Infrared detection system, detection method and washing machine

Abstract

The application discloses an infrared detection system, a detection method and a washing machine. The infrared detection system comprises an infrared emitter tube, an infrared receiver tube, a power amplifier circuit, a signal processing circuit module and a detection control circuit. The infrared receiver tube receives the infrared signal emitted by the infrared emitter tube. The power amplifier circuit performs power amplification on the infrared signal received by the infrared receiver tube to obtain a power amplified signal. The signal processing circuit module collects and processes the infrared signals output by the infrared emitter tube and the infrared receiver tube and obtains a processed signal. The detection system and method provided by the application can detect whether the infrared detection function of the infrared detection system is abnormal according to the power amplified signal and the processed signal. When the infrared detection function is detected to be abnormal, the specific element that fails in the infrared detection system can be determined according to the different signal states of the processed signal, so that the production line test and the positioning of the element failure point are facilitated, and the later maintenance is facilitated.

Description

Technical Field

[0001] This invention relates to the field of infrared detection technology, specifically to an infrared detection system, detection method, and washing machine. Background Technology

[0002] In today's fast-paced lifestyle, people often forget to check clothing pockets when using washing machines. If the clothes contain metal parts such as coins or keys, it can cause the washing machine to make unusual noises. The consequences are even more serious if electronic components like car keys are found in the pockets. Even if users remember to check the pockets every time, the numerous or unusual pockets on modern clothing designs make checking each one quite tedious.

[0003] Secondly, metal parts on clothing may scratch the garments during washing. Existing washing machines are equipped with infrared detectors and metal detectors to detect whether there are metal foreign objects in the clothes. However, when the infrared detection function of the infrared detector malfunctions, the metal detector's results in detecting metal foreign objects are not accurate enough and are prone to misjudgment. Therefore, it is necessary to design an infrared detection system and detection method that can self-detect malfunctions to make the detection results of metal foreign objects more accurate.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art. On the one hand, the present invention provides an infrared detection system that can detect faults on its own and improve the accuracy of detection results.

[0006] Another aspect of the present invention provides a washing machine having the above-described infrared detection system.

[0007] In another aspect, the present invention provides an infrared detection method applicable to the aforementioned washing machine.

[0008] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0009] This invention provides an infrared detection system, comprising: an infrared emitting tube; and an infrared receiving tube, disposed opposite to the infrared emitting tube, for receiving infrared signals emitted by the infrared emitting tube.

[0010] A power amplifier circuit, connected to the infrared receiver tube, is used to amplify the infrared signal received by the infrared receiver tube to obtain a power amplified signal.

[0011] The signal processing circuit module is connected to the infrared emitting tube and the infrared receiving tube, and is used to collect and process the infrared signals output by the infrared emitting tube and the infrared signals output by the infrared receiving tube, and obtain the processed signal.

[0012] The detection control circuit is connected to the infrared emitting tube, the power amplifier circuit, and the signal processing circuit module, and is used to determine whether the infrared detection function of the infrared detection system is abnormal based on the power amplification signal and the processed signal.

[0013] In one implementation, the signal processing circuit module includes a time-division multiplexing circuit and an ADC conversion circuit;

[0014] The time-division multiplexing circuit is connected to the infrared emitting tube and the infrared receiving tube, and the ADC conversion circuit is connected to the time-division multiplexing circuit and the detection and control circuit.

[0015] In another implementation, the signal processing circuit module includes a first ADC conversion circuit and a second ADC conversion circuit;

[0016] The first ADC conversion circuit is connected to the infrared emitting tube and the detection control circuit, and the second ADC conversion circuit is connected to the infrared receiving tube and the detection control circuit.

[0017] The present invention also provides a washing machine having any of the above-described infrared detection systems, comprising:

[0018] The outer barrel lid, wherein the infrared emitting tube and the infrared receiving tube are respectively installed on the inner peripheral wall of the outer barrel lid;

[0019] Alternatively, it may include a tray base with a clothing loading port, wherein the infrared emitting tube and the infrared receiving tube are respectively installed on the side wall of the tray base facing the clothing loading port.

[0020] Furthermore, it also includes

[0021] The circuit control board integrates the power amplifier circuit, the signal processing circuit module, and the detection and control circuit.

[0022] The present invention also provides an infrared detection method for use in the above-mentioned washing machine, comprising the following steps:

[0023] S1: After the washing machine is turned on, the detection control circuit detects whether the power amplification signal is received. If yes, it determines that the infrared detection function of the infrared detection system is normal. If no, it proceeds to step S2.

[0024] S2: The signal processing circuit module acquires and processes the infrared signal output by the infrared emitting tube and the infrared signal output by the infrared receiving tube, and obtains the processed signal; the detection and control circuit controls the execution of different operations according to the different signal states of the detected processed signal.

[0025] Furthermore, in step S2, both the infrared signal emitted by the infrared emitting tube and the infrared signal received by the infrared receiving tube are square wave signals with a specific frequency.

[0026] Furthermore, in step S2, the processing signal has a first signal state;

[0027] In the first signal state, the detection control circuit detects that the processed signal includes the square wave signal output by the infrared emitting tube and the square wave signal output by the infrared receiving tube.

[0028] The detection and control circuit performs a first execution operation, which is to detect a fault in the power amplifier circuit.

[0029] Furthermore, in step S2, the processed signal has a second signal state;

[0030] In the second signal state, the detection control circuit detects that the processed signal includes the square wave signal output by the infrared emitting tube and the DC voltage signal output by the infrared receiving tube;

[0031] The detection control circuit performs a second execution operation, which includes detecting whether the infrared emitting tube and the infrared receiving tube are faulty, detecting whether the infrared emitting tube and the infrared receiving tube are on the same plane when they are arranged opposite each other, and prompting to clean at least one of the infrared emitting tube and / or the infrared receiving tube.

[0032] Furthermore, in step S2, the processing signal has a third signal state;

[0033] In the third signal state, the detection control circuit detects that the processed signal includes the non-square wave signal output by the infrared emitting tube and the DC voltage signal output by the infrared receiving tube;

[0034] The detection control circuit performs a third execution operation, which includes controlling the detection control circuit to provide a square wave signal to the infrared emitting tube.

[0035] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0036] This invention provides an infrared detection system and method that can detect whether the infrared detection function of the system is abnormal. When an abnormality is detected, the system can also identify the specific component in the infrared detection system that is malfunctioning based on the different signal states of the processed signal. This assists in production line testing and locating the component's fault point, facilitating subsequent maintenance.

[0037] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0038] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0039] Figure 1 This is a functional block diagram of the infrared detection system of the present invention.

[0040] Figure 2 This is a functional block diagram of one form of the infrared detection system of the present invention.

[0041] Figure 3 This is a functional block diagram of another form of the infrared detection system of the present invention.

[0042] Figure 4 This is a schematic diagram of one installation method for the infrared emitting tube and infrared receiving tube of the present invention.

[0043] Figure 5 This is a schematic diagram of another installation method for the infrared emitting tube and infrared receiving tube of the present invention.

[0044] Figure 6 This is a flowchart of the infrared detection method of the present invention.

[0045] In the diagram: 10, infrared transmitter; 20, infrared receiver; 30, outer lid.

[0046] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0048] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] like Figures 1 to 3 As shown, an infrared detection system includes: an infrared emitting tube; and an infrared receiving tube, disposed opposite to the infrared emitting tube, for receiving infrared signals emitted by the infrared emitting tube.

[0052] A power amplifier circuit, connected to the infrared receiver tube, is used to amplify the infrared signal received by the infrared receiver tube to obtain a power amplified signal.

[0053] The signal processing circuit module is connected to the infrared emitting tube and the infrared receiving tube, and is used to collect and process the infrared signals output by the infrared emitting tube and the infrared signals output by the infrared receiving tube, and obtain the processed signal.

[0054] The detection control circuit is connected to the infrared emitting tube, the power amplifier circuit, and the signal processing circuit module, and is used to determine whether the infrared detection function of the infrared detection system is abnormal based on the power amplification signal and the processed signal.

[0055] The infrared signal emitted by the infrared emitter is received by the infrared receiver and amplified by a power amplifier circuit to obtain an amplified signal. This amplified signal is then transmitted to the detection and control circuit. When the detection and control circuit receives the amplified signal, it determines that the infrared detection function of the infrared detection system is normal, and both the infrared emitter and receiver are working properly. Installing the infrared detection system in a washing machine allows the machine to determine whether clothes are inside the drum using infrared detection.

[0056] When the detection control circuit does not receive the power amplified signal amplified by the power amplifier circuit, it is determined that the infrared detection function of the infrared detection system is abnormal. Then, by combining the infrared detection method, the specific component that is malfunctioning in the infrared detection system can be accurately identified, so as to assist the production line in testing and locating the component failure point, which is convenient for later maintenance.

[0057] As one implementation method, such as Figure 2 As shown, the signal processing circuit module includes a time-division multiplexing circuit and an ADC conversion circuit;

[0058] The time-division multiplexing circuit is connected to the infrared emitting tube and the infrared receiving tube, and the ADC conversion circuit is connected to the time-division multiplexing circuit and the detection and control circuit.

[0059] Specifically, the input of the time-division multiplexing circuit is connected to the infrared emitting tube and the infrared receiving tube, the output of the time-division multiplexing circuit is connected to the input of the ADC conversion module, and the output of the ADC conversion module is connected to the detection and control circuit.

[0060] In the above scheme, the infrared emitting tube and the infrared receiving tube can share a single ADC conversion circuit. The infrared signal output by the infrared emitting tube and the infrared signal output by the infrared receiving tube are transmitted to the ADC conversion circuit at different times using a time-division multiplexing circuit. Then, the ADC conversion module converts and processes the signal transmitted by the time-division multiplexing circuit and transmits the processed signal to the detection control circuit. This allows the detection control circuit to determine which component in the infrared detection system has malfunctioned when the infrared detection function is abnormal.

[0061] As another implementation method, such as Figure 3 As shown, the signal processing circuit module includes a first ADC conversion circuit and a second ADC conversion circuit;

[0062] The first ADC conversion circuit is connected to the infrared emitting tube and the detection control circuit, and the second ADC conversion circuit is connected to the infrared receiving tube and the detection control circuit.

[0063] In the above scheme, by using an ADC conversion circuit for each of the infrared emitting tube and the infrared receiving tube, and by acquiring the signals from the infrared emitting tube and the infrared receiving tube respectively through two ADC conversion circuits, the speed of signal transmission and conversion can be improved.

[0064] In some embodiments, the infrared signal emitted by the infrared emitting tube and the infrared signal received by the infrared receiving tube are both square wave signals with a specific frequency.

[0065] Preferably, both the infrared signal emitted by the infrared emitting tube and the infrared signal received by the infrared receiving tube are 500Hz square wave signals.

[0066] The present invention also provides a washing machine having any of the above-described infrared detection systems, comprising:

[0067] The outer barrel cover 30, the infrared emitting tube 10 and the infrared receiving tube 20 are respectively installed on the inner peripheral wall of the outer barrel cover 30;

[0068] Alternatively, it may include a tray base with a clothing loading port, wherein the infrared emitting tube and the infrared receiving tube are respectively installed on the side wall of the tray base facing the clothing loading port.

[0069] Preferably, the infrared emitting tube 10 and the infrared receiving tube 20 are both located on the same horizontal plane.

[0070] Furthermore, it also includes a circuit control board, which integrates the power amplifier circuit, the signal processing circuit module, and the detection and control circuit.

[0071] In some embodiments, the washing machine is equipped with at least one set of the infrared emitting tube 10 and the infrared receiving tube 20.

[0072] As one implementation method, such as Figure 4 As shown, a set of infrared emitting tubes 10 and infrared receiving tubes 20 are installed on the inner peripheral wall of the outer tub lid 30. The infrared emitting tubes and infrared receiving tubes are installed in a horizontal direction passing through the center line of the outer tub lid's inlet, which ensures that the infrared receiving tube can accurately receive the signal from the infrared emitting tube. Installing the infrared emitting tubes and infrared receiving tubes in a horizontal direction passing through the center line is for more accurate detection of the clothing dispensing action.

[0073] As another implementation scheme, such as Figure 5 As shown, two sets of infrared emitting tubes 10 and infrared receiving tubes 20 are installed on the inner peripheral wall of the outer tub lid 30. Since the infrared emitting tubes have a certain emission angle, in order to avoid the infrared detection system failing to detect smaller garments, multiple sets of infrared emitting tubes and infrared receiving tubes can be installed according to actual usage requirements.

[0074] Using a combination of multiple sets of infrared emitting tubes and infrared receiving tubes can improve the comprehensiveness and accuracy of infrared detection results.

[0075] It should be noted that at least one set of infrared emitting tubes and infrared receiving tubes can also be installed on the side wall of the tray facing the clothing inlet.

[0076] like Figure 6 As shown, an infrared detection method for the above-mentioned washing machine is also provided, comprising the following steps:

[0077] S1: After the washing machine is turned on, the detection control circuit detects whether the power amplification signal is received. If yes, it determines that the infrared detection function of the infrared detection system is normal. If no, it proceeds to step S2.

[0078] S2: The signal processing circuit module acquires and processes the infrared signal output by the infrared emitting tube and the infrared signal output by the infrared receiving tube, and obtains the processed signal; the detection and control circuit controls the execution of different operations according to the different signal states of the detected processed signal.

[0079] The signal processing circuit module may include a time-division multiplexing circuit and an ADC conversion circuit, or it may include two ADC conversion circuits.

[0080] Preferably, within 1 second of the washing machine being turned on, the detection and control circuit detects whether the power amplification signal is received. If the infrared detection function of the infrared detection system is abnormal, the signal processing circuit module collects and processes the infrared signal output by the infrared emitting tube and the infrared signal output by the infrared receiving tube, and obtains the processed signal. The detection and control circuit controls the execution of different operations according to the different signal states of the detected processed signal.

[0081] Furthermore, in step S2, both the infrared signal emitted by the infrared emitting tube and the infrared signal received by the infrared receiving tube are square wave signals with a specific frequency.

[0082] Preferably, both the infrared signal emitted by the infrared emitting tube and the infrared signal received by the infrared receiving tube are 500Hz square wave signals.

[0083] Furthermore, in step S2, the processing signal has a first signal state;

[0084] In the first signal state, the detection control circuit detects that the processed signal includes the square wave signal output by the infrared emitting tube and the square wave signal output by the infrared receiving tube.

[0085] The detection and control circuit performs a first execution operation, which is to detect a fault in the power amplifier circuit.

[0086] When the infrared detection function is abnormal, if the detection control circuit can detect the square wave signal output by the infrared emitting tube and the square wave signal output by the infrared receiving tube, but does not detect the square wave signal of the power amplifier, it can be determined that there is a fault in the power amplifier circuit.

[0087] Furthermore, in step S2, the processed signal has a second signal state;

[0088] In the second signal state, the detection control circuit detects that the processed signal includes the square wave signal output by the infrared emitting tube and the DC voltage signal output by the infrared receiving tube;

[0089] The detection control circuit performs a second execution operation, which includes detecting whether the infrared emitting tube and the infrared receiving tube are faulty, detecting whether the infrared emitting tube and the infrared receiving tube are on the same plane when they are arranged opposite each other, and prompting to clean at least one of the infrared emitting tube and / or the infrared receiving tube.

[0090] When the infrared detection function is abnormal, if the detection control circuit can only detect the square wave signal output by the infrared emitting tube, but does not detect the square wave signal output by the infrared receiving tube and the square wave signal of the power amplifier circuit, at least one of the following situations may occur: (1) The infrared emitting tube is faulty and cannot emit a square wave signal; (2) The infrared receiving tube is faulty and cannot receive the square wave signal emitted by the infrared emitting tube; (3) The infrared emitting tube and the infrared receiving tube are not on the same plane when they are set relative to each other, so that the infrared receiving tube does not receive the square wave signal emitted by the infrared emitting tube; (4) Neither the infrared emitting tube nor the infrared receiving tube is faulty, but the infrared emitting tube and / or the infrared receiving tube is dirty.

[0091] Furthermore, in step S2, the processing signal has a third signal state;

[0092] In the third signal state, the detection control circuit detects that the processed signal includes the non-square wave signal output by the infrared emitting tube and the DC voltage signal output by the infrared receiving tube;

[0093] The detection control circuit performs a third execution operation, which includes controlling the detection control circuit to provide a square wave signal to the infrared emitting tube.

[0094] When the infrared detection function is malfunctioning, if the detection control circuit fails to detect the square wave signal output by the infrared emitting tube, it may be that the infrared emitting tube is not receiving a signal source. In this case, it is necessary to remind the detection control circuit whether to provide a square wave signal to the infrared emitting tube.

[0095] The infrared detection method provided in the above technical solution can identify the specific faulty component in the infrared detection system based on the different signal states of the processed signal. This assists in production line testing and locating the fault point, facilitating subsequent repairs. It is understood that the washing machine's control panel can display fault codes under different fault states to alert the user.

[0096] The table below shows the different operation steps corresponding to different signal states in the infrared detection system:

[0097]

[0098] As shown in the table above, when the detection control circuit can detect the square wave signal output by the power amplifier circuit, it proves that the infrared detection function is normal. Then, the metal detection function of the washing machine can be turned on to determine whether there are any metal foreign objects in the clothes put into the washing machine drum.

[0099] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An infrared detection system, characterized in that, include: Infrared emitting tube; An infrared receiver tube, positioned opposite the infrared emitter tube, is used to receive the infrared signal emitted by the infrared emitter tube; a power amplifier circuit, connected to the infrared receiver tube, is used to amplify the infrared signal received by the infrared receiver tube to obtain a power amplified signal. The signal processing circuit module is used to collect and process the infrared signals output by the infrared emitting tube and the infrared signals output by the infrared receiving tube, and to obtain a processed signal. The detection and control circuit is connected to the infrared emitting tube and the infrared receiving tube through the signal processing circuit module to receive the processed signal; it is also connected to the infrared receiving tube through the power amplifier circuit to receive the power amplified signal; the detection and control circuit is used to determine the abnormal condition of any one of the three devices, namely the infrared emitting tube, the infrared receiving tube, and the power amplifier circuit, based on the power amplified signal and the processed signal. The signal processing circuit module includes: a time-division multiplexing circuit connected to the infrared emitting tube and the infrared receiving tube; and an ADC conversion circuit connected to the time-division multiplexing circuit and the detection and control circuit to convert the infrared signal into a processed signal.

2. The infrared detection system according to claim 1, characterized in that: The input terminal of the time-division multiplexing circuit is connected to the infrared emitting tube and the infrared receiving tube, the output terminal of the time-division multiplexing circuit is connected to the input terminal of the ADC conversion circuit, and the output terminal of the ADC conversion circuit is connected to the detection and control circuit.

3. An infrared detection system, characterized in that, include: Infrared emitting tube; An infrared receiver tube, positioned opposite the infrared emitter tube, is used to receive the infrared signal emitted by the infrared emitter tube; a power amplifier circuit, connected to the infrared receiver tube, is used to amplify the infrared signal received by the infrared receiver tube to obtain a power amplified signal. The signal processing circuit module is used to collect and process the infrared signals output by the infrared emitting tube and the infrared signals output by the infrared receiving tube, and to obtain a processed signal. The detection and control circuit is connected to the infrared emitting tube and the infrared receiving tube through the signal processing circuit module to receive the processed signal; it is also connected to the infrared receiving tube through the power amplifier circuit to receive the power amplified signal; the detection and control circuit is used to determine the abnormal condition of any one of the three devices, namely the infrared emitting tube, the infrared receiving tube, and the power amplifier circuit, based on the power amplified signal and the processed signal. The signal processing circuit module includes: a first ADC conversion circuit and a second ADC conversion circuit; the first ADC conversion circuit is connected to the infrared emitting tube and the detection control circuit, and the second ADC conversion circuit is connected to the infrared receiving tube and the detection control circuit.

4. A washing machine having an infrared detection system as described in any one of claims 1-3, characterized in that, include: The outer tub lid has an infrared emitting tube and an infrared receiving tube respectively installed on the inner peripheral wall of the outer tub lid; or it includes a tray base with a clothing inlet on the tray base, and the infrared emitting tube and the infrared receiving tube respectively installed on the side peripheral wall of the tray base facing the clothing inlet.

5. A washing machine according to claim 4, characterized in that, Also includes The circuit control board integrates the power amplifier circuit, the signal processing circuit module, and the detection and control circuit. The control panel displays fault codes for the infrared transmitter, infrared receiver, and power amplifier circuit under different fault conditions.

6. An infrared detection method applied to the washing machine of claim 5, characterized in that, Includes the following steps: S1: After the washing machine is turned on, the detection control circuit detects whether the power amplification signal is received. If yes, it determines that the infrared detection function of the infrared detection system is normal. If no, the infrared detection function is abnormal, and proceed to step S2. S2: The signal processing circuit module acquires and processes the infrared signal output by the infrared emitting tube and the infrared signal output by the infrared receiving tube, and obtains the processed signal; the detection and control circuit controls the execution of different operations according to the different signal states of the detected processed signal.

7. The infrared detection method according to claim 6, characterized in that: When the infrared detection function is normal, in step S2, the infrared signal emitted by the infrared emitting tube and the infrared signal received by the infrared receiving tube are both square wave signals with a specific frequency.

8. The infrared detection method according to claim 7, characterized in that: In step S2, the processed signal has a first signal state; In the first signal state, the detection control circuit detects that the processed signal includes the square wave signal output by the infrared emitting tube and the square wave signal output by the infrared receiving tube. Determine that there is a fault in the power amplifier circuit; The detection and control circuit performs a first execution operation, which is to detect a fault in the power amplifier circuit.

9. The infrared detection method according to claim 8, characterized in that: In step S2, the processed signal has a second signal state; In the second signal state, the detection control circuit detects that the processed signal includes the square wave signal output by the infrared emitting tube and the DC voltage signal output by the infrared receiving tube; The detection control circuit performs a second execution operation, which includes detecting whether the infrared emitting tube and the infrared receiving tube are faulty, detecting whether the infrared emitting tube and the infrared receiving tube are on the same plane when they are arranged opposite each other, and prompting to clean at least one of the infrared emitting tube and / or the infrared receiving tube.

10. An infrared detection method according to any one of claims 7-9, characterized in that: In step S2, the processing signal has a third signal state; In the third signal state, the detection control circuit detects that the processed signal includes the non-square wave signal output by the infrared emitting tube and the DC voltage signal output by the infrared receiving tube; The detection control circuit performs a third execution operation, which includes controlling the detection control circuit to provide a square wave signal to the infrared emitting tube.

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