WO2021200887A1 - Purge system and vehicle - Google Patents

Purge system and vehicle Download PDF

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Publication number
WO2021200887A1
WO2021200887A1 PCT/JP2021/013440 JP2021013440W WO2021200887A1 WO 2021200887 A1 WO2021200887 A1 WO 2021200887A1 JP 2021013440 W JP2021013440 W JP 2021013440W WO 2021200887 A1 WO2021200887 A1 WO 2021200887A1
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WO
WIPO (PCT)
Prior art keywords
purge
pressure
time
valve
air
Prior art date
Application number
PCT/JP2021/013440
Other languages
French (fr)
Japanese (ja)
Inventor
徹 秋庭
史朗 池本
哲也 熊田
Original Assignee
いすゞ自動車株式会社
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Publication of WO2021200887A1 publication Critical patent/WO2021200887A1/en

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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.
  • the desiccant When the desiccant is regenerated, dirty air is discharged to the outside of the air dryer, which pollutes the ground and surrounding 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.
  • a sound is generated when air is discharged to the outside of the air dryer.
  • 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 vehicle equipped with a purge system and a purge system that reduce the frequency of desiccant regeneration operations in an air dryer.
  • One aspect of the purge system of the present disclosure includes a main tank, a compressor for discharging air, a purge valve, an air dryer for supplying the air discharged from the compressor to the main tank, and the inside of the main tank.
  • the tank pressure which is the pressure of
  • the tank pressure is smaller than the first pressure value. Controlled in one of a first control mode in which the supply of the indicated pressure is stopped when the value drops to a value and a second control mode in which the supply of the indicated pressure is stopped regardless of the tank pressure.
  • the purge control valve to be operated and the purge control valve are controlled, that a predetermined operation is detected, and that the amount of air supplied to the air dryer by the compressor during a predetermined period is less than the first threshold value. That, and at least one of the time from the time when the purge control valve starts supplying the indicated pressure to the time when the purge control valve stops supplying the indicated pressure is equal to or longer than the reference time is satisfied.
  • a control unit for switching the control mode of the purge control valve from the first control mode to the second control mode is provided.
  • 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 illustrating drive start and drive stop of the compressor executed by the purge system according to the embodiment.
  • FIG. 3 is a flowchart showing a control example of the purge control valve executed by the purge system according to the embodiment.
  • FIG. 4A is a diagram showing a purge control valve included in the purge system according to the first modification.
  • FIG. 4B is a diagram showing a purge control valve included in the purge system according to the first modification.
  • FIG. 5 is a diagram showing a main configuration of the purge system 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 purge control valve 16, a pressure sensor 17, a flow rate sensor 41, an open / close detection unit 42, an operation detection unit 43, an output unit 50, and a control unit 60. It has.
  • 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 discharged from the compressor 11, and supplies the removed air 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, 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, and is supplied from the main tank 14.
  • 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 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 purge control valve 16 is a solenoid valve. It is provided in a pipe (hereinafter, referred to as an indicated pressure supply pipe) 21 connecting the main tank 14 and the purge valve 131.
  • the purge control valve 16 opens and closes the instruction pressure supply pipe 21 under the control of the control unit 60 to supply the instruction pressure from the main tank 14 to the purge valve 131 and stop the supply of the instruction pressure.
  • supplying the indicated pressure means supplying the air in the main tank 14 to the purge valve 131.
  • the indicated pressure is supplied to the purge valve 131 when the purge control valve 16 opens the indicated pressure supply pipe 21, and is not supplied to the purge valve 131 when the purge control valve 16 closes the indicated pressure supply pipe 21.
  • the purge control valve 16 is a directional valve, and when the indicated pressure supply pipe 21 is closed, the purge valve 131 communicates with the atmosphere.
  • the pressure sensor 17 is attached to the main tank 14.
  • the pressure sensor 17 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 17 may be provided in a pipe connecting the air dryer 13 and the main tank 14. Further, the pressure sensor 17 may be provided on the upstream side of the purge control valve 16 in the indicated pressure supply pipe 21.
  • the flow rate sensor 41 is provided in the 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.
  • 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. If so, a closing signal S4 notifying that the operation to close the door is 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.
  • 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.
  • 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 that combines a speaker and a display unit.
  • 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.
  • canceling the purge process corresponds to the control unit 60 controlling the purge control valve 16 in the shutoff mode, and the control unit 60 cancels the cancellation of the purge process by the purge control valve 16.
  • the control unit 60 cancels the cancellation of the purge process by the purge control valve 16.
  • the cutoff mode corresponds to switching from cutoff mode to normal mode. The cutoff mode and the normal mode will be described in detail later.
  • the control unit 60 controls the entire purge system 1. More specifically, the control unit 60 controls the opening and closing of the purge control valve 16 and drives the motor 12 based on various signals S3, S4, S5, and the measured values D0 and D1. Control (that is, compressor drive control) is performed.
  • 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 of purge control valve The control unit 60 controls the purge control valve 16 in either a normal mode or a shutoff mode.
  • the indicated pressure supply pipe 21 is opened by the purge control valve 16 when the tank pressure reaches the pressure value Pt1, and the indicated pressure supply pipe 21 is purged when the tank pressure drops to the pressure value Pt2.
  • This is a control mode in which the block is closed by 16. Opening the instruction pressure supply pipe 21 by the purge control valve 16 corresponds to starting the supply of the instruction pressure, and closing the instruction pressure supply pipe 21 by the purge control valve 16 stops the supply of the instruction pressure.
  • the control unit 60 controls the purge control valve 16 based on the measured value D0 of the pressure sensor 17.
  • 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 the value of the pressure supplied from the main tank 14 to the purge valve 131, which is 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 air dryer 13 by the compressor 11.
  • the cutoff mode is a control mode that stops the supply of the indicated pressure regardless of the tank pressure.
  • the control mode is the shutoff mode, the control unit 60 maintains the instruction pressure supply pipe 21 blocked by the purge control valve 16.
  • the motor 12 may be rotated at a minute rotational speed instead of stopping the driving 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 determines that the measured value D0 of the pressure sensor 17 has reached the pressure value Pt1, the air supply to the air dryer 13 by the compressor 11 is stopped, and the measured value D0 of the pressure sensor 17 is the pressure value. If it is determined that the pressure has dropped to Pt2, the air supply to the air dryer 13 by the compressor 11 may be started. In the following description, when the control unit 60 determines that the measured value D0 of the pressure sensor 17 has reached the pressure value Pt1, the drive of the compressor 11 will be stopped.
  • 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.
  • the upper graph of FIG. 2 shows the time change of the tank 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 purge control valve 16 is in the state of supplying the indicated pressure.
  • 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 determines the measured value D0 of the pressure sensor 17. It is determined that the pressure has decreased to Pt2. Then, at time T01, the control unit 60 starts driving the compressor 11 and closes the instruction pressure supply pipe 21 by the purge control valve 16. When the indicated pressure supply pipe 21 is closed, the supply of the indicated pressure to the purge valve 131 is stopped.
  • the control unit 60 determines that the measured value D0 of the pressure sensor 17 has reached Pt1. Then, at time T02, the control unit 60 stops the drive of the compressor 11 and opens the instruction pressure supply pipe 21 by the purge control valve 16. When the indicated pressure supply pipe 21 is opened, supply of the indicated pressure to the purge valve 131 is started.
  • the control unit 60 determines that the measured value D0 of the pressure sensor 17 has dropped to Pt2. Then, at time T03, the control unit 60 starts driving the compressor 11 and closes the instruction pressure supply pipe 21 by the purge control valve 16. When the indicated pressure supply pipe 21 is closed, the supply of the indicated pressure to the purge valve 131 is stopped.
  • the control unit 60 determines that the measured value D0 of the pressure sensor 17 has reached Pt1. Then, at time T04, the control unit 60 stops the drive of the compressor 11 and opens the instruction pressure supply pipe 21 by the purge control valve 16. When the indicated pressure supply pipe 21 is opened, supply of the indicated pressure to the purge valve 131 is started.
  • the purge control valve 16 supplies the indicated pressure and stops the supply of the indicated pressure according to the change in the tank pressure.
  • the purge control valve 16 starts supplying the indicated pressure from the time when the purge control valve 16 starts supplying the indicated pressure to the time when the purge control valve 16 starts supplying the indicated pressure again, or the purge control valve 16 starts supplying the indicated pressure.
  • One cycle is from the time when the supply of the indicated pressure is stopped to the time when the purge control valve 16 stops supplying the indicated pressure again. For example, in FIG. 2, the time from time T02 to time T04 corresponds to one cycle.
  • FIG. 3 is a flowchart showing a control example of the purge control 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 purge control valve 16 in the normal mode.
  • 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.
  • step S12 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).
  • the predetermined period corresponds to the period from the time when the tank pressure drops to Pt2 to the time when the tank pressure reaches Pt1 next, for example, from time T01 to time T02 in FIG.
  • the period is the period from time T03 to time T04.
  • the predetermined period corresponds to the time (that is, the driving 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.
  • 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.
  • 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, 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.
  • the amount of air supplied during the predetermined period is less 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.
  • 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.
  • 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).
  • control unit 60 When the air supply amount 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 control mode of the purge control valve 16 in the normal mode (step S14), and proceeds to step S12.
  • control unit 60 switches the control mode of the purge control valve 16 from the normal mode to the shutoff mode (step S15).
  • the instruction pressure supply pipe 21 is closed by the purge control valve 16, so that the instruction pressure is not supplied to the purge valve 131, and the purge process is not executed in the air dryer 13.
  • 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).
  • the indicated pressure stop time is the most recent time when the purge control valve 16 closes the indicated pressure supply pipe 21.
  • the control mode is switched to the cutoff mode while the purge control valve 16 is opening the indicated pressure supply pipe 21
  • the time when the cutoff mode is switched becomes the indicated pressure stop time.
  • the control mode is switched to the shutoff mode while the purge control valve 16 closes the indicated pressure supply pipe 21
  • the most recent time when the purge control valve 16 closes the indicated pressure supply pipe 21 in the normal mode that is, The most recent time when the tank pressure drops below Pt2 is the indicated pressure stop time.
  • the indicated pressure stop time is the time when the shutoff mode is switched. ..
  • the indicated pressure stop time is the latest time when the tank pressure drops to Pt2 or less. 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.
  • 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.
  • the air supply amount from the indicated pressure stop time to the current time 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 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.
  • step S16 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.
  • control unit 60 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 normally changes the control mode of the purge control valve 16 from the shutoff mode. Switch to the mode (step S17).
  • the time when the control mode of the purge control valve 16 is switched from the shutoff mode to the normal mode (hereinafter referred to as the release time) is immediately after the time when the tank pressure reaches Pt1 and the tank pressure is Pt2.
  • the control unit 60 switches the control mode to the normal mode and causes the purge control valve 16 to open the instruction pressure supply pipe 21.
  • the control unit 60 sets the control mode to the normal mode. After the tank pressure reaches Pt1, the indicated pressure supply pipe 21 is opened by the purge control valve 16.
  • the control unit 60 may switch the control mode of the purge control valve 16 from the shutoff mode to the normal mode and open the instruction pressure supply pipe 21 by the purge control valve 16 regardless of the release time.
  • step S12 the indicated pressure supply pipe 21 is blocked by the purge control valve 16, so that the indicated pressure is not supplied to the purge valve 131, and the purge process is not executed in the air dryer 13.
  • the control unit 60 executes the process of step S12.
  • the control unit 60 determines whether or not the door of the vehicle 100 is open (step S18).
  • 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.
  • the door of the vehicle 100 it is assumed that the vehicle 100 is stopped.
  • 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.
  • 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 when the purge control valve 16 starts supplying the indicated pressure to the purge valve 131 (that is, the time when the tank pressure reaches Pt1) and the time when the supply of the indicated pressure is stopped (that is, the tank pressure is Pt2). It is the time until just before (the time when it decreased below).
  • 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.
  • the fact that the latest purge time is equal to or longer 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 90 seconds, which is a value of 150% 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 tank pressure drops to Pt2 or less and the purging process is completed in a situation where the water and oil content of the desiccant D is not sufficiently removed.
  • step S19 When the purge time is less than the reference time (NO in step S19), the control unit 60 maintains the control mode of the purge control valve 16 in the normal mode (step S14), and proceeds to step S12.
  • control unit 60 determines whether or not the amount of air supplied during the predetermined period described above is less than the third flow rate threshold value (step S20).
  • 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.
  • 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.
  • control unit 60 When the air supply amount 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 control mode of the purge control valve 16 in the normal mode (step S14), and proceeds to step S12.
  • control unit 60 switches the control mode of the purge control valve 16 from the normal mode to the shutoff mode (step S21).
  • the instruction pressure supply pipe 21 is closed by the purge control valve 16, so that the instruction pressure is not supplied to the purge valve 131, and the purge process is not executed in the air dryer 13.
  • 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.
  • 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.
  • the air supply amount from the indicated pressure stop time to the current time reaches the fourth flow rate threshold value, it means that the amount of water and oil that can be additionally absorbed by the desiccant D is reduced.
  • 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.
  • step S22 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.
  • step S22 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 normally changes the control mode of the purge control valve 16 from the shutoff mode. Switch to the mode (step S23). As a result, the instruction pressure supply pipe 21 is closed by the purge control valve 16, so that the instruction pressure is not supplied to the purge valve 131, and the purge process is not executed in the air dryer 13. After that, the control unit 60 executes the process of step S12.
  • step S18 When it is determined that the door of the vehicle 100 is open (YES in step S18), the control unit 60 switches the control mode of the purge control valve 16 from the normal mode to the shutoff mode (step S21). As a result, the instruction pressure supply pipe 21 is closed by the purge control valve 16, so that the instruction 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 S22.
  • the control unit 60 switches the control mode of the purge control valve 16 from the normal mode to the shutoff mode (steps S15 and S21), and notifies the occupant of the vehicle 100 that the purge process is being canceled through the output unit 50.
  • 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.
  • control unit 60 switches the control mode of the purge control valve 16 from the shutoff mode to the normal mode (steps S17 and S23), and notifies the occupants of the vehicle 100 that the purge cancellation has been canceled through the output unit 50. ..
  • 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.
  • control unit 60 may give a notification regarding purge cancellation through the output unit 50 as shown below.
  • the purge stop button is pressed (ON state)
  • the control mode of the purge control valve 16 cannot be switched to the shutoff mode, and the normal mode is maintained, the purge process cannot be stopped.
  • a second color for example, green
  • 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 purge control valve 16 can close the instruction pressure supply pipe 21. ..
  • the control unit 60 gives an instruction pressure to the purge control valve 16.
  • the supply pipe 21 can be closed.
  • the purge stop button functions as an absolute purge stop button.
  • 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.
  • the control unit 60 measures the time from the time when the tank pressure drops to Pt2 to the time when the tank pressure reaches Pt1 next, 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 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 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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
  • the air supply speed of the compressor 11 from the time T11 to the time T13 one minute later is 100 L /
  • 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.
  • 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. ..
  • the control unit 60 measures the time from the time when the tank pressure drops to Pt2 to the time when the tank pressure reaches Pt1 next, and compares the measured time with the first threshold time.
  • the second threshold 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, 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.
  • 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.
  • 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.
  • control unit 60 when the control unit 60 satisfies the supply amount release condition (1) or the supply amount release condition (2), the control unit 60 normally sets the control mode of the purge control valve 16. Switching to mode. However, the control unit 60 can switch the control mode of the purge control valve 16 to the normal mode when any one of the number of times condition and the traveling condition shown below is satisfied.
  • the number of times condition is that the number of times counted from the indicated pressure stop time (hereinafter referred to as the number of times of counting) is equal to or greater than the threshold number of times.
  • the number of counts is the number of times the tank pressure drops from Pt1 to Pt2 after the indicated pressure stop time, or the number of times the tank pressure rises from Pt2 to Pt1 after the indicated pressure stop time.
  • the control unit 60 can switch the control mode of the purge control valve 16 to the normal mode when the number of counts from the indicated pressure stop time to the current time is equal to or greater than the threshold number. When the number of counts from the indicated pressure stop time to the current time is less than the threshold number, the control unit 60 can maintain the shutoff mode without switching the control mode of the purge control valve 16.
  • the number of counts is counted by the control unit 60, and the control unit 60 decreases the tank pressure after reaching a value of Pt1 or more and becomes 1 when the tank pressure becomes Pt2 or less at a time after the indicated pressure stop time. Count times. Then, when the tank pressure changes from a value of Pt2 or less to a value of Pt1 or more, and the tank pressure drops from a value of Pt1 or more to a value of Pt2 or less, the count is performed once more. Alternatively, the control unit 60 counts once when the tank pressure reaches a value of Pt2 or less and then increases and becomes Pt1 or more at a time after the indicated pressure stop time.
  • the control unit 60 counts once every time the instruction pressure supply pipe 21 should be closed.
  • control unit 60 determines whether or not the number of counts has reached the threshold number at the current time.
  • the threshold number is, for example, two times.
  • the threshold number When the number of counts reaches the threshold number, it means that the period during which the purge control valve 16 does not supply the indicated pressure to the purge valve 131 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 counts has not reached the threshold number, the period during which the purge control valve 16 does not supply the indicated pressure to the purge valve 131 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 when the control mode of the purge control valve 16 is switched to the shutoff mode because the intention condition is satisfied, and when the intention condition is not satisfied but other conditions are satisfied and the purge control is performed.
  • the values may be different from each other depending on whether the control mode of the valve 16 is switched to the shutoff mode.
  • the driving condition is that the door of the vehicle 100 is closed.
  • 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.
  • the control unit 60 determines that the door of the vehicle 100 is closed, the control unit 60 maintains the control of the purge control valve 16 in the shutoff mode for a certain period of time (for example, several seconds) from the time when the closing signal S4 is received, and keeps the control unit 60 constant.
  • control mode of the purge control valve 16 is switched to the normal mode, and when it is determined that the door of the vehicle 100 remains open, the control unit 60 switches the control mode of the purge control valve 16 to the normal mode. Can be maintained in cutoff mode.
  • the control mode of the purge control valve 16 is switched to the normal mode, so that the purge process is stopped after waiting for the vehicle 100 to travel. It can be released. 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.
  • 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.
  • the control unit 60 starts measuring the time from the indicated pressure stop time, and determines whether or not the current time has passed the first predetermined time from the indicated pressure stop 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, 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.
  • 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.
  • 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.
  • 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
  • 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.
  • 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.
  • 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.
  • the control unit 60 starts measuring the time from the indicated pressure stop time, and determines whether or not the current time has passed the second predetermined time from the indicated pressure stop time.
  • 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 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.
  • 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.
  • 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.
  • the control unit 60 tanks when at least one of the intention condition, the supply amount stop condition (1) and (2), the stop condition, and the purge time condition is satisfied.
  • the purge control valve 16 in the control mode (cutoff mode) in which the indicated pressure supply pipe 21 is closed regardless of the pressure, the indicated pressure is prevented from being supplied to the purge valve 131. Therefore, the frequency of the purging process (that is, the regeneration operation of the desiccant D) in the air dryer 13 can be reduced.
  • the purge system 1 of the present embodiment does not have a governor, the space occupied by the purge system 1 when the purge system 1 is mounted on the vehicle 100 can be reduced.
  • the purge system 1 of the present embodiment is provided with a pressure sensor 17 and a purge control valve 16 instead of being provided with a governor, and by controlling the purge control valve 16 in the normal mode, the air dryer 13 periodically performs the purge system 1.
  • the purge process can be performed.
  • control unit 60 can switch the control mode of the purge control valve 16 to the shutoff mode, 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.
  • the control unit 60 can switch the control mode of the purge control valve 16 to the shutoff mode, so that the water content and oil content of the desiccant D of the air dryer 13 can be switched.
  • the purging process can be stopped in consideration of the amount that can be absorbed. 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. Further, the load in each device of the vehicle 100 includes that the piping, the main tank 14, and the like are rusted, and that the purge control valve 16 and the like do not operate normally.
  • the control unit 60 can switch the control mode of the purge control valve 16 to the shutoff mode, 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.
  • control unit 60 can switch the control mode of the purge control valve 16 to the shutoff mode, and is based on whether or not the desiccant D has been sufficiently regenerated.
  • the purging process 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 switch the control mode of the purge control valve 16 to the shutoff mode 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.
  • the control unit 60 sets the control mode of the purge control valve 16 when any of the supply amount release condition (1), the supply amount release condition (2), and the number of times condition is satisfied. You can switch to normal mode. As a result, the indicated pressure supply pipe 21 is opened by the purge control valve 16 by the time when the tank pressure reaches Pt1 next time after the control mode is switched to the normal mode at the latest. 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.
  • FIG. 4A is a diagram showing a purge control valve 16 included in the purge system 1 according to the first modification, showing the purge system 1 in a state where the instruction pressure supply pipe 21 is open.
  • FIG. 4B is a diagram showing a purge control valve 16 included in the purge system 1 according to the first modification, showing the purge system 1 in a state where the instruction pressure supply pipe 21 is closed.
  • the purge control valve 16 is provided in a first valve 161 provided in the indicated pressure supply pipe 21 and a second valve provided in a pipe 22 (hereinafter, referred to as an air open pipe) that communicates the purge valve with the atmosphere. It may be composed of 162. When the second valve 162 opens the air opening pipe 22, 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 instruction pressure supply pipe 21 by the first valve at the timing of opening the instruction pressure supply pipe 21, and closes the atmosphere release pipe 22 by the second valve (see FIG. 4A). Further, the control unit 60 closes the instruction pressure supply pipe 21 by the first valve at the timing of closing the instruction pressure supply pipe 21, and opens the atmosphere release pipe 22 by the second valve (see FIG. 4B).
  • FIG. 5 is a diagram showing a main configuration of the purge system 1 according to the second modification.
  • the purge control valve 16 is arranged inside the air dryer 13.
  • the instruction pressure supply pipe 21 connects the pipe that supplies the air of the air dryer 13 to the main tank 14 (hereinafter, referred to as a tank upstream pipe) and the purge valve 131 via the purge control valve 16. That is, in the second modification, the indicated pressure is supplied to the purge valve 131 via the tank upstream pipe and the indicated pressure supply pipe 21.
  • the control content of the purge control valve 16 is the same as that of the above-described embodiment, and according to the purge system 1 according to the second modification, the same effect as that of the embodiment can be obtained. Further, the purge control valve 16 of the modification 2 may also be composed of a plurality of on-off valves as shown in the modification 1.
  • 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 may stop the air supply by the compressor 11 when the measured value D0 of the tank pressure by the pressure sensor 17 reaches a predetermined pressure value smaller than the limit value.
  • the control unit 60 switches the control mode of the purge control valve 16 from the normal mode to the shutoff mode, and the humidity inside the air dryer 13 becomes another predetermined humidity.
  • the control mode of the purge control valve 16 may be switched from the shutoff mode to the normal mode.
  • another predetermined humidity is larger than the predetermined humidity.
  • 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.
  • the purge system 1 of the present disclosure may have a configuration in which air is sent not only to the purge valve 131 but also to the compressor 11 by the operation of the purge control valve 16.
  • 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.
  • the 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.
  • the vehicle 100 may be, for example, an electric vehicle or an engine vehicle.
  • a purge system having a configuration in which the indicated pressure is supplied to the compressor 11 side can be mounted on an engine vehicle.
  • 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 Purge control valve 161 First valve 162 Second valve 17 Pressure sensor 21 Instructed pressure supply pipe 22 Air release pipe 41 Flow sensor 42 Open / close detection unit 43 Operation detection Part 50 Output part 60 Control part 100 Vehicle S3 Open signal S4 Close signal S5 Operation detection signal D0, D1 Measured value

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

Abstract

This purge system is provided with an air dryer that has a purge valve, a purge control valve that is controlled in either one of a first control mode in which supply of instruction pressure to the purge valve is started when tank pressure which is pressure inside a main tank reaches a first pressure value and is stopped when said tank pressure drops to a second pressure value less than the first pressure value and a second control mode in which said supply of the instruction pressure is stopped, and a control unit that performs switching from the first control mode to the second control mode when at least one of the following events occurs: a prescribed operation has been detected; an air supply amount during a prescribed period becomes smaller than a first threshold value; and the duration, from the time when supply of the instruction pressure is started to the time when the supply of the instruction pressure is stopped, becomes equal to or longer than a reference period.

Description

パージシステムおよび車両Purge system and vehicle
　本開示は、パージシステムおよび車両に関する。 This disclosure relates to purge systems and vehicles.
　エアブレーキ等のエア機器の動作に使用されるエアを供給するシステム（例えば、特許文献１）では、エアコンプレッサにより圧縮されたエアがエアドライヤに送られ、エアドライヤにおいて圧縮されたエア中の水分や油分が除去され、水分や油分が除去されたエアがタンクに貯留される。エアドライヤ内部には乾燥剤が設けられており、その乾燥剤がエアドライヤに流入してくるエア中の水分や油分を除去している。 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.
　特許文献１に開示されているエアドライヤはパージ弁を備えており、パージ弁に対してタンクからエアが供給されることでパージ弁が開放され、エアドライヤ内部が大気に開放される。これにより、エアドライヤ内部の乾燥された空気が大気に向けて移動する際に、エアドライヤ内の乾燥剤が吸収している水分や油分を奪い去ることで、乾燥剤が再生する。 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.
日本国特開平８－３０１１００号公報Japanese Patent Application Laid-Open No. 8-301100
　乾燥剤の再生動作が行われる際、エアドライヤの外部に汚れたエアが吐き出されるので地面や周囲の空気を汚染してしまう。例えば、エアを供給するシステムを備えるバスにおいて、該バスは、停留所等の決まった位置で停車するため、バスが停車している間に乾燥剤の再生処理が実行されると、再生処理時に吐き出された水分・油分で該決まった位置が汚染される。また、エアドライヤの外部にエアが吐き出される際に音が発生する。 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.
　特許文献１に開示されているシステムでは、タンクとパージ弁とを繋ぐ配管にはプレッシャガバナが設けられており、タンク内の圧力に応じて、プレッシャガバナがパージ弁に対するエアの供給およびエアの供給の停止を切り替えている。つまり、乾燥剤の再生動作の頻度は、プレッシャガバナの動作に依存していた。 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.
　本開示は、以上の点を考慮してなされたものであり、エアドライヤでの乾燥剤の再生動作の頻度を少なくするパージシステムおよびパージシステムを備える車両を提供することを目的とする。 The present disclosure has been made in consideration of the above points, and an object of the present disclosure is to provide a vehicle equipped with a purge system and a purge system that reduce the frequency of desiccant regeneration operations in an air dryer.
　本開示のパージシステムの一つの態様は、メインタンクと、エアを吐出するコンプレッサと、パージバルブを有しており、前記コンプレッサから吐出されたエアを前記メインタンクに供給するエアドライヤと、前記メインタンク内の圧力であるタンク圧が第１の圧力値に達したときに前記メインタンクから前記パージバルブへの指示圧の供給を開始し、前記タンク圧が前記第１の圧力値よりも小さい第２の圧力値に低下したときに前記指示圧の供給を停止する第１の制御モード、および、前記タンク圧に依らずに前記指示圧の供給を停止する第２の制御モードのいずれかの制御モードで制御されるパージ制御弁と、前記パージ制御弁を制御しており、所定の操作が検出されたこと、所定期間における前記コンプレッサによる前記エアドライヤへのエア供給量が第１の閾値よりも少ないと判定したこと、および、前記パージ制御弁が前記指示圧の供給を開始した時刻から前記パージ制御弁が前記指示圧の供給を停止した時刻までの時間が基準時間以上であることの少なくともいずれかが満たされた場合、前記パージ制御弁の制御モードを前記第１の制御モードから前記第２の制御モードに切り替える制御部と、を備える。 One aspect of the purge system of the present disclosure includes a main tank, a compressor for discharging air, a purge valve, an air dryer for supplying the air discharged from the compressor to the main tank, and the inside of the main tank. When the tank pressure, which is the pressure of, reaches the first pressure value, the supply of the indicated pressure from the main tank to the purge valve is started, and the tank pressure is smaller than the first pressure value. Controlled in one of a first control mode in which the supply of the indicated pressure is stopped when the value drops to a value and a second control mode in which the supply of the indicated pressure is stopped regardless of the tank pressure. It is determined that the purge control valve to be operated and the purge control valve are controlled, that a predetermined operation is detected, and that the amount of air supplied to the air dryer by the compressor during a predetermined period is less than the first threshold value. That, and at least one of the time from the time when the purge control valve starts supplying the indicated pressure to the time when the purge control valve stops supplying the indicated pressure is equal to or longer than the reference time is satisfied. In this case, a control unit for switching the control mode of the purge control valve from the first control mode to the second control mode is provided.
　本開示の車両の一つの態様は、上述のパージシステムを備える。 One aspect of the vehicle of the present disclosure comprises the purge system described above.
　本開示によれば、エアドライヤでの乾燥剤の再生動作の頻度を少なくするパージシステムおよびパージシステムを備える車両を提供することができる。 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.
図１は、実施形態に係る車両が備えるパージシステムの主要構成を示す図である。FIG. 1 is a diagram showing a main configuration of a purge system included in a vehicle according to an embodiment. 図２は、実施形態に係るパージシステムが実行するコンプレッサの駆動開始および駆動停止について説明する図である。FIG. 2 is a diagram illustrating drive start and drive stop of the compressor executed by the purge system according to the embodiment. 図３は、実施形態に係るパージシステムが実行するパージ制御弁の制御例を示すフローチャートである。FIG. 3 is a flowchart showing a control example of the purge control valve executed by the purge system according to the embodiment. 図４Ａは、変形例１に係るパージシステムが備えるパージ制御弁を示す図である。FIG. 4A is a diagram showing a purge control valve included in the purge system according to the first modification. 図４Ｂは、変形例１に係るパージシステムが備えるパージ制御弁を示す図である。FIG. 4B is a diagram showing a purge control valve included in the purge system according to the first modification. 図５は、変形例２に係るパージシステムの主要構成を示す図である。FIG. 5 is a diagram showing a main configuration of the purge system according to the second modification.
　以下、本開示の実施形態を、図面を参照して説明する。 Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
　＜構成＞
　図１は、本開示の実施形態に係る車両１００が備えるパージシステム１の主要構成を示す図である。以下、車両１００は、バスやトラック等の大型車両であるとして説明する。 <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.
　パージシステム１は、コンプレッサ１１、モータ１２、エアドライヤ１３、メインタンク１４、パージ制御弁１６、圧力センサ１７、流量センサ４１、開閉検出部４２、操作検出部４３、出力部５０、および、制御部６０を備えている。 The purge system 1 includes a compressor 11, a motor 12, an air dryer 13, a main tank 14, a purge control valve 16, a pressure sensor 17, a flow rate sensor 41, an open / close detection unit 42, an operation detection unit 43, an output unit 50, and a control unit 60. It has.
　コンプレッサ１１は、吸入したエアを所望の流量で吐出し、吐出したエアをエアドライヤ１３に供給する。コンプレッサ１１は、モータ１２により駆動される電動コンプレッサである。 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.
　モータ１２は、制御部６０の制御の下、所定の回転速度でコンプレッサ１１を駆動させる。 The motor 12 drives the compressor 11 at a predetermined rotation speed under the control of the control unit 60.
　エアドライヤ１３は、コンプレッサ１１から吐出されたエアに含まれる水分や油分を除去し、水分が除去されたエアをメインタンク１４に供給する。 The air dryer 13 removes water and oil contained in the air discharged from the compressor 11, and supplies the removed air to the main tank 14.
　エアドライヤ１３の内部には、乾燥剤Ｄが配置されている。乾燥剤Ｄは、エアドライヤ１３に流入してきたエア中の水分や油分を吸収する。 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.
　エアドライヤ１３は、パージバルブ１３１を備えており、パージバルブ１３１に指示圧が供給されたとき、乾燥剤Ｄの再生処理、いわゆる、パージ処理を実行する。ここで、指示圧は、エアドライヤ１３にパージ処理を実行させるためのトリガとなるエアであり、メインタンク１４から供給される。 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. 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.
　パージバルブ１３１に指示圧が供給されることでパージバルブ１３１が開放され、エアドライヤ１３内部が大気に開放される。そして、エアドライヤ１３内部の乾燥しているエアは、大気に排出される際に乾燥剤Ｄが吸収している水分や油分を奪い去る。これにより、乾燥剤Ｄが再生される。 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.
　メインタンク１４は、エアドライヤ１３によって水分や油分が除去されたエアを貯蔵する。メインタンク１４に貯蔵されたエアは、適宜のタイミングで、エアブレーキ、エアサスペンション、ドアの開閉に関連する機器、および、ニーリング動作に関連する機器等のエア機器（不図示）に供給される。 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.
　パージ制御弁１６は、電磁弁である。メインタンク１４とパージバルブ１３１を繋ぐ配管（以下、指示圧供給配管と称す。）２１に設けられている。パージ制御弁１６は、制御部６０の制御の下、指示圧供給配管２１の開放および閉塞を行うことで、メインタンク１４からパージバルブ１３１への指示圧の供給および指示圧の供給の停止を行う。なお、指示圧を供給するとは、メインタンク１４内のエアをパージバルブ１３１に供給することを意味する。指示圧は、パージ制御弁１６が指示圧供給配管２１を開放しているとき、パージバルブ１３１に供給され、パージ制御弁１６が指示圧供給配管２１を閉塞しているとき、パージバルブ１３１に供給されない。 The purge control valve 16 is a solenoid valve. It is provided in a pipe (hereinafter, referred to as an indicated pressure supply pipe) 21 connecting the main tank 14 and the purge valve 131. The purge control valve 16 opens and closes the instruction pressure supply pipe 21 under the control of the control unit 60 to supply the instruction pressure from the main tank 14 to the purge valve 131 and stop the supply of the instruction pressure. Note that supplying the indicated pressure means supplying the air in the main tank 14 to the purge valve 131. The indicated pressure is supplied to the purge valve 131 when the purge control valve 16 opens the indicated pressure supply pipe 21, and is not supplied to the purge valve 131 when the purge control valve 16 closes the indicated pressure supply pipe 21.
　なお、パージ制御弁１６は、方向弁であり、指示圧供給配管２１を閉塞するときは、パージバルブ１３１を大気に連通させている。 The purge control valve 16 is a directional valve, and when the indicated pressure supply pipe 21 is closed, the purge valve 131 communicates with the atmosphere.
　圧力センサ１７は、メインタンク１４に取り付けられている。圧力センサ１７は、メインタンク１４内部の圧力（以下、タンク圧と称す。）を測定し、その測定値Ｄ０を制御部６０に送信する。なお、圧力センサ１７は、エアドライヤ１３とメインタンク１４とを繋ぐ配管に設けられてもよい。また、圧力センサ１７は、指示圧供給配管２１におけるパージ制御弁１６よりも上流側に設けられてもよい。 The pressure sensor 17 is attached to the main tank 14. The pressure sensor 17 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 17 may be provided in a pipe connecting the air dryer 13 and the main tank 14. Further, the pressure sensor 17 may be provided on the upstream side of the purge control valve 16 in the indicated pressure supply pipe 21.
　流量センサ４１は、コンプレッサ１１とエアドライヤ１３とを繋ぐ配管に設けられている。流量センサ４１は、コンプレッサ１１とエアドライヤ１３とを繋ぐ配管におけるエアの通気量、つまり、コンプレッサ１１からエアドライヤ１３へのエアの流量を測定し、測定値Ｄ１を制御部６０に送信する。流量センサ４１は、例えば、コンプレッサ１１とエアドライヤ１３とを繋ぐ配管における瞬時流量を測定する瞬時流量センサ、または、当該配管における累積流量を測定する累積流量センサである。 The flow rate sensor 41 is provided in the 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.
　開閉検出部４２は、ドアスイッチである。開閉検出部４２は、車両１００のドア（不図示）を開く操作を検出した場合、ドアを開く操作が検出されたことを知らせる開信号Ｓ３を制御部６０に送信し、ドアを閉じる操作を検出した場合、ドアを閉じる操作が検出されたことを知らせる閉信号Ｓ４を制御部６０に送信する。 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. If so, a closing signal S4 notifying that the operation to close the door is detected is transmitted to the control unit 60.
　操作検出部４３は、車両１００の運転席付近に設けられているパージ停止ボタンを含む。操作検出部４３は、パージ停止を指示する操作を検出した場合、パージ停止を指示する操作を検出したことを知らせる操作検出信号Ｓ５を制御部６０に送信する。なお、本実施形態において、パージ停止を指示する操作は、パージ停止ボタンが押下されることである。パージ停止ボタンは、一度押下されると、押下された状態（つまり、ＯＮ状態）を維持する。そして、後述するパージキャンセルが解除されたときに自動で再度押下可能な状態（つまり、ＯＦＦ状態）となる。 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).
　出力部５０は、スピーカ、表示部、または、スピーカと表示部とを組み合わせた装置である。出力部５０は、車両１００の運転席近傍に設けられており、制御部６０による制御の下、パージ処理がキャンセル中であることおよびパージ処理のキャンセルが解除されたことを、音声、画面表示、または、音声と画面表示との組み合わせにより車両１００の乗員に通知する。 The output unit 50 is a speaker, a display unit, or a device that combines a speaker and a display unit. 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.
　なお、パージ処理のキャンセル中とは、制御部６０が、パージ制御弁１６を遮断モードにて制御していることに対応し、パージ処理のキャンセルの解除は、制御部６０が、パージ制御弁１６を遮断モードから通常モードに切り替えることに対応する。遮断モードおよび通常モードについては、後に詳細に説明する。 Note that canceling the purge process corresponds to the control unit 60 controlling the purge control valve 16 in the shutoff mode, and the control unit 60 cancels the cancellation of the purge process by the purge control valve 16. Corresponds to switching from cutoff mode to normal mode. The cutoff mode and the normal mode will be described in detail later.
　制御部６０は、パージシステム１の全般の制御を行う。より具体的には、制御部６０は、各種信号Ｓ３、Ｓ４、および、Ｓ５、並びに、測定値Ｄ０およびＤ１等に基づいて、パージ制御弁１６の開放および閉塞の制御、並びに、モータ１２の駆動制御（つまり、コンプレッサの駆動制御）を行っている。 The control unit 60 controls the entire purge system 1. More specifically, the control unit 60 controls the opening and closing of the purge control valve 16 and drives the motor 12 based on various signals S3, S4, S5, and the measured values D0 and D1. Control (that is, compressor drive control) is performed.
　なお、制御部６０は、例えば、ＣＰＵ（Central Processing Unit）、制御プログラムを格納したＲＯＭ（Read Only Memory）などの記憶媒体、およびＲＡＭ（Random Access Memory）などの作業用メモリを有し、ＣＰＵが制御プログラムを実行することにより、パージシステム１の動作を制御する。 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). The operation of the purge system 1 is controlled by executing the control program.
　＜パージ制御弁の制御＞
　制御部６０は、通常モードと遮断モードとのいずれかの制御モードでパージ制御弁１６を制御している。 <Control of purge control valve>
The control unit 60 controls the purge control valve 16 in either a normal mode or a shutoff mode.
　通常モードとは、タンク圧が圧力値Ｐｔ１に達したときに指示圧供給配管２１をパージ制御弁１６により開放させ、タンク圧が圧力値Ｐｔ２に低下したときに指示圧供給配管２１をパージ制御弁１６により閉塞させる制御モードである。指示圧供給配管２１をパージ制御弁１６により開放させることは、指示圧の供給を開始させることに対応し、指示圧供給配管２１をパージ制御弁１６により閉塞させることは、指示圧の供給を停止することに対応する。制御モードが通常モードであるとき、制御部６０は、圧力センサ１７の測定値Ｄ０に基づいてパージ制御弁１６を制御する。 In the normal mode, the indicated pressure supply pipe 21 is opened by the purge control valve 16 when the tank pressure reaches the pressure value Pt1, and the indicated pressure supply pipe 21 is purged when the tank pressure drops to the pressure value Pt2. This is a control mode in which the block is closed by 16. Opening the instruction pressure supply pipe 21 by the purge control valve 16 corresponds to starting the supply of the instruction pressure, and closing the instruction pressure supply pipe 21 by the purge control valve 16 stops the supply of the instruction pressure. Corresponds to doing. When the control mode is the normal mode, the control unit 60 controls the purge control valve 16 based on the measured value D0 of the pressure sensor 17.
　なお、圧力値Ｐｔ１は圧力値Ｐｔ２よりも大きく、例えば、圧力値Ｐｔ１は、９００ｋＰａであり、圧力値Ｐｔ２は、８００ｋＰａである。圧力値Ｐｔ１は、メインタンク１４からパージバルブ１３１に供給される圧力の値であり、それは、メインタンク１４におけるエアの充填率が１００％であるときのタンク圧の値になる。圧力値Ｐｔ２は、コンプレッサ１１がエアドライヤ１３にエアを供給する動作を実行する目安となる圧力値である。 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 the value of the pressure supplied from the main tank 14 to the purge valve 131, which is 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 air dryer 13 by the compressor 11.
　遮断モードとは、タンク圧に依らずに指示圧の供給を停止する制御モードである。制御モードが遮断モードであるとき、制御部６０は、パージ制御弁１６による指示圧供給配管２１の閉塞を維持する。 The cutoff mode is a control mode that stops the supply of the indicated pressure regardless of the tank pressure. When the control mode is the shutoff mode, the control unit 60 maintains the instruction pressure supply pipe 21 blocked by the purge control valve 16.
　＜コンプレッサの制御＞
　制御部６０は、圧力センサ１７の測定値Ｄ０が圧力値Ｐｔ１に達したと判定した場合、コンプレッサ１１の駆動を停止させる。また、制御部６０は、圧力センサ１７の測定値Ｄ０が圧力値Ｐｔ２に低下したと判定した場合、コンプレッサ１１の駆動を開始させる。なお、本実施形態では、制御部６０は、コンプレッサ１１を駆動させるとき、供給速度が一定値となるように駆動させる。 <Compressor control>
When the control unit 60 determines that the measured value D0 of the pressure sensor 17 has reached the pressure value Pt1, the drive of the compressor 11 is stopped. Further, when the control unit 60 determines that the measured value D0 of the pressure sensor 17 has dropped to the pressure value Pt2, the control unit 60 starts driving the compressor 11. 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.
　なお、制御部６０は、圧力センサ１７の測定値Ｄ０が圧力値Ｐｔ１に達したと判定した場合、コンプレッサ１１の駆動を停止させることに替えて、モータ１２を微小回転速度で回転させてもよい。この微小回転速度とは、コンプレッサ１１をエアドライヤ１３に向けてエアが供給されない程度に駆動させることができるモータ１２の回転速度である。つまり、制御部６０は、圧力センサ１７の測定値Ｄ０が圧力値Ｐｔ１に達したと判定した場合、コンプレッサ１１によるエアドライヤ１３に向けたエア供給を停止し、圧力センサ１７の測定値Ｄ０が圧力値Ｐｔ２に低下したと判定した場合、コンプレッサ１１によるエアドライヤ１３に向けたエア供給を開始してもよい。以下の説明では、制御部６０が、圧力センサ１７の測定値Ｄ０が圧力値Ｐｔ１に達したと判定した場合、コンプレッサ１１の駆動を停止させることとして説明する。 When the control unit 60 determines that the measured value D0 of the pressure sensor 17 has reached the pressure value Pt1, the motor 12 may be rotated at a minute rotational speed instead of stopping the driving 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 determines that the measured value D0 of the pressure sensor 17 has reached the pressure value Pt1, the air supply to the air dryer 13 by the compressor 11 is stopped, and the measured value D0 of the pressure sensor 17 is the pressure value. If it is determined that the pressure has dropped to Pt2, the air supply to the air dryer 13 by the compressor 11 may be started. In the following description, when the control unit 60 determines that the measured value D0 of the pressure sensor 17 has reached the pressure value Pt1, the drive of the compressor 11 will be stopped.
　以下、図２を用いて本実施形態の制御部６０によるコンプレッサ１１の駆動制御を説明する。 Hereinafter, the drive control of the compressor 11 by the control unit 60 of the present embodiment will be described with reference to FIG.
　図２は、実施形態に係るパージシステム１が実行するコンプレッサ１１の駆動開始および駆動停止について説明する図である。図２の上側のグラフには、タンク圧の時間変化が示されている。なお、図２の上側のグラフのＰ０は、大気圧を示す。図２の下側のグラフには、コンプレッサ１１の駆動状態（つまり、ＯＮ状態）と駆動停止状態（つまり、ＯＦＦ状態）とが切り替わるタイミングが時刻とともに示されている。なお、時刻Ｔ００において、コンプレッサ１１はＯＦＦ状態にあり、パージ制御弁１６は、指示圧の供給を行っている状態にある。 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. The upper graph of FIG. 2 shows the time change of the tank 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 purge control valve 16 is in the state of supplying the indicated pressure.
　車両１００の各エア機器によるメインタンク１４内のエアの使用により、タンク圧が下降していき、時刻Ｔ０１に、タンク圧がＰｔ２に低下すると、制御部６０は、圧力センサ１７の測定値Ｄ０がＰｔ２に低下したと判定する。そして、制御部６０は、時刻Ｔ０１において、コンプレッサ１１の駆動を開始させるとともに、パージ制御弁１６により指示圧供給配管２１を閉塞させる。指示圧供給配管２１が閉塞されることで、パージバルブ１３１への指示圧の供給が停止する。 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 determines the measured value D0 of the pressure sensor 17. It is determined that the pressure has decreased to Pt2. Then, at time T01, the control unit 60 starts driving the compressor 11 and closes the instruction pressure supply pipe 21 by the purge control valve 16. When the indicated pressure supply pipe 21 is closed, the supply of the indicated pressure to the purge valve 131 is stopped.
　コンプレッサ１１の駆動が開始されることで、メインタンク１４にエアが供給されるようになり、タンク圧が上昇していく。 When the compressor 11 is started to be driven, air is supplied to the main tank 14, and the tank pressure rises.
　そして、時刻Ｔ０２に、タンク圧がＰｔ１に達すると、制御部６０は、圧力センサ１７の測定値Ｄ０がＰｔ１に達したと判定する。そして、制御部６０は、時刻Ｔ０２において、コンプレッサ１１の駆動を停止させるとともに、パージ制御弁１６により指示圧供給配管２１を開放させる。指示圧供給配管２１が開放されることで、パージバルブ１３１への指示圧の供給が開始される。 Then, when the tank pressure reaches Pt1 at time T02, the control unit 60 determines that the measured value D0 of the pressure sensor 17 has reached Pt1. Then, at time T02, the control unit 60 stops the drive of the compressor 11 and opens the instruction pressure supply pipe 21 by the purge control valve 16. When the indicated pressure supply pipe 21 is opened, supply of the indicated pressure to the purge valve 131 is started.
　コンプレッサ１１の駆動が停止すると、車両１００の各エア機器によるメインタンク１４内のエアの使用により、タンク圧が下降していく。 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.
　時刻Ｔ０３に、タンク圧がＰｔ２に低下すると、制御部６０は、圧力センサ１７の測定値Ｄ０がＰｔ２に低下したと判定する。そして、制御部６０は、時刻Ｔ０３において、コンプレッサ１１の駆動を開始させるとともに、パージ制御弁１６により指示圧供給配管２１を閉塞させる。指示圧供給配管２１が閉塞されることで、パージバルブ１３１への指示圧の供給が停止する。 When the tank pressure drops to Pt2 at time T03, the control unit 60 determines that the measured value D0 of the pressure sensor 17 has dropped to Pt2. Then, at time T03, the control unit 60 starts driving the compressor 11 and closes the instruction pressure supply pipe 21 by the purge control valve 16. When the indicated pressure supply pipe 21 is closed, the supply of the indicated pressure to the purge valve 131 is stopped.
　コンプレッサ１１の駆動が開始されることで、メインタンク１４にエアが供給されるようになり、タンク圧が上昇していく。 When the compressor 11 is started to be driven, air is supplied to the main tank 14, and the tank pressure rises.
　そして、時刻Ｔ０４に、タンク圧がＰｔ１に達すると、制御部６０は、圧力センサ１７の測定値Ｄ０がＰｔ１に達したと判定する。そして、制御部６０は、時刻Ｔ０４において、コンプレッサ１１の駆動を停止させるとともに、パージ制御弁１６により指示圧供給配管２１を開放させる。指示圧供給配管２１が開放されることで、パージバルブ１３１への指示圧の供給が開始される。 Then, when the tank pressure reaches Pt1 at time T04, the control unit 60 determines that the measured value D0 of the pressure sensor 17 has reached Pt1. Then, at time T04, the control unit 60 stops the drive of the compressor 11 and opens the instruction pressure supply pipe 21 by the purge control valve 16. When the indicated pressure supply pipe 21 is opened, supply of the indicated pressure to the purge valve 131 is started.
　時刻Ｔ０４以降は、同様の動作が繰り返される。 After time T04, the same operation is repeated.
　このように、通常モードにおいて、パージ制御弁１６は、タンク圧の変化に応じて、指示圧の供給および指示圧の供給停止を行っている。なお、パージ制御弁１６の動作に注目したとき、パージ制御弁１６が指示圧の供給を開始した時刻から再びパージ制御弁１６が指示圧の供給を開始する時刻まで、または、パージ制御弁１６が指示圧の供給を停止した時刻から再びパージ制御弁１６が指示圧の供給を停止する時刻までが１サイクルである。例えば、図２において、時刻Ｔ０２から時刻Ｔ０４までが１サイクルに相当する。 As described above, in the normal mode, the purge control valve 16 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 purge control valve 16, the purge control valve 16 starts supplying the indicated pressure from the time when the purge control valve 16 starts supplying the indicated pressure to the time when the purge control valve 16 starts supplying the indicated pressure again, or the purge control valve 16 starts supplying the indicated pressure. One cycle is from the time when the supply of the indicated pressure is stopped to the time when the purge control valve 16 stops supplying the indicated pressure again. For example, in FIG. 2, the time from time T02 to time T04 corresponds to one cycle.
　＜パージ制御弁の制御モードの切り替え＞
　図３は、実施形態に係るパージシステム１が実行するパージ制御弁１６の制御例を示すフローチャートである。なお、図３に示されている処理が開始される前は、制御部６０は、パージ制御弁１６を通常モードで制御している。 <Switching the control mode of the purge control valve>
FIG. 3 is a flowchart showing a control example of the purge control 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 purge control valve 16 in the normal mode.
　制御部６０は、パージ停止ボタンが押下されたか否かを判定する（ステップＳ１２）。制御部６０は、操作検出部４３から操作検出信号Ｓ５を受信した場合、パージ停止ボタンが押下されたと判定し、操作検出部４３から操作検出信号Ｓ５を受信していない場合、パージ停止ボタンが押下されていないと判定する。以下の説明では、操作検出部４３のパージ停止ボタンが押下されることを意思条件と称することもある。 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.
　パージ停止ボタンが押下されたと判定された場合（ステップＳ１２のＹＥＳ）、制御部６０は、コンプレッサ１１によるエア供給が開始されてからコンプレッサ１１によるエアドライヤ１３へのエア供給が停止されるまでの間（以下、所定期間と称す。）のエア供給量が第１流量閾値よりも少ないか否かを判定する（ステップＳ１３）。 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).
　本実施形態において、所定期間は、タンク圧がＰｔ２に低下した時刻から次にタンク圧がＰｔ１に達した時刻までの期間に対応しており、例えば、図２における、時刻Ｔ０１から時刻Ｔ０２までの期間、時刻Ｔ０３から時刻Ｔ０４までの期間のことである。また、所定期間は、コンプレッサ１１によるエアドライヤ１３へのエア供給が開始されてからコンプレッサ１１によるエア供給が停止されるまでの時間（つまり、駆動時間）に対応する。 In the present embodiment, the predetermined period corresponds to the period from the time when the tank pressure drops to Pt2 to the time when the tank pressure reaches Pt1 next, for example, from time T01 to time T02 in FIG. The period is the period from time T03 to time T04. Further, the predetermined period corresponds to the time (that is, the driving 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.
　実際には、制御部６０は、所定期間における流量センサ４１による測定値Ｄ１を取得し、取得した測定値Ｄ１に基づいて、所定期間におけるコンプレッサ１１とエアドライヤ１３とを繋ぐ配管の累積通気量を算出し、算出した累積通気量と第１流量閾値とを比較している。ここで、所定期間における累積通気量は、所定期間におけるエア供給量に対応する。以下、コンプレッサ１１とエアドライヤ１３とを繋ぐ配管の累積通気量を単に累積通気量と称す。 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.
　第１流量閾値は、乾燥剤Ｄを通過するエアの許容量に基づいて決定される。例えば、乾燥剤Ｄのエアの許容量が、３００Ｌである場合、３００Ｌの６０％である１８０Ｌが第１流量閾値に決定されてもよい。なお、乾燥剤Ｄを通過するエアの許容量は、乾燥剤Ｄが吸収可能な水分および油分の量に基づいて決定されている。 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.
　所定期間中のエア供給量が第１流量閾値よりも少ない場合、車両１００の各種エア機器によるメインタンク１４内のエアの使用量が比較的少なかったことが想定される。所定期間中のエア供給量が第１流量閾値以上である場合、車両１００の各種エア機器によるメインタンク１４内のエアの使用量が比較的多かったことが想定される。以下の説明では、所定期間のエア供給量が第１流量閾値よりも少ないことを供給量停止条件（１）と称す。 When the amount of air supplied during the predetermined period is less 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).
　所定期間のエア供給量が第１流量閾値以上である場合（ステップＳ１３のＮＯ）、制御部６０は、パージ制御弁１６の制御モードを通常モードに維持し（ステップＳ１４）、ステップＳ１２に進む。 When the air supply amount 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 control mode of the purge control valve 16 in the normal mode (step S14), and proceeds to step S12.
　所定期間のエア供給量が第１流量閾値よりも少ない場合（ステップＳ１３のＹＥＳ）、制御部６０は、パージ制御弁１６の制御モードを通常モードから遮断モードに切り替える（ステップＳ１５）。これにより、パージ制御弁１６により指示圧供給配管２１が閉塞されるので、パージバルブ１３１に指示圧が供給されなくなり、エアドライヤ１３においてパージ処理が実行されなくなる。 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 switches the control mode of the purge control valve 16 from the normal mode to the shutoff mode (step S15). As a result, the instruction pressure supply pipe 21 is closed by the purge control valve 16, so that the instruction pressure is not supplied to the purge valve 131, and the purge process is not executed in the air dryer 13.
　次に、制御部６０は、パージバルブ１３１にメインタンク１４からの指示圧が供給されなくなった時刻（以下、指示圧停止時刻と称す。）からのコンプレッサ１１によるエアドライヤ１３へのエア供給量が、第２流量閾値に達したか否かを判定する（ステップＳ１６）。 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).
　まず、指示圧停止時刻について説明する。指示圧停止時刻は、パージ制御弁１６が指示圧供給配管２１を閉塞した直近の時刻である。パージ制御弁１６が指示圧供給配管２１を開放している間に制御モードが遮断モードに切り替えられた場合、遮断モードに切り替えられた時刻が指示圧停止時刻となる。パージ制御弁１６が指示圧供給配管２１を閉塞している間に制御モードが遮断モードに切り替えられた場合、通常モードにおいてパージ制御弁１６が指示圧供給配管２１を閉塞した直近の時刻、つまり、タンク圧がＰｔ２以下に低下した直近の時刻が指示圧停止時刻となる。 First, the indicated pressure stop time will be explained. The indicated pressure stop time is the most recent time when the purge control valve 16 closes the indicated pressure supply pipe 21. When the control mode is switched to the cutoff mode while the purge control valve 16 is opening the indicated pressure supply pipe 21, the time when the cutoff mode is switched becomes the indicated pressure stop time. When the control mode is switched to the shutoff mode while the purge control valve 16 closes the indicated pressure supply pipe 21, the most recent time when the purge control valve 16 closes the indicated pressure supply pipe 21 in the normal mode, that is, The most recent time when the tank pressure drops below Pt2 is the indicated pressure stop time.
　例えば、図２の時刻Ｔ０２以降、かつ、時刻Ｔ０３の直前までの期間にパージ制御弁１６の制御モードが遮断モードに切り替えられた場合、指示圧停止時刻は、遮断モードに切り替えられた時刻である。図２の時刻Ｔ０３以降、かつ、時刻Ｔ０４の直前までの期間にパージ制御弁１６の制御モードが遮断モードに切り替えられた場合、指示圧停止時刻は、タンク圧がＰｔ２以下に低下した直近の時刻、つまり、時刻Ｔ０３である。 For example, when the control mode of the purge control valve 16 is switched to the shutoff mode after the time T02 in FIG. 2 and before the time T03, the indicated pressure stop time is the time when the shutoff mode is switched. .. When the control mode of the purge control valve 16 is switched to the shutoff mode after the time T03 in FIG. 2 and immediately before the time T04, the indicated pressure stop time is the latest time when the tank pressure drops to Pt2 or less. That is, it is time T03.
　制御部６０は、指示圧停止時刻から現在時刻までの流量センサ４１による測定値Ｄ１を取得し、取得した測定値Ｄ１に基づいて、指示圧停止時刻から現在時刻までのコンプレッサ１１とエアドライヤ１３とを繋ぐ配管の累積通気量を算出し、算出した累積通気量と第２流量閾値とを比較している。以下の説明では、指示圧停止時刻からのコンプレッサ１１によるエアドライヤ１３へのエア供給量が、第２流量閾値に達することを供給量解除条件（１）と称することもある。 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).
　第２流量閾値は、乾燥剤Ｄを通過するエアの許容量に基づいて決定される。例えば、乾燥剤Ｄのエアの許容量が、３００Ｌである場合、３００Ｌの１３０％である３９０Ｌが第２流量閾値に決定されてもよい。第２流量閾値は、第１流量閾値以上の値であればよい。 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.
　指示圧停止時刻から現在時刻までのエア供給量が第２流量閾値に達している場合、乾燥剤Ｄが追加で吸収可能な水分や油分の量がごくわずかとなっていることを意味する。他方、指示圧停止時刻から現在時刻までのエア供給量が第２流量閾値に達していない場合、乾燥剤Ｄが追加で吸収可能な水分および油分の量に比較的余裕があることを意味する。 When the air supply amount from the indicated pressure stop time to the current time 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. 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.
　指示圧停止時刻からのコンプレッサ１１によるエアドライヤ１３へのエア供給量が、第２流量閾値に達していない場合（ステップＳ１６のＮＯ）、制御部６０は、当該エア供給量が、第２流量閾値に達するまでステップＳ１６の処理を繰り返す。 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.
　指示圧停止時刻からのコンプレッサ１１によるエアドライヤ１３へのエア供給量が、第２流量閾値に達した場合（ステップＳ１６のＹＥＳ）、制御部６０は、パージ制御弁１６の制御モードを遮断モードから通常モードに切り替える（ステップＳ１７）。 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 normally changes the control mode of the purge control valve 16 from the shutoff mode. Switch to the mode (step S17).
　パージ制御弁１６の制御モードが遮断モードから通常モードに切り替えられた時刻（以下、解除時刻と称す。）が、タンク圧がＰｔ１に達した時刻から、当該時刻の直後、かつ、タンク圧がＰｔ２に低下する直前の時刻までの期間に含まれる場合、制御部６０は、制御モードを通常モードに切り替えるとともに、パージ制御弁１６に指示圧供給配管２１を開放させる。 The time when the control mode of the purge control valve 16 is switched from the shutoff mode to the normal mode (hereinafter referred to as the release time) is immediately after the time when the tank pressure reaches Pt1 and the tank pressure is Pt2. When it is included in the period up to the time immediately before the decrease to, the control unit 60 switches the control mode to the normal mode and causes the purge control valve 16 to open the instruction pressure supply pipe 21.
　一方、解除時刻が、タンク圧がＰｔ２に低下した時刻から、当該時刻の直後、かつ、タンク圧がＰｔ１に達する直前の時刻までの期間に含まれる場合、制御部６０は、制御モードを通常モードに切り替えた後、タンク圧がＰｔ１に達してからパージ制御弁１６により指示圧供給配管２１を開放させる。 On the other hand, when the release time is included in the period from the time when the tank pressure drops to Pt2 to the time immediately after the time and immediately before the tank pressure reaches Pt1, the control unit 60 sets the control mode to the normal mode. After the tank pressure reaches Pt1, the indicated pressure supply pipe 21 is opened by the purge control valve 16.
　制御部６０は、解除時刻に関わらず、パージ制御弁１６の制御モードを遮断モードから通常モードに切り替えるとともに、パージ制御弁１６により指示圧供給配管２１を開放させてもよい。 The control unit 60 may switch the control mode of the purge control valve 16 from the shutoff mode to the normal mode and open the instruction pressure supply pipe 21 by the purge control valve 16 regardless of the release time.
　これにより、パージ制御弁１６によって指示圧供給配管２１が閉塞されるようになるので、パージバルブ１３１に指示圧が供給されなくなり、エアドライヤ１３においてパージ処理が実行されなくなる。その後、制御部６０は、ステップＳ１２の処理を実行する。 As a result, the indicated pressure supply pipe 21 is blocked by the purge control valve 16, so that the indicated pressure is not supplied to the purge valve 131, and the purge process is not executed in the air dryer 13. After that, the control unit 60 executes the process of step S12.
　パージ停止ボタンが押下されていないと判定された場合（ステップＳ１２のＮＯ）、制御部６０は、車両１００のドアが開かれているか否かを判定する（ステップＳ１８）。制御部６０は、閉信号Ｓ４を受信した直近の時刻以降に開閉検出部４２から開信号Ｓ３を受信した場合、車両１００のドアが開かれる操作が行われたと判定し、閉信号Ｓ４を受信した直近の時刻以降に開信号Ｓ３を受信していない場合、車両１００のドアが閉じられたままであると判定する。車両１００のドアが開かれているときには、車両１００が停止していることが想定される。以下の説明では、車両１００のドアが開かれていることを停車条件と称することもある。なお、パージ停止ボタンが押下される操作、および、ドアが開かれる操作は、パージ処理を停止させるための所定の操作であるといえる。 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.
　車両１００のドアが開かれていないと判定された場合（ステップＳ１８のＮＯ）、制御部６０は、直近のパージ時間が基準時間以上であるか否かを判定する（ステップＳ１９）。パージ時間とは、パージ制御弁１６がパージバルブ１３１に指示圧の供給を開始した時刻（つまり、タンク圧がＰｔ１に達した時刻）からその指示圧の供給を停止した時刻（つまり、タンク圧がＰｔ２以下に低下した時刻）の直前までの時間である。例えば、パージ時間は、図２における、時刻Ｔ０２から時刻Ｔ０３の直前までの時間である。なお、パージ時間は、制御部６０によって測定されている。以下の説明では、直近のパージ時間が基準時間以上であることをパージ時間条件と称する。 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 when the purge control valve 16 starts supplying the indicated pressure to the purge valve 131 (that is, the time when the tank pressure reaches Pt1) and the time when the supply of the indicated pressure is stopped (that is, the tank pressure is Pt2). It is the time until just before (the time when it decreased below). 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 is referred to as a purge time condition.
　基準時間は、１サイクル当たりのパージ処理の実行時間の目安に基づいて決定される。例えば、パージ処理の実行時間の目安が、６０秒である場合、基準時間は、６０秒に決定されてもよいし、目安の１５０％の値である、９０秒に決定されてもよい。 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 90 seconds, which is a value of 150% of the guideline.
　直近のパージ時間が基準時間以上である場合、乾燥剤Ｄ中の水分や油分が十分に除去されたことが想定される。一方、パージ時間が基準時間未満である場合、乾燥剤Ｄの水分や油分が十分に除去されていない状況で、タンク圧がＰｔ２以下に低下し、パージ処理が終了したことが想定される。 If 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. On the other hand, when the purging time is less than the reference time, it is assumed that the tank pressure drops to Pt2 or less and the purging process is completed in a situation where the water and oil content of the desiccant D is not sufficiently removed.
　パージ時間が基準時間未満である場合（ステップＳ１９のＮＯ）、制御部６０は、パージ制御弁１６の制御モードを通常モードに維持し（ステップＳ１４）、ステップＳ１２に進む。 When the purge time is less than the reference time (NO in step S19), the control unit 60 maintains the control mode of the purge control valve 16 in the normal mode (step S14), and proceeds to step S12.
　パージ時間が基準時間以上である場合（ステップＳ１９のＹＥＳ）、制御部６０は、上述した所定期間のエア供給量が第３流量閾値よりも少ないか否かを判定する（ステップＳ２０）。 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 amount of air supplied during the predetermined period described above is less than the third flow rate threshold value (step S20).
　ここで、制御部６０は、所定期間における流量センサ４１による測定値Ｄ１を取得し、取得した測定値Ｄ１に基づいて、所定期間におけるコンプレッサ１１とエアドライヤ１３とを繋ぐ配管の累積通気量を算出し、算出した累積通気量と第３流量閾値とを比較している。以下の説明では、所定期間のエア供給量が第３流量閾値よりも少ないことを供給量停止条件（２）と称することもある。 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).
　第３流量閾値は、乾燥剤Ｄを通過するエアの許容量に基づいて決定される。例えば、乾燥剤Ｄのエアの許容量が、３００Ｌである場合、３００Ｌの３０％である９０Ｌが第３流量閾値に決定されてもよい。なお、第３流量閾値は、第１流量閾値以下の値であればよい。第３流量閾値は、第１流量閾値と同じ値であってもよく、その場合、供給量停止条件（１）および（２）は互いに同一となる。 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.
　所定期間のエア供給量が第３流量閾値以上である場合（ステップＳ２０のＮＯ）、制御部６０は、パージ制御弁１６の制御モードを通常モードに維持し（ステップＳ１４）、ステップＳ１２に進む。 When the air supply amount 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 control mode of the purge control valve 16 in the normal mode (step S14), and proceeds to step S12.
　所定期間のエア供給量が第３流量閾値よりも少ない場合（ステップＳ２０のＹＥＳ）、制御部６０は、パージ制御弁１６の制御モードを通常モードから遮断モードに切り替える（ステップＳ２１）。これにより、パージ制御弁１６により指示圧供給配管２１が閉塞されるので、パージバルブ１３１に指示圧が供給されなくなり、エアドライヤ１３においてパージ処理が実行されなくなる。 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 switches the control mode of the purge control valve 16 from the normal mode to the shutoff mode (step S21). As a result, the instruction pressure supply pipe 21 is closed by the purge control valve 16, so that the instruction pressure is not supplied to the purge valve 131, and the purge process is not executed in the air dryer 13.
　次に、制御部６０は、指示圧停止時刻からのコンプレッサ１１によるエアドライヤ１３へのエア供給量が、第４流量閾値に達したか否かを判定する（ステップＳ２２）。 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).
　制御部６０は、指示圧停止時刻から現在時刻までの流量センサ４１による測定値Ｄ１を取得し、取得した測定値Ｄ１に基づいて、指示圧停止時刻から現在時刻までのコンプレッサ１１とエアドライヤ１３とを繋ぐ配管の累積通気量を算出し、算出した累積通気量と第４流量閾値とを比較している。以下の説明では、指示圧停止時刻からのコンプレッサ１１によるエアドライヤ１３へのエア供給量が、第４流量閾値に達することを供給量解除条件（２）と称することもある。 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).
　第４流量閾値は、乾燥剤Ｄを通過するエアの許容量に基づいて決定される。第４流量閾値は、第３流量閾値以上の値であればよい。本実施形態では、第４流量閾値は、第３流量閾値と同じ値であるとする。また、第４流量閾値は、第２流量閾値以下の値であればよい。なお、第４流量閾値は、第２流量閾値と同じ値であってもよく、この場合、供給量解除条件（１）および（２）は互いに同一となる。 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.
　指示圧停止時刻から現在時刻までのエア供給量が第４流量閾値に達している場合、乾燥剤Ｄが追加で吸収可能な水分や油分の量が少なくなっていることを意味する。他方、指示圧停止時刻から現在時刻までのエア供給量が第４流量閾値に達していない場合、乾燥剤Ｄが追加で吸収可能な水分および油分の量に余裕があることを意味する。 When the air supply amount from the indicated pressure stop time to the current time reaches the fourth flow rate threshold value, it means that the amount of water and 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.
　指示圧停止時刻からのコンプレッサ１１によるエアドライヤ１３へのエア供給量が、第４流量閾値に達していない場合（ステップＳ２２のＮＯ）、制御部６０は、当該エア供給量が、第４流量閾値に達するまでステップＳ２２の処理を繰り返す。 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.
　指示圧停止時刻からのコンプレッサ１１によるエアドライヤ１３へのエア供給量が、第４流量閾値に達した場合（ステップＳ２２のＹＥＳ）、制御部６０は、パージ制御弁１６の制御モードを遮断モードから通常モードに切り替える（ステップＳ２３）。これにより、パージ制御弁１６によって指示圧供給配管２１が閉塞されるようになるので、パージバルブ１３１に指示圧が供給されなくなり、エアドライヤ１３においてパージ処理が実行されなくなる。その後、制御部６０は、ステップＳ１２の処理を実行する。 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 normally changes the control mode of the purge control valve 16 from the shutoff mode. Switch to the mode (step S23). As a result, the instruction pressure supply pipe 21 is closed by the purge control valve 16, so that the instruction pressure is not supplied to the purge valve 131, and the purge process is not executed in the air dryer 13. After that, the control unit 60 executes the process of step S12.
　車両１００のドアが開かれていると判定された場合（ステップＳ１８のＹＥＳ）、制御部６０は、パージ制御弁１６の制御モードを通常モードから遮断モードに切り替える（ステップＳ２１）。これにより、パージ制御弁１６により指示圧供給配管２１が閉塞されるので、パージバルブ１３１に指示圧が供給されなくなり、エアドライヤ１３においてパージ処理が実行されなくなる。続いて、制御部６０は、ステップＳ２２の処理に移る。 When it is determined that the door of the vehicle 100 is open (YES in step S18), the control unit 60 switches the control mode of the purge control valve 16 from the normal mode to the shutoff mode (step S21). As a result, the instruction pressure supply pipe 21 is closed by the purge control valve 16, so that the instruction 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 S22.
　＜通知＞
　制御部６０は、パージ制御弁１６の制御モードを通常モードから遮断モードに切り替える（ステップＳ１５およびＳ２１）とともに、出力部５０を通じてパージ処理がキャンセル中であることを車両１００の乗員に通知する。 <Notification>
The control unit 60 switches the control mode of the purge control valve 16 from the normal mode to the shutoff mode (steps S15 and S21), and notifies the occupant of the vehicle 100 that the purge process is being canceled through the output unit 50.
　このとき、制御部６０は、出力部５０を通じてパージ処理がキャンセル中である旨をアナウンスしてもよいし、パージ処理がキャンセル中である旨を文字表示する画面を表示させてもよいし、アナウンスと画面表示とを併用して通知してもよい。 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.
　同様に、制御部６０は、パージ制御弁１６の制御モードを遮断モードから通常モードに切り替える（ステップＳ１７およびＳ２３）とともに、出力部５０を通じてパージキャンセルが解除されたことを車両１００の乗員に通知する。このとき、制御部６０は、出力部５０を通じてパージキャンセルが解除された旨をアナウンスしてもよいし、パージキャンセルが解除された旨を文字表示する画面を表示させてもよいし、アナウンスと画面表示とを併用して通知してもよい。 Similarly, the control unit 60 switches the control mode of the purge control valve 16 from the shutoff mode to the normal mode (steps S17 and S23), and notifies the occupants 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.
　また、制御部６０は、出力部５０を通じて以下に示すようにパージキャンセルに関する通知を行ってもよい。（１）パージ停止ボタンが押下されていない状態（ＯＦＦ状態）にあるとき、出力部５０を通じてパージ処理に関する情報を示さない。（２）パージ停止ボタンが押下された状態（ＯＮ状態）にあり、かつ、パージ制御弁１６の制御モードが遮断モードであるとき、パージ処理が停止されている旨を第１の色（例えば、橙色）で示す画面を出力部５０に表示させる。（３）パージ停止ボタンが押下された状態（ＯＮ状態）にあり、かつ、パージ制御弁１６の制御モードが遮断モードに切り替えられず、通常モードが維持されているとき、パージ処理が停止できない旨を第１の色とは異なる第２の色（例えば、緑色）で示す画面を出力部５０に表示させる。制御部６０が、出力部５０を通じて、（３）に示す通知を行うことで、車両１００の乗員は、パージシステム１が、パージ停止ボタンが押下されたにもかかわらずパージ処理がキャンセルされていない状況にあることを知ることができる。 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) When the purge stop button is pressed (ON state) and the control mode of the purge control valve 16 is the shutoff mode, the first color (for example, the purging process is stopped) indicates that the purge process is stopped. The screen indicated by (orange) is displayed on the output unit 50. (3) When the purge stop button is pressed (ON state), the control mode of the purge control valve 16 cannot be switched to the shutoff mode, and the normal mode is maintained, the purge process cannot be stopped. Is displayed on the output unit 50 by displaying a screen in a second color (for example, green) different from the first color. 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.
　＜他の制御＞
　図３のフローチャートが示す制御は、制御部６０は、意思条件を満たしていない場合に、停車条件の判定を行う制御である。しかしながら、制御部６０は、意思条件を満たすか否かにかかわらず、停車条件を判定し、停車条件が満たされた場合には、パージ制御弁１６に指示圧供給配管２１を閉塞させることができる。 <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 purge control valve 16 can close the instruction pressure supply pipe 21. ..
　また、制御部６０は、意思条件、供給量停止条件（１）、供給量停止条件（２）、および、パージ時間条件の少なくとも一つが満たされたと判定された場合、パージ制御弁１６に指示圧供給配管２１を閉塞させることができる。 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 gives an instruction pressure to the purge control valve 16. The supply pipe 21 can be closed.
　意思条件が満たされたとき、つまり、パージ停止ボタンが押下されたときに、制御部６０が、パージ制御弁１６の制御モードを遮断モードに切り替える場合、乗員の意思が優先されることになるので、パージ停止ボタンは、絶対パージ停止ボタンとして機能する。 When the intention condition is satisfied, that is, when the purge stop button is pressed, when the control unit 60 switches the control mode of the purge control valve 16 to the shutoff mode, the intention of the occupant is prioritized. , The purge stop button functions as an absolute purge stop button.
　また、制御部６０は、流量センサ４１による測定値Ｄ１に基づいてエア供給量を算出すること以外の手法で、供給量停止条件（１）が満たされたか否かを判定することができる。 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.
　（供給量停止条件（１）：時間計測）
　制御部６０は、コンプレッサ１１によるエアドライヤ１３へのエア供給が開始されてからコンプレッサ１１によるエア供給が停止されるまでの時間、つまり、駆動時間が第１閾値時間よりも短い場合、制御部６０は、供給量停止条件（１）を満たしたと判定できる。 (Supply stop condition (1): time measurement)
When the time from when the air supply to the air dryer 13 by the compressor 11 is started until when the air supply by the compressor 11 is stopped, that is, when the drive time is shorter than the first threshold time, the control unit 60 causes the control unit 60 to , It can be determined that the supply amount stop condition (1) is satisfied.
　制御部６０は、タンク圧がＰｔ２に低下した時刻から次にタンク圧がＰｔ１に達した時刻までの時間を計測し、計測した時間と第１閾値時間とを比較する。 The control unit 60 measures the time from the time when the tank pressure drops to Pt2 to the time when the tank pressure reaches Pt1 next, and compares the measured time with the first threshold time.
　第１閾値時間は、乾燥剤Ｄを通過するエアの許容量およびコンプレッサ１１のエア供給速度に基づいて決定される。例えば、乾燥剤Ｄのエアの許容量が３００Ｌであり、コンプレッサ１１のエア供給速度が１５０Ｌ／分である場合、１分１２秒が第１閾値時間に決定されてもよい。なお、１分１２秒は、コンプレッサ１１から１８０Ｌのエアがエアドライヤ１３に供給されるのに要する時間である。 The first threshold 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 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.
　駆動時間が第１閾値時間よりも短い場合、車両１００の各種エア機器によるメインタンク１４内のエアの使用量が比較的少なかったことが想定される。駆動時間中のエア供給量が第１閾値時間以上である場合、車両１００の各種エア機器によるメインタンク１４内のエアの使用量が比較的多かったことが想定される。 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.
　すなわち、第１閾値時間に基づくエア供給量が、第１流量閾値と一致するように第１閾値時間を決定することで、所定期間におけるコンプレッサ１１からエアドライヤ１３へのエア供給量が、第１流量閾値よりも少ないか否か、つまり、供給量停止条件（１）が満たされたか否かを判定することができる。 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.
　（供給量停止条件（１）：時間計測およびエア供給速度）
　制御部６０は、コンプレッサ１１の駆動時間を計測し、計測した時間と、コンプレッサ１１がエアドライヤ１３に向けてエアを供給しているときコンプレッサ１１のエア供給速度に基づいて、その駆動時間における累積通気量（つまり、エア供給量）を算出する。そして、制御部６０は、算出された累積通気量が第１流量閾値よりも少ない場合、供給量停止条件（１）が満たされたと判定することができる。このように、コンプレッサ１１の駆動時間とコンプレッサ１１のエア供給速度に基づいて、エア供給量を算出することで、制御部６０は、コンプレッサ１１がエアドライヤ１３に向けてエア供給している間にコンプレッサ１１のエア供給速度が変化した場合でも、供給量停止条件（１）が満たされたか否かを正確に判定できる。例えば、コンプレッサ１１の駆動開始時刻がＴ１１であり、コンプレッサ１１の駆動停止時刻Ｔ１２が時刻Ｔ１１の２分後であり、時刻Ｔ１１から１分後の時刻Ｔ１３までのコンプレッサ１１のエア供給速度が１００Ｌ／分、時刻Ｔ１３から時刻Ｔ１２までのコンプレッサ１１のエア供給速度が１５０Ｌ／分であったとする。この場合、制御部６０は、駆動時間におけるエア供給量を２５０Ｌ（１００Ｌ＋１５０Ｌ）と算出できる。なお、エア供給速度とは、コンプレッサ１１を駆動させるモータ１２の回転速度に依存している。 (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.
　同様にして、制御部６０は、流量センサ４１による測定値Ｄ１に基づいてエア供給量を算出すること以外の手法で、供給量停止条件（２）が満たされたか否かを判定することができる。 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. ..
　（供給量停止条件（２）：時間計測）
　制御部６０は、コンプレッサ１１の駆動時間が第２閾値時間よりも短い場合、制御部６０は、供給量停止条件（２）を満たしたと判定できる。 (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.
　制御部６０は、タンク圧がＰｔ２に低下した時刻から次にタンク圧がＰｔ１に達した時刻までの時間を計測し、計測した時間と第１閾値時間とを比較する。 The control unit 60 measures the time from the time when the tank pressure drops to Pt2 to the time when the tank pressure reaches Pt1 next, and compares the measured time with the first threshold time.
　第２閾値時間は、乾燥剤Ｄを通過するエアの許容量およびコンプレッサ１１のエア供給速度に基づいて決定される。例えば、乾燥剤Ｄのエアの許容量が３００Ｌであり、コンプレッサ１１のエア供給速度が１５０Ｌ／分である場合、３６秒が第２閾値時間に決定されてもよい。なお、３６秒は、コンプレッサ１１から９０Ｌのエアがエアドライヤ１３に供給されるのに要する時間である。 The second threshold 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, 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.
　すなわち、第２閾値時間に基づくエア供給量が、第３流量閾値と一致するように第２閾値時間を決定することで、所定期間におけるコンプレッサ１１からエアドライヤ１３へのエア供給量が、第３流量閾値よりも少ないか否かを判定することができる。 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.
　（供給量停止条件（２）：時間計測およびエア供給速度）
　制御部６０は、コンプレッサ１１の駆動時間を計測し、計測した時間と、コンプレッサ１１がエアドライヤ１３に向けてエアを供給しているときコンプレッサ１１のエア供給速度に基づいて、その駆動時間における累積通気量（つまり、エア供給量）を算出する。そして、制御部６０は、算出された累積通気量が第３流量閾値よりも少ない場合、供給量停止条件（２）が満たされたと判定することができる。 (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.
　また、図３のフローチャートが示す制御では、制御部６０は、供給量解除条件（１）または供給量解除条件（２）を満たした場合、制御部６０は、パージ制御弁１６の制御モードを通常モードに切り替えている。しかしながら、制御部６０は、以下に示す、回数条件、および、走行条件のいずれか１つを満たした場合に、パージ制御弁１６の制御モードを通常モードに切り替えることができる。 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 normally sets the control mode of the purge control valve 16. Switching to mode. However, the control unit 60 can switch the control mode of the purge control valve 16 to the normal mode when any one of the number of times condition and the traveling condition shown below is satisfied.
　回数条件は、指示圧停止時刻からカウントされた回数（以下、カウント回数と称す。）が、閾値回数以上であることである。カウント回数は、指示圧停止時刻以降、タンク圧がＰｔ１からＰｔ２まで低下した回数、または、指示圧停止時刻以降、タンク圧がＰｔ２からＰｔ１まで上昇した回数である。 The number of times condition is that the number of times counted from the indicated pressure stop time (hereinafter referred to as the number of times of counting) is equal to or greater than the threshold number of times. The number of counts is the number of times the tank pressure drops from Pt1 to Pt2 after the indicated pressure stop time, or the number of times the tank pressure rises from Pt2 to Pt1 after the indicated pressure stop time.
　制御部６０は、指示圧停止時刻から現在時刻までのカウント回数が閾値回数以上であった場合、パージ制御弁１６の制御モードを通常モードに切り替えることができる。制御部６０は、指示圧停止時刻から現在時刻までのカウント回数が閾値回数未満である場合、パージ制御弁１６の制御モードを切り替えず、遮断モードを維持することができる。 The control unit 60 can switch the control mode of the purge control valve 16 to the normal mode when the number of counts from the indicated pressure stop time to the current time is equal to or greater than the threshold number. When the number of counts from the indicated pressure stop time to the current time is less than the threshold number, the control unit 60 can maintain the shutoff mode without switching the control mode of the purge control valve 16.
　カウント回数は、制御部６０によってカウントされており、制御部６０は、指示圧停止時刻以後の時刻において、タンク圧がＰｔ１以上の値になってから低下していきＰｔ２以下になったときに１回カウントする。そして、タンク圧がＰｔ２以下の値からＰｔ１以上の値となり、Ｐｔ１以上の値からタンク圧がＰｔ２以下の値に低下したとき、さらに１回カウントする。もしくは、制御部６０は、指示圧停止時刻以後の時刻において、タンク圧がＰｔ２以下の値になってから上昇していきＰｔ１以上になったときに１回カウントする。そして、タンク圧がＰｔ１以上の値からＰｔ２以下の値となり、Ｐｔ２以下の値からタンク圧がＰｔ１以上の値に上昇したとき、さらに１回カウントする。つまり、制御部６０は、パージ制御弁１６の制御モードが通常モードであったとしたならば、指示圧供給配管２１が閉塞されるべきタイミングになる度に、１回カウントする。 The number of counts is counted by the control unit 60, and the control unit 60 decreases the tank pressure after reaching a value of Pt1 or more and becomes 1 when the tank pressure becomes Pt2 or less at a time after the indicated pressure stop time. Count times. Then, when the tank pressure changes from a value of Pt2 or less to a value of Pt1 or more, and the tank pressure drops from a value of Pt1 or more to a value of Pt2 or less, the count is performed once more. Alternatively, the control unit 60 counts once when the tank pressure reaches a value of Pt2 or less and then increases and becomes Pt1 or more at a time after the indicated pressure stop time. Then, when the tank pressure changes from a value of Pt1 or more to a value of Pt2 or less and the tank pressure rises from a value of Pt2 or less to a value of Pt1 or more, the count is performed once more. That is, if the control mode of the purge control valve 16 is the normal mode, the control unit 60 counts once every time the instruction pressure supply pipe 21 should be closed.
　そして、制御部６０は、現在時刻において、カウント回数が閾値回数に達したか否かを判定する。閾値回数は、例えば、２回である。 Then, the control unit 60 determines whether or not the number of counts has reached the threshold number at the current time. The threshold number is, for example, two times.
　カウント回数が閾値回数に達している場合、パージ制御弁１６がパージバルブ１３１に指示圧を供給していない期間が長引いていることを意味する。つまり、乾燥剤Ｄは、相当量の水分や油分を吸収していると考えることができる。他方、カウント回数が閾値回数に達していない場合、パージ制御弁１６がパージバルブ１３１に指示圧を供給していない期間はそれほど長引いておらず、乾燥剤Ｄは、追加で吸収可能な水分や油分の量に比較的余裕があると考えることができる。 When the number of counts reaches the threshold number, it means that the period during which the purge control valve 16 does not supply the indicated pressure to the purge valve 131 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 counts has not reached the threshold number, the period during which the purge control valve 16 does not supply the indicated pressure to the purge valve 131 is not so long, and the desiccant D contains additional absorbable water and oil. It can be considered that the amount is relatively large.
　なお、閾値回数は、意思条件が満たされたことで、パージ制御弁１６の制御モードが遮断モードに切り替えられた場合と、意思条件が満たされていないものの、他の条件が満たされてパージ制御弁１６の制御モードが遮断モードに切り替えられた場合とで、互いに異なる値に決定されてもよい。 The threshold number is determined when the control mode of the purge control valve 16 is switched to the shutoff mode because the intention condition is satisfied, and when the intention condition is not satisfied but other conditions are satisfied and the purge control is performed. The values may be different from each other depending on whether the control mode of the valve 16 is switched to the shutoff mode.
　走行条件は、車両１００のドアが閉じられたことである。制御部６０は、開信号Ｓ３を受信した直近の時刻以降に開閉検出部４２から閉信号Ｓ４を受信した場合、車両１００のドアが閉じられたと判定し、開信号Ｓ３を受信した直近の時刻以降に閉信号Ｓ４を受信していない場合、車両１００のドアが開かれたままであると判定する。制御部６０は、車両１００のドアが閉じられたと判定した場合、閉信号Ｓ４を受信した時刻から一定の時間（例えば、数秒間）、パージ制御弁１６の制御を遮断モードに維持し、一定の時間経過後、パージ制御弁１６の制御モードを通常モードに切り替え、車両１００のドアが開かれたままであると判定した場合、制御部６０は、パージ制御弁１６の制御モードを通常モードに切り替えることなく、遮断モードに維持することができる。 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 control of the purge control valve 16 in the shutoff mode for a certain period of time (for example, several seconds) from the time when the closing signal S4 is received, and keeps the control unit 60 constant. After a lapse of time, the control mode of the purge control valve 16 is switched to the normal mode, and when it is determined that the door of the vehicle 100 remains open, the control unit 60 switches the control mode of the purge control valve 16 to the normal mode. Can be maintained in cutoff mode.
　制御部６０が、閉信号Ｓ４を受信した時刻から一定の時間経過後、パージ制御弁１６の制御モードを通常モードに切り替えることで、車両１００が走行することを待ってから、パージ処理の停止を解除することができる。よって、車両１００の停車中にパージ処理が実行されることに起因する、車両１００の停車位置およびその周囲の空気の汚染を防止できる。 After a certain period of time has elapsed from the time when the control unit 60 receives the closing signal S4, the control mode of the purge control valve 16 is switched to the normal mode, so that the purge process is stopped after waiting for the vehicle 100 to travel. It can be released. 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.
　また、制御部６０は、流量センサ４１による測定値Ｄ１に基づいて指示圧停止時刻からのエア供給量を算出すること以外の手法で、供給量解除条件（１）が満たされたか否かを判定することができる。 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.
　（供給量解除条件（１）：時間計測）
　制御部６０は、指示圧停止時刻から第１所定時間が経過した場合、供給量解除条件（１）が満たされたと判定することができる。 (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.
　制御部６０は、指示圧停止時刻から時間の計測を開始し、現在時刻が指示圧停止時刻から第１所定時間経過しているか否かを判定する。 The control unit 60 starts measuring the time from the indicated pressure stop time, and determines whether or not the current time has passed the first predetermined time from the indicated pressure stop time.
　第１所定時間は、乾燥剤Ｄを通過するエアの許容量およびコンプレッサ１１のエア供給速度に基づいて決定される。例えば、乾燥剤Ｄのエアの許容量が３００Ｌであり、コンプレッサ１１のエア供給速度が１５０Ｌ／分である場合、２分３６秒が第１所定時間に決定されてもよい。なお、２分３６秒は、コンプレッサ１１から３９０Ｌのエアがエアドライヤ１３に供給されるのに要する時間である。 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, 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.
　すなわち、第１所定時間におけるエア供給量が、第２流量閾値と一致するように第１所定時間を決定することで、所定期間におけるコンプレッサ１１からエアドライヤ１３へのエア供給量が、第２流量閾値よりも少ないか否かを判定することができる。 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.
　（供給量解除条件（１）：時間計測およびエア供給速度）
　制御部６０は、指示圧停止時刻から経過した時間と、コンプレッサ１１がエアドライヤ１３に向けてエアを供給しているときコンプレッサ１１のエア供給速度に基づいて、指示圧停止時刻からのエア供給量を算出する。例えば、指示圧停止時刻がＴ２１であり、時刻Ｔ２１から２分後の時刻Ｔ２２が現在時刻であり、時刻Ｔ２１から時刻Ｔ２１の１分後の時刻Ｔ２３までのエア供給速度が１００Ｌ／分、時刻Ｔ２３から時刻Ｔ２２までの１分間のコンプレッサ１１のエア供給速度が１５０Ｌ／分であったとする。この場合、制御部６０は、指示圧停止時刻から現在時刻までのエア供給量を２５０Ｌ（１００Ｌ＋１５０Ｌ）と算出できる。そして、制御部６０は、算出したエア供給量が第２流量閾値に達した場合、供給量解除条件が満たされたと判定することができる。 (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.
　また、制御部６０は、流量センサ４１による測定値Ｄ１に基づいて指示圧停止時刻からのエア供給量を算出すること以外の手法で、供給量解除条件（２）が満たされたか否かを判定することができる。 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.
　（供給量解除条件（２）：時間計測）
　制御部６０は、指示圧停止時刻から第２所定時間が経過した場合、供給量解除条件が満たされたと判定することができる。 (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.
　制御部６０は、指示圧停止時刻から時間の計測を開始し、現在時刻が指示圧停止時刻から第２所定時間経過しているか否かを判定する。 The control unit 60 starts measuring the time from the indicated pressure stop time, and determines whether or not the current time has passed the second predetermined time from the indicated pressure stop time.
　第２所定時間は、乾燥剤Ｄを通過するエアの許容量およびコンプレッサ１１のエア供給速度に基づいて決定される。例えば、乾燥剤Ｄのエアの許容量が３００Ｌであり、コンプレッサ１１のエア供給速度が１５０Ｌ／分である場合、２分３６秒が第２所定時間に決定されてもよい。なお、２分３６秒は、コンプレッサ１１から３９０Ｌのエアがエアドライヤ１３に供給されるのに要する時間である。 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 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.
　すなわち、第２所定時間におけるエア供給量が、第４流量閾値と一致するように第２所定時間を決定することで、第２所定時間におけるコンプレッサ１１からエアドライヤ１３へのエア供給量が、第４流量閾値よりも少ないか否かを判定することができる。 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.
　（供給量解除条件（２）：時間計測およびエア供給速度）
　制御部６０は、指示圧停止時刻から経過した時間と、コンプレッサ１１がエアドライヤ１３に向けてエアを供給しているときコンプレッサ１１のエア供給速度に基づいて、指示圧停止時刻からのエア供給量を算出する。制御部６０は、算出したエア供給量が第４流量閾値に達した場合、供給量解除条件が満たされたと判定することができる。 (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.
　以上、説明したように、本実施形態によれば、制御部６０は、意思条件、供給量停止条件（１）および（２）、停車条件、パージ時間条件の少なくとも１つが満たされた場合、タンク圧に依らずに指示圧供給配管２１を閉塞させる制御モード（遮断モード）でパージ制御弁１６を制御することで、指示圧がパージバルブ１３１に供給されないようにしている。したがって、エアドライヤ１３でのパージ処理（つまり、乾燥剤Ｄの再生動作）の頻度を少なくすることができる。 As described above, according to the present embodiment, the control unit 60 tanks when at least one of the intention condition, the supply amount stop condition (1) and (2), the stop condition, and the purge time condition is satisfied. By controlling the purge control valve 16 in the control mode (cutoff mode) in which the indicated pressure supply pipe 21 is closed regardless of the pressure, the indicated pressure is prevented from being supplied to the purge valve 131. Therefore, the frequency of the purging process (that is, the regeneration operation of the desiccant D) in the air dryer 13 can be reduced.
　また、本実施形態のパージシステム１は、ガバナを備えていないので、パージシステム１を車両１００に搭載したときのパージシステム１が占める空間を小さくできる。 Further, since the purge system 1 of the present embodiment does not have a governor, the space occupied by the purge system 1 when the purge system 1 is mounted on the vehicle 100 can be reduced.
　また、本実施形態のパージシステム１は、ガバナを備えていない代わりに、圧力センサ１７およびパージ制御弁１６を備え、通常モードでパージ制御弁１６を制御することで、定期的にエアドライヤ１３でのパージ処理を実行することができる。 Further, the purge system 1 of the present embodiment is provided with a pressure sensor 17 and a purge control valve 16 instead of being provided with a governor, and by controlling the purge control valve 16 in the normal mode, the air dryer 13 periodically performs the purge system 1. The purge process can be performed.
　意思条件が満たされた場合に、制御部６０は、パージ制御弁１６の制御モードを遮断モードに切り替えることができるので、車両１００の乗員は、任意のタイミングでパージ処理を実行することができる。よって、例えば、早朝または深夜の住宅街や路地の走行時、および、出庫や入庫時等、パージ処理に伴う音を発生させたくないときに、車両１００の乗員は、パージ処理を停止させることができる。 When the intention condition is satisfied, the control unit 60 can switch the control mode of the purge control valve 16 to the shutoff mode, 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.
　供給量停止条件（１）または（２）が満たされた場合、制御部６０は、パージ制御弁１６の制御モードを遮断モードに切り替えることができるので、エアドライヤ１３の乾燥剤Ｄの水分や油分の吸収可能量を考慮してパージ処理を停止させることができる。よって、車両１００の各機器における負荷を軽減させつつ、パージ処理を停止させることができる。なお、車両１００の各機器における負荷とは、例えば、エアドライヤ１３とメインタンク１４と繋ぐ配管やメインタンク１４と各エア機器とを繋ぐ配管等が凍結することで当該配管が閉塞してしまうこと、乾燥剤Ｄがこれ以上水分を吸収しきれないために水分を多く含むエアがメインタンク１４に供給されてメインタンク１４が凍る原因となることなどである。また、車両１００の各機器における負荷には、配管やメインタンク１４等に錆が生じること、および、パージ制御弁１６等が正常に作動しなくなることが含まれる。 When the supply amount stop condition (1) or (2) is satisfied, the control unit 60 can switch the control mode of the purge control valve 16 to the shutoff mode, so that the water content and oil content of the desiccant D of the air dryer 13 can be switched. The purging process can be stopped in consideration of the amount that can be absorbed. 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. Further, the load in each device of the vehicle 100 includes that the piping, the main tank 14, and the like are rusted, and that the purge control valve 16 and the like do not operate normally.
　停車条件が満たされた場合に、制御部６０は、パージ制御弁１６の制御モードを遮断モードに切り替えることができるので、車両１００が停車中であるときに、パージ処理を停止させることができる。よって、パージ処理に伴う水分や油分、並びにそれらを含むエアの排出によって、車両１００が停止する位置、例えば、駐車場、車庫内、工場内、および、エントランス等の特定の位置の地面およびその周囲の空気を汚染することを防止することができる。 When the stop condition is satisfied, the control unit 60 can switch the control mode of the purge control valve 16 to the shutoff mode, 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.
　パージ時間条件が満たされた場合に、制御部６０は、パージ制御弁１６の制御モードを遮断モードに切り替えることができるので、乾燥剤Ｄに対して十分に再生処理が行われたか否かに基づいて、パージ処理を停止させることができる。よって、車両１００の各機器における負荷を軽減させつつ、パージ処理を停止させることができる。 When the purge time condition is satisfied, the control unit 60 can switch the control mode of the purge control valve 16 to the shutoff mode, and is based on whether or not the desiccant D has been sufficiently regenerated. The purging process can be stopped. Therefore, the purge process can be stopped while reducing the load on each device of the vehicle 100.
　制御部６０は、意思条件および供給量停止条件（１）の両方が満たされることを条件に、パージ制御弁１６の制御モードを遮断モードに切り替えることができる。これにより、車両１００の乗員がパージ処理の停止を望んだとしても、供給量停止条件（１）が満たされなければ、指示圧の供給が停止されないので、車両１００の乗員の意思だけでなく、車両１００の各機器における負荷を考慮して、パージ処理を停止させることができる。 The control unit 60 can switch the control mode of the purge control valve 16 to the shutoff mode 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.
　また、本実施形態によれば、制御部６０は、供給量解除条件（１）、供給量解除条件（２）および、回数条件のいずれかが満たされた場合、パージ制御弁１６の制御モードを通常モードに切り替えることができる。これにより、遅くとも、制御モードが通常モードに切り替えられてから次にタンク圧がＰｔ１に達する時刻までには、指示圧供給配管２１がパージ制御弁１６により開放される。パージ処理が行われない期間長引くと、乾燥剤Ｄが水分および油分を吸収できなくなり、メインタンク１４などの車両１００の各機器に負荷がかかる。本実施形態によれば、パージ処理が行われない期間が長引くことを防止し、パージ処理停止による車両１００の各機器への負荷を軽減することができる。 Further, according to the present embodiment, the control unit 60 sets the control mode of the purge control valve 16 when any of the supply amount release condition (1), the supply amount release condition (2), and the number of times condition is satisfied. You can switch to normal mode. As a result, the indicated pressure supply pipe 21 is opened by the purge control valve 16 by the time when the tank pressure reaches Pt1 next time after the control mode is switched to the normal mode at the latest. 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.
　＜変形例１＞
　以下、変形例１に係るパージシステム１について、主に上述した実施形態と異なる点を説明する。パージ制御弁１６は、図４Ａおよび図４Ｂに示されているように、複数の開閉弁で構成されている。図４Ａは、変形例１に係るパージシステム１が備えるパージ制御弁１６を示す図であり、指示圧供給配管２１が開放されている状態にあるパージシステム１が示されている。図４Ｂは、変形例１に係るパージシステム１が備えるパージ制御弁１６を示す図であり、指示圧供給配管２１が閉塞されている状態にあるパージシステム１が示されている。 <Modification example 1>
Hereinafter, the purge system 1 according to the first modification will be described mainly different from the above-described embodiment. The purge control valve 16 is composed of a plurality of on-off valves as shown in FIGS. 4A and 4B. FIG. 4A is a diagram showing a purge control valve 16 included in the purge system 1 according to the first modification, showing the purge system 1 in a state where the instruction pressure supply pipe 21 is open. FIG. 4B is a diagram showing a purge control valve 16 included in the purge system 1 according to the first modification, showing the purge system 1 in a state where the instruction pressure supply pipe 21 is closed.
　パージ制御弁１６は、指示圧供給配管２１に設けられている第１の弁１６１と、パージバルブを大気に連通させる配管２２（以下、大気開放配管と称す。）に設けられている第２の弁１６２により構成されていてもよい。第２の弁１６２が大気開放配管２２を開放すると、パージバルブ１３１が大気に連通する。なお、第１の弁１６１および第２の弁１６２は配管の開放と閉塞を切り替える弁である。 The purge control valve 16 is provided in a first valve 161 provided in the indicated pressure supply pipe 21 and a second valve provided in a pipe 22 (hereinafter, referred to as an air open pipe) that communicates the purge valve with the atmosphere. It may be composed of 162. When the second valve 162 opens the air opening pipe 22, 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.
　制御部６０は、指示圧供給配管２１を開放するタイミングで第１の弁により指示圧供給配管２１を開放させ、第２の弁により大気開放配管２２を閉塞させる（図４Ａ参照）。また、制御部６０は、指示圧供給配管２１を閉塞するタイミングで第１の弁により指示圧供給配管２１を閉塞させ、第２の弁により大気開放配管２２を開放させる（図４Ｂ参照）。 The control unit 60 opens the instruction pressure supply pipe 21 by the first valve at the timing of opening the instruction pressure supply pipe 21, and closes the atmosphere release pipe 22 by the second valve (see FIG. 4A). Further, the control unit 60 closes the instruction pressure supply pipe 21 by the first valve at the timing of closing the instruction pressure supply pipe 21, and opens the atmosphere release pipe 22 by the second valve (see FIG. 4B).
　＜変形例２＞
　以下、変形例２に係るパージシステム１について、主に上述した実施形態と異なる点を説明する。図５は、変形例２に係るパージシステム１の主要構成を示す図である。変形例２において、パージ制御弁１６は、エアドライヤ１３の内部に配置されている。さらに、指示圧供給配管２１は、エアドライヤ１３のエアをメインタンク１４に供給する配管（以下、タンク上流配管と称す。）と、パージバルブ１３１とをパージ制御弁１６を介して接続している。すなわち、変形例２において、指示圧は、タンク上流配管、および指示圧供給配管２１を経てパージバルブ１３１に供給される。 <Modification 2>
Hereinafter, the purge system 1 according to the second modification will be described mainly different from the above-described embodiment. FIG. 5 is a diagram showing a main configuration of the purge system 1 according to the second modification. In the second modification, the purge control valve 16 is arranged inside the air dryer 13. Further, the instruction pressure supply pipe 21 connects the pipe that supplies the air of the air dryer 13 to the main tank 14 (hereinafter, referred to as a tank upstream pipe) and the purge valve 131 via the purge control valve 16. That is, in the second modification, the indicated pressure is supplied to the purge valve 131 via the tank upstream pipe and the indicated pressure supply pipe 21.
　パージ制御弁１６の制御内容は、上述の実施形態と同様であり、変形例２に係るパージシステム１によれば、実施形態と同様の効果が得られる。また、変形例２のパージ制御弁１６も変形例１で示されているように、複数の開閉弁で構成されていてもよい。 The control content of the purge control valve 16 is the same as that of the above-described embodiment, and according to the purge system 1 according to the second modification, the same effect as that of the embodiment can be obtained. Further, the purge control valve 16 of the modification 2 may also be composed of a plurality of on-off valves as shown in the modification 1.
　＜その他変形例＞ <Other variants>
　コンプレッサ１１がエアドライヤ１３に向けてエア供給を行っているとき、制御部６０は、コンプレッサ１１の供給速度を変化させてもよい。つまり、制御部６０は、モータ１２の回転速度を変化させてもよい。 When the compressor 11 is supplying air to 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.
　パージ処理が長時間行われず、エア機器によるエア使用量が少ない場合、メインタンク１４のエア量が増加し続け、タンク圧が限界値に達してしまうことがある。このため、制御部６０は、圧力センサ１７によるタンク圧の測定値Ｄ０が限界値よりも小さい所定の圧力値に達したときに、コンプレッサ１１によるエア供給を停止させてもよい。 If the purge process is not performed for a long time and the amount of air used by the air equipment is small, the amount of air in the main tank 14 may continue to increase and the tank pressure may reach the limit value. Therefore, the control unit 60 may stop the air supply by the compressor 11 when the measured value D0 of the tank pressure by the pressure sensor 17 reaches a predetermined pressure value smaller than the limit value.
　さらに、制御部６０は、エアドライヤ１３内部の湿度が所定の湿度未満であれば、パージ制御弁１６の制御モードを通常モードから遮断モードに切り替え、エアドライヤ１３内部の湿度が、別の所定の湿度に達したときに、パージ制御弁１６の制御モードを、遮断モードから通常モードに切り替えてもよい。ここで、別の所定の湿度は、所定の湿度よりも大きい。 Further, if the humidity inside the air dryer 13 is less than a predetermined humidity, the control unit 60 switches the control mode of the purge control valve 16 from the normal mode to the shutoff mode, and the humidity inside the air dryer 13 becomes another predetermined humidity. When it reaches, the control mode of the purge control valve 16 may be switched from the shutoff mode to the normal mode. Here, another predetermined humidity is larger than the predetermined humidity.
　また、流量センサ４１に替えて、流速センサが設けられていてもよい。この場合、流速センサは、流速センサの配管を通過するエアの流速を測定し、その測定値を制御部６０に送信する、制御部６０は、測定値と、流速センサの配管の断面積とに基づいて、累積通気量（つまり、エア供給量）を算出することができる。 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.
　本開示のパージシステム１は、パージ制御弁１６の動作により、パージバルブ１３１だけでなく、コンプレッサ１１にもエアが送られる方式の構成を有していてもよい。また、コンプレッサ１１は必ずしも電動コンプレッサでなくてもよく、エンジン等の駆動源の動作と連動して動作するコンプレッサでもよい。 The purge system 1 of the present disclosure may have a configuration in which air is sent not only to the purge valve 131 but also to the compressor 11 by the operation of the purge control valve 16. 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.
　なお、上述した実施形態では、車両１００は大型車両であるとして説明したが、エアを使用する機器が備えられていれば、どんな車両であってもよい。車両１００は、例えば、電気自動車であってもよいし、エンジン車であってもよい。例えば、指示圧がコンプレッサ１１側に供給される構成を有するパージシステムは、エンジン車に搭載可能である。 Although the 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. The vehicle 100 may be, for example, an electric vehicle or an engine vehicle. For example, a purge system having a configuration in which the indicated pressure is supplied to the compressor 11 side can be mounted on an engine vehicle.
　さらに、上述したパージシステム１は、車両１００だけでなく、エアを使用する装置であればどんな装置に搭載されていてもよい。 Further, the purge system 1 described above may be mounted not only on the vehicle 100 but also on any device that uses air.
　前述した実施形態は、本開示を実施するにあたっての具体化の一例を示したものに過ぎず、これらによって本開示の技術的範囲が限定的に解釈されてはならないものである。すなわち、本開示はその要旨、またはその主要な特徴から逸脱することの無い範囲で、様々な形で実施することができる。 The above-described embodiment is merely an example 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.
　本出願は、２０２０年３月３０日付で出願された日本国特許出願（特願２０２０－０６０５１３）に基づくものであり、その内容はここに参照として取り込まれる。 This application is based on a Japanese patent application (Japanese Patent Application No. 2020-060513) filed on March 30, 2020, the contents of which are incorporated herein by reference.
　本開示は、パージ処理によりエアドライヤ内の乾燥剤を再生するパージシステムに好適に適用し得る。 The present disclosure can be suitably applied to a purge system that regenerates a desiccant in an air dryer by a purge process.
　１　パージシステム
　１１　コンプレッサ
　１２　モータ
　１３　エアドライヤ
　１３１　パージバルブ
　１４　メインタンク
　１６　パージ制御弁
　１６１　第１の弁
　１６２　第２の弁
　１７　圧力センサ
　２１　指示圧供給配管
　２２　大気開放配管
　４１　流量センサ
　４２　開閉検出部
　４３　操作検出部
　５０　出力部
　６０　制御部
　１００　車両
　Ｓ３　開信号
　Ｓ４　閉信号
　Ｓ５　操作検出信号
　Ｄ０、Ｄ１　測定値 1 Purge system 11 Compressor 12 Motor 13 Air dryer 131 Purge valve 14 Main tank 16 Purge control valve 161 First valve 162 Second valve 17 Pressure sensor 21 Instructed pressure supply pipe 22 Air release pipe 41 Flow sensor 42 Open / close detection unit 43 Operation detection Part 50 Output part 60 Control part 100 Vehicle S3 Open signal S4 Close signal S5 Operation detection signal D0, D1 Measured value

Claims (14)

  1. 　メインタンクと、
    　エアを吐出するコンプレッサと、
    　パージバルブを有しており、前記コンプレッサから吐出されたエアを前記メインタンクに供給するエアドライヤと、
    　前記メインタンク内の圧力であるタンク圧が第１の圧力値に達したときに前記メインタンクから前記パージバルブへの指示圧の供給を開始し、前記タンク圧が前記第１の圧力値よりも小さい第２の圧力値に低下したときに前記指示圧の供給を停止する第１の制御モード、および、前記タンク圧に依らずに前記指示圧の供給を停止する第２の制御モードのいずれかの制御モードで制御されるパージ制御弁と、
    　前記パージ制御弁を制御しており、所定の操作が検出されたこと、所定期間における前記コンプレッサによる前記エアドライヤへのエア供給量が第１の閾値よりも少ないと判定したこと、および、前記パージ制御弁が前記指示圧の供給を開始した時刻から前記パージ制御弁が前記指示圧の供給を停止した時刻までの時間が基準時間以上であることの少なくともいずれかが満たされた場合、前記パージ制御弁の制御モードを前記第１の制御モードから前記第２の制御モードに切り替える制御部と、
    　を備えるパージシステム。     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
    When the tank pressure, which is the pressure in the main tank, reaches the first pressure value, the supply of the indicated pressure from the main tank to the purge valve is started, and the tank pressure is smaller than the first pressure value. One of a first control mode in which the supply of the indicated pressure is stopped when the pressure drops to the second pressure value and a second control mode in which the supply of the indicated pressure is stopped regardless of the tank pressure. Purge control valve controlled in control mode and
    The purge control valve is controlled, 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 purge control. When at least one of the time from the time when the valve starts supplying the indicated pressure to the time when the purge control valve stops supplying the indicated pressure is equal to or longer than the reference time is satisfied, the purge control valve is satisfied. A control unit that switches the control mode of the above from the first control mode to the second control mode, and
    Purge system with.
  2. 　前記コンプレッサから前記エアドライヤへのエアの流量を測定し、前記流量の測定値を前記制御部に送信する流量センサをさらに備え、
    　前記制御部は、前記測定値に基づいて、前記コンプレッサによる前記エアドライヤへのエア供給が開始されてから前記コンプレッサによる前記エア供給が停止されるまでの前記エア供給量を算出し、該算出されたエア供給量が前記第１の閾値よりも少ない場合、前記パージ制御弁の制御モードを前記第１の制御モードから前記第２の制御モードに切り替える、
    　請求項１に記載のパージシステム。     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. When the amount of air supplied is less than the first threshold value, the control mode of the purge control valve is switched from the first control mode to the second control mode.
    The purge system according to claim 1.
  3. 　前記コンプレッサによる前記エアドライヤへのエア供給が開始されてから前記コンプレッサによる前記エア供給が停止されるまでの時間が閾値時間よりも短い場合、前記パージ制御弁の制御モードを前記第１の制御モードから前記第２の制御モードに切り替える、
    　請求項１に記載のパージシステム。     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 mode of the purge control valve is changed from the first control mode. Switching to the second control mode,
    The purge system according to claim 1.
  4. 　前記制御部は、前記コンプレッサによる前記エアドライヤへのエア供給が開始されてから前記コンプレッサによる前記エア供給が停止するまでの時間と、前記コンプレッサのエア供給速度とに基づいて、前記エア供給が開始されてから前記エア供給が停止するまでの時間における前記エア供給量を算出し、該算出されたエア供給量が前記第１の閾値よりも少ない場合、前記制御部は、前記パージ制御弁の制御モードを前記第１の制御モードから前記第２の制御モードに切り替える、
    　請求項１に記載のパージシステム。     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 is in the control mode of the purge control valve. To switch from the first control mode to the second control mode.
    The purge system according to claim 1.
  5. 　前記制御部は、前記タンク圧が前記第１の圧力値に達したときに前記エア供給を停止させ、前記タンク圧が前記第２の圧力値に低下したときに前記エア供給を開始させる、
    　請求項２に記載のパージシステム。     The control unit stops the air supply when the tank pressure reaches the first pressure value, and starts the air supply when the tank pressure drops to the second pressure value.
    The purge system according to claim 2.
  6. 　前記パージバルブに前記指示圧が供給されなくなった時刻からの前記エア供給量が、前記第１の閾値以上の値である第２の閾値に達した場合、前記制御部は、前記パージ制御弁の制御モードを前記第２の制御モードから前記第１の制御モードに切り替える、
    　請求項５に記載のパージシステム。     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 controls the purge control valve. Switching the mode from the second control mode to the first control mode,
    The purge system according to claim 5.
  7. 　前記パージバルブに前記指示圧が供給されなくなった時刻から所定時間が経過した場合、前記制御部は、前記パージ制御弁の制御モードを前記第２の制御モードから前記第１の制御モードに切り替える、
    　請求項５に記載のパージシステム。     When a predetermined time has elapsed from the time when the indicated pressure is no longer supplied to the purge valve, the control unit switches the control mode of the purge control valve from the second control mode to the first control mode.
    The purge system according to claim 5.
  8. 　前記制御部は、前記パージバルブに前記指示圧が供給されなくなった時刻から経過した時間と、前記コンプレッサのエア供給速度とに基づいて、前記パージバルブに前記指示圧が供給されなくなった時刻からの前記エア供給量を算出し、該算出されたエア供給量が前記第１の閾値以上の値である第２の閾値に達した場合、前記制御部は、前記パージ制御弁の制御モードを前記第２の制御モードから前記第１の制御モードに切り替える、
    　請求項５に記載のパージシステム。     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. When the supply amount is calculated and the calculated air supply amount reaches the second threshold value which is a value equal to or higher than the first threshold value, the control unit sets the control mode of the purge control valve to the second threshold value. Switching from the control mode to the first control mode,
    The purge system according to claim 5.
  9. 　前記制御部は、前記パージバルブに前記指示圧が供給されなくなった時刻から、前記タンク圧が前記第１の圧力値から前記第２の圧力値まで低下した回数をカウントし、カウントされた回数が閾値回数に達した場合、前記パージ制御弁の制御モードを前記第２の制御モードから前記第１の制御モードに切り替える、
    　請求項５に記載のパージシステム。     The control unit counts the number of times the tank pressure has decreased from the first pressure value to the second pressure value from the time when the indicated pressure is no longer supplied to the purge valve, and the counted number of times is a threshold value. When the number of times is reached, the control mode of the purge control valve is switched from the second control mode to the first control mode.
    The purge system according to claim 5.
  10. 　前記制御部は、前記パージバルブに前記指示圧が供給されなくなった時刻から、前記タンク圧が前記第２の圧力値から前記第１の圧力値まで上昇した回数をカウントし、カウントされた回数が閾値回数に達した場合、前記パージ制御弁の制御モードを前記第２の制御モードから前記第１の制御モードに切り替える、
    　請求項４に記載のパージシステム。     The control unit counts the number of times the tank pressure rises from the second pressure value to the first pressure value from the time when the indicated pressure is no longer supplied to the purge valve, and the counted number of times is a threshold value. When the number of times is reached, the control mode of the purge control valve is switched from the second control mode to the first control mode.
    The purge system according to claim 4.
  11. 　前記パージ制御弁は、前記メインタンクと前記パージバルブとを繋ぐ配管に設けられている第１の弁と、開放することで前記第１の弁と前記パージバルブを大気に連通させる第２の弁とを有し、
    　前記制御部は、前記指示圧の供給を停止するタイミングで前記第１の弁を閉塞させ、かつ、前記第２の弁を開放させ、前記指示圧の供給を開始するタイミングで、前記第１の弁を開放させ、かつ、前記第２の弁を閉塞させる、
    　請求項１に記載のパージシステム。     The purge control valve includes a first valve provided in a pipe connecting the main tank and the purge valve, and a second valve that opens the first valve and the purge valve to communicate with the atmosphere. Have and
    The control unit closes the first valve at the timing of stopping the supply of the instruction pressure, opens the second valve, and starts the supply of the instruction pressure at the timing of starting the supply of the instruction pressure. The valve is opened and the second valve is closed.
    The purge system according to claim 1.
  12. 　請求項１に記載のパージシステムを備える車両。 A vehicle equipped with the purge system according to claim 1.
  13. 　ドアと、
    　前記ドアを開く操作を検出した場合、前記ドアが開かれたことを知らせる開信号を前記制御部に送信する開閉検出部と、をさらに備え、
    　前記制御部は、前記開信号を受信した場合、前記パージ制御弁の制御モードを前記第２の制御モードから前記第１の制御モードに切り替える、
    　請求項１２に記載の車両。     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 switches the control mode of the purge control valve from the second control mode to the first control mode.
    The vehicle according to claim 12.
  14. 　パージ停止を指示する操作を検出した場合、前記指示する操作が検出されたことを知らせる操作検出信号を前記制御部に送信する操作検出部をさらに備え、
    　前記制御部は、前記操作検出信号を受信した場合、前記パージ制御弁の制御モードを前記第２の制御モードから前記第１の制御モードに切り替える、
    　請求項１２に記載の車両。
          When an operation instructing the purge stop is detected, an operation detection unit for transmitting an operation detection signal notifying that the operation to be instructed has been detected is further provided.
    When the control unit receives the operation detection signal, the control unit switches the control mode of the purge control valve from the second control mode to the first control mode.
    The vehicle according to claim 12.
PCT/JP2021/013440 2020-03-30 2021-03-30 Purge system and vehicle WO2021200887A1 (en)

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JPH01174031U (en) * 1988-05-26 1989-12-11
JPH0470567U (en) * 1990-10-31 1992-06-23
JPH0660425U (en) * 1993-01-27 1994-08-23 日野自動車工業株式会社 Vehicle air storage device
JP2000051637A (en) * 1998-08-07 2000-02-22 Nissan Diesel Motor Co Ltd Purge controller for air dryer
JP2004526628A (en) * 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 Air dryer regeneration
JP2010221110A (en) * 2009-03-23 2010-10-07 Nabtesco Automotive Corp Compressed-air feeder for vehicle
JP2013099720A (en) * 2011-11-09 2013-05-23 Hino Motors Ltd Air supply system
JP2015051697A (en) * 2013-09-06 2015-03-19 日野自動車株式会社 Air supply system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01174031U (en) * 1988-05-26 1989-12-11
JPH0470567U (en) * 1990-10-31 1992-06-23
JPH0660425U (en) * 1993-01-27 1994-08-23 日野自動車工業株式会社 Vehicle air storage device
JP2000051637A (en) * 1998-08-07 2000-02-22 Nissan Diesel Motor Co Ltd Purge controller for air dryer
JP2004526628A (en) * 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 Air dryer regeneration
JP2010221110A (en) * 2009-03-23 2010-10-07 Nabtesco Automotive Corp Compressed-air feeder for vehicle
JP2013099720A (en) * 2011-11-09 2013-05-23 Hino Motors Ltd Air supply system
JP2015051697A (en) * 2013-09-06 2015-03-19 日野自動車株式会社 Air supply system

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