CN-122016032-A - Method, device, equipment and storage medium for detecting skillet based on vibration spectrum

CN122016032ACN 122016032 ACN122016032 ACN 122016032ACN-122016032-A

Abstract

The embodiment of the application provides a method, a device, equipment and a storage medium for detecting a skillet based on a vibration spectrum, and belongs to the technical field of intelligent household appliances. The method comprises the steps of obtaining vibration signals on the surface of a kitchen range, carrying out frequency spectrum analysis on the vibration signals, extracting vibration amplitude information in a characteristic frequency band related to the sliding behavior of a cooker, determining corresponding vibration amplitude statistics based on the vibration amplitude information, and determining whether a cooker sliding event occurs according to the vibration amplitude statistics. By the mode, the detection window is locked on the narrow-band energy determined by the physical mechanism of the pot, and wide-spectrum interference such as fans, stir-frying, electromagnetic noise and the like is naturally shielded. The false alarm and missing alarm of the skillet are reduced, so that the cooker can still identify the skillet with high confidence and in real time under the complex kitchen environment.

Inventors

YANG XIAOLING
SONG YANJIN
WEI JIANXIN
SHEN LINGMIN
Xu Zhiteng
DONG YANLI

Assignees

青岛海尔智慧厨房电器有限公司
海尔智家股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260123

Claims (10)

1. A method for detecting a pan with a vibration spectrum, the method comprising: Acquiring a vibration signal of the surface of the kitchen range; Performing spectrum analysis on the vibration signal, and extracting vibration amplitude information in a characteristic frequency band related to the pan sliding behavior; and determining corresponding vibration amplitude statistics based on the vibration amplitude information, and determining whether a skiing event occurs according to the vibration amplitude statistics.
2. The method of claim 1, wherein said determining whether a pan event has occurred based on said vibration amplitude statistic comprises: collecting cooking parameters of the kitchen range, and determining the current cooking stage of the kitchen range according to the change condition of the cooking parameters; inquiring a preset skillet judgment threshold relation based on the cooking stage and the data type of the vibration amplitude statistic to obtain a corresponding skillet judgment threshold; acquiring the magnitude relation between the vibration amplitude statistic and the pot-sliding judging threshold; And when the vibration amplitude statistic is greater than or equal to the skillet judgment threshold value, determining that the cooker has a skillet event.
3. The method of claim 2, wherein prior to the obtaining the magnitude relationship of the vibration amplitude statistic and the pan determination threshold, the method further comprises: Collecting an environmental vibration signal of current environmental noise in a sliding window mode; Performing spectrum analysis on the environmental vibration signal to obtain a corresponding spectrum energy baseline; Multiplying the spectrum energy baseline by a preset proportionality coefficient to obtain a candidate threshold value which changes in real time along with environmental noise; determining whether the candidate threshold is less than the pot slide decision threshold; if yes, updating the skillet judging threshold value based on the candidate threshold value.
4. The method of claim 1, wherein the performing a spectral analysis on the vibration signal to extract vibration amplitude information in a characteristic frequency band related to a pan sliding behavior comprises: Performing fast fourier transform on the vibration signal to obtain an amplitude spectrum; defining a characteristic frequency band in the amplitude spectrum based on a preset pan sliding resonance interval; And determining vibration amplitude information based on the amplitude value corresponding to the frequency point in the characteristic frequency band.
5. The method of claim 1, wherein if it is determined that a pan slipping event is occurring with the cooktop, the method further comprises: cutting off the gas supply and sending out an alarm signal through an alarm self-contained in the cooker; and sending an air quantity up-regulating instruction to the external range hood so as to accelerate the discharge of smell generated by overflowed liquid.
6. The method of claim 5, wherein the method further comprises: The heating power of the kitchen range is adjusted down to a preset safe power, or heating is stopped; and when the confirmation operation of the user responding to the alarm signal is detected or the pot is detected to be restored in place, the heating power is up-regulated to the original set value.
7. The method of claim 1, wherein if there are at least two cooktops, the determining from the vibration amplitude statistic whether a pan event occurred comprises: calculating group consistency indexes corresponding to the vibration amplitude statistics; If abnormal vibration amplitude statistics larger than or equal to the group consistency index exist in the plurality of vibration amplitude statistics, acquiring a first quantity of the abnormal vibration amplitude statistics; Acquiring a second number of the vibration amplitude statistics, and determining an abnormal duty ratio according to the ratio of the first number to the second number; if the abnormal duty ratio is smaller than or equal to a duty ratio threshold value, a pot sliding event occurs to the stove corresponding to the abnormal vibration amplitude; and if the abnormal duty ratio is larger than the duty ratio threshold value, determining that the plurality of cookers do not have pot sliding events.
8. The pan detection device based on the vibration spectrum is characterized by comprising an acquisition module, a conversion module and a control module, wherein: The acquisition module is used for acquiring vibration signals of the surface of the kitchen range; The conversion module is used for carrying out frequency spectrum analysis on the vibration signal and extracting vibration amplitude information in a characteristic frequency band related to the pan sliding behavior; the control module is used for determining corresponding vibration amplitude statistics based on the vibration amplitude information and determining whether a skiing pan event occurs according to the vibration amplitude statistics.
9. An intelligent device is characterized by comprising a processor and a memory which is in communication connection with the processor; The memory stores computer-executable instructions; The processor executes computer-executable instructions stored in the memory to implement the method of any one of claims 1 to 7.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein computer executable instructions for implementing the pan detection method based on vibration spectrum according to any of claims 1 to 7 when executed by a processor.

Description

Method, device, equipment and storage medium for detecting skillet based on vibration spectrum Technical Field The application belongs to the technical field of intelligent household appliances, and particularly relates to a method, a device, equipment and a storage medium for detecting a skillet based on a vibration spectrum. Background Along with the intelligent upgrading of gas cookers and electromagnetic cookers, the demands of kitchen scenes on 'unattended and dangerous' are rapidly rising. The sliding pot is one of the hidden risks of daily frequent occurrence because of lateral sliding of the pot due to steam floating, oil film antifriction or slight inclination of the table top during cooking. The light side causes soup splashing and kitchen surface pollution, and the heavy side causes hot oil splashing, gas extinction leakage or dry burning of an electric heating disc to cause fire, so that personal and property safety is directly threatened, and the real-time sensing of the pan sliding event becomes a short capacity plate which is necessary to be complemented by the intelligent kitchen range. The existing skillet detection technology is mainly divided into two types, namely detection based on vibration signals and detection based on sound signals. Vibration data of the surface of the kitchen range is acquired through an acceleration sensor based on detection of the vibration signal, and time domain characteristics (such as slope change) or frequency domain characteristics (such as energy distribution) of the vibration signal are analyzed. Based on the detection of the sound signals, the sound data of the kitchen range area is collected through a microphone, and the sound characteristics related to the skillet are identified through audio characteristic analysis (such as spectrum matching and noise threshold judgment). However, the anti-interference capability of the scheme is insufficient, so that the vibration characteristics of the skillet and the environmental interference signals cannot be effectively distinguished, and the accuracy of skillet detection is reduced. Disclosure of Invention The application provides a skillet detection method, device, equipment and storage medium based on a vibration spectrum, which are used for solving the problems that the prior scheme is insufficient in anti-interference capability, cannot effectively distinguish the vibration characteristics of a skillet from an environment interference signal and reduces the accuracy rate of skillet detection. In a first aspect, the present application provides a method for detecting a pan based on a vibration spectrum, the method comprising: Acquiring a vibration signal of the surface of the kitchen range; Performing spectrum analysis on the vibration signal, and extracting vibration amplitude information in a characteristic frequency band related to the pan sliding behavior; and determining corresponding vibration amplitude statistics based on the vibration amplitude information, and determining whether a skiing event occurs according to the vibration amplitude statistics. In one possible embodiment, the determining whether a pan event occurs according to the vibration amplitude statistic includes: collecting cooking parameters of the kitchen range, and determining the current cooking stage of the kitchen range according to the change condition of the cooking parameters; inquiring a preset skillet judgment threshold relation based on the cooking stage and the data type of the vibration amplitude statistic to obtain a corresponding skillet judgment threshold; acquiring the magnitude relation between the vibration amplitude statistic and the pot-sliding judging threshold; And when the vibration amplitude statistic is greater than or equal to the skillet judgment threshold value, determining that the cooker has a skillet event. In one possible implementation, before the obtaining the magnitude relation between the vibration amplitude statistic and the pan determination threshold value, the method further includes: Collecting an environmental vibration signal of current environmental noise in a sliding window mode; Performing spectrum analysis on the environmental vibration signal to obtain a corresponding spectrum energy baseline; Multiplying the spectrum energy baseline by a preset proportionality coefficient to obtain a candidate threshold value which changes in real time along with environmental noise; determining whether the candidate threshold is less than the pot slide decision threshold; if yes, updating the skillet judging threshold value based on the candidate threshold value. In a possible implementation manner, the performing spectrum analysis on the vibration signal, extracting vibration amplitude information in a characteristic frequency band related to the pan sliding behavior, includes: Performing fast fourier transform on the vibration signal to obtain an amplitude spectrum; defining a characteristic frequency