JP4126881B2 - Intake control device for fuel injection engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intake control device for an engine, and more particularly to an intake control device for a fuel injection engine having a sub-throttle valve.
[0002]
[Prior art]
In general, in an internal combustion engine such as an in-vehicle engine, a piston is provided in a cylinder block so as to be reciprocally movable, 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 the rotation of the crankshaft by the connecting rod.
[0003]
A cylinder head is attached to 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 communicating with the combustion chamber. The intake passage is provided with a throttle valve for controlling the amount of air flowing through the 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.
[0004]
In the intake stroke of the internal combustion engine, air is sucked into the intake passage toward the combustion chamber, fuel is injected from the injector, and the combustion chamber is filled with a mixed gas composed of the air and 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 mixed gas is ignited by an ignition plug and explodes. Due to the explosive force, the piston moves 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 through the exhaust passage by the movement of the piston.
[0005]
In the engine configured as described above, in recent years, a method of performing optimal intake control by providing a sub-throttle valve in the intake passage and opening and closing the sub-throttle valve according to the operating state of the engine is known for intake control. ing.
When the main throttle valve is suddenly operated from a low opening state to a high opening degree when the engine is running at a low speed, there is a moment when the intake air does not flow smoothly near the main throttle valve, causing fluttering. 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 corresponding to the operation of the main throttle valve can be realized, and the engine speed rises smoothly.
On the other hand, when the sub-throttle valve is closed at the time of high engine speed, the intake resistance increases and the intake efficiency decreases. Therefore, the sub-throttle valve is fully opened so as not to prevent an increase in the intake air amount.
[0006]
For example, as disclosed in Japanese Utility Model Publication No. 3-116740, an optimal intake air can be obtained by arranging a first throttle valve and a second throttle valve in the intake passage and performing air control based on the engine temperature. There has been proposed a control system. According to this method, since the intake air is controlled by providing the bypass passage, it is possible to prevent the engine stall from occurring even when the second throttle valve is fully closed.
[0007]
In addition, as disclosed in Japanese Utility Model Publication No. 5-3231, the first throttle valve and the second throttle valve are arranged in the intake passage, and the two throttle valves are interlocked by a link mechanism. It has been proposed that the second throttle valve is forcibly fully closed in a state where the first throttle valve has reached the fully open position. According to this method, when the first throttle valve interlocked with the accelerator has trouble and becomes uncontrollable, and the first throttle valve reaches the fully open position, the second throttle valve is forcibly fully closed. Since the engine can be stopped, safety can be ensured.
[0008]
[Problems to be solved by the invention]
However, in the system employing the second throttle valve, that is, the so-called sub-throttle valve as described above, a motor is generally used as a drive actuator for the sub-throttle valve, and this motor controls the sub-throttle valve. It is currently used only for things. Since this sub-throttle valve motor is generally disposed at the end of the throttle body, there is a problem that the width of the throttle body becomes wide and occupies a limited space.
[0009]
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 be strong, and there is a problem that the number of parts is increased and the cost is increased accordingly.
Further, the sub-throttle valve is effective when the main throttle valve is in the middle to high opening state of the engine, and cannot be effective when the main throttle valve is closed.
[0010]
Also known is a method of performing FID (first idle) at the time of engine start by controlling the bypass passage area with cooling water and wax, but idling while maintaining the engine speed at a high speed until the water temperature rises. There is a problem that operation is performed and controllability is poor. Furthermore, there is a problem that it is necessary to secure a bypass passage, resulting in an increase in cost and weight.
[0011]
On the other hand, as a problem of the conventional engine, in the case of a method in which the FID lever is manually operated at the time of cold start of the engine, even after the warm-up operation is finished, the lever is forgotten to be returned and left in the FID state for normal operation. There is a problem that it is not preferable for the engine and the environment.
[0012]
The present invention has been made in view of the above-described problems of the prior art, and can save both space and fuel in a simple configuration, which can achieve both sub-throttle valve control and FID control in intake control, and can realize first idle automatic control. An object of the present invention is to provide an intake control device for an injection engine.
[0013]
[Means for Solving the Problems]
    An intake passage for supplying intake air to a combustion chamber of an engine, an injector for injecting fuel into the intake passage, and a throttle body including a main throttle valve and a sub-throttle valve disposed on the intake upstream side of the injector A fuel injection engine,
  The main throttle valve is integrally attached to a valve shaft that is rotatably attached to the throttle body and is opened and closed in conjunction with the operation of the throttle grip, while the sub-throttle valve is rotatably attached to the throttle body. In an intake control device for a fuel injection engine that is integrally attached to another valve shaft and that is opened and closed by a motor according to the operating state of the engine,
  The throttle body is
  A main throttle pulley is integrally provided at one end portion of the valve shaft of the main throttle valve, and a first idle cam is integrally provided at one end portion of the valve shaft of the sub throttle valve,
  During the cold start of the engine, the first throttle cam comes into contact with the first idle cam during the opening operation of the sub throttle valve from the fully closed state.On the other hand, at least when the sub-throttle valve is fully closed, a predetermined clearance is provided between the first throttle cam and the first idle cam so as not to contact each other.The first link,
  The operation of the first link is received via a coil spring and transmitted to the main throttle pulley.Thus, the main throttle valve is opened by a predetermined minute opening regardless of the operation of the throttle grip.A second link,
  The first link and the second linkWhen viewed in the valve axial direction of the main throttle valve, the throttle body is disposed more biased toward the injector mounting side than the central axis of the intake passage in the throttle body.An air intake control device for a fuel injection type engine.
[0014]
  Also,The first link is pivotally supported on the outer peripheral portion of the throttle body with one end of the first link as a fulcrum,
The second link is pivotally supported on the outer periphery of the throttle body coaxially with the first link with one end thereof as a fulcrum.It is preferred that
[0015]
  The fulcrum of the first link and the second link,As viewed in the valve axial direction of the main throttle valve, the throttle body is disposed more biased toward the injector mounting side than the central axis of the intake passage in the throttle body.It is preferable.
[0019]
  The present inventionofIn the intake control device for a fuel injection type engine, an interlocking mechanism that is exposed to the outside of the throttle body is disposed between the intake passages that are disposed adjacent to each other at substantially the center of the plurality of throttle bodies arranged in parallel. Thus, the operability of each sliding portion is not impaired even in long-term use without being directly exposed to wind and rain. In addition, the parts around the interlocking mechanism have a small gap with other parts. If a small stone or sand is caught in this gap, it may cause a malfunction. Accurate operation can be realized because the interlocking mechanism is installed in difficult places.
[0020]
Further, a fuel injection type engine in which a plurality of cylinders are arranged in parallel and a cam chain for driving a valve operating device is arranged in a cylinder pitch located in the center of the cylinders arranged in parallel. The weight balance in the vehicle width direction can be made uniform by setting the center in the vehicle width direction, and camshaft gears can be placed at the approximate center of the camshaft to suppress bending and bending of the camshaft. There is an advantage that the load applied to the camshaft bearing can be uniformly distributed, and among the cylinders arranged in parallel, the cylinder pitch of the one located at the center becomes wider than the others. Therefore, by arranging the throttle body at the rear of the cylinder and by arranging the interlocking mechanism at the location facing the cam chain of the throttle body, the intake passage shape corresponding to each cylinder can be made uniform. It is possible to suppress variations in output for each cylinder.
[0021]
Further, 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 where the interlocking mechanism is disposed so as to face the cam chain, thereby improving space efficiency. Can be placed.
[0022]
Further, the sub-throttle valve is set so as to open as the engine rotates at a high speed, and does not frequently fully open on a general road. If such a part is always brought into contact with another part, the wear resistance is poor. Therefore, at the position where the sub-throttle valve is rotated almost fully open, the main throttle valve is rotated in the opening direction by bringing the cam into contact with the interlocking mechanism, so that the movement of the main throttle valve is controlled. When it is not necessary to interlock, the apparatus configuration with good wear resistance can be realized by cutting off the contact between the cam and the interlocking mechanism.
[0023]
Further, in an engine having a cylinder inclined in a V shape and having a throttle body corresponding to each cylinder to supply intake air, the throttle body is disposed between banks of cylinders inclined forward and rearward, to the cylinder. Intake passages for supplying intake air are arranged in parallel in parallel, and the interlocking mechanism is provided on one of the throttle bodies, and one main throttle valve rotated by the interlocking mechanism is connected to the other main throttle valve. By providing the link mechanism that performs this, the main throttle valves of the throttle bodies can be connected to each other to unify the movement of the main throttle valve in the FID control.
[0024]
In addition, a sub-throttle connection bar that connects and links the sub-throttle valves is arranged on one side of the throttle body, and the main throttle valves are connected to the side of the throttle body opposite to the sub-throttle connection bar. In addition, by arranging the main throttle connecting bar that is linked together, it is possible to evenly project both sides of the throttle body.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIGS. 1 to 5 show an example of an embodiment of the invention. FIG. 1 is an overall view of a motorcycle equipped with an engine employing an intake control device for a fuel injection engine according to a first embodiment of the invention. 2 is a plan sectional view showing the configuration of the device in the cylinder head of the engine, FIG. 3 is a plan view showing the configuration of the throttle body according to the present embodiment, and FIG. FIG. 5 is a cross-sectional view taken along the line A, illustrating the structure of the interlocking mechanism when the sub-throttle valve is fully closed, and FIG. 5 is a cross-sectional view taken along the line A-A in FIG. It is a throttle body block diagram which shows the structure of the interlocking mechanism at the time of a state. In the figure, the same reference numerals as those in the figure denote the same parts.
[0026]
In the first embodiment, as shown in FIG. 1, in a motorcycle 1, a front fork 4 that pivotally supports a front wheel 3 is provided on a front head of a body frame 2 so as to be turnable left and right by a handle bar 5. On the other hand, a swing arm 9 extending rearward and pivotally supporting the rear wheel 8 is supported on the pivot shaft 7 installed at the center of the vehicle body frame 2 so as to be pivotable up and down. It is buffered and suspended by a suspension mechanism (not shown) provided at the base end.
[0027]
The vehicle body frame 2 has a pair of left and right main frames 2b extending in a vehicle body longitudinal direction rearward and downward from the head pipe 2a, and the main frame 2b is disposed at a lower front portion of the vehicle body frame 2. The engine 30 is suspended so that the cylinder head 31 is disposed on the lower side. The power of the engine 30 is transmitted to the rear wheel 8 by the chain 11.
[0028]
The engine 30 includes a water temperature sensor (not shown) that detects the cooling water temperature of the engine, and an electronic control device (not shown) that inputs a detection value from the water temperature sensor and controls the opening and closing of a sub-throttle valve 52 described later. The intake control device 100 is provided. The electronic control unit is configured to fully open the sub-throttle valve 52 for a certain period of time when the water temperature input when starting the engine is lower than a set value.
[0029]
An air cleaner (not shown) is disposed behind the engine 30. An exhaust pipe 13 is connected to the front portion of the engine 30 and extends downward from the lower side of the engine 30 toward the lower side 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 body width direction. The exhaust muffler 14 is connected adjacent to the rear wheel 8.
[0030]
Further, a radiator 17 is provided in front of the engine 30, and the radiator 17 is connected to a cooling water pump (not shown) provided on a side portion of the engine 30 via a cooling water hose (not shown). ing. A fuel tank 21 is installed on the upper part of the engine 30, and a seating seat 22 is detachably mounted on the rear part of the fuel tank 21. The lower part and the periphery of the rear part of the seating seat 22 are covered with a rear frame cover 23. The rear frame cover 23 is a molded product of synthetic resin.
[0031]
The engine 30 is a four-cylinder four-cycle engine, and a piston (not shown) is provided in the cylinder block 32 so as to reciprocate. The piston is connected to an output shaft of the engine 30 via a connecting rod (not shown). Is connected to a crankshaft (not shown). The reciprocating motion of the piston is converted into the rotational motion of the crankshaft by the connecting rod. A cylinder head 31 is provided at the upper end of the cylinder block 32.
[0032]
As shown in FIG. 2, an intake camshaft 41 and an exhaust camshaft 42 for opening and closing the intake valve and the exhaust valve are rotatably supported on the cylinder head 31. The intake camshaft 41 and the exhaust camshaft 42 are connected to a crankshaft (not shown) via a cam chain 43, and the rotation of the crankshaft is transmitted to the intake camshaft 41 and the exhaust camshaft 42 by the cam chain 43. It has become so.
[0033]
The cam chain 43 is disposed substantially perpendicular to each camshaft at a substantially central portion of the intake camshaft 41 and the exhaust camshaft 42, that is, a substantially center in the vehicle width direction of the engine 30.
[0034]
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 / blocked. When the exhaust camshaft 42 rotates, an exhaust valve (not shown) is driven to open and close, so that the exhaust port (not shown) and the combustion chamber are communicated / blocked.
[0035]
A suction pipe (not shown) and an exhaust manifold (not shown) are connected to the intake port and the exhaust port, respectively. The suction pipe and the intake port serve as an intake passage, and the exhaust manifold and the exhaust port serve as an exhaust passage.
As shown in FIG. 1, the intake passage is provided toward the rear of the engine 30, and a throttle body 50 is disposed upstream of the suction pipe.
The exhaust passage is provided in front of the engine 30.
[0036]
As shown in FIGS. 1 to 5, the throttle body 50 is disposed behind four cylinders arranged in parallel along the vehicle body width direction, and includes four intake passages 50 a, 50 b, 50 c, 50d in parallel, a main throttle valve 51 that opens and closes in conjunction with the operation of the throttle grip 70, a sub-throttle valve 52 that opens and closes by a motor 54 according to the operating condition of the engine 30, and an injector for injecting fuel 120 is provided, and an interlocking mechanism 60 is provided between the intake passages 50b and 50c that are disposed adjacent to the cam chain 43 and substantially at the center of the throttle body 50.
[0037]
As shown in FIG. 4, the sub-throttle valve 52 is disposed upstream of the main throttle valve 51 in the air flow direction, and the injector 120 is disposed downstream of the main throttle valve 51 in the air flow direction. ing.
[0038]
The main throttle valve 51 is integrally attached to a valve shaft 55 that is rotatably attached to the throttle body 50. As shown in FIGS. 4 and 5, a main throttle pulley 56 for operating the main throttle valve 51 is integrated with the valve shaft 55 at one end 55 a of the outer periphery of the throttle body 50 of the valve shaft 55. Is provided.
[0039]
On the outer periphery of the main throttle pulley 56, a stopper portion 56a that is positioned in contact with a valve position adjusting bolt 66 disposed in the vicinity of the main throttle pulley 56 projects outwardly from the outer periphery.
[0040]
The main throttle pulley 56 is operated via a throttle wire (not shown) that is pushed and pulled in conjunction with the operation of the throttle grip 70 operated by the driver, and opens and closes the main throttle valve 51. . By adjusting the opening of the main throttle valve 51, the amount of air taken into the combustion chamber is adjusted.
[0041]
The sub-throttle valve 52 is integrally attached to a valve shaft 58 that is rotatably attached to the throttle body 50. One end of the valve shaft 58 protrudes from the inside of the throttle body 50 to the outside, and an FID (first idle) cam 61 that rotates integrally with the valve shaft 58 is provided at the protruding end portion. The FID cam 61 is brought into contact with an interlocking mechanism 60 described later at a position where the main throttle valve 51 is almost fully opened, and the main throttle valve 51 is rotated in the opening direction. The FID cam 61 has a circular shape with a different diameter, and a cam operating portion 61a that comes into contact with a first FID link 62, which will be described later, is formed on the large diameter portion of the outer peripheral portion thereof.
[0042]
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 intake passages 50b and 50c in the central portion provided side by side.
[0043]
The interlock mechanism 60 is provided on the outer periphery of the throttle body 50 adjacent to the FID cam 61, and opens the main throttle valve 51 when the main throttle valve 51 is substantially fully closed and the sub throttle valve 52 is substantially fully open. A first FID link 62 that receives a motion of a FID (first idle) cam 61, and a second FID link 64 that receives the motion of the first FID link 62 via a coil spring 63. I have.
[0044]
The first FID link 62 is disposed close to the FID cam 61 with one end 62a as a free end, 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 that abuts against the cam operating portion 61a of the FID cam 61 protrudes from the one end portion 62a.
[0045]
The second FID link 64 has a first end portion 64a as a free end and protrudes within the swing range of the first FID link 62, and is disposed via a coil spring 63. The second end 64c is extended to a position where it abuts a part of the main throttle pulley 56 as another free end. The second end portion 64c is provided with a main throttle valve side pin body 64d that contacts a part of the main throttle pulley 56.
[0046]
Next, operations of the main throttle valve 51 and the sub throttle valve 52 of the intake control device 100 according to the present embodiment will be described with reference to the drawings.
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 a throttle body configuration diagram showing the operation of the interlocking mechanism 60 when the sub-throttle valve 52 is fully open. It is.
[0047]
First, when the engine is stopped, as shown in FIG. 4, the sub-throttle valve 52 is in a fully closed state, and the sub-throttle valve 52 is arranged substantially horizontally in the drawing. Further, the cam operating portion 61 a of the FID cam 61 is disposed at a position where it does not contact the sub throttle valve side pin body 62 c of the one end portion 62 a of the first FID link 62.
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 contact with the valve position adjusting bolt 66.
[0048]
  Next, when the engine is cold start, as shown in FIG. 5, the sub-throttle valve 52 is fully opened, and the sub-throttle valve 52 rotates approximately 90 degrees counterclockwise to be approximately parallel to the intake passage axial direction. Opened. ThatFully openDuring operation, the FID cam 61 swings approximately 90 degrees counterclockwise, the cam operating portion 61a abuts on the sub throttle valve side pin body 62c, and the cam operating portion 61a swings counterclockwise. The first FID link 62 swings clockwise.
[0049]
Here, after the coil spring 63 is compressed by a predetermined amount, the spring force wins and the second FID link 64 swings clockwise. Accordingly, the main throttle valve side pin body 64d that is in contact with the main throttle pulley 56 swings clockwise (upward in the drawing). As a result, the main throttle pulley 56 rotates counterclockwise, and accordingly, the main throttle valve 51 rotates counterclockwise in a direction that opens a minute angle.
[0050]
In this way, by fully opening the sub throttle valve 52 when the engine is cold start, the main throttle valve 51 can be opened at a predetermined minute angle (for example, approximately 1 degree) necessary for the first idle.
[0051]
After the engine is started and after idling is performed for a predetermined time, the sub-throttle valve 52 is rotated clockwise and returned to the fully closed position again. Accordingly, the first FID link 62 swings counterclockwise and the second FID link 64 is returned, so that the stopper portion 56a of the main throttle pulley 56 is returned clockwise until it comes into contact with the valve position adjusting bolt 66.
In this way, the main throttle valve 51 can be brought into a normal operation state.
[0052]
Since it is configured as described above, according to the first embodiment, the main throttle valve 51 and the sub throttle valve 52 are interlocked by the interlocking mechanism 60. The throttle valve 51 can be opened. In addition, since the plurality of throttle bodies provided below the fuel tank 21 are disposed between the intake passages adjacent to each other at the approximate center, they are not directly exposed to wind and rain, and each sliding portion can be used even for a long time. There is an advantage that the operability is not impaired.
[0053]
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 idle is performed for a certain period of time, so that the choke lever is not required and the startability of the engine is improved. Improvements can be made.
[0054]
In addition, according to the present embodiment, since the cam chain 43 is disposed in the cylinder pitch located in the center of the cylinder heads 31 arranged in parallel, the cylinders of the cylinder heads 31 arranged in parallel are employed. The throttle body 50 is disposed behind the cylinder head 31 at the center where the pitch is wider than the others, and the interlocking mechanism 60 is disposed at a position facing the cam chain of the throttle body 50, so that each cylinder has Since the corresponding intake passage shape can be made uniform over a short distance, it is possible to suppress variations in the output of each cylinder.
[0055]
Further, since 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 where the interlocking mechanism 60 is disposed, the dead space This makes it possible to lay out an air intake control device with good space efficiency.
[0056]
In the present embodiment, the FID cam 61 is brought into contact with the sub-throttle valve side pin body 62c at the position where the sub-throttle valve 52 is rotated almost fully open, so that the movement of the main throttle valve 51 is interlocked. When it is not necessary, an intake control device with good wear resistance can be realized by cutting off the contact between the FID cam 61 and the sub throttle valve side pin body 62c.
[0057]
In this embodiment, the case where a water-cooled engine is employed has been described as an example. However, an oil-cooled engine or an air-cooled engine may be used. In this case, it goes without saying that 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.
[0058]
Further, in this embodiment, a link mechanism is employed for the interlock mechanism 60 that interlocks the main throttle valve 51 and the sub throttle valve 52. However, the present invention is not limited to this, and for example, the interlock mechanism A chain may be used as a component to interlock each throttle valve, or a gear may be used to transmit the operation of each throttle valve.
[0059]
Further, in the present embodiment, the intake control device of the present invention is adopted for the parallel four-cylinder engine, but the present invention is not limited to the arrangement of the engine and the number of cylinders. It may be applied to a single cylinder engine.
[0060]
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, and FIG. 6 is an overall side view showing the configuration of an engine that employs an intake device for a fuel injection engine according to the second embodiment of the present invention. 6 is a cross-sectional view taken along the line BB in FIG. 6, FIG. 8 is a configuration diagram of the throttle body when the sub-throttle valve is fully closed, and FIG. 9 is an interlock mechanism when the sub-throttle valve is fully open. It is a throttle body block diagram which shows the structure of these. In the figure, the same reference numerals as those in the figure denote the same parts.
[0061]
As shown in FIG. 6, the second embodiment is an engine mounted on a motorcycle, and the two cylinder blocks 132a and 132b are inclined forward and backward so as to be substantially V-shaped in a side view of the vehicle. The engine 130 arranged in this manner employs an intake control device 200 for a fuel injection engine according to the present invention.
[0062]
The engine 130 includes a water temperature sensor (not shown) that detects the cooling water temperature of the engine, and an electronic control device (not shown) that inputs a detection value from the water temperature sensor and controls the opening and closing of a sub-throttle valve 152 described later. This is a fuel injection type engine provided with an intake control device 200 having the same. The electronic control unit is configured to fully open the sub-throttle valve 152 for a certain period of time when the water temperature input when starting the engine is lower than a set value.
[0063]
The engine 130 is a two-cylinder four-cycle engine, and a piston (not shown) is provided in the cylinder blocks 132a and 132b so as to be reciprocally movable. The piston is connected to the engine via a connecting rod (not shown). It is connected to a crankshaft (not shown) which is an output shaft 130. The reciprocating motion of the piston is converted into the rotational motion of the crankshaft by the connecting rod. Cylinder heads 131a and 131b are provided at the upper ends of the cylinder blocks 132a and 132b.
[0064]
An air cleaner 140 is disposed above the engine 130. A front exhaust pipe 113 is connected to the front portion of the cylinder block 132a so as to extend downward to the lower side of the cylinder block 132a toward the lower side of the cylinder block 132a. It extends toward the rear along the right side of the direction. Further, a radiator 117 is provided in front of the engine 130, and the radiator 117 is connected to a cooling water pump (not shown) provided on a side portion of the engine 130 via a cooling water hose (not shown). ing.
[0065]
As shown in FIGS. 6 to 9, the intake control device 200 includes an intake passage 210 that supplies intake air to the combustion chamber, an injector 220 that injects fuel into the intake passage 210, and an intake upstream side of the injector 220. The throttle body 150 includes a main throttle valve 151 and a sub throttle valve 152. When the main throttle valve 151 is substantially fully closed and the sub throttle valve 152 is substantially fully open, the main throttle valve 151 Is provided with an interlocking mechanism 160 that forcibly rotates the lens by a small angle in the opening direction.
[0066]
The injector 220 is disposed inside the throttle bodies 150 arranged side by side, and an upper portion thereof is connected to a delivery pipe 221 communicating with a fuel pump (not shown), and fuel is supplied from the fuel pump. .
[0067]
As shown in FIG. 6, the throttle body 150 is disposed between two banks of cylinder blocks 132 inclined forward and rearward, adjacent to each cylinder block 132, and supplies intake air to each cylinder. The intake passage 210 is integrally formed.
[0068]
As shown in FIGS. 7 and 8, the throttle body 150 receives an FID cam 161 that rotates integrally with the sub-throttle valve 152 on one side of the outer peripheral portion thereof, and the rotation of the FID cam 161. A main throttle pulley 156 that rotates the main throttle valve 151 is provided, and a sub-throttle connection bar 164 that links and interlocks the sub-throttle valves 152 is disposed.
[0069]
On the other hand, on one side of the throttle body 150, that is, on the side of the throttle body 150 opposite to the sub-throttle connection bar 164, a main throttle connection bar 165 that connects and interlocks with the main throttle valves 151 is disposed. Yes.
[0070]
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. The air flow direction of the main throttle valve 151 is An injector 220 is disposed on the downstream side.
[0071]
The main throttle valve 151 is integrally attached to a valve shaft 155 that is rotatably mounted in the vicinity of the center of the throttle body 150.
A main throttle pulley 156 for operating the main throttle valve 151 is integrally provided at one end 155a of the outer periphery of the throttle body 150 of the valve shaft 155, as shown in FIGS.
[0072]
On the outer periphery of the main throttle pulley 156, a stopper portion 156a positioned in contact with a valve position adjusting bolt 166 disposed in the vicinity of the main throttle pulley 156 is provided so as to protrude outward in the outer peripheral direction. At a position close to 152, an operation lever 156b provided with a sub-throttle valve side pin body 156c that comes into contact with the FID cam 161 protrudes outward in the outer circumferential direction.
[0073]
The sub-throttle valve 152 is integrally attached to a valve shaft 158 that is rotatably attached to the throttle body 150.
One end of the valve shaft 158 of one throttle body 150 protrudes from the inside of the throttle body 150 to the outside, and the FID cam 161 is provided to rotate integrally with the valve shaft 158 at the protruding end portion 158a. ing.
[0074]
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 of the outer peripheral portion thereof. In the moved position, the FID cam 161 is brought into contact with the sub-throttle valve side pin body 156c provided on the operation lever 156b protruding from the main throttle pulley 156 so that the main throttle valve 151 is rotated in the opening direction. ing.
[0075]
A valve driving motor 154 is connected to the other end of the valve shaft 158, that is, the end on the side opposite to the FID cam.
[0076]
As a component of the interlocking mechanism 160, a main throttle lever 162a is provided integrally with the valve shaft 155 on the valve shaft 155 to which the main throttle pulley 156 is attached on the outer peripheral portion of the throttle body 150 on the side opposite to the main throttle pulley 156. It has been.
[0077]
A main throttle lever 162b is also provided on the outer side 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 connecting bar 165 so as to interlock the opening / closing operation of the main throttle valve 151.
[0078]
A sub-throttle lever 167a is provided integrally with the valve shaft 158 at the end of the valve shaft 158 to which the FID cam 161 is attached on the outer periphery of the throttle body 150.
[0079]
A sub-throttle lever 167b is also provided on the outer side 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 / closing operation of the sub-throttle valve 152.
[0080]
Next, operations of the main throttle valve 151 and the sub throttle valve 152 of the intake control device 200 according to the second embodiment 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. 9 is a throttle body configuration diagram showing the configuration of the link mechanism when the sub-throttle valve 152 is fully open. .
[0081]
First, when the engine is stopped, as shown in FIG. 8, the sub-throttle valve 152 is fully closed, and the sub-throttle valve 152 is arranged substantially horizontally in the figure. Further, the cam operating portion 161 a of the FID cam 161 is disposed at a position where it does not contact the sub throttle valve side pin body 156 c of the main throttle pulley 156. At this time, the main throttle valve 151 is in a fully closed state, and the stopper portion 156a positions the main throttle valve 151 in a state of being in contact with the valve position adjusting bolt 166.
[0082]
Next, when the engine is cold start, as shown in FIG. 9, the sub-throttle valve 152 is fully opened, and the sub-throttle valve 152 rotates approximately 90 degrees counterclockwise to be approximately parallel to the intake passage axial direction. Opened. Accordingly, the FID cam 161 swings approximately 90 degrees counterclockwise, the cam operating portion 161a comes into contact with the sub throttle valve side pin body 156c, and the cam operating portion 161a swings counterclockwise. The throttle pulley 156 rotates clockwise. As a result, the main throttle valve 151 rotates clockwise in a direction to open a small angle.
[0083]
In this way, by fully opening the sub throttle valve 152 when the engine is cold start, the main throttle valve 151 can be opened at a predetermined minute angle (for example, approximately 1 degree) necessary for the first idle.
[0084]
Then, after idling is performed for a predetermined time after the engine is started, the sub-throttle valve 152 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.
In this way, the main throttle valve 151 can be brought into a normal operation state.
[0085]
As described above, according to the second embodiment, the intake passage including the throttle body 150 can be integrally formed by installing the intake control device 200 between the banks of the cylinders of the V-type engine. In addition, it is possible to realize a space-efficient intake control device using dead space.
[0086]
Further, the interlocking mechanism 160 includes an FID cam 161 that rotates integrally with the sub-throttle valve 152 on one side of the throttle body 150, and a main throttle pulley that rotates the main throttle valve 151 in response to the rotation of the FID cam 161. 156, and the rotation of the main throttle pulley 156 is transmitted to the main throttle lever 162b provided on the other main throttle valve 151. Therefore, the main throttle valves 151 of the throttle bodies 150 are connected to each other, The movement of the main throttle valve 151 in the FID control can be unified.
[0087]
Further, according to the present embodiment, the sub-throttle connection bar 164 is disposed on one side of the throttle body 150, and the main throttle connection bar 165 is disposed on the side of the throttle body 150 opposite to the sub-throttle connection bar 164. Therefore, the air intake control device can be configured to be evenly projected on both sides of the throttle body 150 in a well-balanced manner.
[0088]
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 idle is performed for a certain period of time, so that the choke lever is not required and the startability of the engine is improved. Improvements can be made.
[0089]
In this embodiment, the case where a water-cooled engine is employed has been described as an example. However, an oil-cooled engine or an air-cooled engine may be used. In this case, it goes without saying that 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.
[0090]
Further, in this embodiment, a link mechanism is adopted as an interlocking mechanism between the main throttle valve and the sub throttle valve. However, the present invention is not limited to this. For example, a chain is used for the interlocking mechanism. It may be one in which each throttle valve is interlocked, or one in which the operation of each throttle valve is transmitted using a gear.
[0091]
In this embodiment, the valve driving motor 154 of the sub-throttle valve 152 is disposed on the same throttle body 150 side as the main throttle pulley 156, but the present invention is limited to the motor installation position. Instead, for example, the main throttle pulley 156 may be arranged on another throttle body side.
In the present embodiment, the intake control device of the present invention is adopted for a V-type two-cylinder engine. However, the present invention is not limited to the configuration of the engine and the number of cylinders. It may be applied to the engine.
[0092]
【The invention's effect】
  As described above, claims 1 to 5 of the present invention.3According to the intake control device for a fuel injection type engine described in 1), a space-saving fuel injection type engine that can achieve both the sub-throttle valve control and the FID control in the intake control with a simple configuration and can realize the first idle automatic control. The intake control device can be realized.
  A drive motor is used as an actuator for opening and closing the sub-throttle valve, and the sub-throttle valve is set to open to a high degree of opening as the engine rotates at a high speed. It will never be fully open. If such a part is always brought into contact with another part, the wear resistance is poor. Therefore, when the sub throttle valve is in the low opening position, the cam is not brought into contact with the interlock mechanism, and when it is not necessary to synchronize the movement of the main throttle valve with the movement of the sub throttle valve, By disconnecting the contact, it is possible to realize a device configuration with good wear resistance.
[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 present embodiment.
4 is a cross-sectional view taken along the line AA in 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.
5 is a cross-sectional view taken along the line AA in FIG. 3 and is a throttle body configuration diagram showing a configuration of an interlocking mechanism when a sub-throttle valve is fully open.
FIG. 6 is an overall side view showing a configuration of an engine employing an intake device for a fuel injection type engine according to a second embodiment of the present invention.
7 is a cross-sectional view taken along the line BB in FIG. 6;
FIG. 8 is a throttle body configuration diagram showing the configuration of the interlocking mechanism when the 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 open.
[Explanation 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

Claims (3)

An intake passage for supplying intake air to a combustion chamber of an engine, an injector for injecting fuel into the intake passage, and a throttle body including a main throttle valve and a sub-throttle valve disposed on the intake upstream side of the injector A fuel injection engine,
The main throttle valve is integrally attached to a valve shaft that is rotatably attached to the throttle body and is opened and closed in conjunction with the operation of the throttle grip, while the sub-throttle valve is rotatably attached to the throttle body. In an intake control device for a fuel injection engine that is integrally attached to another valve shaft and that is opened and closed by a motor according to the operating state of the engine,
The throttle body is
A main throttle pulley is integrally provided at one end portion of the valve shaft of the main throttle valve, and a first idle cam is integrally provided at one end portion of the valve shaft of the sub throttle valve,
When the engine is cold started, the sub throttle valve is in contact with the first idle cam during the opening operation from the fully closed state to receive the operation of the first idle cam , and at least when the sub throttle valve is in the fully closed state A first link having a predetermined clearance with the first idle cam so as not to contact each other ;
A second link that receives the operation of the first link via a coil spring and transmits it to the main throttle pulley, and opens the main throttle valve by a predetermined minute opening regardless of the operation of the throttle grip ;
The first link and the second link are arranged so as to be biased toward the injector mounting side with respect to the central axis of the intake passage in the throttle body when viewed in the valve shaft direction of the main throttle valve. An intake control device for a fuel injection engine. The first link is pivotally supported on the outer periphery of the throttle body with its one end as a fulcrum,
2. The intake of the fuel injection engine according to claim 1, wherein the second link is pivotally supported on the outer periphery of the throttle body coaxially with the first link with one end thereof as a fulcrum. Control device. The fulcrum of the first link and the second link is arranged so as to be biased toward the injector mounting side with respect to the central axis of the intake passage in the throttle body when viewed in the valve shaft direction of the main throttle valve. The intake control device for a fuel injection engine according to claim 2.

Images