WO2021200659A1 - Système de purge et véhicule - Google Patents

Système de purge et véhicule Download PDF

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Publication number
WO2021200659A1
WO2021200659A1 PCT/JP2021/012871 JP2021012871W WO2021200659A1 WO 2021200659 A1 WO2021200659 A1 WO 2021200659A1 JP 2021012871 W JP2021012871 W JP 2021012871W WO 2021200659 A1 WO2021200659 A1 WO 2021200659A1
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WIPO (PCT)
Prior art keywords
air
flow path
pressure
purge
time
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Application number
PCT/JP2021/012871
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English (en)
Japanese (ja)
Inventor
徹 秋庭
哲也 熊田
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いすゞ自動車株式会社
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Publication of WO2021200659A1 publication Critical patent/WO2021200659A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/02—Arrangements of pumps or compressors, or control devices therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/16—Filtration; Moisture separation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B41/00—Pumping installations or systems specially adapted for elastic fluids
    • F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs

Definitions

  • This disclosure relates to purge systems and vehicles.
  • 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 is provided with a purge valve, and when air is supplied to the purge valve from the tank, 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.
  • a pressure governor is provided in the pipe connecting the tank and the purge valve, and the pressure governor is used as a purge valve when the pressure in the tank becomes relatively high. Supply air.
  • the amount of air used in the tank by the air equipment is large, the amount of air in the tank is unlikely to increase. Therefore, it takes a long time for the pressure in the tank to reach the pressure at which the pressure governor starts supplying air to the purge valve, so that the time when the desiccant is not regenerated in the air dryer is prolonged. Therefore, the desiccant tends to deteriorate, and as a result, the life of the desiccant in the air dryer may be shortened.
  • 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 equipped with a purge system capable of extending the life of the desiccant of the air dryer.
  • One aspect of the purge system of the present disclosure includes a main tank, a compressor for discharging air, and a purge valve, and the air discharged from the compressor and flowing in through the first flow path is taken into the main tank.
  • An electromagnetic valve that switches the flow path of the air dryer supplied to the compressor and the flow path of the discharged air between the first flow path and the second flow path for supplying the discharged air to the purge valve, and the above-mentioned
  • the switching operation by the solenoid valve is controlled, a predetermined operation is detected, it is determined that the amount of air supplied to the air dryer by the compressor in a predetermined period is equal to or higher than the first threshold value, and the solenoid.
  • the solenoid valve includes a control unit that switches the flow path of the air discharged from the first flow path to the second flow path.
  • One aspect of the vehicle of the present disclosure comprises the purge system described above.
  • FIG. 1 is a diagram showing a main configuration of a purge system included in a vehicle according to an embodiment.
  • FIG. 2 is a diagram showing the time change of the pressure in the main tank while the purge system according to the embodiment controls the solenoid valve in the normal mode.
  • FIG. 3 is a flowchart showing an example of a control mode switching operation of the solenoid valve executed by the purge system according to the embodiment.
  • FIG. 4 is a flowchart showing an example of a control mode switching operation of the solenoid valve executed by the purge system according to the first modification.
  • FIG. 5 is a diagram showing a main configuration of a purge system included in the vehicle according to the second modification.
  • 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.
  • 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 solenoid valve 16, a security valve 18, a pressure sensor 32, a flow rate sensor 41, a stop operation detection unit 42, an instruction operation detection unit 43, and a control unit. It has 60.
  • the compressor 11 discharges the sucked air at a desired flow rate, and supplies the discharged air toward the solenoid valve 16.
  • 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 discharged from the compressor 11 and flowing through the first flow path described later, and supplies the air from which the water and oil have been removed to the main tank 14.
  • the air dryer 13 is provided with an accommodating portion (not shown), and the accommodating portion stores the desiccant D.
  • the desiccant D absorbs water and oil in the air that has flowed into the accommodating portion of 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, a regeneration process of the desiccant D, a so-called purge process, is executed.
  • the indicated pressure is air that triggers the air dryer 13 to execute the purge process.
  • the indicated pressure is supplied from the compressor 11 via a second flow path described later.
  • the purge valve 131 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 first flow path is a flow path for supplying the air discharged from the compressor 11 to the accommodating portion of the air dryer 13, and is composed of the first pipe 21 and the second pipe 22.
  • the first pipe 21 is a pipe connecting the solenoid valve 16 and the compressor 11, and the second pipe 22 connects the solenoid valve 16 and the air dryer 13, and the air flowing into the second pipe is air-dried. It is a pipe leading to the accommodating portion of 13.
  • the second flow path is a flow path for supplying the air discharged from the compressor 11 to the purge valve 131 of the air dryer 13 as an instruction pressure, and is composed of the first pipe 21 and the third pipe 23.
  • the third pipe 23 is a pipe that connects the solenoid valve 16 and the purge valve 131.
  • supplying the discharge air to the purge valve 131 may be referred to as supplying the indicated pressure.
  • 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 solenoid valve 16 is arranged on the downstream side of the compressor 11 and on the upstream side of the air dryer 13 in the flow of air discharged from the compressor 11. Under the control of the control unit 60, the solenoid valve 16 moves the flow path of the air discharged from the compressor 11 (hereinafter, referred to as discharge air) between the first flow path and the second flow path. Switch.
  • Switching the discharge air flow path from the second flow path to the first flow path means that the connection between the first pipe 21 and the third pipe 23 is cut off, and the first pipe 21 and the second pipe are used. Corresponds to connecting with 22. As a result, the first flow path is opened, and the discharged air flows from the first pipe 21 into the second pipe 22 and flows into the accommodating portion of the air dryer 13. As a result, air is supplied to the main tank 14.
  • the solenoid valve 16 connects the first pipe 21 and the second pipe 22 and also connects the third pipe 23 to the atmospheric communication pipe 24.
  • the air communication pipe 24 is connected to the solenoid valve 16 and is a pipe that communicates the solenoid valve 16 with the atmosphere. By connecting the third pipe 23 to the atmospheric communication pipe 24, the purge valve 131 and the atmosphere communicate with each other.
  • Switching the discharge air flow path from the first flow path to the second flow path means that the connection between the first pipe 21 and the second pipe 22 is cut off, and the first pipe 21 and the third pipe are used. Corresponds to connecting with 23. As a result, the discharged air flows from the first pipe 21 to the third pipe 23, so that the indicated pressure is supplied to the purge valve 131.
  • the security valve 18 is a mechanical valve provided in the third pipe 23.
  • the valve upstream pressure When the pressure of the third pipe 23 (hereinafter referred to as the valve upstream pressure) reaches a certain pressure, the security valve 18 releases the air in the third pipe 23 to the outside, and the valve upstream pressure becomes high. It is designed to stop the release of air in the third pipe 23 when the pressure drops below a certain level.
  • the constant pressure is an acceptable value in the third pipe 23, and is, for example, 1000 kPa.
  • the pressure sensor 32 is attached to the main tank 14.
  • the pressure sensor 32 measures the pressure inside the main tank 14 (hereinafter, referred to as tank pressure), and transmits the measured value D0 to the control unit 60.
  • the pressure sensor 32 may be provided in a pipe that guides the air in the main tank 14 from the main tank 14 to each air device of the vehicle 100. Further, the pressure sensor 32 may be provided in a pipe connecting the air dryer 13 and the main tank 14, that is, a pipe for guiding the air from which the water and oil flowing out from the air dryer 13 have been removed to the main tank 14.
  • the flow rate sensor 41 is provided in the second pipe 22.
  • the flow rate sensor 41 measures the air flow rate in the second pipe 22, 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 stop operation detection unit 42 is a switch, and when it detects an operation to stop the operation of the vehicle 100, it transmits a stop operation detection signal S3 notifying that the operation to stop the operation has been detected to the control unit 60.
  • the operation of stopping the operation of the vehicle 100 is, for example, an operation of turning off the ignition key and the engine key.
  • the instruction operation detection unit 43 includes a purge button provided near the driver's seat of the vehicle 100.
  • the instruction operation detection unit 43 transmits the instruction operation detection signal S5 notifying that the operation instructing the purge has been detected to the control unit 60.
  • the operation of instructing the purge is to press the purge button.
  • the operation of pressing the purge instruction button and the operation of stopping the operation of the vehicle 100 are both predetermined operations for forcibly executing the purge process.
  • the control unit 60 controls the entire purge system 1. More specifically, the control unit 60 controls the flow path switching operation by the solenoid valve 16 based on various signals S3 and S5, measured values D0 and D1, and the like.
  • the control unit 60 has, for example, a storage medium such as a CPU (Central Processing Unit), a ROM (Read Only Memory) in which a control program is stored, and a working memory such as a RAM (Random Access Memory).
  • a storage medium such as a CPU (Central Processing Unit), 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.
  • control unit 60 always rotates the motor 12 at a predetermined rotation speed. That is, the control unit 60 always discharges air to the compressor 11 toward the first pipe 21 at a constant supply speed.
  • the control unit 60 controls the solenoid valve 16 in either a normal mode or a purge mode.
  • the pressure value Pt1 is larger than the pressure value Pt2.
  • 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 purge mode is a control mode in which the flow path of the discharged air is maintained in the second flow path regardless of the magnitude of the tank pressure.
  • the control mode is the purge mode, the control unit 60 continues to supply the indicated pressure from the compressor 11 to the purge valve 131 regardless of the tank pressure.
  • FIG. 2 is a diagram showing a pressure change of the tank pressure while the purge system 1 according to the embodiment controls the solenoid valve 16 in the normal mode.
  • the vertical axis of the graph of FIG. 2 is the tank pressure, and the horizontal axis is the time. Note that P0 in the graph of FIG. 2 indicates atmospheric pressure.
  • the solenoid valve 16 uses the discharge air flow path as the second flow path and closes the first flow path. Therefore, at time T00, air is not supplied to the main tank 14, and the indicated pressure is supplied to the purge valve 131.
  • the tank pressure drops due to the use of air in the main tank 14 by each air device of the vehicle 100, and when the tank pressure drops to Pt2 at time T01, the control unit 60 sets the measured value D0 of the pressure sensor 32. It is determined that the pressure has decreased to Pt2. Then, at time T01, the control unit 60 causes the solenoid valve 16 to switch the flow path of the discharged air from the second flow path to the first flow path.
  • the first pipe 21 and the second pipe 23 are connected from the state where the first pipe 21 and the third pipe 23 are connected and the connection between the first pipe 21 and the second pipe 22 is cut off.
  • the pipe 22 is connected, and the connection between the first pipe 21 and the third pipe 23 is cut off. Further, the third pipe 23 is connected to the atmospheric communication pipe 24.
  • the discharge air is supplied to the main tank 14 via the air dryer 13, and the supply of the indicated pressure is stopped. do.
  • the purge valve 131 When the indicated pressure is no longer supplied to the purge valve 131, the purge process in the air dryer 13 is stopped.
  • the control unit 60 determines that the measured value D0 of the pressure sensor 32 has reached Pt1. Then, at time T02, the control unit 60 causes the solenoid valve 16 to switch the flow path of the discharged air from the first flow path to the second flow path. As a result, the first pipe 21 and the second pipe 22 are connected, the connection between the first pipe 21 and the third pipe 23 is cut off, and the third pipe 23 and the atmospheric communication pipe are connected. From the state in which the 24 is connected, the first pipe 21 and the third pipe 23 are connected, and the connection between the first pipe 21 and the second pipe 22 is cut off.
  • the discharge air is supplied to the purge valve 131 as the indicated pressure, and the air is supplied to the main tank 14. Stops.
  • the air dryer 13 executes the purge process. During that time, the discharged air is not supplied toward the main tank 14, so that the amount of air in the main tank 14 decreases and the tank pressure drops due to the use of the air in the main tank 14 by each air device of the vehicle 100. go.
  • the control unit 60 determines that the measured value D0 of the pressure sensor 32 has dropped to Pt2. Then, at time T03, the control unit 60 causes the solenoid valve 16 to switch the flow path of the discharged air from the second flow path to the first flow path.
  • the first pipe 21 and the second pipe 23 are connected from the state where the first pipe 21 and the third pipe 23 are connected and the connection between the first pipe 21 and the second pipe 22 is cut off.
  • the pipe 22 is connected, and the connection between the first pipe 21 and the third pipe 23 is cut off. Further, the third pipe 23 is connected to the atmospheric communication pipe 24.
  • the discharge air is supplied to the main tank 14 via the air dryer 13, and the supply of the indicated pressure is stopped. do.
  • the purge valve 131 When the indicated pressure is no longer supplied to the purge valve 131, the purge process in the air dryer 13 is stopped.
  • the control unit 60 determines that the measured value D0 of the pressure sensor 32 has reached Pt1. Then, at time T04, the control unit 60 causes the solenoid valve 16 to switch the flow path of the discharged air from the first flow path to the second flow path. As a result, the first pipe 21 and the second pipe 22 are connected, the connection between the first pipe 21 and the third pipe 23 is cut off, and the third pipe 23 and the atmospheric communication pipe are connected. From the state in which the 24 is connected, the first pipe 21 and the third pipe 23 are connected, and the connection between the first pipe 21 and the second pipe 22 is cut off.
  • the discharge air is supplied to the purge valve 131 as the indicated pressure, and the air is supplied to the main tank 14. Stops.
  • the air dryer 13 executes the purge process. During that time, the discharged air is not supplied toward the main tank 14, so that the amount of air in the main tank 14 decreases and the tank pressure drops due to the use of the air in the main tank 14 by each air device of the vehicle 100. go.
  • the solenoid valve 16 switches the flow path of the discharged air between the first flow path and the second flow path according to the change in the tank pressure.
  • the solenoid valve 16 switches the flow path of the discharged air between the first flow path and the second flow path according to the change in the tank pressure.
  • one cycle is from the time when the solenoid valve 16 stops supplying the indicated pressure to the purge valve 131 to the time when the solenoid valve 16 stops supplying the indicated pressure to the purge valve 131 again.
  • the time from time T02 to time T04 corresponds to one cycle.
  • FIG. 3 is a flowchart showing an example of a control mode switching operation of the solenoid valve 16 executed by the purge system 1 according to the embodiment. Before the process shown in FIG. 3 is started, the control unit 60 controls the solenoid valve 16 in the normal mode.
  • the control unit 60 determines whether or not the tank pressure is equal to or higher than the first pressure threshold value (step S11).
  • the control unit 60 compares the measured value D0 of the pressure sensor 32 with the first pressure threshold value.
  • the first pressure threshold value may be set in a range of Pt2 or less and larger than the atmospheric pressure.
  • the first pressure threshold value may be 760 kPa, 780 kPa, or 800 kPa.
  • the first pressure threshold will be described as being less than Pt2.
  • the fact that the tank pressure is equal to or higher than the first pressure threshold value may be referred to as the minimum pressure auxiliary condition.
  • the tank pressure When the tank pressure is smaller than the first pressure threshold value, it can be considered that the amount of air inside the main tank 14 is considerably small. On the other hand, when the tank pressure is equal to or higher than the first pressure threshold value, it can be considered that the amount of air inside the main tank 14 has a relatively large margin even if the supply of the indicated pressure is continued.
  • step S11 When the tank pressure is smaller than the first pressure threshold value (NO in step S11), the control unit 60 maintains the control mode of the solenoid valve 16 in the normal mode (step S14), and returns to the process of step S11.
  • the control unit 60 determines whether or not the purge instruction button has been pressed (step S12).
  • the control unit 60 determines that the purge instruction button has been pressed when the instruction operation detection signal S5 is received from the instruction operation detection unit 43, and purges when the instruction operation detection signal S5 is not received from the instruction operation detection unit 43. It is determined that the instruction button is not pressed.
  • pressing the purge instruction button of the instruction operation detection unit 43 may be referred to as an intention condition.
  • step S12 When it is determined that the purge instruction button has been pressed (YES in step S12), the control unit 60 starts from the time when the air supply to the air dryer 13 by the compressor 11 is started (hereinafter, referred to as the air supply start time). It is determined whether or not the air supply amount has reached the first flow rate threshold value (step S13).
  • the air supply start time is the latest time when the control unit 60 receives the measured value D1 whose pressure value is Pt2 or less while the control unit 60 is controlled in the normal mode, and the flow path of the discharged air is , The latest time when the second flow path is switched to the first flow path. Further, the air supply start time corresponds to the latest time when the supply of the indicated pressure to the purge valve 131 is stopped.
  • the control unit 60 acquires the measured value D1 by the flow sensor 41 from the air supply start time to the current time, and based on the acquired measured value D1, the period from the air supply start time to the current time (hereinafter, a predetermined period).
  • the cumulative air flow rate of the air in the second pipe 22 is calculated.
  • the control unit 60 compares the calculated cumulative air flow rate with the first flow rate threshold value.
  • the cumulative air volume in the predetermined period corresponds to the air supply amount in the predetermined period.
  • 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, 330 L, which is 110% of 300 L, may be determined as the first flow rate threshold value, or 240 L, which is 80% of 300 L, may be set as the first flow rate threshold value. It may be decided.
  • 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.
  • the air supply amount in the predetermined period reaches the first flow rate threshold value, it means that the amount of water and oil that can be additionally absorbed by the desiccant D is relatively small.
  • the fact that the air supply amount for a predetermined period is equal to or greater than the first flow rate threshold value is referred to as a supply amount condition (1).
  • control unit 60 When the air supply amount in the predetermined period has not reached the first flow rate threshold value (NO in step S13), the control unit 60 maintains the control mode of the solenoid valve 16 in the normal mode (step S14), and performs the process in step S11. return.
  • the control unit 60 determines whether or not the time when the tank pressure does not reach Pt1 is less than the reference pressure time TS1 (YES in step S13). Step S15).
  • the control unit 60 measures the time from the time when the tank pressure reaches Pt1 most recently, and compares the measured time with the reference pressure time TS1.
  • the reference pressure time TS1 is a value set to prevent the period in which the filling rate of the main tank 14 does not reach close to 100% from being prolonged, and is, for example, 10 minutes.
  • step S15 When the measurement time in step S15 is equal to or longer than the reference pressure time TS1, for example, although the tank pressure exceeds Pt2, the tank pressure remains flat due to a large amount of air used by the air equipment. Therefore, it is assumed that it takes time for the tank pressure to reach Pt1.
  • the time when the tank pressure does not reach Pt1 that is, the time when the tank pressure is less than Pt1 is less than the reference pressure time TS1
  • the air amount auxiliary condition (1) the time when the tank pressure does not reach Pt1
  • step S15 When the time when the tank pressure does not reach Pt1 is equal to or longer than the reference pressure time TS1 (NO in step S15), the control unit 60 maintains the control mode of the solenoid valve 16 in the normal mode (step S14), and processes in step S11. Return to.
  • control unit 60 switches the control mode of the solenoid valve 16 from the normal mode to the purge mode (step S16).
  • the flow path of the discharge air is switched from the first flow path to the second flow path, so that the discharge air is supplied to the purge valve 131 as the indicated pressure. Therefore, the air dryer 13 receives the indicated pressure supplied from the compressor 11 and performs the purge process.
  • the discharge air can flow into the second pipe 22, so that the air is not supplied from the compressor 11 to the main tank 14. Therefore, the tank pressure gradually decreases as the air equipment uses the air in the main tank 14.
  • the control unit 60 determines whether or not the tank pressure is smaller than the second pressure threshold value (step S17).
  • the control unit 60 compares the measured value D0 of the pressure sensor 32 with the second pressure threshold value.
  • the second pressure threshold value may be set in a range of Pt2 or less and larger than the atmospheric pressure.
  • the second pressure threshold is, for example, 750 kPa.
  • the second pressure threshold value may be a value equal to or less than the first pressure threshold value.
  • the fact that the tank pressure is smaller than the second pressure threshold value may be referred to as the pressure release condition (1).
  • the control unit 60 switches the control mode of the solenoid valve 16 from the purge mode to the normal mode (step S18). That is, the control unit 60 controls the solenoid valve 16 in a control mode for switching the flow path of the discharged air according to the tank pressure.
  • the tank pressure is Pt2 or less at the timing when the control mode of the solenoid valve 16 is switched from the purge mode to the normal mode. Therefore, when the control unit 60 switches the control mode of the solenoid valve 16 from the purge mode to the normal mode, the solenoid valve 16 blocks the second flow path. Therefore, by switching from the purge mode to the normal mode, the supply of the indicated pressure from the compressor 11 to the purge valve 131 is stopped. Therefore, the purge process in the air dryer 13 is stopped.
  • the control unit 60 measures the time from the time when the tank pressure reaches Pt1 most recently, and compares the measured time with the reference pressure time TS3.
  • the reference pressure time TS3 is a value set to prevent the period in which the filling rate of the main tank 14 does not reach close to 100% from being prolonged, and is, for example, 15 minutes.
  • the reference pressure time TS3 may be at least the reference pressure time TS1 or more. In the following description, the time from the time when the tank pressure reaches Pt1 most recently is the reference pressure time TS3 or more, which is referred to as the air amount release condition (1).
  • step S19 When the time when the tank pressure does not reach Pt1 is less than the reference pressure time TS3 (NO in step S19), the control unit 60 executes the process of step S17. When the time when the tank pressure does not reach Pt1 is equal to or longer than the reference pressure time TS3 (YES in step S19), the control unit 60 executes the process of step S18.
  • the control unit 60 determines whether or not the latest purge time is less than the reference time (step S20).
  • the purge time is the time from the time when the tank pressure reaches Pt1 to immediately before the time when the tank pressure drops to Pt2 while the solenoid valve 16 is controlled in the normal mode. In other words, it is the time from the time when the control unit 60 receives the measured value D0 whose tank pressure is Pt1 or more to immediately before the time when the measured value D0 whose tank pressure is Pt2 or less is received.
  • 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 less than the reference time is referred to as a purge time condition.
  • the reference time is determined based on the guideline of 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 30 seconds, which is a value of 50% of the guideline.
  • the latest purge time is longer than the reference time, it is assumed that the water and oil in the desiccant D have been sufficiently removed.
  • the purging time is less than the reference time, it is assumed that the second flow path is blocked by the solenoid valve 16 and the purging process is completed in a situation where the water and oil content of the desiccant D is not sufficiently removed. Will be done.
  • step S20 When the purge time is equal to or longer than the reference time (NO in step S20), the control unit 60 executes the process of step S14.
  • the control unit 60 determines whether or not the air supply amount in the predetermined period described above has reached the second flow rate threshold value (step S21).
  • 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 air in the pipe connecting the compressor 11 and the air dryer 13 in the predetermined period based on the acquired measured value D1. Then, the control unit 60 compares the calculated cumulative air flow rate with the second flow rate threshold value.
  • 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, 450 L, which is 150% of 300 L, may be determined as the second flow rate threshold value, or 300 L may be determined as the second flow rate threshold value.
  • the air supply amount in the predetermined period reaches the second flow rate threshold value, it means that the amount of water and oil that can be additionally absorbed by the desiccant D is very small.
  • the fact that the air supply amount for a predetermined period is equal to or greater than the second flow rate threshold value is referred to as a supply amount condition (2).
  • the second flow rate threshold value may be the same value as the first flow rate threshold value. In this case, the supply amount conditions (1) and (2) are the same as each other.
  • step S21 When the air supply amount for a predetermined period has not reached the second flow rate threshold value (NO in step S21), the control unit 60 executes the process of step S14.
  • the control unit 60 determines whether or not the time when the tank pressure does not reach Pt1 is less than the reference pressure time TS2 (YES in step S21). Step S22).
  • the reference pressure time TS2 is a value set to prevent the period in which the filling rate of the main tank 14 does not reach close to 100% from being prolonged, and is, for example, 5 minutes.
  • the reference pressure time TS2 is shorter than the reference pressure time TS1. Therefore, when the purge instruction button is pressed, the control mode of the solenoid valve 16 is more likely to be switched to the purge mode than when the purge instruction button is not pressed.
  • the reference pressure time TS2 may be the same as the reference pressure time TS1.
  • the time when the tank pressure does not reach Pt1 that is, the time when the tank pressure is less than Pt1 is less than the reference pressure time TS2 is referred to as the air amount auxiliary condition (2).
  • the air amount auxiliary condition (2) is the same as the air amount auxiliary condition (1).
  • step S22 When the time when the tank pressure does not reach Pt1 is equal to or longer than the reference pressure time TS2 (NO in step S22), the control unit 60 executes the process of step S14. When the time when the tank pressure does not reach Pt1 is less than the reference pressure time TS2 (YES in step S22), the control unit 60 switches the control mode of the solenoid valve 16 from the normal mode to the purge mode (step S23).
  • the flow path of the discharge air is switched from the first flow path to the second flow path, so that the discharge air is supplied to the purge valve 131 as the indicated pressure. Therefore, the air dryer 13 receives the indicated pressure supplied from the compressor 11 and performs the purge process.
  • the discharge air can flow into the second pipe 22, so that the air is not supplied from the compressor 11 to the main tank 14. Therefore, the tank pressure gradually decreases as the air equipment uses the air in the main tank 14.
  • the control unit 60 determines whether or not the tank pressure is smaller than the third pressure threshold value (step S24).
  • the control unit 60 compares the measured value D0 of the pressure sensor 32 with the third pressure threshold value.
  • the third pressure threshold value may be set in a range of Pt2 or less and larger than the atmospheric pressure.
  • the third pressure threshold value is larger than the second pressure threshold value and is the same value as the first pressure threshold value.
  • the fact that the tank pressure is smaller than the second pressure threshold value may be referred to as the pressure release condition (2).
  • the third pressure threshold value may be smaller than the first pressure threshold value.
  • the third pressure threshold value may be the same value as the second pressure threshold value.
  • the control unit 60 switches the control mode of the solenoid valve 16 from the purge mode to the normal mode (step S18). That is, the control unit 60 controls the opening and closing of the solenoid valve 16 in the control mode in which the flow path of the discharged air is switched according to the tank pressure.
  • the second flow path is blocked by the solenoid valve 16, and the supply of the indicated pressure from the compressor 11 to the purge valve 131 is stopped. Therefore, the purge process in the air dryer 13 is stopped. Further, the supply of discharged air to the air dryer 13 is started.
  • the control unit 60 measures the time from the time when the tank pressure reaches Pt1 most recently, and compares the measured time with the reference pressure time TS4.
  • the reference pressure time TS4 is a value set to prevent the period in which the filling rate of the main tank 14 does not reach close to 100% from being prolonged, and is, for example, 12 minutes.
  • the reference pressure time TS4 is shorter than the reference pressure time TS3.
  • the reference pressure time TS4 may be the same as the reference pressure time TS3.
  • the reference pressure time TS4 may be a value equal to or greater than the reference pressure time TS3.
  • the time from the time when the tank pressure reaches Pt1 most recently is the reference pressure time TS4 or more, which is referred to as the air amount release condition (2).
  • step S25 When the time when the tank pressure does not reach Pt1 is less than the reference pressure time TS4 (NO in step S25), the control unit 60 moves to the process of step S24. When the time when the tank pressure does not reach Pt1 is equal to or longer than the reference pressure time TS4 (YES in step S25), the control unit 60 executes the process of step S18. After that, the control unit 60 proceeds to step S11.
  • the control unit 60 switches the control mode of the solenoid valve 16 from the normal mode to the purge mode (steps S15 and S23), and notifies the occupant of the vehicle 100 that the forced purge period is in progress through the output unit (not shown). At this time, the control unit 60 may announce through the output unit that the forced purge period is in effect, may display a screen for displaying characters indicating that the forced purge period is in effect, or display the announcement and the screen display. It may be notified in combination.
  • the forced purge period is a period during which the solenoid valve 16 is controlled in the purge mode. In other words, the period during which the second flow path is open and the indicated pressure is supplied to the purge valve 131. That is.
  • control unit 60 switches the control mode of the solenoid valve 16 from the purge mode to the normal mode (step S18), and notifies the occupant of the vehicle 100 that the forced purge period has been canceled through the output unit.
  • the control unit 60 may announce through the output unit that the forced purge period has been canceled, or may display a screen for displaying characters indicating that the forced purge period has been canceled. Notification may be performed in combination with the screen display.
  • the forced purge period is released from the forced purge period to the normal purge period in which the solenoid valve 16 is controlled in the normal mode.
  • the normal purge period is also a period in which the indicated pressure is supplied to the purge valve 131 according to the magnitude of the tank pressure.
  • control unit 60 may notify the forced purge period through the output unit as shown below.
  • the control unit 60 gives the notification shown in (3) through the output unit, the occupant of the vehicle 100 is in a situation where the purge system 1 does not shift to the forced purge period even though the purge instruction button is pressed. You can know that there is.
  • control unit 60 controls the solenoid valve 16 on the condition that only one of the supply amount condition (1), the supply amount condition (2), and the purge time condition is satisfied. Control mode can be switched from normal mode to purge mode.
  • control unit 60 can determine whether or not the supply amount 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.
  • the control unit 60 can determine that the supply amount condition (1) is satisfied.
  • the control unit 60 measures the time from the air supply start time to the current time, and compares the measured time with the first predetermined time.
  • the first predetermined time is determined based on the permissible 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, 1 minute and 36 seconds may be determined as the first predetermined time, and 2 minutes and 12 seconds may be determined. It may be determined at the first predetermined time. Note that 1 minute and 36 seconds is the time required for the air of 240 L from the compressor 11 to be supplied to the air dryer 13. Further, 2 minutes and 12 seconds is the time required for the air of 330 L from the compressor 11 to be supplied to the air dryer 13.
  • the amount of water and oil that can be additionally absorbed by the desiccant D is relatively small.
  • the air supply amount from the compressor 11 to the air dryer 13 in the above-mentioned predetermined period becomes the first. It is possible to determine whether or not one flow rate threshold has been reached, that is, whether or not the supply amount condition (1) has been satisfied.
  • the control unit 60 measures the time elapsed from the air supply start time, and the measurement is performed based on the measured time and the air supply speed of the compressor 11 when the compressor 11 is supplying air to the air dryer 13. Calculate the cumulative air flow (that is, the air supply) over the time. Then, when the calculated cumulative air flow rate reaches the first flow rate threshold value, the control unit 60 can determine that the supply amount condition (1) is satisfied. In this way, by calculating the air supply amount based on the elapsed time from the air supply start time and the air supply speed of the compressor 11, the control unit 60 can supply air to the air dryer 13 while the compressor 11 is supplying air.
  • the air supply start time is T11
  • the air supply speed from time T11 to time T12 one minute later is 100 L / min
  • the air supply speed of the compressor 11 from time T12 to the current time one minute later is 150 L / min. If it is minutes, the control unit 60 can calculate the air supply amount from the air supply time to the current time as 250L (100L + 150L).
  • the air supply speed depends on the rotation speed of the motor 12 that drives the compressor 11.
  • control unit 60 can determine whether or not the supply amount 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.
  • the second predetermined time is determined based on the permissible 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 may be determined as the second predetermined time, and 3 minutes may be determined as the second predetermined time. May be decided. 2 minutes is the time required to supply 300 L of air from the compressor 11 to the air dryer 13. Further, 3 minutes is the time required for the air of 450 L from the compressor 11 to be supplied to the air dryer 13.
  • the second predetermined time When the second predetermined time has passed from the air supply start time, it means that the amount of water and oil that can be additionally absorbed by the desiccant D is very small.
  • the air supply amount from the compressor 11 to the air dryer 13 in the above-mentioned predetermined period becomes the second. 2 It is possible to determine whether or not the flow rate threshold has been reached, that is, whether or not the supply amount condition (2) has been satisfied.
  • the control unit 60 measures the time elapsed from the air supply start time, and the measurement is performed based on the measured time and the air supply speed of the compressor 11 when the compressor 11 is supplying air to the air dryer 13. Calculate the cumulative air flow (that is, the air supply) over the time. Then, when the calculated cumulative air flow rate reaches the second flow rate threshold value, the control unit 60 can determine that the supply amount condition (2) is satisfied.
  • the purge system 1 of the present embodiment is subject to satisfying only one of the supply amount condition (1), the supply amount condition (2), and the purge time condition.
  • the second flow path for supplying the indicated pressure from the compressor 11 to the purge valve 131 from the first flow path which is the flow path for supplying air from the compressor 11 to the air dryer 13, is the flow path for the discharged air. You can switch to the flow path.
  • the purge system 1 of the present embodiment can supply the indicated pressure to the purge valve 131 and cause the air dryer 13 to execute the purge process regardless of the tank pressure.
  • the frequency of the purging treatment (that is, the regeneration treatment of the desiccant D) in the air dryer 13 can be increased, so that the load on the desiccant D of the air dryer 13 can be reduced.
  • the desiccant D is less likely to deteriorate, and the life of the air dryer 13 and the desiccant D can be extended.
  • poor moisture absorption of the desiccant D is less likely to occur.
  • the purge system 1 of the present embodiment supplies the indicated pressure from the compressor 11 to the purge valve 131, the air in the main tank 14 is not consumed as the indicated pressure. Therefore, the amount of air that can be used by the air device of the vehicle 100 increases.
  • the purge system 1 of the present embodiment can supply air to the main tank 14 and supply the indicated pressure to the purge valve 131 according to the tank pressure. can.
  • the control unit 60 can switch the control mode of the solenoid valve 16 from the normal mode to the purge mode. Therefore, when the amount of air supplied to the air dryer 13 by the compressor 11 in a predetermined period is large, the control mode is switched to the purge mode, and the flow path of the discharged air is switched from the first flow path to the second flow path.
  • the indicated pressure can be supplied to the purge valve 131.
  • the purging process is executed in consideration of the amount of water and oil that can be absorbed by the desiccant D of the air dryer 13 without waiting until the air filling rate of the main tank 14 becomes close to 100%.
  • the second pipe 22 by using a method of determining whether or not the supply amount conditions (1) and (2) are satisfied by a method of calculating the air supply amount based on the measured value D1 of the flow rate sensor 41. Since the air flow rate of the air is directly measured, a more accurate air supply amount can be calculated.
  • the purge system 1 does not include the flow rate sensor 41. It is possible to determine whether the amount of air supplied to the air dryer 13 is large or small.
  • the purge system 1 can be used. Without providing the flow rate sensor 41, it is possible not only to determine whether the amount of air supplied to the air dryer 13 is large or small, but also to accurately calculate the amount of air supplied even when the supply speed of the compressor 11 changes. can.
  • control unit 60 can switch the control mode of the solenoid valve 16 from the normal mode to the purge mode. As a result, it is possible to detect that the desiccant D has not been sufficiently regenerated and to execute the purging process.
  • the control unit 60 not only satisfies any of the supply amount condition (1), the supply amount condition (2), and the purge time condition, but also satisfies the minimum pressure auxiliary condition, and the solenoid valve 16 Control mode can be switched from normal mode to purge mode.
  • the control unit 60 keeps the control mode of the solenoid valve 16 as the normal mode. That is, when the tank pressure is low immediately after the vehicle 100 is started, the flow path of the discharged air remains the first flow path, so that air is supplied from the compressor 11 to the main tank 14 via the air dryer 13. Therefore, the air in the main tank 14 can be filled at an early stage.
  • the control unit 60 not only satisfies any of the supply amount condition (1), the supply amount condition (2), and the purge time condition, but also includes the air amount auxiliary condition (1) or the air amount auxiliary condition (2).
  • the control mode of the solenoid valve 16 can be switched from the normal mode to the purge mode on condition that the above conditions are satisfied. As a result, when the tank pressure is Pt2 or higher but it takes a long time to rise to Pt1, the main tank 14 is filled with air while leaving the discharge air flow path as the first flow path. Can be prioritized.
  • the control unit 60 switches the control mode of the solenoid valve 16 to the normal mode. Then, when the flow path of the discharged air is switched from the second flow path to the first flow path, the indicated pressure is not supplied to the purge valve 131, and the purge process in the air dryer 13 is stopped. Therefore, the amount of air in the main tank 14 can be secured so that the air device can always use the air in the main tank 14.
  • the control unit 60 switches the control mode of the solenoid valve 16 from the purge mode to the normal mode.
  • the discharged air is supplied to the main tank 14 instead of the purge valve 131. Therefore, when it takes time for the tank pressure to rise to Pt1 such as when the amount of air used is large, the main tank The period during which the filling rate of 14 does not approach 100% can be shortened.
  • ⁇ Modification example 1> when the supply amount condition (1) is satisfied in addition to the intention condition, the control unit 60 switches the control mode of the solenoid valve 16 from the normal mode to the purge mode.
  • the purge system 1 of the modification 1 switches the control mode of the solenoid valve 16 from the normal mode to the purge mode when the intention condition is satisfied regardless of the supply amount condition (1).
  • the purge system 1 according to the modified example 1 will be mainly described in that it differs from the above-described embodiment.
  • FIG. 4 is a flowchart showing a control example of the solenoid valve 16 executed by the purge system 1 according to the modification 1. The steps showing the same control as in FIG. 3 are assigned the same step numbers. Before the process shown in FIG. 4 is started, it is assumed that the solenoid valve 16 is controlled in the normal mode.
  • control unit 60 determines whether or not the tank pressure is equal to or higher than the first pressure threshold value (step S11). When the tank pressure is smaller than the first pressure threshold value (NO in step S11), the control mode of the solenoid valve 16 is maintained in the normal mode (step S14), and the process returns to the process of step S11.
  • step S11 When the tank pressure is equal to or higher than the first pressure threshold value (YES in step S11), the control unit 60 determines whether or not the purge instruction button has been pressed (step S31). If the purge instruction button is not pressed (NO in step S31), the control unit 60 executes the process of step S14 and returns to step S11.
  • step S31 When the purge instruction button is pressed (YES in step S31), the control unit 60 switches the control mode of the solenoid valve 16 from the normal mode to the purge mode (step S16). That is, when the purge instruction button is pressed, the control unit 60 switches the control mode of the solenoid valve 16 from the normal mode to the purge mode regardless of whether the supply amount condition (1) is satisfied.
  • the control unit 60 determines whether or not the tank pressure is smaller than the first pressure threshold value (step S32). When the tank pressure is equal to or higher than the first pressure threshold value (NO in step S32), the control unit 60 repeats the process of step S32 until the tank pressure becomes smaller than the first pressure threshold value. When the tank pressure is smaller than the first pressure threshold value (YES in step S32), the control unit 60 switches the control mode of the solenoid valve 16 from the normal mode to the purge mode (step S18). Then, the process returns to step S11.
  • the tank pressure may be compared with the second pressure threshold or the third pressure threshold.
  • the control unit 60 switches the control mode of the solenoid valve 16 to the purge mode regardless of whether the supply amount condition (1) is satisfied. Therefore, the purging process can be executed by giving priority to the intention of the occupant of the vehicle 100.
  • control unit 60 When the control unit 60 satisfies both the intention condition and the minimum pressure auxiliary condition, the control unit 60 switches the control mode of the solenoid valve 16 to the purge mode, so that the occupant of the vehicle 100 desires to execute the purge process. Even so, when the tank pressure is small, the flow path of the discharged air is the first flow path, so that the main tank 14 can be filled with air.
  • FIG. 5 is a diagram showing a main configuration of a purge system 1 included in the vehicle 100 according to the second modification.
  • the solenoid valve 16 of the purge system 1 according to the first modification includes a first valve 161 and a second valve 162 which are directional valves. Further, the third pipe 23 of the purge system 1 according to the first modification includes a fourth pipe 231 connecting the first valve 161 and the second valve 162, and the second valve 162 and the purge valve 131. It is provided with a fifth pipe 232 to be connected.
  • the first valve 161 switches the inflow destination of the discharged air between the second pipe 22 and the fourth pipe 231 under the control of the control unit 60. Specifically, the first valve 161 switches the pipe to which the first pipe 21 is connected between the second pipe 22 and the fourth pipe 231.
  • the second valve 162 is provided in the third pipe 23.
  • the second valve 162 is connected to the first valve 161 via the fourth pipe 231 and is connected to the purge valve 131 via the fifth pipe 232.
  • the second valve 162 opens the third pipe 23 at the timing when the flow path of the discharged air is switched from the first flow path to the second flow path. Opening the third pipe 23 means connecting the fourth pipe 231 and the fifth pipe 232 so that the air in the fourth pipe 231 can flow into the fifth pipe 232. ..
  • the second valve 162 connects the fifth pipe 232 to the atmospheric communication pipe 24 at the timing when the flow path of the discharged air is switched from the second flow path to the first flow path.
  • the purge valve 131 and the atmosphere communicate with each other.
  • control unit 60 switches the flow path of the discharge air from the first flow path to the second flow path at the timing of supplying the instruction pressure, and at the timing of stopping the supply of the instruction pressure.
  • the flow path of the discharged air is switched from the second flow path to the first flow path.
  • switching the flow path of the discharged air from the first flow path to the second flow path means that the first valve 161 connects the first pipe 21 to the second pipe 22 to the second.
  • the second valve 162 switches the connection destination of the fifth pipe 232 from the atmospheric communication pipe 24 to the fourth pipe 231 by switching to the pipe 231 of the fourth pipe 231.
  • the discharge air is a purge valve through the first pipe 21, the fourth pipe 231 and the fifth pipe 232 as an instruction pressure. It is supplied to 131.
  • switching the flow path of the discharged air from the second flow path to the first flow path means that the first valve 161 connects the first pipe 21 to the fourth pipe 231.
  • the second valve 162 switches the connection destination of the fifth pipe 232 from the fourth pipe 231 to the atmospheric communication pipe 24.
  • the discharge air is supplied to the main tank 14 via the first pipe 21, the second pipe 22, and the air dryer 13. Will be.
  • control unit 60 Other configurations and control contents by the control unit 60 are the same as those in the above-described embodiment. Further, according to the purge system 1 according to the modification 1, the same effect as that of the purge system 1 according to the above-described embodiment can be obtained.
  • the pressure detection unit When the pressure detection unit detects that the pressure in the third pipe 23 connecting the solenoid valve 16 and the purge valve 131 (hereinafter referred to as the valve upstream pressure) has reached the pressure value Pg, the pressure detection unit is an ON signal. When the detection signal is transmitted to the control unit 60 and it is detected that the valve upstream pressure has fallen below the pressure value Pg, the low pressure detection signal, which is an OFF signal, is transmitted to the control unit 60.
  • the pressure value Pg is, for example, 1000 kPa.
  • the pressure value Pg may be determined based on an acceptable value in the third pipe 23.
  • the control unit 60 switches the flow path of the discharged air from the first flow path to the second flow path. .. As a result, the indicated pressure is supplied to the purge valve 131 through the third pipe 23. Then, when the valve upstream pressure reaches Pg, the pressure detection unit transmits a high pressure detection signal to the control unit 60. When the control unit 60 receives the high pressure detection signal, the control unit 60 stops driving the compressor 11. As a result, air is not supplied to the third pipe 23, and as a result, it is possible to prevent the valve upstream pressure from becoming too large.
  • control unit 60 While the control unit 60 is controlling the solenoid valve 16 in the purge mode, when the valve upstream pressure reaches the pressure value Pg, the control unit 60 receives a high pressure detection signal and stops driving the compressor 11. Let me. As a result, air is not supplied to the third pipe 23, and as a result, it is possible to prevent the valve upstream pressure from becoming too large.
  • control unit 60 starts driving the compressor 11 at the timing when the control mode of the solenoid valve 16 is switched to the normal mode, and the discharge air flow path is first from the second flow path. Switch to the flow path of. As a result, air is supplied to the main tank 14.
  • control unit 60 may rotate the motor 12 at a minute rotation speed instead of stopping the drive of the compressor 11 when the high pressure detection signal is received.
  • the minute rotation speed is the rotation speed of the motor 12 that can be driven from the compressor 11 toward the first pipe 21 to the extent that air is not discharged. That is, when the control unit 60 receives the high pressure detection signal from the pressure detection unit, the control unit 60 stops the discharge of air toward the first pipe 21, and when the tank pressure drops to Pt2, the first pipe 21 The discharge of air toward the air may be started.
  • control unit 60 Other configurations and control contents by the control unit 60 are the same as those in the above-described embodiment. Further, according to the purge system 1 according to the modification 3, the same effect as that of the purge system 1 according to the above-described embodiment can be obtained. If the solenoid valve 16 includes two valves (first valve 161 and second valve 162) as in the second modification, the third pipe 23 is the fourth pipe 231 and the fifth pipe 232. The pressure detection unit is provided in the fifth pipe 232.
  • the control unit 60 sets the control unit 60 on the condition that only the intention condition is satisfied regardless of whether or not the minimum pressure auxiliary condition, the air amount auxiliary condition (1) and the air amount auxiliary condition (2) are satisfied.
  • the control mode of the electromagnetic valve 16 may be switched from the normal mode to the purge mode.
  • the occupant of the vehicle 100 can execute the purge process at an arbitrary timing. Therefore, the purging process can be performed at a high frequency to reduce the load on the desiccant D and make the desiccant D less likely to deteriorate. As a result, the life of the air dryer 13 and the desiccant D can be extended.
  • the control unit 60 may switch the control mode of the solenoid valve 16 from the normal mode to the purge mode when the operation of the vehicle 100 is stopped (stop condition), that is, when the vehicle 100 is turned off.
  • stop condition the operation of the vehicle 100 is stopped
  • the control unit 60 receives the stop operation detection signal S3
  • the control unit 60 determines that the stop condition is satisfied.
  • the purge system 1 further includes a start operation detection unit that transmits a start operation detection signal to the control unit 60 to notify that the start of the operation of the vehicle 100 has been detected when the operation to start the operation of the vehicle 100 is detected. You may be. Then, when the control unit 60 receives the start operation detection signal, the control mode of the solenoid valve 16 may be switched from the purge mode to the normal mode. As a result, when the tank pressure becomes Pt2 or less, the flow path of the discharged air is switched from the second flow path to the first flow path.
  • the operation of stopping the operation of the vehicle 100 is, for example, an operation of turning on the ignition key or the engine key.
  • the discharge air flow path becomes the second flow path according to the tank pressure after the operation of the vehicle 100 starts. It has been switched to the normal mode that can be switched between the first flow path and the second flow path. Therefore, immediately after the operation of the vehicle 100 is started, it becomes easy to fill the main tank 14 with air at an early timing.
  • control unit 60 refers to the number of times the flow path of the discharged air is switched from the first flow path to the second flow path (hereinafter, referred to as the number of times of switching) after the latest time when the tank pressure reaches Pt1. ) May be counted. The control unit 60 then continues counting until the time when the tank pressure reaches Pt1. The number of switching corresponds to the number of times the control mode is switched from the normal mode to the purge mode after the latest time when the tank pressure reaches Pt1.
  • the control unit 60 may switch the control mode of the solenoid valve 16 from the normal mode to the purge mode.
  • the threshold number is a value set in order to prevent the period in which the filling rate of the main tank 14 does not reach close to 100% from being prolonged, and is, for example, three times.
  • control unit 60 imposes the number-of-times auxiliary condition, the minimum pressure condition, the air amount auxiliary condition (1), and the air amount auxiliary condition (2) as conditions for switching the control mode of the solenoid valve 16 to the purge mode. It is sufficient that at least one of them is set, and if two or more are imposed, any combination may be imposed.
  • control unit 60 when the solenoid valve 16 is controlled in the purge mode, the counted number of switching times is equal to or greater than the threshold number (number release assisting condition), and the pressure release condition (1) and pressure. When any of the release conditions (2) is satisfied, the control unit 60 may switch the control mode of the solenoid valve 16 to the normal mode.
  • the threshold number of times when the intention condition is not satisfied may be smaller than the threshold number of times when the intention condition is satisfied.
  • the number of times determined when the intention condition is satisfied and the mode is switched to the purge mode is more than the number of times determined when the intention condition is not satisfied and the mode is switched to the purge mode, rather than the threshold number of the release auxiliary condition.
  • the threshold number of cancellation assistance conditions may be small.
  • a flow velocity sensor may be provided instead of the flow rate sensor 41.
  • 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.
  • 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.
  • control unit 60 switches the control mode of the solenoid valve 16 to the purge mode, and changes the flow path of the discharged air from the first flow path to the second flow path.
  • the indicated pressure may be supplied to the purge valve 131 by switching to the flow path.
  • the compressor 11 does not necessarily have to be an electric compressor, but may be a compressor that operates in conjunction with the operation of a drive source such as an engine.
  • vehicle 100 has been described as a large vehicle in the above-described embodiment, any vehicle may be used as long as it is equipped with a device that uses air.
  • purge system 1 described above may be mounted not only on the vehicle 100 but also on any device that uses air.
  • the present disclosure can be suitably applied to a purge system that regenerates a desiccant in an air dryer by a purge process.
  • Purge system 11 Compressor 12 Motor 13 Air dryer 131 Purge valve 14 Main tank 16 Solenoid valve 161 First valve 162 Second valve 18 Security valve 21 First piping 22 Second piping 23 Third piping 231 Fourth piping 232 Fifth piping 24 Air communication piping 32 Pressure sensor 41 Flow sensor 42 Stop operation detection unit 43 Instruction operation detection unit 60 Control unit 100 Vehicle S3 Stop operation detection signal S5 Instruction operation detection signal D0, D1 Measured values

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Gases (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Abstract

La présente invention concerne un système de purge qui comprend : un sécheur d'air qui comprend une vanne de purge et fournit, à un réservoir principal, de l'air évacué d'un compresseur et s'écoulant à travers un premier trajet d'écoulement ; une électrovanne qui commute un trajet d'écoulement de l'air évacué entre le premier trajet d'écoulement et un second trajet d'écoulement à travers lequel l'air évacué est fourni à la vanne de purge ; et une unité de commande qui commute le trajet d'écoulement de l'air du premier trajet d'écoulement vers le second trajet d'écoulement lorsqu'au moins l'une des conditions suivantes est satisfaite : lorsqu'une opération prédéfinie est détectée, lorsqu'il est déterminé que la quantité d'air fournie au sécheur d'air pendant une période prédéfinie est supérieure ou égale à une première valeur de seuil, et lorsque la durée entre le moment où l'électrovanne démarre l'alimentation en air de la vanne de purge et le moment où l'électrovanne arrête l'alimentation en air de la vanne de purge est inférieure à un temps de référence.
PCT/JP2021/012871 2020-03-30 2021-03-26 Système de purge et véhicule WO2021200659A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020060542A JP2021160367A (ja) 2020-03-30 2020-03-30 パージシステムおよび車両
JP2020-060542 2020-03-30

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Publication Number Publication Date
WO2021200659A1 true WO2021200659A1 (fr) 2021-10-07

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0470567U (fr) * 1990-10-31 1992-06-23
JP2004526628A (ja) * 2001-05-31 2004-09-02 ワブコ オートモーティブ ユーケー リミテッド 空気乾燥機の再生
JP2015229127A (ja) * 2014-06-03 2015-12-21 日野自動車株式会社 エア供給システム

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0470567U (fr) * 1990-10-31 1992-06-23
JP2004526628A (ja) * 2001-05-31 2004-09-02 ワブコ オートモーティブ ユーケー リミテッド 空気乾燥機の再生
JP2015229127A (ja) * 2014-06-03 2015-12-21 日野自動車株式会社 エア供給システム

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