JP3521580B2 - Intake device for internal combustion engine - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an intake system for an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, in this type of intake system, in order to improve the output of an internal combustion engine, for example, Japanese Patent Laid-Open No.
As disclosed in Japanese Patent Laid-Open No. 4-316, a volume expansion chamber is connected via a connecting pipe to a collecting pipe portion (corresponding to a surge tank) of an intake manifold provided in an intake passage extending from an engine body of an internal combustion engine. Is connected, and an on-off valve is provided in the connection pipe part, and by opening this on-off valve, the collecting pipe part is communicated with the volume expansion chamber, thereby substantially expanding the volume of the collecting pipe part and improving the volume efficiency. There is one that is designed to improve the output of the internal combustion engine.

Further, in reducing the intake noise in the intake passage, it is known to increase the volume of the housing of the air cleaner in the intake passage and to adopt a Helmholtz type resonator. Further, there is a demand for a function of relieving the backfire pressure generated from the engine body toward the intake manifold in the combustion process of the internal combustion engine.

[0004]

By the way, in order to improve the volumetric efficiency and reduce the intake noise, a certain amount of volume is required independently. Further, in relief of the backfire as described above, it is necessary to add a new valve function to the surge tank section.

However, under the circumstances where the density of engine rooms has been increasing in recent years, it is difficult to secure independent volumes or add dedicated parts. Therefore, an object of the present invention is to provide an intake system for an internal combustion engine, in which parts are shared to achieve a plurality of functions in order to cope with such a situation.

[0006]

To achieve the above object, according to the present invention, as described in claim 1, a chamber portion is provided which can communicate with both the air cleaner volume portion and the surge tank portion. First and second opening / closing means are respectively provided in the first and second openings serving as the communicating portions, and means for selectively opening the openings by the control means is adopted.

As a result, when the first opening is opened, the volume of the air cleaner is expanded to reduce the intake noise, and when the second opening is opened, the surge tank is expanded to increase the volumetric efficiency of the internal combustion engine. Is improved. It should be noted that, as described in claim 1 , the control means has both openings closed.
By adopting a means of configuring one of the opening and closing to open, when selectively producing both the effects of reducing intake noise and improving volumetric efficiency in accordance with the number of revolutions, Both openings are prevented from being opened at the same time when switching.

[0008] The automatic by configuring the second opening and closing means to open upon receiving the backfire from the internal combustion engine as claimed in claim 2, the pressure at the time of backfire occurs from the surge tank to the chamber portion It becomes possible to relief it. As a result, the effects of reducing intake noise, improving volumetric efficiency, and backfire relief can be obtained.

As described in claim 4 , the first opening / closing means may be constructed so as to be opened by receiving backfire from the internal combustion engine. According to this, the surge tank portion is passed through the chamber portion. The backfire can be relieved to the air cleaner volume. In addition, claim 5
As described in (1), at least one of the first and second openings may be formed of a tubular body, and thereby either or both of the effect of reducing intake noise and the effect of improving volumetric efficiency can be tuned. For example, when the first opening is formed of a cylinder, the chamber portion can be a Helmholtz type resonator with respect to the air cleaner volume portion, which is different from the effect obtained by simply increasing the volume through the opening portion. Can be obtained.

In order to achieve the above object, the present invention provides a chamber portion capable of communicating with both the air cleaner volume portion and the surge tank portion as described in claim 3 , and also as a communicating portion thereof. First and second opening / closing means are provided in the first and second openings, respectively, and only one of the openings is controlled to be opened / closed by the control means in accordance with the rotation speed of the internal combustion engine. It adopts a method of receiving the backfire and automatically opening it.

As a result, when only the first opening is opened and closed by the control means, the intake noise can be reduced and the backfire relief can be performed by the second opening and closing means.
When only the opening is opened and closed by the control means, the volume efficiency can be improved and the backfire relief can be performed by the second opening and closing means. In addition, as described in claim 4 ,
The first opening / closing means may be configured to open by receiving backfire from the internal combustion engine, which allows the backfire to be relieved from the surge tank section to the air cleaner volume section via the chamber section. Become.

Further, as described in claim 5 , at least one of the first and second openings may be formed of a cylindrical body, whereby either the intake sound reducing effect or the volumetric efficiency improving effect is obtained. Or both can be tuned.
For example, when the first opening is formed of a cylinder, the chamber can be a Helmholtz type resonator with respect to the air cleaner volume, which is different from the case where the volume is simply increased through the opening. The effect can be obtained.

In order to achieve the above object, according to the present invention, as described in claim 6 , a chamber portion which can communicate with the surge tank portion is provided, and an opening / closing means is provided in an opening serving as the communication portion. The opening means is controlled to be opened / closed by the control means according to the rotational speed of the internal combustion engine, and the opening / closing means is configured to automatically open upon receiving backfire. As a result, the volume efficiency can be improved and the backfire can be relieved by the opening / closing means.

Further, as described in claim 7 , another opening portion which is further communicated with the chamber portion in the atmosphere direction is provided,
By providing another opening / closing means in the opening, the backfire may be further relieved in the atmosphere direction from the surge tank section via the chamber section. In this case, for example, the air cleaner volume also corresponds to the atmosphere direction, and it is desirable to relieve the backfire in the air cleaner volume.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows the overall structure of an intake system for an internal combustion engine for a vehicle according to the present invention. This intake device has a housing H connected to an engine body 10 of an internal combustion engine. The housing H is configured by combining resin molded products, and the housing H
Includes a dusty-side housing member 20 and a clean-side housing member 30.

The housing member 30 is detachably connected to the downstream opening 21 of the housing member 20 at the upstream opening 31 by fastening a clip 22. The downstream opening of the housing member 30. The numeral 32 communicates with the combustion chamber of each cylinder of the engine body 10. The air cleaner 40 is provided in the downstream opening portion 21 of the housing member 20, and the air cleaner 40 filters the intake air flowing into the housing member 20 to flow into the housing member 30.

The housing member 30 includes an air cleaner volume portion 30a, an air connector portion 30b, and a surge tank portion 30.
c, intake manifold section 30d and chamber section 3
0e is integrally provided. Air cleaner volume 30a
The upstream opening 31 constitutes the upstream opening 31, and the air cleaner volume 30a is formed integrally with the air connector portion 30b, the surge tank portion 30c, and the intake manifold portion 30d in a tubular shape. ing.

The air cleaner volume portion 30a, the air connector portion 30b and the surge tank portion 30c are formed by bending in a U shape as shown in FIG. 1, and the throttle valve is provided in the air connector portion 30b. 50 are provided. The throttle valve 50 allows the intake air flowing from the air cleaner 40 through the air cleaner volume 30a and into the air connector 30b to flow through the surge tank 30c and the intake manifold 30d.
Supply in.

Therefore, this intake air flow is mixed with the fuel injected by each fuel injector in the intake manifold portion 30d and supplied as a mixture into the combustion chamber of each cylinder of the engine body 10. The downstream manifold opening of the intake manifold portion 30d constitutes the downstream opening 32. The chamber portion 30e includes a surge tank portion 30c between the air connector portion 30b and the surge tank portion 30c.
An opening 33 is formed in the side wall of the air cleaner volume 30a of the chamber 30e so as to open into the upstream side opening 31 of the air cleaner volume 30a. On the other hand, an opening 34 is formed in the side wall portion of the surge tank portion 30c of the chamber portion 30e so as to open toward the inside of the surge tank portion 30c.

The reason why the chamber portion 30e is provided as described above is as follows. First, it is known that the volumetric efficiency of the internal combustion engine changes depending on the volume of the surge tank portion 30c. When the volume of the surge tank portion 30c is reduced, the volume efficiency of the internal combustion engine on the low rotation speed side is improved, while when the volume of the surge tank portion 30c is increased, the volume efficiency of the internal combustion engine on the high rotation speed side is improved. To do. Therefore, the chamber portion 30e is provided in order to utilize such a phenomenon in the present embodiment.

It is also known that the intake noise is reduced when the air cleaner volume 30a is increased. Here, in consideration of the fact that the chamber portion 30e is not used in the low to medium rotational speed region in improving the volumetric efficiency, the intake noise can be reduced by expanding the air cleaner volume portion 30a using the chamber portion 30e. . Therefore, the chamber portion 30e is provided in order to utilize such a phenomenon in the present embodiment.

In the high speed region, the chamber section 30
Since e is used as the volume expansion of the surge tank portion 30c, the effect of reducing the intake noise cannot be expected in the low rotation speed region, but the intake noise in the high rotation speed region is almost a problem compared with the low and middle rotation speed region. It does not happen. Each valve mechanism 60, 70
It is provided to open and close each of the openings 33 and 34.

The valve mechanism 60 is provided with a plate-shaped valve body 61 that constitutes a valve portion together with the opening portion 33. The valve body 61 has a central portion in the opening portion 33 in FIG. It is rotatably supported at the center in the direction. In addition, the valve mechanism 60
Is equipped with a negative pressure motor 62.
1 is fitted to the side wall portion of the air connector portion 30b of the chamber portion 30e, as shown in FIG.

Further, the negative pressure motor 62 is provided with both casing portions 62a and 62b.
A diaphragm 62c is sandwiched between 2a and 62b to form a negative pressure chamber and an atmospheric pressure chamber in each of the casing portions 62a and 62b. A coil spring (not shown) is assembled in the negative pressure chamber, and the coil spring biases the diaphragm 62c toward the atmospheric pressure chamber.

The negative pressure motor 62 has an operating rod 62d, and this operating rod 62d is a diaphragm 62.
The central portion of c extends through the atmospheric pressure chamber in the casing portion 62a into the chamber portion 30e, and is rotatably connected to the left end portion 61a of the valve body 61 shown in FIG. The negative pressure chamber in the casing portion 62a includes a pipe P1 and this pipe P1.
It is adapted to selectively communicate with the downstream side of the throttle valve 50 in the air connector portion 30b through an electromagnetic switching valve 63 interposed therein.

However, when a negative pressure is generated in the negative pressure chamber of the negative pressure motor 62, the diaphragm 62c is displaced toward the negative pressure chamber side against the coil spring and the operating rod 62d.
Rotates the valve body 61 counterclockwise in FIG. 1 to open the opening 33. On the other hand, when the negative pressure in the negative pressure chamber is released, the diaphragm 62c is pushed by the coil spring to be displaced toward the atmospheric pressure chamber side, and the operating rod 62d.
Rotates the valve body 61 clockwise in FIG. 1 to close the opening 33.

The electromagnetic switching valve 63 supplies a negative pressure generated on the downstream side of the throttle valve 50 by the excitation of its solenoid into the negative pressure chamber, and demagnetizes the solenoid to open the negative pressure chamber to the atmospheric pressure. . The valve mechanism 70 includes a plate-shaped valve body 71 that constitutes a valve portion together with the opening 34. The valve body 71 has a central portion in the opening 34 in the left-right direction central portion shown in FIG. It is rotatably supported by. Further, the valve mechanism 70 includes a negative pressure motor 72, and the negative pressure motor 72 is fitted to a wall portion of the chamber portion 30e facing the side wall portion of the air connector portion 30b as shown in FIG. There is.

Further, the negative pressure motor 72 is provided with both casing portions 72a and 72b.
A diaphragm 72c is sandwiched between 2a and 72b to form a negative pressure chamber and an atmospheric pressure chamber in each of the casing portions 72a and 72b. A coil spring (not shown) is assembled in the negative pressure chamber inside the casing 72a, and the coil spring is used as the diaphragm 72.
c is urged to the atmospheric pressure chamber side in the casing portion 72b.

The negative pressure motor 72 has an operating rod 72d, and this operating rod 72d is connected to the diaphragm 72.
It extends from the central portion of c through the atmospheric pressure chamber in the casing portion 72b into the chamber portion 30e and is rotatably connected to the right end portion 71a of the valve body 71 shown in FIG. The negative pressure chamber in the casing portion 72a includes the pipe line P2 and the pipe line P2.
It is configured to selectively communicate with the surge tank portion 30c through an electromagnetic switching valve 73 interposed therein.

When a negative pressure is generated in the negative pressure chamber of the negative pressure motor 72, the diaphragm 72c is moved to the casing portion 72.
It is displaced toward the negative pressure chamber side against the coil spring in a, and the operating rod 72d rotates the valve body 71 in the clockwise direction shown in FIG. 1 to open the opening 34. On the other hand, when the negative pressure in the negative pressure chamber is released, the diaphragm 72c is pushed by the coil spring and displaced toward the atmospheric pressure chamber side, and the operating rod 72d moves the valve body 71 to the counterclockwise direction shown in FIG. And the opening 34 is closed.

The electromagnetic switching valve 73 supplies a negative pressure generated in the surge tank portion 30c to the negative pressure chamber by exciting the solenoid, and demagnetizes the solenoid to open the negative pressure chamber to the atmospheric pressure. Next, the circuit configuration for controlling the drive of both electromagnetic switching valves 63, 73 is shown in FIG.
2 and FIG. 2.

The electromagnetic pickup type rotation speed sensor 80 is
The rotation speed of the internal combustion engine is detected and a detection signal is generated at a frequency proportional to this rotation speed. The controller 90
The waveform shaping circuit 91 is provided.
Waveform-shapes each detection signal from the rotation speed sensor 80 and generates it as a pulse signal.

The signal processing circuit 92 processes the cycle of each pulse signal from the waveform shaping circuit 91 as the reciprocal of the number of revolutions of the internal combustion engine, based on the clock signal C1 having a constant frequency from the clock circuit 93, and then It is output to the microcomputer 94 as cycle data of the number of revolutions. The microcomputer 94 executes the computer program according to the flowchart shown in FIG. 3 based on the clock signal C2 having a constant frequency from the clock circuit 93, and during this execution, switches between the electromagnetic switching based on the output data of the signal processing circuit 92. The arithmetic processing required to control both drive circuits 95 and 96 for driving the valves 63 and 73 is performed.

In the first embodiment constructed as described above, when the internal combustion engine of the vehicle is in the operating state, the intake air flow into the housing member 20 is filtered by the air cleaner 40 and flows into the housing member 30. Then, the intake air flow causes the air cleaner volume portion 30a, the air connector portion 30b, the throttle valve 50, and the surge tank portion 30c.
And is mixed with fuel in the intake manifold portion 30d and flows into the combustion chamber of each cylinder of the engine body 10 as a mixture.

When the microcomputer 94 is powered by the DC power source of the vehicle, the microcomputer 94 starts executing the computer program according to the flowchart of FIG. Then, step 100
At, initial processing is performed. This initial processing includes initial values set for the RAM and input / output ports of the microcomputer 94, initial values set for operating the microcomputer 94, and the like.

Next, at step 101, the output cycle data from the signal processing circuit 92 is set as A. Then, in step 102, the rotation speed N of the internal combustion engine is calculated according to the cycle data A based on the following equation (1).

[0037]

## EQU1 ## N = K / A In the expression of Equation 1, the symbol K indicates a constant. After this calculation, in step 103, the rotation speed N is the reference rotation speed N.
Compared with _O. Here, the reference rotation speed N _O is determined from the torque characteristic of the internal combustion engine, and is, for example, 2500 r.
p. m. Equivalent to.

However, if the rotation speed N is less than the reference rotation speed N _O , the determination in step 103 is NO.
Then, in step 104, the electromagnetic switching valve 73
Demagnetization processing of the solenoid is performed, and then step 1
In 05, the excitation process is performed so that the solenoid of the solenoid operated directional control valve 63 is excited after the elapse of the predetermined delay time t.

However, during the predetermined delay time t, a portion of the intake flow does not pass through the throttle valve 50 and the chamber portion 30e
Through the air cleaner volume 30a to the surge tank 3
In order to prevent the situation of flowing into 0c, the chamber portion 30e
It plays a role of preventing the simultaneous opening of both openings 33 and 34, and is set to a value of less than about 1 second, for example.

When the solenoid of the electromagnetic switching valve 73 is demagnetized according to the degaussing process, the electromagnetic switching valve 73 opens the negative pressure chamber of the servomotor 72 to the atmospheric pressure, and the servomotor 72 operates. Working rod 72c
The valve body 71 closes the opening 34. After that, when the solenoid of the electromagnetic switching valve 63 is excited in accordance with the above-described excitation processing after the elapse of the predetermined delay time t, the electromagnetic switching valve 63 is connected to the negative pressure chamber of the servo motor 62 and the throttle valve 50 of the air connector portion 30b. Supply negative pressure from the downstream side. Then, the servomotor 62 causes the operating rod 62 to
The opening 33 is opened at the valve body 61 by c.

As a result, the air cleaner volume 30a is expanded by the volume of the chamber 30e, so that the intake noise can be reduced. At this time, the surge tank section 30c
Since the volume of is maintained as it is by closing the opening 34, the volume efficiency in the low rotation speed region can be improved. On the other hand, if the determination in step 103 is YES, the solenoid of the electromagnetic switching valve 63 is demagnetized in step 106, and then in step 107, the solenoid of the electromagnetic switching valve 73 is deenergized for the predetermined delay time t.
Excitation processing is performed so that the magnetic field is excited after the passage of.

When the solenoid of the electromagnetic switching valve 63 is demagnetized according to the above demagnetization processing, the electromagnetic switching valve 63 opens the negative pressure chamber of the servo motor 62 to the atmospheric pressure, and the servo motor 62 operates. Working rod 62c
The valve body 61 closes the opening 33. After that, when the solenoid of the electromagnetic switching valve 73 is excited in accordance with the above-described excitation processing after the elapse of the predetermined delay time t, the electromagnetic switching valve 73 is connected to the negative pressure chamber of the servomotor 72 and the throttle valve 50 of the air connector portion 30b. Supply negative pressure from the downstream side. Then, the servomotor 72 causes the operating rod 72 to
The opening 34 is opened at the valve body 71 by c.

As a result, the volume of the surge tank portion 30c is expanded by the volume of the chamber portion 30e. For this reason,
The volumetric efficiency of the internal combustion engine can be improved in the high speed range. In this case, since the chamber portion 30e is shared in order to improve the volumetric efficiency of the internal combustion engine in the high rotation speed region,
Useful for saving space in the engine room. By the way, when the relationship between the rotational speed of the internal combustion engine and the volumetric efficiency was examined by experiments, the results shown in FIG. 4 were obtained. Where the symbol L
1 indicates the relationship between the volumetric efficiency and the rotation speed when the opening 34 is closed, while reference symbol L2 indicates the relationship between the volumetric efficiency and the rotation speed when the opening 34 is open.

According to this, the rotation speed N is the reference rotation speed N _O.
In the lower region, it is understood that the volume efficiency is higher when the opening 34 is closed and the volume of the surge tank portion 30c is not increased. Further, in the region where the rotation speed N is higher than the reference rotation speed N _O , it is understood that the volume efficiency is higher when the opening portion 34 is opened to increase the volume of the surge tank portion 30c. Also,
When the relationship between the rotation speed of the internal combustion engine and the intake noise was examined by an experiment, the results shown in FIG. 5 were obtained. Where the symbol L
Reference numeral 3 indicates the relationship between the rotational speed and the intake sound when the opening 33 is closed, while reference symbol L4 indicates the relationship between the rotational speed and the intake sound when the opening 33 is open.

According to this, the rotation speed N is the reference rotation speed N _O.
In the lower region, it is understood that the effect of reducing the intake noise is higher when the opening 33 is opened to increase the volume of the air cleaner volume 30a. FIG. 6 shows a modification of the first embodiment. In this modified example, the communication pipe 33a
Is formed so as to extend from the opening 33 of the chamber portion 30e toward the inside of the air cleaner volume portion 30a. This communication pipe 33
a plays a role of causing the chamber portion 30e to function as a Helmholtz type resonator.

As a result, the intake noise in the specific frequency range can be effectively reduced. Other configurations and operational effects are similar to those of the first embodiment. The communication pipe 33a formed in the above modification may be formed not in the opening 33 but in the opening 34 and the volume efficiency may be tuned. FIG. 7 shows a main part of the second embodiment of the present invention.

In the second embodiment, the valve element 61 described in the first embodiment is rotatably supported in the opening 33 at the right end in the figure in FIG. . Further, the negative pressure motor 62 described in the first embodiment is fitted to the peripheral wall of the air cleaner volume 30a at a position where it faces the opening 33 through the inside of the air cleaner volume 30a. The operating rod 62d of the motor 62 extends into the air cleaner volume 30a and is rotatably connected to the left end 61a of the valve body 61 shown in FIG.

Further, the negative pressure motor 62 communicates with the downstream side of the throttle valve 50 of the air connector portion 30b via the pipe P3 and the electromagnetic switching valve 63 provided in the pipe P3. On the other hand, the valve body 71 described in the first embodiment has the opening 3 at the right end in FIG.
4 is rotatably supported in the inside. The negative pressure motor 72 described in the first embodiment is fitted to the side wall portion of the air connector portion 30b of the chamber portion 30e instead of the negative pressure motor 62 described in the first embodiment. The operation rod 72d of the negative pressure motor 72 extends into the chamber portion 30e and is rotatably connected to the left end portion 71a of the valve body 71 shown in FIG.

The negative pressure motor 72 communicates with the downstream side of the throttle valve 50 of the air connector portion 30b via the pipe P1 and the electromagnetic switching valve 73 provided in the pipe P1. Other configurations are similar to those of the first embodiment. In the second embodiment configured as described above, in the operating state described in the first embodiment, the combustion of the air-fuel mixture from the engine body 10 passes through the intake manifold portion 30d and the surge tank portion 30c is backfired. When pressure is generated, this backfire pressure acts on the valve body 71 and the operating rod 72d against the elastic force of the coil spring in the negative pressure chamber of the negative pressure motor 72.

For this reason, the valve body 71 has the chamber portion 30e.
Rotate inward to open the opening 34. In this case, the connecting portion between the shaft support portion of the valve body 71 and the operating rod 72d is the valve body 71 shown in FIG.
Since the valve body 71 is located at both ends in the figure, the valve body 71 is easily rotated into the chamber portion 30e under the backfire pressure. Further, when the backfire pressure acts on the inside of the chamber portion 30e due to the opening of the opening 34 in this way, the backfire pressure resists the elasticity of the coil spring in the negative pressure chamber of the negative pressure motor 62 and the valve body 61 and It acts on the operating rod 62d.

Therefore, the valve body 61 rotates into the air cleaner volume 30a to open the opening 33. In this case, the connecting portion between the shaft support portion of the valve body 61 and the operating rod 62d is the valve body 6
7, the valve element 61 is easily rotated into the air cleaner volume 30a under the backfire pressure. As described above, both openings 34, 3
By sequentially opening 3, the backfire pressure in the surge tank portion 30c is smoothly relieved in the air cleaner volume portion 30a in a timely manner.

As a result, the chamber portion 30e is shared to secure the space saving of the engine room, and
In addition to the improvement of the volumetric efficiency and the reduction of the intake noise described in the embodiment, the impact due to the backfire pressure in the housing member 30 can be alleviated. As a result, even if the housing member 30 is resinized, the housing member 3
No damage due to backfire pressure from the engine body 10 will occur.

FIG. 8 shows the essential parts of a third embodiment of the present invention. In the third embodiment, the chamber section 30
The coil spring 64 fixed in place in e
1 is connected to the right end portion in FIG. For this reason,
The negative pressure motor 62, the pipe P3, and the electromagnetic switching valve 63 are eliminated. Along with this, steps 105 and 106 in the flowchart of FIG. 3 are also abolished. Other configurations are similar to those of the second embodiment.

In the third embodiment constructed as described above, the valve element 34, as described in the second embodiment, is
When the backfire pressure in the surge tank section 30c is received and the opening section 34 is opened by rotating into the chamber section 30e, the backfire pressure resists the elasticity of the coil spring 64 to move the valve body 61 into the air cleaner volume section 30a. The opening 33 is opened by rotating it to the side.

In this way, by opening both openings 34, 33 in sequence, the backfire pressure in the surge tank portion 30c is smoothly relieved in the air cleaner volume portion 30a in a timely manner. As a result, while sharing the chamber portion 30e to save space in the engine room,
In addition to the improvement in volume efficiency described in the second embodiment,
The impact due to the backfire pressure in the housing member 30 can be mitigated.

A check valve may be employed instead of the coil spring 64, the valve element 61 and the opening 33, and the check valve may be opened by backfire pressure. FIG. 9 shows an essential part of the fourth embodiment of the present invention. In the fourth embodiment, the coil spring 74 fixed in place in the surge tank portion 30c is connected to the right end portion of the valve body 71 shown in FIG. Therefore, the negative pressure motor 72, the pipe P1 and the electromagnetic switching valve 73 are eliminated. Along with this, steps 104 and 107 in the flowchart of FIG. 3 are also abolished. Other configurations are similar to those of the second embodiment.

In the fourth embodiment having such a configuration, the valve element 34, as described in the second embodiment, is
Upon receiving backfire pressure in the surge tank section 30c, the chamber section 3 resists the elasticity of the coil spring 74.
When the opening 34 is rotated by rotating the valve body 61 toward 0e, the backfire pressure causes the valve body 61 to rotate toward the air cleaner volume 30a side to open the opening 33.

In this way, by opening both openings 34, 33 in sequence, the backfire pressure in the surge tank portion 30c is smoothly relieved in the air cleaner volume portion 30a in a timely manner. As a result, while sharing the chamber portion 30e to save space in the engine room,
In addition to the improvement of the intake sound described in the second embodiment, the impact due to the backfire pressure in the housing member 30 can be mitigated.

A check valve may be adopted instead of the coil spring 74, the valve body 71 and the opening 34 described above, and the check valve may be opened by backfire pressure. Further, the cylinder described in the modification of the first embodiment may be applied to the configurations of the second, third and fourth embodiments. Further, the valve body 71 provided at least in the second opening 34
It may be configured such that only the backfire is automatically opened by receiving the pressure of the backfire, and the abnormal increase in the surge tank pressure due to the backfire can be mitigated by increasing the volume of the chamber. The anti-backfire performance of the tank portion 30c can be improved.
Further, an opening may be formed on the wall surface of the chamber portion 30e facing the atmosphere, and an opening / closing means may be provided there to directly release the pressure of the backfire to the atmosphere side.

Further, in the second embodiment, both valve bodies 6 are
The pivotal support positions of the valve bodies 1 and 71 and the connecting positions of the operating rods 62d and 72d to the valve bodies 61 and 71 are set to the valve bodies 6
Although it is arranged at both ends of Nos. 1 and 71, in addition to this, the spring constants of the coil springs of both the negative pressure motors 62 and 72 are also adjusted to rotate the both valve bodies 61 and 17 by the backfire pressure. You may implement so that it may be ensured more smoothly.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a main part cutaway showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing the electric circuit configuration of FIG.

FIG. 3 is a flowchart showing the operation of the microcomputer of FIG.

FIG. 4 is a graph showing the relationship between the volumetric efficiency of the internal combustion engine and the rotational speed according to the open / closed state of the opening.

FIG. 5 is a graph showing the relationship between the intake sound of the internal combustion engine and the rotational speed according to the open / close state of the opening 33.

FIG. 6 is a main-portion cross-sectional view showing a modification of the first embodiment.

FIG. 7 is a fragmentary configuration diagram showing a second embodiment of the present invention.

FIG. 8 is a fragmentary configuration diagram showing a third embodiment of the present invention.

FIG. 9 is a fragmentary configuration diagram showing a fourth embodiment of the present invention.

[Explanation of symbols]

H ... Housing, 10 ... Engine body, 20, 30
・ ・ ・ Housing member, 30a ・ ・ ・ Air cleaner volume, 30b ・ ・ ・ Air connector, 30c ・ ・ ・ Surge tank, 30d ・ ・ ・ Intake manifold, 3
0e ... Chamber part, 33, 34 ... Opening part, 33
a ... communication pipe, 40 ... air cleaner, 60, 70
... Valve mechanism, 61, 71 ... Valve body, 62, 72 ...
-Negative pressure motor, 62d, 72d ... Actuating rod, 6
3, 73 ... Electromagnetic switching valve, 64, 74 ... Coil spring, 80 ... Rotation speed sensor, 90 ... Controller, 94 ... Microcomputer.

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Akihide, 1-1, Showa-cho, Kariya city, Aichi Prefecture, Nippon Denso Co., Ltd. (72) Inventor, Shuya Mikami, 1-1, Showa-cho, Kariya city, Aichi Nippon Denso Within the corporation (56) Reference JP-A-2-119622 (JP, A) JP-A-6-117257 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F02B 27/02 F02M 35/14

Claims (7)

(57) [Claims] 1. An air cleaner volume (30a) containing an air cleaner (40) for filtering the intake air flow to an internal combustion engine.
A throttle valve (50) provided downstream of the air cleaner volume, a surge tank portion (30c) provided downstream of the throttle valve, and a first opening (33) with respect to the air cleaner volume. And a chamber portion (30e) that is provided so as to be able to communicate with each other through the second opening portion (34) with respect to the surge tank portion, and a first opening and closing for opening and closing the first opening portion. Means (61), a second opening / closing means (71) for opening / closing the second opening, and only one of the first and second openings when the rotational speed of the internal combustion engine satisfies a predetermined condition. Control means (62, 72, 80, 90) for driving and controlling the first and second opening / closing means so as to open , the control means opening both after closing both openings.
Memorial configured have an intake system for an internal combustion engine characterized by Rukoto. 2. An air cleaner for filtering an intake air flow to an internal combustion engine.
Air cleaner volume (30a) accommodating the corner (40)
And a slot provided downstream from this air cleaner volume.
Valve (50) and a surge tank portion provided downstream of the throttle valve
(30c) and the first opening (33) with respect to the air cleaner volume.
And the surge tank
The second opening (34) is provided so that it can communicate with
The chamber part (30e) to be struck and the first opening part.
First opening / closing means (61) for closing and opening / closing the second opening
The second opening / closing means (71) and the rotation speed of the internal combustion engine are predetermined.
When the condition is satisfied, either the first opening or the second opening
Drive the first and second opening / closing means to open only one of them.
And a control means (62, 72, 80, 90) for dynamically controlling
For example, the second opening and closing means opens receives backfire of an internal combustion engine, an intake system for an internal combustion engine you characterized in that it is configured to communicate with said surge tank said chamber portion. 3. An air cleaner volume (30a) containing an air cleaner (40) for filtering the intake air flow to an internal combustion engine.
A throttle valve (50) provided downstream of the air cleaner volume, a surge tank portion (30c) provided downstream of the throttle valve, and a first opening (33) with respect to the air cleaner volume. And a chamber portion (30e) that is provided so as to be able to communicate with each other through the second opening portion (34) with respect to the surge tank portion, and a first opening and closing for opening and closing the first opening portion. Means (61), a second opening / closing means (71) for opening / closing the second opening, and only one of the first and second openings when the rotational speed of the internal combustion engine satisfies a predetermined condition. Control means (62, 72, 62) for controlling the driving of only one of the first and second opening / closing means to open.
80, 90), and the second opening / closing means is configured to open by receiving backfire from the internal combustion engine, and to connect the surge tank section and the chamber section to each other. Intake device. Wherein said first switching means is opened by receiving a backfire from the internal combustion engine, according to claim 2 or 3, characterized in that the said chamber portion said air cleaner volume is configured so as to communicate An intake system for an internal combustion engine according to item 1. 5. to at least one of the first and second openings, the tubular member (33a) according to any one of claims 1 to 4, characterized in that are provided Intake device for internal combustion engine. 6. A surge tank part (30c) provided in an intake passage to an internal combustion engine, and a chamber part (30e) provided so as to be able to communicate with the surge tank part through an opening (34), An opening / closing means (71) for opening and closing the opening, and a control means (7) for driving and controlling the opening and closing means so as to open the opening when the rotation speed of the internal combustion engine satisfies a predetermined condition.
2, 80, 90), wherein the opening / closing means is configured to open by receiving backfire from the internal combustion engine and to communicate the surge tank section and the chamber section. Intake device. 7. An opening (33) capable of communicating the chamber portion in the atmosphere direction, and another opening / closing means (61) for receiving the backfire from the internal combustion engine and opening the other opening. The intake system for an internal combustion engine according to claim 6 , wherein: