceleration detector to make a selection therefrom and issue a command; and vacuum switching means including two vacuum switching valves for selective conduction of said vacuum to said secondary air switching means by said command, and a compensating switching valve. The information processing means operate to communicate either of said two vacuum switching valves with the vacuum and the other with the atmosphere simultaneously and, under the secondary air injecting condition, cause said compensating switching valve to induce atmospheric air into the atmosphere communication system.