CN110989045A - Rainfall detection device for movable carrier and unmanned vehicle - Google Patents
Rainfall detection device for movable carrier and unmanned vehicle Download PDFInfo
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- CN110989045A CN110989045A CN201911114736.0A CN201911114736A CN110989045A CN 110989045 A CN110989045 A CN 110989045A CN 201911114736 A CN201911114736 A CN 201911114736A CN 110989045 A CN110989045 A CN 110989045A
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- rainfall detection
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- G01—MEASURING; TESTING
- G01W—METEOROLOGY
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- G01W1/14—Rainfall or precipitation gauges
Abstract
The invention relates to a rainfall detection device for a movable carrier and an unmanned vehicle, which can measure the rainfall without using a wiper device in the movable carrier by adopting a contact type sensing element, reduces the equipment requirement for detecting the rainfall of the vehicle and is particularly suitable for the rainfall measurement requirement of the unmanned vehicle.
Description
Technical Field
The present invention relates to a rainfall detection technique of a movable carrier, and more particularly, to a contact type rainfall detection device in an unmanned vehicle.
Background
The rainfall sensor is used for detecting the change of weather, and when raindrops fall, the rainfall sensor can measure the rainfall, so that a vehicle or a driver can take corresponding measures conveniently.
In the prior art, a rainfall sensor used on a movable vehicle is developed by adopting an optical principle, accurate measurement can be realized only by wiping raindrops with a wiper in a matching way, and if no wiper exists, the raindrops can be retained on glass, so that measurement failure is caused. Therefore, with the development and popularization of the unmanned vehicle technology, a wiper device such as a wiper blade and the like does not need to be arranged on the unmanned vehicle, and therefore a rainfall measuring device particularly suitable for the unmanned vehicle is urgently needed. And the optical measurement signal analyzes the optical signal, and the interference resistance (such as electromagnetic interference) of the optical measurement signal is weak.
Secondly, in the prior art, the rainfall sensor and the external device have poor interference resistance through transmission protocols such as RS485, RS232, UART and the like, which may cause that information cannot be transmitted to the external device in time, and compatibility with the external device (such as a general controller on a vehicle or a controller of each device) is also poor.
In addition, the rainfall sensor for the vehicle in the prior art only works in a vehicle starting state (needs to be powered by a vehicle complete machine), so that the rainfall condition cannot be known in advance before the vehicle is started to make a decision, or the sensor needs to be preheated for a period of time after being started to obtain a more accurate measurement value, so that the rainfall information cannot be immediately provided to help quickly make a mode decision when the vehicle is started.
Disclosure of Invention
In order to solve the above-described problems, according to a first aspect of the present invention, there is provided a rainfall detection device for a movable carrier, characterized in that the rainfall detection device has a sensing acquisition section and a control processing section;
the sensor acquisition part comprises a contact type sensing element and acquires rainfall sensing signals through the contact type sensing element; and the control processing part receives the rainfall sensing signal and processes the rainfall sensing signal to obtain rainfall information.
The invention can measure the rainfall without using a wiper device in the movable carrier by adopting the contact type sensing element, reduces the equipment requirement on detecting the rainfall of the vehicle and is particularly suitable for the rainfall measurement requirement of an unmanned vehicle.
Further, the touch sensor element is a force sensor element.
Further, the rainfall sensing signal comprises a pressure amplitude signal and a vibration frequency signal.
Further, the pressure amplitude signal is a peak-to-trough difference value of the single falling rain impact pressure distributed in the time domain.
Further, the rainfall detection device is also provided with an information communication part for sending the rainfall information to external equipment;
the external device includes: other devices of the mobile carrier, a cloud server and/or a user terminal.
Further, the information communication unit transmits the rainfall information to the external device based on a CAN and/or Lin protocol.
Furthermore, the rainfall detection device can continue to collect the rainfall sensing signal after the movable carrier is closed.
Further, after the whole movable carrier is closed, the rainfall detection device is provided with a measurement state section capable of collecting rainfall sensing signals and a measurement stopping state section for stopping collecting the rainfall sensing signals.
Further, after the movable carrier is closed, the rainfall detection device is switched to the measurement state section after a first preset time interval; or, the measurement state section is switched to after the first preset time node is reached.
Further, the control processing part determines the first predetermined time interval and the first preset time node according to weather forecast information of the location of the movable carrier.
Further, after the whole movable carrier is closed, the rainfall detection device is switched to the measurement stopping state section after a second preset time interval; or, after reaching a second preset time node, switching to the measurement stopping state segment.
Further, the control processing part determines the second predetermined time interval and the second preset time node according to weather forecast information of the location of the movable carrier.
Further, the sensing surface of the sensing acquisition part is arranged obliquely with respect to the traveling direction of the movable carrier.
Further, the sensing surface of the sensing acquisition part comprises a cambered surface.
In a second aspect of the present invention, there is provided an unmanned vehicle having a rainfall detection device as described above.
Further, the unmanned vehicle is not provided with a wiper device at the installation position of the rainfall detection device.
Drawings
Fig. 1 is a schematic front view of the rainfall detection device of the present invention.
Fig. 2 is a schematic side view of the rainfall detection device of the present invention when the vehicle is running.
Fig. 3 is a schematic view showing the configuration of the rainfall detection device and the configuration of the external device in the unmanned vehicle according to the present invention.
Description of reference numerals:
1-a sensing acquisition part; 2-a control processing section; and 3, an information communication part.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be noted that the terms "first," "second," "third," and the like in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
For the purpose of facilitating an understanding of the present application, the technical solutions provided in the present application will be described in detail below with reference to specific embodiments. In the present invention, the technical features of the embodiments and the technical features of the embodiments may be combined with each other without conflict.
Referring to fig. 1 to 3, the present invention relates to a rainfall detection device for a movable carrier (such as an unmanned vehicle) having a sensing acquisition section 1 and a control processing section 2. The sensor acquisition part 1 comprises a contact type sensing element and acquires rainfall sensing signals through the contact type sensing element; the control processing part receives the rainfall sensing signal and processes the rainfall sensing signal to obtain rainfall information.
The invention can measure the rainfall without using a wiper device in the movable carrier by adopting the contact type sensing element, reduces the equipment requirement on detecting the rainfall of the vehicle and is particularly suitable for the rainfall measurement requirement of an unmanned vehicle.
Preferably, the touch sensor element can be a force sensor element, in particular a pressure sensor element. However, the present invention is not limited to this, and the touch sensor element may be a displacement sensor, an angle sensor, or the like.
In one embodiment of the invention, the touch sensitive element is a force sensitive element and the rainfall information is determined based on one of a pressure amplitude signal or a vibration frequency signal detected by the force sensitive element during rainfall. Based on vibration frequency signal analysis, the capacity of resisting electromagnetic interference can be effectively achieved, and the accuracy and the applicability of rainfall detection are improved.
During rainfall, the force applied to the sensor by the raindrops is interval or pulse in time, so that a vibration frequency signal can be obtained; similarly, a single raindrop exerts a force on the sensor, which is an increase and then a decrease in time, thereby generating a pressure amplitude signal. The present invention may determine the rainfall information using one of a pressure amplitude signal or a vibration frequency signal. Specifically, discrete values of a plurality of corresponding pressure amplitude signals or vibration frequency signals at different rainfall amounts can be measured in advance, and a corresponding fitting relation curve function is obtained based on a big data fitting mode. In practical application, the actual rainfall can be determined according to the fitting relation obtained in advance by actually measuring a force amplitude signal or a vibration frequency signal.
In another embodiment of the present invention, it is further preferred that the rainfall sensing signal comprises a pressure amplitude signal and a vibration frequency signal. I.e. both to determine the rainfall information. Further research in the application finds that: if when utilizing pressure amplitude signal alone, can't effectively distinguish whether the pressure differential that foreign matter such as leaf led to when the raindrop size is the same and raindrop density is different, cause the degree of difficulty of confirming the rainfall size to increase. Correspondingly, if when vibration frequency signals are independently utilized, errors are easily caused when raindrops with the same density and different sizes are faced, and the rainfall size is inaccurate.
In another embodiment of the present invention, it is further preferable that the pressure amplitude signal is a peak-to-valley difference of a single rain impact pressure distribution in a time domain. The research of the application finds that other determination modes (such as waveform effective values) for determining the pressure amplitude signal relative to the amplitude by utilizing the peak value have more obvious discrimination on raindrops with different sizes, so that the determination of the rainfall size is more facilitated.
In one embodiment of the present invention, the rainfall detection device further has an information communication section 3 for transmitting the rainfall information to an external apparatus; referring to fig. 3, the external device includes: other devices of the mobile carrier, a cloud server and/or a user terminal. Here, the other device of the movable carrier may include an overall controller of the carrier or a subsystem controller of its respective functional parts.
In another embodiment of the present invention, the information communication part transmits the rainfall information to the external device based on the CAN and/or Lin protocol. By adopting the CAN or Lin communication protocol, the measurement result is more reliable, and the method CAN be well compatible with other controllers in the vehicle.
In one embodiment of the invention, the rainfall detection device can continue to collect rainfall sensing signals after the whole movable carrier is closed. Therefore, the invention can keep collecting the rainfall sensing signal in the non-starting state (such as the parking state) of the vehicle, so that the vehicle, the cloud server or the user can use the collected signal to make the corresponding mode decision in advance or immediately before or at the beginning of the next vehicle starting. For example, the user can determine whether to turn on the drain or turn on an anti-fog heating device or the like that avoids the generation of fog, depending on the magnitude of the amount of rain, before the vehicle starts running. Or, the rainfall information can be immediately obtained at the beginning of the vehicle starting so as to quickly make a decision on a corresponding mode (in the prior art, due to the fact that the sensor detects the rainfall information for a certain period of time, the rainfall information is stable and relatively accurate only in the measurement value after the sensor detects the rainfall information for a certain period of time, and thus the accurate rainfall information can be obtained after the vehicle starts for a certain period of time).
In another embodiment of the invention, after the whole movable carrier is closed, the rainfall detection device is provided with a measurement state section capable of collecting the rainfall sensing signal and a measurement stopping state section for stopping collecting the rainfall sensing signal. Therefore, the method can be switched between the two states of the measurement state section and the measurement stopping state section, thereby effectively saving resources, reducing power consumption and prolonging the service life of the sensor.
After the whole movable carrier is closed, the rainfall detection device is switched to a measurement state section after a first preset time interval; or, after the first preset time node is reached, the measurement state section is switched to. After the whole movable carrier is closed, the rainfall detection device is switched to a measurement stopping state section after a second preset time interval; or, after reaching the second preset time node, the terminal enters a measurement stopping state section. First and second predetermined time intervals, such as 3 hours or 6 hours, first and second predetermined time nodes, such as 9 am to 6 pm, where 9 am may be considered the first predetermined time node and 6 pm may be considered the second predetermined time node.
Due to the fact that the second preset time interval or the second preset time node is set, on one hand, the sensor can continue to work for a period of time after the carrier is closed, and therefore the problem that a user can not quickly acquire current rainfall information because the carrier is restarted in a short period is avoided. On the other hand, the sensor can jump out of the measurement state section as the end after entering the measurement state section, thereby effectively saving resources, reducing power consumption and prolonging the service life of the sensor.
Due to the setting of the first predetermined time interval or the first predetermined time node, the sensor may be intermittently brought into the measurement state segment to perform the measurement operation, or may be re-brought into the measurement state segment when deemed necessary (for the case where necessary, see further the description below in connection with the weather forecast information). Thereby effectively saving resources, reducing power consumption and prolonging the service life of the sensor.
Preferably, the control processing part determines the first and second predetermined time intervals and the first and second preset time nodes according to weather forecast information of a location of the movable carrier. For example, the local weather forecast information indicates that there is rainfall from 9 am to 6 pm on the day, and thus the first preset time node may be set to be a 9 am or advanced node (e.g., 8 am), and the first preset time node may be set to be a 6 pm or delayed node (e.g., 7 am) or delayed until no rainfall is detected. As another example, the weather forecast information indicates that there is rainfall from 9 am to 6 pm on the day and the current time is 7 am, so the first predetermined time interval is set to 2 hours (or appropriately measured in advance to be set to 1 hour for 30 minutes), and the second predetermined time interval is set to 9 hours (i.e., the interval from 9 am to 6 pm, or appropriately extended). Referring to fig. 3, the weather forecast information may come from a cloud server or a user terminal. Therefore, the invention can enter the measuring state section when necessary, thereby more accurately and effectively saving resources and achieving the aims of accurately reducing power consumption and prolonging the service life of the sensor on the premise of ensuring the detection effect.
In one embodiment of the invention, the sensing surface of the sensing pick-up is arranged obliquely with respect to the travelling direction of the movable carrier. Thereby being capable of ensuring sufficient contact with raindrops to improve detection accuracy.
In one embodiment of the invention, the sensing surface of the sensing collection part comprises a cambered surface, so that the raindrop impact in the transverse direction and the longitudinal direction is received conveniently, and the detection accuracy is improved.
Referring to fig. 3, the present invention also provides an unmanned vehicle having the rainfall detection device as described above. Further, since the present invention employs the contact-type sensing element, it is possible for the unmanned vehicle not to be provided with the wiper device at the installation position of the rainfall amount detection device.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (16)
1. A rainfall detection device for a movable carrier is characterized by comprising a sensing acquisition part and a control processing part;
the sensor acquisition part comprises a contact type sensing element and acquires rainfall sensing signals through the contact type sensing element; and the control processing part receives the rainfall sensing signal and processes the rainfall sensing signal to obtain rainfall information.
2. A rainfall detection device as claimed in claim 1 wherein the touch sensitive element is a force sensitive element.
3. The rainfall detection device of claim 2, wherein the rainfall sensing signals comprise a pressure amplitude signal and a vibration frequency signal.
4. A rainfall detection device as claimed in claim 3 wherein the pressure amplitude signal is a time domain distribution of peak to trough differences of single rain strike pressure.
5. The rainfall detection device according to claim 1, further comprising an information communication unit for transmitting the rainfall information to an external apparatus;
the external device includes: other devices of the mobile carrier, a cloud server and/or a user terminal.
6. The rainfall detection device according to claim 5, wherein the information communication unit transmits the rainfall information to the external apparatus based on CAN and/or Lin protocols.
7. The rainfall detection device of any one of claims 1 to 6 wherein said rainfall detection device is capable of continuing to collect said rainfall sensing signals after said movable carrier is completely shut down.
8. The rainfall detection device of claim 7, wherein after the movable carrier is shut down, the rainfall detection device has a measurement status section in which the rainfall sensing signal can be collected and a measurement stop status section in which the rainfall sensing signal is stopped.
9. The rainfall detection device of claim 8 wherein after said movable carrier is completely shut down, said rainfall detection device transitions to said measuring state segment after a first predetermined time interval has elapsed; or, the measurement state section is switched to after the first preset time node is reached.
10. A rainfall detection device of claim 9, wherein the control processing portion determines the first predetermined time interval and the first preset time node based on weather forecast information of a location of the movable carrier.
11. The rainfall detection device of claim 8 wherein after said movable carrier is completely shut down, said rainfall detection device transitions to said stop measuring state segment after a second predetermined time interval has elapsed; or, after reaching a second preset time node, switching to the measurement stopping state segment.
12. A rainfall detection device of claim 11, wherein the control processing portion determines the second predetermined time interval and the second preset time node based on weather forecast information of a location of the movable carrier.
13. A rainfall detection device according to any one of claims 1 to 6 wherein the sensing surface of the sensing pick-up is arranged obliquely to the direction of travel of the movable carrier.
14. A rainfall detection device as claimed in any one of claims 1 to 6 wherein the sensing surface of the sensing acquisition portion comprises a curved surface.
15. An unmanned vehicle having a rainfall detection device, characterized in that: the rainfall detection device is according to any one of claims 1 to 14.
16. The unmanned vehicle of claim 15, wherein: the unmanned vehicle is not provided with a wiper device at the installation position of the rainfall detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911114736.0A CN110989045A (en) | 2019-11-14 | 2019-11-14 | Rainfall detection device for movable carrier and unmanned vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911114736.0A CN110989045A (en) | 2019-11-14 | 2019-11-14 | Rainfall detection device for movable carrier and unmanned vehicle |
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| CN110989045A true CN110989045A (en) | 2020-04-10 |
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| CN201911114736.0A Pending CN110989045A (en) | 2019-11-14 | 2019-11-14 | Rainfall detection device for movable carrier and unmanned vehicle |
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| CN206178173U (en) * | 2016-11-15 | 2017-05-17 | 湖北文理学院 | Pressure type car rainfall sensing device |
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2019
- 2019-11-14 CN CN201911114736.0A patent/CN110989045A/en active Pending
Patent Citations (5)
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| CN102221715A (en) * | 2010-04-16 | 2011-10-19 | 哈尔滨工业大学 | Rainfall sensor detection platform based on LIN (Local Interconnect Network) bus and detection method thereof |
| US20150161830A1 (en) * | 2013-12-11 | 2015-06-11 | Robert Bosch Gmbh | Device for monitoring a sensor of a vehicle |
| CN103926636A (en) * | 2014-03-31 | 2014-07-16 | 卢会国 | Rainfall data processing system based on piezoelectricity acceleration sensor |
| CN106004380A (en) * | 2016-06-28 | 2016-10-12 | 科世达（上海）管理有限公司 | Skylight control system |
| CN206178173U (en) * | 2016-11-15 | 2017-05-17 | 湖北文理学院 | Pressure type car rainfall sensing device |
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