JP4349987B2 - Intake air amount control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake air-flow controller which is simplified, miniaturized, and modularized. <P>SOLUTION: The intake air-flow controller includes a bypass bypassing a throttle valve 2, an idle-adjustment mechanism, a bypass intake-air flow adjustment mechanism, a cylindrical passage 303, and a bypass intake-air flow adjustment valve 304. The cylindrical passage 303 divides the bypass into an upstream bypass 301 and a downstream bypass 302. The adjustment valve 304 is capable of opening/closing the downstream bypass by sliding in the cylindrical passage 303 with the upstream bypass opened all the time. The idle-adjustment mechanism is composed of a connecting passage 305 which is opened to the cylindrical passage to allow the upstream bypass to communicate with the downstream bypass, and an idle adjustment valve 306 capable of regulating the area of the communicating passage 305. Thus, even though a set intake-air flow is changed, set temperature is unchanged, and a simplified and miniaturized device can be obtained. <P>COPYRIGHT: (C)2005,JPO&amp;NCIPI

Description

  The present invention relates to an intake air amount control device that controls an intake air amount that flows through a bypass passage that bypasses (bypasses) a throttle valve that opens and closes an intake passage of an internal combustion engine (hereinafter referred to as an engine). An idle adjustment mechanism that adjusts the idle intake air amount when the engine is in the engine, and a first idle adjustment mechanism that adjusts (controls) the fast idle intake amount when the engine is in a cold operation state, and is an engine such as a two-wheeled vehicle or a four-wheeled vehicle The present invention relates to an intake air amount control device applied to the above.

As a conventional intake air amount control device, as shown in FIG. 10 (a), two bypass passages 3 and 4 are provided on the same side so as to bypass the throttle valve 2 for opening and closing the intake passage 1, and one bypass passage is provided. The passage 3 is provided with an idle adjustment screw 3a (idle adjustment mechanism) for adjusting the idle intake amount, and the other bypass passage 4 is a wax-type fast idle for adjusting the first idle intake amount during cold operation. A valve provided with an adjustment valve 4a (first idle adjustment mechanism) is known.
In this apparatus, the amount of idle adjustment screw 3a is adjusted to adjust the intake air amount when the engine is in a normal idle operation state, and the first idle is made using the expansion and contraction of wax caused by the cooling water temperature of the engine. By operating the adjustment valve 4a, the intake air amount when the engine is in the cold operation state is adjusted (see, for example, Patent Document 1).

As another intake air amount control device, as shown in FIG. 10B, bypass passages 3 'and 4 are provided on both sides of the intake passage 1 so as to bypass the throttle valve 2 that opens and closes the intake passage 1, respectively. ′, One bypass passage 3 ′ is provided with an idle adjustment screw (idle adjustment mechanism) 3 a ′ for adjusting the idle intake amount, and the other bypass passage 4 ′ is a first idle intake amount during cold operation. It is known to provide a wax-type first idle adjustment valve 4a '(first idle adjustment mechanism) for adjusting the pressure.
In this device, as in the above-described device, the amount of idle adjustment screw 3a 'is adjusted to adjust the intake air amount when the engine is in a normal idle operation state, and the amount of wax generated by the cooling water temperature of the engine is adjusted. By operating the first idle adjustment valve 4a using expansion and contraction, the intake air amount when the engine is in a cold operation state is adjusted (see, for example, Patent Document 2).

Furthermore, as another intake air amount control device, as shown in FIG. 11, a bypass passage 5 that bypasses the throttle valve 2 that opens and closes the intake passage 1 is provided. An idle adjustment screw that adjusts the idle intake amount by providing a wax-type fast idle adjustment valve 6 (first idle adjustment mechanism) for adjusting the amount, and further arranged to engage the tip of the first idle adjustment valve 6 7 (idle adjustment mechanism) is known.
In this device, by adjusting the screwing amount of the idle adjusting screw 7 and changing the protruding amount of the first idle adjusting valve 6, the intake air amount when the engine is in a normal idle operation state is adjusted, and the engine cooling is performed. By operating the first idle adjustment valve 6 using the expansion and contraction of the wax due to the water temperature, the intake air amount when the engine is in the cold operation state is adjusted (see, for example, Patent Document 3).
No. 7-38696 Japanese Patent No. 2730120 JP 2002-54537 A

  By the way, in the conventional intake air amount control device shown in FIGS. 10A and 10B, two bypass passages 3 and 4 (3 ′, 4 ′) are substantially provided, and the respective bypass passages are provided. Since the idle adjustment screws 3a and 3a ′ for adjusting the intake air amount and the first idle adjustment valves 4a and 4a ′ are provided, the passage members forming the respective bypass passages 3 and 4 (3 ′ and 4 ′) are provided. There is a problem that the structure becomes complicated and the size of the apparatus is increased. Further, in these devices, there is no description about the structure and method for setting the initial values of the first idle adjustment valves 4a and 4a ′.

  On the other hand, in the conventional intake control device shown in FIG. 11, although the structure is simplified with only one bypass passage 5, the screwing amount of the idle adjustment screw 7 is adjusted, as shown in FIG. 12 (a). When the intake air amount Qi in the normal idle operation state is adjusted (± ΔQ), the set temperature when the first idle adjustment valve 6 is fully closed changes (ΔT), while FIG. As described above, even if the intake amount Qf when the first idle adjustment valve 6 is fully opened is adjusted (± ΔQ), the set temperature when the first idle adjustment valve 6 is fully closed changes (ΔT). there were. Further, the initial value of the first idle adjustment valve 6 needs to be set at the time of assembling. If it is desired to adjust again after the assembling, the apparatus must be disassembled, and the readjustment cannot be easily performed. there were.

  The present invention has been made in view of the circumstances of the above-described conventional apparatus. The object of the present invention is to intake air without changing the set temperature while simplifying the structure and downsizing the apparatus. The amount of initial setting can be easily changed, and the intake amount such as first idle can be easily adjusted even after assembly, and the versatile intake amount that can be mounted on various engines It is to provide a control device.

An intake air amount control device of the present invention includes a bypass passage that bypasses a throttle valve that opens and closes an intake passage of an engine,
A bypass intake air amount adjusting mechanism for adjusting an intake air amount flowing through the bypass passage;
An idle adjustment mechanism that adjusts the intake air amount during idle operation;
An intake air amount control device comprising:
The bypass intake air amount adjusting mechanism is
A cylindrical passage interposed so as to divide the bypass passage into an upstream bypass passage and a downstream bypass passage;
An opening of the downstream bypass passage that opens into the cylindrical passage;
A bypass intake air amount adjusting valve that can open and close an opening of the downstream bypass passage in a state in which the upstream bypass passage is always released by sliding in the cylindrical passage,
The idle adjustment mechanism includes:
A second cylindrical passage through which an idle adjustment valve capable of adjusting the passage area slides;
An upstream connecting passage that opens into the tubular passage and communicates the tubular passage and the second tubular passage;
A downstream connecting passage that communicates the second cylindrical passage and the downstream bypass passage;
A second connecting passage that opens to the cylindrical passage and communicates the upstream bypass passage and the downstream bypass passage is further provided .

  According to this configuration, it is possible to control the intake air amount that flows from the upstream bypass passage to the downstream bypass passage by operating the bypass intake air amount adjustment valve in accordance with the operating state of the engine. It is possible to adjust the intake air amount (idle intake air amount) flowing from the upstream bypass passage and the cylindrical passage to the downstream bypass passage through the connection passage.

Further , according to the above configuration, the amount of idle intake air flowing from the upstream bypass passage → the tubular passage → the upstream connection passage → the second tubular passage → the downstream connection passage → the downstream bypass passage is the second tubular passage. It adjusts by adjusting the idle adjustment valve arrange | positioned in (3) suitably. Thus, by interposing the second cylindrical passage, the connection passage can be easily laid out (for example, bent), and the degree of freedom in layout is increased.
The said structure WHEREIN: The structure by which the adjustment mechanism which adjusts the channel area of a 2nd connection path is provided in the said 2nd connection path is employable.

In the above configuration, the engine has a plurality of cylinders and an intake passage, and a plurality of the downstream bypass passage , the downstream connection passage, and the second connection passage are formed so as to correspond to the plurality of intake passages. It is,
In the plurality of second connection passages that open to the cylindrical passage,
A configuration in which a plurality of adjustment mechanisms for adjusting the passage area of the second connection passage is provided can be employed.
According to this configuration, in a multi-cylinder engine, only one device needs to be used, so the number of parts provided in the intake system of the engine is reduced and simplified.
Also, by finely adjusting the amount of intake air flowing through each second connecting passage by appropriately adjusting a plurality of adjustment mechanisms (for example, bypass adjustment screw, etc.), the amount of intake air flowing into each cylinder (intake passage) is finely adjusted. can do.

In the above configuration, the bypass intake air amount adjusting valve includes a piston valve body that slides in the cylindrical passage, an actuator that drives the piston valve body, and the piston valve body with respect to the opening of the downstream bypass passage. An adjustment unit capable of adjusting the initial position,
The idle adjustment valve may be configured to manually slide in the second cylindrical passage and adjust the passage area of the connection passage.
According to this configuration, the piston valve body slides in the cylindrical passage by the drive of an actuator (for example, wax that expands and contracts depending on the temperature of engine cooling water, a motor driven by a specific drive source, etc.). Thus, by opening and closing the opening of the downstream bypass passage, the amount of intake air flowing through the bypass is adjusted, and by appropriately adjusting the adjusting portion, the initial position of the piston valve body with respect to the opening is set. .

In the above-described configuration, the tubular body, the upstream bypass passage, the downstream bypass passage, the connection passage, and a passage body that defines the second connection passage ,
The passage body includes an upstream connector that can connect the upstream bypass passage to the intake passage upstream of the throttle valve, and a downstream connector that can connect the downstream bypass passage to the intake passage downstream of the throttle valve; It is possible to adopt a configuration having
According to this configuration, since this intake air amount control device can be modularized, it can be retrofitted to a throttle body or the like that forms the intake passage of the engine, and can be applied to various throttle bodies, The throttle body can be simplified as compared with the case where this device is formed integrally with the throttle body.

In the above configuration, the idle adjustment valve includes the second piston valve body that slides in the second cylindrical passage, the spring that biases the second piston valve body in one direction, and the second piston from the side that antagonizes the spring. It is possible to adopt a configuration including an adjustment screw that is in contact with the valve body and screwed into the passage body.
According to this structure, since the idle adjustment valve is comprised by the component which the 2nd piston valve body, the spring, and the adjustment screw were divided | segmented, it is suitable when it is difficult to form integrally.

The said structure WHEREIN: The structure by which the cover member which covers an adjustment part is detachably attached to a passage body is employable.
According to this configuration, by removing the cover member, it is possible to easily adjust the bypass intake air amount adjustment valve (stop position with respect to the opening of the piston valve body) even after assembly. Becomes easier.

The said structure WHEREIN: The structure currently formed so that a cylindrical channel | path and a 2nd cylindrical channel | path extend in the same direction is employable.
According to this configuration, the bypass intake air amount adjustment valve and the idle adjustment valve are arranged so as to extend in the same direction, and the entire apparatus can be integrated and downsized.

In the above configuration, the downstream bypass passage may have a plurality of openings formed so as to be biased in the moving direction of the piston valve body with respect to the side surface of the cylindrical passage.
According to this configuration, the relationship between the position of the bypass intake air amount adjusting valve (piston valve body) and the bypass intake air amount can be made into a linear proportional relationship, which facilitates the setting of characteristics. That is, when the downstream bypass passage is formed by drilling or the like with respect to the passage body or the like, two or more small-diameter holes biased in the moving direction of the piston valve body rather than making one large-diameter hole. By opening the opening made of the above, it is possible to obtain a linear characteristic in the relationship between the first idle intake amount and the adjustment amount while facilitating the processing.

According to the intake air amount control device of the present invention having the above-described configuration, for example, the initial setting value of the first idle intake air amount is changed by a first idle adjustment mechanism that controls (adjusts) the intake air amount when the engine is in a cold operation state, Even if the initial setting value of the idle intake air amount is changed by the idle adjustment mechanism that adjusts the intake air amount in the normal idle operation state, each is not affected (for example, the set temperature does not change). A desired intake air amount can be set.
In addition, by dividing the one bypass passage into two parts and providing a cylindrical passage used for adjusting the intake air amount in the bypass, and connecting the connecting passage used for adjusting the idle intake air amount to the side surface of this cylindrical passage, The entire passage structure is simplified, and the entire apparatus can be simplified and reduced in size.
In particular, this apparatus can be modularized by integrally forming a bypass passage, a connecting passage, a cylindrical passage, and the like with respect to the passage body. Therefore, it can be applied to various engines (throttle bodies that form the intake passage) by retrofitting, and can be bypassed for all cylinders by adopting only this device for multi-cylinder engines. The amount of intake air can be controlled.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1 to 8 show an embodiment of an intake air amount control apparatus according to the present invention, that is, a form in which a bypass intake air amount adjusting mechanism is applied to a first idle adjusting mechanism that adjusts an intake air amount during fast idle operation. 1 is a system diagram including this apparatus, FIGS. 2 to 7 are a sectional view and a side view showing the apparatus, and FIG. 8 is a characteristic diagram.

  In this system, as shown in FIG. 1, an intake pipe (and a throttle body) 1 ′ defining two intake passages 1 for guiding air to a combustion chamber of an engine E having two cylinders S, and an operating state of the engine E And two throttle valves 2 for opening and closing the respective intake passages 1, two injectors 8 for injecting fuel by electronic control, and a surge tank 9 for joining the two intake passages 1 to form part of the intake passages, An upstream bypass pipe 10 that communicates with an intake passage (surge tank 9) upstream of the throttle valve 2 to define a part of the upstream bypass passage, and communicates with an intake passage downstream of the throttle valve 2 and downstream Two downstream bypass pipes 11 and 12 defining a part of the side bypass passage, and a bypass intake air amount control system interposed between the upstream bypass pipe 10 and the downstream bypass pipes 11 and 12 Apparatus M, is formed by the water pipes 13, 14 and the like for circulating cooling water of the engine E to the apparatus M. The device M is detachably connected to an upstream bypass pipe 10, downstream bypass pipes 11, 12, water pipes 13, 14, and a throttle body that defines a part of the intake pipe 1 '. Yes.

As shown in FIGS. 2 to 7, the device M includes a passage body 100 elongated in one direction, a first idle adjustment valve (bypass intake air amount adjustment valve) 130 provided on the passage body 100, an idle adjustment valve 150, a passage body. A cover member 170 and a connector cover 190 which are detachably attached to 100, and two bypass adjustment screws 200 and 201 as an adjustment mechanism for adjusting the intake air amount between cylinders are formed.
As shown in FIGS. 2 to 7, the passage body 100 includes a tubular passage 101 that is long in the extending direction, an upstream connector 102 that opens at a side surface of the tubular passage 101 and defines an upstream bypass passage 102a, and a tubular shape. Two downstream bypass passages 103 and 104 having openings 103 a and 104 a on one side surface 105 of the passage body 100 that are open on the other side surface of the passage 101, and a second tubular shape formed in parallel with the tubular passage 101. A passage 106, an upstream connecting passage 107 that communicates the tubular passage 101 and the second tubular passage 106, two downstream connecting passages 108 that communicate the second tubular passage 106 and the downstream bypass passages 103 and 104, 109, two second connecting passages 110, which open on the side surface of the cylindrical passage 101 and communicate with the upstream bypass passage 102a and the downstream bypass passages 103, 104, respectively. Defining a 11, and the like.

As shown in FIGS. 2 to 7, the cylindrical passage 101 is interposed so as to divide one bypass passage into an upstream bypass passage 102 a and downstream bypass passages 103, 104, and both passages 102 a, 103 and 104 are communicated.
As shown in FIGS. 2 to 7, the second cylindrical passage 106 has two upstream connection passages 108, 109 communicating with the upstream connection passage 107 communicating with the tubular passage 101 and the downstream bypass passages 103, 104. And the passages 107, 108, 109 are formed to communicate with each other on the side surface. That is, the upstream side connecting passage 107, the second cylindrical passage 106, and the two downstream side connecting passages 108 and 109 are opened to the side surface of the cylindrical passage 101 so that the upstream side bypass passage 102a and the downstream side bypass passages 103 and 104 A connecting passage is formed for communicating the.
Further, since the cylindrical passage 101 and the second cylindrical passage 106 are formed to extend in the same direction, the first idle adjustment valve 130 and the idle adjustment valve 150 are arranged to extend in the same direction. Thus, the entire apparatus can be integrated and downsized.

As shown in FIGS. 4 and 5, the downstream bypass passages 103 and 104 have two openings 103 b and 104 b, respectively, at positions displaced in the extension direction with respect to the side surface of the cylindrical passage 101. It is formed to have.
In this way, by forming the two openings 103b in a biased manner and by forming the two openings 104b in a biased manner, the position of the first idle adjusting valve 130 (piston valve body 131 to be described later) and the first idle intake air amount. Can be set to a linear proportional relationship, so that the characteristics can be easily set. That is, when a plurality of (two in this case) downstream bypass passages 103 and 104 are formed on the passage body 100 by drilling or the like, an opening made up of a plurality of small diameter holes rather than a single large diameter hole. By opening the portions 103b and 104b, it is possible to obtain a linear characteristic in the relationship between the first idle intake amount and the adjustment amount while facilitating the processing.

As shown in FIG. 6A and FIG. 7A, the two second connecting passages 110 and 111 are opened in the side surface of the cylindrical passage 101, and are connected to the upstream bypass passage 102a and the two downstream bypass passages. 103 and 104 are bent so as to communicate with each other.
The bypass adjustment screws 200 and 201 are screwed into the bent regions of the second connection passages 110 and 111. Since the bypass adjustment screws 200 and 201 are formed in a conical shape with a tapered tip, the passage areas of the second connection passages 110 and 111 can be adjusted by appropriately adjusting the screwing amounts thereof. Yes.
That is, by appropriately adjusting the bypass adjustment screws 200 and 201, the amount of intake air flowing through each cylinder can be finely adjusted.
Further, by providing the bypass adjustment screws 200 and 201 and the second connection passages 110 and 111 integrally with the passage body 100 in this way, the flow rate is previously set in the assembly line of the device M before being installed in the engine E. Adjustment can be performed, and the throttle body and the like that form the intake passage can be simplified.

  As shown in FIGS. 2 to 7, the connector cover 190 is connected to one side surface 105 of the passage body 100 to cover the openings 103a and 104a, and the downstream bypass passages 103 and 104 are respectively connected to the downstream bypass pipe 11, 12 have two downstream connectors 191 and 192 connected thereto. Here, the two downstream bypass passages 103 and 104 can be easily separated by appropriately setting a seal member interposed between the one side surface 105 and the connector cover 190. That is, for a single-cylinder engine, the seal member and this connector cover are formed so that the two downstream bypass passages 103 and 104 communicate with each other and have one downstream connector. Can be easily applied. As described above, the device can be applied to various throttle bodies that form the intake passage by appropriately changing the connector cover.

When the engine E is in a cold operation state, the first idle adjustment valve 130 fully opens the openings 103b and 104b of the downstream bypass passages 103 and 104 to increase the amount of first idle intake, while the engine E exceeds the predetermined temperature or In a normal idle operation state in a warm-up state, the bypass intake air amount is controlled so that the openings 103b and 104b are fully closed and only the idle intake air amount flows.
2 and 3, the first idle adjusting valve 130 includes a piston valve body 131 that slides in the cylindrical passage 101, a rod 132, a movable body 132a that moves integrally with the rod 132, a spring 133, 134, a wax 135 that expands and contracts depending on temperature, connectors 136 and 137 for circulating the cooling water of the engine E to the wax 135, a nut 138 as an adjustment unit that adjusts an initial position of the piston valve body 131, and the like. .

Here, when the wax 135 contracts, the rod 132 (and the movable body 132a) moves rightward in FIG. 2, and the piston valve body 131 fully opens the openings 103b and 104b. On the other hand, when the wax 135 expands, The rod 132 (and the movable body 132a) moves leftward in FIG. 2, and the piston valve body 131 fully closes the openings 103b and 104b. Note that, regardless of the movement of the piston valve body 131, the upstream bypass passage 102a and the upstream connection passage 107 are always released. That is, the wax 135, the rod 132, the movable body 132a, the springs 133, 134, and the like constitute an actuator that opens and closes the piston valve body 131.
In addition, by appropriately adjusting the screwing amount of the nut 138, the compression amount of the spring 133 is changed, and the initial position of the piston valve body 131 with respect to the openings 103b and 104b opening on the side surface of the cylindrical passage 101 is adjusted. It is like that.

A cover member 170 is disposed outside the nut 138 and is detachably attached to the passage body 100. Accordingly, by removing the cover member 170, the first idle adjustment valve 130 (the stop position with respect to the openings 103b and 104b of the piston valve body 131) can be easily adjusted even after assembly. Etc. becomes easy.
A cylindrical passage 101 interposed between the upstream bypass passage 102a and the downstream bypass passages 103 and 104, and the downstream bypass passage 103 in a state in which the upstream bypass passage 102a is always released by sliding in the tubular passage 101. , 104 can be opened and closed to form a fast idle adjustment mechanism that adjusts (controls) the intake air amount during fast idle operation.

  As shown in FIGS. 2, 6, and 7, the idle adjustment valve 150 is disposed inside the second piston valve body 151 and the second cylindrical passage 106 that slide in the second cylindrical passage 106. A spring 152 that urges the piston valve body 151 in one direction, an adjustment screw 153 that contacts the second piston valve body 151 from the outside that antagonizes the spring 152 and is screwed into the passage body 100, and an adjustment screw 153 outward. It is formed by an urging spring 154 or the like.

Here, when the screwing amount of the adjusting screw 153 is increased manually, the second piston valve body 151 moves inward against the biasing force of the spring 152, and the opening area of the downstream connection passages 108 and 109 increases. When the idle intake amount increases and the screwing amount of the adjustment screw 153 decreases, the second piston valve body 151 moves outward by the biasing force of the spring 152, and the opening area of the downstream side connection passages 108 and 109 decreases. As a result, the idle intake amount decreases.
That is, the idle adjustment valve 150 manually rotates the adjustment screw 153 as appropriate so that the second piston valve body 151 slides in the second cylindrical passage 10 and changes the passage area of the connection passage. ing.
Here, since the idle adjustment valve 150 is formed by the second piston valve body 151, the spring 152, the adjustment screw 153, and the like divided respectively, the manufacture is easier than the case where they are formed integrally.

In the apparatus M, the first idle intake amount is adjusted by changing the initial position of the piston valve body 131 by appropriately adjusting the screw amount of the nut 138, and the idle intake amount is adjusted by screwing the adjustment screw 153. It is adjusted by changing the stop position of the second piston valve body 151 by appropriately adjusting the amount.
At this time, the relationship between the intake air amount flowing through the bypass passage and the set temperature is as shown in FIG. That is, even if the idle intake amount Qi or the first idle intake amount Qf when fully opened is changed, the intake air amount can be changed without changing the set temperatures Ti and Tf.

FIG. 9 shows an embodiment in which the bypass intake air amount control device according to the present invention is applied to a single-cylinder engine E ′ having one cylinder and one intake passage 1.
In this system, as shown in FIG. 9, an upstream bypass passage 301 communicating with the intake passage 1 upstream of the throttle valve 2 and a downstream bypass passage communicating with the intake passage 1 downstream of the throttle valve 2. 302, a tubular passage 303 that allows both passages 301 and 302 to communicate with each other on the side surface, a first idle adjustment valve 304 disposed in the tubular passage 303, an opening on the side surface of the tubular passage 3030, and the upstream bypass passage 301 and the downstream side A connecting passage 305 for communicating with the side bypass passage 302, an idle adjusting valve 306 for adjusting the passage area of the connecting passage 305, and the like are provided.

The first idle adjustment valve 304 has substantially the same configuration as the above-described first idle adjustment valve 130 except that the connector cover 190 is changed and the two downstream bypass passages 103 and 104 are made to communicate with each other. The description here is omitted.
The idle adjustment valve 306 is made of an adjustment screw formed as a single item, and the passage area of the connection passage 305 can be adjusted by adjusting the screwing amount.

In the above system, the bypass intake air amount control device M includes a part of the upstream bypass passage 301, a part of the downstream bypass passage 302, a cylindrical passage 303, a first idle adjustment valve 304, a connection passage 305, and an idle adjustment valve 306. 'Is configured. The upstream bypass passage 301 and the downstream bypass passage 302 form one bypass passage that bypasses (detours) the throttle valve 2.
In this apparatus, as in the above-described embodiment, the set temperature does not change even if the intake air amount is adjusted by the idle adjustment valve 306 or the first idle adjustment valve 304, the structure of the apparatus is simplified, and the number of parts is reduced. Reduced.

  As described above, the intake air amount control device of the present invention is simplified in structure and reduced in size, so that it is of course suitable for application to an intake system of an engine mounted on a motorcycle or the like. Of course, it can be used not only for two-wheeled vehicles but also for single-cylinder or multi-cylinder engines mounted on four-wheeled vehicles or other vehicles.

1 is a schematic configuration diagram illustrating an entire system to which an intake air amount control device according to the present invention is applied. It is sectional drawing which shows one Embodiment of the intake air amount control apparatus which concerns on this invention. 1 is a side view showing an embodiment of an intake air amount control device according to the present invention. (A), (b) is sectional drawing which shows the structure in a passage body. (A), (b) is sectional drawing which shows the structure in a passage body. (A), (b) is sectional drawing which shows the structure in a passage body. (A), (b) is sectional drawing which shows the structure in a passage body. It is a characteristic view which shows the relationship between intake air quantity and preset temperature. It is a schematic block diagram which shows the other system to which the intake air amount control apparatus which concerns on this invention is applied. (A), (b) is a schematic block diagram which shows the conventional intake air amount control apparatus. It is a schematic block diagram which shows the conventional intake air amount control apparatus. (A), (b) is a characteristic view which shows the relationship between the intake air amount and preset temperature in the conventional apparatus shown in FIG.

Explanation of symbols

E, E 'Engine S Cylinder M, M' Bypass intake air amount control device 1 Intake passage 1 'Intake pipe 2 Throttle valve 8 Injector 9 Surge tank (intake passage)
10 upstream bypass pipes 11 and 12 downstream bypass pipes 13 and 14 water pipe 100 passage body 101 cylindrical passage ( bypass intake air amount adjusting mechanism)
102 upstream connector 102a upstream bypass passages 103, 104 downstream bypass passages 103a, 104a openings 103b, 104b openings 105 one side surface 106 of passage body second cylindrical passage 107 upstream connection passage (idle adjustment mechanism)
108,109 Downstream side connection passage (idle adjustment mechanism)
110, 111 Second connection passage 130 Fast idle adjustment valve ( bypass intake air amount adjustment valve, bypass intake air amount adjustment mechanism)
131 Piston valve body 132 Rod (actuator)
133,134 Spring (actuator)
135 Wax (actuator)
136,137 Connector 138 Nut (Adjustment part)
150 Idle adjustment valve (Idle adjustment mechanism)
151 Second piston valve body 152 Spring 153 Adjustment screw 170 Cover member 190 Connector cover 191, 192 Downstream connector 200, 201 Bypass adjustment screw (adjustment mechanism)
301 upstream bypass passage 302 downstream bypass passage 303 cylindrical passage 304 fast idle adjustment valve (bypass intake air amount adjustment valve)
305 Connection passage 306 Idle adjustment valve

Claims (9)

A bypass passage that bypasses the throttle valve that opens and closes the intake passage of the engine;
A bypass intake air amount adjusting mechanism for adjusting an intake air amount flowing through the bypass passage;
An idle adjustment mechanism that adjusts the intake air amount during idle operation;
An intake air amount control device comprising:
The bypass intake air amount adjusting mechanism is
A cylindrical passage interposed so as to divide the bypass passage into an upstream bypass passage and a downstream bypass passage;
An opening of the downstream bypass passage that opens into the cylindrical passage;
A bypass intake air amount adjusting valve that can open and close an opening of the downstream bypass passage in a state in which the upstream bypass passage is always released by sliding in the cylindrical passage,
The idle adjustment mechanism includes:
A second cylindrical passage through which an idle adjustment valve capable of adjusting the passage area slides;
An upstream connecting passage that opens into the tubular passage and communicates the tubular passage and the second tubular passage;
A downstream connecting passage that communicates the second cylindrical passage and the downstream bypass passage;
A second connecting passage that opens to the cylindrical passage and connects the upstream bypass passage and the downstream bypass passage is further provided;
An intake air amount control device. In the second connection passage,
The intake air amount control device according to claim 1, wherein an adjustment mechanism for adjusting a passage area of the second connection passage is provided . The engine has a plurality of cylinders and an intake passage, and a plurality of the downstream bypass passage , the downstream connection passage, and the second connection passage are formed to correspond to the plurality of intake passages ,
In the plurality of second connection passages that open to the cylindrical passage,
A plurality of adjustment mechanisms for adjusting the passage area of the second connection passage are provided.
The intake air amount control device according to claim 1 . The bypass intake air amount adjusting valve adjusts an initial position of the piston valve body with respect to an opening of the downstream bypass passage, a piston valve body that slides in the cylindrical passage, an actuator that drives the piston valve body, and An adjustment section that can
The idle adjustment valve is formed so as to manually slide in the second cylindrical passage and adjust a passage area of the connection passage.
The bypass intake air amount control apparatus according to any one of claims 1 to 3. A passage body defining the cylindrical passage, the upstream bypass passage, the downstream bypass passage , the connection passage, and the second connection passage ;
The passage body may connect an upstream connector that can connect the upstream bypass passage to an intake passage upstream of the throttle valve, and a downstream bypass passage to an intake passage downstream of the throttle valve. A downstream connector;
The intake air amount control device according to claim 4 . The idle adjustment valve includes a second piston valve body that slides in the second cylindrical passage, a spring that biases the second piston valve body in one direction, and a second side that antagonizes the spring. An adjustment screw abutting on the piston valve body and screwed into the passage body,
The bypass intake air amount control device according to claim 5 . A cover member that covers the adjustment portion is detachably attached to the passage body.
The intake air amount control device according to claim 5 or 6 . The cylindrical passage and the second cylindrical passage are formed to extend in the same direction.
The intake air amount control device according to any one of claims 1 to 7, The downstream bypass passage has a plurality of openings formed so as to be biased in the moving direction of the piston valve body with respect to the side surface of the cylindrical passage.
The intake air amount control device according to any one of claims 1 to 8,

Images