JPH0534518B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a method for variably controlling the flow rate of fluid such as air, which is used to variably control the intake air flow rate of an automobile engine, particularly in an idling operating state. This invention relates to a rotary solenoid actuator.

[Prior Art] For example, in the intake pipe of an engine for a production vehicle, a bypass passage is formed so as to be parallel to the throttle valve portion, and the throttle valve is particularly placed in this bypass passage. When the engine is fully closed, intake air is passed through to set the engine's idle speed. Therefore, the idle rotation state of the engine is controlled in accordance with the flow rate of air passing through this bypass passage, and this bypass passage is provided with a valve mechanism for controlling the air flow rate. For example, as disclosed in Japanese Patent Application Laid-Open No. 57-73839, it is known to control the amount of air flowing through this bypass passage using an electromagnetic actuator.

In the idling operating state in which the throttle valve is fully closed, the engine rotational speed is set to a predetermined idling rotational speed.
In response to engine cooling water temperature and engine temperature,
The idle rotation speed, that is, the amount of air passing through the bypass passage is controlled, and this air flow rate control is performed by a valve mechanism set in the bypass passage.

Conventional actuators that perform such air flow control have different control modes depending on their temperature conditions, and control in low-temperature ranges corresponds to the temperature of bimetals, thermowaxes, etc. Electromagnetic actuators have come to be used for air flow control in high temperature ranges. This is to ensure safety in controlling the amount of intake air.If one electromagnetic actuator is used to control a wide range from low to high temperatures, the actuator will be able to control accurately in the event of a malfunction, such as a temperature sensor. This is because you will not be able to do so.

[Problems to be Solved by the Invention] This invention has been made in view of the above-mentioned points. For example, even if a failure occurs in the movable parts of an electromagnetic mechanism or a bimetal mechanism, it is possible to solve the problem smoothly. Particularly compact construction that allows continuous operation and a wide range of fluid flow control, such as intake air, from low to high temperature ranges, making it possible, for example, to control the idle operating state of the engine. In this manner, it is an object of the present invention to provide a rotary solenoid actuator that effectively controls the air flow rate in a bypass passage of an engine intake pipe.

[Means for Solving the Problems] That is, in the rotary solenoid actuator according to the present invention, the drive shaft, which is integrated with the valve body that variably controls the area of the fluid passage, changes its rotation angle in accordance with the temperature. In addition to regulating the range, a magnet is attached to the drive shaft so that magnetic poles are set at both ends of a line perpendicular to the axis, and this magnet part is formed in the core of the electromagnetic coil device. It is set to be inserted into the opening. The core constituting this electromagnetic coil device is composed of a first core having the above-mentioned opening and a second core set in a state parallel to this core,
Both ends of the first and second cores are connected by a magnetic circuit,
The second core is coaxially wound with first and second coils that generate magnetic flux in opposite directions, and the first core has coils arranged on both sides of the opening. Detent grooves are respectively formed, and mounting holes are formed to limit the area of the magnetic passage.

[Operation] In the rotary solenoid actuator configured as described above, the magnetic passage is narrowed on both sides of the opening formed in the first core portion of the electromagnetic coil device, and a magnetic saturation zone is formed. Thus, the rotational angular position of the magnet is set as a reference with no current flowing through the first and second coils. Then, the rotation angle position of the magnet, that is, the valve body integrated with the drive shaft, is set at a position corresponding to the amount of current flowing through the first and second coils, so that the amount of fluid flowing is controlled. become.
In this case, the movable range of the drive shaft is regulated in accordance with the temperature; for example, the limit for the amount by which the valve body closes when the temperature reaches a high temperature is set in accordance with the temperature state. will be done. In this case, since the first and second coils of the electromagnetic coil device have a structure in which one core is wound, the structure can be sufficiently miniaturized, and the electromagnetic coil device can be installed and set. The output characteristics and magnetic hysteresis on the coil side can be easily controlled through the mounting holes, and the linearity of the characteristics can be easily set.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings. FIG. 1 shows its cross-sectional configuration, and numeral 11 is a housing made of a non-magnetic material such as synthetic resin or aluminum. A drive shaft 12 is rotatably supported in the housing 11 by bearings 13 and 14, and a valve body 1 is integrally attached to the drive shaft 12.
5 is installed. As the drive shaft 12 rotates, the valve body 15 is rotated to variably control the area of the fluid passage.

A permanent magnet 16 is fitted into one end of the drive shaft 12 and rotated integrally with the drive shaft, and an electromagnetic coil device 17 is provided corresponding to the magnet 16. There is. In this electromagnetic coil device 17, the first and second coils, which generate magnetic fluxes in opposite directions, are wound at the same time, for example, by bifurcating winding. The first and second coils each receive a bypass-like excitation current with an open duty setting and a pulse-like excitation current with a closed duty setting, as shown in Fig. 2. We are making sure that it is supplied.

FIG. 3 shows the configuration of the electromagnetic coil device 17. The magnet 16 set in the electromagnetic coil device 17 has a cylindrical shape that is fitted into the drive shaft 12. Both N and S magnetic poles are set at both ends of the line. The core 18 constituting the electromagnetic coil device 17 includes a first core 182 in which a circular opening 181 is formed through which the magnet 16 portion of the drive shaft 12 is inserted;
a second core 18 set in parallel with 82;
3, and both ends of the first and second cores 182 and 183 are connected by third and fourth cores 184 and 185 to form one closed circuit. And the second above
An excitation coil 186 is wound around the core 183 of. Here, although this excitation coil 186 is composed of the first and second coils as described above, the detailed winding structure thereof is omitted in this figure.

The opening 181 is set slightly larger than the outer diameter of the magnet 16;
Detent grooves 187 and 188 are formed on both sides of the first core 182 in the extending direction, that is, in the direction in which the magnetic flux passes. and,
Mounting holes 191 and 192 into which screws are inserted for attaching and setting the electromagnetic coil device 17 to the housing 11 are provided at positions close to both ends of the core constituting the electromagnetic coil device 17, particularly the first core 182. It is formed. In this case, the mounting holes 191, 192 are formed to limit the magnetic flux passage area in a closed circuit, and by changing the size of the mounting holes 191, 192, the magnetic flux can be controlled. The area passed through will now be adjusted.

In such an electromagnetic coil device 17, a rotational force is applied to the magnet 16 by the magnetic flux generated in accordance with the amount of excitation current flowing through the first and second coils. When no excitation current is applied to the excitation coil 186, the magnet 16 is in the state shown by A in FIG. That is, the magnetic flux density around the magnet 16 is made non-uniform due to the detent grooves 187 and 188, and non-uniform portions occur in the magnetic flux loop, causing each magnetic pole of the magnet 16 to 188, that is, the position where the distance to the core is closest to N and S.
The respective magnetic poles of are set to face each other.

Next, when an excitation current is supplied to the first coil, a magnetic flux loop as shown by the arrow B in FIG. 4, for example, is formed. Here, the cross-sectional area of the core 182 is reduced at the side of the opening 181, and therefore the magnetic flux becomes saturated at this portion. As a result, a part of the magnetic flux of this first core 182 comes to pass through the magnet 16,
S and N poles are formed on the sides of the detent grooves 187 and 188, respectively, so that the magnet 16 can be rotated as shown. Moreover, when the excitation current starts to flow through the second coil, a magnetic flux loop as shown by the arrow C in FIG. 4 is formed, contrary to the above case, and the magnet 16 is
It will now be rotated in the opposite direction from the one shown.
Then, as shown by D in FIG.
When the excitation current is simultaneously supplied to each of the coils, the magnet 16 is set at a rotational angular position corresponding to the ratio of the amount of current flowing through both coils.

FIG. 5 shows the cross-sectional structure of the part corresponding to the - line in FIG. The air outlet 201 is set,
Furthermore, an air inlet 202 is formed so as to open to the input air port of the intake pipe 21 toward the air cleaner. Here, a throttle valve 22 is set between the input air port and the output air port of the intake pipe 21, and the throttle valve 21 closes the intake pipe 21 when the accelerator pedal is released. The intake air is supplied from the air cleaner side to the engine side using the opening 203 controlled by the valve body 15 as a bypass passage. An opening 203 forming an air passage communicating between the outlet 201 and the inlet 202 is controlled to open and close by a valve body 15 that rotates together with the drive shaft 12. The amount of air flowing from the air inlet 202 to the air outlet 201 is controlled depending on the direction and amount.

A locking protrusion 23 is attached to the end of the drive shaft 12 opposite to the magnet 16 so as to extend laterally of the drive shaft 12 . This locking protrusion 23
is set in a recess 25 formed in the end face of a holder 24 that is rotatably set in a cylindrical chamber formed coaxially with the drive shaft 12 in the housing 11 . Here, the holder 24 is set to face a boss 26 that is fitted and fixed into a chamber in the housing 11, and a coil wound around the outer periphery of the holder 24 and the boss 26, which are set in a coaxial state, is Bimetal 27 is set. Both ends of this bimetal 27 are connected to notches 241 and 261 formed in the end faces of the holder 24 and the boss 26, respectively.
The rotation angle position of the holder 24 is set in response to temperature changes.

FIG. 6 shows a cross-sectional structure of a portion corresponding to the - line in FIG. 1, which corresponds to the holder 24, and the holder 24 is rotated counterclockwise as the temperature rises. A fan-shaped cutout 251 into which the locking protrusion 23 is inserted is formed in the recess 25 of the holder 24, and the protrusion 23 is rotated within the range of the cutout 251. . That is, the guard range θ3 in which the valve body 15 can rotate is set by the notch 251. Here, the rotation range of the holder 24 as the temperature rises is appropriately adjusted and set by the stopper screw 28.

In the rotary solenoid actuator configured as described above, the first and second coils of the electromagnetic coil device 17 are arranged such that when the throttle valve 22 is fully closed, the amount of air required during idling operation is adjusted. An excitation current is applied to control and set the opening degree of the valve body 15 forming a bypass passage of the intake pipe 21. Although not shown in this diagram, this excitation current is applied to a microcomputer for engine control based on detection signals from sensors connected to the engine that detect the load condition of the air conditioner, engine cooling water temperature, etc. For example, when the air conditioner is on and the engine load is high, the valve body 15 is driven to increase the amount of bypass air.

Here, the excitation current supplied to the first and second coils is in the form of a pulse as shown in FIG.
The amount of excitation current supplied to the first coil that rotates the drive shaft in the opening direction is determined by the open duty, which corresponds to the on time of the pulsed current supplied to the first coil. Furthermore, an exciting current is supplied to the second coil to rotate the drive shaft in the direction of closing the valve body 15, and the amount of current is determined by the close duty corresponding to the off time. Ru.

FIG. 7 shows the rotation angle of the drive shaft 12 and the state of the torque acting at this time when no excitation current is supplied to the excitation coil 186 of the electromagnetic coil device 17. On the other hand, Fig. 8 shows the relationship between open duty and torque when the excitation current is supplied to the first coil, and Fig. 9 shows the relationship between the open duty and torque when the excitation current is supplied to the second coil. It shows the relationship between the close duty and the torque acting on the drive shaft 12 when this occurs. That is, as the open duty increases, the driving force acts in the direction to open the valve body 15, and as the close duty increases, the torque in the direction to close the valve body 15 acts on the drive shaft 12. It becomes effective. The state in which these are combined is shown in FIG. 10.

Furthermore, FIG. 11 shows the relationship between the open duty and the excitation current T1 that flows through the first coil, and FIG.
FIG. 13 shows the state of the exciting current when the open duty and the closed duty are combined.

In a rotary solenoid actuator having such an electromagnetic coil device 17, when no excitation current is supplied to the excitation coil 186, the valve body 15 is set to a neutral reference position, and the air flow rate is The state shown by T in the figure is reached. When an excitation current is supplied to the first coil in this state, the air flow rate is controlled as shown by T1 in FIG. 14 in relation to the open duty of this excitation current. Further, when the excitation current is supplied to the second coil, the air flow rate is controlled as shown by T2 in FIG. 15 in relation to the close duty. Therefore, the relationship between the open and closed duties and the air flow rate is as shown by the broken line in FIG. 16.

That is, the valve body 1 changes in response to the duty change of the excitation current supplied to the first and second coils
The rotation angle of No. 5 and the air flow rate of the bypass passage of the intake pipe controlled by this valve body 15 are as follows:
It will change as shown in the figure.

Here, the drive shaft 12 integrated with the valve body 15
The rotation angle range is restricted by the movable range of the locking protrusion 23 in the recess 25 formed in the holder 24. The holder 24 that restricts the rotatable range of the drive shaft 12 has its rotational angle position set by a bimetal 27, and therefore the drive shaft 12
The rotation angle range of the valve body 15 which is rotated together with the valve body 15 and the air flow rate controlled by this valve body 15 are defined as the range surrounded by lines A and B in FIG. 18 in accordance with the temperature. Become so. That is, the rotational speed control range, for example during idling, is regulated in accordance with the temperature.

In this case, the rotation stopper mechanism of the holder 24 prevents it from rotating any further when the temperature rises above a certain level.
Therefore, if the temperature rises above the temperature at which the stopper mechanism acts,
As shown by A' in FIG. 18, the air flow rate is no longer reduced, and, for example, the idling state of the engine can be stably maintained even in high temperature conditions.

In order to stably perform such actuator operation, it is important that the rotation angle of the drive shaft 12 is stably controlled, and therefore the operating characteristics of the electromagnetic coil device 17 are important. .

In the electromagnetic coil device 17 as shown in FIG. 3, its return output is determined by the energy possessed by the magnet 16 and the sizes of the detant grooves 187 and 188. On the other hand, the output from the excited coil section is determined by the coil ampere turns and the magnetic flux path area of the core 18. However, in reality, it is difficult to manufacture the core 18 with a stable magnetic flux passage area and the like, and it is also difficult to guarantee the linearity of the product characteristics. Therefore, this electromagnetic coil device 1
Mounting holes 191 and 192 used when assembling 7 and housing 11 are used to control the output characteristics and magnetic hysteresis of the excitation coil.

The detent torque on the return side tends to increase less as the rotation angle of the magnet 16 increases. Further, the coil output increases linearly as the excitation current increases, and therefore the product characteristics have quadratic characteristics with respect to the increase in excitation current.

For example, if a hole is made in the magnetic flux path of the core 18 so as to increase the magnetic resistance, the area of the path becomes smaller, so that the linearly increasing coil output gradually leaks.
The slope of product characteristics becomes less steep. That is, the mounting holes 191 and 1 formed in the core 18
By adjusting the size of 92, the linearity of the product characteristics can be improved.
Also, magnetic hysteresis is reduced as it leaks through the magnetic path.

Here, the mounting holes 191 and 192 are
In particular, it does not affect the resin mold etc. that form the appearance, and therefore the mounting holes 19 are determined for each manufacturing rod or by using a selection method.
The magnetic properties can be adjusted by changing the size of 1,192, and the product properties can be easily stabilized.

[Effects of the Invention] As described above, in the rotary solenoid actuator according to the present invention, the electromagnetic mechanism part in particular can be made smaller and the product characteristics can be effectively stabilized. Operating characteristics against temperature changes can also be easily set.
Therefore, it can be effectively applied, for example, as a control mechanism for the air flow rate in a bypass passage set in the intake pipe of an automobile engine, and the idling operation control of the engine can be controlled in accordance with the operating condition of the engine. This allows for highly accurate control.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional configuration diagram illustrating a rotary solenoid actuator according to an embodiment of the present invention, Fig. 2 is a diagram illustrating the state of excitation current that drives and controls the above device, and Fig. 3 is a configuration of the above device. A to D in FIG. 4 are diagrams each explaining the operating state of the electromagnetic coil device, and FIGS. 5 and 6 are diagrams showing the configuration of the electromagnetic coil device shown in FIG. 7 to 10 are cross-sectional views of the valve body portion and holder portion corresponding to the line and - line, respectively, and FIGS. FIG. 13 is a diagram showing the relationship between the duty of the pulsed current applied to the coil and the amount of current, and FIGS. 14 to 16 are diagrams showing the relationship between the duty and flow rate, respectively.
FIG. 17 is a diagram showing the relationship between duty and control amount, and FIG. 18 is a diagram showing the state of temperature and control amount range. DESCRIPTION OF SYMBOLS 11... Housing, 12... Drive shaft, 15... Valve body, 16... Magnet, 17... Electromagnetic coil device, 18...
Core, 181... Opening, 182, 183... First and second core, 186... Coil, 187, 188
...Detent groove, 191, 192...Mounting hole, 2
3... Locking protrusion, 24... Holder, 25... Recess, 25
1...notch part, 26...boss, 27...bimetal.

Claims (1)

[Scope of Claims] 1. A housing having a fluid inlet and a fluid outlet; a drive shaft rotatably supported within the housing; a valve body that varies a passage area between the inlet and the outlet of the fluid in accordance with the rotation angle of the drive shaft; and a mechanism that sets the rotation range of the drive shaft in accordance with the temperature. , a magnet provided integrally with the drive shaft and having magnetic poles set on both sides passing through the axis of the drive shaft, and a core having an opening through which the magnet portion of the drive shaft is set. , an electromagnetic coil device in which first and second coils are wound so as to generate magnetic flux in opposite directions, and the core of the electromagnetic coil device is connected to the magnet of the drive shaft. a first core having an opening through which the first and second coils are wound coaxially; Both ends of each core are connected to each other by a magnetic circuit so that the cores are set parallel, and detent grooves are formed on both sides of the opening parallel to the direction of magnetic flux of the first core. In addition, in the magnetic flux path of this core, a mounting hole is formed through which the electromagnetic coil device is fixedly set to the housing and a second screw is inserted, so that the magnetic flux path area can be varied by this mounting hole. A rotary solenoid actuator featuring: