WO2020194926A1 - Dispositif de suspension pneumatique - Google Patents

Dispositif de suspension pneumatique Download PDF

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Publication number
WO2020194926A1
WO2020194926A1 PCT/JP2019/049625 JP2019049625W WO2020194926A1 WO 2020194926 A1 WO2020194926 A1 WO 2020194926A1 JP 2019049625 W JP2019049625 W JP 2019049625W WO 2020194926 A1 WO2020194926 A1 WO 2020194926A1
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WIPO (PCT)
Prior art keywords
air
valve
exhaust
compressor
vehicle height
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Application number
PCT/JP2019/049625
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English (en)
Japanese (ja)
Inventor
義則 河合
小林　寛
酒井　博史
Original Assignee
日立オートモティブシステムズ株式会社
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Application filed by 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Publication of WO2020194926A1 publication Critical patent/WO2020194926A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
    • B60G17/052—Pneumatic spring characteristics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam

Definitions

  • the present disclosure relates to an air suspension device mounted on a vehicle represented by a four-wheeled vehicle, for example, so as to adjust the vehicle height.
  • the open system has the advantages that the system configuration is simple and the number of components can be reduced. However, since the air is compressed from the atmospheric pressure state, it takes time to boost the compressed air to a desired pressure.
  • the closed system air suspension device has an advantage that the compressed air can be boosted to a desired pressure in a short time because the pressure of the suction air can be made higher than the atmospheric pressure. ..
  • Patent Document 1 a temperature sensor and a humidity sensor are used to determine the regeneration time of the air dryer. For this reason, the regenerating process of the air dryer may be performed unexpectedly for the driver of the vehicle, and the driver feels uncomfortable or uncomfortable. Further, since the number of sensors is increased by the temperature sensor and the humidity sensor, there is a problem that the workability at the time of assembly is lowered and the manufacturing cost is increased.
  • An object of the embodiment of the present invention is to provide an air suspension device capable of efficiently regenerating an air dryer and improving reliability without increasing the number of sensors.
  • One embodiment of the present invention is an air suspension device provided in a vehicle, a compressor that compresses air, a tank configured to store air, and a suction side of the compressed air in the tank.
  • a first passage for supplying to the compressor a second passage connecting the discharge side of the compressor and the tank, an air suspension connected to the discharge side of the compressor via an air dryer, and a first passage provided in the first passage.
  • the first valve, the second valve, and the third valve are provided with a control means for controlling the opening and closing of the first valve, the second valve, and the third valve.
  • the air dryer can be efficiently regenerated without increasing the number of sensors, and the reliability of the device can be improved.
  • FIGS. 1 to 3 show the first embodiment.
  • a total of four air suspensions 1 are on the left front wheel (FL), right front wheel (FR), left rear wheel (RL), and right rear wheel (RR) side of the vehicle, and each axle side and vehicle body side of the vehicle. It is provided between (neither is shown).
  • These air suspensions 1 are pneumatic devices that adjust the vehicle height according to the expansion and contraction of the air chamber 1C by supplying and discharging compressed air into the air chamber 1C described later.
  • Each air suspension 1 includes, for example, a cylinder 1A attached to the axle side of the vehicle, and a piston rod 1B whose protruding end side is attached to the vehicle body side so as to expand and contract in the axial direction (upward and downward) from the inside of the cylinder 1A. It is composed of an air chamber 1C that is stretchably provided between the protruding end side of the piston rod 1B and the cylinder 1A and operates as an air spring.
  • the air chamber 1C of each air suspension 1 is expanded and contracted in the axial direction by supplying and discharging compressed air from the branch pipe 10A described later.
  • the piston rod 1B expands and contracts in the axial direction from the inside of the cylinder 1A, and the height (vehicle height) of the vehicle can be adjusted according to the supply / discharge amount of the compressed air.
  • the compressor device 2 is a device that compresses air and supplies compressed air to the air chamber 1C of the air suspension 1.
  • the compressor device 2 includes a compressor 3 as a compressor main body, an electric motor 4 for driving and stopping the compressor 3, and an intake pipe line connected to a suction side 3A (hereinafter, referred to as an intake side 3A) of the compressor 3. 5, the supply / exhaust pipe line 6 connected to the discharge side 3B of the compressor 3, the air dryer 7 and the slow return valve 8 provided in the supply / discharge pipe line 6, the intake valve 9 and the tank side suction pipe line described later. 13.
  • the intake solenoid valve 14, the tank pipe line 15, the return solenoid valve 16, the supply / discharge switching valve 17, the recirculation pipe line 18, the exhaust pipe line 19, the exhaust solenoid valve 20, and the like are included.
  • the compressor 3 generates compressed air while sucking air from its intake side 3A.
  • the compressor 3 is composed of, for example, a reciprocating compressor, a scroll compressor, or the like.
  • the compressed air generated from the compressor 3 is supplied to the air chamber 1C or the tank 12 of the air suspension 1 which is a pneumatic device.
  • the compressor 3 is rotationally driven by an electric motor 4 as a drive source.
  • the electric motor 4 is driven and stopped by a controller 22 (see FIG. 2) described later.
  • a drive source such as a linear motor may be used.
  • the intake pipe line 5 is connected to the intake side 3A of the compressor 3.
  • a supply / discharge pipe line 6 is connected to the discharge side 3B of the compressor 3.
  • One end side of the supply / discharge pipe line 6 is connected to the discharge side 3B of the compressor 3.
  • the other end side of the supply / discharge pipe line 6 is connected to the air conduit 10 via a supply / discharge switching valve 17, which will be described later.
  • An air dryer 7 and a slow return valve 8 are provided at an intermediate position of the supply / discharge pipe line 6.
  • the intake pipe line 5 of the compressor device 2 constitutes the intake passage of the compressor 3.
  • the tank-side suction pipe 13 and the reflux pipe 18, which will be described later, are connected to each other.
  • the tank-side suction pipe line 13 and the return pipe line 18 may be separately connected to the intake pipe line 5 before and after the connection point 5A.
  • One end side of the intake pipe line 5 is an intake port 5B that opens to the outside of the compressor device 2 (compressor 3).
  • the intake port 5B is provided with a filter for removing dust and the like in the air.
  • the intake port 5B is a port for sucking outside air into the intake side 3A when the compressor 3 is driven.
  • the other end side of the intake pipe line 5 is connected to the intake side 3A of the compressor 3.
  • An intake valve 9 is provided in the middle of the intake pipe line 5.
  • the intake valve 9 is provided between the connection point 5A and the intake port 5B in the middle of the intake pipe line 5.
  • the intake valve 9 is a check valve configured to take in air from the atmosphere through the intake port 5B. That is, the intake valve 9 including the check valve opens when the pressure on the intake side 3A of the compressor 3 becomes atmospheric pressure or less at the position of the connection point 5A, and air from the outside (atmosphere) via the intake port 5B. Is configured to inhale.
  • the intake valve 9 functions as a so-called suction valve.
  • the intake valve 9 is composed of a check valve.
  • the intake valve 9 allows air to flow from the intake port 5B toward the inside of the intake pipe 5 (that is, the connection point 5A side of the intake pipe 5), and blocks the reverse flow. Therefore, when the pressure in the intake pipe 5 (that is, the connection point 5A side of the intake pipe 5) becomes higher than the atmospheric pressure (positive pressure), the intake valve 9 is closed. At this time, compressed air from the air suspension 1 or the tank 12 is supplied (sucked) to the intake side 3A of the compressor 3 via the tank side suction pipe line 13, the intake solenoid valve 14, or the return pipe line 18.
  • the supply / discharge pipe line 6 constitutes a supply / discharge passage for supplying / discharging compressed air generated from the compressor 3 to the air chamber 1C of the air suspension 1.
  • the compressed air supplied to the air chamber 1C of the air suspension 1 flows back from the air chamber 1C through the air supply / exhaust pipe line 6 and the throttle 8A of the slow return valve 8, for example, when the vehicle height is lowered. It is discharged. Further, the compressed air in the air suspension 1 (air chamber 1C) can be discharged so as to accumulate pressure in the tank 12 via the tank pipe line 15 and the return solenoid valve 16 described later.
  • the supply / exhaust pipe line 6 is provided with the exhaust pipe line 19 branched from the connection point 6A located between the discharge side 3B of the compressor 3 and the air dryer 7.
  • a tank pipe line 15 is branched from the connection point 6B of the water supply / discharge pipe line 6 located between the slow return valve 8 and the supply / discharge switching valve 17.
  • the air dryer 7 and the slow return valve 8 are provided in the supply / discharge pipe line 6 at positions between the connection points 6A and 6B.
  • the air dryer 7 constitutes an air drying means provided in the middle of the supply / discharge pipe line 6.
  • the air dryer 7 contains, for example, a desiccant such as silica gel or a water adsorbent (not shown).
  • the air dryer 7 is arranged between the discharge side 3B of the compressor 3 and the slow return valve 8.
  • the slow return valve 8 is composed of a parallel circuit of the throttle 8A and the check valve 8B.
  • the check valve 8B does not open to throttle the flow rate of the compressed air with respect to the forward flow described later.
  • the check valve 8B closes against the flow in the reverse direction. Since the flow rate of the compressed air at this time is throttled by the throttle 8A, the compressed air slowly flows back in the air dryer 7 at a small flow rate.
  • the air dryer 7 brings the compressed air into contact with the moisture adsorbent inside when the high-pressure compressed air generated by the compressor 3 flows forward in the supply / discharge pipe line 6 toward the air suspension 1. Adsorbs water. As a result, dry compressed air is supplied from the air dryer 7 toward the air suspension 1 (air chamber 1C) or the tank 12. On the other hand, when the compressed air (exhaust) discharged from the air suspension 1 (air chamber 1C) or the tank 12 flows in the reverse direction in the air dryer 7 (supply / exhaust pipe line 6), the dry air flows back in the air dryer 7. To do. Therefore, the moisture adsorbent in the air dryer 7 is desorbed by the dry air. As a result, the water adsorbent of the air dryer 7 is regenerated and returned to a state in which water can be adsorbed again.
  • the air chamber 1C of the air suspension 1 is connected to the supply / discharge pipe line 6 of the compressor 3 via the air conduit 10 and the supply / discharge switching valve 17.
  • the air conduit 10 is provided with a plurality of (for example, four) branch pipes 10A branched from each other.
  • the tip end side of each branch pipe 10A is detachably connected to the air chamber 1C of the air suspension 1.
  • the fourth passage connecting the air dryer 7 and the air suspension 1 is composed of, for example, a part of the supply / exhaust pipe line 6 and the air conduit 10.
  • a fourth valve (supply / discharge switching valve 17 described later) is provided in the fourth passage.
  • the compressed air supply / exhaust valve 11 is provided in the middle of each branch pipe 10A in order to control the supply / exhaust of compressed air to the air chamber 1C of the air suspension 1.
  • the air supply / exhaust valve 11 is composed of, for example, an electromagnetic switching valve (solenoid valve) having two ports and two positions.
  • the air supply / exhaust valve 11 is normally placed at the valve closing position (a).
  • the air supply / exhaust valve 11 is excited by a control signal from the controller 22, which will be described later, the air supply / exhaust valve 11 is switched from the valve closing position (a) to the valve opening position (b).
  • each supply / exhaust valve 11 may be provided by being connected between the air chamber 1C of the air suspension 1 and the branch pipe 10A. Further, the air supply / exhaust valve 11 has a function as a relief valve (safety valve). Therefore, when the pressure in the air chamber 1C exceeds the relief set pressure, the air supply / exhaust valve 11 is temporarily switched from the valve closing position (a) to the valve opening position (b) as a relief valve even if the demagnetization remains. The excess pressure at this time can be released into the air conduit 10.
  • a relief valve safety valve
  • the tank 12 for storing compressed air has a connecting pipe 12A made of, for example, a flexible hose.
  • One end of the connecting pipe 12A is removably connected to the tank 12.
  • the other end of the connecting pipe 12A is connected to the tank-side suction pipe 13 and the tank pipe 15, which will be described later.
  • the connecting pipe 12A of the tank 12 is connected to the intake side 3A of the compressor 3 via the tank side suction pipe 13 as the first passage.
  • One end of the tank-side suction pipe 13 is connected to the tank 12 (connection pipe 12A).
  • the other end of the tank-side suction line 13 is connected to the intake line 5 at the position of the connection point 5A. That is, the connection point 5A is a position between the intake side 3A of the compressor 3 and the intake valve 9, and the intake pipe 5 is the tank side suction pipe so that the tank side suction pipe 13 branches from the intake pipe 5. It is connected to the road 13.
  • the tank side suction pipe line 13 is provided with an intake solenoid valve 14 for supplying and stopping the compressed air in the tank 12 to the intake side 3A of the compressor 3.
  • the intake solenoid valve 14 is composed of, for example, an electromagnetic switching valve (solenoid valve) having two ports and two positions.
  • the intake solenoid valve 14 is normally placed in the valve closed position (c).
  • the intake solenoid valve 14 is switched from the valve closing position (c) to the valve opening position (d).
  • the intake solenoid valve 14 has a function as a relief valve (safety valve) like the above-mentioned supply / exhaust valve 11.
  • the intake solenoid valve 14 is an on / off type two-way solenoid valve composed of a valve closing position (c) and a valve opening position (d).
  • a highly versatile solenoid switching valve can be adopted, and an expensive valve such as a three-way solenoid valve can be eliminated.
  • a highly versatile two-way solenoid valve can be adopted as in the intake solenoid valve 14.
  • the connecting pipe 12A of the tank 12 is connected to the discharge side 3B of the compressor 3 via a tank pipe 15 as a second passage.
  • One end of the tank pipeline 15 is connected to the tank 12 (connecting pipe 12A).
  • the other end of the tank line 15 is connected so as to branch off from the supply / discharge line 6 at the position of the connection point 6B. That is, at the connection point 6B, the supply / discharge pipe 6 is a tank pipe so that the tank pipe 15 is branched from the supply / discharge pipe 6 at a position between the slow return valve 8 and the supply / discharge switching valve 17. It is connected to the road 15.
  • the tank pipeline 15 is provided with a return solenoid valve 16 as a return valve for supplying and stopping the compressed air in the tank 12 so as to return it to the supply / exhaust pipeline 6.
  • the return solenoid valve 16 is composed of, for example, a two-way solenoid valve (solenoid valve) having two ports and two positions.
  • the return solenoid valve 16 is normally placed at the valve closing position (e).
  • the return solenoid valve 16 is excited by a control signal from the controller 22, the return solenoid valve 16 is switched from the valve closing position (e) to the valve opening position (f).
  • the return solenoid valve 16 When the return solenoid valve 16 is opened, for example, the compressed air in the air suspension 1 can be accumulated so as to return to the tank 12 via the tank pipe line 15.
  • the return solenoid valve 16 has a function as a relief valve (safety valve) like the above-mentioned supply / exhaust valve 11.
  • the supply / discharge switching valve 17 constitutes a fourth valve provided in a fourth passage (for example, a part of the supply / discharge pipe line 6 and the air conduit 10) connecting the air dryer 7 and the air suspension 1.
  • the supply / discharge switching valve 17 is a valve that selectively connects the air conduit 10 on the air suspension 1 side to the supply / discharge pipe line 6 or the return pipe line 18.
  • the supply / discharge switching valve 17 is composed of, for example, an electromagnetic direction switching valve (that is, a three-way solenoid valve) having three ports and two positions. That is, the supply / discharge switching valve 17 supplies the compressed air generated by the compressor 3 to the air chamber 1C of the air suspension 1 and discharges the compressed air in the air chamber 1C through the supply / discharge pipe line 6. It is selectively switched between the exhaust position (g) and the recirculation position (h) in which the compressed air in the air chamber 1C is recirculated to the intake side 3A of the compressor 3 via the recirculation pipe line 18.
  • the return pipe line 18 is a bypass passage provided by bypassing the compressor 3, the supply / discharge pipe line 6, the air dryer 7, and the slow return valve 8.
  • One end of the return pipe 18 can be connected to the air conduit 10 on the air suspension 1 side via the supply / discharge switching valve 17.
  • the other end of the return line 18 is connected to the intake line 5 at the position of the connection point 5A. Therefore, when the supply / discharge switching valve 17 is switched to the return position (h), the return pipe 18 bypasses the supply / discharge pipe 6 for the compressed air discharged from the air chamber 1C of the air suspension 1. As described above, the compressor 3 is returned to the intake side 3A.
  • the exhaust pipe line 19 is a third passage for exhausting the compressed air in the supply / exhaust pipe line 6 to the outside.
  • An exhaust solenoid valve 20 is provided in the middle of the exhaust pipe line 19.
  • One end of the exhaust line 19 is connected to the supply / discharge line 6 at a position at the connection point 6A.
  • the other end of the exhaust pipeline 19 serves as an exhaust port 19A and extends to the outside of the compressor device 2.
  • the tip of the exhaust port 19A is open to the outside air.
  • the exhaust solenoid valve 20 as the exhaust valve (third valve) is provided in the exhaust pipeline 19 as the third passage.
  • the exhaust solenoid valve 20 is composed of, for example, a two-way solenoid valve (solenoid valve) having two ports and two positions.
  • the exhaust solenoid valve 20 is normally placed in the valve closed position (i).
  • the exhaust solenoid valve 20 is excited by the control signal from the controller 22, the exhaust solenoid valve 20 is switched from the valve closing position (i) to the valve opening position (j).
  • the exhaust solenoid valve 20 that is, the third valve
  • the exhaust pipeline 19 as the third passage is connected to the atmosphere.
  • the exhaust solenoid valve 20 When the exhaust solenoid valve 20 is opened, the compressed air in the air suspension 1 is exhausted to the outside from the exhaust port 19A via the supply / exhaust pipe line 6, the throttle 8A of the slow return valve 8, the air dryer 7, and the exhaust pipe line 19 ( Can be opened). Further, when the exhaust solenoid valve 20 is opened, the compressed air in the tank 12 is supplied to the tank pipe line 15, the return solenoid valve 16, the supply / exhaust pipe line 6, the throttle 8A of the slow return valve 8, the air dryer 7, and the exhaust pipe line. It is also possible to exhaust (open) to the outside from the exhaust port 19A via 19. Further, the exhaust solenoid valve 20 has a function as a relief valve (safety valve) like the above-mentioned supply / exhaust valve 11.
  • the air conduit 10 is provided with a pressure detector 21 at a position between each branch pipe 10A and the supply / discharge switching valve 17, for example.
  • the pressure detector 21 closes all the supply / exhaust valves 11, the intake solenoid valve 14, and the exhaust solenoid valve 20, and returns the supply / exhaust switching valve 17 to the supply / exhaust position (g).
  • the valve 16 is switched from the valve closing position (e) to the valve opening position (f)
  • the pressure in the tank 12 is detected via the tank pipeline 15.
  • the pressure in the air chamber 1C of the corresponding air suspension 1 is increased. Can be detected by the pressure detector 21.
  • the pressure detector 21 constitutes a detecting means for estimating or calculating the pressure in the air suspension 1.
  • the controller 22 as a control means is configured by, for example, a microcomputer or the like.
  • a pressure detector 21, a plurality of vehicle height sensors 23 (that is, FL side, FR side, RL side, RR side vehicle height sensors 23), a selection switch 24, and the like are connected to the input side of the controller 22.
  • the vehicle height sensors 23 on the FL side, FR side, RL side, and RR side are air suspensions 1 on the left front wheel (FL), right front wheel (FR), left rear wheel (RL), and right rear wheel (RR) side of the vehicle.
  • the vehicle height is detected individually.
  • the selection switch 24 is an operation switch for switching, for example, an automatic mode for adjusting the vehicle height, or a selection mode in which the driver arbitrarily changes the vehicle height according to his / her preference.
  • the controller 22 is the FL side, FR side, RL side, RR side vehicle height sensor 23. Based on the vehicle height detection signal output from, it is compared (determined) whether each air suspension 1 is higher or lower than the set height that is the target vehicle height. On this basis, the controller 22 has each air suspension on the left front wheel (FL), right front wheel (FR), left rear wheel (RL), and right rear wheel (RR) side of the vehicle based on the comparison (judgment) result. Adjust the vehicle height according to 1 individually.
  • the output side of the controller 22 includes the electric motor 4 of the compressor 3, the air supply / exhaust valves 11 on the FL side, FR side, RL side, and RR side, the intake solenoid valve 14, the return solenoid valve 16, the supply / exhaust switching valve 17, and the exhaust. It is connected to the solenoid valve 20 and the like. Further, the controller 22 is connected to another controller (not shown) via, for example, CAN (Controller Area Network) which is a line network required for data communication. As a result, the controller 22 can input and output various vehicle information including load information such as vehicle speed, steering angle, outside air temperature (ambient temperature), date and time information, and load weight with other controllers. it can.
  • load information such as vehicle speed, steering angle, outside air temperature (ambient temperature), date and time information, and load weight with other controllers. it can.
  • the controller 22 has a memory 22A as a storage unit including a ROM, a RAM, a non-volatile memory, and the like.
  • a program for performing a control process for adjusting the vehicle height shown in FIG. 3 is stored. That is, the water adsorbent (desiccant) of the air dryer 7 cannot achieve its original function because the adsorbed water reaches a saturated state unless it is periodically regenerated.
  • the controller 22 stores the time, the number of times, etc. of the compressor 3 sucking in the outside air in the memory 22A.
  • the controller 22 periodically regenerates the air dryer 7 based on the stored contents, if necessary. This regeneration process is preferably performed when the vehicle is stopped so as not to cause discomfort or discomfort to the driver of the vehicle, for example.
  • the compressed air in the air suspension 1 air chamber 1C
  • the air dryer 7 is regenerated. I am trying to process it.
  • the controller 22 has a descent command unit 22B (see, for example, step 3 in FIGS. 2 and 3) that outputs a descent command for the vehicle height according to the traveling conditions of the vehicle or the vehicle height state. Then, when the lowering command is issued from the lowering command unit 22B, the controller 22 regenerates the air dryer 7 using the compressed air in the air suspension 1 (air chamber 1C).
  • the controller 22 controls the drive of the electric motor 4 based on the signals from each vehicle height sensor 23, the selection switch 24, and the like.
  • the controller 22 outputs a control signal to each supply / exhaust valve 11, intake solenoid valve 14, return solenoid valve 16, supply / exhaust switching valve 17, exhaust solenoid valve 20, and the like, and these valves 11, 14, 16, 17, 20. (Specifically, each solenoid) is individually excited or demagnetized. As a result, the air supply / exhaust valve 11 is switched to either the valve closing position (a) or the valve opening position (b) shown in the figure.
  • the intake solenoid valve 14, the return solenoid valve 16, the supply / exhaust switching valve 17, and the exhaust solenoid valve 20 are also switched to any position.
  • the air suspension device according to the first embodiment has the above-described configuration. Next, the vehicle height adjustment and the dryer regeneration control process by the controller 22 will be described with reference to FIG.
  • step 2 it is determined whether or not a vehicle height adjustment instruction (command) has been issued so that the vehicle height adjustment (auto leveling) is performed in the automatic mode by operating the selection switch 24.
  • step 2 it is determined in the next step 3 whether or not the "vehicle height adjustment instruction by auto-leveling” is a descending instruction (command).
  • step 3 it is determined in the next step 4, "vehicle height adjustment by auto-leveling” is performed according to the descending instruction (command), so that vehicle height adjustment by exhaust to the atmosphere is executed. That is, the controller 22 switches the air supply / exhaust valve 11 of the air suspension 1 from the valve closing position (a) to the valve opening position (b) to open the valve, and holds the supply / exhaust switching valve 17 at the supply / exhaust position (g). At the same time, the exhaust solenoid valve 20 is switched from the valve closing position (i) to the valve opening position (j). At this time, the electric motor 4 of the compressor 3 is driven and stopped so as to interrupt the compression operation.
  • the compressed air in the air suspension 1 flows back from each branch pipe 10A (air conduit 10) through the supply / exhaust switching valve 17 into the supply / exhaust pipe passage 6 and the air dryer 7, and further. It is discharged (opened) directly from the exhaust port 19A to the outside air via the exhaust pipe line 19 and the exhaust solenoid valve 20.
  • the slow return valve 8 provided in the middle of the supply / discharge pipe line 6 is in a state in which the check valve 8B is closed. Since the flow rate of the compressed air flowing (backflowing) through the slow return valve 8 is throttled by the throttle 8A, it slowly flows back in the air dryer 7 at a small flow rate.
  • the compressed air discharged from the air suspension 1 (air chamber 1C) at this time flows back in the air dryer 7 via the supply / exhaust pipe line 6. Therefore, the moisture adsorbent of the air dryer 7 is regenerated by passing the dry air of the air suspension 1, and the air dryer 7 can be efficiently regenerated. As a result, the vehicle height lowering speed when the air chamber 1C of the air suspension 1 is reduced to lower the vehicle height can be appropriately increased, and efficient regeneration processing of the air dryer 7 can be realized.
  • next step 5 it is determined whether or not the vehicle height has been lowered to the target vehicle height by the process of step 4. Specifically, by reading the detection signal (vehicle height value) from the vehicle height sensor 23, it is determined whether or not the detected vehicle height at this time has reached the set height (target vehicle height) in the automatic mode. To do. While the determination is "NO” in step 5, the process returns to step 4 and the subsequent processing is continued. Then, when it is determined as "YES” in step 5, the process of completing the vehicle height adjustment is performed in the next step 6.
  • step 6 the controller 22 returns the air supply / exhaust valve 11 of the air suspension 1 to the valve closing position (a) to close the valve, and the exhaust solenoid valve 20 is also closed at the valve closing position (i). And stop the discharge (exhaust) of compressed air from the exhaust port 19A.
  • step 2 when it is determined as "NO” in step 2, the case of the selection mode in which the driver arbitrarily changes the vehicle height according to his / her preference, for example, by operating the selection switch 24 instead of the "vehicle height adjustment instruction by auto-leveling". Is. Further, when "NO" is determined in step 3, the "vehicle height adjustment instruction by auto-leveling" is not a descending instruction (command) but, for example, an ascending command to raise the vehicle height.
  • step 7 "quick adjustment of the height of the compressor driven by the closed system” is executed. Specifically, when raising the vehicle height, the controller 22 switches the intake solenoid valve 14 from the valve closing position (c) to the valve opening position (d) to open the valve, and drives the compressor 3 by the electric motor 4.
  • the supply / exhaust switching valve 17 is held at the supply / exhaust position (g), and the supply / exhaust valve 11 of the air suspension 1 is switched from the valve closing position (a) to the valve opening position (b) to open the valve.
  • the compressed air in the tank 12 flows out to the tank side suction pipe line 13, and the pressure of the compressed air is boosted while being sucked from the intake side 3A as the compressor 3 operates. Then, the compressed air discharged from the discharge side 3B of the compressor 3 and boosted is supplied to the air chamber 1C of the air suspension 1 via the air dryer 7, the check valve 8B of the slow return valve 8, and the supply / discharge switching valve 17. As a result, the air suspension 1 can drive the vehicle height in the ascending direction. As described above, when the vehicle height rises, the air compressed by the compressor 3 is dried by passing through the air dryer 7, and the compressed air in the dried state is supplied into the air chamber 1C of the air suspension 1.
  • the controller 22 switches the air supply / exhaust valve 11 of the air suspension 1 from the valve closing position (a) to the valve opening position (b) to open the valve, and supplies / exhausts the supply / exhaust switching valve 17.
  • the position (g) is switched to the reflux position (h)
  • the compressor 3 is driven by the electric motor 4, and the return solenoid valve 16 is switched from the valve closing position (e) to the valve opening position (f).
  • the compressed air in the air suspension 1 (air chamber 1C) flows out from each branch pipe 10A (air conduit 10) to the recirculation pipe line 18 via the supply / discharge switching valve 17, and is accompanied by the operation of the compressor 3. While being sucked from the intake side 3A, the compressed air boosted from the discharge side 3B is discharged.
  • the compressed air discharged from the discharge side 3B of the compressor 3 is stored in the tank 12 via the air dryer 7, the check valve 8B of the slow return valve 8, the tank pipe line 15, and the return solenoid valve 16. Is filled with. That is, by forcibly supplying (filling) the compressed air in the air suspension 1 (air chamber 1C) toward the inside of the tank 12, the air chamber 1C of the air suspension 1 can be reduced and the vehicle height can be lowered. ..
  • step 8 it is determined whether or not the vehicle height has reached the target vehicle height by the process of step 7. Specifically, by reading the detection signal (vehicle height) from the vehicle height sensor 23, whether or not the detected vehicle height at this time reaches the set height (target vehicle height) in the selection mode or the automatic mode. Is determined. While the determination is "NO” in step 8, the process returns to step 7 and the subsequent processing is continued. Then, when it is determined as "YES” in step 8, the process proceeds to step 6 to complete the vehicle height adjustment.
  • the controller 22 returns the air supply / exhaust valve 11 of the air suspension 1 to the valve closing position (a) to close the valve, and the electric motor 4 stops the compressor 3 and stops the compressor 3.
  • the intake solenoid valve 14 is held in the closed position (c), and the supply / exhaust switching valve 17 is held in the supply / discharge position (g).
  • the control means (controller 22) for operating or opening / closing the 16 (second valve), the supply / exhaust switching valve 17, the exhaust solenoid valve 20 (third valve), etc. is a vehicle according to the traveling condition or the vehicle height state of the vehicle. It has a descent command unit 22B (for example, see step 3 in FIGS. 2 and 3) that outputs a high descent command, and when a descent command is output from the descent command unit 22B, it is inside the air suspension 1 (air chamber 1C).
  • the air dryer 7 is regenerated using the compressed air of the above.
  • the air dryer 7 when the vehicle height adjustment command by auto-leveling is a descending command, the air dryer 7 is regenerated to generate exhaust noise (exhaust noise emitted from the exhaust port 19A) and valves (for example, exhaust port 19A).
  • the air supply / exhaust valve 11 and the exhaust solenoid valve 20) can reduce discomfort and discomfort to the passenger (driver) due to noise during operation. Since the temperature sensor, humidity sensor, etc. used in the prior art can be eliminated, the air dryer 7 can be efficiently regenerated without increasing the number of sensors, and the reliability of the device can be improved. it can.
  • step 7 when it is determined as "NO" in step 2 of FIG. 3 and "the vehicle height is adjusted quickly by the compressor drive by the closed system” in the next step 7, the vehicle height is adjusted by the so-called manual operation by the selection switch 24. It can be done quickly and in a short time.
  • step 4 when adjusting the vehicle height (lowering) by auto-leveling in step 4, the compressed air in the air suspension 1 (air chamber 1C) is exhausted via the slow return valve 8 (aperture 8A) and the air dryer 7. As a result, a relaxed and natural vehicle height adjustment can be realized.
  • the treatment of steps 3 to 5 in FIG. 3 can create an opportunity to regenerate the air dryer 7, prevent deterioration of the dryer function due to moisture saturation of the water adsorbent, and efficiently carry out the regeneration treatment of the air dryer 7.
  • the reliability of the air suspension system can be improved.
  • the pressure of the compressed air filled in the air suspension 1 (air chamber 1C) is lower than the pressure of the compressed air filled (stored) in the tank 12, and is substantially constant. Therefore, it is effective to regenerate the air dryer 7 by using the compressed air exhausted from the air suspension 1 in order to improve the regeneration efficiency of the air dryer 7.
  • the air dryer 7 can be efficiently regenerated without increasing the number of sensors, and the reliability of the device can be improved. Further, by performing the regeneration process of the air dryer 7 based on the vehicle height (descent) adjustment command by auto-leveling, for example, based on the descent command when the vehicle is stopped, boarding due to the exhaust noise generated during the dryer regeneration and the noise during valve operation. It is possible to reduce discomfort and discomfort to the person.
  • the air suspension device supplies the compressor 3 for compressing air, the tank 12 configured to store air, and the compressed air in the tank 12 to the intake side 3A of the compressor 3.
  • the tank-side suction pipe line 13 first passage
  • the tank pipe line 15 second passage connecting the discharge side 3B of the compressor 3 and the tank 12, and the discharge side 3B of the compressor 3 via the air dryer 7.
  • the air suspension 1 to be connected, the first valve (intake solenoid valve 14) provided in the first passage (tank side suction pipeline 13), and the second valve provided in the second passage (tank pipeline 15).
  • An exhaust pipe that is branched from the valve (return solenoid valve 16) and the discharge side 3B of the compressor 3 and the air dryer 7, and is connected to the atmosphere by opening the exhaust solenoid valve 20 (third valve).
  • a road 19 (third passage) is provided, the first valve and the second valve are closed, and the third valve is opened to regenerate the air dryer 7 through the compressed air in the air suspension 1. It is possible.
  • the compressed air is aired by opening the exhaust solenoid valve 20 (third valve) with the intake solenoid valve 14 (first valve) and the return solenoid valve 16 (second valve) closed.
  • the air dryer 7 can be regenerated by exhausting air from the suspension 1 to the atmosphere. Then, when the pressure in the air suspension 1 is lower than the pressure in the tank 12, the air dryer 7 can be efficiently regenerated and the regeneration frequency can be reduced. This makes it possible to shorten the driving time of the compressor 3 in the dryer regeneration process.
  • the intake solenoid valve 14 (first valve), the return solenoid valve 16 (second valve), and the exhaust solenoid valve 20 (third valve) provided between the compressor 3 and the tank 12 are, for example, an on / off type general-purpose valve. It can be configured by using a highly efficient and inexpensive solenoid type switching valve (two-way solenoid valve). Therefore, for example, the system can be made at a lower cost than the conventional technique of Patent Document 1. That is, in the prior art, a three-way solenoid valve is used to connect the intake side and discharge side of the compressor to the tank.
  • the intake solenoid valve 14 and the return solenoid valve 16 including, for example, an on / off type two-way solenoid valve are interposed between the intake side 3A and the discharge side 3B of the compressor 3 and the tank 12. Is connected.
  • the intake solenoid valve 14 and the return solenoid valve 16 are closed (demagnetized state of the solenoid)
  • the tank 12 is shut off from the compressor 3 and the air suspension 1, so that the compression stored (accumulated) in the tank 12 is performed.
  • the risk of air leakage can be reliably reduced.
  • the number of times the outside air is compressed by the compressor 3 can be reduced, and as a result, the regeneration frequency of the air dryer 7 can be reduced.
  • the compressed air can be directly supplied to the air suspension 1 by sucking the outside air with the compressor 3, and the vehicle height can be adjusted. Therefore, when the tank pressure is higher than the atmospheric pressure, the air suspension 1 can be filled with extra compressed air by the outside air, and the air suspension 1 to the air dryer 7 can be immediately regenerated. This gives an opportunity to regenerate the air dryer 7. Can be created.
  • the compressed compressed air can be stored in the tank 12, and the compressed air stored in the tank 12 is further compressed by the compressor 3 while being further compressed by the compressor 3. It is possible to realize a closed circuit (closed system) that can be supplied to 1. Further, the compressed air discharged from the air chamber 1C of the air suspension 1 can be returned and stored in the tank 12 by using the return solenoid valve 16 without being released to the atmosphere, and the compressed air is wastedly exhausted. It can be used effectively without any problems.
  • the compressor 3 sucks and compresses the compressed air in the tank 12, the frequency of sucking air from the outside atmosphere (that is, the frequency of opening the intake valve 9) is significantly increased. It is possible to reduce the frequency of problems caused by inhaling dust and moisture in the air. Further, as compared with the conventional closed system type, it is not essential to perform pressure control or the like by using a pressure sensor or the like, and it is not necessary to perform complicated control, and the entire configuration can be simplified. ..
  • the air dryer 7 appropriately adsorbs and regenerates the water, so that the saturation of the water adsorbent can be prevented.
  • the controller 22 can provide a closed type system that does not require complicated control.
  • the vehicle height rise time at the time of high frequency use can be shortened. Then, only when the vehicle height adjustment range becomes larger than the normal use range, the atmosphere is taken in (the intake valve 9 is opened) or the compressed air is released into the atmosphere (exhaust solenoid valve 20) as needed. It can be opened).
  • the pressure in the air chamber 1C or the tank 12 is detected by using the pressure detector 21 as shown in FIG. 1 has been described as an example.
  • the present invention is not limited to this, and for example, the pressure in the air chamber 1C or the tank 12 may be estimated from the change in the vehicle height by using the detection signal of the vehicle height sensor 23.
  • the vehicle height sensor 23 serves as a detection means, and the pressure detector 21 can be eliminated.
  • FIG. 4 shows a second embodiment.
  • the feature of this embodiment is provided with a detecting means for estimating or calculating the pressure in the air suspension, and when the pressure detected by the detecting means exceeds a predetermined pressure, the compressed air in the air suspension is supplied to the tank to supply the compressed air in the predetermined pressure. When the pressure is lower than the pressure, the air dryer is regenerated by using the compressed air exhausted from the air suspension.
  • the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.
  • FIG. 4 shows the vehicle height adjustment and dryer regeneration control processing according to the second embodiment, and this program is stored in the memory 22A of the controller 22 shown in FIG. 2, for example.
  • determination processing is performed in the same manner as in steps 1 to 3 of FIG. 3 according to the first embodiment described above.
  • the air suspension pressure is lower than the predetermined pressure.
  • the pressure of the compressed air supplied to fill the air suspension 1 (air chamber 1C) can be detected by using the detection means (that is, the pressure detector 21).
  • the pressure in the air suspension 1 (air chamber 1C) is higher than the atmospheric pressure and lower than the predetermined pressure (pressure threshold value)
  • the compressed air exhausted from the air suspension 1 is used to regenerate the air dryer 7. It can be done efficiently.
  • the pressure in the air suspension 1 (air chamber 1C) is higher than the predetermined pressure (pressure threshold value)
  • the regeneration efficiency of the air dryer 7 is lowered.
  • the predetermined pressure is determined as a pressure threshold value (pressure higher than atmospheric pressure) for determining the quality of such dryer regeneration efficiency.
  • step 14 when it is determined as "YES” in step 14, the pressure in the air suspension 1 (air suspension pressure) is lower than the predetermined pressure, and the regeneration process of the air dryer 7 can be efficiently performed. Therefore, the next step 15 is performed. Then, in order to perform the process according to the descending instruction (command) of the "vehicle height adjustment by auto-leveling", the vehicle height adjustment by exhausting to the atmosphere is performed in the same manner as in step 4 of FIG. 3 according to the first embodiment. Further, the processes of steps 16 and 17 are also performed in the same manner as in steps 5 and 6 of FIG. As a result, the regeneration process of the air dryer 7 can be efficiently performed, and the deterioration of the dryer function due to the water saturation of the water adsorbent can be prevented.
  • step 12 or step 13 when it is determined as "NO" in step 12 or step 13, the same processing as in steps 7 and 8 of FIG. 3 according to the first embodiment is performed in the next steps 18 and 19. This makes it possible to quickly and quickly adjust the vehicle height by using a closed system to drive the compressor quickly. After that, the vehicle height adjustment completion process of step 17 is performed.
  • step 14 when "NO" is determined in step 14, the pressure in the air suspension 1 (air chamber 1C) is higher than the predetermined pressure, and the exhaust solenoid valve 20 is temporarily switched to the valve opening position (j). It can be judged that it is difficult to efficiently regenerate the air dryer 7 even if the air dryer 7 is exhausted. Therefore, moving to the next step 20, the controller 22 drives the compressor 3 by the electric motor 4 and executes the lowering adjustment of the vehicle height while accumulating the compressed air in the tank 12.
  • step 20 in order to adjust the lowering of the vehicle height, the controller 22 switches the air supply / exhaust valve 11 of the air suspension 1 from the valve closing position (a) to the valve opening position (b) to open the valve.
  • the supply / exhaust switching valve 17 is switched from the supply / discharge position (g) to the reflux position (h), the compressor 3 is driven by the electric motor 4, and the return solenoid valve 16 is moved from the valve closing position (e) to the valve opening position (f). Switch to.
  • the exhaust solenoid valve 20 is returned to the closed position (i).
  • the compressed air in the air suspension 1 flows out from each branch pipe 10A (air conduit 10) to the recirculation pipe line 18 via the supply / discharge switching valve 17, and is accompanied by the operation of the compressor 3. It is sucked from the intake side 3A, and compressed air is discharged from the discharge side 3B of the compressor 3. Then, this compressed air is filled into the tank 12 via the air dryer 7, the check valve 8B of the slow return valve 8, the tank pipe line 15, and the return solenoid valve 16. That is, by forcibly releasing the compressed air in the air suspension 1 (air chamber 1C) toward the tank 12, the air chamber 1C of the air suspension 1 can be reduced and the vehicle height can be lowered.
  • step 21 it is determined whether or not the vehicle height has been lowered to the target vehicle height by the process of the step 20. Specifically, it is determined whether or not the vehicle height detected by the vehicle height sensor 23 has reached the set height (target vehicle height). While the determination is "NO" in step 21, the process returns to step 14 and the subsequent processing is continued. That is, since the air suspension 1 exhausts compressed air from the air chamber 1C in the process of the step 20, it is determined in the step 14 whether or not the pressure in the air suspension 1 (air chamber 1C) is lower than the predetermined pressure. To do. Then, when it is determined as "YES" in step 14, the regenerating process of the air dryer 7 can be efficiently performed by the process of step 15.
  • step 14 when it is determined as "NO” in step 14, the processes of steps 20 and 21 are performed, and the compressed air in the air suspension 1 (air chamber 1C) is accumulated in the tank 12.
  • step 21 it is determined whether or not the vehicle height has been lowered to the target vehicle height by reducing the air chamber 1C of the air suspension 1. Then, when it is determined as "YES” in step 21, the process proceeds to step 17 to complete the vehicle height adjustment. That is, in step 17, the controller 22 returns the air supply / exhaust valve 11 of the air suspension 1 to the valve closing position (a) to close the valve, stops the drive of the compressor 3 by the electric motor 4, and the supply / exhaust switching valve 17. Is returned to the supply / discharge position (g), and the return solenoid valve 16 is returned to the valve closing position (e), thereby completing the vehicle height adjustment.
  • the air dryer 7 is regenerated, so that the exhaust noise generated during the dryer regeneration and the valve operation are performed. It is possible to reduce the discomfort and discomfort to the passengers due to the noise. Further, the air dryer 7 can be efficiently regenerated without increasing the number of sensors, and the reliability of the device can be improved.
  • the compressed air in the air suspension 1 when the compressed air in the air suspension 1 is exhausted in order to lower the vehicle height, when the pressure detected by the pressure detector 21 exceeds the predetermined pressure, the compressed air in the air suspension 1 is exhausted. Can be filled (supplied) so as to accumulate pressure in the tank 12 via the tank pipeline 15 and the return solenoid valve 16.
  • the air dryer 7 when the detected pressure is lower than the predetermined pressure, the air dryer 7 can be regenerated while discharging the compressed air in the air suspension 1 to the atmosphere, and the pressure lower than the predetermined pressure in the air suspension 1 (air suspension pressure) is applied. By utilizing this, the regeneration process of the air dryer 7 can be efficiently performed.
  • FIG. 5 shows a third embodiment.
  • the feature of this embodiment is that the dryer is regenerated at predetermined intervals when a descending command is issued from the descending command unit.
  • the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.
  • FIG. 5 shows the vehicle height adjustment and dryer regeneration control processing according to the third embodiment, and this program is stored in the memory 22A of the controller 22 shown in FIG. 2, for example.
  • the determination processing is performed in the same manner as in steps 1 to 3 of FIG. 3 according to the first embodiment described above.
  • step 34 it is determined in the next step 34 whether or not "regeneration of the dryer” is necessary.
  • the air dryer 7 can appropriately adsorb and regenerate the moisture, so that the moisture adsorbent Saturation can be prevented.
  • the air dryer 7 is regenerated during the period from the time of the previous descent command to the predetermined number of times (for example, the number of the 100th descent commands) of the vehicle height adjustment command (descent command) by auto-leveling. By doing so, saturation of the water adsorbent can be prevented.
  • step 34 it is determined whether or not the number of vehicle height descent commands by auto-leveling has reached a predetermined number of times since the previous descent command, and it is determined whether or not "regeneration of the dryer” is necessary. .. Further, it may be configured to determine whether or not "regeneration of the dryer” is necessary depending on whether or not a predetermined time (for example, 24 hours) has elapsed from the previous regeneration process.
  • a predetermined time for example, 24 hours
  • step 34 When it is determined as "YES” in step 34, it is a case where the air dryer 7 should be regenerated at a predetermined interval when the descending command unit 22B issues a descending command. Therefore, when it is determined as "YES” in step 34, the vehicle height is adjusted by exhausting to the atmosphere in order to move to the next step 35 and perform processing according to the descending instruction (command) of "vehicle height adjustment by auto-leveling". , The same as step 4 of FIG. 3 according to the first embodiment. Further, the processes of steps 36 and 37 are also performed in the same manner as in steps 5 and 6 of FIG. As a result, the regeneration process of the air dryer 7 can be efficiently performed, and the deterioration of the dryer function due to the water saturation of the water adsorbent can be prevented.
  • step 33 or step 34 the same processing as in steps 7 and 8 of FIG. 3 according to the first embodiment is performed in the next steps 38 and 39. This makes it possible to quickly and quickly adjust the vehicle height by using a closed system to drive the compressor quickly. After that, the vehicle height adjustment completion process of step 37 is performed.
  • the regeneration process of the air dryer 7 can be efficiently performed by utilizing the compressed air exhausted from the air suspension 1 as in the first embodiment. it can.
  • the air dryer 7 is regenerated at predetermined intervals when a descending command is issued from the descending command unit 22B.
  • the air dryer 7 By performing the regeneration process of the air dryer 7 only once a day (until 24 hours have passed from the previous regeneration process), the air dryer 7 appropriately adsorbs and regenerates the moisture, so that the moisture is adsorbed.
  • the saturation of the agent can be prevented, and the regeneration process of the air dryer 7 can be performed the minimum number of times necessary.
  • the regeneration process of the air dryer 7 is performed 1 during the period from the time of the previous descent command to the predetermined number of times (for example, the number of the 100th descent commands) of the vehicle height adjustment command (descent command) by auto-leveling. By repeating this process, saturation of the water adsorbent can be prevented, and the air dryer 7 can be effectively regenerated.
  • the pressure in the air chamber 1C or the tank 12 is detected by using the pressure detector 21 as shown in FIG. 1 has been described as an example.
  • the present invention is not limited to this, and for example, the pressure in the air chamber 1C or the tank 12 may be estimated from the change in the vehicle height by using the detection signal of the vehicle height sensor 23.
  • the vehicle height sensor 23 is the detection means, and the pressure detector 21 can be unnecessary. This point is the same for the first and second embodiments.
  • the tip end side of the exhaust pipe line 19 is connected to the intake pipe line (for example, between the intake valve 9 and the intake port 5B), and the intake port also serves as the exhaust port. It may be an exhaust port.
  • the air suspension device provided in the vehicle, the compressor that compresses the air, the tank configured to store the air, and the compressed air in the tank are described.
  • the first passage that supplies the suction side of the compressor, the second passage that connects the discharge side of the compressor and the tank, the air suspension that is connected to the discharge side of the compressor via an air dryer, and the first passage.
  • a first valve provided, a second valve provided in the second passage, a branch provided from between the discharge side of the compressor and the air dryer, and connected to the atmosphere by opening the third valve.
  • the third passage and the control means for opening and closing the first valve, the second valve and the third valve are provided, and the control means gives a lower command according to the traveling condition or the vehicle height state of the vehicle. It is characterized in that the air dryer is regenerated by using the compressed air in the air suspension when a lowering command is issued from the lowering command unit.
  • the detection means for estimating or calculating the pressure in the air suspension is provided, and when the detection pressure by the detection means exceeds a predetermined pressure, the pressure in the air suspension is increased.
  • the compressed air is supplied to the tank, and when the pressure is lower than the predetermined pressure, the air dryer is regenerated.
  • the air dryer is regenerated at the time of the lowering command when the vehicle is stopped.
  • the air dryer is regenerated at predetermined intervals when a descending command is received from the descending command unit. ..
  • Air suspension Compressor device 3 Compressor 4 Electric motor 5 Intake line 6 Supply / exhaust line 7 Air dryer 8 Slow return valve 9 Intake valve 10 Air conduit 11 Supply / exhaust valve 12 Tank 13 Tank side suction line (first passage) 14 Intake solenoid valve (first valve) 15 Tank pipeline (second passage) 16 Return solenoid valve (second valve) 17 Supply / exhaust switching valve 18 Reflux line 19 Exhaust line (third passage) 20 Exhaust solenoid valve (3rd valve) 21 Pressure detector (detection means) 22 Controller (control means) 22B Down command unit 23 Vehicle height sensor 24 Selection switch

Abstract

Dispositif de commande (22) commandant le fonctionnement ou l'ouverture et la fermeture, par exemple : d'un moteur électrique (4) d'un compresseur (3) ; de soupapes d'alimentation/échappement (11) sur les côtés FL, FR, RL et RR ; d'une électrovanne d'entrée (14) ; d'une électrovanne de retour (16) ; d'une soupape de commutation d'alimentation/échappement (17) ; et d'une électrovanne d'échappement (20). Le dispositif de commande (22) comporte une unité d'instruction d'abaissement (22B) pour délivrer en sortie une instruction d'abaissement de hauteur de véhicule conformément à une condition de conduite ou à un état de hauteur de véhicule d'un véhicule. Lorsque l'instruction d'abaissement a été émise par l'unité d'instruction d'abaissement (22B), le dispositif de commande (22) amène l'électrovanne d'échappement (20) à s'ouvrir et réalise ainsi un traitement de régénération pour un dessiccateur d'air (7) à l'aide d'air comprimé dans des suspensions pneumatiques (1).
PCT/JP2019/049625 2019-03-27 2019-12-18 Dispositif de suspension pneumatique WO2020194926A1 (fr)

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JP2019-060496 2019-03-27
JP2019060496 2019-03-27

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19620851A1 (de) * 1996-05-23 1997-12-04 Knorr Bremse Systeme Luftaufbereitungsanordnung für Druckluft, insbesondere für pneumatische Bremsanlagen von Kraftfahrzeugen
JPH11278032A (ja) * 1998-03-26 1999-10-12 Toyota Motor Corp 車高調整装置
JP2002087040A (ja) * 2000-09-20 2002-03-26 Aisin Seiki Co Ltd 空気圧車高調整装置
JP2006224869A (ja) * 2005-02-18 2006-08-31 Toyota Motor Corp エアサスペンション装置
JP2012087742A (ja) * 2010-10-21 2012-05-10 Mitsubishi Fuso Truck & Bus Corp エアドライヤ保護装置
JP2015105020A (ja) * 2013-11-29 2015-06-08 日立オートモティブシステムズ株式会社 エアサスペンションシステム

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19620851A1 (de) * 1996-05-23 1997-12-04 Knorr Bremse Systeme Luftaufbereitungsanordnung für Druckluft, insbesondere für pneumatische Bremsanlagen von Kraftfahrzeugen
JPH11278032A (ja) * 1998-03-26 1999-10-12 Toyota Motor Corp 車高調整装置
JP2002087040A (ja) * 2000-09-20 2002-03-26 Aisin Seiki Co Ltd 空気圧車高調整装置
JP2006224869A (ja) * 2005-02-18 2006-08-31 Toyota Motor Corp エアサスペンション装置
JP2012087742A (ja) * 2010-10-21 2012-05-10 Mitsubishi Fuso Truck & Bus Corp エアドライヤ保護装置
JP2015105020A (ja) * 2013-11-29 2015-06-08 日立オートモティブシステムズ株式会社 エアサスペンションシステム

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