CN220755062U - OBU equipment capable of preventing false wake-up - Google Patents
OBU equipment capable of preventing false wake-up Download PDFInfo
- Publication number
- CN220755062U CN220755062U CN202322500375.1U CN202322500375U CN220755062U CN 220755062 U CN220755062 U CN 220755062U CN 202322500375 U CN202322500375 U CN 202322500375U CN 220755062 U CN220755062 U CN 220755062U
- Authority
- CN
- China
- Prior art keywords
- module
- internet
- things
- power
- rsu
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000010586 diagram Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 230000007958 sleep Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 241000497429 Obus Species 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000002618 waking effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The utility model discloses an OBU device for preventing false wake-up, comprising: the system comprises an Internet of things module, a positioning module, an ETC transceiver and a power module; the internet of things module is electrically connected with the positioning module and the ETC transceiver; the positioning module is provided with a geofence state indication pin, and the geofence state indication pin is electrically connected with the ETC transceiver; the power module is used for supplying power to the internet of things module, the positioning module and the ETC transceiver. According to the utility model, the ETC transceiver is awakened by two signals at the same time, so that the frequency of error awakening of the OBU equipment is effectively reduced, and the power consumption is reduced.
Description
Technical Field
The utility model relates to the technical field of OBU equipment, in particular to OBU equipment capable of preventing false wake-up.
Background
ETC system adopts OBU+RSU's scheme, installs OBU in the car, and OBU adopts battery power supply generally, and after the normal installation, OBU is in sleep mode, and the consumption is less this moment, when being in the sign station and in the toll station signal area, OBU is awakened, gets into operating mode to carry out data transceiver communication with RSU.
The traditional OBU equipment includes controller, security module, anti-disassembly detection, ETC module. The ETC module comprises an ETC transceiver module, a wake-up detection circuit and a signal conversion module; the controller comprises a controller wake-up module, and the controller wake-up module is used for waking up the controller in the sleep mode. The wake-up detection circuit is connected with the controller wake-up module, namely when the wake-up detection circuit detects the RSU broadcast signal, the signal is transmitted to the controller wake-up module to wake up the controller, and the ETC transaction flow is triggered.
In the conventional OBU scheme, the wake-up detection circuit needs to continuously detect the RSU broadcast signal, and at this time, although the power consumption of the wake-up detection circuit is low, the long-time accumulated power consumption is also objective due to the continuous power consumption. Meanwhile, most of traditional OBU is powered by a battery, and the wake-up circuit has limited signal discrimination capability, and can receive interference of non-ETC signals, so that false wake-up is caused, and extra electric energy loss is caused.
And before the OBU enters the RSU signal area, the ETC_OBU may be awakened in advance by the RSU antenna signal due to the influence of environmental factors, so that the RSU and the OBU are not matched in receiving and transmitting, and the problem of two opposite transmissions is caused, and unnecessary electric energy waste is caused. Meanwhile, due to the opposite transmission, channels are occupied, so that the communication of other OBUs is affected, and the communication success rate is reduced.
Disclosure of Invention
The utility model aims to provide OBU equipment capable of preventing false wake-up, so that the frequency of false wake-up of the OBU equipment can be effectively reduced, and the power consumption is reduced.
The embodiment of the utility model is realized by the following technical scheme:
an OBU device for preventing false wake up, comprising: the system comprises an Internet of things module, a positioning module, an ETC transceiver and a power module;
the power supply module is used for supplying power to the internet of things module, the positioning module and the ETC transceiver; the internet of things module is electrically connected with the positioning module and the ETC transceiver; the positioning module is provided with a geofence state indication pin, and the geofence state indication pin is electrically connected with the ETC transceiver; the power supply module is used for supplying power to the internet of things module, the positioning module and the ETC transceiver;
the system comprises a server, an Internet of things module, a positioning module and a positioning module, wherein the Internet of things module is used for acquiring information of a base station nearby an RSU and geographical coordinate information of an RSU transaction area from the server and transmitting the geographical coordinate information of the RSU transaction area to the positioning module; the internet of things module is further used for controlling the positioning module and the ETC transceiver to be conducted with the power supply module when the OBU is confirmed to be located at the RSU accessory base station;
the positioning module is used for providing geographic coordinates and a geographic fence indication, the positioning module is used for setting a geographic fence according to the information of the geographic coordinates of the RSU transaction area provided by the Internet of things module, and when the geographic coordinates are located in the geographic fence area set by the positioning module, the geographic fence state indication pin outputs effective signals to the ETC transceiver and the Internet of things module;
the ETC transceiver is used for receiving and transmitting ETC data and completing an ETC transaction flow; the ETC transceiver opens or closes a receiving function and ETC transaction flow according to the state of the geofence state indicating pin.
In an embodiment of the utility model, the positioning module is provided with a first power switch circuit, and the first power switch circuit is electrically connected with the internet of things module; when the internet of things module receives information of base stations nearby the RSU, the first power switch circuit is communicated with the power module and the positioning module.
In an embodiment of the utility model, the first power switch circuit includes a first MOS transistor and a second MOS transistor, and when the internet of things module receives information of a base station near the RSU, the internet of things module controls the first MOS transistor to be turned on, so that the second MOS transistor is turned on, and the power module supplies power to the positioning module.
In an embodiment of the present utility model, the ETC transceiver has a second power switching circuit, and the second power switching circuit is electrically connected to the internet of things module and the ACC signal of the vehicle, respectively; when the internet of things module receives information of base stations nearby the RSU and the second power switch circuit receives effective ACC signals, the second power switch circuit is communicated with the power module to the ETC transceiver.
In an embodiment of the utility model, the second power switching circuit includes a third MOS transistor, a fourth MOS transistor, and a fifth MOS transistor; after the internet of things module receives the RSU accessory base station information, the internet of things module controls the third MOS transistor to be conducted; when the ACC signal is effective, the fourth MOS tube is conducted; when the third MOS tube and the fourth MOS tube are conducted, the fifth MOS tube is conducted, so that the power supply module supplies power to the ETC transceiver.
In an embodiment of the utility model, the internet of things module is an NB-IOT module.
In an embodiment of the utility model, the positioning module is a GNSS module.
The technical scheme of the embodiment of the utility model has at least the following advantages and beneficial effects:
according to the OBU equipment for preventing false wake-up, when the signal is not received, only the module of the Internet of things is in a low-power consumption state; when the vehicle is stationary, the ACC signal is invalid, and the ETC transceiver is in a power-off state, so that the ETC signal cannot be awakened even if the ETC signal exists nearby; when the vehicle starts, the ACC signal is active, but the ETC transceiver does not receive an activation signal, the ETC is also in a powered-off state; when a vehicle runs, the internet of things module acquires the information of the base station nearby the RSU from the server, if the vehicle runs nearby the RSU, the internet of things module acquires the information of the base station and the information of the base station of the server, then acquires the geographical coordinate information of the transaction area of the RSU from the server, the internet of things module transmits the geographical coordinate information of the transaction area of the RSU to the positioning module, and meanwhile, the internet of things module receives the information of the base station nearby the RSU and the ETC transceiver receives a valid ACC signal, and the ETC transceiver is activated; when the vehicle enters the RSU transaction area, the geofence status pin of the positioning module sends a valid signal to the ETC transceiver to complete the ETC transaction flow. According to the utility model, the ETC transceiver is awakened by two signals at the same time, so that the frequency of error awakening of the OBU equipment is effectively reduced, and the power consumption is reduced.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic diagram of a first power switching circuit;
FIG. 3 is a schematic diagram of a second power switching circuit;
FIG. 4 is a schematic diagram of a transaction state according to the present utility model;
fig. 5 is a schematic structural diagram of an OBU device according to the prior art.
Icon: the system comprises a 1-Internet of things module, a 2-positioning module, a 3-ETC transceiver, a 4-power module, a 5-first power switch circuit and a 6-second power switch circuit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that the positional or positional relationship indicated by the terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying positive importance. Merely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Example 1:
referring to fig. 1-4, an OBU device for preventing false wake-up includes an internet of things module 1, a positioning module 2, an ETC transceiver 3 and a power module 4.
As shown in fig. 1, an internet of things module 1 is electrically connected with a positioning module 2 and an ETC transceiver 3; the positioning module 2 is provided with a geofence state indicating pin which is electrically connected with the ETC transceiver 3; the power module 4 is used for providing power for the internet of things module 1, the positioning module 2 and the ETC transceiver 3. In this embodiment, the power module 4 may be a vehicle-mounted power source or a battery, but because the power consumption of the internet of things module 1, the positioning module 2 and the ETC transceiver 3 is not very large, the power module 4 in this embodiment is preferably a lithium battery and an LDO voltage regulator, so as to meet the power consumption requirement.
The internet of things module 1 has the characteristics of wide coverage, low power consumption, low cost, easy deployment and the like, and in the embodiment, the internet of things module 1 is used for determining whether the current OBU equipment is in the coverage of the same base station as the RSU; the internet of things module 1 obtains information of base stations nearby the RSU and geographical coordinate information of the RSU transaction area from the server, transmits the geographical coordinate information of the RSU transaction area to the positioning module 2, and controls the positioning module 2 and the ETC transceiver 3 to be conducted with the power module 4 when the internet of things module 1 is used for confirming that the OBU is located in the RSU accessory base station.
The positioning module 2 is used for providing higher-precision position information, and because the internet of things module 1 can only determine the geographic information of the base station and can not determine the specific position information of the OBU equipment, the positioning module 2 is required to provide high-precision geographic coordinates; the positioning module 2 provides geographic coordinates and geographic fence indication, the positioning module 2 sets geographic fences according to the RSU transaction area geographic coordinate information provided by the Internet of things module 1, and when the geographic coordinates are located in the geographic fence area set by the positioning module 2, the positioning module 2 geographic fence state indication pins output effective signals to the ETC transceiver 3 and the Internet of things module 1;
the ETC transceiver 3 is used for receiving and transmitting ETC data and completing an ETC transaction flow; the ETC transceiver 3 turns on or off the receive function and the ETC transaction flow depending on the state of the geofence status indication pin.
Specifically, the positioning module 2 has a first power switch circuit 5, and the etc transceiver 3 has a second power switch circuit 6; the first power switch circuit 5 is electrically connected with the internet of things module 1, and the second power switch circuit 6 is electrically connected with the internet of things module 1 and ACC signals of the vehicle respectively; when the internet of things module 1 receives information of a base station nearby the RSU, the first power switch circuit 5 is turned on, so that the power module 4 supplies power to the positioning module 2; when the internet of things module 1 receives information of base stations nearby the RSU and the second power switch circuit 6 receives a valid ACC signal, the second power switch circuit 6 is turned on so that the power module 4 supplies power to the ETC transceiver 3.
In this embodiment, the internet of things module 1 has a CPU, so as to control the first power switch circuit 5 and the second power switch circuit 6.
In detail, the schematic structural diagram of the first power switch circuit 5 is shown in fig. 2, and includes a first MOS transistor Q22, a second MOS transistor Q21, and a plurality of resistors; when the internet of things module 1 receives information of a base station nearby the RSU, the internet of things module 1 outputs a high level, the first MOS tube Q22 is conducted, the second MOS tube Q21 is conducted, and therefore the power supply module 4 supplies power to the positioning module 2.
In detail, the schematic structural diagram of the second power switch circuit 6 is shown in fig. 3, and includes a third MOS transistor, a fourth MOS transistor, a fifth MOS transistor and a plurality of resistors; when the internet of things module 1 receives information of a base station nearby the RSU, the internet of things module 1 outputs a high level, the third MOS tube Q12 is conducted, and when the fourth MOS tube Q13 receives an ACC signal of the vehicle, the fifth MOS tube Q11 is conducted, so that the power supply module 4 supplies power to the ETC transceiver 3.
The ACC is a key door switch.
In this embodiment, the Internet of things module 1 is an NB-IOT module.
In this embodiment, the positioning module 2 is a GNSS module.
The working principle of this embodiment is as follows:
after the OBU equipment is installed, the OBU equipment is in a dormant state, at the moment, the second power switch circuit 6 is disconnected, the communication between the ETC transceiver 3 and the power module 4 is cut off, and meanwhile, the first positioning power switch circuit is disconnected, and the communication between the positioning module 2 and the power module 4 is cut off; at this time, only the internet of things module 1 is in a low-power-consumption working state.
When the vehicle is stationary, the ACC signal is inactive, the second power switching circuit 6 remains open, the ETC transceiver 3 is not activated, and the ETC signal does not wake up even if there is a nearby ETC signal.
When the vehicle is started, the ACC signal is valid, but the second power switch circuit 6 needs to simultaneously receive the ACC signal and the information of the base station near the RSU received by the internet of things module 1, and if the vehicle does not pass through the RSU transaction area, the ETC transceiver 3 is still in the sleep state.
When a vehicle runs, the internet of things module 1 acquires the nearest base station information near the RSU from the server, if the vehicle runs near the RSU, the internet of things module 1 acquires the base station information to be matched with the server base station information, then acquires the geographical coordinate information of the RSU transaction area from the server, the internet of things module 1 transmits the geographical coordinate information of the RSU transaction area to the positioning module, and enables the geofence function of the positioning module 2, so that the positioning module 2 is activated; meanwhile, when the internet of things module 1 receives information of base stations nearby the RSU and the second power switch circuit 6 receives a valid ACC signal, the ETC transceiver 3 is activated.
When the vehicle enters the RSU transaction area, the GEOFENCE state foot geoforce indication of the positioning module 2 is valid, so that the ETC transaction flow of the ETC transceiver 3 is triggered, the system enters a low power consumption state again after completing the ETC transaction flow, and waits for the GEOFENCE state foot geoforce to trigger again.
When the vehicle leaves the RSU transaction area, the GEOFENCE status foot GEOFENCE of the positioning module 2 indicates invalid, the ETC transceiver 3 sleeps, and the internet of things module 1 clears the GEOFENCE information of the positioning module 2 and waits for the GEOFENCE information to be set again.
Example 2:
this example is described on the basis of example 1.
In the embodiment, the model of the NB-IOT module is Guangzhong MC907-CN, and is provided with two paths of UARTs which are respectively connected with the GNSS module and the ETC transceiver 3; the multiple GPIO respectively control the GNSS power supply and the ETC power supply and receive the GEOFENCE signal.
In this embodiment, the ETC transceiver 3 adopts a skyje 6610 core with ultra-low power consumption ARM Cortex M0, and the SOC integrated chip conforming to the ETC standard can independently complete the ETC transaction flow, and is connected with the NB-IOT through the UART, and has 4 external wake-up sources, one path is connected with the geogene pin of the GNSS.
In this embodiment, the GNSS module employs a remote LC760Z, which includes a geoforce module, and after entering a set GEOFENCE area, the geoforce pin is at a high level, and after exiting the area, the pin is at a low level; the GEOFENCE pin is connected with a wake-up source pin of the SKY6610 and is used for triggering the SKY6610 to receive RSU data; the GEOFENCE pin is also coupled to the NB-IOT module for informing it whether to enter or exit the GEOFENCE.
Other portions of this embodiment are the same as those of embodiment 1 described above, and thus will not be described again.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (7)
1. An OBU device for preventing false wake-up, comprising: the system comprises an Internet of things module, a positioning module, an ETC transceiver and a power module; the internet of things module is electrically connected with the positioning module and the ETC transceiver; the positioning module is provided with a geofence state indication pin, and the geofence state indication pin is electrically connected with the ETC transceiver; the power supply module is used for supplying power to the internet of things module, the positioning module and the ETC transceiver;
the system comprises a server, an Internet of things module, a positioning module and a positioning module, wherein the Internet of things module is used for acquiring information of a base station nearby an RSU and geographical coordinate information of an RSU transaction area from the server and transmitting the geographical coordinate information of the RSU transaction area to the positioning module; the internet of things module is further used for controlling the positioning module and the ETC transceiver to be conducted with the power supply module when the OBU is confirmed to be located at the RSU accessory base station;
the positioning module is used for providing geographic coordinates and a geographic fence indication, the positioning module is used for setting a geographic fence according to the information of the geographic coordinates of the RSU transaction area provided by the Internet of things module, and when the geographic coordinates are located in the geographic fence area set by the positioning module, the geographic fence state indication pin outputs effective signals to the ETC transceiver and the Internet of things module;
the ETC transceiver is used for receiving and transmitting ETC data and completing an ETC transaction flow; the ETC transceiver opens or closes a receiving function and ETC transaction flow according to the state of the geofence state indicating pin.
2. The OBU apparatus for preventing false wake-up according to claim 1, wherein the positioning module has a first power switch circuit, and the first power switch circuit is electrically connected to the internet of things module; when the internet of things module receives information of base stations nearby the RSU, the first power switch circuit is communicated with the power module and the positioning module.
3. The OBU apparatus for preventing false wake-up of claim 2, wherein the first power switch circuit includes a first MOS transistor and a second MOS transistor, and when the internet of things module receives information of a base station near the RSU, the internet of things module controls the first MOS transistor to be turned on, resulting in the second MOS transistor to be turned on, so that the power module supplies power to the positioning module.
4. The OBU device for preventing false wake-up according to claim 1, wherein the ETC transceiver has a second power switch circuit, and the second power switch circuit is electrically connected to the internet of things module and ACC signals of the vehicle, respectively; when the internet of things module receives information of a base nearby the RSU and the second power switch circuit receives an effective ACC signal, the second power switch circuit is communicated with the power module to the ETC transceiver.
5. The OBU apparatus for preventing false wake-up of claim 4, wherein said second power switching circuit comprises a third MOS transistor, a fourth MOS transistor, and a fifth MOS transistor; after the internet of things module receives the RSU accessory base station information, the internet of things module controls the third MOS transistor to be conducted; when the ACC signal is effective, the fourth MOS tube is conducted; when the third MOS tube and the fourth MOS tube are conducted, the fifth MOS tube is conducted, so that the power supply module supplies power to the ETC transceiver.
6. The OBU device for preventing false wake-up of claim 1, wherein the internet of things module is an NB-IOT module.
7. The OBU apparatus of claim 1, wherein said positioning module is a GNSS module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322500375.1U CN220755062U (en) | 2023-09-14 | 2023-09-14 | OBU equipment capable of preventing false wake-up |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322500375.1U CN220755062U (en) | 2023-09-14 | 2023-09-14 | OBU equipment capable of preventing false wake-up |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220755062U true CN220755062U (en) | 2024-04-09 |
Family
ID=90570340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322500375.1U Active CN220755062U (en) | 2023-09-14 | 2023-09-14 | OBU equipment capable of preventing false wake-up |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220755062U (en) |
-
2023
- 2023-09-14 CN CN202322500375.1U patent/CN220755062U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102082587B (en) | Data communication method and system of vehicle-mounted unit | |
| US11562704B2 (en) | Electronic tag and operation method thereof | |
| CN207457751U (en) | A kind of wireless human-computer interactive positioning terminal | |
| CN106289427A (en) | Wireless intelligent water meter and management platform thereof | |
| CN103105617A (en) | Ankle tracking system based on global position system (GPS)/ Beidou navigation satellite system | |
| CN213024494U (en) | Intelligent parking system based on NB-Iot | |
| US20210162821A1 (en) | Optimisation of wireless communications of a tyre-pressure-monitoring system for a motor vehicle | |
| KR20100118459A (en) | Improved bus information system | |
| CN207460515U (en) | A kind of portable secured tourist device | |
| CN116390020A (en) | Asset positioning and tracking device, asset positioning and tracking system and asset positioning and tracking method | |
| CN220755062U (en) | OBU equipment capable of preventing false wake-up | |
| CN104219741A (en) | Method for monitoring a vehicle for 90 days by using the own battery of a vehicle terminal | |
| CN101916472A (en) | Balance reminding device | |
| CN219802590U (en) | UWB positioning card | |
| CN114339594A (en) | Method and device for realizing indoor and outdoor ultra-low power consumption high-precision positioning based on Bluetooth module | |
| CN113376667A (en) | Beidou monitoring terminal and monitoring method | |
| CN202486315U (en) | Remote-monitoring tracking device for electric vehicle | |
| CN204740687U (en) | Door magnetism alarm devices , door magnetism warning door and door magnetism warning window | |
| CN107895184B (en) | NB-IoT based reader and method for judging and positioning in and out of school thereof | |
| CN212727480U (en) | Intelligent gateway control device for street lamp | |
| CN207965159U (en) | Positioning device and positioning system with the positioning device | |
| CN113329484A (en) | Vehicle-mounted terminal capable of switching communication modules | |
| CN205736689U (en) | Tire pressure detecting device | |
| CN110969894A (en) | Geomagnetic monitoring device and geomagnetic monitoring system based on LoRa technology | |
| CN108891299A (en) | charging pile system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Jia Chaoqiang Inventor after: Wu Guoqing Inventor after: Zeng Faping Inventor before: Jia Chaoqiang Inventor before: Wu Guoqing Inventor before: Zeng Faping |
|
| CB03 | Change of inventor or designer information |