JPH07337050A - Temperature sensitive actuator and idle speed controller - Google Patents

Abstract

PURPOSE:To perform control depending on the temperature without any independent temperature detection elements by disposing a magnetic temperature- sensitive member, having temperature dependent magnetic characteristics, at a part of a magnetic circuit CONSTITUTION:When a thermoferrite is employed as a magnetic temperature- sensitive member 14, lines of magnetic flux A normally flows from N pole of a magnet forming a rotor 13 through pole pieces 11-1, 11-2 to a yoke 10 (as shown by solid lines) thence returns through pole pieces 11-3, 11-4 back to S pole. When the temperature rises, the permeability of the pole pieces 11-1, 11-4 (magnetic temperature-sensitive member 14) decreases to weaken the lines of magnetic flux passing through the pole pieces 11-1, 11-4 and to strengthen the lines of magnetic flux on the side of pole pieces 11-2, 11-3 (dot line). Consequently, the magnet (rotor) 13 rotates counter-clockwise about a shaft 12. When the shaft 12 rotates in the direction for closing the valve, the valve can be closed as the temperature rises. This structure realizes control depending on the temperature without any independent temperature detection element.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature-sensitive actuator that detects a change in temperature of an environment or a specific device and generates a driving force, and an idle speed controller using the same.

[0002]

2. Description of the Related Art There are various cases in which it is desired to change the response condition of a given device in response to changes in the environment or the temperature of the device.
For example, this is the control of the intake air amount in the idling operation state of the automobile. As a conventional device of this kind,
For example, the one using wax as the temperature detection actuating element,
Alternatively, a number of methods have been already proposed, such as a method using a bimetal, and a method in which a temperature detecting element is attached to a required portion and a detection signal from each temperature detecting element is collected to perform predetermined control.

[0003]

The conventional device in the above system has the following inconveniences. For example, when the vehicle is idling, the intake air amount is also affected by the engine temperature. That is, if the engine temperature is high, it is necessary to reduce the bypass air amount, and conversely, if the engine temperature is low, it is necessary to increase the bypass air amount.

Therefore, in order to carry out this type of control, a plurality of temperature detecting elements and temperature detecting actuating elements are required, and it is necessary to construct a control circuit in consideration of temperature conditions, which complicates the structure. Not only that, the reliability also drops,
The cost increases accordingly. The present invention has been made to solve the above problems, and provides a highly reliable and low-cost temperature sensitive actuator that does not require a temperature detection element or a temperature detection operation element, and an idle speed controller using the same. The purpose is to do.

[0005]

A temperature-sensitive actuator according to [Claim 1] of the present invention includes a stator made of a magnetic material forming a yoke and an opening in the stator so as to be rotatable. In a temperature-sensitive actuator in which a rotor, a magnetic pole piece provided for magnetically connecting the stator and the rotor, and at least one magnetomotive force source are arranged in any of the above-mentioned parts, (Here, the magnetic permeability,
It means either saturation magnetic flux density, residual magnetic flux density or magnetomotive force. The same applies hereinafter), and a temperature-sensitive magnetic material is provided in a part of the magnetic path.

A temperature-sensitive actuator according to [Claim 2] of the present invention comprises a stator made of a magnetic material for forming a yoke,
An electromagnetic coil provided on the stator, a rotor composed of a cylindrical magnet rotatably provided in a biased opening in the stator, and a magnetic flux generated by the cylindrical magnet rotor and the electromagnetic coil to the rotor. In a temperature-sensitive actuator that generates a rotational force, a structure in which one or both of a negative-characteristic and a positive-characteristic temperature-sensitive magnetic material are arranged to face each other in a magnetic flux passage sandwiching the biased opening. And

The temperature-sensitive actuator according to [Claim 3] of the present invention is the temperature-sensitive actuator according to [Claim 2], wherein the temperature-sensitive magnetic material has either a negative characteristic or a positive characteristic, and a magnetic flux path sandwiching the biased opening is formed. The configuration is provided only on one side.

The temperature-sensitive actuator according to [Claim 4] of the present invention is configured such that, in [Claim 1], the temperature-sensitive magnetic material is provided only on a part of the pair of magnetic pole pieces.

According to a fifth aspect of the present invention, there is provided the temperature sensitive actuator according to the first aspect, wherein the temperature sensitive magnetic material is provided only on a part of the pair of magnetic pole pieces, and the stator is used instead of the magnet of the rotor. A permanent magnet with a magnetomotive force source was installed in.

In the temperature-sensitive actuator according to [Claim 6] of the present invention, in [Claim 1], the rotor is a permanent magnet, and a temperature-sensitive magnetic material is attached to each end of the magnet. .

According to a seventh aspect of the present invention, there is provided a temperature-sensitive actuator according to the first aspect, wherein each pair of magnetic pole pieces is made of a temperature-sensitive magnetic material having a negative characteristic or a positive characteristic different from each other. Configured.

In the temperature sensitive actuator according to [Claim 8] of the present invention, in [Claim 1], the rotor is formed by combining individual permanent magnets made of a temperature sensitive magnetic material having negative and positive characteristics. I chose

In the temperature sensitive actuator according to [Claim 9] of the present invention, in [Claim 1], the rotor is a normal magnetic material and a temperature-sensitive magnetic material having a negative characteristic, and a normal magnetic material and a positive characteristic. It was composed of a combination of a warm magnetic material and a temperature-sensitive magnetic material of negative and positive characteristics, and a permanent magnet as a magnetomotive force source was provided on the stator.

In the temperature sensitive actuator according to [Claim 10] of the present invention, in [Claim 1], the rotor is a permanent magnet, and the air gap of one magnetic pole piece is unbalanced with the air gap of the other. A negative temperature-sensitive magnetic material was interposed in the magnetic path of the stator formed between the corresponding magnetic pole pieces.

In the temperature sensitive actuator according to [Claim 11] of the present invention, in [Claim 1], an electromagnetic coil is provided as a magnetomotive force source above the magnetic path of the temperature sensitive magnetic material.

The idle according to claim 12 of the present invention
The speed controller uses a temperature sensitive actuator, and is provided to control a main air passage having a throttle valve, a bypass passage provided in parallel with the main air passage, and an air flow to the bypass passage. A valve that has a shaft that rotates integrally with the valve body and a cylindrical magnet as a rotor provided at the end of the shaft, and that generates a rotational force on the shaft via the rotor by the magnetic flux from an electromagnetic coil. In the idle speed controller that operates the body and controls the air flow to the bypass passage, the temperature-sensitive magnetic material is provided in a part of the magnetic path that sandwiches the opening in which the cylindrical magnet is installed.

[0017]

In the temperature-sensitive actuator according to [Claim 1] to [Claim 11] of the present invention, a temperature-sensitive magnetic material whose magnetic characteristics change according to temperature is placed in the magnetic path. So in normal times,
For example, when the temperature characteristic of the temperature-sensitive magnetic material is negative, the magnetic flux emitted from the magnetomotive force source returns through a predetermined magnetic path. However, if the temperature rises, the magnetic characteristics deteriorate according to the temperature. As a result, if a function is provided in which the magnetic flux passes through a magnetic path that is different from the magnetic path that is normally formed when it operates, it is possible to extract the operating force due to temperature.

The idol according to claim 12 of the present invention
The speed controller uses the temperature-sensitive actuator described above as a drive source for the idle speed controller. Therefore, although the basic operation is as described above, the object to be actuated after detecting the temperature change becomes the valve element (controller valve), and as a result, the air amount in the bypass passage can be controlled.

[0019]

Embodiments will be described below with reference to the drawings. Figure 1
FIG. 1 is a configuration diagram of an embodiment of a temperature sensitive actuator according to the present invention. In Figure 1, 1 denotes the body of the temperature-sensitive actuator, a stator (yoke) 10 made of a magnetic material, is connected to the stator pole pieces 11-1,11-2,11
-3, 11-4 and the rotor 1 fixed to the shaft 12
3, the rotor 13 in the present embodiment is a magnet having N and S poles. The magnetic pole pieces 11-1 and 11-4 are made of a temperature-sensitive magnetic material (shown as a matte portion) 14, for example, a material having a negative characteristic of thermoferrite.

FIG. 2 is a characteristic diagram of the temperature-sensitive magnetic material, in which the vertical axis represents the magnetic permeability μ and the horizontal axis represents the temperature T. As shown in the figure, there is one in which the magnetic permeability increases as the temperature rises (positive characteristic) and the other in which the magnetic permeability decreases as the temperature rises (negative characteristic).

Next, the operation will be described. In the case of the present embodiment, since thermoferrite is used as the temperature-sensitive magnetic material, normally, the magnetic force line A from the N pole of the magnet forming the rotor 13 is the magnetic pole piece 11-1, as shown by the solid line. 11
-2 to the yoke, magnetic pole pieces 11-3, 11-4
It becomes a loop that returns to the S pole through the path evenly. Therefore, the rotor 13 maintains the illustrated (neutral) position.

When the temperature rises, the pole pieces 11-1 and 11
-4, the magnetic permeability decreases, so the pole pieces 11-1, 11-
The magnetic field lines passing through No. 4 are weakened and strengthened toward the magnetic pole pieces 11-2 and 11-3 as indicated by the dotted lines. Therefore, the magnet 13 rotates counterclockwise around the shaft 12. Therefore, by setting the shaft 12 in the valve closing direction, the valve can be closed as the temperature rises.

In the above embodiment, the pole pieces 11-1, 11-
Although the whole 4 (matte portion) is made of a temperature-sensitive magnetic material such as thermoferrite having a negative characteristic, the present invention is not limited to this, and a similar effect can be obtained even if it is a part of the magnetic pole piece. In this case, a part means that it is provided partially (left and right part of the magnetic pole piece) along the direction of the magnetic force line. According to the above-described embodiment, the temperature sensitive detection actuating element as a separate body is unnecessary, the structure is simple and the cost can be reduced.

FIG. 3 is a block diagram of another embodiment. In FIG. 3, reference numeral 15 is a coil as a magnetomotive force source, and a rotor (magnet) 13 attached to the shaft 12 is rotatably provided in an opening 16 provided in a part of the yoke. In addition, around the magnet 13, there are wide openings (biased grooves) 16-1 on both side surfaces (left and right), and a gap is narrow between the upper side and the lower side.

The temperature-sensitive magnetic material 14 having a negative characteristic across the opening 16
However, the temperature sensitive magnetic material 17 having a positive characteristic is provided in the remaining corresponding portion in this embodiment. Therefore, as the temperature rises, the magnetic permeability of the temperature-sensitive magnetic material portion 14 decreases, and conversely, the magnetic permeability of the temperature-sensitive magnetic material portion 17 increases. These actions mutually increase the magnetic bias. That is, the difference in magnetic permeability due to the temperature rise becomes remarkable, and the operation is further ensured.

FIG. 4 is a block diagram of another embodiment. 4, the same parts as those in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, the temperature-sensitive magnetic material (negative characteristic) 14 is provided only on one side of the magnetic path sandwiching the magnet 13. In this embodiment, as the temperature rises, the temperature-sensitive magnetic material 14
As a result, the magnetic permeability to the dotted line portion increases. Therefore, the difference in magnetic permeability becomes remarkable, and the operation becomes more reliable.

FIG. 5 is a block diagram of still another embodiment. The same parts as those in FIG. 1 are designated by the same reference numerals and their description is omitted. In the present embodiment, the temperature-sensitive magnetic material 18 is provided only on a part (matte portion) of the pole pieces provided facing each other. If the temperature-sensitive magnetic material 18 has a negative characteristic, for example, the magnetic pole pieces 11-1 and 11-4 increase as the temperature rises.
The magnetic flux on the side decreases, and the other magnetic pole piece 11-2,
11-3 side increases. Therefore, the rotation angle of the rotor can be adjusted.

FIG. 6 is a block diagram of still another embodiment. The same parts as those in FIG. 5 are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, two permanent magnets 19- which are magnetomotive force sources
1, 19-2 are provided on the stator, and the rotor 13 is not a permanent magnet. Other configurations are the same as those in FIG. In this embodiment, in addition to the same effect as in the case of FIG. 5 described above, the size of the magnetomotive force source can be changed relatively easily, and the degree of freedom in application can be expanded.

FIG. 7 is a modification of FIG. 6, in which one permanent magnet 19 as a magnetomotive force source is provided in the stator, and the other side of the stator is opened to limit the passage of magnetic flux. Other configurations are similar to those of FIG. 6, and it is clear that the same effect as described above can be obtained.

FIG. 8 is a block diagram of still another embodiment. In this embodiment, a temperature-sensitive magnetic material is attached to the convex portion of the rotor 13 made of a permanent magnet, and no treatment is applied to the magnetic pole piece side. In the figure, for example, the satin area 20 has a negative characteristic and the shaded area 21 has a positive characteristic. According to the present embodiment, the magnetic permeability of the temperature-sensitive magnetic material changes according to the temperature rise, and the same function as described above can be obtained, and a specific function can be integrated in one rotor. It is convenient to manage parts by manufacturing with a specialized manufacturer.

FIG. 9 is a block diagram of another embodiment. In this embodiment, the temperature-sensitive magnetic material is a magnet on the pole piece side, and the rotor is not a magnet. In the figure, the pole piece 11-1,
11-4 is, for example, a ferrite magnet whose magnetomotive force decreases (negative characteristic) due to temperature rise, and corresponding 11-2, 11-
3 shows a case where a stable samarium-cobalt magnet (having a weak negative characteristic) is used. In this case, the operation normally follows the magnetic path that follows the solid line, but the magnetomotive force of the ferrite magnet decreases as the temperature rises, causing the rotor to rotate counterclockwise. In this embodiment, the same effect as that of each of the above embodiments can be obtained.

FIG. 10 is a block diagram of still another embodiment.
In this embodiment, the rotor 13 is configured by combining a permanent magnet as a temperature-sensitive magnetic material having a negative characteristic or a positive characteristic and a temperature-stable permanent magnet. That is, the satin area 22
It is a combination of the respective permanent magnets consisting of the shaded area 23 and the shaded area 23. The operation is as described above. It is obvious that the same effects as those of the above-mentioned respective embodiments can be obtained in this embodiment as well.

FIG. 11 is a block diagram of still another embodiment.
In this embodiment, the stator 10 is provided with two permanent magnets 24-1 and 24-2 as a magnetomotive force source. That is, the rotor 13 is constructed by combining temperature-sensitive magnetic materials having negative or positive characteristics. Also in this embodiment, the same effect as that of the above embodiment can be obtained.

FIG. 12 is a block diagram of another embodiment.
In this embodiment, one of the magnetic pole pieces 11-1 and 11-4 and the rotor 1 is used.
3 and an air gap 1 between the other magnetic pole piece 11-2,
It is unbalanced with that (not shown) between 11-3 and the rotor 13. That is, in the figure, l is larger than the other. Further, temperature-sensitive magnetic materials 25-1 and 25-2 having negative characteristics are provided between the magnetic pole pieces of the stator.

Therefore, the magnetic flux always follows the solid line path (at low temperature), but when the temperature rises, the temperature-sensitive magnetic materials 25-1 and 25-2 are turned off due to the decrease in magnetic permeability.
The magnetic path shown by the dotted line is formed. As a result, the rotor 13 rotates clockwise. Also in this embodiment, the same effect as that of the above embodiment can be obtained.

FIG. 13 is a block diagram of still another embodiment.
In this embodiment, based on FIG. 5, a part of the core is made of the temperature-sensitive magnetic material 2
7, and the electromagnetic coil 26 is wound on the upper part thereof. In this embodiment, when the current of the electromagnetic coil is kept flowing by using the principle already explained, the magnetic flux generated at high temperature is lowered by the negative temperature-sensitive magnetic material provided under the electromagnetic coil. Yes, it is used as a so-called fail-safe. Since the operating principle has been described repeatedly, it is omitted here.

Similar to FIG. 13, FIG. 14 is a view showing the mode of use, in which case it is used as a drive source for the choke valve. 28 is a choke valve in the side view (a), and is a system in which the rack 30 is driven by the temperature-sensitive actuator 29 and the choke valve 28 is rotated via the pinion 31 as shown in the front view (b). . Since the temperature-sensitive actuator rotates to a position where the torque generated by the eccentricity of the valve is balanced, the pinion can be directly connected to the valve. Further, if the temperature-sensitive actuator is of a type that can be electromagnetically driven, it is possible to actively control the air-fuel ratio.

FIG. 15 shows an embodiment in which the temperature-sensitive actuator described above is applied to an idle speed controller (ISC) of an automobile. The temperature-sensitive actuator main body used in the present embodiment has a coil 15 as a magnetomotive force source on the yoke 10.
Is wound, the rotor (made of a magnet) 13 is provided in the opening 16, and the temperature-sensitive magnetic material 14 is provided so as to sandwich the opening, which has already been sufficiently described.

FIG. 15 (a) is a front view, and FIG. 15 (b) is a schematic cross-sectional view seen from the center line (dashed line). The shaft 12 is attached with the bearing 32 as a fulcrum, and the shaft is further attached to the shaft. Fixed control valve 3
3 is configured to rotate with the shaft. Figure 15
(C) shows an outline of the inside of the body 34 in a sectional view, and the taken-in air flows to a bypass passage side different from the main air passage. Controlling the air volume in this case
The valve 33. However, since these configurations themselves are publicly known, the description thereof will be omitted.

According to the present embodiment, control is performed by using a temperature sensitive actuator in which a temperature sensitive magnetic material is inserted in a part of the magnetic path.
Since the valve is configured to be rotated, the idle control according to the temperature can be performed without providing the temperature sensing element as a separate body.

[0041]

As described above, according to the present invention, since the temperature-sensitive magnetic material whose magnetic characteristics change according to temperature is inserted in a part of the magnetic path, the temperature detecting actuation element is provided as a separate body. It is possible to provide a temperature-sensitive actuator that can be controlled according to the temperature and an idle speed controller that uses the temperature-sensitive actuator without the provision of the temperature sensor.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to [Claim 1] of the present invention.

FIG. 2 is a characteristic diagram showing a relationship between temperature and magnetic permeability of a temperature-sensitive magnetic material.

FIG. 3 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to [Claim 2] of the present invention.

FIG. 4 is a configuration diagram of an embodiment of a temperature sensitive actuator according to [Claim 3] of the present invention.

FIG. 5 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to [Claim 4] of the present invention.

FIG. 6 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to [Claim 5] of the present invention.

7 is a modification diagram of FIG.

FIG. 8 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to [Claim 6] of the present invention.

FIG. 9 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to [Claim 7] of the present invention.

FIG. 10 is a configuration diagram of an embodiment of the temperature sensitive actuator according to [Claim 8] of the present invention.

FIG. 11 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to [Claim 9] of the present invention.

FIG. 12 is a configuration diagram of an embodiment of a temperature-sensitive actuator according to [Claim 10] of the present invention.

FIG. 13 is an example diagram showing a usage mode.

FIG. 14 is another example diagram showing a mode of use.

FIG. 15 is a configuration diagram of an embodiment in which the temperature-sensitive actuator of the present invention is applied to an idle speed controller of an automobile.

[Explanation of reference numerals] 1 temperature-sensitive actuator body 10 stator (yoke) 11 pole piece 12 shaft 13 rotor 14, 18, 20, 22, 25 temperature-sensitive magnetic material (negative characteristic) 15 magnetomotive force source (coil) 16 opening 16-1 Wide opening (biased groove) 17,21,23 Temperature-sensitive magnetic material (positive characteristic) 19,19-1, 19-2 Permanent magnet 32 Bearing 33 Control valve

Claims (12)

[Claims] 1. A stator made of a magnetic material forming a yoke, a rotor rotatably provided in an opening in the stator, and magnetically connecting the stator to the rotor. A temperature-sensitive actuator in which the magnetic pole piece provided and at least one magnetomotive force source are arranged in any of the above-mentioned parts,
A temperature-sensitive actuator characterized in that a temperature-sensitive magnetic material whose magnetic characteristics change depending on temperature is provided in a part of a magnetic path. 2. A stator made of a magnetic material forming a yoke, an electromagnetic coil provided in the stator, and a rotor made of a cylindrical magnet rotatably provided in a biased opening in the stator, In a temperature-sensitive actuator that generates a rotational force in a rotor from the cylindrical magnet rotor and a magnetic flux generated by an electromagnetic coil, a temperature-sensitive magnetic material having a negative characteristic or a positive characteristic in a magnetic flux passage sandwiching the biased opening. A temperature-sensitive actuator characterized in that one or both of them are arranged so as to face each other and cross each other. 3. The temperature-sensitive actuator according to claim 2, wherein the temperature-sensitive magnetic material has either a negative characteristic or a positive characteristic, and is provided only in one of the magnetic flux paths sandwiching the biased opening. 4. The temperature-sensitive actuator according to claim 1, wherein the temperature-sensitive magnetic material is provided only on a part of the pair of magnetic pole pieces. 5. The temperature-sensitive actuator according to claim 1, wherein the temperature-sensitive magnetic material is provided only on a part of the pair of magnetic pole pieces, and a permanent magnet is provided on the stator as a magnetomotive force source. 6. The temperature-sensitive actuator according to claim 1, wherein the rotor is a permanent magnet, and a temperature-sensitive magnetic material is attached to each end of the magnet. 7. The temperature sensitive actuator according to claim 1, wherein each magnetic pole piece is made of a temperature sensitive magnetic material having a negative characteristic or a positive characteristic different for each pair of facing magnetic pole pieces. 8. The temperature-sensitive actuator according to claim 1, wherein the temperature-sensitive magnetic material is a permanent magnet whose magnetomotive force greatly changes with temperature, and is configured in combination with a temperature-stable permanent magnet. 9. The rotor comprises a combination of a normal magnetic material and a negative characteristic temperature-sensitive magnetic material, a normal magnetic material and a positive characteristic temperature-sensitive magnetic material, and a negative characteristic and a positive characteristic temperature-sensitive magnetic material. The temperature-sensitive actuator according to claim 1, wherein the stator is provided with a permanent magnet as a magnetomotive force source. 10. The rotor is made of a permanent magnet, the air gap of one magnetic pole piece is formed to be unbalanced with the other air gap, and the temperature-sensitive magnetism is formed in the magnetic path of the stator between the corresponding magnetic pole pieces. The temperature-sensitive actuator according to claim 1, wherein a material is interposed. 11. The temperature-sensitive actuator according to claim 1, wherein an electromagnetic coil is provided as a magnetomotive force source above the magnetic path of the temperature-sensitive magnetic material. 12. A main air passage having a throttle valve,
A bypass passage provided in parallel with the main air passage, a shaft that rotates integrally with a valve body provided to control the air flow to the bypass passage, and a cylinder as a rotor provided at the end of the shaft. In the idle speed controller, which has a magnet and operates a valve body by generating a rotational force on a shaft through the rotor by a magnetic flux from an electromagnetic coil to control an air flow to a bypass passage, the cylinder An idle speed controller characterized in that a temperature-sensitive magnetic material is provided in a part of the magnetic path that sandwiches the opening where the magnet is installed.