JP2007192174A - Intake control device for engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance durability and the degree of selection freedom of an actuator which drives an impulse valve comprising a ball valve for opening/closing an intake passage of an engine. <P>SOLUTION: In this intake control device, a valve body 42 of the impulse valve 32 has two first seal faces 46a. Since the valve body 42 is intermittently rotated in one direction by an actuator 55 to alternately seat the two first seal faces 46a on a second seal face 51a of a seat ring 51, a degree of selection freedom of the actuator 55 and durability can be enhanced, compared with a case where a valve body is reciprocated and rotated by a reciprocating rotation type actuator. In addition, although the valve body 42 has the two first seal faces 46a, the seat ring 51 has the one second seal face 51a. Therefore, when any one of the first seal faces 46a is seated on the second seal face 51a, variation of supercharging effects can be avoided by preventing change of the volume of the intake passage in the downstream side from the second seal face 51a on which the one first seal face 46a is seated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes a valve body having an annular first seal surface formed of a part of a spherical surface and rotatably supported by a rotating shaft, and the first seal surface of the valve body is slidable and seatable. An impulse valve comprising: an annular second seal surface; a seat ring having an opening penetrating through a center of the second seal surface; and an actuator that drives the valve body to rotate about the rotation axis, the first seal surface The present invention relates to an engine intake control device in which an intake passage of an engine is closed when seated on the second seal surface.

An impulse valve made up of a ball valve arranged in the intake passage of the engine is opened and closed at a predetermined timing in synchronization with the opening and closing of the intake valve by an actuator made up of a rotary solenoid or an electric motor. Japanese Patent Application Laid-Open Publication No. 2004-151867 discloses that an intake air pulsation is generated to obtain a supercharging effect.
JP 2005-344803 A

  By the way, what is described in the above-mentioned patent document 1 is that the valve body is reciprocally rotated by 90 degrees through an actuator, so that the annular first seal surface of the valve body is seated on the annular second seal surface of the seat ring. Thus, a fully closed state in which the intake passage is closed and a fully open state in which the annular opening of the valve body overlaps the annular opening of the seat ring to open the intake passage are switched. Therefore, a reciprocating rotation type actuator having a predetermined rotation angle is required, and not only the degree of freedom of selection becomes small, but also the durability of the actuator is adversely affected because it repeats normal rotation and reverse rotation at short time intervals. May come out.

  The present invention has been made in view of the above circumstances, and an object thereof is to increase the degree of freedom and durability of selection of an actuator that drives an impulse valve including a ball valve that opens and closes an intake passage of an engine.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a valve body having an annular first sealing surface formed of a part of a spherical surface and rotatably supported by a rotating shaft. A seat ring having an annular second seal surface on which the first seal surface of the valve body is slidable and seatable, and an opening penetrating the center of the second seal surface, and the valve body is rotated about the rotation axis In an intake control device for an engine, the first seal surface of the valve body is provided with an impulse valve including an actuator to be driven, and the intake passage of the engine is closed when the first seal surface is seated on the second seal surface. Are provided on both sides of the rotating shaft, and the two first seal surfaces are moved to the second by intermittently rotating the valve body in one direction by the actuator. Intake control device for an engine, characterized in that for seating alternately Lumpur surface is proposed.

  The second intake passage 41a in the embodiment corresponds to the intake passage of the present invention.

  According to the configuration of the first aspect, the valve body of the impulse valve includes the two first seal surfaces formed so as to sandwich the rotating shaft thereof, and the valve body is intermittently rotated in one direction by the actuator. The engine intake passage is opened and closed by alternately seating the first seal surfaces on the second seal surface of the seat ring. Therefore, the valve body is reciprocally rotated by a reciprocating rotary actuator to open and close the engine intake passage. Compared to the case, the degree of freedom in selecting the actuator and the durability can be increased. Even if the valve body has two first seal surfaces, the number of the second seal surfaces of the seat ring on which the first seal surfaces are seated is one, so that the two first seal surfaces Whichever is seated on the second seal surface, the volume of the intake passage downstream from the second seal surface on which the first seal surface is seated does not change, thereby avoiding variations in the supercharging effect.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 7 show an embodiment of the present invention. FIG. 1 is a sectional view of a cylinder head portion and an impulse valve of an engine, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. FIG. 4, FIG. 4 is an explanatory diagram of the action corresponding to the four-direction arrow view of FIG. 2, FIG. 5 is a flowchart of the opening / closing control of the impulse valve, and FIG. 6 is the relationship between the engine speed and intake negative pressure and the opening / closing timing of the impulse valve. FIG. 7 is a graph showing the relationship between the crank angle and the opening / closing timing of the impulse valve.

  As shown in FIG. 1, a piston 13 is slidably fitted to a cylinder sleeve 12 provided in a cylinder block 11 of the engine E, and a cylinder head 14 coupled to a deck surface of the cylinder block 11 and a piston 13 are connected to each other. A combustion chamber 15 is defined between the top surface and the top surface. An intake port 16 and an exhaust port 17 connected to the combustion chamber 15 are formed in the cylinder head 14. An intake valve hole that opens the intake port 16 to the combustion chamber 15 is opened and closed by an intake valve 18, and the exhaust port 17 is opened to the combustion chamber. The exhaust valve hole opened to 15 is opened and closed by the exhaust valve 19. The intake valve 18 and the exhaust valve 19 are urged in the valve closing direction by valve springs 20 and 21, respectively.

  An intake camshaft 23 and an intake rocker arm shaft 24 are provided inside a head cover 22 coupled to the upper surface of the cylinder head 14, and are pivotally supported on the intake rocker arm shaft 24 by an intake cam 25 provided on the intake camshaft 23. The intake valve 18 is driven to open and close through the intake rocker arm 26. Further, an exhaust camshaft 27 and an exhaust rocker arm shaft 28 are provided inside the head cover 22, and an exhaust cam 29 provided on the exhaust camshaft 27 via an exhaust rocker arm 30 pivotally supported on the exhaust rocker arm shaft 28. The exhaust valve 19 is driven to open and close.

  An intake passage member 31 connected to the intake port 16, an impulse valve 32 made up of a ball valve, and an intake pipe 33 are connected to the cylinder head 14. A surge tank and a throttle valve (not shown) are connected upstream of the intake pipe 33. Be placed. The intake passage member 31 is provided with a fuel injection valve 34 that injects fuel into the intake port 16.

  Next, the structure of the impulse valve 32 will be described with reference to FIGS.

  The impulse valve 32 includes a valve housing 41 sandwiched between the intake passage member 31 and the intake pipe 33, and a first intake passage 33 a formed in the intake pipe 33 and a second intake passage 41 a formed in the valve housing 41. And the third intake passage 31a formed in the intake passage member 31 are connected in series.

  The valve body 42 housed inside the valve housing 41 is provided integrally with the cylindrical portion 43, a short cylindrical cylindrical portion 43, a pair of rotating shafts 44 and 45 extending in a direction away from the cylindrical portion 43, and the cylindrical portion 43. Thin disk-shaped first and second disk portions 46A and 46B. An opening 43a having a circular cross section passes through the cylindrical portion 43, and two annular first seal surfaces constituting a part of a common spherical surface are provided on the outer periphery of the first and second disc portions 46A and 46B. 46a and 46a are formed.

  The pair of rotating shafts 44 and 45 are disposed on an axis L2 orthogonal to the axis L1 of the second intake passage 41a. One rotating shaft 44 is rotatably supported by the valve housing 41 via a ball bearing 47, The other rotary shaft 45 is rotatably supported by the valve housing 41 via a ball bearing 48 and a seal member 49.

  An annular seat ring 51 is attached to a step portion 41 b formed at the downstream end of the valve housing 41 coupled to the intake passage member 31. The seat ring 51 includes a partially spherical and annular second seal surface 51a on which the first seal surface 46a of the valve body 42 can slide and seat, and an opening having a circular cross section that penetrates the inner periphery of the second seal surface 51a. 51b. The valve housing 41 is integrally formed with an annular regulating member 41c that can abut on the upstream end surface of the seat ring 51.

  An O-ring 52 is attached to an annular groove formed so as to surround the third intake passage 31 a at the upstream end of the intake passage member 31, and the seat ring 51 is directed toward the valve body 42 by the urging force of the O-ring 52. Be energized. An O-ring 53 is mounted in an annular groove formed on the outer periphery of the seat ring 51, and the seat ring 51 is slidably brought into contact with the step portion 41 b of the valve housing 41 via the O-ring 53.

  A driven gear 54 is fixed to the tip of a rotary shaft 45 that penetrates the seal member 49 and protrudes to the outside of the valve housing 41, and a drive provided on an output shaft 55 a of an actuator 55 formed of a step motor fixed to the valve housing 41. A gear 56 meshes with the driven gear 54.

  Next, the operation of the embodiment having the above configuration will be described.

  In the flowchart of FIG. 5, the engine speed Ne and the throttle opening degree Th are read in step S1, the engine speed Ne is equal to or higher than the lower limit value in step S2, the engine speed Ne is equal to or lower than the upper limit value in step S3, step If the throttle opening Th is equal to or greater than the set value in S4, the opening timing and closing timing of the impulse valve 32 are determined from the engine speed Ne and the throttle opening Th in step S5, and the drive signal for the impulse valve 32 is determined in step S6. Is output.

  As shown in FIG. 6, the impulse valve 32 is controlled to open at the middle of the intake stroke and to close at the beginning of the compression stroke so that the intake charging efficiency is maximized. As the engine speed increases, the valve opening timing is gradually advanced and the valve closing timing is gradually retarded. Further, as the intake negative pressure increases, the valve opening timing gradually advances and the valve closing timing gradually retards. At that time, the limit on the advance side of the valve opening timing is determined according to the intake negative pressure, and the limit on the retard side of the valve closing timing is determined according to the valve opening timing of the intake valve 18.

  As shown in FIG. 7, in the first half of the intake stroke, the piston 13 descends while the intake valve 18 is open, so that the second intake passage 41a and the third intake passage 31a downstream of the closed impulse valve 32 are opened. A large negative pressure is generated. When the impulse valve 32 is opened in the middle of the intake stroke, in the latter half of the subsequent intake stroke, the negative pressure causes the first intake passage 33a and the second intake passage 41a upstream from the impulse valve 32 to the combustion chamber 15. Intake flows at high speed.

  The negative pressure wave generated at that time is transmitted to the upstream side of the intake passage and reflected to the surge tank, and the reflected wave is transmitted to the combustion chamber 15 to close the impulse valve 32 at the peak of the positive pressure generated. , The charging efficiency of intake can be greatly increased. When the intake valve 18 is closed, positive pressure is confined in a space defined between the intake valve 18 and the closed impulse valve 32. Accordingly, the combustion chamber 15 can be scavenged with a positive pressure confined in the space during the valve overlap period in which the end of the valve opening period of the next exhaust valve 19 overlaps the initial period of the valve opening period of the intake valve 18. .

  In the state shown in FIG. 4A, the axis L3 of the first and second disc portions 46A and 46B of the valve body 42 of the impulse valve 32 coincides with the axis L1 of the second intake passage 41a, and the cylindrical portion 43 As a result, the first seal surface 46a of the first disc portion 46A is seated on the second seal surface 51a of the seat ring 51, and the second intake passage 41a is closed by the first disc portion 46A. Thus, the impulse valve 32 is closed.

  From this state, as shown in FIG. 4B, when the valve body 42 is rotated 90 ° in the direction of arrow A by the actuator 55 via the drive gear 56 and the driven gear 54, the axis L1 of the second intake passage 41a is obtained. On the other hand, the axis L3 of the first and second disc portions 46A and 46B is orthogonal to each other, and the axis L4 of the cylindrical portion 43 is coincident, so that the first seal surfaces 46a and 46a of the first and second disc portions 46A and 46B, 46A is separated from the second seal surface 51a of the seat ring 51, the second intake passage 41a is opened, and the impulse valve 32 is opened. In the open state of the impulse valve 32, the two disk portions 46A and 46B of the valve body 42 are both retracted to the side of the second intake passage 41a. 46B is avoided.

  From this state, as shown in FIG. 4C, when the valve body 42 is rotated 90 ° in the direction of arrow A by the actuator 55 via the drive gear 56 and the driven gear 54, the axis L1 of the second intake passage 41a is obtained. On the other hand, the axis L3 of the first and second disc portions 46A and 46B of the valve body 42 of the impulse valve 32 coincide with each other, and the axis L4 of the cylindrical portion 43 is orthogonal, whereby the first seal of the second disc portion 46B. The surface 46a is seated on the second seal surface 51a of the seat ring 51, the second intake passage 41a is closed by the second disc portion 46B, and the impulse valve 32 is closed again.

  The valve body 42 is rotated 180 ° between the state of FIG. 4A and the state of FIG. 4C, and the positional relationship between the first disc portion 46A and the second disc portion 46B is changed. However, there is no difference in the closed state of the impulse valve 32. Therefore, by intermittently rotating the valve body 42 in one direction by 90 ° by the actuator 55, the valve opening state and the valve closing state of the impulse valve 32 can be switched alternately. Of course, there are two states in which the positional relationship between the first disc portion 46A and the second disc portion 46B is interchanged by 180 ° in the open state of the impulse valve 32, but there is a functional difference between them. There is no.

  As described above, the valve body 42 of the impulse valve 32 is intermittently rotated in one direction by the actuator 55 so that the two first seal surfaces 46 a and 46 a are seated alternately on the one second seal surface 51 a of the seat ring 51. Therefore, the degree of freedom in selecting the actuator and the durability can be improved as compared with the case where the valve body is reciprocally rotated by a reciprocating rotation type actuator.

  Further, even when the valve body having one first seal surface described in Patent Document 1 is adopted, if the second seal surfaces are provided on the upstream side and the downstream side of the valve body, the valve body is an actuator. Thus, the impulse valve can be opened and closed by intermittently rotating in one direction. However, in this case, when the first seal surface of the valve body is seated on the second seal surface on the upstream side, and when the first seal surface of the valve body is seated on the second seal surface on the downstream side, There is a possibility that the supercharging effect may vary due to a change in the volume of the intake passage on the downstream side of the second seal surface on which the first seal surface is seated.

  On the other hand, according to the present embodiment, even if the valve body 42 includes two first seal surfaces 46a and 46a, the first ring 51 of the seat ring 51 on which the two first seal surfaces 46a and 46a are seated. Since the number of the two seal surfaces 51a is one, the second seal surface on which the first seal surfaces 46a and 46a are seated regardless of which of the two first seal surfaces 46a and 46a is seated on the second seal surface 51a. Variations in the supercharging effect can be avoided by preventing the volume of the intake passage on the downstream side of 51a from changing.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the valve body 42 of the impulse valve 32 is intermittently rotated by 90 °, but the valve body 42 is moved between the valve closing position in FIG. 4A and the valve closing position in FIG. It may be rotated intermittently by 180 °. In this case, the period during which the valve body 42 rotates 180 ° is the valve opening period of the impulse valve 32.

Cross section of engine cylinder head and impulse valve 1 is an enlarged view of the main part of FIG. Perspective view of valve body Action explanatory drawing corresponding to the four direction arrow view of FIG. Flow chart of impulse valve open / close control A graph showing the relationship between engine speed, intake negative pressure, and impulse valve opening / closing timing Graph showing the relationship between crank angle and impulse valve opening / closing timing

Explanation of symbols

E Engine 32 Impulse valve 41a Second intake passage (intake passage)
42 Valve body 44 Rotating shaft 45 Rotating shaft 46a First seal surface 51 Seat ring 51a Second seal surface 51b Opening 55 Actuator

Claims (1)

A valve body (42) having an annular first sealing surface (46a) formed of a part of a spherical surface and rotatably supported by rotating shafts (44, 45);
The first seal surface (46a) of the valve body (42) has an annular second seal surface (51a) capable of sliding and seating and an opening (51b) penetrating through the center of the second seal surface (51a). A seat ring (51);
An impulse valve (32) comprising an actuator (55) for rotationally driving the valve body (42) around the rotation shaft (44, 45);
In an intake control device for an engine, the intake passage (41a) of the engine (E) is closed when the first seal surface (46a) is seated on the second seal surface (51a). Two seal surfaces (46a) are provided across the rotating shafts (44, 45), and the valve body (42) is intermittently rotated in one direction by the actuator (55). An intake control device for an engine, wherein the first seal surface (46a) is alternately seated on the second seal surface (51a).

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