Abstract: A compact multiple throttle device where multiple throttle shafts are driven by a single drive force. A throttle device includes a first throttle shaft to which a first throttle body and a third throttle body are fixed and also includes a second throttle shaft to which a second throttle body and a fourth throttle body are fixed. The first throttle shaft and the second throttle shaft are parallel to each other. The third throttle body and the fourth throttle body are integrally coupled to each other in a gear case. In the inside of the gear case, a motor for driving the first throttle shaft and the second throttle shaft is arranged. Further, first to sixth gears for transmitting drive force of the motor to the first throttle shaft and the second throttle shaft are included.

Abstract: In a general-purpose internal combustion engine having a throttle valve and a choke valve each installed in an air intake passage connected to a combustion chamber, air sucked in flowing through the air intake passage and mixing with fuel supplied by a carburetor to generate an air-fuel mixture that enters the combustion chamber of a cylinder and is ignited to drive a piston to rotate a crankshaft to be connected to a load such as a generator, there are provided an electric motor (actuator), a throttle valve opening/closing mechanism connected to the motor to open/close the throttle valve and a choke valve opening/closing mechanism connected to the throttle valve opening/closing mechanism to open/close the choke valve in response to operation of the throttle valve opening/closing mechanism, thereby enabling to move a choke valve without need to install an additional actuator.

Abstract: A valve control apparatus of a diesel engine (1) is provided with an EGR valve (30), which is provided in an EGR passage (26) of the engine (1) and varies the flow rate of exhaust gas flowing through a passage (26) by carrying out an opening and closing motion, and an actuator (28), which executes a sticking avoiding operation for dissolving or preventing a sticking of a valve (30) by causing the valve (30) to move to and fro so as to open and close the valve (30) by a predetermined moving amount respectively in one direction and the other direction near a full-close position of the valve (30). The apparatus inhibits the sticking avoiding operation by the actuator (28) when an ignition OFF operation is carried out without starting an operation of the engine (1) after an ignition ON operation is carried out. As a result, it is possible to prevent a useless valve opening and closing motion and achieve power saving.

Abstract: An integrated valve device includes a casing having cylindrical portions each defining therein a fluid passage. The fluid passage accommodates a valve being adapted to opening and closing the fluid passage. A shaft extends through the valves to manipulate positions of the valves all together. Each cylindrical portion has a pair of wall portions each opposed to corresponding one sidewall surface of each of the valves. The pair of wall portions is located in a range out of an open-close range between a full close position and a full open position of the valve. Each wall portion has a protrusion for supporting the valve by being in direct contact with corresponding one of the sidewall surfaces when the protrusions of the pair of wall portions interpose therebetween the valve.

Abstract: A valve assembly is disclosed that includes a first and a second valve assembly parts that collectively define a duct. The valve assembly also includes a valve unit that includes a housing defining a fluid flow path therethrough. The valve unit is coupled to the first valve assembly part such that the fluid flow path is in fluid communication with the duct. A control valve is also included for controlling flow of fluid in the flow path. Furthermore, the valve assembly includes a sealing member that seals a space between the first valve assembly part and the second valve assembly part, that seals a space between the first valve assembly part and the valve unit, and that dampens vibration transmitted to the valve unit.

Abstract: A cross-sectional shape of a first intake passage is formed in a circular shape and a cross-sectional shape of a second intake passage is formed in a rectangular shape. Thus, an opening area of a second intake throttle portion can be made larger than an opening area of a first intake throttle portion even when the opening area of the first intake throttle portion is narrow and an intake air quantity supplied into a combustion chamber of an engine is small as in the case of engine start-up or engine idling operation. Accordingly, an intended strong tumble flow in accordance with a demand for improving a combustion efficiency in the combustion chamber can be generated in the combustion chamber while achieving the intake air quantity necessary during the engine start-up or the engine idling operation.

Abstract: An engine wherein a progressive throttle body includes two side by side throttle bores with throttle blades of equal size. A primary throttle opens from closed to an idle position with slowly increasing flow providing excellent idle and low engine speed air control. A secondary throttle opens slightly after the idle airflow position of the primary throttle and then opens more quickly, equaling the primary throttle opening near half throttle. Thereafter, the throttles open together, raising the airflow to maximum when both throttles are fully open. Both throttles are driven by a single electronically controlled motor or other actuator through two gearboxes that provide the varying flow curves. Throttle position sensors on both throttle shafts feed back throttle positions to an electronic controller to provide needed data for electronic throttle control in response to throttle commands. Additional features are disclosed.

Abstract: A fuel injection unit is designed for replacement of existing carburetors. The fuel injection unit can be sized similarly to the existing carburetor. The fuel injection unit can have concealed fuel injectors. End caps can be provided that overlie the fuel injectors and that contain fuel line connections. The end caps provide an appearance of carburetor fuel bowls while generally concealing the fuel injectors and the associated fluid connections.

Abstract: A compact multiple throttle device where multiple throttle shafts are driven by a single drive force. A throttle device includes a first throttle shaft to which a first throttle body and a third throttle body are fixed and also includes a second throttle shaft to which a second throttle body and a fourth throttle body are fixed. The first throttle shaft and the second throttle shaft are parallel to each other. The third throttle body and the fourth throttle body are integrally coupled to each other in a gear case. In the inside of the gear case, a motor for driving the first throttle shaft and the second throttle shaft is arranged. Further, first to sixth gears for transmitting drive force of the motor to the first throttle shaft and the second throttle shaft are included.

Abstract: The invention relates to a method which uses an injection mould for the production of an intake system which is composed of plastic and is intended for internal combustion engines, and which has a plurality of parallel-running intake pipes and which has, arranged in the intake pipes, throttle flaps operated by way of a shared shaft bearing against bearings located in the walls of the intake pipe. A simplified production process is obtained if two mandrels (1, 2) of the injection mould, intended for formation of apertures for the bearings, are inserted respectively from one side of the injection mould in such a way that ends of the mandrels (1, 2) bear against one another in the injection mould, and if the method of production of apertures situated further outwards, with respectively greater diameter than the adjacent inwardly situated apertures is such that each mandrel (1, 2) is of staged shape, and the mandrels (1, 2) are drawn out during demoulding at the two sides of the injection mould.

Abstract: A throttle management apparatus for an internal combustion engine is provided which allows the response of the engine to an operator's request to be improved while allowing the output characteristic of the engine to be controlled arbitrarily. The throttle management apparatus controls plural throttle valves provided for plural cylinders respectively. The throttle management apparatus includes an electric throttle management apparatus which electrically drives the throttle valves for some of the cylinders based on an electric signal generated according to selected operating conditions of the vehicle, and a mechanical throttle management apparatus which, through throttle activation member operation, mechanically drives the throttle valves for the rest of the cylinders.

Abstract: An intake control device of an internal combustion engine in which an intake path of each cylinder is partitioned into an upper and a lower path and a tumble control valve and an intake pressure control valve are provided to open/close the upper path and lower path respectively. In a given driving condition, the intake air flow velocity in the lower path is increased by closing the tumble control valve, thereby generating a tumble flow in the combustion chamber. In this process, the intake pressure control valve is opened around start of an intake stroke and closed around its end to make intake pressure downstream of the intake pressure control valve higher than upstream of it to increase the difference between upstream and downstream intake pressures in the intake stroke. This increases the intake air flow velocity in the lower path and intensifies the tumble flow in the combustion chamber.

Abstract: An engine wherein a progressive throttle body includes two side by side throttle bores with throttle blades of equal size. A primary throttle opens from closed to an idle position with slowly increasing flow providing excellent idle and low engine speed air control. A secondary throttle opens slightly after the idle airflow position of the primary throttle and then opens more quickly, equaling the primary throttle opening near half throttle. Thereafter, the throttles open together, raising the airflow to maximum when both throttles are fully open. Both throttles are driven by a single electronically controlled motor or other actuator through two gearboxes that provide the varying flow curves. Throttle position sensors on both throttle shafts feed back throttle positions to an electronic controller to provide needed data for electronic throttle control in response to throttle commands. Additional features are disclosed.

Abstract: A first arbitration unit determines one demand engine torque of static demand engine torques set in a power train driver model and an ECT torque control system. The demand engine torque determined by the first arbitration unit is converted into dynamic demand engine torque by a conversion unit. A second arbitration unit determines demand engine torque for use in control of an engine from among the dynamic demand engine torque converted from the static demand engine torque by the conversion unit, dynamic demand engine torque set by a VDIM system, and dynamic demand engine torque set by a vibration suppression control system. An engine control system controls the engine according to the demand engine torque determined by the second arbitration unit.

Abstract: A throttle assembly including a first throttle component that is formed of a plastic material including a conductive additive substantially homogeneously dispersed within the plastic material, and a second throttle component is axially aligned with the first throttle component and movable relative to the first throttle component between a first position and a second position to selectively vary a flow through the throttle assembly. A terminal is coupled to the first throttle component such that electricity may be provided to the first throttle component, thereby resistively heating the first throttle component via the conductive additive and a flow window is defined in one of the first throttle component and the second throttle component.

Abstract: A throttle valve control system for an internal combustion engine includes plural throttle bodies with respective intake passages formed therethrough. Each of the respective throttle bodies includes a throttle valve shaft and a throttle valve, the throttle valves are operated by an actuator via the throttle valve shafts. The throttle bodies are each provided with plural fuel injection valves, and fuel lines which connect adjacent fuel injection valves together are arrayed in parallel with a direction of the throttle valve shafts, and are arranged between the throttle bodies and the actuator.

Abstract: A throttle body includes first and second intake conduits, first and second valves, and first and second gears. The first and second intake conduits are configured for respective placement in fluid communication with first and second cylinder housings of an engine. The first valve is associated with the first intake conduit and is movable to selectively adjust restriction of the first intake conduit to passage of fluid. The second valve is associated with the second intake conduit and is movable to selectively adjust restriction of the second intake conduit to passage of fluid. The first gear is attached to the first valve and the second gear attached to the second valve. The second gear is engaged with the first gear such that the first and second gears correspondingly rotate. Engines and saddle-type vehicles are also provided.

Abstract: A system for controlling turbulence in a combustion engine having a composite upper intake manifold and a cylinder head. The system includes a composite housing, a composite cartridge, a shaft, a radial gasket, a lever arm, and a press in place gasket. The composite housing includes an open first end and an open second end. The open second end defines a first cross-sectional area. The first end is configured to be welded to the composite upper intake manifold and the second end has a gasket groove. The second end is configured to be connected with the cylinder head. The composite cartridge is positioned within and removably joined with the second end of the composite housing. The composite cartridge includes a body, a flap valve, and bushings. The shaft connected to the flap valve within the composite housing. The press in place gasket is positioned within the gasket groove.

Abstract: To stably maintain an opening degree characteristic of a driven lever, the driven lever (5) is attached to one end (3A) of a main throttle shaft (3) to which a main throttle valve (4) is attached, a cam lever (10) is attached to one end (8A) of a sub throttle shaft (8) to which a sub throttle valve (9) is attached, a cam surface (10A) of the cam lever (10) faces to a roller (5A) of the driven lever (5), a cup-shaped throttle cover (12) is arranged on one side wall (1A) of a throttle body (1), an opening portion (12C) of a throttle cover (12) is closed by a closing cover (20), and a lever storage chamber (22) formed by the throttle cover (12) and the closing cover (20) accommodates the cam lever (10) and the driven lever (5).

Abstract: A throttle assembly for intake air protects a link mechanism for interlocking throttles with each other from water and mud and maintains the throttle operability in a satisfactory state. The throttle assembly for intake air includes a plurality of throttle devices for injecting fuel into intake air to generate an air-fuel mixture; a link mechanism for connecting driving portions of the throttle devices with each other, a link mechanism housing chamber defined by an outer wall member for forming a link mechanism housing chamber and housing the link mechanism, and seal members provided at the connected or mated portions of the outer wall member and a different member or the connected or mated portions of a plurality of outer wall configuring members which configure the outer wall member.

Abstract: An intake system of an internal combustion engine includes an engine head, a resin made intake manifold mounted at the engine head and having intake passages, the resin made intake manifold forming a receiving portion on an inner wall of each intake passage at a downstream side, and a control unit disposed at the receiving portion and including a resin made cartridge, an opening and closing valve disposed at the cartridge, and a shaft rotating the valve, wherein a clearance is provided between an inner circumferential surface of the receiving portion and an outer circumferential surface of the cartridge to allow deformation of the resin made intake manifold, and the cartridge is provided with a flange held between the engine head and the resin made intake manifold.

Abstract: An intake control device for a vehicle engine includes: a throttle body; a main throttle valve configured to be opened or closed in response to an operation applied to a throttle grip, the main throttle valve being rotatably supported by the throttle body; a sub-throttle valve configured to be opened or closed under control of an actuator, the sub-throttle valve being rotatably supported by the throttle body; an intake air path formed in the throttle body and provided with the main throttle valve and the sub-throttle valve so as to open or close the intake air path; and a bypass air path that is different from the intake air path and provided with an idle speed control (ISC) valve that is controlled so as to open or close the bypass air path in conjunction with the sub-throttle valve.

Abstract: A variable geometry intake manifold for an internal combustion engine; the intake manifold presents: at least one intake pipe which connects the intake manifold to at least one cylinder of the internal combustion engine; and a choking system to vary the geometry of the intake manifold and comprising at least one choke valve provided with a choke body, which is arranged within the intake pipe and is turnably mounted about an axis of rotation; the choke valve integrates therein a pair of mechanical stoppers, which respectively determine the location of an active position and of a home position of the choke body.

Abstract: A throttle body for an internal combustion engine of an automobile includes a housing defining a plurality of spaced apart, separated intake passages, a plurality of throttle valves, a plurality of throttle shafts and a drive mechanism. The plurality of throttle valves is rotatably disposed in the plurality of intake passages. Each throttle shaft is adapted to support one of the plurality of throttle valves. A drive mechanism is operably connected to the plurality of throttle shafts to rotate the plurality of throttle valves. The drive mechanism includes a single motor and a gear arrangement. The gear arrangement is configured to drive at least two throttle shafts of the plurality of throttle shafts at varying speeds. The gear arrangement selectively and sequentially opens at least two throttle valves of the plurality of throttle valves at varying rates.

Abstract: An intake air control system of a V-type internal combustion engine is arranged in a V-shaped space defined between front and rear banks of the engine. The intake air control system includes front and rear throttle bodies having front and rear throttle valves thereon, and a plurality of electrically-operated actuators which drive the throttle valves. The electrically-operated actuators are arranged between the front and rear banks. The arrangement of the electrically-operated actuators prevents overheating thereof, and provides a storing space for disposing auxiliary equipment in a lower portion of the V-shaped space. The front bank includes an opening formed therein which directs wind towards the electrically-operated actuators disposed in the V-shaped space during operation of the vehicle.

Abstract: A motorcycle includes a throttle, a main throttle valve controlled to be opened or closed by an operation of the throttle and a sub throttle valve controlled to be opened or closed in response to an opening degree of the main throttle valve. A memory a plurality of sub-throttle valve opening degree maps, each of which has unique sub throttle valve opening degree characteristics, fuel injection amount maps each of which has unique fuel injection amount characteristics and corresponds to each of the sub throttle valve opening degree maps respectively, and ignition timing maps, each of which has unique ignition timing characteristics and corresponds to each of the sub throttle valve opening degree maps respectively. A drive mode selecting switch is operable to select an intended drive mode from a plurality of drive modes so as to select a sub throttle valve opening degree map from the stored sub throttle valve opening degree maps.

Abstract: An engine unit that has a throttle valve driving actuator securely fixed thereto, and in which the vibration caused on the actuator is small. The engine unit includes a V-type engine and a throttle body assembly. The throttle body assembly has first and second front and rear throttle bodies, an actuator, a transmission gear mechanism, and a casing that houses the actuator and the transmission gear mechanism. The casing has a first casing portion that is fixed to the first front and rear throttle bodies, and a second casing portion that faces the first casing portion in a width direction and is fixed to at least one of the second front and rear throttle bodies.

Abstract: The present invention relates to a system (1) for supplying an air-fuel mixture to a two-stroke internal combustion engine (2), comprising a carburettor (3) having a throttle valve (4) and a choke valve (5). The system further has a transfer passage (6) between a crankcase (7) chamber and a combustion chamber (8) of said engine (2). A supply conduit for additional air (9) is having an air valve (10) for said additional air, and said supply conduit for additional air (9) is being adapted to discharge the additional air into the top portion of said transfer passage (6) during a portion of a cycle of said two-stroke internal combustion engine (2). Further the air valve (10) is controlled by the throttle valve (4) so as to affecting a air valve opening state when said throttle valve opening state is affected, and the opening state of said air valve (10) is delimited by a choked state of said choke valve (5) regardless of the throttle valve opening state.

Abstract: A multiple carburetor two-stroke, two cylinder intake manifold that includes at least two cylinder bores evenly spaced apart on a flat, rectangular plate body. Formed in the plate body is a longitudinally aligned closed air passageway that extends between the two adjacent cylinders that allows the cylinders to draw air and gasoline mixture from any carburetor. In the first embodiment, the manifold includes an upper plate and a lower plate. The lower plate includes two oblong cylinder bores and a longitudinal aligned recessed cavity that acts as the air passageway when the upper plate is attached over the lower plate. In a second embodiment, the lower plate includes two circular cylinder bores and two adjacent slots formed at the opposite ends of a recessed cavity. A small cap is placed over the recessed cavity to form the air passageway. As disclosed herein is a method for improving the performance of a two stroke, two cylinder engine using one of the above referenced manifolds.

Abstract: An air intake control apparatus includes a body forming an intake passage for an internal combustion engine, a bore member retained within the body to be movable relative to the body and having a bore being in communication with the body and having an internal peripheral surface forming a portion of the intake passage, at least one shaft body penetrating through the bore member and rotatably provided at the body, at least one valve body fixed to the shaft body so as to adjust an opening degree of the intake passage in the bore member, and a reference portion defining a relative position of the bore member to the shaft body in an axial direction of the shaft body.

Abstract: An intake control device for a vehicle engine includes: a throttle body; a main throttle valve configured to be opened or closed in response to an operation applied to a throttle grip, the main throttle valve being rotatably supported by the throttle body; a sub-throttle valve configured to be opened or closed under control of an actuator, the sub-throttle valve being rotatably supported by the throttle body; an intake air path formed in the throttle body and provided with the main throttle valve and the sub-throttle valve so as to open or close the intake air path; and a bypass air path that is different from the intake air path and provided with an idle speed control (ISC) valve that is controlled so as to open or close the bypass air path in conjunction with the sub-throttle valve.

Abstract: An intake air control valve has a bore defining member and a butterfly-type valve member that includes a shaft and a valve body. The valve body has a pair of valve portions joined to the shaft and rotatable between a fully closed position and a fully opened position; Each of the valve portions has a central portion and opposite end portions along a direction of the rotational axis of the valve member. The thickness of each of the valve portions gradually increases from the central portion toward the end portions.

Abstract: A method for controlling a dethrottled internal combustion engine, which has a shared fresh gas line which supplies fresh gas to fresh gas pipes, which in turn supply fresh gas to each cylinder. The engine has at least one intake valve per cylinder, a clocked valve per fresh gas pipe for opening and closing the gas pipe and a fuel injector for each cylinder, for metered addition of fuel. The chronological location of the injection time of the fuel is adjusted for the respective cylinder as a function of a point in time of a change in the switch position of the respective clocked valve, to improve the emission values of the engine. In addition, the clocked valves are controlled so that the metered addition of fresh gas is accomplished for the respective cylinder.

Abstract: A transmissible connecting mechanism having a cam plate and a lever are attached respectively to a lead air control valve shaft and an air-fuel mixture throttle valve shaft which are arranged so as to form an angle. A length of a contact element provided in the lever is extended in parallel to an axis of the air-fuel mixture throttle valve shaft, and the length of the contact element is such that the contact element and a cam surface formed in a cam plate are always brought into contact with each other. The lead air control valve shaft and the air-fuel mixture throttle valve shaft of the carburetor are connected in a transmissible manner, and it is possible to make a stratified scavenging two-cycle engine compact.

Abstract: An intake control valve of an intake device of an internal combustion engine comprises a given portion defined by an air intake passage that leads to a combustion chamber of the engine through an intake valve; a pivot shaft passing through the given portion; and a valve plate secured to the pivot shaft to pivot therewith within the given portion. The valve plate is pivotal between a close position to close the air intake passage and an open position to open the air intake passage. When the valve plate assumes the close position, the interior of the air intake passage downstream the valve plate is formed with mutually isolated first and second air flows that are separated and oriented to enhance a flow of air/fuel mixture in the combustion chamber.

Abstract: The present invention utilizes a single shaft with cam-actuated control valves and one linear solenoid for control of air flow control vales in the air induction system for a V-type engine. According to various exemplary embodiments of the present invention, the single shaft and one sensor are utilized to activate all control valves. Additionally, the present invention can also be used in in-line engines. Advantageously, the present invention utilizes one moving shaft and sensor to activate all control valves on both sides of the intake manifold without restricting air flow by locating the shaft in the middle of the manifold—lower housing. Further, the control valves are not attached with screws, thus eliminating a tolerance stack-up at assembly problem. The air induction sub-system can be manufactured with metals or plastic, or any combination thereof.

Abstract: A retainer device is provided suitable for supporting a valve shaft in a variable intake system. Preferred retainer devices can stably support a valve shaft of a variable intake system and may suitably include a shaft support part that can engage a valve shaft of the variable intake system; a fork part that can engage a valve shaft locking bolt; and a stop part spaced from the fork part by a distance sufficient to position the locking bolt between the fork part and the stop part. In preferred systems, even if a valve shaft locking bolt fastening the valve shaft is undesirably loosened during engine operation, the locking bolt is prevented from being completely removed from the retainer, thereby avoiding potential engine damage.

Abstract: An intake air control device is provided in which a valve shaft extends in the left and right direction of a vehicle body frame across an air intake path, and is rotatably supported by an air intake path forming body connected to an engine body, equalizing the distances from a center of the vehicle body frame in the left and right direction to both ends of the intake air control device when arranging the air intake path forming body at the center of the vehicle body frame in the left and right direction. An actuator, which applies a motive power to drive the valve shaft, is connected to one end of the valve shaft, and a throttle operating amount sensor for detecting the throttle operating amount by a vehicle operator is supported by the air intake path forming body and connected to the other end of the valve shaft.

Abstract: A throttle body for an internal combustion engine of an automobile includes a housing defining a plurality of spaced apart, separated intake passages, a plurality of throttle valves, a plurality of throttle shafts and a drive mechanism. The plurality of throttle valves is rotatably disposed in the plurality of intake passages. Each throttle shaft is adapted to support one of the plurality of throttle valves. A drive mechanism is operably connected to the plurality of throttle shafts to rotate the plurality of throttle valves. The drive mechanism includes a single motor and a gear arrangement. The gear arrangement is configured to drive at least two throttle shafts of the plurality of throttle shafts at varying speeds. The gear arrangement selectively and sequentially opens at least two throttle valves of the plurality of throttle valves at varying rates.

Abstract: A throttle assembly for intake air protects a link mechanism for interlocking throttles with each other from water and mud and maintains the throttle operability in a satisfactory state. The throttle assembly for intake air includes a plurality of throttle devices for injecting fuel into intake air to generate an air-fuel mixture; a power transmission mechanism for interlocking the driving portions of the throttle devices with each other, a power transmission mechanism housing chamber defined by an outer wall member for forming a power transmission mechanism housing chamber and housing the power transmission mechanism, and seal means provided to the connected or mated portions of the outer wall member and a different member or the connected or mated portions of a plurality of outer wall configuring members which configure the outer wall member.

Abstract: A fresh gas system for a piston engine has a collecting line for supplying fresh air to multiple individual lines. The fresh gas system has the collecting line which is unthrottled and a control unit for actuation of the additional valves is designed so that it subdivides a fresh gas charge of the combustion chamber which depends on the load state into two charging phases (A, B) within an intake time window (T). This is limited by the opening and closing of the intake valve such that it actuates the additional valve to close within the intake time window (T) at a closing point in (TS). This depends on the load state and then actuates it to open at a later opening point in time (TO) that depends on the load state of the piston engine.

Abstract: To make compact a motor actuator and a tandem valve type throttle body preferably for two-wheeled vehicles, a gear portion (G) and a motor (M) are arranged in an actuator case constituted by a gear case (2) and a motor case (1), the gear portion (G) is formed by a motor gear (G1), an intermediate gear (G2) consisting of a small-diameter gear (G22) and a large-diameter gear (G21) in parallel, and an output gear (G3), the motor (M) protrudes into the gear case (2) and is near the large-diameter gear (G21), an actuator support boss (6a) of a throttle body (6) is inserted into a throttle body insertion hole (id) a protruding end portion (9a) of an auxiliary throttle valve shaft (9) is inserted into a connection hole (G3a), and a mounting boss (5) is screwed to the throttle body (6) via a mounting hole (4).

Abstract: A throttle management apparatus for an internal combustion engine is provided which allows the response of the engine to an operator's request to be improved while allowing the output characteristic of the engine to be controlled arbitrarily. The throttle management apparatus controls plural throttle valves provided for plural cylinders respectively. The throttle management apparatus includes an electric throttle management apparatus which electrically drives the throttle valves for some of the cylinders based on an electric signal generated according to selected operating conditions of the vehicle, and a mechanical throttle management apparatus which, through throttle activation member operation, mechanically drives the throttle valves for the rest of the cylinders.

Abstract: An intake system for a motorcycle having an engine. The intake system includes an air box having a first opening for receiving intake air and a second opening for supplying the intake air from the air box to a throttle assembly of the engine. A filter element is disposed within the air box for separating debris from the intake air. A valve is disposed within the air box between the filter element and the second opening. The valve is movable to provide a variable restriction to intake air flow through the air box.

Abstract: In order to protect a rotating portion of an intermediate link lever support pin, an intake air control apparatus provided with main and sub throttle valves is structured such that a wire bracket (6) supporting valve opening and closing wires (Wa, Wb) is screwed to an outer end surface (1a) at a throttle drum side of a throttle body (1), an intermediate link lever support pin (23) is provided toward the throttle body (1) side on an inner end surface (6d) facing to the throttle body (1) of the wire bracket (6), an intermediate link lever (20) rotatably borne to the intermediate link lever support pin (23) is arranged at the throttle body (1) side from the inner end surface (6d), and a rotating portion (R) of the intermediate link lever support pin (23) and the intermediate link lever (20) is arranged to face to the inner end surface (6d).

Abstract: A multicylinder engine intake system includes: first and second throttle bodies; bypasses provided in the first and second throttle bodies and having downstream ends opened to intake paths on downstream sides of throttle valves; and a common bypass control valve which opens and closes the bypasses. The bypass control valve is mounted on the first throttle body. Downstream ends of the bypasses opened in the first and second throttle bodies are formed as throttle holes. The diameter of the throttle hole on the side of the first throttle body is smaller than the diameter of the throttle hole on the second throttle body. Thus, it is possible to equalize amounts of first idling air supplied to a plurality of cylinders irrespective of arrangement of the cylinders in an engine even if lengths of a plurality of bypass downstream paths are not equal to each other, while the bypass control valve is mounted on any of the throttle bodies.

Abstract: A motorcycle includes a throttle, a main throttle valve controlled to be opened or closed by an operation of the throttle and a sub throttle valve controlled to be opened or closed in response to an opening degree of the main throttle valve. A memory a plurality of sub-throttle valve opening degree maps, each of which has unique sub throttle valve opening degree characteristics, fuel injection amount maps each of which has unique fuel injection amount characteristics and corresponds to each of the sub throttle valve opening degree maps respectively, and ignition timing maps, each of which has unique ignition timing characteristics and corresponds to each of the sub throttle valve opening degree maps respectively. A drive mode selecting switch is operable to select an intended drive mode from a plurality of drive modes so as to select a sub throttle valve opening degree map from the stored sub throttle valve opening degree maps.

Abstract: A valve regulating device intended to regulate the circulation of a fluid in the region of an opening, said device consisting of a pivoting valve body, of an annular support body integrating two opposing bearings mounting said valve body in a rotational manner, and of a control pin, wherein said valve body may be displaced in rotation between a totally open position and a closed position, in which it rests against the annular seat provided by the support body; the support body is provided with a seal with a first extending functional segment and a second extending functional segment having protruding lateral extensions, for example in the form of ribs, on the face of the support body that bears against the edge of the opening, said extensions also being interconnected by intermediate joining portions, which also extend in a protruding manner over the bodies of the two opposing bearings so as to provide a continuous peripheral seal around the opening when the regulating device is mounted on said opening.

Abstract: For accurately estimating an air quantity flowing into a cylinder at the time of operating an intake control valve, a control apparatus for an engine according to the present invention is provided with an intake control valve which can open/close an intake passage in synchronization with opening/closing of an intake valve, intake control valve controlling means which opens the intake control valve in the midst of the intake stroke and thereafter, closes the intake control valve, and air quantity estimating means which estimates an air quantity flowing into a cylinder after the intake control valve has opened, based upon opening timing of the intake control valve, closing timing or an opening period of the intake control valve, and a pressure at a downstream side of the intake control valve at the opening timing of the intake control valve.

Abstract: A carburetor for a high performance vehicle includes an actuator lever mounted to a first valve linkage for rotating a first pair of carburetor butterfly valves and a crank mounted to a second valve linkage for rotating a second pair of carburetor butterfly valves, a cam mounted on the actuator lever for engaging and moving said crank and rotating said second pair of valves in response to the movement of the actuator lever, and a quick disconnect coupling between said actuator lever and said cam such that the cam is removable from said actuator lever and can be replaced by another cam.