JPH02181069A - Control valve device for idling speed of internal combustion engine - Google Patents

Abstract

PURPOSE:To improve accuracy of control by providing a step motor comprising a rotor made of a permanent magnet and a coil, a movable stopper regulating a range of rotational movement of the rotor, and a stopper obstructing rotational movement, and instituting a function of position between the magnetic pole of the rotor and the movable stopper into a prescribed angle. CONSTITUTION:A duct 3 by-passing a throttle valve 2 is provided on an intake passage 1, and an idling speed control valve 4 of which a housing 5 receives a sleeve 6, a valve 7, and a step motor 8, is provided on the middle part of the duct. The valve 7 is formed into a cylindrical shape and its end face is formed into an inclined face 7a. Further, the step motor 8 is constituted so that stators 15,25 and a coil 16 are concentrically provided and additionally a rotor 19 in one body with a rotating shaft 14 is provided in the center, and a projecting movable stopper 21a is formed on the end face of the sleeve 6 side of a mold 21 of the rotor 19. The rotationally moving range of the rotor 19 is regulated by engagement of the movable stopper 21a with a stopper 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an idling speed control valve device for an internal combustion engine that controls the flow rate of a bypass passage provided in an intake passage of the internal combustion engine.

[Conventional technology]

Conventionally, as an idling speed control pulp charge for this building, there has been one shown in, for example, Japanese Patent Publication No. 61-57935. FIG. 12 shows such an idling speed control valve device, in which a step motor (31) is held in a motor housing (32), and the motor housing (32) is connected to a motor housing end plate (33), a valve housing ( 34) and bolts (35)K. Valve housing (34)K is flange (34a)
are integrally formed, and a valve chamber (36) is formed in the valve housing (34), and the valve chamber (36) K has an intake air outlet (36a) on its vertical side wall and a horizontal Intake air outlets (36b) are provided on the lower wall surface so as to communicate with the bypass passages. Bypass'I (3
7) forms a bypass passage. Outlet (36a)
K is fitted with a valve seat (38).

On the other hand, the step motor (31) includes a rotor (40) disposed coaxially with the valve shaft (39), and a pair of rotors fixedly disposed at a small distance from the cylindrical outer peripheral surface of the rotor (40). stators (41) and (42). Benri (3)
9) is arranged horizontally so that engine vibrations are not applied in the axial direction of the valve shaft (3t), and the central part jC of the valve chamber (36)
C exit is installed. Further, the end portion of the valve shaft (39) is supported by a bearing (4:lK), and the intermediate portion is supported by a bearing (44).
) is in the maximum forward position, the first stop pin (45) contacts the rotor (40), and the second stop pin (41) contacts the rotor (41) when the valve M (39') is in the maximum retraction position. (46) is fixed. Valve stem (39YK
is screwed with an external thread (47), and this external thread (47)
A flat portion (4B) extending from near the termination point r toward the outlet (36a) is formed, and this flat portion (48) and the bearing (4B) are formed.
4), the valve shaft (39) is supported so as to be non-rotatable and slidable in the axial direction. A valve body (50) having a substantially conical outer circumferential surface (49) is fixed to the tip of the valve stem (39) with a hollow (51) K, and the outer circumferential surface (49) of the valve body (5(+)) An annular outlet is formed between the valve body (36) and the valve seat (38).A compression spring (52) is also provided in the valve chamber (36) between the valve body (59) and the housing end plate (33). It's been a long time.

The rotor (40) includes an inner cylinder (53), an intermediate cylinder (54) fitted and fixed to the cylinder (53), and an outer cylinder consisting of a permanent magnet fixed on the outer peripheral surface of the intermediate cylinder (54). (55) and (l
・'Yotsu' CM formation τ・Re, this water-filled stone outer cylinder (55)
The solidification direction of K is V, and north and south poles are formed alternately. In addition, the internal thread of the center hole of the inner station < S 3) is formed with the same thread (56) that screws with the outer thread (47), and the valve shaft (39) is rotated in the axial direction by the rotation tζ of the rotor (40). It is supposed to move.

In the idling speed control valve island constructed as described above, when one K control pulse is applied to the stator (41) (42), the rotor outer cylinder (5F+)
') (4:l), thereby moving the rotor (4:l).
0) rotates. When the rotor (4o) rotates, the valve shaft (
Since the outer thread (47) of the rotor (39) and the inner thread (56) of the rotor inner cylinder (53) are screwed together, the valve shaft (39) moves back and forth. As a result, the valve body (50) and valve seat (38
) The cross-sectional area of the outlet formed between the bypass passages is increased or decreased, and the air flow rate of the bypass passage is controlled.

[Problem to be solved by the invention]

As mentioned above, in the conventional idling speed control valve device for an internal combustion engine, the stopper is provided on the valve shaft, which is the first and second stop pins that come into contact with the rotor, and generally the stopper surface of the rotor and , the rotor's magnetic poles were manufactured at arbitrary angles. Therefore, if a drive signal is input after the rotor contacts the stopper and rotation is prevented,
The rotor does not necessarily stop at the position where it touches the stopper,
Also, even if a drive signal in the opposite direction to the above is input, it will always come to a stopped state after rotating by one pulse with the first drive signal.
The rotation angle of the rotor may change by more than one pulse, and the rotation angle of the rotor changes by several pulses of the drive signal, which causes a change in the pulp opening and a problem in that the accuracy of the air flow rate deteriorates.

This invention was made to solve the above problem, and is an idling system for an internal combustion engine in which the next drive signal is limited so that the rotor always rotates by one pulse from the first signal even in the case of reverse rotation. The purpose is to obtain a rotation speed control valve device.

[Means to solve the problem]

The idling speed control valve device for an internal combustion engine according to the present invention includes a stepping motor including a rotor made of a permanent magnet and a coil device for rotating the rotor, a movable stopper and a rotation prevention stopper for regulating the rotation range of the rotor. , and the positional relationship between the magnetic poles of the rotor and the movable stopper is set at a predetermined angle.

[For production]

In this fJJ4, the magnetic movement of the rotor and the mutual positional relationship of the movable stopper are manufactured in accordance with a predetermined angle, so that the drive signal when the movable stopper and the rotation prevention stopper come into contact is always determined. . During reverse rotation, by switching the drive signal, the rotor rotates at an angle corresponding to the number of drive signals.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 11. FIG. 2 shows an intake system using an idling speed control valve device for an internal combustion engine according to an embodiment of the present invention. In the figure, a throttle valve (2) is disposed in an intake passage (1) of the internal combustion engine. ing. In addition, the intake passage (1
) Throttle valve (2) There is a bypass pipe (3) on the upstream side.
One end of the bypass pipe (3) is open, and the other end of the bypass pipe (3) is open on the downstream side. An idling speed control valve (4) is provided in the middle of the bypass line (3), and its details will be explained with reference to FIGS. 1 and 3 to 10.

In FIGS. 2 and 3, the housing (5) houses a sleeve (6), a valve (7) and a step motor (8). The inflow passageway (9) and the outflow passageway (1(1)K) formed in the housing (5) correspond to the inflow port (11) and the outflow port (12) provided in the sleeve (6), respectively.
) are connected. Further, the sleeve (6) is integrally fitted and fixed to the housing (5), and a metal (13) serving as a bearing provided at the center of the side surface is attached to one end of the rotating shaft (14) of the valve (7). It supports the side and positions the valve (7) in the axial direction. moreover,
A convex stopper (6a) as a fixed locking part is formed on the side surface of the sleeve (6), and a step motor (to be described later)
8) is adapted to engage with a stopper formed on the rotor. The valve (7) has a cylindrical shape with a rotating shaft (4) fixed integrally thereto, and its end faces are inclined surfaces (7a) (7b).
(as shown in FIGS. 1 and 4), and is arranged to rotate with a minute gap between it and the inner circumferential surface of the sleeve (6). The step motor (8) is the valve (7)
It functions as a rotational drive means for the stator (
15) (25), a coil white 6) is fixed concentrically to the housing (5).

The cover (17) K, which is fitted and fixed to the housing (5), has a metal white 8) in its center, and a rotating shaft (14).
) is supported on the other end side. The rotor (19) of the step motor (8) has a magnet (2o), a mold (21
) and a rotating shaft (14), these are integrally formed, and the rotating shaft (14) is made of metal (13) as described above.
(21>). Also, a convex movable stopper (21a) is provided on the side end surface of the sleeve (6) of the malt (21).
is formed and engages with the stopper (6a) to rotate the rotor (19).
) is designed to define the rotation range of the mold(
There is a spring (22) between the sleeve (6) and the sleeve (21).
is provided to bias the rotor (19) in one direction to eliminate play, and to press the valve (7) against the metal (13)K. Further, a seal (23) is interposed between the cover (17) and the housing (5). The coil lead (24) of the coil (16) is connected to the terminal (26'1).

In FIG. 5, alignment grooves (17a) are provided in some of the three kite protrusions (17b) that are integral with the cover (17).

In Figure 6, the movable stopper (21a) provided on the mold (21) is shown when fully closed, and when fully opened (218').
The position will be

7 and 8 show the relationship between the movable stopper (21a) and the magnetic poles of the magnet (20).

Figures 9 and 10 show details of the stators (15) (25), which include magnetic pole pieces (15a) (25).
a) and alignment protrusions (15b) and (25b) are formed, respectively, and the angular relationship between the protrusion (15b) and the magnetic pole piece (15a), and between the protrusion (25b) and the magnetic pole piece (25a) is set to a predetermined value. . In addition, the protrusion (15b) (25b
) is fitted into the groove (17a"l) of the cover (17), and the cover (17) and the housing (5) are connected to each other.
The angular relationship between the /l/do (21) and the stopper (6a) is set to a predetermined angle. On the other hand, as shown in FIGS. 7 and 8, on the rotor (19) side, the magnetic pole of the magnet (20) is set at a predetermined angle with respect to the stopper (21a).

According to the above-mentioned arrangement, the step motor (8) rotates the rotor (19) in the forward direction or the reverse direction by switching the connection of the stator to the coil (16), as in the conventional device. Now, when the rotor (19) is moved in the forward direction KMA and the valve (7) is rotated by a predetermined angle from the fully closed position of the outlet (12), the outlet (12) and the inclined surface (7a) are rotated by a predetermined angle as shown in FIG. ) changes, and the opening area of the outlet (12) changes depending on the rotation angle of the valve (7).

and the valve (if the force turns further, the outlet (12)
The end face located at is an inclined face (7b), the opening area increases, and the air flow rate of the bypass pipe (3) increases. Note that the inlet (1) is connected to the valve (7) so that it is always in communication with the inside of the sleeve (6) even when the valve (7) is rotated.
slopes (7a) and (7b) are formed, and the flow rate is controlled by opening and closing the outlet (12).

Further, the angle of inclination of the inclined surface (7b) with respect to the circumferential direction of the bulb (7) is larger than the angle of the inclined surface (7a).

That is, the flow control amount relative to the rotation of the valve (7) is set to be small in the low opening range, and large in the high opening range. Therefore, minute flow control is possible in the low opening range, and responsiveness of flow control in the high opening range is improved.

On the other hand, when the step motor (8) reverses, the valve (7)
rotates in the opposite direction to reduce the opening area of the outlet (12), and by repeating this operation, the air flow rate of the bypass pipe (3) is controlled according to a predetermined idling speed. .

Further, in the above flow rate control, the rotation range of the valve (7) is defined by the engagement of the rotation prevention stopper (6a) and the movable stopper (21a), as shown in FIG. That is, one contact side of these stoppers (6a) (21a) corresponds to the position of the valve (7) when it is fully closed, and the other contact side corresponds to the position of the valve (position #) when it is fully open.
The positional relationship between the valve (7) and the sleeve (6) has been determined. Therefore, for example, the coil of the step motor (8) (
If the operation command to 16) is outside the rotation range of the kahalub (7), the rotor (19) will rotate and the movable stopper (21a) will come into contact with the rotation prevention stopper (sa) KW, and no further movement will be possible. rotation is prevented. At this point, the torque generated by the step motor (8) is reduced to both stoppers (6a) (12a).
), no excessive force is applied to the fixed portions of the mold (21) and the rotating shaft (14) and the fixed portions of the rotating shaft (14) and the valve (7).

Furthermore, the characteristic operation of the above embodiment will be explained with reference to FIG. Coil white 6) is w, x, y.

It consists of 204 coils, and each coil can be individually excited. Now, when the coil W is excited, W, X
The coil side magnetic pole pieces (15a) (25a) become N and S in the figure, and when the coil X is excited, the state becomes ■.

■ Become. Also, when the coil Y is excited, the Y and Z coil side stirrup pole pieces (15a) and (25a'r become N and S,
When the coil 2 is excited, ■ and ■ appear. Coil W.

X, Y, and Z are excited in a predetermined order (thereby, the rotor (19) rotates).

Drive signal (A) → (When the force is sequentially excited, the valve (7) moves in the opening direction. When the drive signal (A) is excited in the order of (A), the valve (7) moves in the closing direction. Drive signal (A) When , the coil 2 is excited and the magnet at the movable stopper (21a) position piece (1
Stop at the intersection of 5a). Next, when the drive signal (b) moves to K, the coils z and X are excited, and each magnetic pole piece (15a
), the pole (2) of the magnet (20) moves to the intersection of the center of each magnetic pole piece and the drive signal (b). Similarly, move the ■ pole of the magnet (20), and use the drive signal (movable stopper (21a) of the magnet (20) at ■ position).
comes into contact with the rotation prevention stopper (6a), and rotation of the rotor (19) is prevented. As mentioned above, the movable stopper (21a
) and the magnetic poles of the rotor (19) at a predetermined angle Kf.
By keeping the stopper (6a) (21a)
The drive signal at the time of contact with the stopper is determined, and the drive signal after contact with the stopper is set to (male) in the above embodiment. Next K, at the time of reverse rotation,
By sequentially switching the drive signals (G), (F), (E), etc., the rotor (19) sequentially rotates at an angle corresponding to the number of drive signals, and accurately adjusts the air flow rate. will be controlled.

In addition, the drive signal is sequentially input to the (male → (A) side), and the valve (
The movable stopper (2) also closes the outlet (12) when the stopper (7) closes the outlet (12).
1a) becomes the position (21a') in Fig. 6, and the stopper (
6a), and the drive signal at this time also becomes a predetermined signal.

〔Effect of the invention〕

As is clear from the above description, this invention provides a drive signal when the rotation of the rotor is blocked by the stopper by creating a predetermined angular relationship between the movable stopper on the rotor side and the magnetic poles of the rotor. Since the rotor can be limited, the next drive signal can be limited even when rotating in the reverse direction, and the rotor always rotates by one pulse from the first signal. In this way, the valve opening moves faithfully following the input drive signal, improving air flow rate control accuracy.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of an embodiment of the present invention, FIG. 2 is a schematic side sectional view of an internal combustion engine intake system to which the embodiment is applied, and FIG.
The figure is a cross-sectional view taken along the line III-m in Figure 1, and Figure 4.
The figure is a developed view for explaining the operation of the valve part in Figure 3, Figure 5 is a cross-sectional view taken along the line V-V in Figure 1,
Fig. 6 is a cross-sectional view taken along the VT-VT line in Fig. 1, Fig. 7 is a partial side view of the one in Fig. 1, Fig. 8 is a front view of the one in Fig. 10 is a perspective view of a stator paired with the stator in FIG. 9, FIG. 11 is an explanatory diagram of the operation of the embodiment, and FIG.
The figure is a side sectional view of a conventional idling speed control valve device for an internal combustion engine. (1)...Intake passage, (2)...Throttle valve, (3)
...Bypass pipe line, (4)...Idling speed control pulse, (7)...Valve, (81...Step motor, (6a)...Rotation prevention stopper (15) (2])...
・Stator, (16)...Coil, (17)@・Cover=
(19)...Rotor, (20)...Permanent magnet, (21a
)...Movable stopper. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] An idling device for an internal combustion engine, which is disposed in a bypass passage that bypasses a throttle valve provided in an intake passage of the internal combustion engine, and controls the amount of intake air flowing through the bypass passage to control the idling rotation speed. A rotation speed control valve device comprising: a rotor made of a permanent magnet; a step motor made of a coil that rotates the rotor; and a movable stopper and a rotation prevention stopper that restrict a rotation range of the rotor. An idling rotation speed control valve device for an internal combustion engine, characterized in that a positional relationship between the magnetic pole and the movable stopper is set at a predetermined angle.