JP5228820B2 - Air cleaner device - Google Patents

Description

  The present invention relates to an air cleaner device, and more particularly to an air cleaner device capable of preventing fuel vapor leaking through an outlet duct from diffusing into the outside air.

  While an internal combustion engine mounted on a vehicle such as an automobile is stopped, HC (hydrocarbon) that is fuel vapor is generated in the intake pipe due to various causes. For example, if the fuel supplied to the cylinder combustion chamber during operation of the internal combustion engine stays and evaporates in the cylinder without being combusted together with the stop of the internal combustion engine, the cylinder intake valve is opened while the internal combustion engine is stopped. HC flows into the intake pipe, and the intake pipe is filled with HC.

  Further, if the fuel adhered to the intake port wall surface remains in a liquid state during operation of the internal combustion engine, the wall surface adhered fuel evaporates while the internal combustion engine is stopped, and HC is formed in the intake pipe. Further, in an internal combustion engine having a fuel injection valve, the fuel staying in the fuel injection valve when the internal combustion engine is stopped may slightly leak into the intake pipe and form HC in the intake pipe.

  As described above, when HC is generated in the intake pipe while the internal combustion engine is stopped, the generated HC fills the intake pipe, and further leaks into the atmosphere from the air cleaner device upstream of the intake pipe. There is a case where the so-called intake system evaporation leak may occur, and thus it is necessary to prevent the intake system evaporation leak.

  2. Description of the Related Art Conventionally, in order to prevent intake system evaporation leakage, a housing having an inlet duct for sucking outside air and an outlet duct for supplying outside air to an internal combustion engine and having a filter element for purifying air sucked from the inlet duct And an HC adsorption filter that is provided in the casing so as to be located downstream of the filter element in the flow direction of the intake air and that adsorbs HC flowing into the casing through the intake pipe on the downstream side of the outlet duct. An air cleaner device is known (see, for example, Patent Document 1).

  This air cleaner device is installed between the inner peripheral side surface of the housing and the other inner peripheral side surface so that the HC adsorption filter covers the entire surface of the filter element. When HC is generated, the HC is adsorbed by the HC adsorption filter, thereby preventing the air cleaner device from leaking to the atmosphere and the occurrence of intake system evaporation leakage.

  However, in this air cleaner device, the HC adsorption filter is installed between the inner peripheral side surface and the inner peripheral other side surface so as to cover the entire surface of the filter element. There is a possibility that the pressure loss increases due to the intake air passing through the HC adsorption filter.

  An air cleaner device shown in FIG. 7 is known as one that can eliminate such a problem (see, for example, Patent Document 2). An air cleaner device 1 shown in FIG. 7 has an inlet duct 2 for sucking air and an outlet duct 3 for supplying the sucked air to the internal combustion engine, and also includes a filter element 4 for purifying the air sucked from the inlet duct 2. And a HC adsorption filter 6 built in the housing 5.

  The HC adsorption filter 6 is formed in a sheet shape composed of, for example, an adsorbent that adsorbs hydrocarbons, for example, an adsorbent such as activated carbon, and a case having air permeability that sandwiches the adsorbent from both sides. Centering on a fulcrum part 7 provided on the actuator 8, the actuator 8 is supported so as to be rotatable.

  The cross-sectional shape of the HC adsorption filter 6 is the same as the inner cross-section of the housing 5, and extends from the upper wall surface (inner peripheral side surface) 5 a to the lower wall surface (inner peripheral other side surface) 5 b. Thus, the entrance duct 2 and the exit duct 3 are separated from each other.

  Further, a storage recess 5c is formed in the upper wall surface 5a of the housing 5, and when the HC adsorption filter 6 is rotated counterclockwise around the fulcrum portion 7 in the storage recess 5c, a virtual line As shown by, the HC adsorption filter 6 is stored.

  In the air cleaner apparatus 1, when the HC adsorption filter 6 is stored in the storage recess 5c as indicated by a broken line during operation of the internal combustion engine, the HC adsorption filter 6 does not become an intake resistance, and the pressure of the intake air It is possible to prevent the loss from increasing.

Further, when the internal combustion engine is stopped, the HC adsorption filter 6 extends from the upper wall surface 5a to the lower wall surface 5b of the housing 5 as shown by the solid line, so that the entrance duct 2 and the exit duct 3 are separated from each other. Therefore, the HC evaporated from the internal combustion engine side and flowing into the housing 5 through the outlet duct 3 can be reliably captured by the HC adsorption filter 6, and the HC leaks from the inlet duct 2 to the atmosphere. Can be prevented.
JP-A-2005-207345 Japanese Patent Laid-Open No. 2006-37865

  However, in such a conventional air cleaner device 1, the HC adsorption filter 6 having an adsorbent such as activated carbon extends from the upper wall surface 5 a to the lower wall surface 5 b of the housing 5, and the HC adsorption filter 6. Therefore, there is a problem that the structure is complicated and the HC adsorption filter 6 is increased in size and the manufacturing cost of the HC adsorption filter 6 is increased.

  The present invention has been made in order to solve the above-described conventional problems, and it is possible to reduce the size and simplification of the adsorption filter and prevent the production cost of the adsorption filter while preventing the pressure loss of the intake air. It is an object of the present invention to provide an air cleaner device that can prevent this from occurring.

  In order to achieve the above object, an air cleaner apparatus according to the present invention has (1) an inlet duct that sucks air from the outside and an outlet duct that supplies the sucked air to the internal combustion engine, and is sucked from the inlet duct. A housing containing a filter element for purifying air, and fuel vapor provided in the housing so as to be located downstream of the filter element in the flow direction of intake air and flowing into the housing through the outlet duct An adsorbing filter that adsorbs the adsorbing filter, the adsorbing filter protrudes from one inner peripheral side surface of the casing toward the other inner peripheral side surface, and air sucked into the casing from the inlet duct is introduced into the casing. An air cleaner device configured to flow out from the outlet duct through the other inner side surface of the body, provided in the inlet duct An on-off valve that opens and closes the inlet duct, an operating state detecting unit that detects an operating state of the internal combustion engine, and a stop state of the internal combustion engine that is detected based on detection information from the operating state detecting unit And an on-off valve control means for closing the on-off valve.

With this configuration, the adsorption filter protrudes from the inner peripheral side surface of the casing toward the inner peripheral other side surface, and the air that is sucked into the casing from the inlet duct passes between the adsorption filter and the inner peripheral other side surface of the casing. Since the open / close valve provided in the inlet duct is closed when the internal combustion engine is stopped, the fuel vapor is discharged from the outlet duct into the housing while the internal combustion engine is stopped. It is possible to suppress leakage from the entrance duct to the atmosphere by being confined in the body.
For this reason, it is possible to prevent the adsorption filter from being minimised and to prevent the configuration from becoming complicated, and to prevent the production cost of the adsorption filter from increasing.

  Further, since the adsorption filter can be minimized, it is possible to suppress the adsorption filter from becoming an intake resistance when the on-off valve is opened during operation of the internal combustion engine, thereby reducing the pressure loss of the intake air. be able to.

  Further, in the air cleaner device according to (1) above, (2) the inlet duct is constituted by a first inlet duct and a second inlet duct having the on-off valve, and the on-off valve control means is configured to perform the operation. When the state during operation of the internal combustion engine is detected based on detection information from the state detection means, the on-off valve is controlled to open and close according to the state during operation of the internal combustion engine.

  With this configuration, the first inlet duct is always opened, and the on-off valve provided in the second intake duct is opened and closed according to the operating state of the internal combustion engine. In the region, the second inlet duct is closed and outside air is sucked into the air cleaner only from the first inlet duct, thereby increasing the flow rate of the intake air and improving the output of the internal combustion engine. By opening the second inlet duct and allowing the air cleaner to suck air from the first inlet duct and the second inlet duct, the amount of intake air can be increased and the output of the internal combustion engine can be improved.

In the present invention, since the on-off valve provided in the second inlet duct is closed while the internal combustion engine is stopped, when fuel vapor flows from the outlet duct into the housing while the internal combustion engine is stopped. It is possible to prevent the fuel vapor from being trapped in the casing and leaking from the inlet duct to the atmosphere.
For this reason, it is possible to prevent the adsorption filter from being minimised and to prevent the configuration from becoming complicated, and to prevent the production cost of the adsorption filter from increasing.

  Further, since the adsorption filter can be minimized, the adsorption filter can be prevented from becoming an intake resistance during operation of the internal combustion engine, and the pressure loss of the intake air can be reduced.

  Further, in the air cleaner device according to (2) above, (3) the adsorption filter is configured to be provided at a position facing the first inlet duct via the filter element.

  With this configuration, since the adsorption filter is provided at a position facing the first inlet duct that is always open via the filter element, the fuel vapor that has flowed into the housing through the outlet duct is actively adsorbed by the adsorption filter. Thus, it is possible to make it difficult to flow into the first inlet duct.

  For this reason, it is possible to suppress the fuel vapor from flowing into the first inlet duct, and as a result, it is possible to suppress the fuel vapor from being trapped in the casing and leaking from the inlet duct to the atmosphere. .

  According to the present invention, it is possible to provide an air cleaner device capable of preventing an increase in manufacturing cost of an adsorption filter by reducing the size and simplification of the adsorption filter while preventing pressure loss of intake air. it can.

Hereinafter, embodiments of an air cleaner device according to the present invention will be described with reference to the drawings.
(First embodiment)
1-3 is a figure which shows 1st Embodiment of the air cleaner apparatus which concerns on this invention.
First, the configuration will be described.
1 and 2, the intake device 11 includes an air cleaner device 12, a throttle body 13, and an intake manifold 14, and intake air is supplied to an engine 16 as an internal combustion engine by the air cleaner device 12, the throttle body 13, and the intake manifold 14. An intake passage for supplying the air is formed.

  The air cleaner device 12 includes a casing 17, and the casing 17 has an inlet duct 18 that sucks air into the casing 17 from the outside and an outlet that supplies air sucked into the casing 17 to the engine 16. A duct 19 is provided, and the outlet duct 19 is connected to the throttle body 13.

  In addition, a filter element 20 is built in the housing 17, and the filter element 20 is made of, for example, a filtering material such as filter paper, and the like such as dust contained in the air sucked from the inlet duct 18. By capturing foreign matter, the intake air is purified.

  A butterfly throttle valve 21 is provided inside the throttle body 13, and the throttle valve 21 is an intake that is supplied to the engine 16 by changing the opening degree based on the operation of an accelerator pedal (not shown). The amount of air is adjusted.

  The intake manifold 14 includes a cylindrical surge tank 15a extending in the lateral direction of the engine 16, and a throttle body 13 is attached to the upstream side of the surge tank 15a in the flow direction of intake air.

  The surge tank 15 a is provided with a branch pipe portion 15 b, and the branch pipe portion 15 b is communicated with each cylinder 23 of the engine 16 via each intake port 22 of the engine 16. The cylinder 23 is provided with a piston 24, and the intake air is compressed when the piston 24 moves up in the cylinder 23.

  In the case of a four-cylinder engine, four branch pipe portions 15b are provided according to the cylinder 23, and an intake valve 16a is provided in the intake port 22 so as to be freely opened and closed. The engine 16 is provided with an injector 16b that supplies fuel to a combustion chamber defined by a cylinder 23 and a piston 24 through an intake port 22.

  As shown in FIG. 3, the inlet duct 18 is provided below the housing 17, and the outlet duct 19 is provided above the housing 17. The air sucked into the air 17 is raised and purified by the filter element 20 and then flows out from the outlet duct 19.

Further, an HC adsorption filter 25 as an adsorption filter is built in the housing 17, and this HC adsorption filter 25 is downstream of the filter element 20 in the flow direction of the intake air (hereinafter simply referred to as the downstream side). Is located.
The HC adsorption filter 25 protrudes from the lower wall surface (inner peripheral side surface) 17a of the housing 17 toward the upper wall surface (inner peripheral other side surface) 17b of the housing 17, and the lower wall surface 17a and the upper wall surface of the housing 17 In addition to being formed at a height that is half the distance of 17b, it extends across the paper surface in FIG.

  Therefore, the air flowing into the housing 17 from the inlet duct 18 flows out from the outlet duct 19 through the space between the upper end 25a of the HC adsorption filter 25 and the upper wall surface 17b of the housing 17.

  The HC adsorption filter 25 is composed of, for example, an adsorbent such as activated carbon that adsorbs HC (hydrocarbon) as fuel vapor and a case with sufficient air permeability for retaining the adsorbent. HC flowing into the housing 17 is adsorbed.

  On the other hand, an on-off valve 26 is provided on the downstream side of the inlet duct 18, and the on-off valve 26 is driven by an actuator 27 such as a motor, so that a valve closing position indicated by a solid line and a valve opening position indicated by a broken line are provided. The inlet duct 18 is opened and closed by rotating between the two.

  The actuator 27 is driven based on a command signal from an ECU (Electronic Control Unit) 28. The ECU 28 includes a computer including a CPU (central processing unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and sends a command signal to the actuator 27 based on an opening / closing control program stored in the ROM. It is designed to output.

  A crank angle sensor 29 is connected to the ECU 28. The crank angle sensor 29 is composed of an MRE rotation sensor, and this MRE rotation sensor is provided opposite to a magnet rotor (not shown) attached to a crankshaft (not shown) that moves the piston 24 up and down via a connecting rod. It has been. The crank angle sensor 29 outputs a pulse to the ECU 28 every predetermined angle (for example, crank angle 10 ° CA) of the crankshaft.

  The ECU 28 uses the pulses generated by the crank angle sensor 29 to specify the crank angle, calculates the rotational speed of the engine 16, transmits a valve closing command signal to the actuator 27 when the engine 16 stops, A valve opening command signal is transmitted to the actuator 27 during operation.

  The actuator 27 opens and closes the inlet duct 18 by opening the opening / closing valve 26 based on the valve opening command signal from the ECU 28 and closing the opening / closing valve 26 based on the valve closing command signal from the ECU 28. It has become.

  In the present embodiment, the crank angle sensor 29 constitutes an operating state detection means, and the actuator 27 and the ECU 28 constitute an on-off valve control means.

Next, the operation will be described.
When the engine 16 is in operation, the fuel supplied to the combustion chamber defined by the cylinder 23 and the piston 24 stays in the cylinder 23 without being combusted when the engine 16 is stopped, and evaporates. HC flows out from the cylinder 23 in which the valve 16a is opened into the intake passage composed of the intake manifold 14, the throttle body 13, and the outlet duct 19, and the intake passage is filled with HC.

  Further, if the fuel adhering to the wall surface of the intake port 22 remains while the engine 16 is operating, the fuel adhering to the wall surface evaporates while the engine 16 is stopped, and HC is formed in the intake passage. Further, there is a case where the fuel staying in the injector 16b slightly leaks into the intake passage while the engine 16 is stopped and forms HC in the intake passage.

  Thus, when HC is generated in the intake passage while the engine 16 is stopped, the generated HC may be filled in the intake passage and leak out to the atmosphere from the air cleaner device 12. System evaporation may occur.

  In the present embodiment, the HC adsorption filter 25 is protruded from the lower wall surface 17a of the casing 17 toward the upper wall surface 17b, and the air sucked into the casing 17 from the inlet duct 18 is passed between the HC adsorption filter 25 and the upper wall surface 17b. When the ECU 28 determines that the engine 16 is in a stopped state based on the detection information from the crank angle sensor 29, it sends a valve closing command signal to the actuator 27. Thus, the on-off valve 26 is closed.

  For this reason, when HC flows from the outlet duct 19 into the housing 17 while the engine 16 is stopped, as indicated by an arrow A, the HC is confined in the housing 17 and is adsorbed by the HC adsorption filter 25, It is possible to suppress leakage from the duct 18 to the atmosphere.

  For this reason, the HC adsorption filter 25 can be minimized to prevent the configuration from becoming complicated, and the manufacturing cost of the HC adsorption filter 25 can be prevented from increasing. Since HC has a higher specific gravity than air, the HC adsorption efficiency can be increased by providing the HC adsorption filter 25 on the lower wall surface 17a side of the housing 17.

  When the ECU 28 determines that the engine 16 is in an operating state based on the detection information from the crank angle sensor 29, the ECU 28 transmits a valve opening command signal to the actuator 27 to open the on-off valve 26.

  For this reason, the air sucked into the housing 17 from the inlet duct 18 (the air flow is indicated by an arrow B) can flow out from the outlet duct 19 through the space between the upper end 25a of the HC adsorption filter 25 and the upper wall surface 17b. At this time, HC adhering to the HC adsorption filter 25 can be blown off from the outlet duct 19 toward the engine 16 and burned by the engine 16.

  In this embodiment, since the HC adsorption filter 25 can be minimized as described above, the HC adsorption filter 25 becomes an intake resistance when the on-off valve 26 is opened during operation of the engine 16. And the pressure loss of the intake air can be reduced.

(Second Embodiment)
4-6 is a figure which shows 2nd Embodiment of the air cleaner apparatus which concerns on this invention, The same number is attached | subjected to the structure similar to 1st Embodiment, and description is abbreviate | omitted.

  4 and 5, the casing 17 is provided with a first inlet duct 31 and a second inlet duct 32, and the first inlet duct 31 is provided below the casing 17. In addition, the second inlet duct 32 is provided above the housing 17.

  An on-off valve 33 is provided on the downstream side of the second inlet duct 32, and the on-off valve 33 opens and closes the second inlet duct 32 by being driven by an actuator 34 such as a motor. ing.

  The actuator 34 is driven based on a command signal from the ECU 35. The ECU is composed of a computer including a CPU, a ROM, a RAM, and the like, and outputs a command signal to the actuator 34 based on an opening / closing control program stored in the ROM.

  Further, a crank angle sensor 29 is connected to the ECU 35, and the ECU 35 specifies a crank angle using a pulse generated by the crank angle sensor 29 and calculates the rotation speed of the engine 16. Based on this, when the operating state of the engine 16 is detected, the on-off valve 33 is controlled to open / close in accordance with the operating state of the engine 16 and the on-off valve 33 is closed when the engine 16 is stopped. Yes.

  Further, the HC adsorption filter 25 of the present embodiment is provided at a position facing the first inlet duct 31 with the filter element 20 interposed therebetween. In the present embodiment, the actuator 34 and the ECU 35 constitute an on-off valve control means.

  Next, the opening / closing control processing of the opening / closing valve 33 will be described based on the flowchart shown in FIG. The opening / closing control process shown in FIG. 6 is a control procedure of an opening / closing control program stored in the ROM of the ECU 35 and executed by the CPU.

  In FIG. 6, the ECU 35 determines whether or not the engine 16 is stopped based on the detection information of the crank angle sensor 29 (step S <b> 1), and when determining that the engine 16 is stopped, the ECU 35. Transmits a valve closing command signal to the actuator 34 to close the on-off valve 33 (step S2).

  Therefore, when HC flows into the casing 17 from the outlet duct 19 while the engine 16 is stopped, the HC is trapped in the casing 17 and adsorbed by the HC adsorption filter 25 as indicated by an arrow A. Thus, leakage from the second inlet duct 32 to the atmosphere can be suppressed.

  Further, since the HC adsorption filter 25 is provided at a position facing the first inlet duct 31 that is always open via the filter element 20, the HC that has flowed into the casing 17 through the outlet duct 19. Is moved downward and is actively adsorbed by the HC adsorption filter 25, so that it is difficult to flow into the first inlet duct 31.

  On the other hand, if the ECU 35 determines in step S1 that the engine 16 is in operation, whether or not the rotational speed of the engine 16 is less than the predetermined rotational speed based on the detection information from the crank angle sensor 29 is determined. It discriminate | determines (step S3).

  When the ECU 35 determines that the rotational speed of the engine 16 is less than a predetermined rotational speed, for example, less than 3000 rpm, the ECU 35 transmits a valve closing command signal to the actuator 34 to close the on-off valve 33 (step S4). .

  For this reason, in the low / medium speed rotation region of the engine 16, the second inlet duct 32 is closed and the air cleaner apparatus 12 draws outside air only from the first inlet duct 31, thereby increasing the flow rate of the intake air. Output can be improved.

  On the other hand, if the CPU determines in step S3 that the rotational speed of the engine 16 is equal to or higher than the predetermined rotational speed, the CPU transmits a valve opening command signal to the actuator 34 to open the on-off valve 33 (step S5). .

  For this reason, the second inlet duct 32 is opened in the high-speed rotation region of the engine 16, and the air cleaner device 12 is caused to suck the outside air from the first inlet duct 31 and the second inlet duct 32 as indicated by the arrow B. As a result, the amount of intake air can be increased and the output of the engine 16 can be improved.

  As described above, in the present embodiment, since the on-off valve 33 provided in the second inlet duct 32 is closed while the engine 16 is stopped, the casing from the outlet duct 19 is stopped while the engine 16 is stopped. When HC flows into 17, it is possible to prevent the HC from being trapped in the housing 17 and leaking from the first inlet duct 31 and the second inlet duct 32 to the atmosphere.

  For this reason, the HC adsorption filter 25 can be minimized to prevent the configuration from becoming complicated, and the manufacturing cost of the HC adsorption filter 25 can be prevented from increasing. In addition, since the HC adsorption filter 25 can be minimized, it is possible to suppress the HC adsorption filter 25 from becoming an intake resistance during the operation of the engine 16, and to reduce the pressure loss of the intake air.

  In the present embodiment, the first inlet duct 31 is always open, but an opening / closing valve is provided in the first inlet duct 31 and provided in the first inlet duct 31 when the engine 16 is stopped. The on-off valve may be closed. In this way, it is possible to further suppress the leakage of HC into the atmosphere.

  The embodiment disclosed this time is illustrative in all respects and is not limited to this embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  As described above, the air cleaner device according to the present invention can prevent the suction filter from being increased in size by simplifying and simplifying the suction filter while preventing the pressure loss of the intake air. This is useful as an air cleaner device that can prevent the fuel vapor leaking through the outlet duct from diffusing into the outside air.

It is a figure which shows 1st Embodiment of the air cleaner apparatus which concerns on this invention, and is a block diagram of an engine and an intake device. It is a figure which shows 1st Embodiment of the air cleaner apparatus which concerns on this invention, and is sectional drawing of an engine and an intake device. It is a figure which shows 1st Embodiment of the air cleaner apparatus which concerns on this invention, and is sectional drawing of an air cleaner apparatus. It is a figure which shows 2nd Embodiment of the air cleaner apparatus which concerns on this invention, and is sectional drawing of an engine and an intake device. It is a figure which shows 2nd Embodiment of the air cleaner apparatus which concerns on this invention, and is sectional drawing of an air cleaner apparatus. It is a figure which shows 2nd Embodiment of the air cleaner apparatus which concerns on this invention, and is a flowchart which shows the procedure of an opening / closing control process. It is a figure which shows the air cleaner apparatus provided with the conventional HC adsorption filter.

Explanation of symbols

12 Air cleaner 16 Engine (Internal combustion engine)
17 Housing 17a Lower wall surface (one side of inner circumference)
17b Upper wall surface (inner circumference and other side surfaces)
18 Inlet duct 19 Outlet duct 20 Filter element 25 HC adsorption filter (adsorption filter)
26, 33 Open / close valve 27, 34 Actuator (open / close valve control means)
28, 35 ECU (open / close valve control means)
29 Crank angle sensor (operating state detection means)
31 First inlet duct 32 Second inlet duct

Claims (2)

A housing having an inlet duct for sucking air from the outside and an outlet duct for supplying the sucked air to the internal combustion engine, and a filter element for purifying the air sucked from the inlet duct;
An adsorption filter that is provided in the casing so as to be positioned downstream of the filter element in the flow direction of intake air, and that adsorbs fuel vapor flowing into the casing through the outlet duct;
The adsorption filter protrudes from the inner peripheral side surface of the casing toward the inner peripheral other side surface, and the air sucked into the casing from the inlet duct passes between the adsorption filter and the inner peripheral other side surface of the casing. An air cleaner device configured to flow out from the outlet duct,
The inlet duct is composed of a first inlet duct and a second inlet duct;
An on-off valve provided in each of the first inlet duct and the second inlet duct, for opening and closing the first inlet duct and the second inlet duct ;
An operating state detecting means for detecting an operating state of the internal combustion engine;
When detecting a stop state of the internal combustion engine based on detection information from the operating state detection means, the on- off valves provided in the first inlet duct and the second inlet duct are closed, and When the operating state of the internal combustion engine is detected based on detection information from the operating state detection means, the on-off valve provided in the second inlet duct is opened and closed according to the operating state of the internal combustion engine. An on- off valve control means for controlling is provided. The air cleaner apparatus according to claim 1, wherein the adsorption filter is provided at a position facing the first inlet duct with the filter element interposed therebetween.

Images