JP2002256895A - Throttle control device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine throttle control device which can avoid upsizing of the whole engine when arranging a drive motor. SOLUTION: This engine throttle control device has a fuel injection valve 11 and a throttle valve 7 on an intake passage 5a and is composed such that the opening degree of the throttle valve 7 is controlled by a drive motor 22 based on the operation amount of a throttle member by an artificial operation. In this case, the drive motor 22 is disposed at the same side as the fuel injection valve 11 on the intake passage 5a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle control for an engine in which a drive motor controls the opening of a throttle valve based on a throttle opening / closing input by manually operating a throttle member such as a throttle grip and an accelerator pedal. Related to the device.

[0002]

2. Description of the Related Art In recent years, there has been proposed a so-called electronic throttle control device which detects an operation amount of a throttle grip or an accelerator pedal and controls the opening of a throttle valve by a drive motor based on the operation amount. .

In disposing this type of throttle control device in an engine having a fuel injection valve for injecting fuel into an intake passage, for example, a drive motor and the like are prevented from interfering with the fuel injection valve while avoiding interference. It is desirable to arrange compactly.

[0004]

However, depending on the arrangement of the driving motor, there is a case where the above demand for compactness cannot be met. For example, if the drive motor is arranged to face the outer end of the valve shaft of the throttle valve,
Since the drive motor protrudes to the outside, there is a concern that the size of the entire engine will increase accordingly. Further, when the drive motor is mounted on an engine or a vehicle body via a stay or the like, there is a problem that the number of parts increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an engine throttle control device capable of avoiding an increase in the size of an entire engine when a drive motor is provided.

[0006]

According to a first aspect of the present invention, a fuel injection valve and a throttle valve are provided in an intake passage, and an opening degree of the throttle valve is controlled by a drive motor based on a throttle operation amount by manual operation of a throttle member. In the throttle control device for an engine to be controlled, the drive motor is disposed on the same side of the intake passage as the fuel injection valve.

According to a second aspect of the present invention, in the first aspect, the engine is a parallel multiple-cylinder engine provided with a fuel injection valve and a throttle valve for each cylinder, and the throttle valve is divided into a plurality of sets. The throttle valve opening is controlled by an independent drive motor.

According to a third aspect of the present invention, in the first or second aspect, the housing of the drive motor is integrally attached to the throttle body.

According to a fourth aspect of the present invention, in the first or second aspect, the housing of the drive motor is integrally mounted on a fuel supply pipe for supplying fuel to the fuel injection valve.

According to a fifth aspect of the present invention, in the first or second aspect, the housing of the drive motor is directly attached to the cylinder head with an elastic member interposed.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the housing of the drive motor is provided with an air passage for extracting intake negative pressure.

[0012]

According to the throttle control device of the present invention, since the drive motor is arranged on the same side of the intake passage as the fuel injection valve, it naturally occurs when the fuel injection valve is arranged in the intake passage. The drive motor can be arranged by effectively utilizing the empty space around the fuel injection valve, and the engine can be prevented from being enlarged.

According to the second aspect of the present invention, since the throttle valve is divided into a plurality of sets and controlled by independent drive motors for each set, even if one drive motor fails for some reason, the operation is performed by the remaining drive motors. Can be continued, and reliability and safety can be improved.

According to the third aspect of the present invention, the housing of the drive motor is integrally mounted on the throttle body.
The number of parts can be reduced to the extent that stays and the like can be eliminated, and the drive motor can be assembled to the throttle body in advance so as to be easily assembled to the engine.

According to the fourth aspect of the present invention, since the housing of the drive motor is integrally mounted on the fuel supply pipe, the number of parts can be reduced as in the third aspect, and
Improves ease of assembly to the engine.

According to the fifth aspect of the present invention, since the housing of the drive motor is directly mounted on the cylinder head via the elastic member, the mounting strength can be increased while avoiding the influence of engine vibration on the drive motor.

According to the sixth aspect of the present invention, since the air passage for taking out the intake negative pressure is formed in the housing of the drive motor, a conventional dedicated air hose can be dispensed with and the area around the engine can be simplified.

[0018]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 5 are views for explaining an engine throttle control apparatus according to an embodiment (first embodiment) of the first and third aspects of the present invention. 4 is a partial cross-sectional side view, plan view, and rear view of an engine provided with a throttle control device, FIG. 4 is a diagram showing a connection portion between a drive motor and a valve shaft, and FIG. 5 is a diagram showing a reduction gear mechanism of the drive motor. It is a side view.

In FIG. 1, reference numeral 1 denotes a water-cooled four-cycle parallel four-cylinder engine employed in a motorcycle. In the engine 1, each cylinder axis A is vertically oriented, and a crankshaft (not shown) has a vehicle width. It is mounted on a body frame (not shown) in the direction.

In the engine 1, a cylinder head 3 is bolted to an upper surface of a cylinder block 2 in which four cylinders 2a are arranged in parallel in the vehicle width direction, and a head cover 4 is mounted on the upper surface of the cylinder head 3. And a schematic structure in which a crankcase (not shown) is connected to the lower mating surface of the cylinder block 2.

An intake valve opening 3a and an exhaust valve opening 3b are opened in a recess forming the combustion chamber of the cylinder head 3, and these valve openings 3a and 3b are opened and closed by intake and exhaust valves (not shown). You. An exhaust port 3c connected to the exhaust valve opening 3b is led out to the front wall of the cylinder head 3, and an exhaust pipe (not shown) is connected to each exhaust port 3c. An intake port 3d connected to the intake valve opening 3a extends to the rear wall of the cylinder head 3, and a throttle body 5 is connected to each intake port 3d.

Each of the throttle bodies 5 is disposed so as to be substantially horizontal, and an intake duct 6a is connected to an air intake port, which is an upstream end of the throttle body 5, and the intake duct 6a is common. The air cleaner 6 is inserted into the air cleaner 6 and is opened at the middle of the air cleaner 6. In addition, 6b is an air cleaner element.

A butterfly type throttle valve 7 is arranged in the intake passage 5a of each of the throttle bodies 5 so as to be opened and closed between a fully closed position and a fully opened position. The throttle valves 7 are connected to each other by a common valve shaft 8, and a return spring 9 for urging the throttle valve 7 to the fully closed position is provided on the valve shaft 8. At the right end of the valve shaft 8, a throttle opening sensor 10 is mounted.

A fuel injection valve 11 is mounted on the upper wall 5b of each throttle body 5. A valve hole 5c is formed in the upper wall 5b on the downstream side of the throttle valve 7.
The nozzle of the fuel injection valve 11 is inserted into each of the valve holes 5c. The fuel injection valves 11 are arranged obliquely rearward and upward, and the fuel from each fuel injection valve 11 is injected toward the back surface of the head of the intake valve through the intake port 3d.

A common fuel supply unit 15 is connected to each of the fuel injection valves 11. This fuel supply unit 15 is disposed above the throttle body 5,
Fuel supply pipe 1 arranged to extend in the vehicle width direction in plan view
The left end of a fuel supply hose 17 arranged to extend in parallel with the left end of the fuel supply hose 6 is connected to a joint pipe 18.

The upper end of each fuel injection valve 11 is inserted and connected to a connection port 16a branched from the fuel supply pipe 16. A fuel pump (not shown) is connected to an upstream end of the fuel supply hose 17. A regulator 20 for adjusting the fuel pressure is connected to the downstream end of the fuel supply pipe 16, and the regulator 20 is connected to a fuel tank (not shown) via a return pipe. Reference numeral 21 denotes a negative pressure hose for introducing the intake negative pressure to the regulator 20, and the regulator 20 variably adjusts the fuel pressure to the fuel injection valve 11 according to the intake negative pressure. Reference numeral 19 denotes a harness for supplying power to each fuel injection valve 11. The harness 19 is routed along the fuel supply pipe 16.

Each of the throttle valves 7 and a throttle grip (not shown) are connected via a throttle control device. The throttle control device includes a throttle operation detection sensor (not shown) for detecting an operation amount (rotation amount) of a throttle grip by a driver, a drive motor 22 for opening and closing each of the throttle valves 7, and a throttle operation detection sensor. And a controller (not shown) for controlling the drive of the drive motor 22 based on the detected value from the controller.

The drive motor 22 is housed in an aluminum die-cast housing 23. The housing 23 has a gear case 26 in which a reduction gear mechanism 25 is housed.
Are integrally formed. The gear case 26 is provided so as to be located between the two throttle bodies 5 and 5 at the center in the vehicle width direction.

The drive motor 22 has its rotary shaft 22a oriented parallel to the valve shaft 8, and is arranged on the same side of the throttle body 5 as the fuel injection valve 11. More specifically, the drive motor 22 is fixedly attached to the housing 23 by bridging the housing 23 between the front walls of the upper walls 5b of the two right throttle bodies 5 and 5 from the fuel injection valve 11.

The drive motor 22 is disposed so as to be exposed upward between the fuel supply pipe 16 and the engine 1 in plan view. Thus, the drive motor 22 can be maintained from above the engine by removing the fuel tank.

As shown in FIG. 5, the reduction gear mechanism 25 includes a throttle gear 27 mounted on the valve shaft 8, a rotary gear 28 mounted on the rotary shaft 22 a of the drive motor 22, and both gears 27. , 28 and an intermediate gear train 29 meshed with the gear train. The intermediate gear train 29 is provided with the rotary gear 28.
A large reduction gear 29a meshing with the throttle gear 2
The gear shaft 29 c of the intermediate gear train 29 is supported by the gear case 26.

As shown in FIG. 4, a connecting shaft 27 projecting outward from the gear case 26 is provided on the throttle gear 27.
a is inserted and fixed, and the left and right valve shafts 8a and 8b are connected to the connecting shaft 27a. The left and right valve shafts 8a,
8b is formed with a groove extending in the axial direction, and both ends of the connection shaft 27a are formed with protrusions that engage with the groove, whereby both valve shafts 8a and 8b are connected to the connection shaft 27a. It is designed to rotate integrally through the.

Next, the operation and effect of this embodiment will be described.

When the driver turns the throttle grip, the drive motor 22 rotates in accordance with the amount of the operation, and this rotation is transmitted to the valve shaft 8 via the reduction gear mechanism 25.
Each throttle valve 7 rotates with the rotation of the valve shaft 8.

According to the throttle control device of the present embodiment, since the drive motor 22 is disposed on the same side of the throttle body 5 as the fuel injection valve 11, the fuel injection valve 11 and the engine can be connected without interfering with the fuel injection valve 11. 1 can be effectively used, an increase in the size of the engine can be avoided, and the demand for compactness can be met. When the maintenance of the drive motor 22 is performed, the maintenance can be easily performed from above the engine by removing the fuel tank, and the workability can be improved.

In the present embodiment, the drive motor 22 is mounted and fixed over the two right throttle bodies 5, 5, so that the mounting strength of the drive motor 22 can be secured and the connection strength between the throttle bodies 5 can be reduced. Can be enhanced.

The drive motor 22 is connected to the throttle body 5
, The number of parts can be reduced as compared with the case where the fixing is performed via another member such as a stay. Further, by assembling the drive motor 22 integrally with each throttle body 5 in advance, the assemblability to the engine can be improved.

Further, since all the throttle valves 7 are rotationally driven by one drive motor 22, the structure can be simplified and the increase in cost can be suppressed.

In the above embodiment, each fuel injection valve 1
1 has been described on the upper wall 5b of the throttle body 5, but in the present invention, the fuel injection valve may be disposed on the lower wall of the throttle body. Is disposed on the side of the fuel injection valve.

In the above embodiment, the drive motor 22
Has been described by way of example, in which the rotation is transmitted to the valve shaft 8 via the reduction gear mechanism 25. However, the present invention is not limited to this. For example, a link mechanism, a wire mechanism, or a combination thereof is used. Is also good.

For example, FIG. 6 shows a modification of the speed reduction mechanism of the drive motor. In FIG. 6, the same reference numerals as those in FIG. 5 denote the same or corresponding parts. In this modification, a rotating gear 28 of the drive motor 22 is used.
And a gear shaft 29c of the large reduction gear 29a and the valve shaft 8 are connected via a link mechanism 30. The link mechanism 30 has a structure in which a drive link member 31 fixed to a gear shaft 29c and a driven link member 32 fixed to a valve shaft 8 are rotatably connected by an arm member 33. The same effect as the above embodiment can be obtained.

FIG. 7 is a view for explaining a throttle control device according to a second embodiment of the first and third aspects of the present invention. In the drawings, the same reference numerals as those in FIGS. 2 and 3 indicate the same or corresponding parts, and a description of the same reference numerals will be omitted.

In the throttle control device according to the present embodiment, the drive motor 22 is arranged on the same side of the throttle body 5 as the fuel injection valve 11, and the rotation shaft 2 of the drive motor 22
2a is arranged so as to face in a direction perpendicular to the valve shaft 8. A worm gear 35 is mounted on the rotating shaft 22a, and the worm gear 35 meshes with a worm wheel 36 fixedly mounted on the valve shaft 8.

In the present embodiment, the drive motor 22 is arranged on the same side of the throttle body 5 as the fuel injection valve 11, and the drive motor 22 is arranged so that the rotation shaft 22a faces in a direction perpendicular to the valve shaft 8. The fuel injection valve 11 is fixed to the two throttle bodies 5 and 5 at the center.
The arrangement can be performed by effectively utilizing the empty space without interfering with the configuration, and the same effect as in the first embodiment can be obtained.

FIG. 8 is a diagram for explaining a throttle control device according to one embodiment (third embodiment) of the first and fourth aspects of the present invention.

The throttle control device of this embodiment is a case where the throttle control device is provided in an engine 40 in which the cylinder axis A is inclined obliquely forward and upward. The throttle body 5 is connected to each intake port 41a of the cylinder head 41 of the engine 40 in a vertically upward direction.
A fuel injection valve 11 is mounted on a portion of the rear wall 5d downstream of the throttle valve 7.

A drive motor 22 is provided on the same side of each throttle body 5 as the fuel injection valve 11. The drive motor 22 is attached to a fuel supply pipe 42 for supplying fuel to the fuel injection valve 11. Fixed.

According to the present embodiment, in the forward leaning engine 40, the drive motor 22 is disposed on the fuel injection valve 11 side of the throttle body 5 and is fixed to the fuel supply pipe 42, so that the throttle body 5 and the fuel injection Valve 11
In addition, the arrangement can be effectively utilized by utilizing the empty space between them, and the engine can be prevented from being enlarged, and maintenance can be easily performed, and the same effects as those of the first embodiment can be obtained.

FIGS. 9 to 11 are views for explaining a throttle control device according to an embodiment (fourth embodiment) of the second, third, and sixth aspects of the present invention. In the drawings, the same reference numerals as those in FIGS. 1 to 3 indicate the same or corresponding parts.

In the throttle control device of the present embodiment, two drive motors 45, 45 'are disposed on the same side of the throttle body 5 as the fuel injection valve 11, and the left drive motor 45 controls the valve shaft 8a of the left cylinder. To the right drive motor 45 '.
To independently drive the valve shaft 8b of the right cylinder. The drive motors 45 and 45 'are housed in a housing 47 in which a gear case 46 is integrally connected and formed, and the basic structure is the same as that of the first embodiment.

The drive motors 45 and 45 'are mounted and fixed on the left and right throttle bodies 5 and 5, respectively. The left gear case 46 is connected to the left valve shaft 8a.
The right gear case 46 is connected to the inner end of the right valve shaft 8b.

An air passage (not shown) for taking out the intake negative pressure downstream of the throttle valve 7 is formed on the joint surface between the drive motors 45, 45 'and the throttle body 5. Thus, the drive motors 45, 4
Since the air passage is formed by using the attachment surface between the 5 'and the throttle body 5, a dedicated air hose can be eliminated, and the area around the engine can be simplified.

According to this embodiment, the two drive motors 4
5, 45 ', the respective valve shafts 8a, 8b are independently driven to rotate, so that if one of the drive motors fails for some reason, the operation can be continued by the other drive motor. And safety can be improved.

Further, since the drive motors 45 and 45 'are fixed by bridging the two throttle bodies 5 and 5, the number of parts can be reduced as compared with the case where the drive motors 45 and 45' are fixed via separate members such as stays. An effect can be obtained as in the embodiment.

In each of the above embodiments, the case where the drive motor is mounted and fixed to the throttle body or the fuel supply pipe has been described. However, in the present invention, the drive motor is directly mounted and fixed to the cylinder head via an elastic member. This is the invention of claim 5. In this case, the mounting strength of the drive motor can be increased,
Further, since the engine vibration is absorbed by the elastic member, the influence of the engine vibration on the drive motor can be suppressed.

[Brief description of the drawings]

FIG. 1 is a partially sectional side view for explaining an engine throttle control device according to a first embodiment of the present invention.

FIG. 2 is a plan view of an engine provided with the throttle control device.

FIG. 3 is a rear view of the engine.

FIG. 4 is a view showing a connection portion between a drive motor and a valve shaft of the throttle control device.

FIG. 5 is a side view of a reduction gear mechanism of the drive motor.

FIG. 6 is a diagram showing a reduction mechanism of a drive motor according to a modification of the embodiment.

FIG. 7 is a plan view for explaining a throttle control device according to a second embodiment of the present invention.

FIG. 8 is a schematic side view for explaining a throttle control device according to a third embodiment of the present invention.

FIG. 9 is a partial sectional side view for illustrating an engine throttle control device according to a fourth embodiment of the present invention.

FIG. 10 is a plan view of an engine provided with the throttle control device.

FIG. 11 is a rear view of the engine.

[Explanation of symbols]

 1,40 engine 3,41 cylinder head 5a intake passage 5 throttle body 7 throttle valve 8,8a, 8b, 27a valve shaft 11 fuel injection valve 16,42 fuel supply pipe 22,45 drive motor 23,47 hashing

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Sadahisa Suzuki 2500 Shinkai, Iwata City, Shizuoka Prefecture Yamaha Motor Co., Ltd. (72) Inventor Haruhiko Samoto 2500 Shinkai, Iwata City, Shizuoka Prefecture Yamaha Motor Co., Ltd. 72) Inventor Ichisuke Uehira 2500 Shinkai, Iwata City, Shizuoka Prefecture Yamaha Motor Co., Ltd. F-term (reference) 3G065 AA04 AA07 BA01 CA14 CA23 CA34 DA04 HA03 KA03 KA33

Claims (6)

[Claims] 1. An engine throttle control device comprising a fuel injection valve and a throttle valve in an intake passage, wherein an opening degree of the throttle valve is controlled by a drive motor based on a throttle operation amount by a manual operation of a throttle member. An engine throttle control device, wherein the drive motor is disposed on the same side of the intake passage as the fuel injection valve. 2. The drive motor according to claim 1, wherein the engine is a parallel multiple-cylinder engine having a fuel injection valve and a throttle valve for each cylinder, wherein the throttle valve is divided into a plurality of sets, and an independent drive motor is provided for each set. A throttle control device for an engine, wherein a throttle valve opening is controlled by the throttle valve. 3. The throttle control device for an engine according to claim 1, wherein the housing of the drive motor is integrally mounted on a throttle body. 4. The throttle control device for an engine according to claim 1, wherein a housing of the drive motor is integrally attached to a fuel supply pipe for supplying fuel to the fuel injection valve. 5. The throttle control device for an engine according to claim 1, wherein the housing of the drive motor is directly attached to the cylinder head via an elastic member. 6. The throttle control device for an engine according to claim 1, wherein an air passage for extracting intake negative pressure is formed in the housing of the drive motor.