JP2021155009A - Purge system and vehicle - Google Patents

Abstract

To provide a purge system which reduces the frequency of regeneration operation of a drying agent in an air dryer.SOLUTION: A purge system includes: a main tank; a compressor; an air dryer which has a purge valve and supplies, to the main tank, air discharged from the compressor; a governor which supplies an instruction pressure from the main tank and stops the supply of the instruction pressure according to a tank pressure as a pressure in the main tank; an electromagnetic valve which switches between the closing and the opening of piping connecting the governor and the purge valve; and a control section which allows the electromagnetic valve to close the piping when there is satisfied at least one of conditions that prescribed operation is detected, that the amount of the air supplied to the air dryer by the compressor in a prescribed period is determined to be less than a first threshold, and that a period of time from a time when the governor starts the supply of the instruction pressure until a time when the governor stops the supply of the instruction pressure is equal to or longer than a reference period of time.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to purge systems and vehicles.

In a system that supplies air used for the operation of air equipment such as an air brake (for example, Patent Document 1), air compressed by an air compressor is sent to an air dryer, and moisture and oil content in the compressed air in the air dryer is sent. Is removed, and the air from which water and oil have been removed is stored in the tank. A desiccant is provided inside the air dryer, and the desiccant removes water and oil in the air flowing into the air dryer.

The air dryer disclosed in Patent Document 1 includes a purge valve, and when air is supplied from the tank to the purge valve, the purge valve is opened and the inside of the air dryer is opened to the atmosphere. As a result, when the dried air inside the air dryer moves toward the atmosphere, the desiccant is regenerated by removing the water and oil absorbed by the desiccant in the air dryer.

Japanese Unexamined Patent Publication No. 8-301100

When the desiccant is regenerated, dirty air is discharged to the outside of the air dryer, which pollutes the ground and surrounding air. For example, in a bus equipped with a system for supplying air, the bus stops at a fixed position such as a stop, so if the desiccant is regenerated while the bus is stopped, it is discharged during the regenerating process. The fixed position is contaminated with the excess water and oil. In addition, a sound is generated when air is discharged to the outside of the air dryer.

In the system disclosed in Patent Document 1, a pressure governor is provided in the pipe connecting the tank and the purge valve, and the pressure governor supplies air to the purge valve and supplies air according to the pressure in the tank. Is switching the stop of. That is, the frequency of the desiccant regeneration operation depended on the operation of the pressure governor.

The present disclosure has been made in consideration of the above points, and an object of the present disclosure is to provide a purge system and a vehicle provided with a purge system that reduces the frequency of the desiccant regeneration operation in an air dryer.

One aspect of the purge system of the present disclosure includes a main tank, a compressor that discharges air, a purge valve, an air dryer that supplies the air discharged from the compressor to the main tank, and the inside of the main tank. The governor that supplies the indicated pressure from the main tank and stops the supply of the indicated pressure according to the tank pressure, which is the pressure of the above, closes the pipe connecting the governor and the purge valve, and opens the pipe. The electromagnetic valve to be switched, the detection of a predetermined operation, the determination that the amount of air supplied to the air dryer by the compressor during a predetermined period is less than the first threshold value, and the governor supplying the indicated pressure. When at least one of the time from the start time to the time when the governor stops supplying the indicated pressure is equal to or greater than the reference time is satisfied, the electromagnetic valve has a control unit that closes the pipe. Be prepared.

One aspect of the vehicle of the present disclosure comprises the purge system described above.

According to the present disclosure, it is possible to provide a vehicle provided with a purge system and a purge system that reduce the frequency of desiccant regeneration operations in an air dryer.

The figure which shows the main structure of the purge system provided in the vehicle which concerns on embodiment The figure explaining the drive start and drive stop of the compressor executed by the purge system according to the embodiment. A flowchart showing an example of control of a solenoid valve executed by the purge system according to the embodiment. The figure which shows the solenoid valve which concerns on the modification The figure which shows the solenoid valve which concerns on the modification

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

<Structure>
FIG. 1 is a diagram showing a main configuration of a purge system 1 included in a vehicle 100 according to an embodiment of the present disclosure. Hereinafter, the vehicle 100 will be described as being a large vehicle such as a bus or a truck.

The purge system 1 includes a compressor 11, a motor 12, an air dryer 13, a main tank 14, a governor 15, a solenoid valve 16, an indicator pressure detection unit 31, a flow rate sensor 41, an open / close detection unit 42, an operation detection unit 43, an output unit 50, and , The control unit 60 is provided.

The compressor 11 discharges the sucked air at a desired flow rate, and supplies the discharged air to the air dryer 13. The compressor 11 is an electric compressor driven by a motor 12.

The motor 12 drives the compressor 11 at a predetermined rotation speed under the control of the control unit 60.

The air dryer 13 removes water and oil contained in the air flowing out from the compressor 11, and supplies the air from which the water and oil have been removed to the main tank 14.

A desiccant D is arranged inside the air dryer 13. The desiccant D absorbs water and oil in the air that has flowed into the air dryer 13.

The air dryer 13 includes a purge valve 131, and when an indicated pressure is supplied to the purge valve 131, the air dryer 13 executes a regeneration process of the desiccant D, a so-called purge process. Here, the indicated pressure is air that triggers the air dryer 13 to execute the purge process, and is supplied from the main tank 14.

When the indicated pressure is supplied to the purge valve 131, the purge valve 131 is opened and the inside of the air dryer 13 is opened to the atmosphere. Then, the dry air inside the air dryer 13 removes the water and oil components absorbed by the desiccant D when it is discharged to the atmosphere. As a result, the desiccant D is regenerated.

The main tank 14 stores air from which water and oil have been removed by the air dryer 13. The air stored in the main tank 14 is supplied to air equipment (not shown) such as air brakes, air suspensions, equipment related to opening and closing doors, and equipment related to kneeling operation at appropriate timings.

The governor 15 is provided in a pipe connecting the main tank 14 and the purge valve 131. Hereinafter, the pipe connecting the main tank 14 and the purge valve 131 includes the governor downstream pipe 21 which is a pipe connecting the governor 15 and the purge valve 131. The governor 15 supplies the indicated pressure from the main tank 14 toward the solenoid valve 16 and stops the supply of the indicated pressure according to the pressure inside the main tank 14 (hereinafter referred to as the tank pressure). Note that supplying the indicated pressure means supplying the air in the main tank 14 to the governor downstream pipe 21. The indicated pressure is supplied to the purge valve 131 when the solenoid valve 16 opens the governor downstream pipe 21, and is not supplied to the purge valve 131 when the solenoid valve 16 closes the governor downstream pipe 21.

The governor 15 supplies the indicated pressure from the main tank 14 to the purge valve 131 when the tank pressure rises and reaches the pressure value Pt1, and supplies the indicated pressure to the purge valve 131 when the tank pressure drops to the pressure value Pt2. Is designed so that the air in the governor downstream pipe 21 is released to the atmosphere through the governor 15. The pressure value Pt1 is larger than the pressure value Pt2. For example, the pressure value Pt1 is 900 kPa and the pressure value Pt2 is 800 kPa. The pressure value Pt1 is, for example, the value of the tank pressure when the filling rate of air in the main tank 14 is 100%. The pressure value Pt2 is a pressure value that serves as a guide for executing the operation of supplying air to the main tank 14 by the compressor 11.

The operation of the governor 15 will be described in detail. The governor 15 includes a valve (not shown) that moves according to the tank pressure. When the tank pressure is low, the valve blocks the flow path between the main tank 14 and the governor downstream pipe 21, and the governor downstream pipe 21 is open to the atmosphere. When the tank pressure reaches Pt1, the valve moves to open the flow path between the main tank 14 and the governor downstream pipe 21 and block the flow path to the atmosphere. As a result, the indicated pressure is supplied from the main tank 14 to the governor downstream pipe 21. Further, when the tank pressure drops to Pt2, the valve returns to the position where the flow path between the main tank 14 and the governor downstream pipe 21 is blocked. As a result, the supply of the indicated pressure from the main tank 14 to the governor downstream pipe 21 is stopped, and the air in the governor downstream pipe 21 is released to the atmosphere via the governor 15.

The solenoid valve 16 is provided in the governor downstream pipe 21 and switches between opening and closing of the governor downstream pipe 21 under the control of the control unit 60. When the solenoid valve 16 opens the governor downstream pipe 21, the purge system 1 is in a state where the indicated pressure can be supplied to the purge valve 131, and when the solenoid valve 16 closes the governor downstream pipe 21, the purge system 1 Reference numeral 1 denotes a state in which the indicated pressure cannot be supplied to the purge valve 131. The solenoid valve 16 is a directional valve, and when the governor downstream pipe 21 is closed, the purge valve 131 communicates with the atmosphere.

The indicated pressure detecting unit 31 is provided on the upstream side of the solenoid valve 16 in the governor downstream pipe 21. When the governor 15 starts supplying the instruction pressure to the solenoid valve 16, the instruction pressure detection unit 31 transmits a start detection signal S1 notifying that the supply of the instruction pressure has started to the control unit 60. Further, when the governor 15 stops the supply of the instruction pressure toward the solenoid valve 16, the instruction pressure detection unit 31 transmits a stop detection signal S2 notifying that the supply of the instruction pressure has been stopped to the control unit 60. Specifically, the indicated pressure detection unit 31 is a pressure switch, and when it detects that the pressure value in the governor downstream pipe 21 has reached the pressure value Pg3, it transmits an ON signal, the start detection signal S1, and the governor. When it is detected that the pressure value in the downstream pipe 21 is lower than the pressure value Pg3, the stop detection signal S2, which is an OFF signal, is transmitted to the control unit 60. The pressure value Pg3 is, for example, 500 kPa. The pressure value Pg3 may be above atmospheric pressure and below Pt2. Hereinafter, the pressure on the upstream side of the solenoid valve 16 in the governor downstream pipe 21 is referred to as the solenoid valve upstream pressure.

The flow rate sensor 41 is provided in a pipe connecting the compressor 11 and the air dryer 13. The flow rate sensor 41 measures the air flow rate in the pipe connecting the compressor 11 and the air dryer 13, that is, the flow rate of air from the compressor 11 to the air dryer 13, and transmits the measured value D1 to the control unit 60. The flow rate sensor 41 is, for example, an instantaneous flow rate sensor that measures the instantaneous flow rate in the pipe connecting the compressor 11 and the air dryer 13, or a cumulative flow rate sensor that measures the cumulative flow rate in the pipe.

The open / close detection unit 42 is a door switch. When the open / close detection unit 42 detects the operation of opening the door (not shown) of the vehicle 100, the open / close detection unit 42 transmits an open signal S3 notifying that the operation of opening the door is detected to the control unit 60, and detects the operation of closing the door. In this case, a closing signal S4 notifying that the operation of closing the door has been detected is transmitted to the control unit 60.

The operation detection unit 43 includes a purge stop button provided near the driver's seat of the vehicle 100. When the operation detection unit 43 detects the operation instructing the purge stop, the operation detection unit 43 transmits the operation detection signal S5 notifying that the operation instructing the purge stop is detected to the control unit 60. In the present embodiment, the operation of instructing the purge stop is to press the purge stop button. Once pressed, the purge stop button remains pressed (that is, in the ON state). Then, when the purge cancel described later is canceled, the state can be automatically pressed again (that is, the OFF state).

The output unit 50 is a speaker, a display unit, or a device in which a speaker and a display unit are combined. The output unit 50 is provided near the driver's seat of the vehicle 100, and under the control of the control unit 60, voice, screen display, and a voice, screen display, indicate that the purge process is being canceled and that the purge process is canceled. Alternatively, the occupant of the vehicle 100 is notified by a combination of voice and screen display.

Note that canceling the purge process corresponds to the solenoid valve 16 blocking the governor downstream pipe 21, and canceling the purge process cancels the cancellation of the purge process from the state in which the solenoid valve 16 blocks the governor downstream pipe 21. It corresponds to switching to the state where the downstream pipe 21 is opened.

The control unit 60 controls the entire purge system 1. More specifically, the control unit 60 controls the drive of the motor 12 (that is, the drive control of the compressor) and the solenoid valve based on various signals S1, S2, S3, S4, S5, the measured value D1, and the like. 16 open and closed are controlled.

The control unit 60 has, for example, a CPU (Central Processing Unit), a storage medium such as a ROM (Read Only Memory) in which a control program is stored, and a working memory such as a RAM (Random Access Memory). The operation of the purge system 1 is controlled by executing the control program.

<Compressor ON / OFF control>
The control unit 60 stops driving the compressor 11 when the start detection signal S1 is received from the instruction pressure detection unit 31, that is, when the governor 15 starts supplying the instruction pressure. Further, the control unit 60 starts driving the compressor 11 when the stop detection signal S2 is received from the instruction pressure detection unit 31, that is, when the governor 15 stops supplying the instruction pressure. In the present embodiment, when the compressor 11 is driven, the control unit 60 is driven so that the supply speed becomes a constant value.

When the control unit 60 receives the start detection signal S1 from the instruction pressure detection unit 31, the control unit 60 may rotate the motor 12 at a minute rotation speed instead of stopping the drive of the compressor 11. The minute rotation speed is the rotation speed of the motor 12 that can drive the compressor 11 toward the air dryer 13 to the extent that air is not supplied. That is, when the control unit 60 receives the start detection signal S1 from the instruction pressure detection unit 31, the control unit 60 stops the air supply from the compressor 11 to the air dryer 13, and receives the stop detection signal S2 from the instruction pressure detection unit 31. Occasionally, the compressor 11 may start supplying air to the air dryer 13. In the following description, the drive of the compressor 11 will be stopped when the start detection signal S1 is received from the instruction pressure detection unit 31.

Hereinafter, the drive control of the compressor 11 by the control unit 60 of the present embodiment will be described with reference to FIG.

FIG. 2 is a diagram illustrating drive start and drive stop of the compressor 11 executed by the purge system 1 according to the embodiment. It is assumed that the solenoid valve 16 always opens the governor downstream pipe 21 in the time range shown in FIG. The upper graph of FIG. 2 shows the time change of the tank pressure and the solenoid valve upstream pressure. Note that P0 in the upper graph of FIG. 2 indicates atmospheric pressure. The lower graph of FIG. 2 shows the timing at which the drive state (that is, ON state) and the drive stop state (that is, OFF state) of the compressor 11 are switched with time. At time T00, the compressor 11 is in the OFF state, and the governor 15 is in the state of supplying the indicated pressure.

Due to the use of air in the main tank 14 by each air device of the vehicle 100, the tank pressure drops, and when the tank pressure drops near Pt2, the governor 15 stops supplying the indicated pressure to the governor downstream pipe 21. As a result, at time T01, the solenoid valve upstream pressure drops to Pg3 or less, and the control unit 60 receives the stop detection signal S2 from the instruction pressure detection unit 31. Then, the control unit 60 starts driving the compressor 11 at time T01.

When the driving of the compressor 11 is started, air is supplied to the main tank 14, and the tank pressure rises.

Then, when the tank pressure reaches the vicinity of Pt1, the governor 15 starts supplying the indicated pressure to the governor downstream pipe 21. As a result, at time T02, the solenoid valve upstream pressure reaches Pg3, and the control unit 60 receives the start detection signal S1 from the instruction pressure detection unit 31. Then, the control unit 60 stops driving the compressor 11 at time T02.

When the drive of the compressor 11 is stopped, the tank pressure drops due to the use of air in the main tank 14 by each air device of the vehicle 100. Then, when the tank pressure drops in the vicinity of Pt2, the governor 15 stops supplying the indicated pressure to the governor downstream pipe 21. As a result, at time T03, the solenoid valve upstream pressure drops to Pg3, and the control unit 60 receives the stop detection signal S2 from the instruction pressure detection unit 31. Then, the control unit 60 starts driving the compressor 11 at time T03.

When the driving of the compressor 11 is started, air is supplied to the main tank 14, and the tank pressure rises.

When the tank pressure reaches the vicinity of Pt1, the governor 15 starts supplying the indicated pressure to the governor downstream pipe 21. As a result, at time T04, the solenoid valve upstream pressure reaches Pg3, and the control unit 60 receives the start detection signal S1 from the instruction pressure detection unit 31. Then, the control unit 60 stops driving the compressor 11 at time T04.

After the time T04, the same operation is repeated.

In this way, the governor 15 supplies the indicated pressure and stops the supply of the indicated pressure according to the change in the tank pressure. When paying attention to the operation of the governor 15, the time from the time when the governor 15 starts supplying the indicated pressure to the time when the governor 15 starts supplying the indicated pressure again, or the time when the governor 15 stops supplying the indicated pressure. One cycle is from the time when the governor 15 stops supplying the indicated pressure again. For example, in FIG. 2, the time from time T02 to time T04 corresponds to one cycle.

<Solenoid valve control>
FIG. 3 is a flowchart showing an example of control of the solenoid valve 16 executed by the purge system 1 according to the embodiment. Before the process shown in FIG. 3 is started, it is assumed that the governor downstream pipe 21 is opened by the solenoid valve 16.

The control unit 60 determines whether or not the purge stop button has been pressed (step S12). When the control unit 60 receives the operation detection signal S5 from the operation detection unit 43, the control unit 60 determines that the purge stop button has been pressed, and when the operation detection signal S5 has not been received from the operation detection unit 43, the purge stop button is pressed. Judge that it is not done. In the following description, pressing the purge stop button of the operation detection unit 43 may be referred to as an intention condition.

When it is determined that the purge stop button is pressed (YES in step S12), the control unit 60 is in the period from the start of the air supply by the compressor 11 to the stop of the air supply to the air dryer 13 by the compressor 11 (YES in step S12). Hereinafter, it is determined whether or not the air supply amount in the predetermined period) is smaller than the first flow rate threshold value (step S13).

In the present embodiment, the predetermined period corresponds to the driving time of the compressor 11. Further, the predetermined period corresponds to the time when the supply of the instruction pressure to the solenoid valve 16 by the governor 15 is stopped and the time when the supply of the instruction pressure to the solenoid valve 16 by the governor 15 is started, for example. , In FIG. 2, between time T01 and time T02, and between time T03 and time T04.

Actually, the control unit 60 acquires the measured value D1 by the flow rate sensor 41 in the predetermined period, and calculates the cumulative air flow rate of the pipe connecting the compressor 11 and the air dryer 13 in the predetermined period based on the acquired measured value D1. Then, the calculated cumulative air flow rate is compared with the first flow rate threshold. Here, the cumulative air volume in the predetermined period corresponds to the air supply amount in the predetermined period. Hereinafter, the cumulative air volume of the pipe connecting the compressor 11 and the air dryer 13 is simply referred to as the cumulative air volume.

The first flow rate threshold is determined based on the permissible amount of air passing through the desiccant D. For example, when the allowable amount of air in the desiccant D is 300 L, 180 L, which is 60% of 300 L, may be determined as the first flow rate threshold value. The allowable amount of air passing through the desiccant D is determined based on the amount of water and oil that the desiccant D can absorb.

When the amount of air supplied during the predetermined period is smaller than the first flow rate threshold value, it is assumed that the amount of air used in the main tank 14 by the various air devices of the vehicle 100 is relatively small. When the amount of air supplied during the predetermined period is equal to or greater than the first flow rate threshold value, it is assumed that the amount of air used in the main tank 14 by the various air devices of the vehicle 100 is relatively large. In the following description, the fact that the air supply amount for a predetermined period is smaller than the first flow rate threshold value is referred to as a supply amount stop condition (1).

When the amount of air supplied for a predetermined period is equal to or greater than the first flow rate threshold value (NO in step S13), the control unit 60 maintains the opening of the governor downstream pipe 21 by the solenoid valve 16 (step S14), and proceeds to step S12.

When the amount of air supplied during the predetermined period is less than the first flow rate threshold value (YES in step S13), the control unit 60 causes the solenoid valve 16 to close the governor downstream pipe 21 (step S15). As a result, even if the governor 15 supplies the indicated pressure to the governor downstream pipe 21, the indicated pressure is not supplied to the purge valve 131, and the purge process is not executed in the air dryer 13.

Next, the control unit 60 determines the amount of air supplied to the air dryer 13 by the compressor 11 from the time when the indicated pressure from the main tank 14 is no longer supplied to the purge valve 131 (hereinafter, referred to as the indicated pressure stop time). 2 It is determined whether or not the flow rate threshold has been reached (step S16).

First, the indicated pressure stop time will be described. The indicated pressure stop time is the time when the governor 15 stops supplying the indicated pressure when the electromagnetic valve 16 opens the governor downstream pipe 21, or when the governor 15 supplies the indicated pressure. It is the time when the valve 16 closes the governor downstream pipe 21.

For example, when the solenoid valve 16 closes the governor downstream pipe 21 after the time T02 in FIG. 2 and immediately before the time T03, the indicated pressure stop time is the time when the solenoid valve 16 closes the governor downstream pipe 21. Is. Further, when the solenoid valve 16 closes the governor downstream pipe 21 after the time T03 in FIG. 2 and before the time T04, the indicated pressure stop time is the time when the governor 15 stops supplying the indicated pressure. That is, it is time T03.

The control unit 60 acquires the measured value D1 by the flow rate sensor 41 from the indicated pressure stop time to the current time, and based on the acquired measured value D1, presses the compressor 11 and the air dryer 13 from the indicated pressure stop time to the current time. The cumulative air flow rate of the connecting pipes is calculated, and the calculated cumulative air flow rate is compared with the second flow rate threshold. In the following description, the fact that the amount of air supplied to the air dryer 13 by the compressor 11 from the indicated pressure stop time reaches the second flow rate threshold value may be referred to as the supply amount release condition (1).

The second flow rate threshold is determined based on the permissible amount of air passing through the desiccant D. For example, when the allowable amount of air in the desiccant D is 300 L, 390 L, which is 130% of 300 L, may be determined as the second flow rate threshold value. The second flow rate threshold value may be a value equal to or higher than the first flow rate threshold value.

When the amount of air supplied from the indicated pressure stop time to the current time reaches the second flow rate threshold value, it means that the amount of water or oil that can be additionally absorbed by the desiccant D is very small. On the other hand, when the air supply amount from the indicated pressure stop time to the current time does not reach the second flow rate threshold value, it means that the desiccant D has a relatively large amount of water and oil that can be additionally absorbed.

When the amount of air supplied to the air dryer 13 by the compressor 11 from the indicated pressure stop time has not reached the second flow rate threshold value (NO in step S16), the control unit 60 sets the air supply amount to the second flow rate threshold value. The process of step S16 is repeated until the value is reached.

When the amount of air supplied to the air dryer 13 by the compressor 11 from the indicated pressure stop time reaches the second flow rate threshold value (YES in step S16), the control unit 60 causes the solenoid valve 16 to open the governor downstream pipe 21 (YES in step S16). Step S17). As a result, when the governor 15 supplies the indicated pressure to the governor downstream pipe 21, the indicated pressure is supplied to the purge valve 131, so that the purge process is executed in the air dryer 13. After that, the control unit 60 executes the process of step S12.

When it is determined that the purge stop button is not pressed (NO in step S12), the control unit 60 determines whether or not the door of the vehicle 100 is open (step S18). When the control unit 60 receives the open signal S3 from the open / close detection unit 42 after the latest time when the close signal S4 is received, the control unit 60 determines that the door of the vehicle 100 has been opened and receives the close signal S4. If the open signal S3 has not been received after the latest time, it is determined that the door of the vehicle 100 remains closed. When the door of the vehicle 100 is open, it is assumed that the vehicle 100 is stopped. In the following description, the fact that the door of the vehicle 100 is open may be referred to as a stop condition. It can be said that the operation of pressing the purge stop button and the operation of opening the door are predetermined operations for stopping the purge process.

When it is determined that the door of the vehicle 100 is not opened (NO in step S18), the control unit 60 determines whether or not the latest purge time is equal to or longer than the reference time (step S19). The purge time is the time from the time when the solenoid valve upstream pressure reaches Pg3 to immediately before the time when the solenoid valve upstream pressure falls below Pg3. For example, the purge time is the time from time T02 to immediately before time T03 in FIG. The purge time is measured by the control unit 60. In the following description, the fact that the latest purge time is equal to or longer than the reference time may be referred to as a purge time condition.

The reference time is determined based on a guideline for the execution time of the purge process per cycle. For example, when the guideline of the execution time of the purge process is 60 seconds, the reference time may be determined to be 60 seconds or 90 seconds, which is a value of 150% of the guideline.

When the latest purge time is equal to or longer than the reference time, it is assumed that the water and oil in the desiccant D have been sufficiently removed. On the other hand, when the purging time is less than the reference time, it is assumed that the solenoid valve upstream pressure falls below Pg3 and the purging process is completed in a situation where the water and oil components of the desiccant D are not sufficiently removed.

When the purge time is less than the reference time (NO in step S19), the control unit 60 maintains the opening of the governor downstream pipe 21 by the solenoid valve 16 (step S14), and proceeds to step S12.

When the purge time is equal to or longer than the reference time (YES in step S19), the control unit 60 determines whether or not the air supply amount in the predetermined period described above is smaller than the third flow rate threshold value (step S20).

Here, the control unit 60 acquires the measured value D1 by the flow rate sensor 41 in the predetermined period, and calculates the cumulative air flow rate of the pipe connecting the compressor 11 and the air dryer 13 in the predetermined period based on the acquired measured value D1. , The calculated cumulative air flow rate is compared with the third flow rate threshold. In the following description, the fact that the air supply amount for a predetermined period is smaller than the third flow rate threshold value may be referred to as a supply amount stop condition (2).

The third flow rate threshold is determined based on the permissible amount of air passing through the desiccant D. For example, when the allowable amount of air in the desiccant D is 300 L, 90 L, which is 30% of 300 L, may be determined as the third flow rate threshold value. The third flow rate threshold value may be a value equal to or less than the first flow rate threshold value. The third flow rate threshold value may be the same value as the first flow rate threshold value, in which case the supply amount stop conditions (1) and (2) are the same as each other.

When the amount of air supplied for a predetermined period is equal to or greater than the third flow rate threshold value (NO in step S20), the control unit 60 maintains the opening of the governor downstream pipe 21 by the solenoid valve 16 (step S14), and proceeds to step S12.

When the amount of air supplied during the predetermined period is less than the third flow rate threshold value (YES in step S20), the control unit 60 causes the solenoid valve 16 to close the governor downstream pipe 21 (step S21). As a result, even if the governor 15 supplies the indicated pressure to the governor downstream pipe 21, the indicated pressure is not supplied to the purge valve 131, and the purge process is not executed in the air dryer 13.

Next, the control unit 60 determines whether or not the amount of air supplied to the air dryer 13 by the compressor 11 from the indicated pressure stop time has reached the fourth flow rate threshold value (step S22).

The control unit 60 acquires the measured value D1 by the flow rate sensor 41 from the indicated pressure stop time to the current time, and based on the acquired measured value D1, presses the compressor 11 and the air dryer 13 from the indicated pressure stop time to the current time. The cumulative air flow rate of the connecting pipes is calculated, and the calculated cumulative air flow rate is compared with the fourth flow rate threshold. In the following description, the fact that the amount of air supplied to the air dryer 13 by the compressor 11 from the indicated pressure stop time reaches the fourth flow rate threshold value may be referred to as the supply amount release condition (2).

The fourth flow rate threshold is determined based on the permissible amount of air passing through the desiccant D. The fourth flow rate threshold value may be a value equal to or higher than the third flow rate threshold value. In the present embodiment, it is assumed that the fourth flow rate threshold value is the same value as the third flow rate threshold value. Further, the fourth flow rate threshold value may be a value equal to or less than the second flow rate threshold value. The fourth flow rate threshold value may be the same value as the second flow rate threshold value, and in this case, the supply amount release conditions (1) and (2) are the same as each other.

When the amount of air supplied from the indicated pressure stop time to the current time reaches the fourth flow rate threshold value, it means that the amount of water or oil that can be additionally absorbed by the desiccant D is reduced. On the other hand, when the air supply amount from the indicated pressure stop time to the current time does not reach the fourth flow rate threshold value, it means that the desiccant D has a margin in the amount of water and oil that can be additionally absorbed.

When the amount of air supplied to the air dryer 13 by the compressor 11 from the indicated pressure stop time has not reached the fourth flow rate threshold value (NO in step S22), the control unit 60 sets the air supply amount to the fourth flow rate threshold value. The process of step S22 is repeated until the value is reached.

When the amount of air supplied to the air dryer 13 by the compressor 11 from the indicated pressure stop time reaches the fourth flow rate threshold value (YES in step S22), the control unit 60 causes the solenoid valve 16 to open the governor downstream pipe 21 (YES in step S22). Step S23). As a result, when the governor 15 supplies the indicated pressure to the governor downstream pipe 21, the indicated pressure is supplied to the purge valve 131, so that the purge process is executed in the air dryer 13. After that, the control unit 60 executes the process of step S12.

When it is determined that the door of the vehicle 100 is open (YES in step S18), the control unit 60 closes the governor downstream pipe 21 to the solenoid valve 16 (step S21). As a result, even if the governor 15 supplies the indicated pressure to the governor downstream pipe 21, the indicated pressure is not supplied to the purge valve 131, and the purge process is not executed in the air dryer 13. Subsequently, the control unit 60 moves to the process of step S21.

<Notification>
The control unit 60 closes the governor downstream pipe 21 to the solenoid valve 16 (steps S15 and S21), and notifies the occupant of the vehicle 100 that the purge process is being canceled through the output unit 50.

At this time, the control unit 60 may announce through the output unit 50 that the purge process is being canceled, or may display a screen displaying characters indicating that the purge process is being canceled, or announce. And screen display may be used together for notification.

Similarly, the control unit 60 causes the solenoid valve 16 to open the governor downstream pipe 21 (step S17), and notifies the occupant of the vehicle 100 that the purge cancellation has been canceled through the output unit 50. At this time, the control unit 60 may announce that the purge cancellation has been canceled through the output unit 50, or may display a screen for displaying characters indicating that the purge cancellation has been canceled, or the announcement and the screen. Notification may be performed in combination with the display.

Further, the control unit 60 may give a notification regarding purge cancellation through the output unit 50 as shown below.
(1) When the purge stop button is not pressed (OFF state), the information regarding the purge process is not shown through the output unit 50.
(2) First, when the purge stop button is pressed (ON state) and the solenoid valve 16 is in the state where the governor downstream pipe 21 is open, the purge process is stopped. (For example, orange) is displayed on the output unit 50.
(3) The first color indicates that the purge process cannot be stopped when the purge stop button is pressed (ON state) and the solenoid valve 16 is in the state where the governor downstream pipe 21 is open. A screen shown in a second color (for example, green) different from the above is displayed on the output unit 50. When the control unit 60 gives the notification shown in (3) through the output unit 50, the occupant of the vehicle 100 has not canceled the purge process even though the purge system 1 has pressed the purge stop button. You can know that you are in a situation.

<Other controls>
The control shown in the flowchart of FIG. 3 is a control in which the control unit 60 determines a stop condition when the intention condition is not satisfied. However, the control unit 60 determines the stop condition regardless of whether or not the intention condition is satisfied, and when the stop condition is satisfied, the solenoid valve 16 can close the governor downstream pipe 21.

Further, when it is determined that at least one of the intention condition, the supply amount stop condition (1), the supply amount stop condition (2), and the purge time condition is satisfied, the control unit 60 connects the solenoid valve 16 to the governor downstream pipe. 21 can be closed.

When the intention condition is satisfied, that is, when the purge stop button is pressed, when the control unit 60 closes the governor downstream pipe 21 to the solenoid valve 16, the intention of the occupant is prioritized. The purge stop button functions as an absolute purge stop button.

Further, the control unit 60 can determine whether or not the supply amount stop condition (1) is satisfied by a method other than calculating the air supply amount based on the measured value D1 by the flow rate sensor 41.

(Supply stop condition (1): time measurement)
When the time from the start of the air supply to the air dryer 13 by the compressor 11 to the stop of the air supply by the compressor 11 (that is, the driving time) is shorter than the first threshold time, the control unit 60 is the control unit 60. Can be determined to satisfy the supply amount stop condition (1).

The control unit 60 measures the time from the time when the stop detection signal S2 is received to the time when the start detection signal S1 is received, and compares the measured time with the first threshold time.

The first threshold time is determined based on the permissible amount of air passing through the desiccant D and the air supply rate of the compressor 11. For example, when the allowable amount of air in the desiccant D is 300 L and the air supply speed of the compressor 11 is 150 L / min, 1 minute and 12 seconds may be determined as the first threshold time. Note that 1 minute and 12 seconds is the time required for 180 L of air from the compressor 11 to be supplied to the air dryer 13.

When the driving time is shorter than the first threshold time, it is assumed that the amount of air used in the main tank 14 by the various air devices of the vehicle 100 is relatively small. When the amount of air supplied during the driving time is equal to or longer than the first threshold time, it is assumed that the amount of air used in the main tank 14 by the various air devices of the vehicle 100 is relatively large.

That is, by determining the first threshold time so that the air supply amount based on the first threshold time matches the first flow rate threshold value, the air supply amount from the compressor 11 to the air dryer 13 in a predetermined period becomes the first flow rate. It can be determined whether or not it is less than the threshold value, that is, whether or not the supply amount stop condition (1) is satisfied.

(Supply amount stop condition (1): time measurement and air supply speed)
The control unit 60 measures the drive time of the compressor 11, and based on the measured time and the air supply speed of the compressor 11 when the compressor 11 supplies air to the air dryer 13, the cumulative air flow during the drive time is based on the measured time. Calculate the amount (that is, the amount of air supplied). Then, when the calculated cumulative air flow rate is smaller than the first flow rate threshold value, the control unit 60 can determine that the supply amount stop condition (1) is satisfied. In this way, by calculating the air supply amount based on the drive time of the compressor 11 and the air supply speed of the compressor 11, the control unit 60 controls the compressor while the compressor 11 supplies air to the air dryer 13. Even when the air supply speed of No. 11 changes, it is possible to accurately determine whether or not the supply amount stop condition (1) is satisfied. For example, the drive start time of the compressor 11 is T11, the drive stop time T12 of the compressor 11 is 2 minutes after the time T11, and the air supply speed of the compressor 11 from the time T11 to the time T13 one minute later is 100 L / It is assumed that the air supply speed of the compressor 11 from the time T13 to the time T12 is 150 L / min. In this case, the control unit 60 can calculate the amount of air supplied during the driving time as 250L (100L + 150L). The air supply speed depends on the rotation speed of the motor 12 that drives the compressor 11.

Similarly, the control unit 60 can determine whether or not the supply amount stop condition (2) is satisfied by a method other than calculating the air supply amount based on the measured value D1 by the flow rate sensor 41. ..

(Supply stop condition (2): Time measurement)
When the drive time of the compressor 11 is shorter than the second threshold time, the control unit 60 can determine that the supply amount stop condition (2) is satisfied.

The control unit 60 measures the time from the time when the stop detection signal S2 is received to the time when the start detection signal S1 is received, and compares the measured time with the second threshold time.

The second threshold time is determined based on the permissible amount of air passing through the desiccant D and the air supply rate of the compressor 11. For example, when the allowable amount of air in the desiccant D is 300 L and the air supply speed of the compressor 11 is 150 L / min, 36 seconds may be determined as the second threshold time. 36 seconds is the time required for 90 L of air from the compressor 11 to be supplied to the air dryer 13.

That is, by determining the second threshold time so that the air supply amount based on the second threshold time matches the third flow rate threshold value, the air supply amount from the compressor 11 to the air dryer 13 in a predetermined period becomes the third flow rate. It can be determined whether or not it is less than the threshold value.

(Supply amount stop condition (2): Time measurement and air supply speed)
The control unit 60 measures the drive time of the compressor 11, and based on the measured time and the air supply speed of the compressor 11 when the compressor 11 supplies air to the air dryer 13, the cumulative air flow during the drive time is based on the measured time. Calculate the amount (that is, the amount of air supplied). Then, when the calculated cumulative air flow rate is smaller than the third flow rate threshold value, the control unit 60 can determine that the supply amount stop condition (2) is satisfied.

Further, in the control shown in the flowchart of FIG. 3, when the control unit 60 satisfies the supply amount release condition (1) or the supply amount release condition (2), the control unit 60 attaches the governor downstream pipe 21 to the solenoid valve 16. It is open. However, the control unit 60 can open the governor downstream pipe 21 to the solenoid valve 16 when any of the number of times condition and the traveling condition shown below is satisfied.

The number of times condition is that from the instruction pressure stop time, the number of times of repeating the start of the instruction pressure supply to the solenoid valve 16 by the governor 15 and the stop of the instruction pressure supply is repeated more than the threshold number of times.

When the number of repetitions of the start of supply of the instruction pressure to the solenoid valve 16 by the governor 15 and the stop of the supply of the instruction pressure by the governor 15 between the instruction pressure stop time and the current time is equal to or greater than the threshold number, the control unit 60 may perform the operation. The governor downstream pipe 21 can be opened by the solenoid valve 16. When the number of repetitions of starting the supply of the instruction pressure by the governor 15 and stopping the supply of the instruction pressure by the governor 15 is less than the threshold number, the control unit 60 does not open the governor downstream pipe 21 to the solenoid valve 16 and keeps it closed. do.

The number of repetitions is counted by the control unit 60, and the control unit 60 counts once when the start detection signal S1 is received at a time after the indicated pressure stop time. That is, the control unit 60 counts once each time the governor 15 starts supplying the indicated pressure toward the solenoid valve 16. The control unit 60 may count once each time the governor 15 stops supplying the instruction pressure toward the solenoid valve 16.

The control unit 60 counts once when the start detection signal S1 is received after the indicated pressure stop time. That is, the control unit 60 counts once each time the governor 15 starts supplying the indicated pressure toward the solenoid valve 16. Then, the control unit 60 determines whether or not the number of repetitions has reached the threshold number at the current time. The threshold number is, for example, two times.

When the number of repetitions reaches the threshold number, it means that the period during which the instruction pressure is not supplied to the purge valve 131 by the governor 15 is prolonged. That is, it can be considered that the desiccant D absorbs a considerable amount of water and oil. On the other hand, when the number of repetitions has not reached the threshold number, the period during which the instruction pressure is not supplied to the purge valve 131 by the governor 15 is not so long, and the desiccant D contains additional absorbable water and oil. It can be considered that the amount is relatively large.

The threshold number is determined by the case where the solenoid valve 16 closes the governor downstream pipe 21 because the intention condition is satisfied, and the case where the intention condition is not satisfied but other conditions are satisfied and the solenoid valve 16 is governor. The values may be different from each other depending on whether the downstream pipe 21 is closed.

The driving condition is that the door of the vehicle 100 is closed. When the control unit 60 receives the close signal S4 from the open / close detection unit 42 after the latest time when the open signal S3 is received, the control unit 60 determines that the door of the vehicle 100 has been closed, and after the latest time when the open signal S3 is received. If the closing signal S4 is not received, it is determined that the door of the vehicle 100 remains open. When the control unit 60 determines that the door of the vehicle 100 is closed, the control unit 60 maintains the blockage of the governor downstream pipe 21 by the solenoid valve 16 for a certain period of time (for example, several seconds) from the time when the closing signal S4 is received, and is constant. After the lapse of time, when the solenoid valve 16 opens the governor downstream pipe 21 and determines that the door of the vehicle 100 remains open, the control unit 60 does not open the governor downstream pipe 21 to the solenoid valve 16. Can continue to be blocked.

After a certain period of time has elapsed from the time when the control unit 60 receives the closing signal S4, the solenoid valve 16 opens the governor downstream pipe 21, waits for the vehicle 100 to travel, and then releases the stop of the purge process. can do. Therefore, it is possible to prevent pollution of the stop position of the vehicle 100 and the air around it due to the purging process being executed while the vehicle 100 is stopped.

Further, the control unit 60 determines whether or not the supply amount release condition (1) is satisfied by a method other than calculating the air supply amount from the indicated pressure stop time based on the measured value D1 by the flow rate sensor 41. can do.

(Supply amount release condition (1): time measurement)
When the first predetermined time elapses from the indicated pressure stop time, the control unit 60 can determine that the supply amount release condition (1) is satisfied.

The control unit 60 starts measuring the time from the indicated pressure stop time, and determines whether or not the current time has elapsed the first predetermined time from the indicated pressure stop time.

The first predetermined time is determined based on the allowable amount of air passing through the desiccant D and the air supply speed of the compressor 11. For example, when the allowable amount of air in the desiccant D is 300 L and the air supply speed of the compressor 11 is 150 L / min, 2 minutes and 36 seconds may be determined as the first predetermined time. Note that 2 minutes and 36 seconds is the time required for the air of 390 L from the compressor 11 to be supplied to the air dryer 13.

That is, by determining the first predetermined time so that the air supply amount in the first predetermined time matches the second flow rate threshold value, the air supply amount from the compressor 11 to the air dryer 13 in the predetermined period becomes the second flow rate threshold value. It can be determined whether or not it is less than.

(Supply amount release condition (1): time measurement and air supply speed)
The control unit 60 determines the amount of air supplied from the indicated pressure stop time based on the time elapsed from the indicated pressure stop time and the air supply speed of the compressor 11 when the compressor 11 is supplying air to the air dryer 13. calculate. For example, the indicated pressure stop time is T21, the time T22 2 minutes after the time T21 is the current time, the air supply speed from the time T21 to the time T23 1 minute after the time T21 is 100 L / min, and the time T23. It is assumed that the air supply speed of the compressor 11 for 1 minute from to time T22 is 150 L / min. In this case, the control unit 60 can calculate the air supply amount from the indicated pressure stop time to the current time as 250L (100L + 150L). Then, when the calculated air supply amount reaches the second flow rate threshold value, the control unit 60 can determine that the supply amount release condition is satisfied.

Further, the control unit 60 determines whether or not the supply amount release condition (2) is satisfied by a method other than calculating the air supply amount from the indicated pressure stop time based on the measured value D1 by the flow rate sensor 41. can do.

(Supply amount release condition (2): time measurement)
When the second predetermined time elapses from the indicated pressure stop time, the control unit 60 can determine that the supply amount release condition is satisfied.

The control unit 60 starts measuring the time from the indicated pressure stop time, and determines whether or not the current time has elapsed a second predetermined time from the indicated pressure stop time.

The second predetermined time is determined based on the allowable amount of air passing through the desiccant D and the air supply speed of the compressor 11. For example, when the allowable amount of air in the desiccant D is 300 L and the air supply speed of the compressor 11 is 150 L / min, 2 minutes and 36 seconds may be determined as the second predetermined time. Note that 2 minutes and 36 seconds is the time required for the air of 390 L from the compressor 11 to be supplied to the air dryer 13.

That is, by determining the second predetermined time so that the air supply amount in the second predetermined time matches the fourth flow rate threshold value, the air supply amount from the compressor 11 to the air dryer 13 in the second predetermined time becomes the fourth. It can be determined whether or not it is less than the flow rate threshold.

(Supply amount release condition (2): time measurement and air supply speed)
The control unit 60 determines the amount of air supplied from the indicated pressure stop time based on the time elapsed from the indicated pressure stop time and the air supply speed of the compressor 11 when the compressor 11 is supplying air to the air dryer 13. calculate. When the calculated air supply amount reaches the fourth flow rate threshold value, the control unit 60 can determine that the supply amount release condition is satisfied.

As described above, according to the present embodiment, the control unit 60 satisfies at least one of the intention condition, the supply amount stop condition (1) and (2), the stop condition, and the purge time condition. The governor downstream pipe 21 can be blocked by the solenoid valve 16 so that the indicated pressure is not supplied to the purge valve 131. Therefore, the purge process can be stopped independently of the operation of the governor 15. Therefore, the frequency of the purging process (that is, the regeneration operation of the desiccant D) in the air dryer 13 can be reduced.

When the intention condition is satisfied, the control unit 60 can close the governor downstream pipe 21 to the solenoid valve 16, so that the occupant of the vehicle 100 can execute the purge process at an arbitrary timing. Therefore, for example, when traveling in a residential area or alley in the early morning or late at night, or when it is not desired to generate a sound associated with the purging process such as when leaving or entering the garage, the occupant of the vehicle 100 may stop the purging process. can.

When the supply amount stop condition (1) or (2) is satisfied, the control unit 60 can block the governor downstream pipe 21 with the solenoid valve 16, so that the moisture and oil content of the desiccant D of the air dryer 13 can be absorbed. The purging process can be stopped in consideration of the possible amount. Therefore, the purge process can be stopped while reducing the load on each device of the vehicle 100. The load on each device of the vehicle 100 is that, for example, the piping connecting the air dryer 13 and the main tank 14 or the piping connecting the main tank 14 and each air device freezes, and the piping is blocked. Since the desiccant D cannot absorb the moisture any more, air containing a large amount of moisture is supplied to the main tank 14 and causes the main tank 14 to freeze. In addition, the load on each device of the vehicle 100 includes that the piping, the main tank 14, and the like are rusted, and that the solenoid valve 16 and the like do not operate normally.

When the vehicle stop condition is satisfied, the control unit 60 closes the governor downstream pipe 21 to the solenoid valve 16, so that the purge process can be stopped when the vehicle 100 is stopped. Therefore, the ground and its surroundings at a specific position such as a parking lot, a garage, a factory, and an entrance where the vehicle 100 is stopped due to the discharge of water and oil and air containing them due to the purging process. It is possible to prevent the air from being polluted.

When the purge time condition is satisfied, the control unit 60 closes the governor downstream pipe 21 to the solenoid valve 16, so that the purge process is performed based on whether or not the desiccant D is sufficiently regenerated. Can be stopped. Therefore, the purge process can be stopped while reducing the load on each device of the vehicle 100.

The control unit 60 can close the governor downstream pipe 21 to the solenoid valve 16 on condition that both the intention condition and the supply amount stop condition (1) are satisfied. As a result, even if the occupant of the vehicle 100 desires to stop the purging process, the supply of the indicated pressure is not stopped unless the supply amount stop condition (1) is satisfied. Therefore, not only the intention of the occupant of the vehicle 100 but also The purge process can be stopped in consideration of the load on each device of the vehicle 100.

Further, according to the present embodiment, when any of the supply amount release condition (1), the supply amount release condition (2), and the number of times condition is satisfied, the control unit 60 connects the solenoid valve 16 to the governor downstream pipe 21. Can be opened. If the period during which the purging process is not performed is prolonged, the desiccant D cannot absorb water and oil, and a load is applied to each device of the vehicle 100 such as the main tank 14. According to the present embodiment, it is possible to prevent the period during which the purging process is not performed from being prolonged, and to reduce the load on each device of the vehicle 100 due to the suspension of the purging process.

<Modification example of solenoid valve>
The solenoid valve 16 may be composed of a plurality of on-off valves as shown in FIGS. 4A and 4B. FIG. 4A is a diagram showing a solenoid valve 16 included in the purge system 1 according to the modified example, showing the purge system 1 in a state where the governor downstream pipe 21 is closed. FIG. 4B is a diagram showing a solenoid valve 16 included in the purge system 1 according to the modified example, showing the purge system 1 in a state where the governor downstream pipe 21 is closed.

The solenoid valve 16 is composed of a first valve 161 provided in the governor downstream pipe 21 and a second valve 162 provided in a pipe 22 (hereinafter referred to as an air open pipe) that communicates the purge valve with the atmosphere. It may be configured. When the second valve 162 opens the open pipe to the atmosphere, the purge valve 131 communicates with the atmosphere. The first valve 161 and the second valve 162 are valves for switching between opening and closing of the pipe.

The control unit 60 opens the governor downstream pipe 21 by the first valve at the timing of opening the governor downstream pipe 21, and closes the atmosphere open pipe by the second valve (see FIG. 4A). Further, the control unit 60 closes the governor downstream pipe 21 by the first valve at the timing of closing the governor downstream pipe 21, and opens the atmosphere open pipe by the second valve (see FIG. 4B).

<Other modifications>

When the compressor 11 supplies air toward the air dryer 13, the control unit 60 may change the supply speed of the compressor 11. That is, the control unit 60 may change the rotation speed of the motor 12.
If the purging process is not performed for a long time, air will continue to be supplied from the compressor 11 to the main tank 14, and the tank pressure may reach the limit value. Therefore, the purge system 1 includes a pressure sensor for measuring the tank pressure, and when the control unit 60 reaches a predetermined pressure value in which the measured value of the tank pressure by the pressure sensor is smaller than the limit value, the compressor 11 is used. The air supply may be stopped.

Further, when the humidity inside the air dryer 13 is less than a predetermined humidity, the control unit 60 closes the governor downstream pipe 21 to the solenoid valve 16 and when the humidity inside the air dryer 13 reaches another predetermined humidity. , The governor downstream pipe 21 may be opened to the solenoid valve 16. Here, another predetermined humidity is larger than the predetermined humidity.

Further, a flow velocity sensor may be provided instead of the flow rate sensor 41. In this case, the flow velocity sensor measures the flow velocity of the air passing through the pipe of the flow velocity sensor and transmits the measured value to the control unit 60. The control unit 60 determines the measured value and the cross-sectional area of the pipe of the flow velocity sensor. Based on this, the cumulative air flow rate (that is, the air supply amount) can be calculated.

The purge system 1 of the present disclosure may have a load / unload type configuration in which air is sent not only to the solenoid valve 16 but also to the compressor 11 by the operation of the governor 15. Further, the compressor 11 does not necessarily have to be an electric compressor, and may be a compressor that operates in conjunction with the operation of a drive source such as an engine.

In the above-described embodiment, the vehicle 100 has been described as a large vehicle, but any vehicle may be used as long as it is equipped with a device that uses air. The vehicle 100 may be, for example, an electric vehicle or an engine vehicle. For example, a purge system having a load / unload type configuration in which the indicated pressure is supplied to the compressor side to be in an unload state can be mounted on an engine vehicle.

Further, the purge system 1 described above may be mounted not only on the vehicle 100 but also on any device that uses air.

The above-described embodiments are merely examples of the embodiment of the present disclosure, and the technical scope of the present disclosure should not be construed in a limited manner by these. That is, the present disclosure can be carried out in various forms without departing from its gist or its main features.

The present disclosure may be suitably applied to a purge system that regenerates a desiccant in an air dryer by a purge process.

1 Purge system 11 Compressor 12 Motor 13 Air dryer 131 Purge valve 14 Main tank 15 Governor 16 Solenoid valve 161 First valve 162 Second valve 21 Governor downstream piping 22 Piping 31 Indicator pressure detection unit 41 Flow sensor 42 Open / close detection unit 43 Operation detection Part 50 Output part 60 Control part 100 Vehicle S1 Start detection signal S2 Stop detection signal S3 Open signal S4 Close signal S5 Operation detection signal D1 Measured value

Claims (13)

With the main tank
A compressor that discharges air and
An air dryer that has a purge valve and supplies the air discharged from the compressor to the main tank, and
A governor that stops the supply of the indicated pressure from the main tank and the supply of the indicated pressure according to the tank pressure which is the pressure in the main tank.
A solenoid valve that switches between closing the pipe connecting the governor and the purge valve and opening the pipe.
From the time when a predetermined operation is detected, it is determined that the amount of air supplied to the air dryer by the compressor during a predetermined period is less than the first threshold value, and the governor starts supplying the indicated pressure, the above. When at least one of the time until the time when the governor stops supplying the indicated pressure is equal to or longer than the reference time is satisfied, the control unit that causes the solenoid valve to block the pipe.
Purge system with. A flow rate sensor that measures the flow rate of air from the compressor to the air dryer and transmits the measured value of the flow rate to the control unit is further provided.
Based on the measured value, the control unit calculates the amount of air supplied from the start of air supply to the air dryer by the compressor to the stop of the air supply by the compressor, and the calculation is performed. The purge system according to claim 1, wherein when the amount of air supplied is less than the first threshold value, the solenoid valve closes the pipe. When the time from the start of air supply to the air dryer by the compressor to the stop of the air supply by the compressor is shorter than the threshold time, the control unit claims that the solenoid valve closes the pipe. Item 1. The purge system according to item 1. The control unit starts the air supply based on the time from the start of the air supply to the air dryer by the compressor to the stop of the air supply by the compressor and the air supply speed of the compressor. The air supply amount in the time from when the air supply is stopped is calculated, and when the calculated air supply amount is smaller than the first threshold value, the control unit connects the solenoid valve to the pipe. The purge system according to claim 1, wherein the purge system is closed. When it is detected that the governor has started supplying the indicated pressure to the solenoid valve, a start detection signal notifying the start of supplying the indicated pressure is transmitted to the control unit, and the governor sends the governor to the solenoid valve. When it is detected that the supply of the directed pressure is stopped, the control unit is further provided with an instruction pressure detection unit that transmits a stop detection signal notifying the stop of the supply of the instruction pressure to the control unit.
Any of claims 2 to 4, wherein the control unit causes the compressor to stop the air supply when the start detection signal is received, and causes the compressor to start the air supply when the stop detection signal is received. The purge system described in one item. When the air supply amount from the time when the indicated pressure is no longer supplied to the purge valve reaches the second threshold value which is a value equal to or higher than the first threshold value, the control unit sends the piping to the solenoid valve. The purge system according to claim 5, wherein the purge system is opened. The purge system according to claim 5, wherein when a predetermined time elapses from the time when the indicated pressure is no longer supplied to the purge valve, the control unit causes the solenoid valve to open the pipe. The control unit has the air from the time when the indicated pressure is no longer supplied to the purge valve based on the time elapsed from the time when the indicated pressure is no longer supplied to the purge valve and the air supply speed of the compressor. A claim that calculates a supply amount, and when the calculated air supply amount reaches a second threshold value that is equal to or greater than the first threshold value, the control unit causes the solenoid valve to open the pipe. 5. The purge system according to 5. When the start of supply of the instruction pressure to the solenoid valve by the governor and the stop of the supply of the instruction pressure by the governor are repeated a threshold number of times from the time when the instruction pressure is no longer supplied to the purge valve, the control unit performs the control unit. The purge system according to claim 5, wherein the solenoid valve opens the pipe. The solenoid valve has a first valve provided in the pipe and a second valve that opens the purge valve to communicate with the atmosphere.
The time when a predetermined operation is detected, the amount of air supplied to the air dryer by the compressor during a predetermined period is determined to be less than the first threshold value, and the time when the governor starts supplying the indicated pressure. When at least one of the time from the governor to the time when the supply of the indicated pressure is stopped is satisfied by the reference time or more, the control unit closes the pipe to the first valve. The purge system according to any one of claims 1 to 9, wherein the second valve is opened. A vehicle comprising the purge system according to any one of claims 1 to 10. With the door
When the operation of opening the door is detected, an open / close detection unit for transmitting an open signal notifying that the door has been opened to the control unit is further provided.
When the control unit receives the open signal, the control unit closes the pipe to the solenoid valve.
The vehicle according to claim 11. When an operation instructing the purge stop is detected, an operation detection signal for notifying that the operation to be instructed has been detected and an operation detection unit to be transmitted to the control unit are further provided.
When the control unit receives the operation detection signal, the control unit closes the pipe to the solenoid valve.
The vehicle according to claim 11.

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