KR20140055642A - Controll method for air suspension system of vehicle - Google Patents

Controll method for air suspension system of vehicle Download PDF

Info

Publication number
KR20140055642A
KR20140055642A KR1020120122781A KR20120122781A KR20140055642A KR 20140055642 A KR20140055642 A KR 20140055642A KR 1020120122781 A KR1020120122781 A KR 1020120122781A KR 20120122781 A KR20120122781 A KR 20120122781A KR 20140055642 A KR20140055642 A KR 20140055642A
Authority
KR
South Korea
Prior art keywords
compressor
air
valve
air spring
vehicle
Prior art date
Application number
KR1020120122781A
Other languages
Korean (ko)
Inventor
김영일
Original Assignee
현대모비스 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대모비스 주식회사 filed Critical 현대모비스 주식회사
Priority to KR1020120122781A priority Critical patent/KR20140055642A/en
Publication of KR20140055642A publication Critical patent/KR20140055642A/en

Links

Images

Classifications

    • 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
    • B60G17/018—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 characterised by the use of a specific signal treatment or control method
    • 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
    • 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
    • B60G17/0523—Regulating distributors or valves for pneumatic springs
    • 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
    • B60G17/056—Regulating distributors or valves for hydropneumatic systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/15—Fluid spring
    • B60G2202/152—Pneumatic spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/20—Spring action or springs
    • B60G2500/205—Air-compressor operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2600/00—Indexing codes relating to particular elements, systems or processes used on suspension systems or suspension control systems
    • B60G2600/44—Vibration noise suppression
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00—Other features of vehicle sub-units
    • B60Y2306/09—Reducing noise

Abstract

According to an embodiment of the present invention, the invention comprises a step of: (a) determining whether or not an air thank is filled by a compressor; (b) closing a reservoir valve when the air tank is filled and opening an air spring valve while the compressor is operated; (c) closing the air spring valve and opening an exhaust valve while the compressor is operated; and (d) stopping the compressor while the exhaust valve is opened.

Description

TECHNICAL FIELD [0001] The present invention relates to a control method for an air suspension system for a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a control method of an air suspension system for a vehicle, and more particularly, to a control method of a vehicle air suspension system capable of reducing exhaust noise.

Generally, a suspension of a vehicle is provided in a vehicle so as to absorb shock from the road surface and improve ride stability, driving stability, turning characteristics, and the like. An air suspension system used as a type of suspension for a vehicle is a suspension system using an air spring. Since an air spring utilizing the elasticity of compressed air is used, flexible elasticity can be obtained while absorbing minute vibrations, By controlling the compressed air pressure, the vehicle height can be maintained constant regardless of the load. In response to the recent upgrading of the vehicle, the air suspension system for a vehicle as described above is applied to various types of vehicles such as leisure vehicles, and the use thereof is rapidly increasing.

On the other hand, the air suspension system for a vehicle is composed of an air spring mounted on each corner of the vehicle, an air tank for supplying compressed air to the air spring, and a compressor. The solenoid valve, various sensors, ECU (Electronic Control Unit) The discharge of compressed air is controlled to perform suspension function and garage control. Such an air suspension system for a vehicle has been conventionally known, and various improvements and improvements have been actively researched and developed. For example, Japanese Laid-Open Patent Publication No. 10-2011-0075828 proposes an air suspension system capable of improving the cooling efficiency of an air compressor. In Japanese Patent Application Laid-Open No. 10-2011-001326, a stable garage control There is a suggestion on how.

The air suspension system for a vehicle as described above calculates the height difference between the target height and the current height from the signal value of the height sensor and controls the ECU or the like to adjust the discharge of compressed air to converge to the target height . That is, when the current garage is lower than the target garage, for example, the compressed air is supplied to the air spring to control the garage upward, and the compressed air as described above can be supplied through the compressed air or the compressed air stored in the air tank. Generally, the above-described garage up-direction control may be advantageous in terms of control response and noise in the control of the air tank through the compressed air rather than the control through the compressor.

Meanwhile, in the air suspension system for a vehicle as described above, the compressor generates compressed air for adjusting the air amount of the air spring and supplies it to an air tank or an air spring. At this time, since the required pressure is high, After filling or the like is completed, a high pressure residual pressure is present in the compressor. Generally, the residual pressure in the compressor is discharged to the outside air through an exhaust valve or the like. At this time, a large pressure difference occurs between the pressure inside the compressor and the pressure of the outside air. In this case, Exhaust noise and vibration are largely generated.

Japanese Patent Application Laid-Open No. 10-2011-0075828 (published on Jul. 06, 2011) Japanese Patent Application Laid-Open No. 10-2011-0011326 (published on February 08, 2011)

Embodiments of the present invention are intended to provide a control method of a vehicle air suspension system capable of reducing exhaust noise generated when a residual pressure of a compressor is removed.

According to an aspect of the present invention, there is provided a method of controlling an internal combustion engine, the method comprising: (a) determining whether the filling of the air tank by the compressor has ended; (b) closing the reservoir valve between the compressor and the air tank when the filling of the air tank is completed, and opening the air spring valve between the compressor and the air spring in a state in which the compressor is driven; (c) closing the air spring valve and opening an exhaust valve for communicating an internal circuit of the compressor with outside air in a state in which the compressor is driven; And (d) stopping driving the compressor when the exhaust valve is opened. A method of controlling an air suspension system for a vehicle, comprising the steps of:

The control method of the vehicle air suspension system according to the embodiments of the present invention releases the residual pressure to the outside air by opening the exhaust valve in a state in which the residual pressure in the compressor is partially discharged by the air spring to lower the internal pressure of the compressor, It is possible to relatively reduce the pressure difference between the internal pressure of the compressor and the outside air, thereby reducing the noise vibrations generated during the exhaust as compared with the prior art.

1 is a control flowchart showing a control method of an air suspension system for a vehicle according to an embodiment of the present invention.
2 is a control signal diagram illustrating a control method of an air suspension system for a vehicle according to an embodiment of the present invention.

Hereinafter, a method of controlling an air suspension system for a vehicle according to an embodiment of the present invention will be described with reference to the drawings.

1 is a control flowchart showing a control method of an air suspension system for a vehicle according to an embodiment of the present invention.

Prior to describing FIG. 1, the air suspension system for a vehicle will be schematically described. The air suspension system for a vehicle includes an air spring for implementing a vehicle height adjustment and a suspension function, a compressed air An air tank for storing air, an air supply for the air spring, and a compressor for air filling the air tank. The air spring, the air tank, the compressor, and the like may be connected by a pneumatic line and various valves disposed thereon.

For convenience of explanation, hereinafter, a valve for communicating the internal circuit of the compressor with the outside air is referred to as an exhaust valve for removing residual pressure of the compressor, etc., and a valve for opening and closing a pneumatic line between the compressor and the air spring Will be referred to as a spring valve. The valve for opening and closing the pneumatic line between the compressor and the air tank will be referred to as a reservoir valve.

Referring to FIG. 1, a method of controlling an air suspension system for a vehicle according to an embodiment of the present invention includes the steps of: (a) determining whether the filling of an air tank by a compressor has ended; (b) closing the reservoir valve between the compressor and the air tank when the filling of the air tank is completed, and opening the air spring valve between the compressor and the air spring in a state in which the compressor is driven; (c) closing the air spring valve and opening an exhaust valve that communicates the internal circuit of the compressor with ambient air in a state in which the compressor is driven; And (d) stopping the compressor when the exhaust valve is opened.

In the step (a), it is confirmed whether or not the filling control of the air tank by the compressor is completed. In other words, the control method according to the present embodiment can be started when the compressor finishes filling the air tank with compressed air. Therefore, in the control method according to the present embodiment, when compressed air is filled in the air tank by using a compressor due to insufficient compressed air in the air tank during control of the air suspension system for a vehicle, or when the compressor is used for garage lift control .

In the step (b), the air spring valve is opened to allow the internal residual pressure of the compressor to be discharged to a part of the air spring. When filling of the air tank is completed or stopped, the compressor is stopped. At this time, it is necessary to discharge the internal residual pressure of the compressor before stopping the operation of the compressor. Normally, the internal pressure of the compressor is discharged through an exhaust valve that communicates the internal circuit of the compressor and the outside air. When the exhaust valve is opened in the state where the high pressure residual pressure is present in the compressor, Thereby generating noise or vibration during exhaust.

The control method according to the present embodiment may be configured to discharge a part of the internal residual pressure of the compressor to the air spring in order to reduce noise or vibration due to the pressure difference as described above. That is, the control method according to the present embodiment opens the air spring valve to discharge the internal residual pressure of the compressor to a part of the air spring before opening the exhaust valve and discharging the internal residual pressure of the compressor to the outside air. In this case, before the exhaust valve is opened, the internal pressure of the compressor is lowered to a predetermined degree, and the exhaust noise due to the pressure difference with the outside air can be reduced. This will be further described with reference to steps (c) and (d) to be described later.

On the other hand, if the internal residual pressure of the compressor is excessively discharged by the air spring, it may affect the operation of the air spring (for example, excessive air may be supplied to the air spring to cause excessive change in the garage) , The opening time of the air spring valve can be maintained for a predetermined time so as not to have too much influence on the operation of the air spring. In other words, the step (b) may be maintained for a predetermined time (for example, one second). In this case, only a part of the residual pressure inside the compressor is discharged to the air spring, and the internal pressure of the compressor can be lowered without operating the air spring or significantly changing the garage.

In addition, the control method according to the present embodiment starts at the time when the filling of the compressed air into the air tank is finished. In the step (b), the reservoir valve between the compressor and the air tank is closed, The spring valve can be opened simultaneously with the closing of the reservoir valve. In other words, when filling of the air tank is completed, the air spring valve is opened together with the closing of the reservoir valve, so that discharge of the residual pressure in the compressor is started.

On the other hand, in the step (c), the air spring valve is closed and the exhaust valve is opened. In other words, in the step (c), the discharge of the residual pressure of the compressor through the air spring is stopped, and the exhaust valve is opened, so that the residual pressure in the compressor is discharged to the outside air. At this time, the compressor is still being driven, and as will be described later, the compressor is sequentially stopped in step (d).

In the step (c), the exhaust valve may be opened simultaneously with the closing of the air spring valve. In other words, when the air spring valve is opened for a predetermined time and the internal residual pressure of the compressor is partially discharged through the air spring, the air spring valve is closed and at the same time the exhaust valve communicating with the outside air is opened. And is discharged to the outside air through the exhaust valve.

At this time, the step (c) may be performed sequentially after the step (b) is maintained for a predetermined time. In other words, the control method according to the present embodiment is changed to the step (c) after the step (b) is maintained for a predetermined time. This is to allow residual pressure discharge to the outside air through the step (c) after the internal residual pressure of the compressor is partially discharged through the step (b). As described above, the residual pressure is discharged to the air spring in the step (b), and the internal pressure of the compressor after the step (b) is lowered to a predetermined degree. Therefore, in the step (c) The difference becomes smaller. That is, even if the exhaust valve is opened in the step (c) and the residual pressure is discharged to the outside air, the pressure difference between the compressor internal pressure and the outside air is relatively reduced, so that noise and vibration generated during exhausting are remarkably reduced.

Meanwhile, the step (c) may be maintained for a predetermined time as in the step (b). That is, the step (c) may be maintained for a predetermined time (for example, one second). In this case, in the step (c), the residual pressure is discharged to the outside air through the exhaust valve for a predetermined time in a state in which the compressor is driven.

In the step (d), when the exhaust valve is opened, the driving of the compressor is stopped. This is to reduce the noise vibration when the valve is opened and closed and the driving control of the compressor is sequentially performed to suddenly stop the operation of the compressor and control the opening and closing of the valve.

Also, the step (d) may be sequentially performed after the step (c) is maintained for a predetermined period of time. In other words, the control method according to the present embodiment can be switched to the step (d) after the step (c) is maintained for a predetermined time. In the step (d), the residual pressure is discharged to the outside air through the exhaust valve following the step (c).

On the other hand, if all the residual pressure in the compressor is exhausted through the step (d), the exhaust valve is closed again and the control method according to the present embodiment is ended. When the control method according to the present embodiment is completed, the control is returned to the basic control logic of the air suspension system for the vehicle and the control according to the control is performed.

2 is a control signal diagram illustrating a control method of an air suspension system for a vehicle according to an embodiment of the present invention.

Referring to Fig. 2, the control method according to the present embodiment is characterized in that, after completion of filling of the air tank, the residual pressure discharge through the air spring (see the section (b) (C) of FIG. 2), the driving stop of the compressor and the discharge of the residual pressure (see the section (d) of FIG. 2) are sequentially performed. In other words, after the filling of the air tank is completed, the above-mentioned steps (b) to (d) are sequentially performed, and as described above, each step is maintained for a predetermined time.

Therefore, the opening and closing control of each valve and the discharge of the residual pressure in the compressor are sequentially performed after the end of filling of the air tank and the stoppage of the operation of the compressor, so that the noise vibration during overflow or exhaust in the apparatus can be reduced. Particularly, in the control method according to the present embodiment, the residual pressure in the compressor is discharged to the outside air by opening the exhaust valve while discharging the residual pressure in the compressor to the air spring to lower the internal pressure of the compressor. The pressure difference between the outside air and the outside air can be relatively reduced, thereby reducing the noise vibration generated during exhausting compared with the conventional art.

Furthermore, the control method according to the present embodiment can reduce the exhaust noise only by changing the control signal or the control method, while using the existing air suspension system for the vehicle as it is. As a result, It can be used for vehicle type, and it is said that it has excellent technical compatibility. Also, since the device configuration is not followed, the cost required for commercialization and realization is small, and the economical efficiency is also excellent.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention as set forth in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

Claims (7)

(a) determining whether the filling of the air tank by the compressor has ended;
(b) closing the reservoir valve when the filling of the air tank is completed, and opening the air spring valve in a state in which the compressor is driven;
(c) closing the air spring valve and opening the exhaust valve in a state in which the compressor is driven; And
(d) stopping the compressor when the exhaust valve is opened. The method according to claim 1,
Wherein the step (b) includes the step of lowering the internal residual pressure of the compressor to a predetermined level by discharging the internal residual pressure of the compressor to a part of the air spring. The method according to claim 1,
Wherein the step (b) opens the air spring valve simultaneously with the closing of the reservoir valve. The method according to claim 1,
Wherein the step (b) is continued for a predetermined time, and then the step (c) is switched to the step (c). The method according to claim 1,
Wherein the step (c) opens the exhaust valve at the same time as closing of the air spring valve. The method according to claim 1,
Wherein the step (c) is continued for a preset time, and then the step (d) is switched to the step (d). The method according to claim 1,
Wherein the steps (b) to (d) are sequentially performed after being maintained for a preset time, respectively.
KR1020120122781A 2012-11-01 2012-11-01 Controll method for air suspension system of vehicle KR20140055642A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120122781A KR20140055642A (en) 2012-11-01 2012-11-01 Controll method for air suspension system of vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120122781A KR20140055642A (en) 2012-11-01 2012-11-01 Controll method for air suspension system of vehicle

Publications (1)

Publication Number Publication Date
KR20140055642A true KR20140055642A (en) 2014-05-09

Family

ID=50887256

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020120122781A KR20140055642A (en) 2012-11-01 2012-11-01 Controll method for air suspension system of vehicle

Country Status (1)

Country Link
KR (1) KR20140055642A (en)

Similar Documents

Publication Publication Date Title
US9758007B2 (en) Vehicle height adjustment apparatus
EP1484204B1 (en) Vehicle height adjustment system
JP6114376B2 (en) Pressure medium supply facility, pneumatic system and method for operation of pressure medium supply facility
US8078377B2 (en) Compressed air supply system and method for determining system parameters
KR102001706B1 (en) Compressed air supply system, pneumatic system and method for operating a compressed air supply system and/or a pneumatic system
CN107444049B (en) Pressure source device and vehicle height control system
US20040188970A1 (en) Vehicle air-suspension system and method of operation
JP2014065387A (en) Automotive level adjuster of motorcycle
CN101353991A (en) Fuel injection control apparatus
JP2009002515A (en) Piston cylinder assembly
KR20160117894A (en) Device and method for controlling air suspension system
KR20140055642A (en) Controll method for air suspension system of vehicle
KR20090058568A (en) Method for controlling and/or regulating the level of a vehicle body of a motor vehicle
JP4442556B2 (en) Vehicle height adjusting device and hydraulic pressure source control device
JP2008184131A (en) In-vehicle compression equipment and its control method
JP4620727B2 (en) Method for adjusting the height of an air spring suspension vehicle
JP2007502742A (en) Device in vehicle with air suspension
JP2022157646A (en) Suspension system and vehicle height adjustable vehicle
JP2021133875A (en) Damping device for railroad vehicle
KR101806927B1 (en) Method for controlling compressor of air suspension system
JP5989217B2 (en) Automobile air suspension device and control method of auto air suspension device
JP2007099096A (en) Vehicle control device
JP4793213B2 (en) Hydraulic suspension system
KR102479164B1 (en) MR fluid automatic filler for MR dampers
JP4404783B2 (en) Vehicle height adjustment device

Legal Events

Date Code Title Description
WITN Withdrawal due to no request for examination