Pet excrement collection device and odor regulation and control method thereof

Abstract

The invention relates to a pet excrement collection device and an odor regulation and control method thereof. The pet excrement collection device comprises a smell detection unit, a trigger unit, an execution unit and an alarm unit. The olfaction detection unit is used for detecting the concentration gradient of volatile organic compounds and characteristic malodorous substances in the collection basin main body in real time; the trigger unit compares the received concentration gradient with a preset concentration threshold value, identifies an execution mode based on a comparison result and sends a trigger instruction to the execution unit; under the condition that timing reaches verification time after execution of the execution unit is finished, the concentration gradient updated at the verification time is compared with the preset concentration threshold value again, and under the condition that the updated concentration gradient is higher than the preset concentration threshold value, a trigger instruction is sent to the alarm unit; the execution unit responds to a trigger instruction which is sent by the trigger unit and corresponds to the execution mode and executes an exhaust mode and / or an overturning masking mode, and the alarm unit responds to the received trigger instruction and sends out alarm information.

Description

Technical Field

[0001] The present invention relates to the technical field of pet products, and in particular to a pet excrement collection device and an odor control method thereof. Background Art

[0002] With the acceleration of urbanization and the improvement of people's living standards, the practice of keeping pets in households is becoming increasingly common. Pet types have also expanded from traditional cats and dogs to hamsters, guinea pigs, rabbits, birds, and reptiles (such as lizards and turtles). While pets provide companionship and enjoyment, the management of their waste is also a growing concern. To maintain a clean and hygienic home environment, pet waste collection devices have become an important research area in the pet products field.

[0003] Currently, there are a variety of waste collection devices designed for different pets on the market. For example, cats are widely used with litter boxes, which are typically made of plastic and filled with absorbent materials to absorb urine and mask fecal odors. In recent years, smart products such as self-cleaning litter boxes and enclosed deodorizing litter boxes have also gradually entered the market.

[0004] For canine pets, since dogs usually defecate outdoors, dogs raised in apartments or high-rise buildings, especially small dogs, often use indoor urine collectors or training pads. Some devices simulate outdoor grassy environments to help dogs adapt.

[0005] For rodent pets (such as hamsters, guinea pigs, rabbits, etc.), the bottom of the cage is usually equipped with a waste collection tray for easy cleaning. Some products adopt a detachable design to facilitate the replacement of cleaning materials.

[0006] For reptiles (such as turtles and lizards), since they defecate less frequently, the method of collecting excrement is usually to regularly change the bedding or set up an isolated excretion area. Some high-end reptile enclosures have a pull-out excretion chute or a structure designed for easy cleaning.

[0007] Furthermore, with the recent development of smart home appliances, pet waste collection devices with automatic cleaning, deodorization, sterilization, and humidity sensing functions have also emerged. For example, these devices automatically clean waste after using sensors to identify pets, or use activated carbon, ultraviolet light, and other methods to deodorize and sterilize, improving user experience and hygiene.

[0008] Although there are many pet excrement collection devices in the prior art, most products still have problems such as single function, inconvenient cleaning, and limited application range. Therefore, there is an urgent need for an excrement collection device with a reasonable structure, easy use, and applicable to various types of pets to meet the increasingly diverse needs of pet breeding.

[0009] Taking cat litter boxes as an example, traditional cat litter boxes have significant technical defects in the field of odor control. Existing products mainly rely on manual cleaning by users or the use of periodic mechanical feces shoveling devices. This type of passive treatment mode cannot perceive the odor components produced by the decomposition of excrement (such as ammonia, hydrogen sulfide, methyl mercaptan and other volatile organic compounds) in real time, resulting in the continuous accumulation of odor in a closed environment. Although some improved products have integrated timed exhaust systems, their operating logic is only based on fixed time intervals and cannot dynamically adjust the exhaust intensity and duration according to the actual odor concentration. There are dual problems of energy waste and low cleaning efficiency.

[0010] Existing technologies generally use a single-shot gas detection mechanism, whose detection results are easily affected by fluctuations in ambient temperature and humidity, uneven gas diffusion, or transient sensor errors, resulting in a high rate of misjudgment. For example, a single detection may trigger a false alarm due to the brief stirring of the adsorbent material (cat litter) that raises dust, or the actual odor exceeding the standard may not be identified due to insufficient local concentration sampling. In addition, the lack of the collaborative analysis capabilities of multi-component olfactory chips makes it difficult to distinguish the superposition effect of different odorous substances, resulting in inaccurate odor threshold determination.

[0011] There is currently no intelligent solution on the market that can dynamically analyze the concentration of odor components through multi-sensor fusion technology, correct the control strategy based on a secondary detection and verification mechanism, and link flip covering, variable frequency exhaust and graded alarms.

[0012] For example, CN116098069A discloses a device and method for removing cat excrement and odor from cat litter. The method includes a sealing member closing the first opening of the device; a rotatable chamber rotating from an initial position in a first direction, opening a second opening, and loading cat litter containing cat excrement into a screen; the screen discharges the cat excrement through the second opening, and the cat litter is sifted out; the rotatable chamber rotates in a direction opposite to the first direction, returning the sifted cat litter while closing the second opening; air fluid enters the rotatable chamber through a third opening, and the fourth opening discharges the air fluid from the rotatable chamber. However, this technical solution only provides a deodorizing device, relying on the unidirectional flow of air fluid after the cavity rotates for deodorization. Therefore, there is a lack of concentration monitoring of key odor components such as ammonia and hydrogen sulfide, resulting in the exhaust system being unable to adjust the air volume according to the actual odor intensity, posing the dual risks of continuous idling and energy consumption or incomplete deodorization.

[0013] CN107182799A discloses a cat litter box, including a cat litter box body, which includes a chassis and an upper cover. The upper cover is provided with an opening, and a door is provided in the opening. An odor sensor, a deodorizing device, an ozone generator, an ozone concentration sensor, and a controller are provided inside the upper cover. The odor sensor is used to detect the odor gas concentration signal of cat excrement in the cat litter box, and the operation of the deodorizing device and the ozone generator are controlled by the controller. The ozone concentration sensor is used to detect the concentration of ozone in the cat litter box. When the ozone concentration in the cat litter box drops to a certain concentration, the controller controls the opening of the door. In this scheme, the ozone concentration is only detected once and the corresponding control operation is implemented. When there is an instantaneous concentration fluctuation (such as dust raised by cat litter turning over, resulting in an artificially high detection value), the system will release excessive ozone. The curvature of the cat's nasal cavity (150°) prolongs the ozone residence time to 2.3 times that of humans, which will reduce the frequency of ciliary movement of the cat's nasal mucosa, significantly reduce the secretion of alveolar surfactant, and increase the incidence of respiratory distress. This technical solution is not conducive to the health of cats.

[0014] Therefore, how to accurately determine the odor concentration of the adsorption material and provide operations corresponding to the concentration of the secondary detection so that the adsorption material can reduce exposure to the odor source, especially avoid ineffective continuous exhaust, is a technical problem that has not yet been solved.

[0015] In addition, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the applicant studied a large number of documents and patents when making the present invention, but due to space limitations, not all details and contents are listed in detail. However, this does not mean that the present invention does not have the characteristics of these prior arts. On the contrary, the present invention already has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art to the background technology. Summary of the Invention

[0016] With the increasing prevalence of pet ownership, managing pet waste has become a significant issue for pet owners. While cat litter boxes are currently available on the market, waste collection devices for pets such as dogs, rodents, and reptiles are relatively limited, and a unified technical solution is lacking. The present invention provides a highly versatile and adaptable pet waste collection device that can meet the needs of a wide range of pets.

[0017] Existing technologies generally use a single-shot gas detection mechanism, whose detection results are easily affected by fluctuations in ambient temperature and humidity, uneven gas diffusion, or transient sensor errors, resulting in a high rate of misjudgment. For example, a single detection may trigger a false alarm due to the brief stirring of the adsorbent material (cat litter) that raises dust, or the actual odor exceeding the standard may not be identified due to insufficient local concentration sampling. In addition, the lack of the collaborative analysis capabilities of multi-component olfactory chips makes it difficult to distinguish the superposition effect of different odorous substances, resulting in inaccurate odor threshold determination.

[0018] In response to the shortcomings of the prior art, the present invention provides, from a first aspect, a pet excrement collection device, comprising an olfactory detection unit, a trigger unit, an execution unit, and an alarm unit. The olfactory detection unit is used to detect the concentration gradient of volatile organic compounds and characteristic malodorous substances in the collection basin body in real time; the trigger unit compares the received concentration gradient with a preset concentration threshold, identifies an execution mode based on the comparison result, and sends a trigger instruction to the execution unit; when the timing after the execution of the execution unit reaches the verification time, the concentration gradient updated at the verification time is compared again with the preset concentration threshold, and if the updated concentration gradient is higher than the preset concentration threshold, a trigger instruction is sent to the alarm unit; the execution unit executes the exhaust mode and / or the flip masking mode in response to the trigger instruction corresponding to the execution mode sent by the trigger unit, and the alarm unit issues an alarm message in response to the received trigger instruction.

[0019] By combining the olfactory detection unit's real-time gradient monitoring with the trigger unit's secondary verification mechanism, combined with a post-execution concentration reverification process, this invention effectively reduces the risk of misjudgment in single tests. The verification time window captures the stable concentration state after gas diffusion, addressing missed detections caused by local sampling bias and significantly improving detection reliability.

[0020] According to a preferred embodiment, the olfactory detection unit includes gas sensors positioned at different locations within the collection basin. These sensors collect concentration gradients of volatile organic compounds (VOCs) and characteristic malodorous substances within the basin and transmit these gradients to the trigger unit in a time-dependent manner. This multi-directional distributed array of gas sensors forms a spatial sampling network. Through multi-directional data fusion, it eliminates azimuthal bias associated with single-point detection, achieving comprehensive perception of the spatial distribution of VOCs, improving detection accuracy and suppressing transient interference.

[0021] According to a preferred embodiment, the trigger unit calculates the coordinates of the odor source within the adsorbent material based on the concentration gradient differences transmitted by the gas sensor. Based on the odor source coordinates, the trigger unit then calculates an exhaust path formed by the air outlet angle and the exhaust outlet angle, ensuring that the exhaust path covers the area where the odor source coordinates are located. A spatial resolution algorithm based on gradient differences precisely locates the odor source, and this, combined with a dynamically adjusted exhaust path, creates a directional airflow field, significantly improving gas replacement efficiency in the target area and reducing the volume of residual gas.

[0022] According to a preferred embodiment, the triggering unit calculates the wind speed of the exhaust mode based on the modulus of the concentration gradient, which is the amplitude of the concentration gradient vector detected at the odor source's location coordinates. This dynamic mapping model between the modulus of the concentration gradient and wind speed enables adaptive exhaust control, optimizing energy utilization while ensuring deodorization efficiency, avoiding the energy waste associated with traditional fixed-speed exhaust.

[0023] According to a preferred embodiment, the trigger unit performs temperature and humidity compensation on the received concentration gradient before comparison. This compensated concentration gradient is then compared with a preset concentration threshold to improve comparison accuracy. The introduction of an environmental parameter compensation algorithm effectively mitigates the impact of temperature and humidity fluctuations on sensor accuracy, improving the accuracy of characteristic malodorous substance concentration detection and reducing the probability of false positives.

[0024] According to a preferred embodiment, the triggering condition for the flip masking mode includes: when the concentration of a characteristic malodorous substance in the concentration gradient exceeds a preset concentration threshold, the flip masking mode is preferentially triggered. By prioritizing the response strategy for characteristic malodorous substances, the present invention shortens the activation time of the physical masking action and significantly suppresses the diffusion rate of malodorous gases by quickly blocking the release path of volatile substances.

[0025] According to a preferred embodiment, the flip masking unit that performs flip masking mode includes a rotating shovel and a vibrating component. If the location coordinates of the odor source remain unchanged for a set period of time, a triggering unit initiates a pattern of alternating motion between the rotating shovel and the vibrating component. After the rotating shovel performs a fan-shaped trajectory to bury the excrement, the vibrating component compacts the burial area by vibrating the adsorbed material. This coordinated operation optimizes the pore structure of the adsorbed material, increasing the depth and density of fecal burial, effectively blocking the continued release of volatile organic compounds.

[0026] According to a preferred embodiment, when the updated concentration gradient is compared against the preset concentration threshold, the trigger unit uses a sliding window algorithm to perform trend analysis on the updated concentration gradient. If the trend shows a continued upward trend, a trigger instruction is directly sent to the alarm unit. Using a dynamic sliding window algorithm for concentration trend analysis can identify progressive contamination processes in advance, providing early warning and avoiding the response lag associated with traditional fixed-duration verification mechanisms.

[0027] According to a preferred embodiment, when the trigger unit generates a trigger command after the first comparison of the concentration gradient with the preset concentration threshold, it simultaneously starts a delay timer. If the concentration gradient falls below the preset concentration threshold during the delay period, the trigger command is canceled to prevent false triggers caused by transient changes in the concentration gradient. The dynamic delay judgment window effectively filters out transient interference signals, significantly reducing the frequency of false triggers while ensuring the capture rate of true odor events.

[0028] The present invention, in its second aspect, provides an odor control method for a pet excrement collection device. The method comprises: real-time detection of the concentration gradient of volatile organic compounds and characteristic malodorous substances within the collection basin body; comparing the received concentration gradient with a preset concentration threshold, identifying an execution mode based on the comparison result, and executing an exhaust mode and / or a flip masking mode; and, if the timer after the execution mode ends reaches the verification time, comparing the concentration gradient updated at the verification time with the preset concentration threshold again. If the updated concentration gradient exceeds the preset concentration threshold, an alarm is issued. By establishing a closed-loop odor control mechanism through dual-stage concentration verification and multi-mode coordinated control, the system improves odor elimination efficiency and operational reliability, while reducing user maintenance requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of the pet excrement collection device provided by the present invention;

[0030] Figure 2 is a simplified structural diagram of the rotary shovel of the pet excrement collection device provided by the present invention in one of its states;

[0031] Figure 3 is a simplified structural schematic diagram of the rotary shovel of the pet excrement collection device provided by the present invention in another state;

[0032] Figure 4 This is a simplified module connection diagram of the functional modules of the pet excrement collection device provided by the present invention;

[0033] Figure 5 Schematic diagram of information interaction between functional modules of the pet excrement collection device provided by the present invention;

[0034] Figure 6 It is a flow chart of the odor control method of the pet excrement collection device provided by the present invention.

[0035] Reference Signs List

[0036] 100: Collection basin body; 200: Olfactory detection unit; 210: Gas sensor; 300: Trigger unit; 310: Main control board; 320: Threshold memory; 330: Clock module; 400: Execution unit; 401: Sand bin; 402: Sand bin opening; 403: Adsorbed material; 404: Collection bin; 405: Air flow channel; 410: Exhaust unit; 411: Air outlet; 412: Exhaust outlet; 413: Centrifugal fan; 420: Flip masking unit; 421: Rotating shovel; 422: Vibrating component; 423: Sliding rod; 500: Alarm unit; 510: Sound and light alarm; 520: Wireless communication module. DETAILED DESCRIPTION

[0037] The following is a detailed description with reference to the accompanying drawings.

[0038] This article explains some of the noun terms.

[0039] Concentration gradient: refers to the concentration difference and changing trend of volatile organic compounds (VOCs) and characteristic malodorous substances (such as ammonia and hydrogen sulfide) in the collection basin body 100 in terms of spatial distribution.

[0040] Specifically, by deploying gas sensors 210 at at least three different locations in the collection basin body 100, the concentration data of the target substance at each point is collected in real time, and the ratio of the concentration difference between adjacent gas sensors 210 to their distance is calculated (unit: mg / (m 3 ·cm)) to determine the gradient direction and intensity of the concentration increase (the ratio of the absolute value of the maximum concentration difference to the distance); at the same time, the time dimension is combined to analyze the rate of change of concentration per unit time (mg / (m 3 ·s)). Concentration gradients are used to track the dynamics of odor diffusion.

[0041] Collection basin body 100: refers to the core physical structure of the pet excrement collection device, including an integrated body of a sealed outer shell, an internal sand bin 401, an excrement processing area and a sealing component.

[0042] Preferably, the collection basin body 100 is a closed container made of corrosion-resistant, low-adsorbability material (such as ABS plastic), including a top sand bin opening 402 (for pets to enter and exit), a sand bin 401 (a chamber for containing adsorbent material 403) and a bottom excrement collection bin 404; built-in guide baffles, negative pressure air ducts and other air flow channels 405 are used to guide the gas to flow in a directional manner to the filter module.

[0043] The sand bin 401 is the core functional area of the collection basin body 100, used to carry the adsorption material 403 and receive pet excrement. Its geometric design (such as depth and inclination) affects the odor collection characteristics.

[0044] Sealing components: including magnetic locks on the door and silicone sealing rings, ensure that gas circulates only in the preset path to prevent odor leakage from interfering with detection.

[0045] Exhaust mode: an execution mode for guiding the pollutant gases (VOCs and malodorous substances) in the collection basin body 100 to the filtration system through the direction of negative pressure airflow, while suppressing the spread of odor.

[0046] Flip masking mode: The adsorption material 403 in the high concentration gradient area (odor source) is flipped and covered by the rotating shovel 421 or the vibrating component 422 to block the release of odor.

[0047] Example 1

[0048] The present invention relates to a pet excrement collection device suitable for the excrement management needs of a variety of household pets. The pet excrement collection device is not only suitable for cat litter boxes used by cats, but can also be used to collect excrement from dogs, rodents (such as hamsters and guinea pigs), and reptiles (such as lizards and turtles).

[0049] The pet of the present invention is one or more of a cat, dog, hamster, guinea pig, rabbit, lizard or turtle. The pet excrement collection device includes but is not limited to the following forms:

[0050] closed or open litter boxes for cats;

[0051] Indoor urine collectors or toilet training devices for dogs;

[0052] Cage structures with collection troughs at the bottom for rodents;

[0053] Replaceable litter boxes or isolated litter boxes for reptiles;

[0054] Automatic cleaning pet waste collection device;

[0055] Intelligent waste collection system with deodorization, sterilization or automatic filling replacement functions.

[0056] The present invention provides a pet excrement collection device and an odor control method thereof. The present invention may also provide an odor control system for the pet excrement collection device. The present invention may also provide an alarm system and method for the pet excrement collection device.

[0057] like Figure 6 As shown, the odor control method of the pet excrement collection device includes:

[0058] S1: Real-time detection of the concentration gradient of volatile organic compounds and characteristic malodorous substances in the collection basin body 100;

[0059] S2: comparing the received concentration gradient with a preset concentration threshold, identifying an execution mode based on the comparison result, and executing an exhaust mode and / or a flip masking mode;

[0060] S3: When the timing after the execution mode ends reaches the verification time, the concentration gradient updated at the verification time is compared with the preset concentration threshold again; when the updated concentration gradient is higher than the preset concentration threshold, an alarm message is issued.

[0061] Through dual-stage concentration verification and multi-mode coordinated control, the odor control method establishes a closed-loop odor control mechanism, improving odor elimination efficiency and operational reliability while reducing user maintenance requirements. This technical solution effectively improves pet waste management efficiency, reduces odor spread, and enhances cleaning convenience, making it suitable for a variety of pet use scenarios.

[0062] like Figures 1 to 5 As shown, the present invention provides a pet excrement collection device, comprising an olfactory detection unit 200, a trigger unit 300, an execution unit 400, and an alarm unit 500. The pet excrement collection device executes the odor control method of the present invention.

[0063] The olfactory detection unit 200 is used to detect the concentration gradient of volatile organic compounds and characteristic malodorous substances in the collection basin body 100 in real time.

[0064] like Figure 4 As shown, the olfactory detection unit 200 includes a gas sensor array or gas sensors 210 positioned at different locations within the collection basin body 100. The gas sensors 210 include a sensing component that collects the concentration gradient of volatile organic compounds and characteristic malodorous substances within the collection basin body 100, and a computing chip. The computing chip, which can be a dedicated ASIC chip, calculates the concentration gradient vector (intensity and direction) of the gas sensors 210 in real time.

[0065] Preferably, the gas sensor 210 can be installed at the top of the sand bin 401 as the primary sensor, with its collection range covering the ascending path of excrement volatile gases. Gas sensors 210 can also be installed on the sidewalls of the sand bin 401, for example, with two auxiliary gas sensors 210 installed symmetrically. Preferably, the auxiliary gas sensor 210 is 5 cm from the sand layer surface to detect the horizontal diffusion gradient. Gas sensors 210 are also installed in the bottom collection bin 404. For example, redundant gas sensors 210 can be embedded to monitor local concentrations in the excrement accumulation area.

[0066] The gas sensor 210 is connected to the 2 The C bus is connected to the main control board 310 of the trigger unit 300. Preferably, the sampling frequency of the gas sensor 210 is ≥10 Hz.

[0067] like Figure 4 and Figure 5 As shown, the trigger unit 300 receives the concentration gradient, compares the concentration gradient with a preset concentration threshold, identifies the execution mode based on the comparison result, and sends a trigger instruction to the execution unit 400.

[0068] Preferably, the trigger unit 300 is integrated into an independent sealed cavity of the collection basin body 100 and is physically isolated from the sand bin 401 to avoid gas corrosion.

[0069] Preferably, if Figure 4 As shown, the trigger unit 300 includes a main control board 310, a threshold memory 320, and a clock module 330. The main control board 310 and the olfactory detection unit 200 are directly connected via a shielded cable to reduce signal interference.

[0070] The main control board 310 is, for example, a microcontroller with a built-in pattern recognition algorithm. The threshold memory 320 is, for example, an EEPROM chip, used to store the preset concentration threshold. The clock module 330 is, for example, a high-precision RTC, used to time the verification time, such as Figure 5 Preferably, the verification time is 5 to 20 minutes. Further preferably, the verification time is 5 to 10 minutes.

[0071] Preferably, after receiving the concentration gradient from the olfactory detection unit 200, the trigger unit 300 triggers the mode comparison logic via the GPIO interrupt. The trigger unit 300 uses the CAN bus protocol to send the exhaust trigger instruction and / or the flip trigger instruction to the execution unit 400. Figure 5 As shown, the trigger unit 300 outputs an alarm trigger instruction to the alarm unit 500 through an optocoupler isolation circuit.

[0072] like Figure 6 As shown, the execution unit 400 executes the exhaust mode and / or the flip masking mode in response to the exhaust trigger instruction and / or the flip trigger instruction corresponding to the execution mode sent by the trigger unit 300. The alarm unit 500 issues an alarm message in response to the received trigger instruction.

[0073] Preferably, the execution unit 400 includes an exhaust unit 410 and a flip masking unit 420. The execution modes include an exhaust mode and a flip masking mode.

[0074] Exhaust unit 410 includes a centrifugal fan 413 and a guide baffle driven by a stepper motor. The centrifugal fan 413 and the guide baffle are embedded in the filter module's air duct. Preferably, the airflow path is parallel to the bottom of the sand bin 401. Centrifugal fan 413 is controlled by a MOSFET driver circuit, which receives a PWM speed control signal from the main control board 310.

[0075] like Figure 2 and Figure 3As shown, the flip masking unit 420 includes a rotating shovel 421 and a vibrating component 422. The rotating shovel 421 and the vibrating component 422 are respectively controlled by a MOSFET drive circuit, and receive the PWM speed regulation signal of the main control board 310. Preferably, the rotation control member of the rotating shovel 421 is rotatably connected to the sliding rod 423. The sliding rod 423 is arranged at the bottom of the rotating shovel 421 and is spaced apart from the rotating shovel 421. The sliding rod 423 is horizontally fixed in the collection basin body 100. The rotating control member is relatively fixed to the rotating shovel 421. When the sliding rod 423 moves horizontally, it drives the rotating control member to rotate, so that the rotating shovel 421 and the rotating control member rotate synchronously. As shown Figure 2 and Figure 3 As shown, in the horizontal direction, the horizontal movement amplitude and movement direction of the sliding rod 423 are controlled by the MOSFET driving circuit. When the sliding rod 423 moves in different directions in the horizontal direction, the rotary shovel 421 will rotate in corresponding different directions.

[0076] Preferably, if Figure 2 and Figure 3 As shown, the vibration component 422 is mounted on the side wall of the sand bin 401. Preferably, the vibration component 422 is mounted on the outer surface of the side wall of the sand bin 401. The vibration component 422 includes a driving unit, a vibration conducting structure, a fixing base and a control module.

[0077] The drive unit is a motor-driven vibration generator consisting of a rotating shaft and an eccentric mass, converting electrical energy into mechanical vibration. The vibration transmission structure, a composite structure consisting of a rigid metal plate and an elastic buffer layer, efficiently transmits vibration energy to the side walls of sand bin 401. The fixed base features a mounting bracket with a non-loosening design, ensuring a rigid connection between the component and the outer wall of sand bin 401. The control module integrates sensors and regulation circuitry to monitor the sand layer's condition and automatically adjust vibration parameters.

[0078] The drive unit is preferably coaxially assembled with the eccentric mass to ensure rotational balance. A vibration-conducting structure is connected to the output of the drive unit, with an elastic buffer layer to reduce high-frequency noise. The entire assembly is secured to a base and rigidly connected to the outer wall of sand bin 401 via bolts. An integrated control module circuit enables vibration start / stop and parameter feedback adjustment.

[0079] Preferably, the vibrating member 422 is fixed to the outer surface of the side wall of the sand bin 401 through a floating mounting bracket. The installation position must meet the following requirements: it is located slightly below the geometric center of the effective sand loading area of the sand bin 401, and the inclination angle of the bracket is automatically adjusted as the height of the sand layer changes; a vibration isolation gasket is arranged between the vibrating member 422 and the bin body support structure to suppress the transmission of vibration energy through the frame.

[0080] Preferably, thin-film piezoresistive sensors are embedded in a distributed manner on the inner surface of the bottom of the sand bin 401. The control module uses thin-film piezoresistive sensors to capture the pressure gradient changes in sand layers at different depths in real time, which is used to calculate the density distribution of sand particles and the depth of foreign matter burial. The control module continuously collects the propagation attenuation characteristics of vibration waves in the X / Y / Z axes through a three-axis accelerometer installed on the vibration conduction structure, and provides feedback on the vibration energy transfer efficiency. The infrared position recognition module (not shown) is installed on the inner wall of the sand bin 401 at a height higher than the surface of the adsorbent material 403, with the illumination angle facing the adsorbent material 403. The control module uses a pyroelectric infrared sensor array as an infrared position recognition module. By detecting abnormal temperature areas on the sand layer surface, the plane coordinates and coverage area of the excrement are accurately located. The control module receives height data from a sand surface height sensor (not shown) based on the laser ranging principle, and tracks the surface settlement of the sand layer in real time during the vibration process, establishing a corresponding relationship between the sand flow rate and vibration parameters.

[0081] Preferably, a pyroelectric infrared sensor array is embedded in the inner edge of the top cover of sand bin 401, arranged in a circular array. The detection surface of the pyroelectric infrared sensor array is inclined at a 15-30° angle to the sand surface. This inclination prevents sand splashes from directly contaminating the pyroelectric infrared sensor window. The circular layout achieves a 240° effective detection field of view, covering the center to the edge of sand bin 401. A sand surface height sensor is fixed to the upper sidewall of sand bin 401, with the laser emitting end pointing perpendicularly toward the sand surface through a dust-proof window. The laser ranging optical path of the sand surface height sensor coincides with the central axis of the sand bin, ensuring that the measurement reference point is located at the geometric center. The sand surface height sensor is installed on the sidewall at a height of 4 / 5 of the total height of sand bin 401, avoiding the main vibration wave transmission path (the resonance node region in the middle of the sidewall). The pyroelectric infrared sensor array and the sand surface height sensor's mounting axis are orthogonal to eliminate measurement blind spots. Preferably, all sensor wires are connected to the control module through an electromagnetically shielded channel embedded in the outer wall of sand bin 401.

[0082] The vibration mechanism of vibrating component 422 is as follows: a motor in the drive unit rotates an eccentric mass, converting electrical energy into controllable mechanical vibration. The vibration transmission structure utilizes a composite design of rigid and elastic materials: a rigid metal layer efficiently transmits low-frequency vibrations to the sidewalls of sand bin 401, while an elastic buffer layer suppresses high-frequency harmonics, preventing dust emission and structural resonance. A floating mounting bracket dynamically adjusts the direction of vibration wave propagation based on the height of the sand layer, ensuring that energy is concentrated at the center of gravity of the sand accumulation.

[0083] After vibration energy is transmitted into sand bin 401, the forced vibration causes the sand particles to break through static equilibrium and enter a transient fluidized state. Driven by the propagation direction of the vibration wave and the Coriolis effect, the surface sand particles form a centripetal flow trend. The bottom sand particles migrate upward due to the negative pressure gradient created by vibration densification. The two sand flows converge at the excrement location, achieving three-dimensional coverage through shear force and drag. The control module uses pyroelectric infrared sensors to identify areas of abnormal sand surface temperature. Combining data from laser ranging and piezoresistive sensors, it analyzes sand density, foreign object location, and flow conditions in real time, dynamically adjusting the vibration frequency, amplitude, and phase difference to optimize the sand flow path and burial efficiency. The sensor layout and vibration transmission path are orthogonal to avoid measurement blind spots and energy loss, ensuring uniform and complete burial. Through the synergistic effect of directional energy transfer, sand motion induction, and real-time feedback regulation, the control module achieves rapid and stable coverage of excrement while minimizing structural damage and energy waste.

[0084] After the execution unit 400 is finished, the clock module 330 starts timing. When the timing after the execution unit 400 is finished reaches the verification time, the trigger unit 300 compares the concentration gradient updated at the verification time with the preset concentration threshold again, and sends a trigger instruction to the alarm unit 500 if the updated concentration gradient is higher than the preset concentration threshold, such as Figure 4 and Figure 5 shown.

[0085] Preferably, the alarm unit 500 includes an audible and visual alarm 510 and a wireless communication module 520. The audible and visual alarm 510 is directly controlled by the trigger unit 300 through the GPIO port. The wireless communication module 520 interacts with the main control board 310 through the UART serial port and supports the MQTT protocol to upload alarm logs.

[0086] The sound and light alarm 510 may be, for example, a surface-mount LED and a piezoelectric buzzer. The LED can emit light of a specified color. The color of the light can be freely set and is not limited here. The LED and buzzer can be mounted on the outer panel (visual / audio warning area) of the collection basin body 100.

[0087] The wireless communication module 520 is, for example, a Wi-Fi / BLE dual-mode chip, which is used to push alarm information to the user terminal. The wireless communication module 520 is placed on the top of the sand bin 401 to prevent the metal shield from affecting the signal.

[0088] According to a preferred embodiment, the trigger unit 300 calculates the location coordinates of the odor source in the adsorbent material 403 based on the concentration gradient difference transmitted by the gas sensor 210. Based on the location coordinates of the odor source, the trigger unit 300 calculates an exhaust path formed by the air outlet angle of the blowing port 411 and the air extraction angle of the exhaust port 412, so that the exhaust path covers the area where the location coordinates of the odor source are located.

[0089] Through gradient field modeling and weighted centroid algorithm of high-density sensor grid, the present invention achieves millimeter-level positioning accuracy of the three-dimensional coordinates of the odor source, solving the technical bottleneck that traditional single sensors cannot distinguish the direction of odor diffusion, improving the matching degree between the spatial coverage of the exhaust path and the location of the pollution source, and significantly reducing the odor escape rate.

[0090] According to a preferred embodiment, the trigger unit 300 calculates the wind force of the exhaust mode based on the modulus of the concentration gradient, which is the amplitude of the concentration gradient vector detected at the location coordinates of the odor source.

[0091] Based on the modulus length quantification of the concentration gradient vector to characterize the odor intensity, the present invention establishes a nonlinear mapping relationship between wind force and pollution degree, so that the system maintains silent operation at low concentrations and automatically switches to the maximum wind speed during odor outbreaks. Compared with the fixed power mode, it saves energy and shortens the odor removal time.

[0092] Specifically, the calculation process of the trigger unit 300 of the present invention is as follows.

[0093] Set the 3D gradient vector to:

[0094]

[0095] The mode length of the concentration gradient is:

[0096]

[0097] in, represents the three-dimensional concentration gradient vector measured by the gas sensor array. represents the rate of change of concentration in the x direction; represents the concentration change rate in the y direction; Indicates the concentration change rate in the z direction. It represents the modulus of the concentration gradient and characterizes the odor intensity.

[0098] The calculation process of the trigger unit 300 to calculate the pollution source coordinates is:

[0099] Set the weighted centroid to:

[0100]

[0101] The weight coefficient is:

[0102] Among them, r 质心 represents the coordinates of the pollution source, S i represents the coordinates of the i-th gas sensor 210; σ i represents the noise measured by the gas sensor 210; ⊙ represents the Hadamard product, which is used for element-by-element multiplication.

[0103] After obtaining the concentration intensity of each gas sensor 210, the trigger unit 300 normalizes the concentration intensity to obtain a normalized concentration intensity:

[0104]

[0105] The rotation speed of the centrifugal fan 413 is controlled according to different normalized concentration intensities.

[0106]

[0107] Wherein, ω represents the rotation speed of the centrifugal fan 413, which ranges from 800 to 2800 RPM; sigmoid(x) represents the S-type function; 2.5, 12, and 0.8 outside the brackets represent curve parameters, respectively.

[0108] The nonlinear wind speed control strategy of the trigger unit 300 of the present invention is designed based on the dynamic response characteristics of the concentration gradient intensity, and realizes multi-condition adaptive adjustment through a piecewise function structure. The working mechanism of the trigger unit 300 can be divided into three main stages:

[0109] Low concentration area control The fan speed is regulated using an exponential function, whose mathematical form matches the spatial attenuation characteristics of the gas diffusion equation. The initial high growth rate in this range is intended to establish a basic airflow field to suppress pollution diffusion, while the nonlinear growth rate characteristic maintains the speed in a low-noise range.

[0110] Transition zone control A modified sigmoid function achieves smooth transitions, its continuous differentiability avoiding the speed steps of traditional segmented control. By adjusting the function's curvature, the wind speed is rapidly increased when the concentration intensity reaches an intermediate threshold, while the inertia time constant is used to suppress speed fluctuations. This setup ensures that gradient intensity measurement noise does not cause frequent starts and stops of the wind turbine, significantly improving mechanical stability.

[0111] Saturation region control A linear speed-up mode with a correction term is used to prevent speed overshoot while maintaining maximum cleaning efficiency. The terminal speed reduction design compensates for sensor measurement delays, and a safe speed limit is calculated in conjunction with an airflow dynamics model.

[0112] The control intervals of the trigger unit 300 undergo rigorous Lyapunov stability verification to ensure state continuity and energy boundedness across the full operating range. Control parameters are optimized through combined gas-solid two-phase flow simulation and energy consumption modeling, balancing sand suspension control and electrical energy conversion efficiency.

[0113] In the prior art, the calculation of gas concentration in pet excrement collection devices such as cat litter boxes generally ignores the calculation of temperature and humidity supplements. However, in fact, due to the influence of the material and physical space structure of the cat litter box, the data accuracy of the concentration gradient of the gas sensor 210 is significantly affected by temperature and humidity, which causes the existing cat litter box to have insufficient air wind or poor odor elimination effect. For example, cat litter boxes are mostly made of polymer plastic materials (such as PP / ABS), and the amount of ammonia molecules adsorbed by their surface pores increases exponentially with humidity (BET adsorption model). When the humidity is >70% RH, the amount of ammonia adsorbed on the plastic surface can reach 3-5 times that in a dry environment, resulting in a falsely low detection value of the gas sensor 210, and the gas phase ammonia concentration is weakened by material adsorption. The actual concentration of 50ppm may only be measured as 30ppm. When the humidity drops, the adsorbed ammonia is released a second time, causing a concentration pulse spike.

[0114] Generally speaking, the volume of a pet excrement collection device, such as a cat litter box, is about 0.15m 3 , the top opening rate is <5%, forming a quasi-static airflow environment. The temperature difference between the bottom of the cat litter box (in contact with excrement) and the top can reach 8-12°C, triggering natural convection vortices. If temperature and humidity compensation calculations are not performed, the actual diffusion rate in the high-temperature zone (35°C) is fast, but the gas sensor 210 reading is low, and the reading in the low-temperature zone (25°C) is artificially high, resulting in the failure of local concentration monitoring. This causes the centrifugal fan 413 to mistakenly start the high-speed mode in the low-temperature zone, while the high-temperature pollution core area is not effectively cleared.

[0115] The equilibrium moisture content of bentonite / silica gel adsorption materials is approximately 12-18%. The addition of feces instantly raises the local moisture content to over 60%. Humidity within 3 cm of feces reaches 95% RH, which inhibits the response of semiconductor gas sensors (reducing sensitivity). Without temperature and humidity compensation, a true ammonia concentration of 50 ppm in a high-humidity area may only be measured at 28 ppm, resulting in a 10-15 minute delay in deodorization.

[0116] When the ambient temperature drops suddenly (e.g., when the air conditioner is turned on), condensation easily forms on the surface of the metal oxide sensor. When the dew point temperature difference exceeds 5°C, a micron-sized water film forms on the surface of gas sensor 210, hindering gas diffusion (Fick's law fails). This causes the output value of gas sensor 210 to be locked at the baseline noise level, completely losing its concentration sensing ability. This is one of the reasons why the sensitivity of existing pet excrement collection devices decreases significantly after a period of use, leading to product disapproval from users.

[0117] According to a preferred embodiment, Figure 5 As shown, the trigger unit 300 calculates temperature and humidity compensation for the received concentration gradient before comparison, and compares the concentration gradient after temperature and humidity compensation with a preset concentration threshold to improve comparison accuracy.

[0118] Specifically, the calculation formula for temperature compensation is:

[0119]

[0120] Among them, C raw represents the original detection concentration gradient of the gas sensor 210 (ppm / cm); T represents the real-time temperature measurement value (°C); H represents the real-time humidity measurement value (%RH); T0 = 25°C represents the standard calibration temperature; H0 = 50%RH represents the standard calibration humidity; α = 0.03°C -1 Indicates the temperature compensation coefficient; β=0.015RH -1 Indicates the humidity compensation coefficient.

[0121] For example, at T = 40°C, the correction amount reaches 0.03 × (40 - 25) = 0.45, corresponding to a 45% increase in molecular diffusion rate. At H = 90% RH, the compensation amount reaches 0.015 × (90 - 50) = 0.6, eliminating signal attenuation caused by water film adsorption. At T = 38°C and H = 95% RH, the compensation factor is 1 + 0.45 + 0.675 = 2.125, effectively suppressing sensor sensitivity loss.

[0122] A temperature and humidity compensation algorithm (temperature compensation coefficient α = 0.03 / °C, humidity compensation β = 0.015RH) is used to reduce the detection error of the gas sensor 210, effectively eliminate false positive signals in tropical high-humidity environments, and reduce the misjudgment rate of concentration threshold comparison.

[0123] After performing temperature compensation calculations, the trigger unit 300 of the present invention corrects for gas-phase concentration detection deviations caused by surface adsorption, avoiding distorted readings due to shifts in the adsorption-desorption equilibrium. It also dynamically adjusts the response characteristics of the gas sensor 210 to accurately reflect the true volatility intensity in the local high-temperature region surrounding the excrement. This correction overcomes the sensitivity degradation problem of traditional gas sensors in temperature gradient fields. Using temperature and humidity compensation technology, the trigger unit 300 can more accurately reconstruct the three-dimensional concentration distribution within the collection basin body 100. By correcting for local differences in temperature and humidity at each detection point, the trigger unit 300 can accurately identify the direction of the maximum concentration gradient and pinpoint the spatial location of the pollution source, providing a sound foundation for the accurate implementation of the subsequent flip masking and vibration modes.

[0124] According to a preferred embodiment, the triggering condition of the flip masking mode includes: when the concentration of the characteristic malodorous substance in the concentration gradient exceeds a preset concentration threshold, the flip masking mode is preferentially triggered.

[0125] Preferably, the concentration threshold of NH3 is C th =25±5ppm.

[0126] Cat urine releases NH3 at concentrations of 20-40 ppm in the initial decomposition phase (within 1 hour). The interfering gas in pet food, such as cat food, is C3H6O, which is acetone volatilized from the pet food.

[0127] When the acetone concentration is greater than 50ppm, the NH3 signal may be masked (GC-MS cross-sensitivity analysis). To avoid false triggering of pet food volatiles (such as acetone C3H6O), set the selective suppression conditions:

[0128]

[0129] This triggering condition setting covers over 80% of the initial NH3 concentration released by excretion and eliminates false triggering due to non-target gases (such as acetone). Clearly, the present invention prioritizes responding to key odor components produced by biological excretion in a mixed gas environment, improving the triggering accuracy of the flip masking mode and avoiding ineffective cleaning actions caused by non-target gases (such as pet food volatiles).

[0130] According to a preferred embodiment, after exhausting the air, when the position coordinates of the odor source remain unchanged for a set period of time, the trigger unit 300 determines the mode of alternating action of the rotating shovel 421 and the vibration component 422, wherein, after the rotating shovel 421 performs the sand burying in a fan-shaped trajectory, the vibration component 422 compacts the sand burying area by vibrating the adsorbed material 403, as shown in FIG. Figure 5 shown.

[0131] Preferably, the duration is 90-120 seconds. Preferably, the duration is 105 seconds.

[0132] After the exhaust stops, the NH3 volatilization rate of deep excreta is affected by the porosity (ε=0.38) and humidity (RH>70%) of the adsorption material, which conforms to the modified Fick's law:

[0133]

[0134] D eff represents the effective diffusion coefficient of the adsorbed material, which is 2.1×10 -6 m 2 / s. The exponential term in the formula represents the attenuation of airflow disturbance after exhaust.

[0135] Within 90 seconds after exhaust, the surface NH3 concentration of the adsorption material dropped from 80 ppm to 25 ppm. Therefore, the duration of 105 seconds can cover the critical time window (45-90 seconds) for gas redispersion after exhaust, ensuring that deep-seated pollution is effectively treated.

[0136] like Figure 5 As shown, the present invention employs a strategy of alternating mechanical motion (rotating shovel 421 at an inclination angle of 55°±2° and a vibration frequency of 8Hz) to achieve a gradient treatment for stubborn odors. For example, deep-seated pollution sources are exposed by burying the sand in a fan-shaped trajectory, and then surface adsorption material 403 is compacted with vibration at an acceleration of 2.5G, reducing the residual odor from an initial 300ppm to 80ppm→35ppm in a step-by-step manner while maintaining the surface flatness of the sand basin.

[0137] According to a preferred embodiment, when the updated concentration gradient is compared with the preset concentration threshold again, the trigger unit 300 uses a sliding window algorithm to perform trend analysis on the updated concentration gradient, and directly sends a trigger instruction to the alarm unit 500 when the trend continues to rise.

[0138] Preferably, the time window length N is set to 5s.

[0139] The current moment is, and the concentration gradient sequence within the constructed window is:

[0140]

[0141] C t Δt represents the gas concentration at a given moment (unit: ppm). Δt is preferably 10 s, which is the sampling interval of the gas sensor 210.

[0142] The calculation formula for trend analysis of concentration gradient is:

[0143]

[0144] The weight is: w i =e λ(i-1) , λ=0.18 (time attenuation coefficient).

[0145] After weight normalization:

[0146] G t,i Indicates that at time t i The concentration gradient value at ω i Represents weight, which is used to adjust the importance of data at different time points; t i represents the i-th time point; Represents the weighted average time, that is, all time points t i According to the weight ω i Calculated mean value; represents the weighted average concentration gradient, that is, all concentration gradients G t,i According to the weight ω i Calculate the average value.

[0147] The triggering conditions of the alarm unit 500 are set as:

[0148]

[0149] Among them, β t represents the trend index; β th represents the trend significance threshold, which is 0.85; It is an indicative function (positive gradient counts). When the positive growth rate of the concentration gradient is ≥80%, it is judged to be a continuous increase.

[0150] The time to reach the threshold is predicted based on the trend coefficient:

[0151]

[0152] Preferably, C th Indicates the preset concentration threshold; t delay Indicates the response delay time.

[0153] For example, the concentration gradient sequence G of the window t =[0.7,0.9,1.1,1.3,1.5]ppm / s.

[0154] Then, the weighted trend coefficient is calculated as:

[0155] w=[e 0.18×4 ,e 0.18×3 ,...,e 0 ]=[2.05,1.72,1.43,1.20,1.00];

[0156]

[0157] β t =0.92 is greater than 0.85; the positive gradient ratio = 5 / 5 = 100% is greater than 80%.

[0158] That is, the trend is rising, and at this time the trigger unit 300 directly sends a trigger instruction to the alarm unit 500.

[0159] The present invention introduces sliding window trend analysis, which can predict concentration explosion trends in advance and initiate preventive ventilation before reaching a preset threshold. This invention reduces the missed alarm rate of emergency alarms to near zero.

[0160] According to a preferred embodiment, when trigger unit 300 generates a trigger instruction after first comparing the concentration gradient with a preset concentration threshold, it simultaneously starts a delay timer. If the concentration gradient falls below the preset concentration threshold during the delay period, the trigger instruction is canceled to avoid false triggering caused by transient changes in the concentration gradient. Preferably, the delay period is 60 ± 15 seconds, and more preferably 60 seconds.

[0161] Through the delayed instruction arbitration mechanism, the trigger unit 300 of the present invention effectively filters the instantaneous pulse signal caused by the brief splashing of the adsorbed material 403 or the external air disturbance, thereby reducing the number of false triggers of the system, while ensuring a 100% capture rate of real pollution events, and significantly extending the life of the actuator.

[0162] It should be noted that the above-mentioned specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also fall within the scope of the disclosure of the present invention and fall within the scope of protection of the present invention. Those skilled in the art should understand that the present invention specification and its drawings are illustrative and do not constitute a limitation on the claims. The scope of protection of the present invention is defined by the claims and their equivalents. The present invention specification contains multiple inventive concepts, such as "preferably" and "according to a preferred embodiment", which means that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to file a divisional application based on each inventive concept.

Claims

1. A pet excrement collection device, characterized in that: include: An olfactory detection unit (200) is used to detect the concentration gradient of volatile organic compounds and characteristic malodorous substances in the collection basin body (100) in real time; a trigger unit (300) that compares the received concentration gradient with a preset concentration threshold, identifies an execution mode based on the comparison result, and sends a trigger instruction to an execution unit (400); when the timing after the execution of the execution unit (400) reaches the verification time, compares the concentration gradient updated at the verification time with the preset concentration threshold again, and sends a trigger instruction to an alarm unit (500) when the updated concentration gradient is higher than the preset concentration threshold; The execution unit (400) executes the exhaust mode and / or the flip masking mode in response to the trigger instruction corresponding to the execution mode sent by the trigger unit (300), The alarm unit (500) issues an alarm message in response to the received trigger instruction.

2. The pet excrement collection device according to claim 1, characterized in that: The olfactory detection unit (200) includes gas sensors (210) arranged at different directions of the collection basin body (100). The gas sensor (210) collects the concentration gradient of volatile organic compounds and characteristic malodorous substances in the collection basin body (100), and sends the concentration gradient to the trigger unit (300) in a time-dependent manner.

3. The pet excrement collection device according to claim 1 or 2, characterized in that: The trigger unit (300) calculates the position coordinates of the odor source in the adsorption material (403) based on the concentration gradient difference sent by the gas sensor (210). Based on the position coordinates of the odor source, an exhaust path formed by the air outlet angle of the blowing port (411) and the air suction angle of the exhaust port (412) is calculated so that the range of the exhaust path covers the area where the position coordinates of the odor source are located.

4. The pet excrement collection device according to any one of claims 1 to 3, characterized in that: The trigger unit (300) calculates the wind force of the exhaust mode based on the mode length of the concentration gradient, The modulus is the amplitude of the concentration gradient vector detected at the position coordinates of the odor source.

5. The pet excrement collection device according to any one of claims 1 to 4, characterized in that: The trigger unit (300) performs temperature and humidity compensation calculation on the received concentration gradient before comparison, and compares the compensated concentration gradient value with a preset concentration threshold value to improve comparison accuracy.

6. The pet excrement collection device according to any one of claims 1 to 5, characterized in that: The triggering condition of the flip masking mode includes: when the concentration of the characteristic malodorous substance in the concentration gradient exceeds a preset concentration threshold, the flip masking mode is preferentially triggered.

7. The pet excrement collection device according to any one of claims 1 to 6, characterized in that: The flip masking unit (420) for executing the flip masking mode includes a rotating shovel (421) and a vibration member (422). When the position coordinates of the odor source remain unchanged for a set period of time, the trigger unit (300) determines a mode in which the rotating shovel (421) and the vibrating member (422) alternately act, wherein: After the rotary shovel (421) performs sand filling in a fan-shaped trajectory, the vibrating component (422) compacts the sand filling area by vibrating and absorbing the material (403).

8. The pet excrement collection device according to any one of claims 1 to 7, characterized in that: In the process of comparing the updated concentration gradient with the preset concentration threshold again, the trigger unit (300) uses a sliding window algorithm to perform trend analysis on the updated concentration gradient, and directly sends a trigger instruction to the alarm unit (500) when the trend shows a continuous increase.

9. The pet excrement collection device according to any one of claims 1 to 8, characterized in that: When the trigger unit (300) generates a trigger instruction after comparing the concentration gradient with a preset concentration threshold for the first time, it starts a delay timer synchronously, and cancels the trigger instruction if the concentration gradient falls below the preset concentration threshold during the delay period, so as to avoid false triggering caused by instantaneous changes in the concentration gradient.

10. A method for controlling the odor of a pet excrement collection device, characterized in that: The method comprises: Real-time detection of the concentration gradient of volatile organic compounds and characteristic malodorous substances in the collection basin body (100); comparing the received concentration gradient with a preset concentration threshold, identifying an execution mode based on a comparison result, and executing an exhaust mode and / or a flip masking mode; When the timing after the execution mode ends reaches the verification time, the concentration gradient updated at the verification time is compared with the preset concentration threshold again, and when the updated concentration gradient is higher than the preset concentration threshold, an alarm message is issued.

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