JP2003003855A - Suction system of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize cost reduction and achieve size reduction. SOLUTION: A downstream end of an inlet manifold 4 connected to a cylinder 3 is divided and formed into a first suction port 4A and a second suction port 4B. A first valve 5 and a second valve 6 are installed in the first suction port 4A and the second suction port 4B, respectively. At the time of a low-load operation of an engine 1, while the first valve 5 is closed, the second valve 6 is opened, thereby generating swirls in the cylinder 3. At the time of a high- load operation of the engine 1, the first valve 5 and the second valve 6 are both opened to thereby introduce a large amount of intake air into the cylinder 3. With such construction, because a throttle body can be eliminated, it is possible to reduce the size of the inlet manifold by an installation space of the throttle body. Further, since both of the valves 5, 6 can be located at positions near the cylinder 3, response to accelerator manipulation by a driver is made better so that drivability can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system for an internal combustion engine having a swirl control function.

[0002]

2. Description of the Related Art As an example of the prior art, there is an intake device shown in FIG. This intake system is applied to an engine having two intake ports 110 for one cylinder 100, and a throttle valve 120 for adjusting the intake air amount and a swirl (swirl) for generating a swirl in the cylinder 100 at low load. And a swirl control valve 130.

The throttle valve 120 is incorporated in a throttle body 140 and is rotationally driven by a motor 150 in response to an accelerator operation by a driver. The swirl control valve 130 is provided only in one of the two intake ports 110 and is rotationally driven by the motor 160. This swirl control valve 130 is shown in FIG.
As shown in (a), it is controlled so that (a) closes at low load and (b) opens at high load. As a result, when the load is low, as shown by the arrow in the figure, the intake air is sucked into the cylinder 100 only through the other intake port 110, so that a swirl can be generated in the cylinder 100. .

[0004]

However, in the conventional intake device, the throttle valve 120 and the swirl control valve 130 are separately provided, and the dedicated motors are provided.
Since it has 150 and 160 (or negative pressure actuators), the cost is high, and since each requires an independent installation space, the increase in size is a problem. The present invention has been made based on the above circumstances, and an object of the present invention is to provide an intake device for an internal combustion engine, which can realize cost reduction and size reduction.

[0005]

(Invention of Claim 1) The present invention relates to an intake system for an internal combustion engine, comprising: a first intake port and a second intake port for each cylinder of the internal combustion engine. A first valve for adjusting the flow rate of the first intake port, a second valve for adjusting the flow rate of the second intake port, and a first valve according to the opening degrees of the first valve and the second valve.
Intake amount adjusting means for adjusting the intake air amount sucked into the cylinder through the intake port and the second intake port, and the first valve closes the first intake port when the internal combustion engine has a low load, and The second valve has a swirl generating means for generating a swirl in the cylinder by opening the second intake port.

According to this structure, since the throttle body is not required, the physique can be reduced by the space for disposing the throttle body, and the cost can be reduced. Also, since the first valve and the second valve can be made common (valves of the same shape can be used),
Parts management can be performed easily. Furthermore, when adjusting the intake air amount according to the opening degree of the first valve and the second valve, the first valve and the second valve are located closer to the cylinder than the conventional throttle valve. Since the vehicle can be placed in the vehicle, the responsiveness to the accelerator operation by the driver is improved and the drivability can be improved.

(Invention of Claim 2) In the intake system for an internal combustion engine according to Claim 1, the first valve and the second valve are driven by one actuator via a link mechanism. In this case, set the actuator (eg motor) to 1
Therefore, the cost can be reduced.

(Invention of Claim 3) In the intake system for an internal combustion engine according to claim 1, the first valve and the second valve are driven by separate actuators. In this case, by separately providing the actuator that drives the first valve and the actuator that drives the second valve, the ratio of the flow rates of the first valve and the second valve can be freely adjusted, A system excellent in controllability can be configured.

(Invention of Claim 4) The present invention is an intake system for an internal combustion engine, comprising a first intake port and a second intake port for each cylinder of the internal combustion engine. A bore chamber provided upstream of the second intake port, a butterfly-type valve disposed in the bore chamber for adjusting the flow rates of the first intake port and the second intake port, and the opening degree of the valve The intake air amount adjusting means for adjusting the intake air amount sucked into the cylinder through the first intake port and the second intake port, and the valve closes the first intake port when the internal combustion engine has a low load, and And a swirl generating means for generating a swirl in the cylinder by opening the second intake port.

In the bore chamber, the bore side surface on the side of the first intake port is formed by a concave curved surface curved in an arc shape or a spherical surface, the side surface of the bore on the side of the second intake port is formed by a straight surface, and the valve is While rotating both the first intake port and the second intake port by a predetermined amount from the fully closed position to the opening side, the first intake port is closed and only the second intake port is opened, and a predetermined amount or more is rotated. Then, the first intake port and the second intake port
Both intake ports can be opened. According to this configuration, the intake amount can be adjusted by one valve arranged in the bore chamber, and swirl can be generated when the load is low. That is, the function of the throttle valve and the function of the swirl control valve, which are conventionally provided separately, can be realized by one valve. As a result, the cost can be reduced by reducing the number of parts.

(Invention of Claim 5) In the intake system for an internal combustion engine according to claim 4, the bore chamber and the valve are provided for each cylinder of the internal combustion engine. In this case, as compared with the conventional throttle valve, the valve can be arranged at a position closer to the cylinder, so that the responsiveness to the accelerator operation by the driver is improved and the drivability can be improved.

(Invention of Claim 6) In the intake system for an internal combustion engine according to claim 5, a plurality of valves are driven by one actuator. In this case, the number of actuators can be inevitably reduced, and the cost can be reduced accordingly.

(Invention of Claim 7) In the intake system for an internal combustion engine according to claim 5, a plurality of valves are driven by different actuators. In this case, since the valve opening can be controlled for each cylinder, it is possible to optimally adjust the intake air amount for each cylinder.

(Invention of Claim 8) In the intake system for an internal combustion engine according to claim 4, the bore chamber and the valve are provided at one place for all cylinders of the internal combustion engine. In this case, the first number of cylinders (the number of cylinders) is reduced to the downstream side of the bore chamber
By providing the intake port and the second intake port separately, the bore chamber and the valve can be formed at one place. As a result, the number of valves can be one and the number of actuators for driving the valves can be one, so that the cost can be reduced by significantly reducing the number of parts.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. (First Embodiment) FIG. 1 is an intake path diagram from an air cleaner 2 to an engine 1. The intake device of the present embodiment,
As shown in FIG. 1, for example, it is mounted on a four-cylinder engine 1 and has an intake manifold 4 for guiding the air purified by an air cleaner 2 into each cylinder 3 of the engine 1.

The intake manifold 4 is provided such that its downstream ends connected to the respective cylinders 3 are branched into a first intake port 4A and a second intake port 4B, respectively. Valves (first valve 5 and second valve 6) for adjusting the amount of intake air are incorporated in each intake port 4B. First intake port 4A and second
As shown in FIG. 3, the intake ports 4B are provided at positions offset from the radial center of the cylinder 3 in opposite directions. First valve 5 and second valve 6
2 is provided so as to be mechanically connectable by a link mechanism 7 and driven by one motor 8 via the link mechanism 7 as shown in, for example, FIG. It

In the link mechanism 7, the motor 8 rotates a predetermined amount toward the valve opening side from the state where the first valve 5 and the second valve 6 close the intake ports 4A and 4B (the state shown in FIG. 2). Then, the rotational force of the motor 8 is transmitted only to the second valve 6, and when the motor 8 further rotates toward the valve opening side, the rotational force of the motor 8 is also transmitted to the first valve 5. As a result, the first valve 5 becomes the first valve only when the load is high.
The second intake valve 4A can be opened and the second valve 6 can open the second intake port 4B even when the load is low. When the motor 8 rotates toward the valve closing side, the springs 9 connected to the first valve 5 and the second valve 6, respectively,
Both valves 5, 6 can be rotated to the closing side by the reaction force of 10.

Next, the operation of the above-mentioned intake device will be described. a) At low load of the engine 1, the first valve 5 keeps the first intake port 4A closed,
The second valve 6 opens the second intake port 4B. As a result, as shown in FIG. 3A, the intake air flows into the cylinder 3 only through the second intake port 4B, so that a swirl (swirl) is generated in the cylinder 3.

B) At high load of the engine 1, both the first valve 5 and the second valve 6 open the intake ports 4A, 4B, respectively. As a result, as shown in FIG. 3B, a large amount of intake air flows into the cylinder 3 through both the first intake port 4A and the second intake port 4B. The opening degree of the second valve 6 at the time of low load and the opening degrees of the first valve 5 and the second valve 6 at the time of high load should be controlled corresponding to the accelerator operation by the driver. Needless to say.

(Effects of this Embodiment) According to the intake device of this embodiment, the first valve 5 arranged in the first intake port 4A and the second valve arranged in the second intake port 4B. Since the intake air amount can be adjusted by 6, the conventional throttle body can be eliminated. As a result, it is possible to reduce the size of the body by the space for disposing the throttle body. Further, when compared with the conventional intake device shown in FIG.
Although the total number of valves increases, the first valve 5 and the second valve 6 can be made common (valves of the same shape can be used), so there is an advantage that parts management can be facilitated.

Further, the first valve 5 and the second valve 6
When adjusting the intake air amount according to the opening degree of the driver, the first valve 5 and the second valve 6 can be arranged closer to the cylinder 3 as compared with the conventional throttle valve. The response to the accelerator operation is improved and the drivability can be improved. The motor 8
(Or a negative pressure actuator) may be provided for each cylinder 3.

(Second Embodiment) FIG. 4 shows an air cleaner 2.
3 is an intake path diagram from the engine to the engine 1. FIG. In the intake device of this embodiment, as in the first embodiment, the first valve 5 is arranged in the first intake port 4A and the second valve 6 is arranged in the second intake port 4B. The configuration is shown in FIG.
As shown in (1), the first valve 5 and the second valve 6 are driven by separate motors 8 (or negative pressure actuators). Also in this configuration, the basic operation is the same as that of the first embodiment, and the same effect as that of the first embodiment can be obtained.

(Third Embodiment) FIG. 5 shows an air cleaner 2.
3 is an intake path diagram from the engine to the engine 1. FIG. As shown in FIG. 5, the intake device of the present embodiment has a first intake port 4A.
A bore chamber 11 is provided upstream of the second intake port 4B, and a butterfly valve 12 is disposed in the bore chamber 11. As shown in FIG. 6, in the bore chamber 11, the bore side surface on the first intake port 4A side is formed by a concave curved surface 11a curved in an arc shape or a spherical shape, and the bore side surface on the second intake port 4B side is straight. It is formed by the surface 11b.

The valve 12 has a concave curved surface 11a of the bore chamber 11.
The rotating shaft 12a is attached to the center position of the radius of curvature forming This valve 1
2 has one end of the valve 12 while it is rotated by a predetermined amount from the fully closed position that closes both the first intake port 4A and the second intake port 4B toward the valve opening side (counterclockwise rotation direction in FIG. 6). By moving along the concave curved surface 11a of the bore chamber 11, the first intake port 4A can be closed and only the second intake port 4B can be opened. Further, when rotating by a predetermined amount or more, both the first intake port 4A and the second intake port 4B can be opened.

Next, the operation of the intake device will be described. a) When the engine 1 has a low load As shown in FIG. 6 (a), the valve 12 opens the second intake port 4B while keeping the first intake port 4A closed. As a result, intake air flows into the cylinder 3 only through the second intake port 4B, so that a swirl (swirl) is generated in the cylinder 3.

B) When the engine 1 has a high load As shown in FIG. 6B, the valve 12 opens both the first intake port 4A and the second intake port 4B. as a result,
A large amount of intake air flows into the cylinder 3 through both the first intake port 4A and the second intake port 4B. Needless to say, the opening degree of the valve 12 under low load and high load is controlled according to the accelerator operation by the driver.

(Effects of this Embodiment) According to the intake system of this embodiment, the intake air amount can be adjusted by the valve 12 arranged in the bore chamber 11, so that the conventional throttle body can be eliminated. As a result, it is possible to reduce the size of the body by the space for disposing the throttle body. Moreover, since the function of the conventional throttle valve and the function of the swirl control valve can be realized by one valve 12,
The cost can be reduced by reducing the number of parts.

Further, when adjusting the intake air amount according to the opening degree of the valve 12, the valve 12 can be arranged at a position closer to the cylinder 3 as compared with the conventional throttle valve. Response is improved and drivability can be improved.

(Fourth Embodiment) FIG. 7 shows an air cleaner 2
3 is an intake path diagram from the engine to the engine 1. FIG. The intake device according to the present embodiment has a bore chamber 11 and
Butterfly type valve 12 arranged in the bore chamber 11.
7 is different from the third embodiment in that the bore chamber 11 and the valve 12 are arranged on the inlet side of the intake manifold 4, as shown in FIG. In this case, the number of valves can be one and the number of motors 8 for driving the valves 12 can be one in the entire system, so that the cost can be reduced by greatly reducing the number of parts. The basic operation is the same as in the third embodiment.

In each of the above embodiments, the first intake port 4A and the second intake port 4B are offset from the radial center of the cylinder 3 in order to generate swirl in the cylinder 3 when the load is low. However, the positions of the first intake port 4A and the second intake port 4B may be inclined by 90 degrees and arranged in the stroke direction of the cylinder 3. As a result, a tumble flow can be generated in the cylinder 3 when the load is low.

[Brief description of drawings]

FIG. 1 is a diagram of an intake path from an air cleaner to an engine (first embodiment).

FIG. 2 is a schematic view of a link mechanism that transmits a rotational force of a motor to a valve.

FIG. 3 is an operation explanatory diagram of the first embodiment.

FIG. 4 is a diagram of an intake path from an air cleaner to an engine (second embodiment).

FIG. 5 is an intake path diagram from an air cleaner to an engine (third embodiment).

FIG. 6 is an operation explanatory view of the third embodiment.

FIG. 7 is an intake path diagram from an air cleaner to an engine (fourth embodiment).

FIG. 8 is a diagram of an intake path from an air cleaner to an engine (explaining conventional art).

FIG. 9 is an operation explanatory view according to the conventional technique shown in FIG.

[Explanation of symbols]

1 engine (internal combustion engine) 3 cylinders 4A First intake port 4B Second intake port 5 First valve 6 Second valve 7 Link mechanism 8 Motor (actuator) 11 bore room 11a concave curved surface 11b Straight surface 12 Butterfly type valve

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02D 9/02 361 F02D 9/02 361J 9/10 9/10 H F02M 69/00 F02M 69/00 360C 360 350W

Claims (8)

[Claims] 1. An intake system for an internal combustion engine comprising a first intake port and a second intake port for each cylinder of the internal combustion engine, the first valve adjusting a flow rate of the first intake port. A second valve that adjusts a flow rate of the second intake port; and a second valve that adjusts the flow rate of the first intake port and the second intake port according to the opening degrees of the first valve and the second valve. Intake air amount adjusting means for adjusting the intake air amount sucked into the cylinder; the first valve closes the first intake port when the internal combustion engine has a low load, and the second valve opens the first intake port. 2. An intake device for an internal combustion engine, comprising: a swirl generating means for generating a swirl in the cylinder by opening an intake port 2; 2. The intake system for an internal combustion engine according to claim 1, wherein the first valve and the second valve are driven by one actuator via a link mechanism. apparatus. 3. The intake system for an internal combustion engine according to claim 1, wherein the first valve and the second valve are driven by separate actuators. 4. An intake system for an internal combustion engine, comprising: a first intake port and a second intake port for each cylinder of the internal combustion engine, wherein the intake device is provided upstream of the first intake port and the second intake port. A bore chamber that is provided, a butterfly-type valve that is arranged in the bore chamber and that regulates the flow rates of the first intake port and the second intake port, and the first intake air according to the opening degree of the valve. Intake amount adjusting means for adjusting an intake air amount sucked into the cylinder through a port and a second intake port, the valve closing the first intake port when the internal combustion engine has a low load, and Swirl generating means for generating swirl in the cylinder by opening the second intake port, wherein the bore chamber has a concave surface in which a bore side surface on the side of the first intake port is curved in an arc shape or a spherical shape. Shaped with a curved surface The bore side surface on the side of the second intake port is formed as a straight surface, and the valve rotates a predetermined amount from the fully closed position where both the first intake port and the second intake port are closed to the open side. While the first intake port is closed, the first intake port is closed and only the second intake port is opened. When the first intake port is rotated by the predetermined amount or more, both the first intake port and the second intake port are opened. Intake device for internal combustion engine. 5. The intake system for an internal combustion engine according to claim 4, wherein the bore chamber and the valve are provided for each cylinder of the internal combustion engine. 6. The intake system for an internal combustion engine according to claim 5, wherein the plurality of valves are driven by one actuator. 7. The intake system for an internal combustion engine according to claim 5, wherein the plurality of valves are respectively driven by different actuators. 8. The intake system for an internal combustion engine according to claim 4, wherein the bore chamber and the valve are provided at one place for all cylinders of the internal combustion engine.