JPS6236146B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device control device that controls various devices used in an exhaust gas purification system for an automobile engine, and in particular, it relates to a device control device that controls various devices used in an exhaust gas purification device for an automobile engine. The present invention relates to a device control device that controls pressure.

Automotive engine exhaust gas purification technology has made great progress as exhaust gas regulations have become stricter, and as a result, the devices installed in engines have expanded from a simple combination of a throttle position and ignition retard device to two. They are becoming more complex and sophisticated, combining secondary air supply systems, EGR systems, ignition timing control systems, air-fuel ratio control systems, and more. Therefore, a control device with excellent control accuracy and improved reliability is required to control the operation of these devices. Therefore, as a control device to meet this requirement, a device control device is being considered that controls the operation of the device using a so-called flapper type negative pressure switching valve that alternately switches between atmospheric pressure and negative pressure using a duty signal. .

However, in conventional device control devices of this type, the output pressure of the negative pressure switching valve operated by the duty signal is usually 0 mm as shown in Figure 1.
Since the pressure rises from Hg, the negative pressure characteristics up to the device's valve opening operation negative pressure become meaningless, reducing the effective control range for controlling the operation of the device. For example, in the case of a device where the valve opening operation negative pressure is -100 mmHg, and when the negative pressure switching valve switches between the atmosphere and the negative pressure of -400 mmHg as shown in the first diagram,
The duty range from 0 to 25% becomes invalid. Therefore, the conventional control device has the drawback that it is difficult to reliably control the operation of the device, and its control performance is significantly reduced.

The present invention is intended to eliminate the above-mentioned conventional drawbacks, and is aimed at reducing the rise of output pressure at the switching valve to 0 mm.
The object of the present invention is to provide a device control device that increases the effective control range by increasing the pressure from Hg to the valve opening operating pressure of the device.

In order to achieve the above object, the present invention includes a switching valve that alternately switches and introduces a first input pressure and a second input pressure according to a duty signal and supplies the output pressure to a device, and a switching valve that supplies the output pressure to a device. The regulator valve is configured to cut off at least one of the first input pressure and the second input pressure to a predetermined value and maintain it at a constant value.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 shows the device control device of the first embodiment, in which the negative pressure switching valve 10 has a first body 14 having a first input port 11, a second input port 12, and an output port 13, and a second body 14. 15 are integrally and airtightly connected. Both bodies 14,1
A negative pressure chamber 16 is formed within the device 5 and is in constant communication with the signal port 31 of the device 30 via the output port 13 .

Inside the negative pressure chamber 16, an iron core 17 made of a magnetic material is disposed in the axial direction of the second body 15.
A bobbin 18 made of a non-magnetic material is fixed on the top. A solenoid coil 19 is wound on the bobbin, and the coil 19 is connected via a lead wire 20 to a suitable input power source for generating a duty signal. Further, a support member 21 having an L-shaped cross section is fixed to the iron core 17, and a movable plate 22 is disposed at the upper end of the support member 21 in the drawing so as to be rotatable about the support member 21 as a fulcrum. The movable plate 2
A first valve 23 and a second valve 2 are installed at both ends of the valve 2, respectively.
4 is fixed, the first valve 23 controls the opening and closing of communication between the first input port 11 and the negative pressure chamber 16, while the second valve 24 controls the communication between the first input port 11 and the negative pressure chamber 16.
2 and the negative pressure chamber 16. The movable plate 22 is always subjected to the biasing force of the return spring 25, and rotates counterclockwise when the solenoid coil 19 is not energized.
The valve 23 is held in the closed position and the second valve 24 is held in the open position. When the solenoid coil 19 is energized, the movable plate 22 rotates clockwise from the illustrated position against the urging force of the spring 25 due to the excitation action of the coil 19, and is fixed to the upper end of the iron core 19 attracted to the iron core 19. As a result, the first valve 23 is held in the open position and the second valve 24 is held in the closed position.

The first input port 11 communicates with a pressure supply source, such as an intake manifold 40 of an automobile engine, and the second output port 12 communicates with an output port of a regulator valve, which will be described later.

The regulator valve 50 shown in the drawings includes an input port 51 and an output port 52.
The body 53 and a second body 55 provided with an atmospheric port 54 are integrally and airtightly coupled. The diaphragm 56 has its outer circumferential portion airtightly clamped between the bodies 53 and 55, and its inner circumferential portion is hermetically fixed to the diaphragm piston 57. A negative pressure chamber 58 is formed in the first body 53 and an atmospheric chamber 59 is formed in the second body 55, with the diaphragm 56 and the piston 57 as boundaries.
The negative pressure chamber 58 is always in communication with the second input port 12 of the negative pressure switching valve 10 mentioned above via the output port 52,
The atmospheric chamber 59 is in constant communication with an atmospheric source via the atmospheric port 54. Further, the input port 51 is always in communication with the above-mentioned intake manifold 40 and is also in communication with the negative pressure chamber 58 via a passage inside the pipe 60.

A spring 62 whose one end is secured to a retainer 61 is tensioned in the negative pressure chamber 58 .
The diaphragm piston 57 is always urged downward in the drawing by the other end. A poppet valve 63 disposed inside the diaphragm piston 57 is normally held in the closed position as shown in the figure, and the poppet valve 63 is disposed inside the diaphragm piston 57.
1 and a negative pressure chamber 58 are in communication. Input port 51
When the negative pressure introduced into the negative pressure chamber 58 increases and reaches a predetermined pressure, the diaphragm piston 57 moves upward in the figure against the urging force of the spring 62, and as a result, the valve 63 resists the urging force of the spring 64. Since it comes into contact with the lower end surface of the receiving pipe 60, the valve 6
3 is held in the closed position and connects the input port 51 and the negative pressure chamber 5.
Communication with 8 is cut off. Conversely, when the negative pressure in the negative pressure chamber 58 decreases, the valve 63 is held at the open position, and when the negative pressure reaches a predetermined value, the valve 63 is held at the closed position. In this way, the regulator valve 50 cuts off the negative pressure introduced from the intake manifold 40 to the input port 51 to a predetermined value and maintains it at a constant value, and the negative pressure introduced from the output port 52 to the second negative pressure switching valve 10.
It is supplied to the input port 12.

The magnitude of the negative pressure supplied from the output port 52 of the regulator valve 50 to the negative pressure switching valve 10 is determined by the magnitude of the load on the spring 62, and this load is controlled by the adjuster screw 65. Adjustable.

The operation of the above configuration will be described next. Now, intake manifold 40 is -400
It is assumed that a negative pressure of mmHg is generated and the device 30 operates at a negative pressure of -100 mmHg for valve closing/opening operation. When the load of the spring 62 is adjusted so that the regulator valve 50 generates a negative pressure of -100 mmHg, the first input port of the negative pressure switching valve 10 generates a negative pressure of -400 mmHg, and the second input port generates a negative pressure of -100 mmHg. will be subjected to negative pressure. Therefore, as shown in the figure, when the solenoid coil 19 is de-energized, the negative pressure switching valve 10 closes the first valve 23 and opens the second valve 24, so that a negative pressure of -100 mmHg is applied to the output port 13.
is supplied to the device 30 from The negative pressure supplied to the device 30 from the output port 13 depends on the duty when the solenoid coil 19 is energized and de-energized, and as the duty increases and approaches 100% as shown in FIG.
The negative pressure increases proportionally. That is, negative pressure can be supplied to the device 30 from the output port 13 in proportion to the duty, and the operation of the device 30 can be controlled accurately and reliably.

FIG. 3 shows a second embodiment of the device control apparatus according to the present invention, in which the same negative pressure control valve as in the first embodiment is used. The regulator valve 70 shown in the drawing includes a first body 72 having a first output port 71 and an input port 7.
3 and a second body 75 with a second output port 74
and a third body 77 provided with an atmospheric port 76 are integrally and airtightly coupled. 1st
The diaphragm 78 has an outer peripheral portion that is connected to the first body 7.
The inner periphery of the first diaphragm piston 80 is hermetically clamped between the first diaphragm piston 80 and a support member 81 fixed to the piston 80. The second diaphragm 79 is
Its outer circumferential portion is airtightly clamped between the second body 75 and third body 77, and its inner circumferential portion is airtightly clamped between the second diaphragm piston 82 and a support member 83 fixed to the piston 82. It's tied up.
A first negative pressure chamber 84 is formed in the first body 72 by the first diaphragm 78, a second negative pressure chamber 85 is formed in the second body 73 by the second diaphragm 79, and an atmospheric chamber 86 is formed between the two diaphragms 78 and 79. are formed respectively. The first negative pressure chamber 84 is connected to the first output port 7
1 to the first input port 11 of the negative pressure switching valve 10
The second negative pressure chamber 85 is always in communication with the second input port 12 of the negative pressure switching valve 10 through the second output port 74, and the atmospheric chamber 86 is in constant communication with the atmospheric source through the atmospheric port 76. . In addition, the input port 73 is the first
Constant communication with the intake manifold of the example,
and passages 72a, 75a, 77a formed in the first, second, and third bodies 72, 75, 77;
It communicates with the first negative pressure chamber 84 via the internal passage of the valve 87, and at the same time communicates with the second negative pressure chamber 85 via the internal passage of the second pipe 88.

A first spring 90 whose one end is locked to a retainer 89 is disposed in the first negative pressure chamber 84 , and the other end of the spring 9 allows the first diaphragm piston 8 to
0 is always biased downward in the drawing. The first valve 91 disposed inside the first support member 81 is held in the open position as shown in the figure when the negative pressure in the first negative pressure chamber 84 is small, and the first valve 91 is connected to the input port 73 and the first negative pressure chamber 84.
4 are connected. When the negative pressure in the first negative pressure chamber 84 increases and reaches a first predetermined value, the diaphragm piston 80 moves upward in the figure against the biasing force of the spring 90, and as a result, the first valve 91 Since the first valve 91 receives the force and comes into contact with the lower end surface of the first pipe 87, the first valve 91 is held in the closed position and communication between the input port 73 and the first negative pressure chamber 84 is cut off. Conversely, when the negative pressure in the first negative pressure chamber 84 decreases, the first valve 91 is held in the open position, and negative pressure is introduced into the first negative pressure chamber 84 from the input port 73 again.
When the negative pressure in the first negative pressure chamber 84 reaches a first predetermined value, the first valve 91 is held in the closed position. In this way, the first valve 91 cuts off the negative pressure from the intake manifold 40 introduced from the input port 73 to a predetermined value and maintains it at a constant value, and the first valve 91 connects the negative pressure switching valve 10 from the first output port 71 to Input port 11
It is intended to supply

Similarly to the above, a second spring 94 whose one end is locked to a retainer 93 is disposed in the second negative pressure chamber 85, and the second diaphragm piston 82 is always urged upward in the figure by the other end of the spring 94. has been done. A second support member disposed inside the second support member 83
When the second negative pressure chamber 85 is small, the valve 95 is held in the open position as shown in the figure, and the input port 73 and the second negative pressure chamber 85 are in communication. When the negative pressure in the second negative pressure chamber 85 increases and reaches a second predetermined pressure, the diaphragm piston 82 moves downward in the figure against the biasing force of the spring 94, and as a result, the second valve 95 is moved by the biasing force of the spring 96. Since it receives the force and comes into contact with the upper end surface of the second pipe 88, the second valve 95
is held in the closed position, and communication between the input port 73 and the second negative pressure chamber 85 is cut off. Conversely, the second negative pressure chamber 85
When the negative pressure in the second negative pressure chamber 85 decreases, the second valve 95 is held in the open position, and the negative pressure is again introduced into the second negative pressure chamber 85 from the input port 73, and the negative pressure in the second negative pressure chamber 85 is reduced to the second negative pressure chamber 85.
When the predetermined value is reached, the second valve 95 is held in the closed position. In this way, the second valve 95 connects the intake manifold 40 introduced from the input port 73.
The negative pressure from the negative pressure is cut off to a predetermined value, held at a constant value, and supplied from the second output port 74 to the second input port 12 of the negative pressure switching valve 10.

Note that the regulator valve 70 is the negative pressure switching valve 10.
The constant negative pressure values supplied to the first input port 11 and the second input port 12, that is, the first predetermined value and the second predetermined value, are supplied to the first and second springs 9, respectively.
0 and 94, and these loads can be adjusted by adjustment screws 97 and 98, respectively.

In the second embodiment of the above configuration, its operation will next be explained based on FIG. 4. Now, a negative pressure of P ₀ is generated in the intake manifold, and this negative pressure
1st from intake manifold 70 which received P ₀
A negative pressure of a predetermined value P ₁ is supplied to the first input port 11 of the negative pressure switching valve 10, and at the same time, a negative pressure of a second predetermined value P ₂ is supplied to the second input port 12. here,
Assuming that the negative pressure value P ₁ is greater than the negative pressure value D ₂ , the first valve 23 is closed and the second valve 24 is opened as shown in FIG. 3 when the solenoid valve 19 is de-energized.
When the duty is 0%, a negative pressure value _P2 is generated at the output port 13. And solenoid coil 1
9 duty when energized and de-energized increases,
As the duty approaches 100%, the negative pressure at the output port 13 increases proportionally as shown in Fig. 4, approaches the negative pressure value _P1 , and when the duty reaches 100%, the
A negative pressure value P ₁ occurs. Therefore, device 30
When the operating negative pressure of is between P ₁ and P ₂ , an invalid control range occurs on the large duty side in the first embodiment, but in the second embodiment, the invalid control range occurs on the large duty side. The effective control range of can also be increased.

As detailed above, in the device control device according to the present invention, the first
A negative pressure switching valve 1 that alternately switches and introduces negative pressure supplied to an input port 11 and a second input port 12 and supplies the output pressure to a device 30 from an output port 13.
0, and regulator valves 50 and 70 that cut off the input pressure supplied to at least one of the first and second input ports 11 and 12 of the negative pressure switching valve 10 to a predetermined value and maintain it at a constant value. Therefore, the effective control range for controlling the operation of the device can be increased and the control performance can be greatly improved, and the operation of the device can be accurately and reliably controlled.

[Brief explanation of the drawing]

FIG. 1 is a graph showing the relationship between duty and output pressure of device control devices in the conventional device and the present invention, FIG. 2 is a graph showing the first embodiment of the present invention, and FIG.
The figure shows the second embodiment of the present invention, and FIG.
It is a graph showing the relationship between duty and output pressure in an example. 10: Negative pressure switching valve, 11: First input port, 1
2: Second input port, 13: Output port, 19:
Solenoid coil, 22: Movable plate, 23:
1st valve, 24: 2nd valve, 30: device, 40: intake manifold, 50: regulator valve, 51: input port, 52: output port, 56: diaphragm, 57: diaphragm piston, 63: valve, 70 : Regulator valve, 71: First output port, 73: Input port, 74: Second output port, 78, 79: Diaphragm, 80, 82: Diaphragm piston, 9
1: first valve, 95: second valve.

Claims (1)

[Claims] 1. A switching valve that alternately switches and introduces the input pressure supplied to the first input port and the second input port according to the duty signal, controls the pressure, and supplies the output pressure from the output port to the device. , a regulator valve that cuts off the input pressure supplied to at least one of the first input port and the second input port of the switching valve to a predetermined value and maintains it at a constant value. . 2. In the device control apparatus according to claim 1, the regulator valve communicates with a diaphragm piston that is actuated and displaced in response to input pressure supplied to an input port, and communicates with the piston to control the input pressure. comprising a valve that cuts off communication between the input port and the output port when the pressure reaches a predetermined value,
A device control device characterized in that the pressure supplied to either one of the first and second input ports of the switching valve is cut off to a predetermined value and maintained at a constant value. 3. In the device control device according to claim 1, the regulator valve includes a first diaphragm piston and a second diaphragm piston that are actuated and displaced in response to input pressure supplied to an input port; When the input pressure reaches a first predetermined value by communicating with the first piston, the input port and the first
a first valve that cuts off communication between the output ports; and a second valve that operates in conjunction with the second piston and cuts off communication between the input port and the second output port when the input pressure reaches a second predetermined value. The pressure supplied to the first input port of the switching valve is cut off to the first predetermined value, and the pressure supplied to the second input port of the switching valve is cut off to the second predetermined value and maintained at a constant value. A device control device characterized by: