阅读说明：本技术 液面检测系统及应用该系统的液面检测方法 (Liquid level detection system and liquid level detection method using same ) 是由 张朝钦 于 2019-02-27 设计创作，主要内容包括：本发明的公开一种液面检测系统及应用该系统的液面检测方法,液面检测系统适用于容器,容器用以容纳液体且包括容纳体和盖体,盖体设置于容纳体上。液面检测系统包括浮标、第二通讯模块、第二陀螺仪及处理器。浮标包括光电测距组件、第一陀螺仪及第一通讯模块,光电测距组件及第一陀螺仪电性连接第一通讯模块,光电测距组件面向盖体以量测光电测距组件与盖体之间的一距离值,第一通讯模块用以传送第一陀螺仪的信号。第二陀螺仪配置于盖体。第二通讯模块配置于盖体且电性连接第二陀螺仪用以传送第二陀螺仪的信号。处理器用以：判断第一陀螺仪的垂直轴向与第二陀螺仪的垂直轴向是否平行；及,当第一陀螺仪的垂直轴向与第二陀螺仪的垂直轴向平行时,依据光电测距组件所量测的距离值,计算液体的体积。(The invention discloses a liquid level detection system and a liquid level detection method using the same. The liquid level detection system comprises a buoy, a second communication module, a second gyroscope and a processor. The buoy comprises a photoelectric distance measuring assembly, a first gyroscope and a first communication module, the photoelectric distance measuring assembly and the first gyroscope are electrically connected with the first communication module, the photoelectric distance measuring assembly faces the cover body to measure a distance value between the photoelectric distance measuring assembly and the cover body, and the first communication module is used for transmitting signals of the first gyroscope. The second gyroscope is arranged on the cover body. The second communication module is configured on the cover body and electrically connected with the second gyroscope for transmitting signals of the second gyroscope. The processor is used for: judging whether the vertical axial direction of the first gyroscope is parallel to the vertical axial direction of the second gyroscope; and when the vertical axial direction of the first gyroscope is parallel to the vertical axial direction of the second gyroscope, calculating the volume of the liquid according to the distance value measured by the photoelectric distance measuring assembly.)

1. A liquid level detection system is suitable for a container, the container is used for containing a liquid and comprises a containing body and a cover body, the cover body is arranged on the containing body, and the liquid level detection system is characterized by comprising:

the buoy is used for floating on the liquid and comprises a photoelectric distance measuring assembly, a first gyroscope and a first communication module, the photoelectric distance measuring assembly and the first gyroscope are electrically connected with the first communication module, the photoelectric distance measuring assembly faces the cover body to measure a distance value between the photoelectric distance measuring assembly and the cover body, and the first communication module is used for transmitting a signal of the first gyroscope and the distance value;

a second gyroscope disposed on the cover;

the second communication module is configured on the cover body, electrically connected with the second gyroscope and used for transmitting signals of the second gyroscope; and

a processor configured to:

judging whether the vertical axial direction of the first gyroscope is parallel to the vertical axial direction of the second gyroscope according to the signal of the first gyroscope and the signal of the second gyroscope; and

when the vertical axis of the first gyroscope is parallel to the vertical axis of the second gyroscope, calculating a volume of the liquid according to the distance value measured by the photoelectric distance measuring component.

2. The system of claim 1, wherein when the processor is disposed on the float, the processor is electrically connected to the electro-optical distance measuring device, the first gyroscope and the first communication module, and the second communication module is configured to transmit a signal of the second gyroscope to the first communication module; when the processor is configured on the cover body, the processor is electrically connected with the second gyroscope and the second communication module, and the first communication module is used for transmitting the signal of the first gyroscope and the distance value measured by the photoelectric distance measuring assembly to the second communication module.

3. The fluid level sensing system of claim 1, wherein the processor is disposed outside the float and the container, and the first communication module is configured to transmit the signal of the first gyroscope and the distance value measured by the electro-optical ranging module to the processor, and the second communication module is configured to transmit the signal of the second gyroscope to the processor.

4. The fluid level detection system of claim 1, wherein the processor is further configured to:

and calculating the volume of the liquid according to the sectional area of the container, the height of the container, the distance value between the photoelectric distance measuring assembly and the liquid level of the liquid and the distance value measured by the photoelectric distance measuring assembly.

5. The fluid level detection system of claim 1, wherein the processor is further configured to:

and obtaining the volume of the liquid corresponding to the distance value according to a corresponding relation between the distance value and the volume.

6. The liquid level detecting system according to claim 1, wherein the float further comprises a first battery, the cover further comprises a second battery, the first battery is electrically connected to the electro-optical distance measuring device, the first gyroscope and the first communication module, and the second battery is electrically connected to the second gyroscope and the second communication module.

7. The fluid level detection system defined in claim 1, wherein the container has an opening and the cover is disposed entirely over the opening, the fluid level detection system further comprising a connection line connecting the cover and the float.

8. The fluid level sensing system of claim 1, wherein the float has an arcuate upper surface extending outwardly from a periphery of the electro-optical ranging assembly.

9. The fluid level detection system defined in claim 1, wherein the outer surface of the float is formed with a coating to prevent the fluid from sticking to the outer surface of the float.

10. A liquid level detection method, comprising:

providing a fluid level detection system according to claim 1;

judging whether the vertical axial direction of the first gyroscope is parallel to the vertical axial direction of the second gyroscope according to the signal of the first gyroscope and the signal of the second gyroscope; and

when the vertical axis of the first gyroscope is parallel to the vertical axis of the second gyroscope, the volume of the liquid is calculated according to the distance value measured by the photoelectric distance measuring component.

11. The liquid level detection method according to claim 10, further comprising:

when the vertical axis of the first gyroscope is non-parallel to the vertical axis of the second gyroscope, the volume of the liquid is not calculated.

Technical Field

The present invention relates to a liquid level detection system and a liquid level detection method using the same, and more particularly, to a liquid level detection system having two gyroscopes and a liquid level detection method using the same.

Background

The traditional liquid level detection mainly comprises a light source which is emitted from the inside of the photoelectric distance measuring assembly, the light source is totally reflected to a receiver of the photoelectric distance measuring assembly through transparent resin, but when the liquid level is met, part of light is refracted to the liquid, and therefore the photoelectric distance measuring assembly detects the reduction of the total reflection light value to monitor the liquid level. However, such an approach is not suitable for liquids with low light reflectance (insufficient light reflectance, which may result in low accuracy of the measured distance value) or non-transparency.

Disclosure of Invention

According to an embodiment of the present invention, a liquid level detecting system is provided. The liquid level detection system is suitable for a container which is used for containing liquid and comprises a containing body and a cover body, wherein the cover body is arranged on the containing body. The liquid level detection system comprises a buoy, a second communication module, a second gyroscope and a processor. The buoy is used for floating on liquid and comprises a photoelectric distance measuring assembly, a first gyroscope and a first communication module, the photoelectric distance measuring assembly and the first gyroscope are electrically connected with the first communication module, the photoelectric distance measuring assembly faces the cover body to measure a distance value between the photoelectric distance measuring assembly and the cover body, and the first communication module is used for transmitting signals of the first gyroscope. The second gyroscope is arranged on the cover body. The second communication module is configured on the cover body, electrically connected with the second gyroscope and used for transmitting signals of the second gyroscope. The processor is used for: judging whether the vertical axial direction of the first gyroscope is parallel to the vertical axial direction of the second gyroscope; and when the vertical axial direction of the first gyroscope is parallel to the vertical axial direction of the second gyroscope, calculating the volume of the liquid according to the distance value measured by the photoelectric distance measuring assembly.

According to another embodiment of the present invention, a liquid level detecting method is provided. The liquid level detection method includes the following steps. Providing a fluid level detection system as described above; judging whether the vertical axial direction of the first gyroscope is parallel to the vertical axial direction of the second gyroscope or not according to the signal of the first gyroscope and the signal of the second gyroscope; and when the vertical axis of the first gyroscope is parallel to the vertical axis of the second gyroscope, calculating the volume of the liquid according to the distance value measured by the photoelectric distance measuring assembly.

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.

Drawings

FIG. 1A is a schematic view of a fluid level detection system according to an embodiment of the invention;

FIG. 1B is a schematic illustration of the container of FIG. 1A when tilted;

FIG. 2 is a schematic diagram of a fluid level detection system according to another embodiment of the invention;

FIG. 3 is a schematic diagram of a fluid level detection system according to another embodiment of the invention;

FIG. 4 is a schematic diagram of a fluid level detection system according to another embodiment of the invention;

FIG. 5 is a schematic view of a buoy according to another embodiment of the invention;

FIG. 6 is a flow chart illustrating a liquid level detection method according to an embodiment of the invention.

Detailed Description

The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:

referring to fig. 1A and 1B, fig. 1A is a schematic diagram illustrating a liquid level detection system 100 according to an embodiment of the invention, and fig. 1B is a schematic diagram illustrating a container 110 of fig. 1A tilted.

The liquid level detection system 100 includes a float 120, a second communication module 130, a second gyroscope 140, a processor 150, and a second battery 160. The processor 150 is, for example, a Microcontroller (MCU). The second communication module 130 and/or the processor 150 are, for example, hardware circuit (circuit) components formed by a semiconductor process.

The level detection system 100 is adapted for use with a container 110. The container 110 may be mounted in a vehicle, plant, or other suitable device. The container 110 is used for containing the liquid L and includes a cover 111 and a container 112. The cover 111 may be disposed on the accommodating body 112. The liquid L is for example water, oil or a chemical liquid. The buoy 120 floats on the liquid L and includes an electro-optical ranging assembly 121, a first gyroscope 122, and a first communication module 123. The electro-optical distance measuring device 121 and/or the first communication module 123 are hardware circuit devices formed by a semiconductor process, for example. The photoelectric distance measuring assembly 121 and the first gyroscope 122 are electrically connected to the first communication module 123, and the photoelectric distance measuring assembly 121 faces the cover 111 to measure a distance value D between the photoelectric distance measuring assembly 121 and the cover 111. The first communication module 123 is used for transmitting the signal S1 of the first gyroscope 122 and the distance value D. The second gyroscope 140 and the second communication module 130 are disposed on the cover 111. The second gyroscope 140 is electrically connected to the second communication module 130. The second communication module 130 is used for transmitting the signal S2 of the second gyroscope. The processor 150 is configured to (1) determine whether the vertical axis Z1 of the first gyroscope 122 is parallel to the vertical axis Z2 of the second gyroscope 140 according to the signal S1 of the first gyroscope 122 and the signal S2 of the second gyroscope 140, and (2) calculate the volume of the liquid L according to the distance value D measured by the electro-optical distance measuring device 121 when the vertical axis Z1 of the first gyroscope 122 is parallel to the vertical axis Z2 of the second gyroscope 140 (as shown in fig. 1A). Since the electro-optical distance measuring device 121 of the embodiment of the present invention emits the detection light toward the cover 111, it is not affected by the transparency of the liquid L. In other words, even if the liquid L is a low reflective (e.g., opaque) liquid, the measurement of the distance value D is not affected. In one embodiment, in order to increase the reflection amount of the detection light of the electro-optical ranging device 121 from the cover 111, a reflective layer (not shown) may be selectively formed on the lower surface 111b of the cover 111, wherein the lower surface 111b faces the electro-optical ranging device 121.

Further, when the vertical axis Z1 of the first gyroscope 122 is parallel to the vertical axis Z2 of the second gyroscope 140, the processor 150 calculates the volume of the liquid L (the liquid stock amount), so the computational burden on the processor 150 can be reduced, and the error between the calculated volume of the liquid and the actual stock amount of the liquid L in the container 110 is minimized. The first gyroscope 122 is, for example, a multi-axis gyroscope, such as a three-axis gyroscope, in which the vertical axis Z1 is one of the multiple axes. The second gyroscope 140 and the vertical axis Z1 have similar or identical features to the first gyroscope 122 and the vertical axis Z2, respectively, and are not described herein again.

As shown in fig. 1B, when the container 110 is tilted, the included angle θ between the vertical axis Z1 of the first gyroscope 122 and the vertical axis Z2 of the second gyroscope 140 is not equal to 0 or 180 degrees (i.e., is not parallel), and the processor 150 may not calculate the volume of the liquid L, so as to avoid increasing the operation burden of the processor 150. As such, a portable container may be used as the container 110 of the fluid level detection system 100 according to embodiments of the present invention.

In the embodiment, the liquid L is stored in the accommodating space 112r of the accommodating body 112. Although not shown, the liquid level detection system 100 may further include a display device electrically connected to the processor 150 and capable of displaying the value of the volume of the liquid L. The display component is for example a screen or an indicator, such as an indicator light. The aforementioned display assembly may be disposed outside the cover 111, the receiving body 112, or the container 110. In addition, although not shown, the fluid level detection system 100 may include a sound generating component electrically connected to the processor 150. When the calculated volume of the liquid L is lower than a predetermined value, the processor 150 may control the sound generating assembly to generate an alert sound to alert the user that the level of the liquid L in the container 110 is in a low level state. The aforementioned default value is, for example, 10%, lower, or higher of the total volume of the accommodation space 112r of the accommodation body 112. The sound generating member may be disposed outside the cover 111, the receiving body 112, or the container 110. The monitoring person can perform corresponding treatment, such as liquid replenishment, by calculating the volume of the liquid L or a warning sound.

As shown in fig. 1A and 1B, the vertical axis Z1 of the first gyroscope 122 is in the same direction regardless of the position of the float 120 floating on the liquid L, such that the vertical axis Z1 of the first gyroscope 122 provides a fixed reference. Thus, by determining the difference change of the vertical axis Z2 of the second gyroscope 140 relative to the fixed reference, it can be known that the posture of the container 110 is a regular pendulum (as shown in fig. 1A), a slant pendulum (as shown in fig. 1B) or a wobble. Furthermore, since the vertical axis Z1 of the first gyroscope 122 is oriented in the same direction regardless of the position of the float 120 floating on the liquid L, the position of a particular float 120 may not be considered when placing the float 120 in the receptacle 112, nor may any particular concern be given to the securement of the float 120.

In the present embodiment, the processor 150 is disposed outside the buoy 120 and the container 110, and is, for example, a server disposed at the rear end. In another embodiment, the fluid level detection system 100 may omit the processor 150. The first communication module 123 is, for example, a wireless communication module for transmitting the signal S1 of the first gyroscope 122 and the distance D measured by the electro-optical ranging device 121 to the processor 150, and the second communication module 130 is, for example, a wireless communication module for transmitting the signal S2 of the second gyroscope 140 to the processor 150. The wireless communication module is, for example, a WiFi communication module, a bluetooth communication module, or other communication modules conforming to a communication protocol, and the embodiment of the present invention is not limited to the type of the wireless communication module. The processor 150 determines whether the vertical axis Z1 of the first gyroscope 122 is parallel to the vertical axis Z2 of the second gyroscope 140 according to the signal S1 of the first gyroscope 122 and the signal S2 of the second gyroscope 140. When the vertical axis Z1 of the first gyroscope 122 is parallel to the vertical axis Z2 of the second gyroscope 140, the processor 150 calculates the volume of the liquid L. In another embodiment, the second communication module 130 may transmit the signal S2 of the second gyroscope 140 to the first communication module 123, and the first communication module 123 transmits the signal S2 of the second gyroscope 140 and the signal S1 of the first gyroscope 122 to the processor 150 for operation. Alternatively, the first communication module 123 may transmit the signal S1 of the first gyroscope 122 to the second communication module 130, and the second communication module 130 transmits the signal S2 of the second gyroscope 140 and the signal S1 of the first gyroscope 122 to the processor 150 for operation. In other embodiments, the second communication module 130 and the first communication module 123 may also be electrically connected through a line (not shown), so that the signal S1 of the first gyroscope 122 and the signal S2 of the second gyroscope 140 are transmitted through a wired manner.

In an embodiment, the processor 150 is further configured to: the volume of the liquid L is calculated according to the cross-sectional area a of the accommodating space 112r of the container 110 (the label a in fig. 1A indicates the top-view area of the accommodating space 112 r), the height H of the accommodating space 112r of the container 110, the distance H between the sensing surface 121u of the electro-optical distance measuring device 121 and the liquid level Le of the liquid L, and the distance D measured by the electro-optical distance measuring device 121. In detail, the processor 150 may calculate the volume VL of the liquid L according to the following formula (1). The following expression (1) is suitable for a case where the accommodating space 112r is of a regular shape, for example, the sectional area a of the accommodating space 112r is constant (constant) along the height. The values of the cross-sectional area a, the height H, and the distance H may be pre-stored in the processor 150 or another storage unit (e.g., a memory).

VL＝A×(H-h-D)...........................(1)

In another embodiment, the processor 150 calculates or looks up a table to obtain the volume of the liquid L corresponding to the distance value D according to a corresponding relationship (not shown) between the distance value D and the liquid volume. The corresponding relationship is, for example, a discrete numerical relationship (such as a table) or a curve equation. The corresponding relationship can be obtained by performing an experiment on the relationship between the distance value D and the liquid volume in the container 110. After obtaining the corresponding relationship, the corresponding relationship may be stored in the processor 150 or another storage unit (e.g., a memory). When the accommodating space 112r of the container 110 is irregular, the liquid volume corresponding to the distance value D can be obtained by looking up the table according to the corresponding relationship obtained by experiments in advance.

As shown in fig. 1A, the buoy 120 further includes a buoy body 124, and the electro-optical distance measuring device 121, the first gyroscope 122 and the first communication module 123 may be disposed in the buoy body 124 to avoid being damaged by the liquid L. In addition, the buoy 120 further includes a first battery 125 electrically connected to the electro-optical distance measuring device 121, the first gyroscope 122 and the first communication module 123 for supplying power to these devices. In addition, the second battery 160 is disposed on the cover 111, and is electrically connected to the second communication module 130 and the second gyroscope 140 to supply power to these components. Although not shown, the buoy 120 further includes a weight disposed at the bottom of the buoy body 124.

Referring to fig. 2, a schematic diagram of a liquid level detection system 200 according to another embodiment of the invention is shown. The liquid level detecting system 200 includes a float 220, a second communication module 130, a second gyroscope 140, a processor 150, a second battery 160, and a connecting wire 270. The level detection system 200 may be adapted for use with the container 110. The fluid level detection system 200 of the present embodiment has similar or identical features to the fluid level detection system 100, except that the processor 150 of the fluid level detection system 200 is disposed in the float 220 and the second communication module 130 is electrically connected to the first communication module 123 of the float 220 by the connection line 270.

As shown in fig. 2, the processor 150 is disposed in the float body 124 of the float 220 and electrically connected to the electro-optical distance measuring device 121, the first gyroscope 122 and the first communication module 123 to receive the distance value D from the electro-optical distance measuring device 121, the signal S1 from the first gyroscope 122 and the signal S2 from the second gyroscope 130 from the first communication module 123 (the first communication module 123 receives from the second communication module 130). In the present embodiment, the signal S1 of the first gyroscope 122 is transmitted by the physical connection 270. However, in another embodiment, the connection line 270 may be omitted from the liquid level detection system 200, in which case the signal S2 of the second gyroscope 140 is wirelessly transmitted to the first communication module 123, and then transmitted to the processor 150 for operation by the first communication module 123. The processor 150 of the fluid level detection system 200 calculates the volume of the fluid L in a manner similar to or the same as that of the processor 150 of the fluid level detection system 100, and thus, the description thereof is omitted.

Referring to fig. 3, a schematic diagram of a liquid level detection system 300 according to another embodiment of the invention is shown. The liquid level detecting system 300 includes a float 120, a second communication module 130, a second gyroscope 140, a processor 150, a second battery 160, and a connecting wire 270. The level detection system 300 may be adapted for use with the container 110. The fluid level detection system 300 of the present embodiment has similar or identical features to the fluid level detection system 100, except that the processor 150 of the fluid level detection system 300 is disposed in the cover 111 and the second communication module 130 is electrically connected to the first communication module 123 of the float 120 by the connection line 270.

As shown in fig. 3, the processor 150 is disposed in the cover 111 and electrically connected to the second gyroscope 140 and the second communication module 130 to receive the signal S2 transmitted from the second gyroscope 140 and the signal S1 and the distance value D of the first gyroscope 122 transmitted from the second communication module 130 (the second communication module 130 receives from the first communication module 123). In the present embodiment, the signal S1 of the first gyroscope 122 is transmitted by the physical connection 270. However, in another embodiment, the connection line 270 may be omitted from the liquid level detection system 300, in which case the signal S1 of the first gyroscope 122 and the distance value D may be transmitted to the second communication module 130 by wireless transmission, and then transmitted to the processor 150 for operation by the second communication module 130. The processor 150 of the fluid level detection system 200 calculates the volume of the fluid L in a manner similar to or the same as that of the processor 150 of the fluid level detection system 100, and thus, the description thereof is omitted.

In summary, the signal transmission between the first communication module 122, the second communication module 130 and the processor 150 can be transmitted in a wired and/or wireless manner.

Referring to fig. 4, a schematic diagram of a liquid level detection system 400 according to another embodiment of the invention is shown. The liquid level detecting system 400 includes a float 120, a second communication module 130, a second gyroscope 140, a processor 150, a second battery 160, and a connecting wire 470. The level detection system 400 may be adapted for use with a container 410. In another embodiment, the fluid level detection system 400 may omit the processor 150. In the embodiment of the present invention, the container 410 of the liquid level detecting system 400 comprises a cover 411 and a container 412, wherein the cover 411 is connected to the float 120 by a connecting line 470.

As shown in fig. 4, the cover 411 may be disposed on the accommodating body 412. For example, the container 412 of the container 410 has an opening 412a, and the cover 411 is detachably (e.g., screwed or fastened) disposed in the opening 412a of the container 412. The connection line 470 connects the float body 124 of the float 120 and the cover 411. Thus, when the cover 411 is detached from the accommodating body 412, the float 120 can be pulled out of the accommodating body 411 through the connecting line 470. In an embodiment, the connecting wire 470 is a non-conductive wire. In another embodiment, the connecting wire 470 may be a conductive wire and electrically connects the first communication module 122 and the second communication module 130. In addition, the suitable container 110 of the liquid level detection system 200 of FIG. 2 can be replaced by the container 410, and the suitable container 110 of the liquid level detection system 300 of FIG. 3 can be replaced by the container 410.

Referring to fig. 5, a schematic diagram of a buoy 520 according to another embodiment of the invention is shown. The buoy 520 includes a buoy body 524, the electro-optical distance measuring assembly 121, the first gyroscope 122 (not shown), the first communication module 123 (not shown), and the first battery 125 (not shown). The float body 524 has an arc-shaped upper surface 524u, and the upper surface 524u extends outward from the periphery of the electro-optical ranging device 121 to guide the fluid L attached to the upper surface 524u or the sensing surface 121u of the electro-optical ranging device 121 to leave the float body 524, so as to prevent the fluid L from remaining on the sensing surface 121u and adversely affecting the sensing accuracy of the electro-optical ranging device 121.

In addition, a paint (not shown) may be formed on the outer surface of the float body 524 to prevent the liquid L from sticking to the outer surface of the float body 524. The paint is, for example, a nano paint or an antifouling paint, and can effectively prevent the thick or highly viscous liquid L from adhering to the outer surface of the float body 524.

Referring to fig. 6, a flow chart of a liquid level detection method according to an embodiment of the invention is shown.

In step S110, the aforementioned liquid level detection system 100 is provided.

In step S120, the processor 150 of the liquid level detection system 100 determines whether the vertical axis Z1 of the first gyroscope 122 is parallel to the vertical axis Z2 of the second gyroscope 140 according to the signal S1 of the first gyroscope 122 and the signal S2 of the second gyroscope 140. When the vertical axis Z1 of the first gyroscope 122 is parallel to the vertical axis Z2 of the second gyroscope 140, the flow advances to step S130; when the vertical axis Z1 of the first gyroscope 122 is not parallel to the vertical axis Z2 of the second gyroscope 140, the flow advances to step S140.

In step S130, when the vertical axis Z1 of the first gyroscope 122 is parallel to the vertical axis Z2 of the second gyroscope 140 (as shown in fig. 1A), the processor 150 calculates the volume VL of the liquid L according to the distance value D measured by the electro-optical distance measuring assembly 121.

In step S140, when the vertical axis Z1 of the first gyroscope 122 is not parallel to the vertical axis Z2 of the second gyroscope 140 (as shown in fig. 1B), the processor 150 does not calculate the volume VL of the liquid L, so as to reduce the operation burden of the processor 150. In other words, the liquid level detection method according to the embodiment of the present invention calculates the volume VL of the liquid L when the vertical axis Z1 of the first gyroscope 122 is parallel to the vertical axis Z2 of the second gyroscope 140, and thus can effectively reduce the operation load of the processor 150.

The liquid level detection method of the liquid level detection systems 200, 300, and/or 400 has a similar or identical process to the liquid level detection method of the liquid level detection system 100, and will not be described herein again.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.