WO2012093745A1

WO2012093745A1 - Pneumatic circuit system of an air spring for a vehicle and method for controlling the pneumatic circuit

Info

Publication number: WO2012093745A1
Application number: PCT/KR2011/000539
Authority: WO
Inventors: 오관범; 김차식; 조태영; 변경원
Original assignee: 주식회사 인팩
Priority date: 2011-01-07
Filing date: 2011-01-26
Publication date: 2012-07-12
Also published as: KR101041554B1

Abstract

The present invention relates to a pneumatic circuit system of an air spring for a vehicle and a method for controlling the pneumatic circuit. The pneumatic circuit system includes: a compressor (3) for suctioning and compressing external air; a dryer (5) for removing moisture from the air compressed by the compressor (3); a one-way valve (7) allowing the air transferred from and dried by the dryer (5) to pass therethrough, thereby introducing the air into the air spring (10), the one-way valve (7) preventing the air introduced into the air spring (10) from passing therethrough, thereby exhausting the air introduced into the air spring (10) toward the dryer (5); a switching valve (9) that is closed when the air is introduced into the air spring (10) so that the air is introduced through a pipe (c), the switching valve (9) being opened when the air is discharged from the air spring (10) so that the air is discharged through the pipe (c); a throttle valve (11) throttling the air discharged from the air spring (10) to remove moisture within the dryer (5); and an exhaust valve (13) opened to discharge the air passing through the throttle valve (11) to the atmosphere. Thus, since the one-way valve is disposed on the pipe in which the air is filled from the compressor to the air spring, the air supplied from the compressor may be directly filled into the air spring without passing through the switching valve. Accordingly, the pipe for filling the air into the air spring may be further simplified in structure.

Description

Pneumatic circuit system and pneumatic circuit control method for vehicle air spring

The present invention relates to a pneumatic circuit system and a pneumatic circuit control method of a vehicle air spring, and more particularly, to a pneumatic circuit system for filling or discharging the outside air to the air spring used to control the vehicle's height and It relates to a control method that can effectively control the parts.

In general, a vehicle uses an air spring to control the garage. When the vehicle is to be raised, the vehicle is operated to supply pressurized air to the air spring by releasing the pressure in the air spring when the vehicle is stopped. Lower the garage

As an example of the pneumatic circuit used to control the garage by the air spring is the pneumatic circuit shown in FIG. As shown by reference numeral 101, the pneumatic circuit operates the compressor 103 by receiving power from the vehicle when the air spring 111 is to be operated, and the air pressurized by the operation is drier 105. Water is removed while passing through the respective opening and closing valves 109 through the one-way valve 107 is filled with each air spring 111 after the water is removed. On the contrary, when the air spring 111 is to be stopped, the air filled in the air spring 111 is opened by the on / off valve 109 to pass through the on / off valve 109 and the throttling valve 113 to exhaust the valve. It is discharged to the atmosphere through the 115, the operation of the on-off valve 109, the exhaust valve 115 and the like is controlled by the controller 117.

However, the conventional air spring pneumatic circuit 101 as described above opens the on / off valve 109 when the compressed air is filled in the air spring 111 so that the compressed air passes through the on / off valve 109, the air spring Filling control for (111) has a disadvantage that can not be carried out immediately and concisely.

In addition, the pneumatic circuit 101 is not able to determine the state of the air filled with the air spring 111, that is, the pressure, it is possible to continue to operate the compressor 103 to reach the target pressure, thereby operating loss and parts There was also a problem that caused a shortening of the service life.

In addition, even if the pressure sensor is installed on the conduit to the air spring 111 in relation to the above, the air compressed in the compressor 103 passes through the dryer 105, the one-way valve 107, the on-off valve 109 This may cause, there was also a problem that can not measure the correct pressure at the inlet side of the air spring (111).

In addition, when the compressor 103 is excessively operated because the filling pressure of the air spring 111 is not confirmed as described above, the compressor 103 as well as the driving motor for driving the compressor 103 generate excessive heat to generate adjacent heat. Parts, in particular, various packing materials made of rubber are thermally affected, causing damage or failure.

In addition, when the air spring 111 is not filled at the proper pressure due to a minor cause on the pneumatic circuit 101, the compressor 103 and the driving motor do not stop the operation as well, the above problems occur due to heat generation as well. In addition, due to excessive operation, the lifespan of the drive-related parts such as the compressor 103 is shortened, and there is a problem of easily causing a failure.

The present invention has been made to solve the above conventional problems, by simplifying the configuration of the pipelines and valves of the pneumatic circuit for filling / exhausting air in the air spring, by allowing the temperature and pressure in the system to be detected, the compressor It aims to improve the life span or performance of the system by preventing overload of the driving motor or other parts and the damage or failure thereof.

The present invention to achieve the above object is a compressor for sucking and compressing the outside air; A dryer for removing moisture from the compressed air in the compressor; It is installed between the pipe connecting the dryer and the air spring, allowing the air dried out from the dryer to pass into the air spring, but blocking the air flowing into the air spring to be exhausted to the dryer side. One way valve; One end is installed on the pipeline between the air spring and the one-way valve, the other end is connected to each other on the pipeline between the one-way valve and the dryer, and closed when the air is introduced into the air spring. Opening valve so that the air is introduced through, but when the air flows out from the air spring is opened to open the air through the pipe; An throttling valve installed in a conduit connecting the one end of the conduit on the conduit and the dryer by bypass to condense the air flowing out of the air spring; And an exhaust valve installed on a conduit connected to the conduit between the dryer and the compressor, the exhaust valve being opened to discharge the air passing through the throttling valve to the atmosphere.

In addition, it is connected on the conduit between the one-way valve and the air spring, before the air passing through the one-way valve flows through the one-way valve from the compressor through the dryer to the air spring before entering the air spring. It is preferable to further include an attenuator to attenuate.

In addition, a relief valve connected between one end of the conduit on the conduit and the other end of the conduit on the conduit to open when the pressure of the air passing through the dryer is greater than or equal to a predetermined set pressure to release the pressure applied to the conduit to the outside. It is preferable to further include.

In addition, it is preferable that the pressure sensor further connected to the pipe to measure the pressure of the air pulsation is reduced by passing through the attenuator.

In addition, preferably connected to the compressor further comprises a temperature sensor for sensing the temperature of the compressor.

In addition, the conduit is a one-way valve for the air flowing out of the conduit flows through the throttling valve only through the conduit to the exhaust valve, the conduit flows the air flowing out of the dryer to the air spring only through the conduit It is preferable to further include a one-way valve to each.

In addition, it is preferable to further include an attenuation and heater installed at a point adjacent to the dryer on the pipe, heating the air compressed and discharged by the compressor at the same time as attenuation.

In addition, the damping and heater, the cylinder forming an outer body; A plurality of attenuation plates arranged in succession at intervals from an inlet side to an outlet side of the cylinder, the one or more apertures being perforated to attenuate air flowing in the cylinder; A heat transfer layer formed on a surface of the cylinder and the damping plate in contact with air flowing in the cylinder; And a power supply for feeding the heat transfer layer.

The present invention also includes a compression step of sucking the air in the atmosphere by the compressor (3); A drying step of removing water remaining in the air by passing the air compressed in the compression step through a dryer; And a filling step of filling the air dried in the drying step into the air spring through the one-way valve, and the air filled in the air spring in the filling mode, by opening and closing a valve from the air spring. A pressure reduction step of discharging; A dryer regeneration step of removing water from the dryer by passing air discharged from the air spring through the throttling valve in the depressurization step; And an exhausting step of exhausting the air from which the dryer is regenerated in the dryer regeneration step to the atmosphere through an exhaust valve to the atmosphere of the vehicle.

In addition, the filling mode is attenuated by an attenuator connected to the conduit between the one-way valve and the air spring before the air dried in the drying step is filled into the air spring through the one-way valve in the filling step. It is preferred that the compressor further comprises a damping step of removing the pulsation that has been during the passage through the one-way valve from the compressor.

Further, when the pressure of the air passing through the dryer reaches a set pressure before passing through the one-way valve, the pressure applied to the pipe is transferred to the outside by a relief valve connected to the pipe between one end of the pipe and the one-way valve. It is preferred to be discharged.

In addition, it is preferable that the pressure of the air attenuated in the attenuation step is detected by a pressure sensor connected to the conduit between the attenuator and the air spring.

Further, when the air spring filling pressure sensed by the pressure sensor in the filling step does not reach a target set pressure within a set filling time, the operation of the compressor is stopped to end the filling of the air spring into the air spring. It is preferable.

In addition, the filling target set pressure of the air spring is preferably in the range of 1 to 20bar.

In addition, when the temperature detected by the temperature sensor connected to the compressor is higher than the set temperature, it is preferable to stop the operation of the compressor to end the air filling to the air spring.

In addition, the set temperature is preferably in the range of -40 to 150 ℃.

In addition, the filling mode is passed through the attenuation and heater on the conduit before passing the air compressed in the compression step into the dryer in the drying step, while passing through the one-way valve between the compressor and the compressor and the dryer. It is preferable to further include a damping and heating step of attenuating the pulsations possessed and heating.

1 is a schematic view showing a conventional vehicle air spring pneumatic circuit system.

Figure 2 is a schematic diagram showing a vehicle air spring pneumatic circuit system according to the present invention.

3 is a detailed view of the damper and heater shown in FIG.

Figure 4 is a block diagram showing a vehicle air spring pneumatic circuit control method according to the present invention.

FIG. 5 is a detailed flowchart illustrating a method of controlling a vehicle air spring pneumatic circuit shown in FIG. 4.

Hereinafter, a pneumatic circuit system of a vehicle air spring according to an embodiment of the present invention will be described with reference to the accompanying drawings.

The pneumatic circuit system of the present invention has a compressor 3, a dryer 5, a one-way valve 7, an open / close valve 9, an throttling valve 11, and an exhaust valve as shown in FIG. 2. (13), each of these elements is connected via a conduit (a, b, c, d, e, f), and controlled by the control unit 20, respectively, attenuator (15), relief valve ( 17), the pressure sensor 19, the damping and heater 21, the temperature sensor 24 and the like is further configured.

Here, the compressor (3) is a means for sucking and compressing outside air in the air into the system of the pneumatic circuit system 1, and is operated by the drive motor 25 as shown in FIG. Compress outside air introduced through. At this time, the drive motor 25 is controlled on and off by the controller 20, the temperature of the compressor (3) can be measured by the temperature sensor 24, the general operating warranty temperature of the vehicle parts average -40 to On the other hand, since the compressor 3 starts to operate and heat is generated by the compression and friction of the cylinder part, the average temperature is extended to -40 to 150 ° C.

The dryer 5 is a means for removing moisture remaining in the compressed air through the compressor 3, and is connected to the outlet of the compressor 3 through a pipeline a as shown in FIG. On (a), there is provided a one-way valve 33 that allows the flow of air flowing from the compressor 3 to the dryer 5, while blocking the air flow from the dryer 5 to the compressor 3.

The one-way valve (7) allows the intake air to flow into the air spring 10 through the conduit (c), but the air filled in the air spring 10 does not flow out to the exhaust side through the conduit (c) As a means of preventing it, it is installed between the pipeline (b) and the pipeline (c) connecting the dryer 5 and the air spring 10 as shown in FIG. Therefore, the air dried in the dryer 5 is filled through the one-way valve 7 into the air spring 10, but the air filled in the air spring 10 cannot pass through the one-way valve 7. The state of filling the air spring 10 is maintained unless the on-off valve 9 is opened.

The on-off valve 9 is a means for controlling the air discharge of the air spring 10, one end is connected to the conduit c between the air spring 10 and the one-way valve 7 as shown in FIG. When the air flows into the air spring 10, the air pipe 10 is installed on the pipe line d connected to the other end on the pipe line b between the one-way valve 7 and the dryer 5. The air passing through 7) is introduced only along the pipe line (c), but is open to exhaust the air filled in the air spring (10) so that the air can only flow out through the pipe line (d). At this time, the opening and closing valve 9 is a two-position two-way solenoid valve, as shown in Figure 2, the flow path is opened by the solenoid excited in the energized state, the flow path is closed by the spring repulsive force in the disconnection state The flow of air by the pipeline d is regulated.

The throttling valve 11 is a means for regenerating the dryer 5, and as shown in FIG. 2, the throttling valve 11 is installed in the pipeline e branched from the pipeline b so that one end of the pipeline d and the dryer ( 5) to bypass the connection, and removes the moisture of the dryer (5) by throttling the air flowing out of the air spring (10) through the on-off valve (9).

The exhaust valve 13 is a means for discharging the air discharged from the air spring 10 into the atmosphere, as shown in FIG. 2, connected to a conduit a between the dryer 5 and the one-way valve 33. It is installed on the pipe line f. Therefore, it is normally closed in the disconnection state, and when it is energized, the air passing through the throttling valve 11 is discharged to the atmosphere through the exhaust port 29.

On the other hand, the attenuator 15 is a means for removing the pulsation of the air passing through the one-way valve 7 before entering the air spring 10, as shown in Figure 2, passing through the one-way valve (7) One air is removed from the compressor (3) through the dryer (5) to pass through the one-way valve (7) to remove the pulsation, the pipe (c) between the one-way valve (7) and the air spring (10) Is connected to.

As shown in FIGS. 2 and 5, the relief valve 17 is a means for releasing when the air pressure p above the set pressure P is applied to the pipe line b, and passes through the dryer 5. (b) is opened when the air pressure (p) applied to the set pressure (P) is greater than the set pressure (P) to release the air pressure (p) on the pipeline (b) to the atmosphere, for this purpose of the pipeline (d) connected to the pipeline (b) It may be connected to any position between one end and the other end of the pipeline (d) connected to the pipeline (c).

The pressure sensor 19 is a means for measuring the air pressure immediately before being filled with the air spring 10, as shown in Figure 2, is connected to the pipeline (c), the one-way valve 7 and the attenuator ( After passing through 15), it is to measure the pressure of the air in a stable state such as pulsation is removed.

The damping and heater 21 is a means for simultaneously heating the air compressed and discharged from the compressor 3 and attenuating it. As shown in FIG. 2, the dryer 5 is adjacent to the dryer 5 on the pipeline a. Bar is installed at a point between the connecting portion (f) and the bar, so that the compressed air discharged from the compressor 3 passes through the one-way valve 33 and is heated simultaneously with the decay immediately before being introduced into the dryer 5.

To this end, the damping and heater 21 is configured to include a cylinder 41, a plurality of damping plate 43, an electric heating layer, and a power source 45, as shown in more detail in FIG. First, the cylinder 41 is a cylindrical container, which forms the outer body of the damping and heater 21. In addition, the plurality of damping plates 43 are continuously arranged in the cylinder 41 in a state where they are spaced apart from each other, and the air is introduced into the inlet 47 of the cylinder 41 and flows out to the outlet 48. It is a portion to damp the pulsation, and is formed in a disc or cylindrical shape as shown, and one or more large and small through holes 51 are perforated as a whole. At this time, each attenuating plate 43 may be manufactured in a variety of forms, as well as can be installed to have a variety of combinations or arrangement, as an example thereof as shown in Figure 3 a plurality of perforated plate perforated (43-1) and a hollow plate (43-2) having a large through hole in the center are alternately arranged in the axial direction, the porous cylinder (43-3) is connected to the central through hole downstream of the hollow plate (43-2) It can be produced as. At this time, the porous cylinder 43-3 may be omitted. In addition, the heat transfer layer is an electric heat generating layer formed on the surfaces of the cylinder 41 and the damping plates 43 in contact with the air flowing into the cylinder 41, and generates heat when the power is supplied by the power source 45. The air passing through 41 is attenuated and heated at the same time, and when the temperature sensed by the temperature sensor 31 is higher than the set temperature, the power supply 45 may be turned off to stop air heating by the heating layer. In this way, the heat transfer layer is formed by coating a plurality of conductive nanoparticles on the surfaces of the cylinder 41 and the damping plate 43 in contact with the air passing through the heater 21 in order to generate heat when power is applied. The nanoparticles are formed by doping aluminum or the like on an oxide such as zinc oxide like the known heat transfer layer.

The temperature sensor 24 is a means for sensing the temperature of the compressor 3, which is connected to one side of the compressor 3, as shown in FIG. 2, the compressor 3 as well as the deterioration adjacent to the compressor 3 It is designed to detect the temperature of the part.

Finally, the one-way valve 22 is installed between the pipe line (f) connection of the pipe line (b) and the pipe line (d) connection, the bypass connection between the pipe line (f) and the pipe line (d) connection of the pipe line (b) The one-way valve 23 is installed on the pipe line (e), and the air pipe (b) passes through the throttle valve (11) only through the pipe (e) due to the air flowing out of the pipe (d) by the one-way valve (22). On the contrary, the pipeline (e) allows the air flowing out of the dryer (5) to flow into the air spring (10) only through the pipeline (b) due to the one-way valve (23).

Now, the control method of the pneumatic circuit system of the vehicle air spring according to the present invention configured as described above is as follows.

As shown in FIG. 4, the control method of the pneumatic circuit of the present invention includes a filling mode M10 and an exhaust mode M20, and the filling mode M10 is again compressed (S10) and dried (S20). , And filling step (S30), and the exhaust mode (M20) is further configured to include a depressurization step (S40), regeneration step (S50), exhaust step (S60), further attenuation step (S70). Include.

Here, the first compression step (S10) of the filling mode (M10) is a step of sucking the air in the atmosphere through the inlet port 27 and compressing by the compressor (3), in this step (S10) shown in FIG. As described above, when the driving motor 25 is operated according to the command of the controller 20, the compressor 3 is driven to suck and compress air to be filled in the air spring 10 from the atmosphere through the inlet port 27. The air compressed by the compressor 3 is introduced into the dryer 5 through the one-way valve 33 along the pipeline a, but the exhaust valve 13 is closed in a non-operational state. It does not flow into f).

At this time, when the temperature sensed by the temperature sensor 24 is less than the set temperature, the following drying step (S20) is performed, but when the set temperature is exceeded, the operation of the compressor 3 is stopped and air is supplied to the air spring 10. Turn off the operation of the pneumatic circuit system (1) for filling. At this time, the set temperature is -40 to 150 ℃ the average of the operation guarantee temperature of the vehicle parts, -40 to 150 in consideration of the fact that the heat generated by the friction of the cylinder inside the compressor (3) when the compressor 3 starts to operate It is preferable to make it into the appropriate temperature range up to ° C.

The drying step (S20) is a step of drying the air compressed in the above compression step (S10) through a dryer (5), in this step (S20), as shown in Figure 2, the dryer along the pipeline (a) (5) Remove any water remaining in the compressed air introduced into.

The filling step (S30) is a step of filling the air dried in the above drying step (S20) into the air spring 10, as shown in Figure 2 and 5 in this step (S30), the dryer (5) The dry air discharged from the air passes through each one-way valve 22 along at least one pipe line b, and then passes through the one-way valve 7 to be directly filled with the air spring 10 without passing through the open / close valve 9. do.

At this time, the controller 20 checks the air pressure p of the air spring 10 and compares it with the set pressure P as shown in FIG. 5. As a result, the measured air pressure p is the target set pressure P. ), The pressure of the air spring 10 is maintained at the set pressure P, and when the measured air pressure p is greater than the set pressure P, the pressure is released to the outside through the relief valve 17. At this time, the target set pressure (P) is preferably in the range of 1 to 20bar, the pressure of more than 20bar is more than the normal filling pressure of the compressor (3), it is not suitable as the filling pressure of the air spring (10). .

On the other hand, if the measured air pressure p is smaller than the set pressure P, the compressor 3 is operated to check the time t elapsed since the start of filling, and compare it with the set time T set to 60 seconds, for example. . As a result, when the time taken until the air spring 10 is filled with air exceeds the set time T, it is regarded that there is an abnormality among the components constituting the pneumatic circuit system 1, and the operation of the driving motor 25 is stopped. By stopping the drive of the compressor 3, air charging to the air spring 10 is terminated, and the system 1 is turned off. On the contrary, if the filling time t has not yet reached the set time T, the measurement is performed while the air filling time to the air spring 10 is further elapsed until the measured air pressure p reaches the target set pressure P. The comparison between the air pressure p and the target set pressure P is repeated.

Accordingly, when the measured air pressure p reaches the target set pressure P, the driving of the compressor 3 is stopped to set the pressure of the air spring 10 until the on-off valve 9 is opened. Keep).

On the other hand, the depressurization step (S40) of the exhaust mode (M20) is the step of extracting the air filled in the filling mode (M10) in the air spring 10, in this step (S40) in the state shown in FIG. By energizing the solenoid of the valve 9 to bring the on-off valve 9 into an operating state, that is, an open state, the air filled in the air spring 10 is discharged to depressurize the air spring 10.

The dryer regeneration step (S50) is a step of removing the moisture of the dryer 5 by using the air discharged from the air spring 10 in the above decompression step (S40), in this step (S40) as shown in FIG. Likewise, the air discharged from the air spring 10 and passed through the open / close valve 9 opened along the pipe line d passes through the pipe line b and the pipe line e to the throttle valve 11. At this time, the air moved from the conduit (d) to the conduit (b) is no longer able to flow along the conduit (b) due to the one-way valve 22, but through the one-way valve (23) through the conduit (e) Accordingly, it can be introduced into the throttling valve (11).

The air passing through the throttling valve 11 in this way removes the water retained by the dryer 5 by using the high-speed dry air generated when it moves from the high pressure section to the low pressure section while passing through the throttling valve 11. Regenerate the dryer 5 when it is next charged.

The exhaust step (S60) is a step of discharging the air passing through the throttling valve 11 in the air in the dryer regeneration step (S50) to the atmosphere, in this step (S60) as shown in FIG. The exhaust valve 13 is opened so that the air passing through the throttling valve 11 can be discharged to the exhaust port 29 along the pipe line f while being regenerated. To this end, the control unit 20 energizes the solenoid of the exhaust valve 13 to open the exhaust valve 13 in an operating state, thereby completing the operation of the air spring 10 in one cycle.

On the other hand, the attenuation step (S70) is a step to attenuate the air filled in the air spring 10 in the filling step (S30), in this step (S70) the air dried in the drying step (S20) compressor (3) The pulsation obtained during passing through the dryer 5 through the one-way valve 7 is attenuated by the attenuator 15 before being filled with the air spring 10. Accordingly, since the pulsation on the pipe line (c) is removed, the pressure at the inlet side of the air spring 10 by the pressure sensor 19 can be more stably measured.

In addition, the attenuation and heating step (S80) is a step of heating at the same time as the decay immediately before the air compressed in the above compression step (S10) to the dryer 5 in the drying step (S20), this step (S80) In the air passing through the compressed and discharged from the compressor (3) to the attenuator and heater 21 on the conduit (a), the air is compressed by the compressor (3), which may occur in the process of passing through the one-way valve 33 To dampen pulsations. That is, the air flowing into the attenuation and heater 21 inlet 47 along the pipeline a is passed through the porous cylinder 43-3, the porous plate 43-1, and the hollow plate 43-2. ) Alternately pass kinetic energy due to pulsation is reduced. As such, the air attenuated through the cylinder 41 and the damping plate 43 is heated at the same time as the attenuation in contact with the heat transfer layer to which the power source 45 is applied and generates heat, and thus the moisture of the air is evaporated. It becomes possible to perform the drying step (S20) to be dried by 5) more efficiently.

Therefore, according to the pneumatic circuit system and the pneumatic circuit control method of the vehicle air spring of the present invention, by installing a one-way valve on the conduit from the compressor to the air spring, the air supplied from the compressor does not pass through the on-off valve directly the air spring In addition to being able to be filled in, while controlling the flow or not by the on-off valve during exhaust, it is possible to change the pipe structure for filling the air spring in the air simpler and simpler than in the prior art.

In addition, since the air pressure on the air spring inlet side pipe can be checked at any time by the pressure sensor, it is possible to optimize the operation control of the compressor, thereby preventing operation loss or shortening of life due to excessive operation of the compressor and the driving motor. You can do it.

In addition, in detecting the pressure of the air spring inlet pipe by the pressure sensor, the pulsation of the air on the pipe can be attenuated by the damper, so that the air pressure can be measured more accurately, and thus the operation of the compressor and the driving motor is performed. Control can be optimized.

In addition, the temperature sensor can check the heat generated in the compressor, drive motor, etc., and if the heat generation exceeds the proper level, the operation of the compressor and the drive motor can be stopped immediately. Can be prevented.

In addition, if the air spring cannot be filled normally due to a failure in the pneumatic circuit for any reason, the compressor and the driving motor are stopped immediately after a predetermined waiting time. For this reason, the compressor and the driving motor are not excessively operated for a long time, and thus, there is no need to worry about shortening the lifespan or failure of the drive-related components such as the compressor.

Finally, by attenuating and heating the air compressed by the compressor with the damper and heater at the same time before drying the dryer, the intake air can attenuate the pulsation caused by passing through the compressor and the one-way valve. By increasing the temperature of all the air it is possible to further improve the drying efficiency by the dryer.

Claims

A compressor for sucking and compressing outside air;

A dryer for removing moisture from the compressed air in the compressor;

It is installed between the pipelines (b, c) connecting the dryer and the air spring, allowing the air dried out from the dryer to pass into the air spring, but the air introduced into the air spring is exhausted to the dryer side. One-way valve to pass through to block;

One end on the pipe line (c) between the air spring and the one-way valve is installed on the pipe line (d) connected to the other end on the pipe line (b) between the one-way valve and the dryer, the air to the air spring When the inflow is closed so that the air flows through the conduit (c), when the air flows out of the air spring open and close the valve to allow the air to flow through the conduit (d);

A throttling valve is installed in a duct (e) bypassing the connection between one end of the duct (d) on the duct (b) and the dryer, the throttling valve is to remove the moisture of the dryer by throttling the air flowing out of the air spring ; And

And an exhaust valve installed on a pipeline (f) connected to a pipeline (a) between the dryer and the compressor, the exhaust valve being opened to discharge air passing through the throttling valve to the atmosphere. Pneumatic circuit system.
According to claim 1,

Connected on the conduit c between the one-way valve and the air spring, the pulsation flowed through the one-way valve from the compressor through the dryer through the one-way valve is introduced into the air spring. The pneumatic circuit system of the vehicle air spring further comprises a damper to attenuate before.
The method of claim 2,

It is connected between one end of the pipe line (d) on the pipe line (b) and the other end of the pipe line (d) on the pipe line (c), and is opened when the pressure of the air passing through the dryer is equal to or higher than a predetermined set pressure. A pneumatic circuit system for a vehicle air spring, further comprising a relief valve for releasing the pressure applied to (c, d) to the outside.
The method of claim 3, wherein

And a pressure sensor connected to the pipe line (c) to measure the pressure of the air in which the pulsation is attenuated by passing through the attenuator.
The method of claim 4, wherein

And a temperature sensor connected to the compressor to sense a temperature of the compressor.
The method according to any one of claims 1 to 5,

The pipeline (b) is a one-way valve for allowing the air discharged from the pipeline (d) to flow through the throttling valve to the exhaust valve only through the pipeline (e), the pipeline (e) is the air discharged from the dryer Each one of the pneumatic circuit system of the vehicle air spring further comprises a one-way valve for flowing to the air spring only through the pipe (b).
The method according to any one of claims 1 to 5,

And a damper and heater installed at a point adjacent to the dryer on the conduit (a) and simultaneously heating and attenuating the air compressed and discharged from the compressor.
The method of claim 7, wherein

The damping and heater,

Outer body;

A plurality of attenuation plates arranged in succession at intervals from an inlet side to an outlet side of the cylinder, the one or more apertures being perforated to attenuate air flowing in the cylinder;

An electric heating layer formed on a surface of the cylinder and the damping plate in contact with the air flowing through the cylinder; And

Power supply for feeding the heat transfer layer; Pneumatic circuit system of a vehicle air spring, characterized in that it comprises a.
A compression step of sucking air in the air and compressing the air by a compressor;

A drying step of removing water remaining in the air by passing the air compressed in the compression step through a dryer; And

A filling mode comprising: a filling step of filling the air dried in the drying step into the air spring through the one-way valve;

A depressurizing step of discharging air filled in the air spring in the filling mode from the air spring by opening and closing a valve;

A dryer regeneration step of removing water from the dryer by passing air discharged from the air spring through the throttling valve in the depressurization step; And

And exhausting the air regenerated by the dryer in the dryer regeneration step to the atmosphere through an exhaust valve. 2. The method of controlling a pneumatic circuit for a vehicle air spring comprising: an exhaust mode.
The method of claim 9,

The filling mode is attenuated by an attenuator connected on the conduit c between the one-way valve and the air spring before the air dried in the drying step is filled into the air spring by passing through the one-way valve in the filling step. And attenuating a step of removing pulsations which have occurred during the passage of the one-way valve from the compressor to the dryer.
The method of claim 10,

When the pressure of the air passing through the dryer reaches the set pressure before passing through the one-way valve, the pressure applied to the pipe (b) is transferred to the pipe (b) between one end of the pipe (d) and the one-way valve. A control method for a pneumatic circuit of an air spring for a vehicle, characterized in that to be discharged to the outside by a connected relief valve.
The method of claim 10,

And a pressure sensor connected to the conduit c between the attenuator and the air spring to detect the pressure of the air attenuated in the attenuation step.
The method according to any one of claims 9 to 12,

When the air spring filling pressure sensed by the pressure sensor in the filling step does not reach the target set pressure within the set filling time, the operation of the compressor is stopped to end the filling of the air spring into the air spring Pneumatic circuit control method of a vehicle air spring.
The method of claim 13,

The filling target set pressure of the air spring is in the range of 1 to 20bar pneumatic circuit control method for a vehicle air spring.
The method according to any one of claims 9 to 12,

When the temperature sensed by the temperature sensor connected to the compressor is higher than the set temperature, the operation of the compressor to stop the air charging to the air spring, characterized in that for stopping the air filling in the air spring.
The method of claim 15,

The set temperature is a pneumatic circuit control method of a vehicle air spring, characterized in that in the range of -40 to 150 ℃.
The method according to any one of claims 9 to 12,

In the filling mode, before the air compressed in the compression step is introduced into the dryer in the drying step, the filling mode passes through a damper and heater on the conduit a to pass through the one-way valve between the compressor and the compressor and the dryer. A method of controlling a pneumatic circuit for an air spring for a vehicle, characterized in that it further comprises attenuating and heating the damping of the pulsations.