JP2002285862A - Intake control device for fuel injection type engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a space-saving intake control device for a fuel injection type engine capable of attaining both of control of a sub-throttle valve and FID control in intake control and automatic control of fast idling by means of a simple structure. SOLUTION: This intake control device 100 for the fuel injection type engine 30 is provided with a throttle body 50 having a main throttle valve 51 and the sub-throttle valve 52 arranged on the intake upstream of an injector and an interlocking mechanism 60 forcibly turning the main throttle valve 51 in the opening direction by a minute angle when the main throttle valve 51 is fully closed substantially and the sub-throttle valve 52 is fully opened substantially. The interlocking mechanism 60 is arranged between intake passages adjacently arranged in the substantially central part of the throttle body 50 having a plurality of intake passages arranged in parallel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake control system for an engine, and more particularly to an intake control system for a fuel injection engine having a sub-throttle valve.

[0002]

2. Description of the Related Art Generally, an internal combustion engine such as an on-vehicle engine is provided with a piston reciprocally movable within a cylinder block, and the piston is connected to a crankshaft of the internal combustion engine via a connecting rod. The reciprocating movement of the piston is converted into rotation of the crankshaft by the connecting rod.

A cylinder head is mounted on the cylinder block, and a combustion chamber is provided between the cylinder head and the head of the piston. The cylinder head is provided with an intake passage and an exhaust passage that communicate with the combustion chamber.
This intake passage is provided with a throttle valve for controlling the amount of air flowing through the intake passage, and an injector for injecting fuel into the intake passage toward the combustion chamber. The cylinder head is provided with a spark plug for igniting the mixed gas in the combustion chamber.

In the intake stroke of the internal combustion engine,
Air is sucked into the intake passage toward the combustion chamber, and fuel is injected from the injector, and the combustion chamber is filled with a mixed gas consisting of the air and the fuel. Thereafter, in the compression stroke of the internal combustion engine, the mixed gas in the combustion chamber is compressed by the movement of the piston. The compressed gas mixture is ignited by the spark plug and explodes, and the explosive force causes the piston to move in the opposite direction to move the internal combustion engine to the explosion stroke.
Thereafter, in the exhaust stroke of the internal combustion engine, the exhaust gas in the combustion chamber is discharged to the outside via the exhaust passage by the movement of the piston.

In the engine configured as described above,
In recent years, a known intake control method is to provide a sub-throttle valve in an intake passage and open and close the sub-throttle valve in accordance with the operation state of the engine to perform optimal intake control. When the main throttle valve is rapidly operated from the low opening state to the high opening state at the time of low engine rotation, the intake air does not flow smoothly near the main throttle valve, and there is a moment when rattling occurs. At this time, by fully closing the sub-throttle valve on the upstream side of the main throttle valve, an increase in the intake air amount according to the operation of the main throttle valve can be realized, and the engine rotation smoothly increases. On the other hand, when the engine is running at high speed, if the sub-throttle valve is closed, the intake resistance increases and the intake efficiency decreases, so that the sub-throttle valve is fully opened so as not to prevent an increase in intake air volume.

For example, as disclosed in Japanese Utility Model Laid-Open No. 3-116740, a first throttle valve and a second throttle valve are provided in an intake passage.
There has been proposed an arrangement in which the throttle valve is disposed to perform optimal intake control by performing air control based on the engine temperature. According to this method, since the intake passage is controlled by providing the bypass passage in the intake passage, it is possible to prevent the engine from stalling even in a cold state in which the second throttle valve is fully closed.

Further, as disclosed in Japanese Utility Model Publication No. 5-31231, a first throttle valve and a second throttle valve are arranged in an intake passage, and these two throttle valves are linked by a link mechanism. Then, with the first throttle valve reaching the fully open position,
There has been proposed one in which the second throttle valve is forcibly brought into a fully closed state. According to this method, a trouble occurs in the first throttle valve interlocked with the accelerator and the control becomes impossible,
When the first throttle valve reaches the fully open position, the second throttle valve can be forcibly fully closed to stop the engine, so that safety can be ensured.

[0008]

However, in the above-mentioned system employing the second throttle valve, that is, a so-called sub-throttle valve, a motor is generally used as an actuator for driving the sub-throttle valve. At present, the motor is used only for controlling the sub-throttle valve. Since the motor for the sub-throttle valve is generally arranged at the end of the throttle body, there is a problem that the width of the throttle body is wide and occupies a limited space.

Further, since the sub-throttle valve is operated from the end of the throttle body, the shaft for operating the sub-throttle valve needs to have strength, and accordingly, there is a problem that the number of parts increases and the cost increases. Was. Further, the sub-throttle valve is effective when the main throttle valve is in the middle to high opening operation state of the engine, and cannot be effective when the main throttle valve is closed.

There is also known a system in which FID (first idle) at the time of starting the engine is controlled by controlling the bypass passage area with cooling water and wax, but the engine speed is maintained at a high speed until the water temperature rises. There is a problem that idling operation is performed in this state and controllability is poor. Further, it is necessary to secure a bypass passage, which causes a problem that the cost and weight increase.

On the other hand, as a problem of the conventional engine, in the case of a system in which the FID lever is manually operated at the time of cold start of the engine, even after the warm-up operation, the lever is forgotten to be returned and left in the FID state. In some cases, normal operation is performed, which is not preferable for the engine and the environment.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a simple structure that can achieve both the control of the sub-throttle valve and the FID control in the intake control and the automatic control of the first idle. It is an object of the present invention to provide an intake control device for a fuel-injection engine that has a small space.

[0013]

SUMMARY OF THE INVENTION The present invention relates to an intake control system for a fuel injection type engine, and more particularly, to an intake passage for supplying intake air to a combustion chamber of the engine, an injector for injecting fuel into the intake passage, and the injector. A fuel injection engine having a throttle body having a main throttle valve and a sub-throttle valve disposed on the upstream side of the intake air, wherein the main throttle valve is substantially fully closed and the sub-throttle valve is substantially closed in the throttle body. In the intake control device for a fuel injection type engine including an interlocking mechanism for forcibly turning the main throttle valve in the opening direction by a small angle when fully opened, the throttle body includes:
A plurality of intake passages are provided in parallel, and the interlocking mechanism is disposed between intake passages arranged adjacent to substantially the center of the throttle body.

Further, the fuel injection engine is an engine in which a plurality of cylinders are arranged in parallel and a cam chain is arranged within a cylinder pitch located at the center of the cylinders arranged in parallel. It is preferable that the throttle body is disposed at the rear of the throttle body and the interlocking mechanism is disposed at a position of the throttle body facing the cam chain.

Preferably, the sub-throttle valve is opened and closed by a drive motor, and the drive motor is disposed between the same intake passages in which the interlocking mechanism is disposed.

The sub-throttle valve protrudes one end of the valve shaft from the inside of the intake passage to the outside, and a cam is provided at the protruding end so as to rotate integrally with the valve shaft. It is preferable that the cam is brought into contact with the interlocking mechanism at a position where the main throttle valve is rotated close to rotate the main throttle valve in the opening direction.

Further, the present invention comprises a plurality of cylinders,
An intake passage for supplying intake air to a combustion chamber of an engine, an injector for injecting fuel into the intake passage, and an injector for disposing the cylinder in a slanted front and rear so as to be substantially V-shaped when viewed from the side of the vehicle; A fuel injection engine having a throttle body having a main throttle valve and a sub-throttle valve disposed on the upstream side of the intake air, wherein the main throttle valve is substantially fully closed and the sub-throttle valve is substantially closed in the throttle body. In the intake control device for a fuel injection engine provided with an interlocking mechanism for forcibly turning the main throttle valve by a small angle in the opening direction when fully opened, the throttle body is provided between banks of cylinders inclined forward and rearward, respectively. And the intake passages for supplying intake air to the cylinders are substantially parallel to each other. The throttle body is arranged in a row, the interlocking mechanism is provided on one of the throttle bodies, and a link mechanism for connecting one main throttle valve and the other main throttle valve rotated by the interlocking mechanism is provided. It may be.

Further, on one side of the throttle body,
A sub-throttle connecting bar for connecting and interlocking the sub-throttle valves is arranged, and a main throttle connecting bar for connecting and interlocking the main throttle valves is arranged on a side of the throttle body opposite to the sub-throttle connecting bar. Is preferred.

According to the present invention, in the intake control device for a fuel injection type engine, the interlocking mechanism exposed outside the throttle body is provided with the intake mechanism disposed substantially at the center of the plurality of throttle bodies arranged side by side. By arranging the passages between the passages, the operability of each sliding portion is not impaired even in long-term use without direct exposure to wind and rain. In addition, parts around the interlocking mechanism have minute gaps between them and other parts. If small stones or sand is caught in these gaps, malfunctions may occur. Since the interlocking mechanism is arranged in a difficult place, accurate operation can be realized.

A fuel injection engine in which a plurality of cylinders are arranged in parallel and a cam chain for driving a valve gear is arranged within a cylinder pitch located at the center of the cylinders arranged in parallel is a fuel injection engine. By setting the disposition position at the center of the vehicle width direction, the weight balance in the vehicle width direction can be equalized, and by disposing the cam driven gear approximately at the center of the cam shaft, bending and bending of the cam shaft can be reduced. In addition to this, there is an advantage that the load applied to the camshaft bearing can be evenly distributed, and the cylinder pitch of the cylinder located at the center among the juxtaposed cylinders is wider than the others. Therefore, by disposing a throttle body behind the cylinder and disposing an interlocking mechanism at a position of the throttle body facing the cam chain, the intake passage shape corresponding to each cylinder can be made uniform. Variations in output for each cylinder can be suppressed.

Also, a drive motor is employed as an actuator for opening and closing the sub-throttle valve, and the drive motor is disposed between the same intake passages in which the interlocking mechanism is disposed so as to face the cam chain. Space efficient placement possible.

The sub-throttle valve is set so as to open as the engine rotates at a high speed. The sub-throttle valve does not frequently open almost completely on a general road. If such a part is always in contact with another part, the wear resistance will be poor. Therefore, at the position where the sub-throttle valve is rotated to near the fully open position, the cam is brought into contact with the interlocking mechanism to rotate the main throttle valve in the opening direction, so that the movement of the main throttle valve is controlled by the movement of the sub-throttle valve. When it is not necessary to link the cams with each other, the contact between the cam and the link mechanism is cut off, so that a device with good wear resistance can be realized.

Also, in an engine having cylinders inclined in a V-shape and having a throttle body corresponding to each cylinder and supplying intake air, the throttle body is disposed between banks of cylinders inclined forward and rearward. An intake passage for supplying intake air to each of the cylinders is arranged substantially in parallel and in parallel, and the interlocking mechanism is provided on one of the throttle bodies, and one main throttle valve and the other main throttle valve rotated by the interlocking mechanism are provided. By providing a link mechanism for connecting the main throttle valves of the respective throttle bodies, the FI
The movement of the main throttle valve in the D control can be unified.

Also, on one side of the throttle body,
A sub-throttle connecting bar that connects and interlocks the sub-throttle valves is arranged, and a main throttle connecting bar that connects and interlocks the main throttle valves is arranged on the side of the throttle body opposite to the sub-throttle connecting bar. Thus, it can be evenly extended on both sides of the throttle body.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 5 show an example of an embodiment of the present invention. FIG. 1 shows an entire motorcycle equipped with an engine employing an intake control device for a fuel injection engine according to a first embodiment of the present invention. FIG. 2 is a plan sectional view showing the structure of a device in the cylinder head of the engine, FIG. 3 is a plan view showing the structure of a throttle body according to the present embodiment, and FIG. FIG. 5 is a sectional view taken along the line A and showing the structure of an interlocking mechanism when the sub-throttle valve is fully closed. FIG. 5 is a sectional view taken along the line AA of FIG. FIG. 5 is a throttle body configuration diagram showing a configuration of an interlocking mechanism in a state. In the drawings, the portions denoted by the same reference numerals as those in the drawings represent the same items.

In the first embodiment, as shown in FIG. 1, in a motorcycle 1, a front fork 4 for supporting a front wheel 3 is rotatable left and right by a handle bar 5 on the front head of a body frame 2 of the motorcycle. On the other hand, a swing arm 9 extending rearward and pivotally supporting a rear wheel 8 is supported on a pivot shaft 7 erected at the center of the body frame 2 so as to be vertically rotatable. The arm 9 is buffer-suspended by a suspension mechanism (not shown) provided at a base end thereof.

The body frame 2 includes a head pipe 2a.
And a pair of left and right main frames 2b extending in the vehicle width direction and extending diagonally downward and rearward in the vehicle front-rear direction, and a cylinder head 31 is disposed below the main frame 2b in a lower front part of the vehicle body frame 2. Engine 30
Is suspended. The power of the engine 30 is transmitted to the rear wheel 8 by the chain 11.

The engine 30 is provided with a water temperature sensor (not shown) for detecting a cooling water temperature of the engine, and an electronic control unit (not shown) for inputting a detection value from the water temperature sensor and controlling opening and closing of a sub-throttle valve 52 described later. )). The electronic control unit opens the sub-throttle valve 52 fully for a certain period of time when the water temperature input at the time of starting the engine is lower than a set value.

An air cleaner (not shown) is disposed behind the engine 30. An exhaust pipe 13 extending to the lower side of the engine 30 and extending rearward toward the lower side of the engine 30 is connected to a front portion of the engine 30. Further, the exhaust pipe 13 extends from the lower side of the engine 30 to the right side in the vehicle width direction. The exhaust muffler 14 is connected to the rear wheel 8 so as to extend rearward.

A radiator 17 is provided in front of the engine 30. The radiator 17 is a cooling water pump (not shown) provided on the side of the engine 30.
To a cooling water hose (not shown).
A fuel tank 21 is installed above the engine 30, and a seat 22 is detachably mounted on a rear portion of the fuel tank 21. The lower portion and the periphery of the rear portion of the seat 22 are covered with a rear frame cover 23. The rear frame cover 23 is a molded product of a synthetic resin.

The engine 30 is a four-cylinder four-cycle engine, in which a piston (not shown) is reciprocally movable within a cylinder block 32, and the piston is connected to the engine 30 via a connecting rod (not shown). Is connected to a crankshaft (not shown) which is an output shaft of the motor. The reciprocating motion of the piston is converted into a rotational motion of the crankshaft by the connecting rod. At the upper end of the cylinder block 32, a cylinder head 31 is provided.

As shown in FIG. 2, the cylinder head 31 rotatably supports an intake camshaft 41 and an exhaust camshaft 42 for opening and closing an intake valve and an exhaust valve. The intake camshaft 41 and the exhaust camshaft 42 are connected to a crankshaft (not shown) via a camchain 43, and the rotation of the crankshaft is transmitted to the intake camshaft 41 and the exhaust camshaft 42 by the camchain 43. It has become so.

The cam chain 43 is disposed substantially at the center of the intake camshaft 41 and the exhaust camshaft 42, that is, substantially at the center in the vehicle width direction of the engine 30, and substantially perpendicular to each camshaft.

When the intake camshaft 41 rotates,
An intake valve (not shown) is driven to open and close, and an intake port (not shown) and a combustion chamber (not shown) are communicated / cut off. When the exhaust camshaft 42 rotates, an exhaust valve (not shown) is driven to open and close, so that an exhaust port (not shown) and the combustion chamber are communicated / cut off.

A suction pipe (not shown) and an exhaust manifold (not shown) are connected to the intake port and the exhaust port, respectively. The inside of the suction pipe and the inside of the intake port form an intake passage, and the inside of the exhaust manifold and the inside of the exhaust port form an exhaust passage. As shown in FIG. 1, the intake passage is provided rearward of the engine 30, and a throttle body 50 is disposed upstream of a suction pipe. The exhaust passage is provided in front of the engine 30.

The throttle body 50 is shown in FIGS.
, Four intake passages 5 are arranged behind four cylinders arranged side by side in the vehicle width direction.
0a, 50b, 50c and 50d are arranged in parallel, and a main throttle valve 51 which opens and closes in conjunction with the operation of the throttle grip 70, and a sub throttle valve 52 which opens and closes by a motor 54 in accordance with the operating condition of the engine 30.
An injector 120 for injecting fuel is provided, and an interlocking mechanism 60 is provided between intake passages 50b and 50c which are located at a position facing the cam chain 43 and substantially adjacent to the center of the throttle body 50. Is provided.

As shown in FIG. 4, the sub-throttle valve 52 is disposed upstream of the main throttle valve 51 in the air flow direction.
0 is arranged downstream of the main throttle valve 51 in the air flow direction.

The main throttle valve 51 has a valve shaft 5 rotatably mounted on the throttle body 50.
5 is integrally attached. 4, one end 55a of the outer periphery of the throttle body 50 of the valve shaft 55
As shown in FIG. 5, a main throttle pulley 56 for operating the main throttle valve 51 is provided on the valve shaft 5.
5 are provided integrally.

On the outer periphery of the main throttle pulley 56, a stopper portion 56a which is positioned in contact with a valve position adjusting bolt 66 disposed close to the main throttle pulley 56 is provided so as to protrude outward from the outer periphery.

The main throttle pulley 56 operates via a throttle wire (not shown) pushed and pulled in conjunction with the operation of a throttle grip 70 operated by the driver to open and close the main throttle valve 51. Have been. By adjusting the opening degree of the main throttle valve 51, the amount of air taken into the combustion chamber is adjusted.

The sub-throttle valve 52 has a valve shaft 58 rotatably mounted on the throttle body 50.
It is integrally attached to. One end of the valve shaft 58 protrudes from the inside of the throttle body 50 to the outside thereof.
A (first idle) cam 61 is provided, and at a position where the sub-throttle valve 52 is rotated to near the fully open position,
The main throttle valve 51 is rotated in the opening direction by contacting the FID cam 61 with an interlocking mechanism 60 described later. The FID cam 61 has a circular shape with a different diameter, and a first FID link 6 described later on a large-diameter portion on an outer peripheral portion thereof.
2, a cam operating portion 61a is formed.

The valve shaft 58 is connected to a valve driving motor 54 so that a driving force is directly applied to the sub throttle valve 52. The motor 54 is disposed between the centrally located intake passages 50b and 50c.

The interlocking mechanism 60 includes a throttle body 5
0 is provided adjacent to the FID cam 61 on the outer peripheral portion,
When the main throttle valve 51 is substantially fully closed and the sub throttle valve 52 is substantially fully opened, the main throttle valve 51 is forcibly rotated by a small angle in the opening direction. The first FID link 62 to be received and the first FID link 6
A second FID link 64 that receives the second operation via the coil spring 63.

The first FID link 62 has one end 62
a is a free end and is disposed close to the FID cam 61, and is pivotally supported on the outer periphery of the throttle body 50 with the other end 62b as a fulcrum. A sub-throttle valve-side pin body 62c, which comes into contact with the cam operation portion 61a of the FID cam 61, protrudes from the one end portion 62a.

The second FID link 64 is connected to the first end 6
4a is formed as a free end so as to protrude within the swing range of the first FID link 62, is disposed via a coil spring 63, and is pivotally supported on the other end 64b as a fulcrum coaxially with the first FID link. A second end 64c extends as another free end at a position where it abuts a part of the main throttle pulley 56. The second end 64c
Is provided with a main throttle valve side pin body 64d which is in contact with a part of the main throttle pulley 56.

Next, the intake control device 10 according to the present embodiment
The operation of the main throttle valve 51 and the sub throttle valve 52 will be described with reference to the drawings. FIG. 4 is a throttle body configuration diagram showing the operation of the interlocking mechanism 60 when the sub-throttle valve 52 is fully closed, and FIG. 5 is an interlocking mechanism 60 when the sub-throttle valve 52 is fully open.
FIG. 4 is a configuration diagram of a throttle body showing the operation of FIG.

First, when the engine is stopped, as shown in FIG. 4, the sub-throttle valve 52 is fully closed, and the sub-throttle valve 52 is arranged substantially horizontally in the drawing. The cam operating portion 61a of the FID cam 61 is arranged at a position where one end 62a of the first FID link 62 does not contact the sub throttle valve side pin body 62c.
At this time, the main throttle valve 51 is in a fully closed state, and the stopper portion 56a positions the main throttle valve 51 in a state of being in contact with the valve position adjusting bolt 66.

Next, when the engine is cold started, the sub-throttle valve 52 is fully opened as shown in FIG.
The sub-throttle valve 52 is rotated substantially 90 degrees counterclockwise and opened substantially in parallel with the axial direction of the intake passage. During the full closing operation, the FID cam 61 swings approximately 90 degrees counterclockwise, the cam operating portion 61a contacts the sub throttle valve side pin body 62c, and the cam operating portion 61a further swings counterclockwise. Then, the first FID link 62 swings clockwise.

Here, after the coil spring 63 is compressed by a predetermined amount, the spring force wins and the second FID link 64 swings clockwise. The main throttle pulley 5
6, the main throttle valve side pin body 64 in contact with
d swings clockwise (upward in the figure). This allows
The main throttle pulley 56 rotates counterclockwise, and accordingly, the main throttle valve 51 rotates counterclockwise so as to open at a small angle.

In this way, by fully opening the sub-throttle valve 52 at the time of cold start of the engine, the main throttle valve 51 can be opened at a predetermined minute angle (for example, approximately 1 degree) required for first idling. .

After idling operation for a predetermined time after the engine is started, the sub-throttle valve 52
Is rotated clockwise and returned to the fully closed position again. As a result, the first FID link 62 swings counterclockwise and the second FID link 64 is returned, so that the stopper 56a of the main throttle pulley 56 is returned clockwise until it comes into contact with the valve position adjusting bolt 66. Thus, the main throttle valve 51
Can be brought into a normal operation state.

According to the first embodiment, the main throttle valve 51 and the sub throttle valve 52 are linked by the link mechanism 60 according to the first embodiment. The main throttle valve 51 can be opened by an angle.
In addition, since the plurality of throttle bodies provided below the fuel tank 21 are disposed between the intake passages disposed substantially adjacent to the center thereof, the respective sliding portions are not directly exposed to the wind and rain and can be used for a long period of time. There is an advantage that operability is not impaired.

Further, according to the present embodiment, the engine state at the time of starting the engine is detected by the water temperature sensor, and the first idling is performed for a certain period of time. Startability can be improved.

Further, according to the present embodiment, since the fuel injection type engine in which the cam chains 43 are arranged within the cylinder pitch located at the center of the cylinder heads 31 arranged in parallel is adopted, the cylinder heads arranged in parallel are arranged. By arranging the throttle body 50 behind the cylinder head 31 at the center where the cylinder pitch of the cylinder 31 is wider than the other, and arranging the interlocking mechanism 60 at a position of the throttle body 50 facing the cam chain, Since the shape of the intake passage corresponding to each cylinder can be made uniform over a short distance, it is possible to suppress variations in the output of each cylinder.

Further, the motor 54 is employed as an actuator for opening and closing the sub-throttle valve 52, and the motor is disposed at a position facing the cam chain 43 between the same intake passages in which the interlocking mechanism 60 is disposed. This makes it possible to lay out a space-efficient intake control device that takes advantage of dead space.

In this embodiment, the FID is set at a position where the sub-throttle valve 52 is rotated to near the fully opened position.
Since the cam 61 abuts on the sub-throttle valve side pin body 62c, when there is no need to link the movement of the main throttle valve 51, the abutment between the FID cam 61 and the sub-throttle valve side pin body 62c should be cut off. Thus, an intake control device having good wear resistance can be realized.

In the present embodiment, the case where a water-cooled engine is adopted has been described as an example, but an oil-cooled engine or an air-cooled engine may be used. In this case, it goes without saying that a means for detecting the cylinder head temperature such as an oil temperature sensor may be used instead of the water temperature sensor (not shown) of the present embodiment.

In this embodiment, a link mechanism is employed as the interlocking mechanism 60 for interlocking the main throttle valve 51 and the sub throttle valve 52. However, the present invention is not limited to this. The components of the interlocking mechanism may employ a chain to interlock the throttle valves, or may employ a gear to transmit the operation of each throttle valve.

In the present embodiment, the intake control device of the present invention is adopted for a parallel four-cylinder engine. However, the present invention is not limited to the arrangement of engines and the number of cylinders. The present invention may be applied to a cylinder engine or a single cylinder engine.

Next, a second embodiment will be described in detail with reference to the drawings. 6 to 9 show a second embodiment of the present invention. FIG. 6 is an overall side view showing the configuration of an engine employing an intake device for a fuel injection engine according to a second embodiment of the present invention. FIG. 8 is a sectional view taken along the line BB in FIG. 6, FIG. 8 is a throttle body configuration diagram showing a configuration of an interlocking mechanism when the sub-throttle valve is fully closed, and FIG. 9 is an interlocking mechanism when the sub-throttle valve is fully open. FIG. 3 is a configuration diagram of a throttle body showing the configuration of FIG. In the drawings, the portions denoted by the same reference numerals as those in the drawings represent the same items.

As shown in FIG. 6, the second embodiment is an engine mounted on a motorcycle, and includes two cylinder blocks 132a,
In this embodiment, an intake control device 200 for a fuel injection engine according to the present invention is employed for an engine 130 in which 132b is arranged to be inclined forward and backward.

The engine 130 has a water temperature sensor (not shown) for detecting the cooling water temperature of the engine, and an electronic control device (not shown) for inputting a detection value from the water temperature sensor and controlling opening and closing of a sub-throttle valve 152 described later. ) Is a fuel injection type engine provided with the intake control device 200 having the following. The electronic control unit fully opens the sub-throttle valve 152 for a certain period of time when the water temperature input at the time of starting the engine is lower than a set value.

The engine 130 is a two-cylinder type 4
A cycle engine comprising a cylinder block 132
a, 132b, a piston (not shown) is provided so as to be able to reciprocate, and the piston is connected to a crankshaft (not shown) which is an output shaft of the engine 130 via a connecting rod (not shown). The reciprocating motion of the piston is converted into a rotational motion of the crankshaft by the connecting rod. A cylinder head 131 is provided at the upper end of each of the cylinder blocks 132a and 132b.
a and 131b are provided.

An air cleaner 140 is arranged above the engine 130. Cylinder block 132a
A front exhaust pipe 113 is connected to the front of the cylinder block 132a and extends downward under the cylinder block 132a and extends rearward.
It extends rearward from the lower side of the engine 130 along the right side in the vehicle width direction. A radiator 117 is provided in front of the engine 130. The radiator 117 is connected to a cooling water pump (not shown) provided on the side of the engine 130 via a cooling water hose (not shown). ing.

As shown in FIGS. 6 to 9, the intake control device 200 includes an intake passage 210 for supplying intake air to the combustion chamber.
And an injector 2 for injecting fuel into the intake passage 210
20 and a main throttle valve 151 and a sub-throttle valve 15 on the upstream side of the intake of the injector 220.
2 with a main throttle valve 151 attached to the throttle body 150.
Is provided with an interlocking mechanism 160 for forcibly rotating the main throttle valve 151 by a small angle in the opening direction when the sub throttle valve 152 is substantially fully closed and the sub throttle valve 152 is substantially fully opened.

The injector 220 is arranged inside between the throttle bodies 150 arranged side by side.
The upper part is connected to a delivery pipe 221 communicating with a fuel pump (not shown), and fuel is supplied from the fuel pump.

As shown in FIG. 6, the throttle body 150 is disposed between the banks of the cylinder blocks 132 inclined forward and rearward at two locations adjacent to the cylinder blocks 132, and is connected to each cylinder. An intake passage 210 for supplying intake air is formed integrally.

The throttle body 150 is similar to that shown in FIG.
As shown in FIG. 8, an FID cam 161 that rotates integrally with the sub-throttle valve 152 is provided on one side of the outer peripheral portion thereof.
And the main throttle pulley 1 that rotates the main throttle valve 151 in response to the rotation of the FID cam 161.
A sub-throttle connecting bar 164 is provided for connecting the sub-throttle valves 152 together with the sub-throttle connecting bar
Is arranged.

On the other hand, one side of the throttle body 150
That is, on the side of the throttle body 150 opposite to the sub-throttle connecting bar 164, a main throttle connecting bar 165 for connecting and interlocking the main throttle valves 151 is provided.

A main throttle valve 151 is disposed near the center of the throttle body 150, and the sub throttle valve 152 is disposed upstream of the main throttle valve 151 in the air flow direction. An injector 220 is disposed downstream in the air flow direction.

The main throttle valve 151 is integrally mounted on a valve shaft 155 rotatably mounted near the center of the throttle body 150.
As shown in FIGS. 7 to 9, a main throttle pulley 156 for operating the main throttle valve 151 is integrally provided at one end 155 a of the outer periphery of the throttle body 150 of the valve shaft 155.

On the outer periphery of the main throttle pulley 156, a stopper portion 156a which is positioned in contact with a valve position adjusting bolt 166 disposed close to the main throttle pulley 156 is provided so as to project outward in the outer peripheral direction. At a position near the sub throttle valve 152, an operation lever 156b provided with a sub throttle valve side pin body 156c abutting on the FID cam 161 is provided so as to protrude outward in the outer peripheral direction.

The sub-throttle valve 152 is integrally mounted on a valve shaft 158 which is rotatably mounted on the throttle body 150. One end of a valve shaft 158 of one throttle body 150 protrudes from the inside of the throttle body 150 to the outside.
The FID cam 161 is provided at 58a so as to rotate integrally with the valve shaft 158.

The FID cam 161 has a circular shape with a different diameter, and a cam operating portion 161a that contacts the sub-throttle valve side pin body 156c is formed in a large-diameter portion on the outer periphery thereof, and the sub-throttle valve 152 is fully opened. At the position where the FID cam 161 is rotated to the vicinity, the FID cam 161 is brought into contact with a sub throttle valve side pin body 156c provided on an operation lever 156b protruding from the main throttle pulley 156 to rotate the main throttle valve 151 in the opening direction. It has been like that.

The other end of the valve shaft 158, that is, the end on the side opposite to the FID cam installation side, has a motor 1 for driving the valve.
54 are connected.

As a component of the interlocking mechanism 160, the anti-main throttle pulley 15 of the throttle body 150 is provided.
The main throttle lever 1 is mounted on a valve shaft 155 to which a main throttle pulley 156 is attached on an outer peripheral portion on the 6th side.
62a is provided integrally with the valve shaft 155.

A main throttle lever 162b is also provided on the outer peripheral portion of the other throttle body 150 on the same side as the main throttle lever 162a.
The main throttle levers 162a and 162b are connected by a main throttle connection bar 165 so that opening and closing operations of the main throttle valve 151 are linked.

A valve shaft 158 to which the FID cam 161 is attached is provided on the outer peripheral portion of the throttle body 150.
Is provided with a sub-throttle lever 167a integrally with the valve shaft 158.

A sub-throttle lever 167b is also provided on the outer peripheral portion of the other throttle body 150 on the same side as the sub-throttle lever 167a. The sub-throttle levers 167a and 167b are connected by a sub-throttle connecting bar 164 so as to interlock the opening and closing operation of the sub-throttle valve 152.

Next, the intake control device 2 according to the second embodiment
The operation of the main throttle valve 151 and the sub throttle valve 152 at 00 will be described with reference to the drawings.
FIG. 8 is a throttle body configuration diagram showing the configuration of the link mechanism when the sub-throttle valve 152 is fully closed, and FIG.
FIG. 7 is a throttle body configuration diagram showing a configuration of a link mechanism when a sub throttle valve 152 is in a fully opened state.

First, when the engine is stopped, the sub-throttle valve 152 is fully closed as shown in FIG.
The sub-throttle valve 152 is disposed substantially horizontally on the drawing. Further, the cam operation unit 16 of the FID cam 161
1a is disposed at a position where the main throttle pulley 156 is not in contact with the sub throttle valve side pin body 156c. At this time, the main throttle valve 151 is fully closed and the stopper portion 156a is in contact with the valve position adjusting bolt 166 so that the main throttle valve 151 is closed.
Is positioned.

Next, at the time of cold start of the engine, as shown in FIG. 9, the sub-throttle valve 152 is fully opened, and the sub-throttle valve 152 is rotated substantially 90 degrees counterclockwise to move in the axial direction of the intake passage. It is opened almost in parallel. As a result, the FID cam 161 moves approximately 90 degrees counterclockwise.
And the cam operating portion 161a comes into contact with the sub throttle valve side pin body 156c.
As a swings counterclockwise, the main throttle pulley 156 rotates clockwise. As a result, the main throttle valve 151 rotates in a direction to open clockwise by a small angle.

In this way, by fully opening the sub-throttle valve 152 at the time of cold start of the engine, the main throttle valve 151 can be opened at a predetermined minute angle (for example, approximately 1 degree) required for first idling. .

After the engine has been idling for a predetermined time after starting the engine, the sub-throttle valve 15
2 is rotated clockwise and returned to the fully closed position again.
Accordingly, the main throttle pulley 156 rotates counterclockwise, and is returned clockwise until the stopper portion 156a contacts the valve position adjusting bolt 166. Thus, the main throttle valve 151 can be brought into a normal operation state.

According to the second embodiment, since the intake control device 200 is installed between the banks of the cylinders of the V-type engine according to the second embodiment, the throttle body 15
In addition to being able to integrally form the intake passage including zero, it is possible to realize a space-efficient intake control device utilizing dead space.

Further, an interlocking mechanism 160 is provided on one side of the throttle body 150 by a FID cam 161 which rotates integrally with the sub-throttle valve 152,
The main throttle pulley 156 is provided for rotating the main throttle valve 151 in response to the rotation of the main throttle valve 151. The rotation of the main throttle pulley 156 is controlled by the main throttle lever 16 provided on the other main throttle valve 151.
2b so that each throttle body 1
50 main throttle valves 151 are connected to each other,
The movement of the main throttle valve 151 in the FID control can be unified.

According to the present embodiment, the sub throttle connection bar 164 is provided on one side of the throttle body 150.
And the main throttle connection bar 165 is arranged on the side of the throttle body 150 opposite to the sub throttle connection bar 164.
0 can be evenly extended on both sides, and the intake control device can be configured in a well-balanced manner.

Further, according to this embodiment, the engine state at the time of starting the engine is detected by the water temperature sensor, and the first idle is performed for a certain period of time. Startability can be improved.

In the present embodiment, the case where a water-cooled engine is adopted has been described as an example, but an oil-cooled engine or an air-cooled engine may be used. In this case, it goes without saying that a means for detecting the cylinder head temperature such as an oil temperature sensor may be used instead of the water temperature sensor (not shown) of the present embodiment.

Further, in this embodiment, a link mechanism is employed as an interlocking mechanism between the main throttle valve and the sub-throttle valve. However, the present invention is not limited to this. The operation of each throttle valve may be used in conjunction with each other, or the operation of each throttle valve may be transmitted using a gear.

In this embodiment, the motor 154 for driving the sub-throttle valve 152 is disposed on the same throttle body 150 side as the main throttle pulley 156. However, the present invention is limited to the installation position of the motor. However, for example, the main throttle pulley 156 may be arranged on another throttle body side. Further, in the present embodiment, the intake control device of the present invention is employed in a V-type two-cylinder engine.
The invention is not limited to the configuration of the engine or the number of cylinders. For example, the invention may be applied to a V-type four-cylinder engine.

[0092]

As described above, the first aspect of the present invention is as described above.
According to the intake control apparatus for a fuel injection type engine described in any one of the above-described embodiments, it is possible to achieve both the control of the sub-throttle valve and the FID control in the intake control with a simple configuration, and to realize the space-saving fuel injection that can realize the fast idle automatic control. It is possible to realize an intake control device for an expression engine. More specifically, according to the present invention, in the intake control device for a fuel injection type engine, the interlocking mechanism exposed outside the throttle body is connected to the intake By arranging between the aisles, it is possible to realize an intake control device that is not directly exposed to the wind and rain and does not impair the operability of each sliding part even for long-term use. By providing an interlocking mechanism in a place where sand does not easily reach, an excellent effect that an accurate intake control operation can be realized is achieved.

Further, according to the present invention, in a V-type engine in which cylinders are arranged in a V-shape, a throttle body is arranged between banks of cylinders inclined forward and rearward to supply intake air to the cylinders. A cam body which is arranged in parallel with the passage substantially in parallel, and which is rotatable integrally with the sub-throttle valve on one of the throttle bodies;
By providing a main throttle pulley for rotating the main throttle valve in response to the rotation of the cam, and providing a link mechanism for transmitting the rotation of the main throttle pulley to a main throttle lever provided on the other main throttle valve. Thus, there is an excellent effect that the main throttle valves of the respective throttle bodies are connected to each other to unify the movements of the main throttle valves in the FID control.

[Brief description of the drawings]

FIG. 1 is an overall side view showing an overall configuration of a motorcycle equipped with an engine employing an intake control device for a fuel injection engine according to a first embodiment of the present invention.

FIG. 2 is a plan sectional view showing a device configuration in a cylinder head of the engine.

FIG. 3 is a plan view showing a configuration of a throttle body according to the embodiment.

4 is a cross-sectional view taken along the line AA of FIG. 3 and is a throttle body configuration diagram showing a configuration of an interlocking mechanism when a sub-throttle valve is in a fully closed state.

FIG. 5 is a sectional view taken along the line AA of FIG. 3 and is a throttle body configuration diagram showing a configuration of an interlocking mechanism when a sub-throttle valve is in a fully opened state.

FIG. 6 is an overall side view showing a configuration of an engine employing an intake device for a fuel injection engine according to a second embodiment of the present invention.

7 is a sectional view taken along the line BB in FIG. 6;

FIG. 8 is a throttle body configuration diagram showing a configuration of an interlocking mechanism when a sub-throttle valve according to the present embodiment is in a fully closed state.

FIG. 9 is a throttle body configuration diagram showing a configuration of an interlocking mechanism when the sub-throttle valve is fully opened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motorcycle 30, 130 Engine 31, 131 Cylinder head 32, 132 Cylinder block 41 Intake camshaft 42 Exhaust camshaft 43 Cam chain 50, 150 Throttle body 51, 151 Main throttle valve 52, 152 Sub throttle valve 54, 154 Motor 56 , 156 Main throttle pulley 60, 160 Interlocking mechanism 61, 161 FID cam 62 First FID link 64 Second FID link 100, 200 Intake control device 162a, 162b Main throttle lever 164 Sub throttle connection bar 165 Main throttle connection bar 167a, 167b Sub throttle Lever 220 Injector 221 Delivery pipe

Continued on the front page F term (reference) 3G065 AA04 BA01 CA22 CA23 DA05 DA06 DA15 EA01 EA02 FA07 GA09 GA41 HA02 HA03 HA06 HA12 HA20 HA21 HA22 JA03 JA11 KA02 KA05 KA12

Claims (6)

[Claims] An intake passage for supplying intake air to a combustion chamber of an engine, an injector for injecting fuel into the intake passage,
A fuel injection engine having a throttle body including a main throttle valve and a sub-throttle valve disposed on the intake upstream side of the injector,
An intake control device for a fuel injection engine, comprising an interlocking mechanism in the throttle body for forcibly turning the main throttle valve by a small angle in the opening direction when the main throttle valve is substantially fully closed and the sub throttle valve is substantially fully opened. The fuel injection engine according to claim 1, wherein the throttle body includes a plurality of intake passages arranged in parallel, and the interlocking mechanism is disposed between the intake passages arranged adjacent to substantially the center of the throttle body. Intake control device. 2. The fuel injection engine according to claim 1, wherein a plurality of cylinders are arranged in parallel, and a cam chain is arranged within a cylinder pitch located at the center of the cylinders arranged in parallel. 2. The intake control device for a fuel injection engine according to claim 1, wherein the throttle body is disposed behind the throttle body, and the interlocking mechanism is disposed at a position of the throttle body facing the cam chain. . 3. The sub-throttle valve is opened and closed by a drive motor, and the drive motor is disposed between the same intake passages in which the interlocking mechanism is disposed. Or an intake control device for a fuel injection engine according to 2. 4. The sub-throttle valve has one end of a valve shaft protruding from the inside of the intake passage to the outside, and a cam that rotates integrally with the valve shaft is provided at the protruding end, and the sub-throttle valve is fully opened. The fuel injection according to any one of claims 1 to 3, wherein the cam is brought into contact with the interlocking mechanism to rotate the main throttle valve in the opening direction at a position where the fuel injection valve is rotated to the vicinity. Intake control device for the engine. 5. An intake passage for supplying intake air to a combustion chamber of an engine, comprising a plurality of cylinders, wherein the cylinders are arranged to be inclined forward and backward so as to be substantially V-shaped when viewed from the side of the vehicle. A fuel injection engine having a throttle body including an injector for injecting fuel into a passage, and a main throttle valve and a sub throttle valve disposed on an intake upstream side of the injector, wherein a main throttle valve is provided on the throttle body. When the valve is substantially fully closed and the sub-throttle valve is substantially fully open, an intake control device for a fuel injection engine provided with an interlocking mechanism for forcibly rotating the main throttle valve by a small angle in the opening direction, wherein the throttle body comprises: Arranged between banks of cylinders, each of which is inclined forward and backward, and Parallel arranged substantially parallel to the intake passage for supplying people intake, said interlocking mechanism provided on one of said throttle body,
An intake control device for a fuel injection engine, comprising: a link mechanism for connecting one main throttle valve rotated by the interlocking mechanism and the other main throttle valve. 6. A sub-throttle connecting bar for connecting and linking the sub-throttle valves to one side of the throttle body, and a main throttle valve on a side of the throttle body opposite to the sub-throttle connecting bar. 6. The intake control device for a fuel injection engine according to claim 5, wherein a main throttle connection bar that connects and interlocks with each other is arranged.