CN113511162B - Alarm system for reminding children in vehicle of being detained - Google Patents
Alarm system for reminding children in vehicle of being detained Download PDFInfo
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- CN113511162B CN113511162B CN202110558092.5A CN202110558092A CN113511162B CN 113511162 B CN113511162 B CN 113511162B CN 202110558092 A CN202110558092 A CN 202110558092A CN 113511162 B CN113511162 B CN 113511162B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
- B60R21/01512—Passenger detection systems
- B60R21/0153—Passenger detection systems using field detection presence sensors
- B60R21/01534—Passenger detection systems using field detection presence sensors using electromagneticwaves, e.g. infrared
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/08—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using communication transmission lines
Abstract
The invention provides an alarm system for reminding children staying in a car, which comprises: the power supply module comprises a solar cell panel and a lithium battery and is used for continuously supplying power; the main control module is electrically connected with the power supply module; the detection module is arranged on the main driver seat and the assistant driver seat, is in communication connection with the main control module, and is used for detecting whether a person is in the vehicle after the vehicle is flamed out; the communication alarm module is in communication connection with the main control module and is used for sending an alarm short message to inform a vehicle owner; the vehicle window state reading and storing module is in communication connection with the main control module and is used for reading and storing the opening and closing states of the vehicle window; the timing/timing module is in communication connection with the infrared detection module and the main control module, is used for timing after the vehicle is flamed out, and is used for timing when the infrared detection module detects that a person is in the vehicle; the main control module is used for controlling the detection module, the communication alarm module, the vehicle window state reading and storing module and the timing/timing module to work.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to an alarm system for reminding children staying in a vehicle.
Background
Along with the increase of the number of automobiles, more and more families enjoy the convenience brought by the automobiles to people, meanwhile, the safety of children in the riding aspect is also regarded as important, the self-safety awareness of the children is very weak, and therefore once the children are detained in the automobiles by parents, safety problems are easy to occur. When the automobile is flamed out, the temperature in the automobile can change, harmful gas can be generated, and the danger of suffocation of children can be easily caused. Therefore, it is desirable to design an alarm system that can solve the above-mentioned problems.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an alarm system for reminding a child staying in a vehicle.
The invention provides an alarm system for reminding the retention of children in a vehicle, which is characterized by comprising: the power supply module comprises a solar cell panel and a lithium battery and is used for continuously supplying power; the main control module is electrically connected with the power supply module; the vehicle window state reading and storing module is in communication connection with the main control module and is used for reading and storing the opening and closing states of the vehicle window; the detection module is arranged on the main driver seat and the assistant driver seat, is in communication connection with the main control module, and is used for detecting whether a person is in the vehicle after the vehicle is flamed out; the timing/timing module is in communication connection with the detection module and the main control module, is used for timing after the vehicle is flamed out, and detects that people are in the vehicle for timing in the detection module; the communication alarm module is in communication connection with the main control module and is used for sending an alarm short message to inform a vehicle owner; wherein the main control module is used for controlling the operation of the car window state reading and storing module, the detecting module, the timing/timing module and the communication alarming module, when the automobile is started, the window state reading and storing module reads the window sensor data in the automobile control system at fixed time intervals, and records the opening state of the car window, and the detection module, the communication alarm module and the timing module do not work, when the door of the automobile is closed and flameout occurs, the detection module, the communication alarm module and the timing module start to work, firstly, the timing module starts to time, the detection module starts to detect, when the detection module detects the infrared radiation of the human body, and then, an alarm interval is determined through the recorded window state and the current timing value, and an alarm short message is sent to inform the vehicle owner through the communication alarm module.
In the alarm system for reminding the retention of children in the vehicle, the alarm system can also have the following characteristics: and the time interval between the window state reading and the window state reading of the storage module is less than 3 seconds.
In the alarm system for reminding the retention of children in the vehicle, the alarm system can also have the following characteristics: wherein, detection module adopts infrared sensor, and this infrared sensor's quantity is 4, installs respectively in the both sides of main driver's seat and the both sides of passenger seat, and apart from the high 1/4 ~ 1/3 department of cushion.
In the alarm system for reminding the retention of children in the vehicle, the alarm system can also have the following characteristics: the specific working process of the infrared sensor comprises the following steps:
step S1, obtaining continuous N times of values (N is larger than 10) of each infrared sensor by adopting a sliding window, and then calculating the average value MA (i, t) and the variance D (i, t) of the N times of detection values of each infrared sensor;
step S2, when the average value MA (i, t) of the infrared sensor is larger than the threshold, the infrared sensor is judged to be an effective sensor, then the ratio of the square of the average value of each effective sensor to the variance is calculated, the sum of the ratios of each effective sensor is calculated and recorded as the sum of the total ratios;
step S3, dividing the ratio of the effective sensors by the sum of the total ratios to obtain the weight value of each effective sensor;
step S4, taking the product of the average value of the effective sensors and the weight value of the effective sensors as the contribution value WMA (k, t) of each effective sensor to the fused data;
step S5, calculating the sum of the contribution values of the effective sensors to perform data fusion to obtain fused data, then judging the fused data values which are continuous multiple times, namely continuous early warning variables, when the continuous early warning variables do not exceed a threshold value, the continuous early warning variables are clear 0, the step S6 is performed, when the continuous early warning variables are added with 1, whether the continuous early warning variables are larger than a limited number of times is judged, when the continuous early warning variables are larger than the threshold value, the condition that children stay in the vehicle is judged, meanwhile, the continuous early warning variables are clear 0, the communication alarm module is started, the step S6 is performed, and when the continuous early warning variables are not larger than the threshold value, the step S6 is directly performed;
step S6, let t +1 → t, return to step S1,
wherein N is greater than10, i represents each infrared sensor, i is 1, 2, 3, 4, t represents time, and the formula of data fusion is data (t) Σ k WMA (k, t), data (t) represents the fused data obtained at time t, k representing the number of valid sensors.
In the alarm system for reminding the retention of children in the vehicle, the alarm system can also have the following characteristics: the timing/timing module comprises a timer and a timer, the timer starts timing when the vehicle is flamed out, when the detection module detects that a person exists in the vehicle, the timer starts working, and when the overflow value of the timer overflows, the communication alarm module sends an alarm short message to inform a vehicle owner.
In the alarm system for reminding the retention of children in the vehicle, the alarm system can also have the following characteristics: when the window is completely closed, reading the current timing value, wherein the larger the current timing value is, the smaller the timer overflow value is set, namely the longer the vehicle flameout time is, the smaller the alarm interval is, the more frequent the alarm is, when the window is opened, reading the current timing value, and the larger the current timing value is, the smaller the timer overflow value B is set, namely the longer the time is, the more frequent the alarm is, and under the condition that the current timing value is the same, the overflow value B is greater than the overflow value A, and setting T start For the current timing value, T Aalert The time corresponding to the overflow value A is calculated by the formula: t is Aalert ＝2 -Tstart K +60, and k 200, and then according to the master clock frequency and T Aalert Calculating an overflow value A, setting T start For the current timing value, T Balert For the time corresponding to the overflow value B, the calculation formula is: t is Balert ＝2 -Tstart K +90, and k 300, and then according to the master clock frequency and T Balert And calculating an overflow value B, wherein the unit of the overflow value A and the unit of the overflow value B are seconds.
Action and Effect of the invention
According to the alarm system for reminding the retention of children in the vehicle, which is disclosed by the invention, the alarm system is provided with the power supply module, so that the power can be continuously supplied to the system; because the vehicle window state reading and storing module is arranged, the open and closed states of the vehicle window can be read and stored; the detection module is arranged, so that whether a person is in the vehicle after the vehicle is shut down can be detected; the timing module is arranged, so that the timing module can be used for timing after the vehicle is shut off, and the detection module detects that a person is in the vehicle for timing; because the communication alarm module is arranged, the alarm short message can be sent to inform the owner.
Therefore, the alarm system for reminding the retention of children in the car can timely and efficiently send the alarm short message to the car owner when the children are retained in the car, and reduces the probability of accidents of the children in the car. In addition, when the system is under the vehicle starting state, can constantly read door window open and close state and take notes, when the vehicle stalled and the door was closed, the system can start the time-recorder, install four infrared sensor start detection in front seat side, the system can carry out data fusion to effective sensor's data, in order to reduce the wrong report alert, when the system detected human heat radiation, the system can send the warning SMS through communication alarm module and inform the car owner, can in time let the car owner go to the condition in the car, and the system can be according to the door window state of record and the current timing value of time-recorder and decide the warning interval.
Drawings
FIG. 1 is a functional block diagram of a system for alerting a child retention in a vehicle in an embodiment of the present invention;
FIG. 2 is a schematic block diagram of the installation position of a detection module of an alarm system for reminding a child staying in a vehicle according to an embodiment of the present invention;
FIG. 3 is a flow chart of the operation of the detection module of the alarm system for alerting the detention of a child in a vehicle in an embodiment of the present invention.
Detailed Description
In order to make the technical means and functions of the present invention easy to understand, the present invention is specifically described below with reference to the embodiments and the accompanying drawings.
Example (b):
FIG. 1 is a functional block diagram of a system for alerting a child to stay in a vehicle according to an embodiment of the present invention.
As shown in fig. 1, the present embodiment provides an alarm system 100 for reminding a child staying in a car, comprising: the vehicle window state monitoring system comprises a power supply module 10, a main control module 20, a vehicle window state reading and storing module 30, a detection module 40, a timing/timing module 50 and a communication alarm module 60.
The power supply module 10 includes a solar cell panel and a lithium battery for continuously supplying power.
In this embodiment, the power supply module 10 adopts a monocrystalline silicon solar panel with a rated voltage of 5V, and adopts a linear charging management chip TP4026 to manage the charging process of the lithium battery, and meanwhile, a lithium battery protection chip is used to cooperate with an MOS transistor to realize overcharge and overdischarge protection of the lithium battery.
Furthermore, the voltage range of the lithium battery is between 3.7V and 4.2V, and the working voltage of the main control module is 3.3V, so a low-dropout voltage regulator chip TPS733 needs to be selected to ensure that the system can normally supply power, the low-dropout voltage regulator chip TPS733 is connected to both sides of the power supply, the positive electrode is connected to the high voltage, and the negative electrode is connected to the output low voltage.
The main control module 20 is electrically connected to the power supply module 10, and is configured to control the operation of the window state reading and storing module 30, the detecting module 40, the timing/timing module 50, and the communication alarm module 60.
In this embodiment, the main control module 20 uses an STM32 chip.
The window state reading and storing module 30 is in communication connection with the main control module 20, and is configured to read and store the window opening and closing states, and a time interval between the window state reading and storing module 30 and the window state reading is less than 3 seconds.
In this embodiment, the time for reading the window state by the window state reading and storing module 30 is set to be recorded once every 1 second. The opening and closing states of the vehicle windows can be directly obtained through a vehicle control system during vehicle starting, a sensor does not need to be additionally arranged on the vehicle window position, and therefore cost is reduced and changes to the vehicle are reduced. The design here requires a short read interval, and since the read is only performed when the vehicle's own control system is running, no data can be obtained when the vehicle is shut down. If the reading interval is long, there may be a situation where the window state changes and stalls during the interval, where the recorded window state is erroneous, and in order to prevent such a situation, a short time interval must be set. When the vehicle is shut down, the window state acquisition is stopped, so that the last window state before the vehicle is shut down is recorded.
Fig. 2 is a schematic diagram of the installation position of a detection module of an alarm system for reminding a child staying in a vehicle in the embodiment of the invention.
As shown in fig. 2, the detection module 40 is installed on the primary driver seat and the secondary driver seat and is in communication connection with the main control module 20 for detecting whether a person is in the vehicle after the vehicle is turned off.
In this embodiment, the detection module 40 adopts an infrared sensor, the number of the infrared sensors is 4, the infrared sensors are respectively installed on two sides of a main driver seat and two sides of a front passenger seat, and the distance between the infrared sensors and the cushion is 1/4-1/3. The starting point of the design is that under the basic guarantee that the omnibearing detection is met, the position is relatively difficult to kick or touch, and meanwhile, the driving safety is not influenced. Because the detection range of one infrared sensor is only 120 degrees at most, the installation of one sensor is not enough to cover all the seats behind, and in order to ensure that the seats in the back row can be detected in an all-round manner, the infrared sensors are installed on the side surfaces of the main driver and the auxiliary driver, and the total number of the infrared sensors is 4. The seat behind the main driver is mainly detected by infrared sensors arranged on two sides of the main driver and an infrared sensor arranged on the inner side of the auxiliary driver, the position in the middle of the rear row is mainly detected by the infrared sensors arranged on the inner sides of the main driver and the auxiliary driver, and the seat behind the auxiliary driver is mainly detected by the infrared sensors arranged on two sides of the auxiliary driver and the infrared sensor arranged in the main driver. The system adopts infrared detection to modify the vehicle less, need not carry out big repacking to the seat unlike pressure sensor, infrared sensor as long as the installation just can firmly, in case children grow up later, just need not alarm system, demolish these 4 infrared sensors and have no influence to the vehicle almost.
The detection module 40 works as follows: when the automobile is flamed out, the detection module is started, at the moment, the 4 infrared sensors start to work, the infrared sensors detect 10-micron human body infrared radiation to work, the 10-micron infrared radiation can be gathered on the infrared induction source, the infrared induction source loses charge balance when receiving the change of the human body infrared radiation temperature, and charges are released outwards.
In an open space such as a corridor, a house entrance and the like, the infrared sensor can accurately detect a human body, but the space in the vehicle is closed and narrow, and other interference factors exist in the vicinity of a wavelength of 10 microns, so that the interference factors need to be eliminated from data obtained by the infrared sensor. Because the distance between a person and each sensor is different, the difference of data obtained by the measurement of the sensors at different positions is larger, and if the maximum value in the sensors is only taken for judgment, the probability of false judgment and false alarm is very high. The system fuses a plurality of effective sensor data, effectively detects human bodies, greatly reduces the probability of misjudgment and misinformation, and only the data of the effective sensors are used for final data fusion.
FIG. 3 is a flow chart of the operation of the detection module of the alarm system for alerting the detention of a child in a vehicle in an embodiment of the present invention.
As shown in fig. 3, the specific working process of the infrared sensor includes the following steps:
step S1, obtaining N consecutive times of values of each infrared sensor by using a sliding window, and then calculating an average MA (i, t) and a variance D (i, t) of the N detected values of each infrared sensor, where the formula is as follows:
MA(i，t)＝E[P(i)]
＝[P i (t)+P i (t-1)+……+P i (t-N+1)]/N(N＞10)
D(i，t)＝E[P i (t-k)-MA(i，t)] 2
step S2, when MA (i, t) > threshold a, the ith infrared sensor is an effective sensor, K infrared sensors are provided as effective sensors, K ═ 1, 2.. and K are used to represent the numbers of the effective sensors, and then the ratio of the square of the average value to the variance of each effective sensor is calculated respectively
And calculating the sum of the ratios of the effective sensors, and recording the sum as the sum of the total ratio M (t):
in step S3, the ratio of the valid sensors is divided by the sum of the total ratios to obtain a weight value W (k, t) of each valid sensor δ (k, t)/M.
Step S4, taking the product of the average value of the valid sensors and the weight value of the valid sensors as the contribution WMA (k, t) of each valid sensor to the fused data, and the formula is: WMA (k, t) ═ W (k, t) × MA (k, t).
Step S5, calculating the sum of the contribution values of the effective sensors to perform data fusion to obtain fused data, then judging the fused data value which is continuous multiple times, namely a continuous early warning variable, when the continuous early warning variable does not exceed a threshold value, namely a threshold B, the continuous early warning variable is clear 0, entering step S6, when the continuous early warning variable is added with 1, then judging whether the continuous early warning variable is greater than a threshold C, namely a limited number of times, when the continuous early warning variable is greater than the threshold C, judging that children are staying in the vehicle, clearing the continuous early warning variable 0, starting the communication alarm module and transferring to step S6, and when the continuous early warning variable is not greater than the threshold C, directly entering step S6.
In step S6, let t +1 → t, return to step S1.
Wherein, N is more than 10, i represents each infrared sensor, i is 1, 2, 3, 4, t represents time, the formula of data (t) sigma is data k WMA (k, t), data (t) represents the fused data obtained at time t, k representing the number of valid sensors.
In this embodiment, the threshold is related to device parameters, is determined by data acquired through experiments, and the continuous early warning variable is used to record how many times the threshold B is exceeded when the threshold B is continuously present.
In addition, the continuous warning variable in this embodiment is used to count how many times the threshold is exceeded in succession, so that no false alarm is generated. When the data exceeds the threshold for a plurality of consecutive times, which indicates that the judgment is not accidental misjudgment, the threshold C represents the number of times, and is generally 5 to 12 times.
Where MA (i, t) is the average of the ith sensor at time t, N is greater than 10, i represents each infrared sensor, i is 1, 2, 3, 4, representing 4 infrared sensors, pi (t) represents the data currently obtained by the ith sensor, k is 0, 1, 2, … …, N-1, and D (i, t) is the variance of the ith sensor at time t.
In this embodiment, the threshold in step S5 is related to the device parameter, and the data values of the threshold a and the threshold B are related to the circuit and the device parameter.
The timing/timing module 50 is in communication connection with the detection module 40 and the main control module 20, and is used for timing after the vehicle is shut down and timing when the detection module 40 detects that someone is in the vehicle.
In this embodiment, the timing module 50 includes a timer and a timer, the timer starts timing when the vehicle is turned off, when the detection module 40 detects that there is a person in the vehicle, the timer starts working, and when the overflow value of the timer overflows, the communication alarm module 6 sends an alarm short message to notify the vehicle owner.
In the embodiment, the overflow value is determined by the opening and closing states of the vehicle window and the current timing value, when the vehicle window is completely closed, the current timing value is read, the larger the current timing value is, the smaller the timer overflow value is set, namely, the longer the vehicle flameout time is, the smaller the alarm interval is, the more frequent the alarm is, when the vehicle window is opened, the current timing value is read, and when the current timing value is larger, the smaller the timer overflow value B is set, namely, the longer the time is, the more frequent the alarm is,
furthermore, under the condition that the current timing value is the same, the overflow value B is larger than the overflow value A, so that the design is that the window is opened only when the child is detained in the car sometimes, the child is not forgotten in the car, and frequent alarm is unnecessary.
Further, T is set start For the current timing value, T Aalert The time corresponding to the overflow value A is calculated by the formula:T Aalert ＝2 -Tstart k +60, and k 200, and then according to the master clock frequency and T Aalert Calculating an overflow value A, setting T start For the current timing value, T Balert The time corresponding to the overflow value B is calculated by the formula: t is Balert ＝2 -Tstart K +90, and k 300, and then according to the master clock frequency and T Balert An overflow value B is calculated.
The units of the overflow value A and the overflow value B are seconds.
The communication alarm module 60 is in communication connection with the main control module 20 and is used for sending an alarm short message to inform a vehicle owner.
In this embodiment, the communication alarm module 60 uses the SIM900A module, and the working frequency band is 900Mhz, so that the SMS data can be transmitted with low power consumption. STM32 sends corresponding AT command to the communication alarm module through serial port to realize the sending and receiving of short message.
The working process of the alarm system for reminding the child staying in the car of the embodiment is as follows:
in the alarm system 100 for reminding children staying in the vehicle of the embodiment, when the vehicle is started, the window state reading and storing module 30 reads the window sensor data in the vehicle control system at regular intervals and records the window opening state, and the detecting module 40, the communication alarm module 60 and the timing/timing module 50 do not work,
when the door of the automobile is closed and flameout, the detection module 40, the communication alarm module 60 and the timing/timing module 50 all start to work, firstly, the timing/timing module 50 starts to time, the detection module 40 starts to detect, when the detection module 40 detects human body infrared radiation, an alarm interval is determined through the recorded window state and the current timing value, and an alarm short message is sent to inform the owner of the automobile through the communication alarm module 60.
Effects and effects of the embodiments
According to the alarm system for reminding the retention of children in the vehicle, which is provided by the embodiment, the power supply module is arranged, so that the power can be continuously supplied to the system; because the vehicle window state reading and storing module is arranged, the open and closed states of the vehicle window can be read and stored; the detection module is arranged, so that whether a person is in the vehicle after the vehicle is shut down can be detected; the timing module is arranged, so that the timing module can be used for timing after the vehicle is shut off, and the detection module detects that a person is in the vehicle for timing; because the communication alarm module is arranged, the alarm short message can be sent to inform the owner.
According to the alarm system for reminding the retention of children in the automobile, the window state reading time interval and the window state reading time interval of the storage module are less than 3 seconds, so that the problem that the recorded window state is wrong does not occur.
According to the alarm system who is used for reminding children to be detained in car that this embodiment relates to, because detection module adopts infrared sensor, this infrared sensor's quantity is 4, installs respectively in the both sides of main driver's seat and the both sides of passenger seat, and apart from the high 1/4 ~ 1/3 department of cushion, so can carry out omnidirectional detection to the back row seat to it is less to adopt infrared detection technique to change the vehicle.
According to the alarm system for reminding children staying in the vehicle, the timing/timing module comprises the timer and the timer, so that the timer can be adopted to start timing when the vehicle is flamed out, when the detection module detects that a person exists in the vehicle, the timer starts to work, and when the overflow value of the timer overflows, the communication alarm module sends an alarm short message to inform a vehicle owner.
Therefore, the alarm system for reminding children to stay in the car of the embodiment can send alarm short messages to a car owner timely and efficiently when children stay in the car, and reduces the probability of accidents of the children in the car. In addition, when the system is under the vehicle starting state, can constantly read door window open and close state and take notes, when the vehicle stalled and the door was closed, the system can start the time-recorder, install four infrared sensor start detection in front seat side, the system can carry out data fusion to effective sensor's data, in order to reduce the wrong report alert, when the system detected human heat radiation, the system can send the warning SMS through communication alarm module and inform the car owner, can in time let the car owner go to the condition in the car, and the system can be according to the door window state of record and the current timing value of time-recorder and decide the warning interval.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (4)
1. An alarm system for reminding a child staying in a vehicle, comprising:
the power supply module comprises a solar cell panel and a lithium battery and is used for continuously supplying power;
the main control module is electrically connected with the power supply module;
the vehicle window state reading and storing module is in communication connection with the main control module and is used for reading and storing the opening and closing states of the vehicle window;
the detection module is arranged on the main driver seat and the assistant driver seat, is in communication connection with the main control module, and is used for detecting whether a person is in the vehicle after the vehicle is flamed out;
the timing/timing module is in communication connection with the detection module and the main control module, is used for timing after the vehicle is flamed out, and is used for timing when the detection module detects that people are in the vehicle; and
a communication alarm module which is in communication connection with the main control module and is used for sending alarm short messages to inform the car owner,
wherein the main control module is used for controlling the vehicle window state reading and storing module, the detecting module, the timing/timing module and the communication alarm module to work,
when the automobile is started, the window state reading and storing module reads the window sensor data in the control system of the automobile at fixed time intervals and records the opening state of the window, and the detecting module, the communication alarming module and the timing/timing module do not work,
when the door of the automobile is closed and flameout occurs, the detection module, the communication alarm module and the timing/timing module all start to work, firstly, the timing/timing module starts to time, the detection module starts to detect, when the detection module detects human body infrared radiation, an alarm interval is determined according to the recorded window state and the current timing value, and an alarm short message is sent to inform the owner of the automobile through the communication alarm module,
the detection modules adopt 4 infrared sensors which are respectively arranged at two sides of a main driver seat and two sides of a secondary driver seat and are at a distance of 1/4-1/3 from the cushion,
the specific working process of the infrared sensor comprises the following steps:
step S1, obtaining continuous N times of values of each infrared sensor by adopting a sliding window, and then calculating the average value MA (i, t) and the variance D (i, t) of the N times of detection values of each infrared sensor;
step S2, when the average value MA (i, t) of the infrared sensor is larger than the threshold, the infrared sensor is judged to be an effective sensor, then the ratio of the square of the average value of each effective sensor to the variance is calculated, the sum of the ratios of each effective sensor is calculated and recorded as the sum of the total ratios;
step S3, dividing the ratio of the effective sensors by the total ratio sum to obtain a weight value of each effective sensor;
step S4, taking the product of the average value of the effective sensors and the weight value of the effective sensors as the contribution value WMA (k, t) of each effective sensor to the fused data;
step S5, calculating the sum of the contribution values of the effective sensors to perform data fusion to obtain fused data, then judging the fused data values which are continuous multiple times, namely continuous early warning variables, when the continuous early warning variables do not exceed a threshold value, the continuous early warning variables are clear 0, the step S6 is performed, when the continuous early warning variables are added with 1, whether the continuous early warning variables are larger than a limited number of times is judged, when the continuous early warning variables are larger than the threshold value, the condition that children stay in the vehicle is judged, meanwhile, the continuous early warning variables are clear 0, the communication alarm module is started, the step S6 is performed, and when the continuous early warning variables are not larger than the threshold value, the step S6 is directly performed;
step S6, let t +1 → t, return to step S1,
wherein, N is more than 10, i represents each infrared sensor, i is 1, 2, 3, 4, t represents time, the formula of data (t) sigma is data k WMA (k, t), data (t) represents the fused data obtained at time t, k representing the number of valid sensors.
2. The warning system for reminding the retention of a child in a vehicle as claimed in claim 1, wherein:
and the time interval between the window state reading and the window state reading of the storage module is less than 3 seconds.
3. The warning system for reminding the retention of a child in a vehicle as claimed in claim 1, wherein:
wherein the timing/timing module comprises a timer and a timer,
the timer starts timing when the vehicle is shut down, when the detection module detects that a person is in the vehicle, the timer starts working, and when the overflow value of the timer overflows, the communication alarm module sends an alarm short message to inform a vehicle owner.
4. The warning system for alerting a child of a child's stay in a vehicle of claim 3, wherein:
wherein the overflow value is determined by the opening and closing state of the vehicle window and the current timing value,
when the window state is completely closed, reading the current timing value, when the current timing value is larger, setting the overflow value A of the timer to be smaller, namely the longer the vehicle flameout time is, the smaller the alarm interval is, the more frequent the alarm is,
when a vehicle window is opened, reading a current timing value, setting the overflow value B of the timer to be smaller when the current timing value is larger, namely alarming more frequently when the time is longer,
under the condition that the current timing value is the same, the overflow value B is larger than the overflow value A,
setting T start For the current timing value, T Aalert The time corresponding to the overflow value A is calculated by the formula: t is Aalert ＝2 -Tstart K +60, and k 200, and then according to the master clock frequency and T Aalert The overflow value a is calculated and,
setting T start For the current timing value, T Balert The time corresponding to the overflow value B is calculated by the formula: t is a unit of Balert ＝2 -Tstart K +90, and k 300, and then according to the master clock frequency and T Balert The overflow value B is calculated and,
the units of the overflow value A and the overflow value B are seconds.
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