JPH051828U - Engine intake system - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] In an engine equipped with an opening / closing valve for switching the intake path that is driven to open / close by a negative pressure responsive actuator, the opening / closing valve can be operated without enlarging the actuator. Provided is an intake device capable of preventing the valve body from fluttering when it is fully opened or fully closed. In an intake system for an engine provided with an opening / closing valve 10 for changing a state of an intake passage and a negative pressure responsive actuator 13 for opening / closing the opening / closing valve 10, the opening / closing valve 10 is fully opened when the opening / closing valve 10 is opened / closed. Alternatively, an urging spring 34 or an electromagnet is provided to assist the opening / closing driving force of the actuator 13 when it is fully closed. Preferably, the urging force is weakened during the opening / closing operation of the on-off valve 10, and more preferably, the on-off valve 10 is for opening and closing the communication passage between the intake collecting portions, and is normally closed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to an engine intake device.

[0002]

[Prior art]

  Engine designed for pressure wave supercharging by utilizing inertial effect or resonance effect Has been known for a long time, and such an engine requires no special supercharger. However, the charging efficiency, that is, the engine output can be increased to some extent. There is a point.   However, such pressure wave supercharging is dependent on the intake port and the pressure provided on the upstream side. Relatively narrow rotation range determined by the length of the intake path between the wave reflection part (volume, etc.) The supercharging effect only increases in the region. Therefore, the intake path to the combustion chamber (or intake (Path length) can be changed, and the intake path can be switched according to the engine speed. A so-called variable intake system is provided that can enhance the supercharging effect in a high rotation range. Is being proposed. In addition, such switching of the intake path is generally performed in accordance with the predetermined intake path. This is done by opening and closing the part of Actuator consisting of a negative pressure responsive diaphragm device that utilizes the negative pressure in the intake passage It is designed to be opened / closed by a motor (for example, the actual opening 63-1022). 5).

[0003]

[Problems to be solved by the device]

  By the way, the negative pressure in the intake passage is not so high under normal engine load conditions. Therefore, it is opened and closed by a normal negative pressure responsive actuator that uses this negative intake pressure. When the open / close valve is opened, the driving force is sometimes insufficient, There is a problem that the valve body flaps when it is fully closed when the valve is closed. this To prevent the flaps from opening and closing like this, increase the driving force of the actuator sufficiently. Although it is necessary to increase the driving force of the negative pressure actuator, Since the pressure receiving area of the earflam has to be considerably large, the actuator It will be large and costly, and the layout will be difficult. I have a problem.

[0004]   The present invention has been made in order to solve the above-mentioned conventional problems. Opening and closing for switching the intake path driven by opening and closing by a dynamic actuator Opening and closing an engine with a valve without increasing the size of the actuator To prevent the flap from fluttering when the valve reaches full open or fully close. An object of the present invention is to provide an engine air intake device that can achieve the following.

[0005]

[Means for Solving the Problems]

  In order to achieve the above-mentioned object, the first invention is to open and close the intake passage state. The valve and the actuator that drives the on-off valve to open and close depending on whether negative pressure is introduced or not. In the engine intake device provided, the opening / closing valve is opened and closed during the opening / closing operation of the opening / closing valve. When the actuator reaches at least one of fully closed and fully opened, the opening / closing drive force of the actuator is assisted. The engine intake device is characterized in that it is provided with an external urging means for urging it. To serve.

[0006]   A second aspect of the present invention is an engine air intake device according to the first aspect, wherein an external biasing device is used. When the open / close valve is fully open or fully closed, the open / close valve partially opens. It is formed so that the urging force is stronger than when it is An intake system for an engine is provided.

[0007]   According to a third aspect of the invention, in the engine air intake device according to the second aspect, The intake air supply system is divided into two first and second branch intake air supply systems. Each intake supply system is provided with an intake manifold, and both intake manifolds communicate with each other. Communication passage is provided, and the on-off valve opens and closes the communication passage. An intake system for an engine is provided.

[0008]   A fourth invention is the engine air intake device according to the second or third invention, The on-off valve is a normal claw that is fully opened when negative pressure is introduced to the actuator. (EN) Provided is an intake device for an engine, which is of a closed type.

[0009]

【Example】

  Hereinafter, embodiments of the present invention will be specifically described.   <First embodiment>   As shown in FIG. 2, on the first bank A side of the 6-cylinder V-type engine VE, the ignition sequence is Cylinders # 1, # 3, # 5 that are not continuous with each other are arranged in the second bank On the B side, the second, fourth, and sixth cylinders # 2, # 4, and # 6, whose ignition order is not continuous, are arranged. It is placed. In each of the cylinders # 1 to # 6, the independent intake passage 1 A mixture is supplied into the cylinder 2 from this, and this mixture is generated by a piston (not shown). After being compressed, it can be ignited and burned with a spark plug.

[0010]   An intake device Q is provided to supply air to each cylinder # 1 to # 6 of the engine VE. In the common intake passage 3 of the intake device Q, the air cleaner 4 and the air cleaner 4 are sequentially arranged from the upstream side. A flow meter 5 and a throttle body 6 equipped with a throttle valve (not shown) It is provided. On the downstream side from the throttle body 6, the intake path is in the first bank. Branched to the first branch intake passage 7a on the A side and the second branch intake passage 7b on the second bank B side However, the downstream end of the first branch intake passage 7a is the front end of the first intake collecting portion 8a (the left end in FIG. 2). Part), and the downstream end of the second branch intake passage 7b is at the front end of the second intake collecting portion 8b. It is connected. Here, in the first intake collecting portion 8a, the first, third, and fifth cylinders # 1, # 3, the independent intake passages 1, 1, 1 for # 5 are connected, and the second intake collecting portion 8b has the second, The independent intake passages 1, 1, 1 for the fourth and sixth cylinders # 2, # 4, # 6 are connected.

[0011]   Then, the pressure wave supercharging due to the inertial effect or the resonance effect can be effectively performed. To this end, the first intake collecting portion 8a and the second intake collecting portion 8b are arranged in the longitudinal direction (see FIG. 2). The first communication passage 9 that communicates with each other at substantially the central portion in the left-right direction) In FIG. 2, a second communication passage 11 is provided which allows the right end portions) to communicate with each other. here The diameter of the first communication passage 9 is set to be relatively large, and the length thereof is set to be relatively short. It is fixed. On the other hand, the diameter of the second communication passage 11 is set to be relatively small, and Is set to be relatively long, and the equivalent path length for pressure wave propagation is relatively long. ing.   Here, the first and second communication passages 9 and 11 are opened and closed respectively in the first and second open passages. Valves 10 and 12 are provided. Then, the opening and closing of both on-off valves 10 and 12 are combined. By switching the propagation path of the pressure wave, as described later, The pressure wave is supercharged according to the engine speed.

[0012]   In order to drive the first on-off valve 10 to open and close, a negative pressure responsive first actuator 13 The first solenoid valve 15 is connected to the first actuator 13. Negative pressure is supplied through the first negative pressure supply passage 14 provided. This Here, the upstream end of the first negative pressure supply passage 14 is connected to the negative pressure chamber 16. This negative pressure In the chamber 16, the negative pressure in the second branch intake passage 7b is transferred to the negative pressure through which the check valve 18 is installed. It is introduced through the inlet passage 17 so that the inside of the negative pressure chamber 16 is always kept at negative pressure. There is.   Further, in order to drive the second on-off valve 12 to open and close, a negative pressure responsive second actuator is provided. A second solenoid valve 2 is provided to the second actuator 19. Negative pressure is supplied through the second negative pressure supply passage 20 in which 1 is provided. It The upstream end of the second negative pressure supply passage 20 is connected to the negative pressure chamber 16 described above. It

[0013]   The first solenoid valve 15 applies negative pressure to the first negative pressure supply passage 14 on the downstream side. It is designed to switch between supplying the negative pressure in the chamber 16 and supplying the atmospheric pressure. It Similarly, the second solenoid valve 21 has a second negative pressure supply passage downstream thereof. It is adapted to switch between supplying negative pressure and supplying atmospheric pressure to 20. The solenoid valves 15 and 21 are connected to the control unit 22, respectively. Therefore, depending on the engine speed detected by the speed sensor 23, the negative pressure is supplied. It can be switched to the supply side or the atmospheric pressure supply side. That is, the controller According to the signal from the roll unit 22, the first and second solenoid valves 15 and 21 And the first and second actuators 13 and 19 change the The second on-off valves 10 and 12 are opened and closed, and the inertia effect or Pressure wave supercharging is performed by the resonance effect. The first and second opening The closing valves 10 and 12 are supplied with negative pressure to the first and second actuators 13 and 19, respectively. When the atmospheric pressure is supplied, it is fully closed while the so-called no This is a closed valve.

[0014]   Here, for example, both the first and second on-off valves 10 and 12 are closed in a predetermined low rotation region. In each of the cylinders # 1 to # 6, the branch parts of the first and second branch intake passages 7a and 7b are connected. The pressure wave is not supercharged by the inertial effect that the pressure reversal part is near the throttle body 6. Be seen. In this case, the propagation path of the pressure wave is long, so the engine speed (low speed) Matched and effective pressure wave supercharging is achieved.   In the predetermined middle rotation range, the first opening / closing valve 10 is closed and the second opening / closing valve 12 is opened. The pressure wave supercharging by the resonance effect is performed using the second communication passage 11 as the resonance passage. Na The equivalent propagation path length of the pressure wave in the second communication passage 11 has a resonance effect in the middle rotation region. Needless to say, the length is set to a predetermined value so that   Further, in a predetermined high rotation region, both the first and second on-off valves 10 and 12 are opened, At this time, the first and second intake collecting portions 8a and 8b substantially function as one volume portion, and each cylinder In # 1 to # 6, the inertia effect is obtained by using the first and second intake collecting portions 8a and 8b as pressure reversing portions. Pressure wave supercharging is performed. In this case, because the propagation path length of the pressure wave is short, The effective supercharging that matches the engine speed (high speed) is performed.

[0015]   By the way, as described above, the negative pressure responsive actuator 13 utilizing the intake negative pressure, 19. As described above, in general, it is generally said that full opening is reached during opening / closing operation. Fluttering will occur when it reaches full or fully closed, but in the first embodiment As will be described below, such flapping is prevented.   Hereinafter, the structure for preventing flapping of the first opening / closing valve 10 will be described with reference to FIG. As will be apparent, the same applies to the second on-off valve 12.   As shown in FIG. 1, the valve body 26 of the on-off valve 10 is attached to the valve shaft 27, and It is adapted to rotate integrally with the valve shaft 27. A lever 28 is attached to the valve shaft 27. Further, the lever 28 is attached to the first actuator via a connecting member 29. It is connected to the tip portion (the right end portion in FIG. 1) of the rod 30 of the eta 13. In the following For convenience, the right direction in FIG. 1 is simply referred to as “right”, and the opposite direction is simply referred to as “left”. U Then, the connecting member 29 causes the rod 30 to move in the left-right direction. It is adapted to be converted into rotational movement (around the axis of the valve shaft 27). The first on-off valve The stopper 37 is provided to position the valve body 26 (lever 28) when the valve 10 is fully closed. It is provided.

[0016]   On the other hand, the case 38 of the first actuator 13 can swell in the left-right direction. A diaphragm 31 is formed, and a rod is provided on the right side of the diaphragm 31. 30 is fixed. The left side of the diaphragm 31 in the case 38 A pressure chamber 33 is formed in the pressure chamber 33, and the first negative pressure supply passage 14 is connected to the pressure chamber 33. There is. A coil spring 32 is arranged in the pressure chamber 33. The pulling 32 always biases the diaphragm 31 rightward.

[0017]   When the first opening / closing valve 10 is opened / closed, when the first closing valve 10 is fully closed or completely closed. As an external urging means for preventing the valve body 26 from fluttering when it reaches the open position, A bias spring 34 is provided. One end of the biasing spring 34 is attached to the rod 30. On a straight line L that is substantially orthogonal to the axis and passes through the axis of the valve shaft 27 (hereinafter, Fixed to a first spring fixing portion 35 arranged at a predetermined position of The end portion is fixed to a second spring fixing portion 36 provided at the tip portion of the rod 30. . The urging spring 34 is always in a compressed state, and the first spring fixing portion 35 and the second spring fixing portion 35 A biasing force for separating these from the spring fixing portion 36 is applied. . Here, the second spring fixing portion 36 is provided at the center when the opening / closing valve 10 is fully opened and fully closed. The lines are arranged so as to be symmetrical with respect to the line L. That is, the first opening and closing When the valve 10 is fully opened and fully closed, the first spring fixing portion 35 and the second spring fixing portion 36 are connected to each other. The angle between the connecting line (that is, the center line of the biasing spring 34) and the center line L is approximately equal. Become equal. Below, for convenience, the first spring fixing portion 3 is viewed in the direction of the center line L. The 5 side is called "bottom" and the second spring fixing portion 36 side is called "top".   It should be noted that the first spring fixing portion 35 is provided for the valve body 26 (lever 2 when the first opening / closing valve 10 is fully opened). It also functions as a stopper for positioning 8).

[0018]   In the above configuration, when the atmospheric pressure is introduced into the pressure chamber 33, the diaphragm 31 is bulged to the right by the urging force of the coil spring 32. The rod 30 moves to the right, and through the connecting member 29 and the lever 28, the valve shaft 27 rotates clockwise, the valve body 26 closes the first communication passage 9, and the first opening / closing valve 10 To be closed. Here, the rod 30 is always urged in a substantially upward direction by the urging spring 34. Although receiving force, rod 30 moves to the right from the intermediate position (center line L position) When this is done, a component component in the right direction is generated in the biasing force.

[0019]   That is, as shown in FIG. 3, when the rod 30 is located on the right side of the intermediate position, To the rod 30, a biasing force F in an obliquely upper right direction acts on the rod 30, and from this biasing force F, An upward component force Fx and an upward component force Fy are generated. Here, the rightward component force Fx is Since it matches the moving direction (rightward) of the head 30, the driving force of the rod 30, that is, the first The opening / closing driving force of the opening / closing valve 10 is assisted. In this case, the rod 30 The rightward component force Fx becomes stronger as it moves, so the first on-off valve 10 reaches the fully closed state. When it is done, the above-mentioned assist power becomes the strongest. Therefore, the first on-off valve 10 is fully closed. When it reaches, the valve body 26 is urged in a clockwise direction by a strong force, and the valve body 26 flaps. Does not occur. In this case, the upward component force Fy urges the rod 30 upward. However, since the rod 30 is firmly supported in this direction, no trouble occurs. Yes. In addition, the component force Fy does not substantially participate in the movement of the rod 30 in the left-right direction. Needless to say, it does not participate in the rotation of the lever 28.   Here, in the state where the first on-off valve 10 is partially opened, And the component force of the urging force in the left-right direction is reduced, which hinders the drive of the first opening / closing valve 10. I can't.

[0020]   On the other hand, when a negative pressure is introduced into the pressure chamber 33, this negative pressure causes the diaphragm The frame 31 is bulged leftward against the urging force of the coil spring 32. As a result, the rod 30 moves leftward, and the valve shaft 27 rotates counterclockwise, contrary to when the valve is closed. Then, the first on-off valve 10 is opened as indicated by the phantom line. Where the rod 30 When is moved to the left of the intermediate position, a leftward component force is generated in the biasing force. That is, as shown in FIG. 3, the biasing force F ′ in the diagonally upper left direction acts on the rod 30. However, from this biasing force F ′, a leftward component force Fx ′ and an upward component force Fy ′ are generated. This Here, since the component force Fx ′ to the left matches the moving direction (left direction) of the rod 30, Assists the driving force of the rod 30 of the vehicle, that is, the driving force of the opening / closing valve 10 in the valve opening direction. To do. In this case, as the rod 30 moves to the left, the component force Fx 'to the left increases. Therefore, when the first opening / closing valve 10 reaches the fully opened state, the assist force is the strongest. Become. Therefore, when the first opening / closing valve 10 reaches full opening, the valve body 26 is forced with a strong force. The valve body 26 is biased counterclockwise and does not flutter. Note that in this case as well The force component Fy ′ of the mushroom does not substantially participate in the opening / closing operation of the first opening / closing valve 10.

[0021]   In the above configuration, the second spring fixing portion 36 is provided at the tip portion of the rod 30, but The double spring fixing portion 36 may be provided on the lever 28. In this case, The second spring fixing portion 36 is provided with the center line L when the first opening / closing valve 10 is fully opened and fully closed. They are arranged so that they are symmetrical to each other. In addition, in this way, the second spring fixing portion When 36 is provided on the lever 28, the urging spring 34 is always in a stretched state. These springs are close to the first spring fixing portion 35 and the second spring fixing portion 36. It is necessary to use a spring that gives a biasing force.   In this case, when the valve is closed, the urging force of the urging spring 34 acts on the lever 28. , The component of this biasing force in the lever rotation direction assists the rotation (clockwise) of the lever 28. Therefore, as in the case described above, the fluttering when the first opening / closing valve 10 reaches the fully closed state Is prevented. A radial component is also generated in the biasing force, but this component is It does not substantially participate in the rotation of the bar 28.   On the other hand, when the valve is opened, the component of the urging force of the urging spring 34 in the rotational direction is applied to the lever 28. Since it assists the rotation (counterclockwise) of the Flapping is prevented.

[0022]   <Second embodiment>   Hereinafter, a second embodiment of the present invention will be described basically with reference to FIG. In order to avoid duplication, the same parts as those in the first embodiment shown in FIGS. Will be omitted and the description will be omitted, and only the points different from the first embodiment will be described.   As shown in FIG. 4, in the second embodiment, when the first on-off valve 10 is closed, the lever 28 ( The stopper for positioning (see FIG. 1) is composed of an electromagnet 41. The lever 28 is attracted by the magnetic force of 1 to prevent the first on-off valve 10 from fluttering. I am sorry. This electromagnet 41 is provided when power is supplied from the power supply unit 42. It is designed to be excited. Here, the power supply unit 42 is a control unit. When the first on-off valve 10 is opened / closed in response to the signal from 22, the electromagnet 41 is turned on. -It is turned off to prevent the flap 26 from fluttering.

[0023]   Hereinafter, according to the flowchart shown in FIG. A control method of opening / closing control of the first opening / closing valve 10 will be described.   At step # 1, the engine speed N and the open / closed state of the first opening / closing valve 10 are read. Get caught.   In step # 2, it is compared and determined whether or not the first opening / closing valve 10 is in the open state. It Here, if the first opening / closing valve 10 is open (YES), in step # 3, N <3000 r.p.m. is compared / determined. That is, at the time of high rotation, the first Although the on-off valve 10 is in the open state and pressure wave supercharging suitable for the high rotation range is performed. , When N <3000r.p.m. Here, the first opening / closing valve 10 is closed and the middle rotation is performed. It is designed to perform pressure wave supercharging suitable for the area. However, switching speed On the contrary, in order to prevent frequent opening and closing of the first opening / closing valve 10 near the first opening / closing valve 10, When the on-off valve 10 is opened from the closed state, when N> 3500 r.p.m. In addition, the first opening / closing valve 10 is opened. In other words, hiss for 500 r.p.m. There is a teresis.

[0024]   If it is determined in step # 3 that N ≧ 3000 r.p.m. (NO), the first opening / closing Since it is not necessary to close the valve 10, the process returns to step # 1.   On the other hand, if it is determined that N <3000r.p.m. In step # 3 (YES), the scan At step # 4, the electromagnet 41 is turned on (excited).   Then, in step # 5, the first solenoid valve 15 is switched to the first solenoid valve 15. Atmospheric pressure is introduced into the pressure chamber 33 of the actuator 13, and the first opening / closing valve 10 is closed. It At this time, since the lever 28 is attracted to the electromagnet 41, the first opening / closing valve 10 is fully closed. When the temperature reaches, the valve body 26 does not flutter. After this, return to step # 1 To do.

[0025]   On the other hand, if it is determined in step # 2 that the first opening / closing valve 10 is closed (NO) , Step # 6 compares and determines whether N> 3500 r.p.m. here If N ≦ 3500 r.p.m. (NO), it is not necessary to open the first on-off valve 10. , Return to step # 1.   On the other hand, if N> 3500 r.p.m. (YES), the electromagnet 41 is turned off in step # 7. It is demagnetized. That is, when the valve is opened, the lever 28 moves the electromagnet 41 (stopper). However, at this time, the electromagnet 41 is turned off so that it can be quickly separated.   Then, in step # 8, the first solenoid valve 15 is switched and the first solenoid valve 15 is switched. Negative pressure is introduced into the pressure chamber 33 of the actuator 13, and the first opening / closing valve 10 is opened. After this, the process returns to step # 1.

[0026]   Although not shown in FIG. 4 or the above flow chart, the first opening / closing valve 10 First spring fixing portion 35 that functions as a stopper for the lever 28 when the valve is opened (see FIG. 1) Is constituted by an electromagnet, which is excited when the first opening / closing valve 10 is opened, and the valve body 2 is opened when the valve is opened. The fluttering of 6 may be prevented.

[0027]

[Operation and effect of the device]

  According to the first invention, the opening / closing valve is fully opened during the valve opening operation or the valve closing operation. Or when the valve is fully closed, the opening / closing valve is opened or closed by the external biasing means. Since it is biased in the valve direction, the flap of the on-off valve can be expanded without increasing the size of the actuator. It is possible to prevent sticking. Therefore, the on-off valve in the dynamic supercharging state of the intake Is maintained, the dynamic effect of intake is enhanced, and the engine output is improved. Planned.

[0028]   According to the second invention, basically, the same operation and effect as those of the first invention can be obtained. Furthermore, when the on-off valve is partially opened, the external biasing means is more effective than when it is fully opened or fully closed. Since the urging force of the valve becomes weak, the opening / closing valve operation during the valve opening operation or valve closing operation To be lubricated.

[0029]   According to the third device, basically, the same action and effect as those of the second device can be obtained. . Furthermore, the on-off valve causes intake pulsation, and therefore the on-off valve flutters. Since it is provided in the communication passage between both intakes of the pan, the above-mentioned flapping prevention effect can be achieved. Will be effective.

[0030]   According to the fourth invention, basically, the same operation and effect as those of the second or third invention. Is obtained. In addition, the on-off valve is normally closed, The on-off valve is closed when atmospheric pressure is introduced to the motor, and The opening / closing valve driving force is not affected by the fluctuation of the intake negative pressure. On the other hand, the flap of the on-off valve Since the movement is stronger when the valve is closed than when it is opened, the flap of the open / close valve is reduced. Layers can be effectively prevented.

[Brief description of drawings]

1 is a partial cross-sectional plan view of a first opening / closing valve of the intake device shown in FIG. 2 and a first actuator for opening / closing the same.

FIG. 2 is a system configuration diagram of a V-type 6-cylinder engine including an intake device according to the present invention, showing a first embodiment.

FIG. 3 is a diagram showing a biasing force applied to a rod when the first on-off valve shown in FIG. 1 is fully opened or fully closed.

FIG. 4 is a system configuration diagram of a V-type 6-cylinder engine having an intake device according to the present invention, showing a second embodiment.

5 is a flowchart showing a control method of opening / closing control of a first opening / closing valve of the intake device shown in FIG.

[Explanation of symbols]

VE ... engine Q ... Intake device A: First bank B: Second bank 7a ... First branch intake passage 7b ... Second branch intake passage 8a ... 1st intake collecting part 8b ... second intake collecting section 9 ... First communication passage 10 ... First on-off valve 11 ... Second communication passage 12 ... Second on-off valve 13 ... First actuator 19 ... Second actuator 34 ... Energizing spring 41 ... Electromagnet

Claims (4)

[Scope of utility model registration request] 1. An intake device for an engine, comprising: an opening / closing valve for changing a state of an intake passage; and an actuator for opening / closing the opening / closing valve according to whether negative pressure is introduced or not. An intake device for an engine, comprising: external biasing means for assisting the opening / closing driving force of the actuator when the opening / closing valve reaches at least one of fully closed and fully opened. 2. The engine intake system according to claim 1, wherein the external urging means operates when the on-off valve is in a fully open state or a fully closed state, rather than when the on-off valve is partially opened. The intake device for the engine is also characterized in that the urging force is also increased. 3. The intake system for an engine according to claim 2, wherein an intake air supply system to the engine is divided into a first and a second branch intake air supply system, and each of the branch intake air supply systems receives an intake air. An intake device for an engine, comprising: a collecting portion, a communication passage that connects the intake collecting portions to each other, and an opening / closing valve that opens and closes the communication passage. 4. The engine intake system according to claim 2 or 3, wherein the on-off valve is a normally closed type that is fully opened when a negative pressure is introduced into the actuator. Intake device.