CN117665717A - Method and device for detecting seat occupation and vehicle - Google Patents
Method and device for detecting seat occupation and vehicle Download PDFInfo
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Abstract
The application discloses a method and device for detecting seat occupation and a vehicle. The method comprises the following steps: receiving an echo pulse signal corresponding to the pulse signal in response to the pulse signal with the preset frequency transmitted by the signal module; when the frequency of the echo pulse signals is changed compared with the preset frequency and the number of echo pulse number signals with the changed frequency in the preset time is larger than a preset threshold value, acquiring the distance between a living body on the seat and the signal module; acquiring an included angle between a living body on the seat and the signal module; and determining the occupied seat according to the distance and the included angle between the living body on the seat and the signal module, and outputting a seat occupancy detection result. According to the embodiment of the application, the change of the frequency of the echo pulse indicates that an object on the tested seat is a living body, the defect that the living body cannot be detected through the pressure sensor is avoided, and the accuracy of seat occupation detection is improved.
Description
Technical Field
The present disclosure relates to the field of automotive technologies, and in particular, to a method and an apparatus for detecting seat occupancy, and a vehicle.
Background
Based on the detection of the occupancy of the seat arrangement of the motor vehicle, a seat belt ("seat belt reminder" or "SeatBeltReminder") can be fastened in particular for the vehicle seat as detected occupied and/or the corresponding airbag can be triggered as required, in particular only for the vehicle seat as detected occupied.
In the related art, whether a driver or a passenger is present in the seat, that is, whether the seat is occupied or not, can be detected by detecting the pressure of a human body from the seat surface by a pressure sensor mounted on the seat. The pressure sensor calculates whether passengers or drivers are on the seat according to the detected pressure value, and further obtains seat occupation information. However, when a user places an object on the seat, the occupancy detection by the pressure sensor may be erroneously recognized that a person is sitting on the seat, resulting in inaccurate detection.
Disclosure of Invention
Based on the above problems, the application provides a method and a device for detecting seat occupation and a vehicle, and the accuracy of seat occupation detection is improved.
The embodiment of the application discloses the following technical scheme:
in a first aspect, an embodiment of the present application provides a method for detecting a seat occupancy, the method including:
receiving an echo pulse signal corresponding to a pulse signal with preset frequency transmitted by a signal module;
when the frequency of the echo pulse signal is changed compared with the preset frequency and the number of echo pulse signals with the changed frequency in the preset time is larger than a preset threshold value, acquiring a first time difference value between the receiving time of the echo pulse signal with any frequency and the corresponding pulse signal transmitting time, and acquiring the distance between a living body on a seat and the signal module based on the first time difference value; acquiring a second time difference value between the two echo pulse signals, and acquiring an included angle between a living body on a seat and the signal module according to the second time difference value and the distance between the two signal receiving modules;
and determining the occupied seat according to the distance and the included angle between the living body on the seat and the signal module, and outputting a seat occupancy detection result.
Optionally, the position of the signal module is located in a range of a preset interval in front of the detected seat in the first direction, is close to any side of the side vehicle body in the second direction, and is located on the ceiling of the vehicle in the third direction; the first direction is the direction from the vehicle head to the parking space, the second direction is the direction from one side door to the other side door of the vehicle, and the third direction is the direction from the chassis to the vehicle roof.
Optionally, the receiving, in response to the pulse signal of the preset frequency transmitted by the signal module, an echo pulse signal corresponding to the pulse signal specifically includes:
acquiring the running speed of the vehicle;
and when the running speed of the vehicle rises to be higher than a first preset speed, responding to the pulse signal with preset frequency transmitted by the signal module, and receiving an echo pulse signal corresponding to the pulse signal.
Optionally, the method further comprises:
and stopping receiving the echo pulse signal corresponding to the pulse signal when the running speed of the vehicle is reduced below a second preset speed and is greater than the first preset speed.
Optionally, the method further comprises:
filtering the echo pulse signal and filtering noise signals in the echo pulse signal through Fourier transformation.
Optionally, the method further comprises:
when the included angle between the living body on the seat and the signal module is larger than a preset threshold value, correcting the preset time;
when the frequency of the echo pulse signal is changed compared with the preset frequency and the number of the echo pulse number signals with the changed frequency in the preset time after correction is larger than a preset threshold value, a first time difference value between the receiving time of the echo pulse signal with any frequency changed and the corresponding pulse signal transmitting time is obtained, and the distance between a living body on a seat and the signal module is obtained based on the first time difference value.
In a second aspect, an embodiment of the present application provides an apparatus for detecting a seat occupancy, the apparatus including: the device comprises a receiving module, an acquisition module and a detection module;
the receiving module is used for responding to the pulse signal with the preset frequency transmitted by the signal module and receiving an echo pulse signal corresponding to the pulse signal;
the acquisition module is used for acquiring a first time difference value between the receiving time of the echo pulse signal with any frequency change and the corresponding pulse signal transmitting time when the frequency of the echo pulse signal is changed compared with the preset frequency and the number of echo pulse number signals with the frequency change in the preset time is larger than a preset threshold value, and acquiring the distance between a living body on a seat and the signal module based on the first time difference value; acquiring a second time difference value between the two echo pulse signals, and acquiring an included angle between a living body on a seat and the signal module according to the second time difference value and the distance between the two signal receiving modules;
the detection module is used for determining the occupied seat according to the distance and the included angle between the living body on the seat and the signal module and outputting a seat occupation detection result.
Optionally, the receiving module is specifically configured to: acquiring the running speed of the vehicle; and when the running speed of the vehicle rises to be higher than a first preset speed, responding to the pulse signal with preset frequency transmitted by the signal module, and receiving an echo pulse signal corresponding to the pulse signal.
Optionally, the receiving module is further configured to stop receiving the echo pulse signal corresponding to the pulse signal when the running speed of the vehicle falls below a second preset speed and is greater than the first preset speed.
Optionally, the apparatus further comprises: a filtering module;
the filtering module is used for filtering the echo pulse signals and filtering noise signals in the echo pulse signals through Fourier transformation.
Optionally, the apparatus further comprises: a correction module;
the correction module is used for correcting the preset time when the included angle between the living body on the seat and the signal module is larger than a preset threshold value;
when the frequency of the echo pulse signal is changed compared with the preset frequency and the number of the echo pulse number signals with the changed frequency in the preset time after correction is larger than a preset threshold value, a first time difference value between the receiving time of the echo pulse signal with any frequency changed and the corresponding pulse signal transmitting time is obtained, and the distance between a living body on a seat and the signal module is obtained based on the first time difference value.
In a third aspect, embodiments of the present application provide a vehicle, the vehicle comprising: a signal module and a processor;
the signal module is used for transmitting pulse signals with preset frequency;
the processor is configured to perform a method of detecting seat occupancy as claimed in any one of the first aspects.
Compared with the prior art, the application has the following beneficial effects:
receiving an echo pulse signal corresponding to the pulse signal in response to the pulse signal with the preset frequency transmitted by the signal module; when the frequency of the echo pulse signals is changed compared with the preset frequency and the number of echo pulse signals with the changed frequency in the preset time is larger than a preset threshold value, acquiring a first time difference value between the receiving time of the echo pulse signals with the changed frequency and the corresponding pulse signal transmitting time, and acquiring the distance between a living body on a seat and a signal module based on the first time difference value; acquiring a second time difference value between two echo pulse signals, and acquiring an included angle between a living body on the seat and the signal module according to the second time difference value and the distance between the two signal receiving modules; and determining the occupied seat according to the distance and the included angle between the living body on the seat and the signal module, and outputting a seat occupancy detection result. The frequency of the echo pulse signal is not changed for the living body to be tested, and the heartbeat or the motion of the living body on the tested seat can cause the frequency of the echo pulse signal to change. Therefore, in the embodiment of the application, when the frequency of the echo pulse is changed, the living body on the tested seat is indicated to be the living body, the occupied seat is determined according to the distance and the included angle between the living body on the seat and the signal module, and the seat occupation detection result is output, so that the defect that the living body cannot be detected through the pressure sensor is avoided, and the accuracy of the seat occupation detection is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a flowchart of a method for detecting a seat occupancy according to an embodiment of the present application;
fig. 2 is a schematic diagram of a signal module installation position according to an embodiment of the present application;
fig. 3 is a schematic diagram of an acquired echo pulse signal according to an embodiment of the present application;
fig. 4 is a schematic diagram of calculating an included angle between a living body and a signal module on a seat according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a device for detecting seat occupancy according to an embodiment of the present application;
fig. 6 is a schematic application diagram of a method for detecting seat occupancy in a vehicle according to an embodiment of the present application.
Detailed Description
As described above, by detecting the human body pressure from the seat surface by the pressure sensor mounted on the seat, it is possible to detect whether there is a driver or a passenger on the seat, that is, whether the seat is occupied. The pressure sensor calculates whether passengers or drivers are on the seat according to the detected pressure value, and further obtains seat occupation information. However, when a user places a certain living body on the seat, the occupancy detection by the pressure sensor may be erroneously recognized that a person is sitting on the seat, resulting in inaccurate detection.
In order to solve the above technical problems, an embodiment of the present application provides a method for detecting a seat occupancy. Receiving an echo pulse signal corresponding to the pulse signal in response to the pulse signal with the preset frequency transmitted by the signal module; determining a seat corresponding to the echo pulse signal according to an angle of the direction of the echo pulse signal compared with the vertical direction of the mounting position of the signal module; if the frequency of the echo pulse signal is larger than the preset amplitude threshold value compared with the variation amplitude of the preset frequency, and the variation duration is larger than the first preset time threshold value, the seat corresponding to the echo pulse signal is occupied.
In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Referring to fig. 1, a flowchart of a method for detecting a seat occupancy according to an embodiment of the present application is provided.
As shown in fig. 1, the method includes:
s101: and receiving an echo pulse signal corresponding to the pulse signal in response to the pulse signal with the preset frequency transmitted by the signal module.
Specifically, a running speed of the vehicle is acquired; when the running speed of the vehicle rises above a first preset speed, an echo pulse signal corresponding to the pulse signal is received in response to the pulse signal with the preset frequency transmitted by the signal module.
The first preset speed may be 0, i.e. wake-up signal module after the vehicle starts, starting the seat occupancy detection. It will be appreciated that the first preset speed may be set or modified in response to a user seeking. By setting the first travel speed to 0, it is possible to detect the occupied seat by the seat when the vehicle is started, and to carry out a seat belt reminder for the occupied seat.
The signal module may be an Ultra Wide Band (UWB) module, and the UWB module adopts UWB technology. Among them, UWB technology is a wireless carrier communication technology, which does not use a sinusoidal carrier, but uses non-sinusoidal narrow pulses of nanosecond order to transmit data, so that it occupies a wide spectrum.
It will be appreciated that the frequency of the echo pulse signal depends on whether or not relative motion occurs between the signal module and the living being under test. When no relative motion occurs between the signal module and the measured living body, the frequency of the echo pulse signal is equal to the preset frequency; when the relative motion occurs between the signal module and the tested living body, the frequency of the echo pulse signal is changed compared with the preset frequency. The relative movement may be a relative movement generated by an action of a living body, or a relative movement generated by a heartbeat of the living body.
In an alternative embodiment, a schematic diagram of the mounting location of the signal module is shown in fig. 2. The position of the UWB module is positioned in a preset interval range in front of the detected seat in a first direction (X), is close to any side of the side vehicle body in a second direction (Y), and is positioned on the ceiling of the vehicle in a third direction (H); the first direction (X) is the direction from the vehicle head to the parking space, the second direction (Y) is the direction from one side door to the other side door of the vehicle, and the third direction (H) is the direction from the chassis to the vehicle roof.
Wherein the preset interval can be in the range of 5-10cm in front of the detected seat. It will be appreciated that each row of seats requires the installation of a corresponding signal module for detecting whether the corresponding row of seats is occupied. The signal module directionally detects the seat position, so that the space in the vehicle can be effectively prevented from being blocked, and the difference of the angle and the distance data of the original data acquired by different seat positions can be greatly improved, so that the accuracy of the algorithm output result is improved. According to the embodiment of the application, the mode that the pressure sensor is stuck and fixed can be effectively avoided through the signal module arranged on the roof, and the problem that the seat occupancy detection function is failed in probability or fails in total is caused by repeated jolting and extrusion of an occupant when the occupant takes the seat.
It should be appreciated that detecting seat occupancy in real time will increase the power consumption of the vehicle. For this reason, when the traveling speed of the vehicle falls below the second preset speed and is greater than the first preset speed, the reception of the echo pulse signal corresponding to the pulse signal is stopped.
Wherein the second travel speed may be 5Km/h, the continuous detection is started when the travel speed of the vehicle is greater than 5Km/h, and the detection is stopped when the travel speed of the vehicle is less than 5 Km/h. By setting the second travel speed to 5km/h, the corresponding airbag can be triggered as required when the vehicle travel speed is greater than 5 km/h.
S102: when the frequency of the echo pulse signals is changed compared with the preset frequency and the number of echo pulse signals with the changed frequency in the preset time is larger than a preset threshold value, acquiring a first time difference value between the receiving time of the echo pulse signals with the changed frequency and the corresponding pulse signal transmitting time, and acquiring the distance between a living body on a seat and a signal module based on the first time difference value; and acquiring a second time difference value between the two echo pulse signals, and obtaining an included angle between a living body on the seat and the signal module according to the second time difference value and the distance between the two signal receiving modules.
S102 can be explained in the following two steps:
first, whether the seat is occupied by a living body is judged by the change of the echo pulse frequency.
It should be understood that when the amplitude of the change in the frequency of the echo signal is greater than the preset threshold value and the number of echo pulse number signals whose frequency is changed within the preset time is greater than the preset threshold value, it indicates that the corresponding seat is occupied by the living body.
Wherein, the relative motion between the signal module and the tested living body can lead to the phase change of the echo pulse signal. The difference of the heart beat of the adult and the infant leads to different relative movements between the signal module and the tested living body, and further leads to different phase changes of the echo pulse signals. Therefore, the superposition of the variation ranges of the adult and the child serves as a preset phase threshold value, and the phase threshold value is converted into a frequency threshold value for judging whether the frequency of the echo pulse signal is changed due to the living body on the seat.
In an alternative embodiment, using a slow time calculation method as shown in fig. 3, the passenger heartbeat may cause the echo pulse phase to change continuously with the passenger heartbeat, and over a certain number of pulse counts, when the number of pulses exceeds the threshold, the corresponding seat is considered occupied by the living body. The threshold value can be set or corrected according to the requirements of the user.
The accuracy of the seat occupied by the living body can be improved by overlapping the variation range of the adult and the children as a preset phase threshold value, and the accuracy of the seat occupied can be improved by shielding the frequency variation caused by the interference action through the number of echo pulses with the frequency variation within the preset time.
Second, after it is determined that the seat is occupied by the living body, the occupied seat is determined.
(1) The method comprises the steps of obtaining a first time difference value between the receiving time of echo pulse signals with any frequency change and the corresponding transmitting time of pulse signals, and obtaining the distance between a living body on a seat and a signal module based on the first time difference value.
It will be appreciated that the signal transmitter will record the time at which the pulse signal was sent and the signal receiver will record the time at which the echo pulse was received.
Specifically, when the frequency of the echo pulse signal changes, the time for receiving the echo pulse signal can be obtained, the occurrence time of the corresponding pulse signal can be obtained, and then the first time difference value between the receiving time of the echo pulse signal with the changed frequency and the corresponding pulse signal transmitting time is obtained; multiplying the first time difference by the pulse flight speed (equal to the speed of light) to obtain twice the distance between the living body on the seat and the signal module; dividing this distance by 2 gives the distance between the living body on the seat and the signal module.
(2) And acquiring a second time difference value between the two echo pulse signals, and obtaining an included angle between a living body on the seat and the signal module according to the second time difference value and the distance between the two signal receiving modules.
As an example, the signal module is installed on the right side as shown in (a) of fig. 4, and its angle is shown in (b) of fig. 4. In fig. 4, T is shorthand for a signal transmitter TX in a signal module in a two-dimensional plane, R is shorthand for a signal receiver RX in the signal module, d is a distance between two signal receivers RX, and θ is an angle between a living body on a seat and a UWB module.
The Δr may be calculated according to the second time difference between the echo pulse signals received by the two signal receivers RX and the pulse flight speed, and then the included angle θ between the living body on the angle seat and the signal module is calculated according to Δr=dsin θ.
S103: and determining the occupied seat according to the distance and the included angle between the living body on the seat and the signal module, and outputting a seat occupancy detection result.
Specifically, the specific position of the living body on the seat is obtained according to the distance and the included angle between the living body on the seat and the signal module; and determining the seat information occupied by the living body according to the specific position of the living body, and further outputting a seat occupancy detection result.
Receiving an echo pulse signal corresponding to the pulse signal in response to the pulse signal with the preset frequency transmitted by the signal module; when the frequency of the echo pulse signals is changed compared with the preset frequency and the number of echo pulse signals with the changed frequency in the preset time is larger than a preset threshold value, acquiring a first time difference value between the receiving time of the echo pulse signals with the changed frequency and the corresponding pulse signal transmitting time, and acquiring the distance between a living body on a seat and a signal module based on the first time difference value; acquiring a second time difference value between two echo pulse signals, and acquiring an included angle between a living body on the seat and the signal module according to the second time difference value and the distance between the two signal receiving modules; and determining the occupied seat according to the distance and the included angle between the living body on the seat and the signal module, and outputting a seat occupancy detection result. The frequency of the echo pulse signal is not changed for the living body to be tested, and the heartbeat or the motion of the living body on the tested seat can cause the frequency of the echo pulse signal to change. Therefore, in the embodiment of the application, when the frequency of the echo pulse is changed, the living body on the tested seat is indicated to be the living body, the occupied seat is determined according to the distance and the included angle between the living body on the seat and the signal module, and the seat occupation detection result is output, so that the defect that the living body cannot be detected through the pressure sensor is avoided, and the accuracy of the seat occupation detection is improved.
In addition, in order to avoid the interference caused by similar scenes such as the swing of the arms of the user above the empty seat, time parameters are introduced, when the angle corresponding to the detected echo does not correspond to the direction of the seat, the detection time is dynamically prolonged, the number of data sets is increased, and the detection accuracy is improved.
Specifically, when the included angle between the living body on the seat and the signal module is larger than a preset threshold value, correcting the preset time; when the frequency of the echo pulse signal is changed compared with the preset frequency and the number of the echo pulse number signals with the changed frequency in the corrected preset time is larger than a preset threshold value, a first time difference value between the receiving time of the echo pulse signal with any frequency and the corresponding pulse signal transmitting time is obtained, and the distance between the living body on the seat and the signal module is obtained based on the first time difference value.
As an example, when the angle corresponding to the detected echo pulse corresponds to the range of 10 degrees of the seat direction, a sampling period p×pri seconds outputs a occupying result; however, when the angle corresponding to the detected echo exceeds the range corresponding to the seat direction of 10 degrees, after one sampling period is finished, N sampling periods are dynamically compensated, the acquired data volume is increased, and the detection accuracy is improved.
Wherein, P is the number of emitted pulses per second, PRI is the time length of each pulse sequence, and p×pri is the time of data acquisition. It will be appreciated that the number of pulses emitted per second P may be adjusted according to the confidence level, typically P PRI is less than 10 seconds.
Referring to fig. 5, fig. 5 an embodiment of the present application provides an apparatus for detecting a seat occupancy, the apparatus including: a receiving module 501, an acquiring module 502 and a detecting module 503;
a receiving module 501, configured to receive an echo pulse signal corresponding to the pulse signal in response to the pulse signal of the preset frequency transmitted by the signal module;
the acquiring module 502 is configured to acquire a first time difference value between a receiving time of an echo pulse signal with a changed frequency and a corresponding pulse signal transmitting time when the frequency of the echo pulse signal is changed compared with a preset frequency and the number of echo pulse number signals with the changed frequency in a preset time is greater than a preset threshold, and acquire a distance between a living body on a seat and the signal module based on the first time difference value; acquiring a second time difference value between two echo pulse signals, and acquiring an included angle between a living body on the seat and the signal module according to the second time difference value and the distance between the two signal receiving modules;
and the detection module 503 is used for determining the occupied seat according to the distance and the included angle between the living body on the seat and the signal module and outputting the seat occupancy detection result.
Optionally, the receiving module 501 is specifically configured to: acquiring the running speed of the vehicle; when the running speed of the vehicle rises above a first preset speed, an echo pulse signal corresponding to the pulse signal is received in response to the pulse signal with the preset frequency transmitted by the signal module.
Optionally, the receiving module 501 is further configured to stop receiving the echo pulse signal corresponding to the pulse signal when the running speed of the vehicle falls below the second preset speed and is greater than the first preset speed.
Optionally, the apparatus further comprises: a filtering module;
and the filtering module is used for filtering the echo pulse signals and filtering noise signals in the echo pulse signals through Fourier transformation.
Optionally, the apparatus further comprises: a correction module;
the correcting module is used for correcting the preset time when the included angle between the living body on the seat and the signal module is larger than a preset threshold value; when the frequency of the echo pulse signal is changed compared with the preset frequency and the number of the echo pulse number signals with the changed frequency in the corrected preset time is larger than a preset threshold value, a first time difference value between the receiving time of the echo pulse signal with any frequency and the corresponding pulse signal transmitting time is obtained, and the distance between the living body on the seat and the signal module is obtained based on the first time difference value.
In addition, an embodiment of the present application provides a vehicle including: a signal module and a processor;
the signal module is used for transmitting pulse signals with preset frequency;
the processor is configured to perform a method of detecting seat occupancy as in any of the previous embodiments.
The signal module is connected with the UWB algorithm unit in the processor through the automobile CAN bus.
Referring to fig. 6, fig. 6 is a schematic application diagram of a method for detecting a seat occupancy in a vehicle according to an embodiment of the present application. Obtaining a detection signal through a UWB module; the processor obtains a detection result according to the detection signal; the processor sends the detection result to the CAN signal receiving and transmitting unit; and finally, the CAN signal receiving and transmitting unit transmits the detection result to the vehicle-mounted TBOX. The vehicle-mounted TBOX carries out corresponding operations such as seat belt reminding or airbag ejection and the like according to the detection result.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. In particular, for the device and vehicle embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points. The apparatus and vehicle embodiments described above are merely illustrative, wherein elements illustrated as separate elements may or may not be physically separate, and elements illustrated as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The foregoing is merely one specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method of detecting seat occupancy, the method comprising:
receiving an echo pulse signal corresponding to a pulse signal with preset frequency transmitted by a signal module;
when the frequency of the echo pulse signal is changed compared with the preset frequency and the number of echo pulse signals with the changed frequency in the preset time is larger than a preset threshold value, acquiring a first time difference value between the receiving time of the echo pulse signal with any frequency and the corresponding pulse signal transmitting time, and acquiring the distance between a living body on a seat and the signal module based on the first time difference value; acquiring a second time difference value between the two echo pulse signals, and acquiring an included angle between a living body on a seat and the signal module according to the second time difference value and the distance between the two signal receiving modules;
and determining the occupied seat according to the distance and the included angle between the living body on the seat and the signal module, and outputting a seat occupancy detection result.
2. The method of claim 1, wherein the signal module is positioned within a predetermined range of the front of the seat being inspected in a first direction, proximate either side of the body in a second direction, and in a third direction at the roof of the vehicle; the first direction is the direction from the vehicle head to the parking space, the second direction is the direction from one side door to the other side door of the vehicle, and the third direction is the direction from the chassis to the vehicle roof.
3. The method according to claim 1, wherein the receiving the echo pulse signal corresponding to the pulse signal in response to the pulse signal of the preset frequency transmitted by the signal module specifically comprises:
acquiring the running speed of the vehicle;
and when the running speed of the vehicle rises to be higher than a first preset speed, responding to the pulse signal with preset frequency transmitted by the signal module, and receiving an echo pulse signal corresponding to the pulse signal.
4. A method according to claim 3, characterized in that the method further comprises:
and stopping receiving the echo pulse signal corresponding to the pulse signal when the running speed of the vehicle is reduced below a second preset speed and is greater than the first preset speed.
5. The method according to claim 1, wherein the method further comprises:
filtering the echo pulse signal and filtering noise signals in the echo pulse signal through Fourier transformation.
6. The method according to any one of claims 1-5, further comprising:
when the included angle between the living body on the seat and the signal module is larger than a preset threshold value, correcting the preset time;
when the frequency of the echo pulse signal is changed compared with the preset frequency and the number of the echo pulse number signals with the changed frequency in the preset time after correction is larger than a preset threshold value, a first time difference value between the receiving time of the echo pulse signal with any frequency changed and the corresponding pulse signal transmitting time is obtained, and the distance between a living body on a seat and the signal module is obtained based on the first time difference value.
7. An apparatus for detecting seat occupancy, the apparatus comprising: the device comprises a receiving module, an acquisition module and a detection module;
the receiving module is used for responding to the pulse signal with the preset frequency transmitted by the signal module and receiving an echo pulse signal corresponding to the pulse signal;
the first obtaining module is configured to obtain a first time difference value between a receiving time of the echo pulse signal with any frequency being changed and a corresponding pulse signal transmitting time when the frequency of the echo pulse signal is changed compared with the preset frequency and the number of echo pulse number signals with the frequency being changed in the preset time is greater than a preset threshold, and obtain a distance between a living body on a seat and the signal module based on the first time difference value; acquiring a second time difference value between the two echo pulse signals, and acquiring an included angle between a living body on a seat and the signal module according to the second time difference value and the distance between the two signal receiving modules;
the detection module is used for determining the occupied seat according to the distance and the included angle between the living body on the seat and the signal module and outputting a seat occupation detection result.
8. The apparatus of claim 7, wherein the signal module is positioned within a predetermined range of the front of the seat being inspected in a first direction, proximate either side of the body in a second direction, and in a third direction at the roof of the vehicle; the first direction is the direction from the vehicle head to the parking space, the second direction is the direction from one side door to the other side door of the vehicle, and the third direction is the direction from the chassis to the vehicle roof.
9. The apparatus of claim 7, wherein the receiving module is specifically configured to:
acquiring the running speed of the vehicle;
and when the running speed of the vehicle rises to be higher than a first preset speed, responding to the pulse signal with preset frequency transmitted by the signal module, and receiving an echo pulse signal corresponding to the pulse signal.
10. A vehicle, characterized in that the vehicle comprises: a signal module and a processor;
the signal module is used for transmitting pulse signals with preset frequency;
the processor is configured to perform the method of detecting seat occupancy as claimed in any one of claims 1-6.
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| CN202311678005.5A CN117665717A (en) | 2023-12-07 | 2023-12-07 | Method and device for detecting seat occupation and vehicle |
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| CN202311678005.5A CN117665717A (en) | 2023-12-07 | 2023-12-07 | Method and device for detecting seat occupation and vehicle |
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