Oil cup oil amount detection method and device and range hood

Abstract

The oil cup oil amount detection method, device and range hood provided by the present disclosure have the following beneficial effects. The oil cup is installed in the oil cup holder of the range hood, and the bottom of the oil cup in the oil cup holder is provided with a weighing induction device. The weighing induction device comprises a magnetic sensor and a magnetically conductive lifting top rod. A spring is arranged between the magnetically conductive lifting top rod and the magnetic sensor to separate the oil cup from the induction device, so that the induction device is not affected by oil stains, and the accuracy of oil cup oil amount detection can be improved. According to the induction signal of the weighing induction device, the state of the oil cup can be determined to ensure the timeliness of pouring the full oil cup.

Description

Technical Field

[0001] This disclosure relates to the field of range hood technology, and in particular to a method, device and range hood for detecting oil level in an oil cup. Background Technology

[0002] Range hoods are equipped with oil cups to collect cooking oil. Once the oil cups are full, users need to clean them promptly to prevent them from overflowing.

[0003] However, due to the heavy e-liquid concentration in the e-liquid cup, the sensor is easily damaged. Using a sensor to detect the e-liquid level in the cup not only fails to detect sensor damage but also carries the risk of e-liquid overflow. Existing technologies rely on simple methods such as motion, displacement, and pressure to detect the amount of e-liquid in the cup. Besides being inaccurate, these methods also struggle to avoid the influence of the heavy e-liquid environment on the sensor. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art in oil cup measurement, such as the lack of preparation and the failure to empty the oil cup in time when it is full, and to provide an oil cup oil level detection method, device and range hood.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] This disclosure provides a method for detecting the oil level in an oil cup, characterized in that a weighing sensing device is provided at the bottom of the oil cup, the weighing sensing device including a magnetic sensor and a movable magnetic rod, a spring being provided between the magnetic rod and the magnetic sensor, and the oil level detection method includes:

[0007] Obtain the sensing signal from the weighing sensor;

[0008] The state of the oil cup is determined based on the sensing signal.

[0009] Preferably, determining the state of the oil cup based on the sensing signal includes:

[0010] In response to the sensing signal being a positive single-amplitude vibration signal and the first parameter being less than a first preset threshold, the oil cup is determined to be in an empty state.

[0011] In response to the sensing signal being a positive single-amplitude vibration signal and the first parameter being greater than or equal to the first preset threshold, it is determined that the oil cup is in a missing state;

[0012] The first parameter is the amplitude or frequency of the induced signal; the positive single-amplitude vibration signal is a single-amplitude vibration signal whose amplitude is positive relative to the first reference line; the first reference line is the minimum value of the range.

[0013] Preferably, determining the oil level in the oil cup based on the sensing signal includes:

[0014] In response to the sensing signal being a negative single-amplitude vibration signal and the first parameter being greater than two preset thresholds, it is determined that the oil cup is full of oil.

[0015] In response to the sensing signal being a negative single-amplitude vibration signal, and the first parameter being less than or equal to the second preset threshold, it is determined that the oil cup is stuck or the sensor is malfunctioning.

[0016] The first parameter is the amplitude or frequency of the induced signal; the negative single-amplitude vibration signal is a single-amplitude vibration signal whose amplitude is negative relative to the second reference line; the second reference line is the maximum value of the range.

[0017] Preferably, in response to the sensing signal being a sinusoidal signal and the first parameter being greater than the second preset threshold, it is determined that the oil cup is in a normal state;

[0018] In response to the sensing signal being a sinusoidal signal and the first parameter being less than or equal to a second preset threshold, it is determined that the oil cup is stuck or the sensor is malfunctioning.

[0019] The sinusoidal signal is a sinusoidal signal relative to the third reference line, which is the average value of the induced signal.

[0020] Preferably, the step of determining that the oil cup is in a normal state further includes:

[0021] The amount of oil in the oil cup is calculated based on the sensing signal.

[0022] Preferably, the step of calculating the amount of oil in the oil cup based on the sensing signal includes,

[0023] Obtain the first parameter of the sensed signal;

[0024] Subtract the reference parameter to obtain the first parameter after calibration;

[0025] Calculate the amount of oil in the oil cup based on the calibrated first parameter;

[0026] The reference parameter is the first parameter of the sensing signal when the oil cup is missing, and the first parameter is the amplitude or frequency of the sensing signal.

[0027] This disclosure also provides an oil cup oil level detection device, characterized in that it comprises:

[0028] A weighing sensor is located below the oil cup; the weighing sensor includes a liftable magnetic rod, the top of which supports the oil cup, a magnetic sensor is located directly below the magnetic rod, and a spring is provided between the magnetic rod and the magnetic sensor;

[0029] Acquisition unit, used to acquire the sensing signal from the weighing sensing device;

[0030] The determination module is used to determine the state of the oil cup based on the sensing signal from the weighing sensor.

[0031] Preferably, the determining module further includes:

[0032] The first response module is used to determine that the oil cup is empty in response to the sensing signal being a positive single-amplitude vibration signal and the first parameter being less than a first preset threshold.

[0033] The second response module is used to determine that the oil cup is in a missing state in response to the sensing signal being a positive single-amplitude vibration signal and the first parameter being greater than or equal to the first preset threshold.

[0034] Preferably, the determining module further includes:

[0035] The third response module is used to determine that the oil cup is full of oil in response to the sensing signal being a negative single-amplitude vibration signal and the first parameter being greater than the second preset threshold.

[0036] The fourth response module is used to determine whether the oil cup is stuck or the sensor is abnormal in response to the sensing signal being a negative single-amplitude vibration signal and the first parameter being less than or equal to the second preset threshold.

[0037] Preferably, the determining module further includes:

[0038] The fifth response module is used to determine that the state of the oil cup is normal in response to the sensing signal being a sinusoidal signal and the first parameter being greater than the second preset threshold.

[0039] The sixth response module is used to determine whether the oil cup is stuck or the sensor is abnormal in response to the sensing signal being sinusoidal and the first parameter being less than or equal to the second preset threshold.

[0040] Preferably, the sixth response module further includes:

[0041] The calculation module, after determining that the oil cup is in a normal state, also includes calculating the amount of oil in the oil cup based on the sensing signal.

[0042] This disclosure also provides a range hood, which includes the oil cup and oil level detection device described in any of the above claims, wherein the oil cup is disposed in the oil cup holder, and the weighing sensor is disposed at the bottom wall of the oil cup holder.

[0043] Based on common knowledge in the field, the preferred conditions described can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0044] The positive and progressive effects of this invention are as follows:

[0045] The oil cup oil level detection method and apparatus provided in this invention have a weighing sensor at the bottom of the oil cup. The weighing sensor includes a magnetic sensor and a liftable magnetic rod. A spring is provided between the magnetic rod and the magnetic sensor to separate the oil cup from the sensor, so as to avoid the sensor being affected by oil stains and improve the accuracy of oil level detection. The state of the oil cup is determined according to the sensing signal of the weighing sensor to ensure that the oil cup is filled in a timely manner. Attached Figure Description

[0046] Figure 1 This is a flowchart of the oil cup oil level detection method according to Embodiment 1 of this disclosure;

[0047] Figure 2 This is a schematic diagram of an oil cup weighing assembly with an oil cup oil level detection device according to Embodiment 2 of this disclosure;

[0048] Figure 3 This is a schematic diagram of the oil cup oil level detection device according to Embodiment 2 of this disclosure;

[0049] Figure 4 This is a partial structural diagram of the oil cup holder in the range hood with the above-mentioned oil cup oil quantity detection device according to Embodiment 3 of this disclosure;

[0050] Figure 5 This is a schematic diagram of the weighing sensor in the range hood with the oil cup oil quantity detection device described above, according to Embodiment 3 of this disclosure. Detailed Implementation

[0051] The present disclosure is further illustrated below by way of embodiments, but is not intended to limit the scope of the embodiments.

[0052] Example 1

[0053] This embodiment provides a method for detecting the oil level in an oil cup, such as...

[0054] Figure 1 As shown, a weighing sensor is installed at the bottom of the oil cup. The weighing sensor includes a magnetic sensor and a movable magnetic rod. A spring is provided between the magnetic rod and the magnetic sensor. The oil level detection method of the oil cup includes:

[0055] S101. Obtain the sensing signal from the weighing sensor;

[0056] S102. Determine the state of the oil cup based on the sensing signal.

[0057] The vibration of the oil level detection device will be transmitted to the spring of the oil level detection device, resulting in the spring compression index. The amplitude of the vibration is inversely proportional to the spring compression. Therefore, the lighter the weight of the object pressing on the spring, the greater the vibration amplitude. In other words, the less oil in the oil cup, the greater the vibration amplitude.

[0058] Based on the different oil levels in the oil cup, the sensing signal from the weighing sensor can be used to determine the state of the oil cup.

[0059] Based on the amplitude, we can determine the amplitude as follows: amplitude when the oil cup is missing > amplitude when the oil cup is empty > amplitude when the oil cup is in a normal state > amplitude when the oil cup is full > amplitude when the oil cup is stuck or the sensor is malfunctioning.

[0060] The induced signal can be either an amplitude signal or a frequency signal.

[0061] In one feasible approach, the state of the oil cup is determined based on a sensing signal, including:

[0062] In response to the sensing signal being a positive single-amplitude vibration signal and the first parameter being less than the first preset threshold, it is determined that the oil cup is in an empty state.

[0063] In response to the sensing signal being a positive single-amplitude vibration signal and the first parameter being greater than or equal to the first preset threshold, it is determined that the oil cup is in a missing state;

[0064] The first parameter is the amplitude or frequency of the induced signal; the positive single-amplitude vibration signal is a single-amplitude vibration signal whose amplitude is positive relative to the first reference line; the first reference line is the minimum value of the range.

[0065] The sensing signal contains parameter information, including amplitude or frequency, and a first preset threshold is preset. If there is a positive single-amplitude vibration signal and the first parameter is less than the first preset threshold, the oil cup is determined to be empty. If there is a positive single-amplitude vibration signal and the first parameter is greater than or equal to the first preset threshold, the oil cup is determined to be missing.

[0066] Because there is a limit on the oil level detection device when the oil cup is empty or full, the spring in the oil level detection device will only vibrate upwards. Therefore, when the oil cup is empty or full, the induced signal is a positive single-amplitude vibration signal.

[0067] In one feasible solution, the oil level in the oil cup is determined based on a sensing signal, including:

[0068] In response to the sensing signal being a negative single-amplitude vibration signal and the first parameter being greater than the second preset threshold, it is determined that the oil cup is full of oil.

[0069] In response to the sensing signal being a negative single-amplitude vibration signal, and the first parameter being less than or equal to the second preset threshold, it is determined that the oil cup is stuck or the sensor is malfunctioning.

[0070] The first parameter is the amplitude or frequency of the induced signal; the negative single-amplitude vibration signal is a single-amplitude vibration signal whose amplitude is negative relative to the second reference line; the second reference line is the maximum value of the range.

[0071] The presence of a negative single-amplitude vibration signal in the sensing signal indicates that the oil cup is stuck, the sensor is malfunctioning, or the oil cup is full. The specific distinction depends on the magnitude of the parameters.

[0072] If the sensing signal is a negative single-amplitude vibration signal and the first parameter is greater than the second preset threshold, it is determined that the oil cup is full of oil. If the sensing signal is a negative single-amplitude vibration signal and the first parameter is less than or equal to the second preset threshold, it is determined that the oil cup is stuck or the sensor is abnormal.

[0073] In one feasible solution, the oil level in the oil cup is determined based on a sensing signal, including:

[0074] In response to the sensing signal being a sinusoidal signal and the first parameter being greater than the second preset threshold, it is determined that the oil cup is in normal condition;

[0075] In response to the sensing signal being a sinusoidal signal and the first parameter being greater than the second preset threshold, it is determined that the oil cup is in normal condition;

[0076] A sinusoidal signal is a signal that is a sinusoidal wave relative to the third reference line, which is the average value of the induced signal.

[0077] There is a third baseline based on the average value of the sensed signal. The sensed signal relative to the third baseline is a sinusoidal signal wave. When the sensed signal is a sinusoidal signal and the first parameter is greater than the second preset threshold, it is determined that the oil cup is in normal condition.

[0078] In a feasible solution, the steps after confirming that the oil cup is in a normal state also include:

[0079] After confirming that the oil cup is in normal condition, the process also includes calculating the amount of oil in the oil cup based on the sensor signal.

[0080] After confirming that the oil cup is in normal condition, the amount of oil in the oil cup is calculated based on the signal of the first parameter.

[0081] The amount of oil in the oil cup is calculated based on the first parameter signal, specifically including...

[0082] Obtain the first parameter of the sensed signal;

[0083] Subtract the reference parameter to obtain the first parameter after calibration;

[0084] Calculate the amount of oil in the oil cup based on the calibrated first parameter;

[0085] The reference parameter is the first parameter of the sensing signal when the oil cup is missing, and the first parameter is the amplitude or frequency of the sensing signal.

[0086] When the first parameter is frequency, the specific calculation formula is as follows: f is the natural frequency of the spring in the weighing sensor, k is the spring stiffness coefficient, and m is the equivalent mass, i.e., the weight of the spring plus the weight of the object it carries.

[0087] When the first parameter is amplitude, the magnitude of the amplitude is inversely proportional to the weight of the object on the weighing sensor.

[0088] a = E / F, where E is the vibrational energy and F is the weight of the object.

[0089] By pre-calibrating the weight of a full oil cup and the vibration energy of an empty cup, and calculating the corresponding amplitude in advance, the amount of oil in the cup under normal conditions can be obtained.

[0090] The oil level detection method provided in this embodiment can minimize the impact of oil contamination on oil level detection, and can measure various states of the oil cup such as full, empty, and stuck based on the sensing signal, ensuring accurate identification of the oil level and timely emptying of a full oil cup.

[0091] Example 2

[0092] This embodiment provides an oil cup oil level detection device, which includes:

[0093] A weighing sensor is located below the oil cup; the weighing sensor 3 includes a magnetic rod 31 that can be raised and lowered, the top of the magnetic rod supports the oil cup 1, a magnetic sensor is located directly below the magnetic rod, and a spring is provided between the magnetic rod 31 and the magnetic sensor.

[0094] Acquisition unit, used to acquire the sensing signal from the weighing sensing device;

[0095] The determination module is used to determine the state of the oil cup based on the sensing signal from the weighing sensor.

[0096] In this technical solution, such as Figure 2The oil cup weighing assembly includes the aforementioned weighing sensing device. This assembly comprises an oil cup 1, an oil cup holder 2, and a weighing sensing device 3. The weighing sensing device is located on the bottom wall of the oil cup holder 2, below the oil cup 1. The weighing sensing device 3 includes a movable magnetic rod 31. The top of the magnetic rod 31 supports the oil cup 1. A magnetic sensor is located directly below the magnetic rod 31. When the oil volume in the oil cup 1 increases, it causes the magnetic rod 31 to move downwards. The magnetic rod 31 moves vertically within the magnetic sensor, reflecting the weight change of the oil cup 1 and the oil within it in the length of the magnetic rod 31 within the magnetic sensor's receiving portion. By establishing a correspondence between the length of the magnetic rod 31 and the change in the magnetic sensor's sensing signal, the purpose of detecting the weight change of the oil cup 1 and the oil within it is achieved.

[0097] This control system can accurately measure the amount of oil in the oil cup by measuring changes in the magnetic field, and makes the weight change of the oil in the oil cup more quickly and accurately reflected on the weighing sensor.

[0098] The acquisition unit acquires the sensing signal from the weighing sensor, which is the sensing signal from the magnetic sensor 32. The determination module is used to determine the state of the oil cup based on the sensing signal.

[0099] To improve detection accuracy, calibration settings can be configured to calibrate the oil cup 1 in both oil-free and oil-full states, and store the results in the weight sensing control system. The calibration for the oil-full state can be performed using a counterweight of the same weight as the oil-full state.

[0100] In a feasible solution, such as Figure 3 The determining module 200 further includes:

[0101] The first response module 201 is used to determine that the oil cup is empty in response to the sensing signal being a positive single-amplitude vibration signal and the first parameter being less than the first preset threshold.

[0102] The second response module 202 is used to determine that the oil cup is missing in response to the sensing signal being a positive single-amplitude vibration signal and the first parameter being greater than or equal to the first preset threshold.

[0103] In a feasible solution, the determination module also includes:

[0104] The third response module 203 is used to determine that the oil cup is full of oil in response to the sensing signal being a negative single-amplitude vibration signal and the first parameter being greater than the second preset threshold.

[0105] The fourth response module 204 is used to determine whether the oil cup is stuck or the sensor is abnormal in response to the sensing signal being a negative single-amplitude vibration signal and the first parameter being less than or equal to the second preset threshold.

[0106] In a feasible solution, the determination module also includes:

[0107] The fifth response module 205 is used to determine that the oil cup is in normal condition in response to the sensing signal being a sinusoidal signal and the first parameter being greater than the second preset threshold.

[0108] The sixth response module 206 is used to determine whether the oil cup is stuck or the sensor is abnormal in response to the sensing signal being a sinusoidal signal and the first parameter being less than or equal to the second preset threshold.

[0109] In one feasible solution, the sixth response module also includes:

[0110] The calculation module, after determining that the oil cup is in a normal state, also includes calculating the amount of oil in the oil cup based on the sensing signal.

[0111] Example 3

[0112] This embodiment provides a range hood with the aforementioned oil cup oil level detection device. The range hood includes the aforementioned oil cup weighing component, such as... Figure 2 , 4 Figure 5 shows a schematic diagram of the oil cup weighing component of a range hood that includes the aforementioned oil cup oil level detection device. This embodiment discloses the specific structure of the weighing sensing device.

[0113] The oil cup weighing assembly includes an oil cup 1, an oil cup holder 2, and a weighing sensor 3. The weighing sensor is located on the bottom wall of the oil cup holder 2, below the oil cup 1. The weighing sensor 3 includes a liftable magnetic rod 31. The top of the magnetic rod supports the oil cup 1. A magnetic sensor is located directly below the magnetic rod. When the oil in the oil cup 1 increases, it will drive the magnetic rod 31 to move down, so that the weight of the oil cup 1 is reflected in the weighing sensor 3.

[0114] Six spring pieces 4 are evenly distributed on the inner peripheral sidewall 21 of the oil cup holder 2. Each spring piece 4 is arranged vertically, and its upper end is connected to the inner peripheral sidewall 21 of the oil cup holder 2. By providing spring pieces 4 and a roller 41 at the lower end of the spring pieces 4, the spring pieces 4 spring away the roller 41 from the inner peripheral sidewall 41 of the oil cup holder 2, thereby reducing the contact area between the oil cup 1 and the oil cup holder 2 and preventing the sidewall of the oil cup 1 from adhering to the oil cup holder 2 due to the tension of the oil on the outer surface. By providing a roller 41 at the end of the spring piece 4, and the roller 41 being able to roll vertically, the friction between the oil cup holder 2 and the oil cup 1 is changed to rolling friction, so that the weight change of the oil in the oil cup 1 is reflected more quickly and accurately on the weighing sensing device 3. Of course, in other embodiments, the number of spring pieces 4 can be set to three or more.

[0115] By setting the oil cup holder 2 to be open at the top to accommodate the oil cup 1, six spring pieces 4 are evenly distributed on the inner peripheral sidewall 21 surface of the oil cup holder 2. Each spring piece 4 is arranged vertically, and its upper end is connected to the inner peripheral sidewall 21 of the oil cup holder 2. A spherical part 42 is provided on the bent part, wherein the spherical part 42 can be a roller. The spring piece 4 springs the spherical part 42 away from the inner peripheral sidewall 21 of the oil cup holder 2 to reduce the contact area between the oil cup 1 and the oil cup holder 2, and to prevent the sidewall of the oil cup 1 from adhering to the oil cup holder 2 due to the oil tension on the outer surface. The upper end of the spring piece has a fixing part 43, which is used to fix the spring piece to the inner wall of the oil cup holder, wherein the fixing part 43 can be a rivet.

[0116] Thus, by forming a bent portion 42 at the lower end of the spring piece 4 in a folded manner for rotatable connection with the roller 41, and having corresponding through holes 43 on the two bent portions 42, with the two ends of the roller 41's axle respectively disposed within the through holes 43, a relatively simple structural implementation is provided. This achieves the purpose of setting the roller 41 at the lower end of the spring piece 4 with relatively low cost and simple process. Of course, in other embodiments, the roller 41 can also be connected to the spring piece 4 through other structures.

[0117] In a feasible solution, such as Figure 5 The weighing sensing device 3 also includes a hollow inductor 32 and an elastic element. The hollow inductor 32 has an inwardly recessed receiving portion 321 at the top center, which is used to receive the magnetic push rod 31. An elastic element is provided between the magnetic push rod 31 and the bottom wall of the receiving portion 321 in the vertical direction.

[0118] In this way, the magnetic push rod 31 moves vertically inside the hollow inductor 32 so that the weight change of the oil cup 1 and the oil in the oil cup 1 is reflected in the length of the magnetic push rod 31 entering the receiving part 321 of the hollow inductor 32. By having a corresponding relationship between the length of the magnetic push rod 31 and the amount of inductance change, the purpose of detecting the weight change of the oil cup 1 and the oil in the oil cup 1 is achieved.

[0119] The hollow inductor 32 is electrically connected to the outside world via lead wire 35. Compared with other weighing sensors 3 that detect weight, the measurement method using the hollow inductor 32 is more accurate and reliable. In this embodiment, the magnetic guide rod 31 is made of silicon steel; in other embodiments, the magnetic guide rod 31 can also be made of other magnetic materials such as ferrite.

[0120] In one feasible embodiment, the oil level detection device for the oil cup also includes a protective film 34, which covers the top surface of the hollow inductor and wraps around the magnetic push rod 31. The protective film 34 is used to separate the magnetic push rod 31 from the oil cup 1.

[0121] In this way, by setting the weighing sensor 3 to also include a silicone rubber membrane 34, the silicone rubber membrane 34 covers the top surface of the hollow inductor 32, and the silicone rubber membrane 34 wraps downward around the magnetic guide rod 31, the magnetic guide rod 31 is separated from the oil cup 1, so as to prevent oil from entering the interior of the weighing sensor 3 and also to prevent water vapor corrosion.

[0122] The protective film 31 can be a silicone film or a film made of rubber or other materials that can be used to separate the magnetic rod 31 from the oil cup 1. In this way, by providing a range hood that includes the oil cup weighing component as described above, it is possible to prevent the side wall of the oil cup 1 from adhering to the oil cup holder 2 due to frictional resistance and oil tension, so that the weight change of the oil in the oil cup 1 can be reflected more quickly and accurately on the weighing sensing device 3.

[0123] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A method for detecting the oil level in an oil cup, characterized in that, The bottom of the oil cup is equipped with a weighing sensor, which includes a magnetic sensor and a movable magnetic rod. A spring is provided between the magnetic rod and the magnetic sensor. The oil level detection method of the oil cup includes: Obtain the sensing signal from the weighing sensor; The state of the oil cup is determined based on the sensing signal; Determining the state of the oil cup based on the sensed signal includes: In response to the sensing signal being a positive single-amplitude vibration signal and the first parameter being less than a first preset threshold, the oil cup is determined to be in an empty state. In response to the sensing signal being a positive single-amplitude vibration signal and the first parameter being greater than or equal to the first preset threshold, it is determined that the oil cup is in a missing state; The first parameter is the amplitude or frequency of the induced signal; the positive single-amplitude vibration signal is a single-amplitude vibration signal whose amplitude is positive relative to the first reference line; the first reference line is the minimum value of the range; In response to the sensing signal being a negative single-amplitude vibration signal and the first parameter being greater than the second preset threshold, it is determined that the oil cup is full of oil. In response to the sensing signal being a negative single-amplitude vibration signal, and the first parameter being less than or equal to the second preset threshold, it is determined that the oil cup is stuck or the sensor is malfunctioning. The negative single-amplitude vibration signal is a single-amplitude vibration signal whose amplitude is negative relative to the second reference line; the second reference line is the maximum value of the range.

2. The oil level detection method for an oil cup according to claim 1, characterized in that, Determining the oil level in the oil cup based on the sensing signal includes: In response to the sensing signal being a sinusoidal signal and the first parameter being greater than the second preset threshold, it is determined that the oil cup is in a normal state. In response to the sensing signal being a sinusoidal signal and the first parameter being less than or equal to a second preset threshold, it is determined that the oil cup is stuck or the sensor is malfunctioning. The sinusoidal signal is a sinusoidal signal relative to the third reference line, which is the average value of the induced signal.

3. The oil level detection method for an oil cup according to claim 2, characterized in that, The steps following the determination that the oil cup is in a normal state also include: The amount of oil in the oil cup is calculated based on the sensing signal.

4. The oil level detection method for an oil cup according to claim 3, characterized in that, The step of calculating the amount of oil in the oil cup based on the sensing signal includes, Obtain the first parameter of the sensed signal; Subtract the reference parameter to obtain the first parameter after calibration; Calculate the amount of oil in the oil cup based on the calibrated first parameter; The reference parameter is the first parameter of the sensing signal when the oil cup is missing, and the first parameter is the amplitude or frequency of the sensing signal.

5. An oil cup oil level detection device, characterized in that, It includes: A weighing sensor located below the oil cup; The weighing sensing device includes a magnetically guided rod that can be raised and lowered. The top of the magnetically guided rod supports the oil cup. A magnetic sensor is located directly below the magnetically guided rod. A spring is provided between the magnetically guided rod and the magnetic sensor. Acquisition unit, used to acquire the sensing signal from the weighing sensing device; The determination module is used to determine the state of the oil cup based on the sensing signal from the weighing sensor. The first response module is used to determine that the oil cup is empty in response to the sensing signal being a positive single-amplitude vibration signal and the first parameter being less than a first preset threshold. The second response module is used to determine that the oil cup is missing in response to the sensing signal being a positive single-amplitude vibration signal and the first parameter being greater than or equal to the first preset threshold. The first parameter is the amplitude or frequency of the induced signal; the positive single-amplitude vibration signal is a single-amplitude vibration signal whose amplitude is positive relative to the first reference line; the first reference line is the minimum value of the range; The third response module is used to determine that the oil cup is full of oil in response to the sensing signal being a negative single-amplitude vibration signal and the first parameter being greater than the second preset threshold. The fourth response module is used to determine whether the oil cup is stuck or the sensor is abnormal in response to the sensing signal being a negative single-amplitude vibration signal and the first parameter being less than or equal to the second preset threshold. The negative single-amplitude vibration signal is a single-amplitude vibration signal whose amplitude is negative relative to the second reference line; the second reference line is the maximum value of the range.

6. The oil level detection device for an oil cup according to claim 5, characterized in that, It includes: The fifth response module is used to determine that the state of the oil cup is normal in response to the sensing signal being a sinusoidal signal and the first parameter being greater than the second preset threshold. The sixth response module is used to determine whether the oil cup is stuck or the sensor is abnormal in response to the sensing signal being sinusoidal and the first parameter being less than or equal to the second preset threshold.

7. A range hood, characterized in that, It includes an oil cup oil level detection device as described in any one of claims 5-6, wherein the oil cup is disposed inside an oil cup holder, and the weighing sensor is disposed at the bottom wall of the oil cup holder.

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