JP3315815B2 - Temperature-sensitive actuator and idle speed controller using it - Google Patents

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 which generates a driving force by detecting a temperature change of an environment or a specific device, and an idle speed controller using the same.

[0002]

2. Description of the Related Art There are various cases where it is desired to change the response condition of a predetermined device in accordance with a change in environment or temperature of the device.
For example, this includes control of the amount of intake air in an idling operation state of an automobile. As this type of conventional device,
For example, those using wax as a temperature detection operating element,
Alternatively, a number of methods have already been proposed, such as a method using a bimetal, a method in which a temperature detecting element is attached to a necessary part, and a predetermined control is performed by collecting detection signals from the temperature detecting elements.

[0003]

The conventional apparatus in the above system has the following disadvantages. For example, when the vehicle is idling, the amount of intake air is also affected by the engine temperature. That is, if the engine temperature is high, the amount of bypass air must be reduced, and if the engine temperature is low, the amount of bypass air must be increased.

Therefore, this type of control requires a plurality of temperature sensing elements and temperature sensing operating elements, and it is necessary to construct a control circuit taking into account the temperature conditions, which complicates the structure. Not only that, the reliability is reduced,
The cost increases accordingly. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a highly reliable and low-cost temperature-sensitive actuator which does not require a temperature detecting element or a temperature detecting operating element, and an idle speed controller using the same. It is intended to be.

[0005]

According to a first aspect of the present invention, there is provided a temperature-sensitive actuator comprising: a stator made of a magnetic material forming a yoke; and a rotatably provided opening in the stator. In order to magnetically connect the rotor, the stator and the rotor, a plurality of pole pieces connected to the stator and disposed, and at least one permanent magnet are disposed in any of the respective portions. In the temperature-sensitive actuator, the magnetic properties (here, permeability, saturation magnetic flux density,
It means any of residual magnetic flux density and magnetomotive force. same as below. The temperature-sensitive magnetic member, whose temperature changes), is provided on a part of the stator, and an electromagnetic coil as a magnetomotive force source is wound around the periphery of the temperature-sensitive magnetic member.

According to a second aspect of the present invention, there is provided a temperature-sensitive actuator, comprising: a stator made of a magnetic material forming a yoke;
A rotor formed of an electromagnetic coil provided on the stator, 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; In a temperature-sensitive actuator that generates a rotational force, one or both of a temperature-sensitive magnetic material having a negative characteristic and a positive characteristic are disposed in a magnetic flux path sandwiching the biased opening so as to face and cross each other. .

According to a third aspect of the present invention, there is provided a temperature-sensitive actuator according to the second aspect, wherein the temperature-sensitive magnetic material has one of a negative characteristic and a positive characteristic, and the magnetic flux path of the magnetic flux path sandwiching the biased opening. It was provided only on one side.

An idle speed controller according to a fourth aspect of the present invention provides 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. It has a shaft that rotates integrally with a valve element provided for control, and a cylindrical magnet as a rotor provided at the end of the shaft, and rotates by a magnetic flux from an electromagnetic coil to the shaft via the rotor. In an idle speed controller that generates a force to operate a valve body and control an air flow to a bypass passage, a temperature-sensitive magnetic material is provided in a part of a magnetic path sandwiching an opening where the cylindrical magnet is installed. did.

[0009]

[0010]

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

The temperature-sensitive actuator according to any one of claims 1 to 3 of the present invention contains a temperature-sensitive magnetic material whose magnetic characteristics change according to the temperature in the magnetic path. Therefore, in a normal state, the magnetic flux emitted from the magnetomotive force source performs an operation to return via a predetermined magnetic path when the temperature characteristic of the temperature-sensitive magnetic material is negative, for example.
However, when the temperature rises, the magnetic properties decrease according to the temperature. As a result, if a function is provided that operates when magnetic flux passes through a magnetic path different from the formed magnetic path in a normal state, an operating force due to temperature can be taken out.

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

[0019]

An embodiment will be described below with reference to the drawings. 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, and in this embodiment, the rotor 13 is a magnet having N and S poles. The pole pieces 11-1 and 11-4 are made of a temperature-sensitive magnetic material (shown as a satin portion) 14, for example, a thermoferrite having a negative characteristic.

FIG. 2 shows 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 are a type in which the magnetic permeability increases as the temperature increases (positive characteristic) and a type in which the magnetic permeability decreases as the temperature increases (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, the line of magnetic force A from the N pole of the magnet forming the rotor 13 normally has the magnetic pole pieces 11-1 and 11-1 as shown by the solid lines. 11
-2 flows into the yoke, and the pole pieces 11-3, 11-4
, A loop returning to the S pole via the same. Therefore, the rotor 13 maintains the illustrated (neutral) position.

When the temperature rises, the pole pieces 11-1 and 11-1
-4 decreases the magnetic permeability of the magnetic pole pieces 11-1 and 11-.
The lines of magnetic force passing through 4 are weakened and become stronger toward the pole pieces 11-2 and 11-3 as shown by the dotted lines. Therefore, the magnet 13 rotates counterclockwise about the shaft 12. Therefore, if the shaft 12 is set in the closing direction of the valve, the valve can be closed as the temperature rises.

In the above embodiment, the pole pieces 11-1, 11-
Although the entirety (the satin portion) of 4 was made of a temperature-sensitive magnetic material such as thermoferrite having negative characteristics, the present invention is not limited to this, and the same effect can be obtained as a part of the pole piece. In this case, a part means that a part is provided along the direction of the line of magnetic force (part of the right and left pole pieces). According to the above embodiment, a separate temperature-sensitive detection operating element is not required, 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 denotes 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. The magnet 13 has wide openings (biased grooves) 16-1 on both sides (left and right) on both sides (left and right), and the gap between the upper part and the lower part is narrow.

The temperature-sensitive magnetic material 14 having a negative characteristic across the opening 16
Is similar to that of the above-described embodiment (FIG. 1), but in this embodiment, a temperature-sensitive magnetic material 17 having a positive characteristic is provided in the remaining corresponding portion. Therefore, the magnetic permeability of the temperature-sensitive magnetic material 14 decreases with increasing temperature, and the magnetic permeability of the temperature-sensitive magnetic material 17 increases with increasing temperature. These effects increase the magnetization of each other. That is, the difference in the magnetic permeability accompanying 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 denoted by the same reference numerals, and the description 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, the temperature-sensitive magnetic material 14
, The magnetic flux to the dotted line portion increases as a result. Therefore, the difference in the magnetic permeability becomes remarkable, and the operation is further ensured.

FIG. 5 is a block diagram of still another embodiment, and the same parts as those in FIG. In the present embodiment, the temperature-sensitive magnetic material 18 is provided only on a part of the pole pieces provided opposite each other (the satin portion). When the temperature-sensitive magnetic material 18 is made of, for example, a material having a negative characteristic, the pole pieces 11-1, 11-4 are increased as the temperature rises.
Side magnetic flux 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, and the same parts as those of FIG. In the present embodiment, two permanent magnets 19-
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 obtaining the same effect as in the case of FIG. 5, the size of the magnetomotive force source can be changed relatively easily, and the degree of freedom in application can be increased.

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

FIG. 8 is a block diagram of still another embodiment. In this embodiment, a temperature-sensitive magnetic material is adhered to the protrusion of the rotor 13 made of a permanent magnet, and no treatment is performed on one side of the magnetic pole. In the figure, for example, the satin portion 20 has a negative characteristic, and the hatched portion 21 has a positive characteristic. According to the present embodiment, the magnetic permeability of the temperature-sensitive magnetic material changes in accordance with the temperature rise, and it is possible to perform the same function as described above, but also to integrate a specific function into one rotor. Manufacturing by a specialized manufacturer is convenient for parts management.

FIG. 9 is a block diagram of still another embodiment. In this embodiment, one side of the magnetic pole is used as a magnet as a temperature-sensitive magnetic material, and the rotor is not used as a magnet. In the figure, the pole pieces 11-1,
11-4 is a ferrite magnet whose magnetomotive force decreases (negative characteristic) due to a rise in temperature, for example.
3 shows a case where a stable (having a weak negative characteristic) samarium cobalt magnet is used. The operation in this case is usually a magnetic path following the solid line, but the magnetomotive force of the ferrite magnet decreases with the rise in temperature, and the rotor rotates counterclockwise. In this embodiment, effects similar to those 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 negative characteristics or positive characteristics and a permanent magnet stable in temperature. That is, the satin portion 22
And a combination of the respective permanent magnets composed of the hatched portions 23. The operation is as described above. It is apparent that the present embodiment also provides the same effects as those of the above embodiments.

FIG. 11 is a block diagram of still another embodiment.
In the present 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 formed by combining temperature-sensitive magnetic materials having negative characteristics or positive characteristics. In this embodiment, the same effects as those of the above embodiment can be obtained.

FIG. 12 is a configuration diagram of still another embodiment.
In this embodiment, one of the pole pieces 11-1 and 11-4 and the rotor 1
3 and the other pole piece 11-2,
It is unbalanced with that between the rotor 11-3 and the rotor 13 (not shown). That is, in the figure, 1 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 path indicated by the solid line (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 the magnetic permeability.
A magnetic path indicated by a dotted line is formed. As a result, the rotor 13 rotates clockwise. In this embodiment, the same effects as those of the above embodiment can be obtained.

FIG. 13 is a block diagram of still another embodiment.
The present embodiment is based on FIG.
7, and an electromagnetic coil 26 is wound therearound. In this embodiment, when the current of the electromagnetic coil continues to flow using the principle already described, the magnetic flux generated at a high temperature is reduced by the negative characteristic temperature-sensitive magnetic material provided below the electromagnetic coil. Yes, so-called fail-safe. The operation principle has been repeatedly described, and thus will not be described here.

FIG. 14 is a diagram showing a mode of use similarly to FIG. 13. In this case, it is used as a drive source for a choke valve. In the side view (a), a choke valve 28 drives the rack 30 by a temperature-sensitive actuator 29 and rotates the choke valve 28 via a pinion 31 as shown in a front view (b). . Since the temperature-sensitive actuator rotates to a position that balances the torque generated by the eccentricity of the valve, the pinion and the valve can be directly connected. If the temperature-sensitive actuator is of a type that can be driven electromagnetically, aggressive air-fuel ratio control is also possible.

FIG. 15 shows an embodiment in which the above-mentioned temperature-sensitive actuator is applied to an idle speed controller (ISC) of an automobile. The temperature-sensitive actuator body used in the present embodiment is provided with a coil 15 as a magnetomotive force source on a yoke 10.
And a rotor (composed of a magnet) 13 is provided in the opening 16 and a temperature-sensitive magnetic material 14 is provided across 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 taken along the center line (dashed line). Fixed control valve 3
3 is configured to rotate with the shaft. FIG.
(C) shows an outline of the inside of the body 34 in a sectional view, and the taken air flows to the bypass passage side different from the main air passage. The control of the air volume in this case is the control
The valve 33. However, since these configurations are known, their description is omitted.

According to the present embodiment, control is performed using a temperature-sensitive actuator in which a temperature-sensitive magnetic material is inserted into a part of the magnetic path.
Since the valve is configured to rotate, the idle control according to the temperature can be performed without providing the temperature sensing element separately.

[0041]

As described above, according to the present invention, a temperature-sensitive magnetic material whose magnetic characteristics change according to the temperature is inserted into a part of the magnetic path. A temperature-sensitive actuator capable of performing control in accordance with the temperature without providing the same and an idle speed controller using the same can be provided.

[Brief description of the 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.

FIG. 7 is a modified example of FIG. 6;

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 a 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 use mode.

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

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.

[Description of Signs] 1 Thermosensitive actuator body 10 Stator (yoke) 11 Magnetic pole piece 12 Shaft 13 Rotor 14, 18, 20, 22, 25 Thermosensitive 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

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02N 10/00 F02D 45/00 360 F02M 69/32 H01F 7/08

Claims (4)

(57) [Claims] And 1. A stator made of a magnetic material forming a yoke, a rotor rotatably mounted In the opening in the stator, the stator and the rotor and for magnetically connecting the to a plurality of pole pieces arranged are connected to the stator, in the temperature-sensitive actuator in which at least one permanent magnet is disposed on any of the respective sections, the temperature-sensitive magnetic member which magnetic characteristics change with temperature Part of the stator
A magnetomotive force source is provided on the periphery of the temperature-sensitive magnetic member.
A temperature-sensitive actuator characterized by winding an electromagnetic coil . 2. A stator made of a magnetic material forming a yoke, an electromagnetic coil provided in the stator, a rotor comprising a cylindrical magnet rotatably provided In the biasing the opening in the stator A temperature-sensitive actuator for generating a rotational force in the rotor from the cylindrical magnet rotor and a magnetic flux generated by an electromagnetic coil, wherein a negative or positive temperature-sensitive magnetic material is provided in a magnetic flux path 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,
The temperature-sensitive actuator is characterized in that the temperature-sensitive magnetic material has one of a negative characteristic and a positive characteristic, and is provided in only one of the magnetic flux paths sandwiching the deviated opening. 4. A main air passage having a throttle valve.
A bypass passage provided in parallel with the main air passage of
Integrated with valve body provided to control air flow to the path
A shaft rotating at an end of the shaft.
With a cylindrical magnet as a trochanter, the magnetic flux from the electromagnetic coil
To generate a rotational force on the shaft via the rotor
Actuate the valve to control the airflow to the bypass passage.
In the idle speed controller, the cylindrical magnet
A temperature-sensitive magnetic material is provided in a part of the magnetic path sandwiching the opening where the stone is installed
Idle speed control
La.