CN101458830B - Intelligent electric power management implementation device for vehicle-mounted unit of non-stop toll collecting system - Google Patents
Intelligent electric power management implementation device for vehicle-mounted unit of non-stop toll collecting system Download PDFInfo
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- CN101458830B CN101458830B CN2008101950928A CN200810195092A CN101458830B CN 101458830 B CN101458830 B CN 101458830B CN 2008101950928 A CN2008101950928 A CN 2008101950928A CN 200810195092 A CN200810195092 A CN 200810195092A CN 101458830 B CN101458830 B CN 101458830B
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Abstract
The invention relates to a no stop electronic toll collection system on-vehicle unit intelligent power manager, comprising an awake signal amplifying circuit, a power management module microcontroller and a DC/DC circuit module, wherein the input of the awake signal amplifying circuit is used as the input of the no stop electronic toll collection system on-vehicle unit intelligent power management device, whose output is connected with the input of the power management module microcontroller for transmitting awake interrupt request signals to the power management module microcontroller, thereby activating the power management module microcontroller from sleep stage, the activated power management module microcontroller generates a DC/DC enable signal which is input to the DC/DC circuit module via the output of the power management module microcontroller, the output of the DC/DC circuit module is used as the output of the no stop electronic toll collection system on-vehicle unit intelligent power management device. The no stop electronic toll collection system on-vehicle unit intelligent power manager can reduce the power consumption of OBU and improve the utilization rate of battery.
Description
Technical field
The invention belongs to a kind of intelligent electric power management implement device of power management the realization technology, particularly a kind of toll collection system vehicle-mount unit of equipment in the intelligent transportation electronic charging field.
Background technology
(Electronic Toll Collection ETC) is special application in the intelligent transportation system field to E-payment system.The ETC system utilizes the equipment of new and high technologies such as microwave technology, electronic technology, computer technology, communication and network technology, infotech, sensing technology, image recognition technique and the AS that software (comprising management) is formed, and both can collect the road expense automatically to realize the vehicle dispense with parking.
At present, no-stop charging system (ETC) is designed to by roadside read-write equipment (Road Side Unit, abbreviation RSU), board units (On Board Unit, abbreviation OBU), IC-card (Integrated Circuit, integrated circuit card), several most of compositions such as computer security keyholed back plate technology, signal transmitting and receiving device (RSU) by roadside lane equipment control system, specific coding in the equipment OBU on the identification vehicle, differentiate vehicle, calculating toll usefulness, and from the specified account of vehicle user, deduct toll automatically.
Existing OBU power supply mode generally has two kinds, and one is to use the direct supply interface power supply of automobile, and the 2nd, utilize the not reproducible lithium electricity that fills-sulphurous acid chlorine powered battery.Preceding a kind of method can provide very sufficient electric energy, but the direct supply interface of different automobiles does not have unified standard, and this consumer brings very big inconvenience.Second kind of method of supplying power to makes OBU break away from dependence to automobile power source fully, but also has great number of issues:
1 battery utilization factor is not high: the consumption of back along with battery capacity works long hours, cell voltage reduces, even can be lower than the minimum of some device, yet this moment, battery still existed a large amount of electric energy to be not used, and directly caused the utilization factor of battery to reduce.
2 carrying load abilities are poor: for the very big load of electric current, and IC-card module for reading and writing for example, after DSRC (Dedicated Short Range Communications) chip etc. was started working, the cell voltage amplitude of oscillation was bigger, can not guarantee constant voltage output, even caused the certain module can't operate as normal.
3 quiescent currents are excessive: the OBU overwhelming majority time is in sleep pattern in the whole life of OBU, quiescent dissipation between sleep period is very big, the battery waste is serious, and the direct result that causes is exactly the replacing battery that does not stop, and has also shortened the serviceable life of product simultaneously.
These shortcomings have been brought inconvenience to the consumer, have directly had influence on the matter of utmost importance of product competitiveness.After all, the defective of prior art is exactly that the power consumption of OBU is too big.
Summary of the invention
The object of the present invention is to provide a kind of power consumption that can greatly reduce OBU, improve the toll collection system vehicle-mount unit intelligent electric power management implement device of the utilization factor of battery.
The technical solution that realizes the object of the invention is: a kind of toll collection system vehicle-mount unit intelligent electric power management implement device comprises wake-up signal amplifying circuit, power management module microcontroller (Micro Controller Unit is called for short MCU), DC/DC circuit module; The input end of wake-up signal amplifying circuit is the input end of this toll collection system vehicle-mount unit intelligent electric power management implement device, this input end receives the output signal of microwave detection module and with its amplification, the input end of the output termination power management module MCU of wake-up signal amplifying circuit, the wake-up interrupts request signal is transferred to power management module MCU, thereby MCU activates from sleep state with power management module, the power management module MCU that activates produces a DC/DC enable signal at once, this enable signal inputs to the DC/DC circuit module by the output terminal of power management module MCU, thereby the DC/DC circuit module is started working, at this moment to begin the supply voltage of stable output 3.3V be follow-up module for power supply to the output terminal of DC/DC circuit module, and the output terminal of DC/DC circuit module is the output terminal of this toll collection system vehicle-mount unit intelligent electric power management implement device; Wake-up signal amplifying circuit, power management module MCU and DC/DC circuit module are by the battery continued power.
The present invention compared with prior art, its remarkable advantage is the power consumption that has reduced OBU, greatly improves the utilization factor of battery.Because toll collection system vehicle-mount unit intelligent electric power management module of the present invention will be controlled OBU and be operated in sleep pattern and two kinds of patterns of enable mode, when promptly charging OBU is waken up, allow it enter sleep state after transaction is finished, thereby the power consumption of OBU is reduced to minimum at once.
Description of drawings
Fig. 1 is a toll collection system vehicle-mount unit intelligent power source management method structural drawing of the present invention.
Fig. 2 is toll collection system vehicle-mount unit intelligent electric power management apparatus module figure of the present invention.
Fig. 3 is a toll collection system vehicle-mount unit intelligent electric power management circuit diagram of the present invention.
Fig. 4 is a toll collection system vehicle-mount unit intelligent electric power management program flow diagram of the present invention.
Embodiment
In the whole process that automobile travels on highway, be very short through time of charge station, OBU only need work during through charge station at automobile, and the working time less than a second, other overwhelming majority times do not need work.The designed intelligent electric power management module of the present invention will be controlled OBU and be operated in two kinds of patterns, sleep pattern and enable mode, and as shown in Figure 1, when car entered charge station, OBU was activated, and started working, and was in enable mode; Finish when transaction, after car left charge station, OBU quit work at once and enters sleep pattern.
Toll collection system vehicle-mount unit intelligent electric power management apparatus module figure of the present invention as shown in Figure 2, this device comprises wake-up signal amplifying circuit U2, power management module microcontroller U3, DC/DC circuit module U4; The input end DATAIN of wake-up signal amplifying circuit U2 is the input end of this toll collection system vehicle-mount unit intelligent electric power management implement device, this input end receives the output signal of microwave detection module U1 and with its amplification, the input end of the output termination power management module microcontroller U3 of wake-up signal amplifying circuit U2, the wake-up interrupts request signal is transferred to power management module microcontroller U3, thereby the power management module microcontroller is activated from sleep state, the power management module microcontroller that activates produces a DC/DC enable signal at once, this enable signal inputs to DC/DC circuit module U4 by the output terminal of power management module microcontroller U3, thereby DC/DC circuit module U4 is started working, at this moment to begin the supply voltage of stable output 3.3V be follow-up module for power supply to the output terminal of DC/DC circuit module U4, and the output terminal VOUT of DC/DC circuit module U4 is the output terminal of this toll collection system vehicle-mount unit intelligent electric power management implement device; Wake-up signal amplifying circuit U2, power management module microcontroller U3 and DC/DC circuit module U4 are by battery U9 continued power.
When car process charge station, antenna receives the square-wave signal that wakes up that is mail to OBU by RSU, can produce a wake-up interrupts request signal behind this signal process microwave detection module U1 and the wake-up signal amplifying circuit U2 and trigger power management module microcontroller U3 interruption, the power management module microcontroller is activated from sleep state, the power management module microcontroller that activates produces a DC/DC enable signal at once, this signal is started working DC/DC circuit module U4, and the VOUT that is exported by the DC/DC circuit module gives modulation module U5 again, account management module U6, IC-card module for reading and writing U7, human-machine interface module U8 power supply.The selection of DC/DC circuit module not only will consider to satisfy the requirement and the reliability of circuit performance, also will consider its problems such as volume, weight, extending battery life and cost.Native system needs the supply voltage of 3.3V, thereby uses fixing output to get final product, and the device of employing is the TPS79633 chip of TI company.After transaction was finished, the power management module microcontroller entered sleep pattern by software control at once, and the DC/DC circuit module quits work, and stopped to other module for power supply, and system enters low power consumpting state again.
Toll collection system vehicle-mount unit intelligent electric power management circuit diagram of the present invention as shown in Figure 3, among the wake-up signal amplifying circuit U2, one end of first capacitor C 1 is the input end DATAIN of wake-up signal amplifying circuit U2, the other end of first capacitor C 1 connects first resistance R 1, first capacitor C 1 is the coupling capacitance of input end DATAIN, the other end of first resistance R 1 connects the pin 1IN-of the 4th resistance R 4 and a TLV2382 chip A1, the other end of the 4th resistance R 4 connects the pin 1OUT of the 3rd capacitor C 3 and a TLV2382 chip A1, the other end of the 3rd capacitor C 3 connects the 5th resistance R 5, the other end of the 5th resistance R 5 connects the pin 2IN-of the 8th resistance R 8 and a TLV2382 chip A1, the other end of the 8th resistance R 8 connects the pin 2OUT of the 4th capacitor C 4 and a TLV2382 chip A1, the 4th resistance R 4 and 8 negative feedback of the 8th resistance R, they control the gains of TLV2382 chip A1 respectively jointly with first resistance R 1 and the 5th resistance R 5, the output terminal Vcc of battery U9 connects second capacitor C 2, second resistance R 2, the pin VDD of the 6th resistance R 6 and a TLV2382 chip A1, the other end ground connection of second capacitor C 2, second capacitor C 2 is the power supply coupling capacitor of battery U9 output terminal Vcc, the other end of second resistance R 2 connects the 3rd resistance R 3, the other end ground connection of the 3rd resistance R 3, second resistance R 2 and the centre tap place of the 3rd resistance R 3 also are connected the pin 1IN+ of a TLV2382 chip A1, for the pin 1IN+ of a TLV2382 chip A1 provides the biasing input voltage, the other end of the 6th resistance R 6 connects the 7th resistance R 7, the other end ground connection of the 7th resistance R 7, the 6th resistance R 6 and the centre tap place of the 7th resistance R 7 also are connected the pin 2IN+ of a TLV2382 chip A1, for the pin 2IN+ of a TLV2382 chip A1 provides the biasing input voltage, the pin GND ground connection of a TLV2382 chip A1; The other end of the 4th capacitor C 4 connects the 9th resistance R 9, the 4th capacitor C 4 plays the signal coupling capacitance, the other end of the 9th resistance R 9 connects the pin 1IN-of the 12 resistance R 12 and the 2nd TLV2382 chip A2, the other end of the 12 resistance R 12 connects the pin 1OUT of the 6th capacitor C 6 and the 2nd TLV2382 chip A2, the other end of the 6th capacitor C 6 connects the 13 resistance R 13, the other end of the 13 resistance R 13 connects the pin 2IN-of the 16 resistance R 16 and the 2nd TLV2382 chip A2, the other end of the 16 resistance R 16 connects the pin 2OUT of the 2nd TLV2382 chip A2, the 12 resistance R 12 and 16 negative feedback of the 16 resistance R, they control the gains of the 2nd TLV2382 chip A2 respectively jointly with the 9th resistance R 9 and the 13 resistance R 13, simultaneously, the other end of the 16 resistance R 16 is the output terminal of wake-up signal amplifying circuit U2, the output terminal Vcc of battery U9 connects the 5th capacitor C 5, the tenth resistance R 10, the pin VDD of the 14 resistance R 14 and the 2nd TLV2382 chip A2, the other end ground connection of the 5th capacitor C 5, the 5th capacitor C 5 is the power supply coupling capacitor of battery U9 output terminal Vcc, the other end of the tenth resistance R 10 connects the 11 resistance R 11, the other end ground connection of the 11 resistance R 11, the tenth resistance R 10 and the centre tap place of the 11 resistance R 11 also are connected the pin 1IN+ of the 2nd TLV2382 chip A2, for the pin 1IN+ of the 2nd TLV2382 chip A2 provides the biasing input voltage, the other end of the 14 resistance R 14 connects the 15 resistance R 15, the other end ground connection of the 15 resistance R 15, the 14 resistance R 14 and the centre tap place of the 15 resistance R 15 also are connected the pin 2IN+ of a TLV2382 chip A1, for the pin 2IN+ of the 2nd TLV2382 chip A2 provides the biasing input voltage, the pin GND ground connection of the 2nd TLV2382 chip A2.
Among the power management module microcontroller U3, the pin P1.0 of MSP430F2001 chip A3 is the input end of power management module microcontroller U3, and the pin P1.1 of MSP430F2001 chip A3 is the output terminal of power management module microcontroller U3; Connect crystal oscillator Y1 between the pin P2.6 of MSP430F2001 chip A3 and the pin P2.7, crystal oscillator Y1 provides major clock for MSP430F2001 chip A3, the pin P2.6 of MSP430F2001 chip A3 also connects the 9th capacitor C 9, the other end ground connection of the 9th capacitor C 9, the pin P2.7 of MSP430F2001 chip A3 also connects the other end ground connection of the tenth capacitor C 10, the ten capacitor C 10; The pin VSS ground connection of MSP430F2001 chip A3, the pin RST ground connection of MSP430F2001 chip A3, between the pin RST of MSP430F2001 chip A3 and ground, be connected switch S 1, during switch S 1 closure, MSP430F2001 chip A3 begins to carry out MCU interruption setting, port is provided with initialization operation; The output terminal Vcc of battery U9 connects the pin VCC of MSP430F2001 chip A3, and the pin VCC of MSP430F2001 chip A3 also connects the other end ground connection of the 7th capacitor C 7, the seven capacitor C 7, and the 8th capacitor C 8 is in parallel with the 7th capacitor C 7.
Among the DC/DC circuit module U4, the pin EN of TPS79633 chip A4 connects the 17 resistance R 17, the other end of the 17 resistance R 17 is the input end of DC/DC circuit module U4, the output terminal Vcc of battery U9 connects the pin IN of TPS79633 chip A4, the pin IN of TPS79633 chip A4 also connects the 11 capacitor C 11, the other end ground connection of the 11 capacitor C 11, the 12 capacitor C 12 and the 13 capacitor C 13 are in parallel with the 11 capacitor C 11 respectively, the pin GND ground connection of TPS79633 chip A4, the pin NR/FB of TPS79633 chip A4 is connected with the 14 capacitor C 14, the other end ground connection of the 14 capacitor C 14, the pin OUT of TPS79633 chip A4 is connected with the 15 capacitor C 15, the other end ground connection of the 15 capacitor C 15, the pin OUT of TPS79633 chip A4 is the output terminal of DC/DC circuit module U4.
Toll collection system vehicle-mount unit intelligent electric power management program flow diagram of the present invention as shown in Figure 4, the management of power management module MCU comprises following steps:
Step 1: carry out that MCU interrupt to be provided with, port is provided with initialization operation;
Step 2: MCU closes major clock, thereby system enters the low-power consumption standby pattern;
Step 3: interrupt entering so step 4 if MCU receives the wake-up signal request, otherwise keep closing the major clock state;
Step 4: MCU opens major clock;
Step 5: MCU exports high level, thereby the DC/DC circuit module is started working;
Step 6: MCU opening timing device;
Step 7: if regularly finish, then enter step 8, otherwise continue to wait for;
Step 8: the MCU output low level, enter step 2 simultaneously, make MCU close major clock, thereby the DC/DC circuit module quit work.
Claims (2)
1. toll collection system vehicle-mount unit intelligent electric power management implement device, it is characterized in that: this device comprises wake-up signal amplifying circuit (U2), power management module MCU (U3), DC/DC circuit module (U4); The input end (DATAIN) of wake-up signal amplifying circuit (U2) is the input end of this toll collection system vehicle-mount unit intelligent electric power management implement device, this input end receives the output signal of microwave detection module (U1) and with its amplification, the input end of the output termination power management module MCU (U3) of wake-up signal amplifying circuit (U2), the wake-up interrupts request signal is transferred to power management module MCU (U3), thereby MCU activates from sleep state with power management module, the power management module MCU that activates produces a DC/DC enable signal at once, this enable signal inputs to DC/DC circuit module (U4) by the output terminal of power management module MCU (U3), thereby DC/DC circuit module (U4) is started working, at this moment to begin stable output supply voltage be follow-up module for power supply to the output terminal of DC/DC circuit module (U4), and the output terminal (VOUT) of DC/DC circuit module (U4) is the output terminal of this toll collection system vehicle-mount unit intelligent electric power management implement device; Wake-up signal amplifying circuit (U2), power management module MCU (U3) and DC/DC circuit module (U4) are by battery (U9) continued power;
In the wake-up signal amplifying circuit (U2), one end of first electric capacity (C1) is the input end (DATAIN) of wake-up signal amplifying circuit (U2), the other end of first electric capacity (C1) connects first resistance (R1), first electric capacity (C1) is the coupling capacitance of input end (DATAIN), the other end of first resistance (R1) connects the pin 1IN-of the 4th resistance (R4) and a TLV2382 chip (A1), the other end of the 4th resistance (R4) connects the pin 1OUT of the 3rd electric capacity (C3) and a TLV2382 chip (A1), the other end of the 3rd electric capacity (C3) connects the 5th resistance (R5), the other end of the 5th resistance (R5) connects the pin 2IN-of the 8th resistance (R8) and a TLV2382 chip (A1), the other end of the 8th resistance (R8) connects the pin 2OUT of the 4th electric capacity (C4) and a TLV2382 chip (A1), the 4th resistance (R4) and the 8th resistance (R8) play negative feedback, they control the gain of a TLV2382 chip (A1) respectively jointly with first resistance (R1) and the 5th resistance (R5), the output terminal (Vcc) of battery (U9) connects second electric capacity (C2), second resistance (R2), the pin VDD of the 6th resistance (R6) and a TLV2382 chip (A1), the other end ground connection of second electric capacity (C2), second electric capacity (C2) is the power supply coupling capacitor of battery (U9) output terminal (Vcc), the other end of second resistance (R2) connects the 3rd resistance (R3), the other end ground connection of the 3rd resistance (R3), second resistance (R2) and the centre tap place of the 3rd resistance (R3) also are connected the pin 1IN+ of a TLV2382 chip (A1), the pin 1IN+ that is a TLV2382 chip (A1) provides the biasing input voltage, the other end of the 6th resistance (R6) connects the 7th resistance (R7), the other end ground connection of the 7th resistance (R7), the 6th resistance (R6) and the centre tap place of the 7th resistance (R7) also are connected the pin 2IN+ of a TLV2382 chip (A1), the pin 2IN+ that is a TLV2382 chip (A1) provides the biasing input voltage, the pin GND ground connection of a TLV2382 chip (A1);
The other end of the 4th electric capacity (C4) connects the 9th resistance (R9), the 4th electric capacity (C4) plays the signal coupling capacitance, the other end of the 9th resistance (R9) connects the pin 1IN-of the 12 resistance (R12) and the 2nd TLV2382 chip (A2), the other end of the 12 resistance (R12) connects the pin 1OUT of the 6th electric capacity (C6) and the 2nd TLV2382 chip (A2), the other end of the 6th electric capacity (C6) connects the 13 resistance (R13), the other end of the 13 resistance (R13) connects the pin 2IN-of the 16 resistance (R16) and the 2nd TLV2382 chip (A2), the other end of the 16 resistance (R16) connects the pin 2OUT of the 2nd TLV2382 chip (A2), the 12 resistance (R12) and the 16 resistance (R16) play negative feedback, they control the gain of the 2nd TLV2382 chip (A2) respectively jointly with the 9th resistance (R9) and the 13 resistance (R13), simultaneously, the other end of the 16 resistance (R16) is the output terminal of wake-up signal amplifying circuit (U2), the output terminal (Vcc) of battery (U9) connects the 5th electric capacity (C5), the tenth resistance (R10), the pin VDD of the 14 resistance (R14) and the 2nd TLV2382 chip (A2), the other end ground connection of the 5th electric capacity (C5), the 5th electric capacity (C5) is the power supply coupling capacitor of battery (U9) output terminal (Vcc), the other end of the tenth resistance (R10) connects the 11 resistance (R11), the other end ground connection of the 11 resistance (R11), the tenth resistance (R10) and the centre tap place of the 11 resistance (R11) also are connected the pin 1IN+ of the 2nd TLV2382 chip (A2), the pin 1IN+ that is the 2nd TLV2382 chip (A2) provides the biasing input voltage, the other end of the 14 resistance (R14) connects the 15 resistance (R15), the other end ground connection of the 15 resistance (R15), the 14 resistance (R14) and the centre tap place of the 15 resistance (R15) also are connected the pin 2IN+ of a TLV2382 chip (A1), the pin 2IN+ that is the 2nd TLV2382 chip (A2) provides the biasing input voltage, the pin GND ground connection of the 2nd TLV2382 chip (A2);
Among the power management module MCU (U3), the pin P1.0 of MSP430F2001 chip (A3) is the input end of power management module MCU (U3), and the pin P1.1 of MSP430F2001 chip (A3) is the output terminal of power management module MCU (U3); Connect crystal oscillator (Y1) between the pin P2.6 of MSP430F2001 chip (A3) and the pin P2.7, crystal oscillator (Y1) provide major clock for MSP430F2001 chip (A3), the pin P2.6 of MSP430F2001 chip (A3) also connects the 9th electric capacity (C9), the other end ground connection of the 9th electric capacity (C9), the pin P2.7 of MSP430F2001 chip (A3) also connects the tenth electric capacity (C10), the other end ground connection of the tenth electric capacity (C10); The pin VSS ground connection of MSP430F2001 chip (A3), the pin RST ground connection of MSP430F2001 chip (A3), between the pin RST of MSP430F2001 chip (A3) and ground, be connected switch (S1), when switch (S1) was closed, MSP430F2001 chip (A3) began to carry out MCU interruption setting, port is provided with initialization operation; The output terminal (Vcc) of battery (U9) connects the pin VCC of MSP430F2001 chip (A3), the pin VCC of MSP430F2001 chip (A3) also connects the 7th electric capacity (C7), the other end ground connection of the 7th electric capacity (C7), the 8th electric capacity (C8) is in parallel with the 7th electric capacity (C7);
In the DC/DC circuit module (U4), the pin EN of TPS79633 chip (A4) connects the 17 resistance (R17), the other end of the 17 resistance (R17) is the input end of DC/DC circuit module (U4), the output terminal (Vcc) of battery (U9) connects the pin IN of TPS79633 chip (A4), the pin IN of TPS79633 chip (A4) also connects the 11 electric capacity (C11), the other end ground connection of the 11 electric capacity (C11), the 12 electric capacity (C12) and the 13 electric capacity (C13) are in parallel with the 11 electric capacity (C11) respectively, the pin GND ground connection of TPS79633 chip (A4), the pin NR/FB of TPS79633 chip (A4) is connected with the 14 electric capacity (C14), the other end ground connection of the 14 electric capacity (C14), the pin OUT of TPS79633 chip (A4) is connected with the 15 electric capacity (C15), the other end ground connection of the 15 electric capacity (C15), the pin OUT of TPS79633 chip (A4) is the output terminal of DC/DC circuit module (U4).
2. toll collection system vehicle-mount unit intelligent electric power management implement device as claimed in claim 1 is characterized in that the management process of power management module MCU is:
Step 1: carry out that MCU interrupt to be provided with, port is provided with initialization operation;
Step 2: MCU closes major clock, thereby system enters the low-power consumption standby pattern;
Step 3: interrupt entering so step 4 if MCU receives the wake-up signal request, otherwise keep closing the major clock state;
Step 4: MCU opens major clock;
Step 5: MCU exports high level, thereby DC/DC circuit module (U4) is started working;
Step 6: MCU opening timing device;
Step 7: if regularly finish, then enter step 8, otherwise continue to wait for;
Step 8: the MCU output low level, enter step 2 simultaneously, make MCU close major clock, thereby DC/DC circuit module (U4) quit work.
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| CN2008101950928A CN101458830B (en) | 2008-11-05 | 2008-11-05 | Intelligent electric power management implementation device for vehicle-mounted unit of non-stop toll collecting system |
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| CN2008101950928A CN101458830B (en) | 2008-11-05 | 2008-11-05 | Intelligent electric power management implementation device for vehicle-mounted unit of non-stop toll collecting system |
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| CN102082587B (en) * | 2009-12-01 | 2015-05-20 | 中兴通讯股份有限公司 | Data communication method and system of vehicle-mounted unit |
| US8749198B2 (en) * | 2011-11-10 | 2014-06-10 | Lear Corporation | Control pilot detection circuit |
| CN103164877B (en) * | 2011-12-13 | 2015-07-08 | 北京北大千方科技有限公司 | Vehicle-mounted terminal and power management method of vehicle-mounted terminal |
| CN105682947B (en) * | 2013-09-25 | 2019-05-14 | 斯特有限公司 | The equipment and component detected for the tire parameter to through trip tool |
| CN103746441A (en) * | 2014-01-15 | 2014-04-23 | 成都华之芯科技有限公司 | Vehicle-mounted high-power microwave system with hybrid power supply |
| CN106875599A (en) * | 2017-04-11 | 2017-06-20 | 成都市宏山科技有限公司 | The warning device of artificial destruction can be prevented |
| CN107680181B (en) * | 2017-09-01 | 2020-04-07 | 深圳市金溢科技股份有限公司 | Multifunctional intelligent vehicle-mounted unit and control method thereof |
| CN109934943A (en) * | 2017-12-19 | 2019-06-25 | 北京聚利科技股份有限公司 | The method and apparatus for reducing OBU power consumption |
| CN111369700A (en) * | 2020-03-13 | 2020-07-03 | 长春众鼎科技有限公司 | ETC anti-theft terminal, system and method |
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