CN107187419B - Automobile door lock state identification device and identification method - Google Patents
Automobile door lock state identification device and identification method Download PDFInfo
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- CN107187419B CN107187419B CN201710351101.7A CN201710351101A CN107187419B CN 107187419 B CN107187419 B CN 107187419B CN 201710351101 A CN201710351101 A CN 201710351101A CN 107187419 B CN107187419 B CN 107187419B
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- door lock
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- automobile
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- waveforms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
- B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
- B60R25/102—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device a signal being sent to a remote location, e.g. a radio signal being transmitted to a police station, a security company or the owner
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
- B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
Abstract
The invention provides an automobile door lock state identification device and an identification method. The single-chip microcomputer control circuit is connected with the voltage waveform detection circuit, the GPRS communication circuit and the voice playing circuit, the input end of the voltage waveform detection circuit is connected with two ends of an automobile power supply through an automobile OBD interface, the falling waveform of the automobile power supply voltage is detected, the single-chip microcomputer control circuit receives the detected falling waveform of the power supply voltage through the voltage waveform detection circuit, the automobile door lock is judged to be in an open state or a closed state through comparison of the falling waveform of the power supply voltage, state information of the door lock is sent to the cloud platform server through the GPRS communication circuit, and voice broadcasting is carried out through the voice playing circuit. The automobile door lock state identification device is simple and convenient, the automobile is not required to be changed, and the automobile door lock state can be identified only by connecting the device with an OBD interface.
Description
Technical Field
The invention relates to the field of automobile safety theft prevention, in particular to an automobile door lock state identification device and an automobile door lock state identification method.
Background
At present, in the anti-theft technology of an automobile, the automobile needs to be in a defending state after the automobile is locked, and needs to be in a disarming state after an automobile door lock is opened. However, this method requires a new wiring change to the vehicle, presents a safety hazard and is cumbersome to install.
The OBD interface of the automobile is provided with the power terminal directly coming from the automobile battery, the voltage waveform of the automobile battery end can be directly detected through the OBD socket, the method for detecting the automobile power waveform is adopted to judge the on-off state of the automobile door lock, the automobile door lock is simple and convenient, the automobile is not required to be changed, and the detection device is only required to be connected with the OBD interface, so that the state of the automobile door lock can be identified.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the automobile door lock state identification device and the identification method, which adopt the method for detecting the waveform of an automobile power supply to judge the opening and closing state of an automobile door lock, are simple and convenient, do not need to change an automobile, and can realize the identification of the state of the automobile door lock only by connecting the device with an OBD interface.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a state recognition device for an automobile door lock comprises a single chip microcomputer control circuit, a voltage waveform detection circuit, a power management circuit, a GPRS communication circuit and a voice playing circuit.
The single-chip microcomputer control circuit is connected with the voltage waveform detection circuit, the GPRS communication circuit and the voice playing circuit, the input end of the voltage waveform detection circuit is connected with two ends of an automobile power supply through an automobile OBD interface, the falling waveform of the automobile power supply voltage is detected, the single-chip microcomputer control circuit receives the detected falling waveform of the power supply voltage through the voltage waveform detection circuit, the automobile door lock is judged to be in an open state or a closed state through comparison of the falling waveform of the power supply voltage, state information of the door lock is sent to the cloud platform server through the GPRS communication circuit, and voice broadcasting is carried out through the voice playing circuit.
The singlechip control circuit also sends a door lock state short message notice to the car owner through a SIM card built in the GPRS communication circuit.
The singlechip in the singlechip control circuit preferably has the model: STM32F103T8U6, it connects the DY output of voltage waveform detection circuit through the No. 32 pin, receive the mains voltage drop waveform signal that is detected by voltage waveform detection circuit, connect GPRS communication circuit through the No. 14, 20-22 pins, connect the voice playing circuit through the No. 33 pin.
The preferred chip model of the GPRS communication circuit is SIM808, is a GPRS+BT_GPS combined chip, is connected with a singlechip control circuit through pins 8, 9 and 14-16, is connected with a SIM card circuit through pins 29-32, is connected with a GSM antenna through pin 66, and is connected with a GPS antenna through pin 35.
The input ends VCC and GND of the voltage waveform detection circuit are respectively connected with two ends of an automobile power supply, drop waveforms of the automobile power supply voltage are detected, detected signals are amplified through operational amplifiers U6A and U6B, filtered through capacitors C23 and C25, current-limiting matching is conducted through a resistor R26, and finally the voltage waveform detection circuit is connected with a singlechip control circuit through an output end DY and sends the signals to the singlechip.
A method for identifying the state of an automobile door lock comprises the following steps:
firstly, when the automobile door lock is used for the first time, two different voltage drop waveforms of a power supply when the automobile door lock is opened and closed in two different states are required to be detected respectively, and the two voltage drop waveforms are stored.
And step two, during normal use, when the automobile door lock is opened or closed, the singlechip control circuit detects a voltage drop waveform through the voltage waveform detection circuit.
Step three, comparing the detected power supply voltage drop waveform with stored waveform data,
further, in the case of comparing two waveforms, a method for calculating a correlation coefficient of waveform fitting degree is adopted:
1) Three integration values of the two comparison waveforms are calculated according to a method of taking and approximate integration of discrete points of a computer:
wherein X is the waveform curve instant value of the first waveform, Y is the waveform curve instant value of the second waveform;
2) Calculating a correlation coefficient:
P XY a value of 0-1, P XY The closer the value is to 1, the greater the similarity of the two waveforms, P XY The closer the value is to 0, the less similar the two waveforms are.
Judging the similarity of the waveforms, judging the current door lock state as an open state when the similarity of the detected waveforms to the waveforms of the stored door locks is large, and judging the current door lock state as a closed state when the similarity of the detected waveforms to the waveforms of the stored door locks is large.
Fifthly, when the door lock is judged to be in an open state, voice broadcasting is carried out: and when the door lock is judged to be in a closed state, voice broadcasting is carried out: "have been armed".
Step six, the automobile door lock state information is sent to the cloud platform server through GPRS, and finally sent to the APP client of the user mobile phone through the cloud platform server, meanwhile, the SIM card built in the GPRS also sends the automobile door lock state information to the user mobile phone through a short message mode, and when the user mobile phone cannot receive information pushed by the APP, the user can be notified through the short message mode.
Compared with the prior art, the invention has the beneficial effects that:
1. the automobile door lock state identification device judges the opening and closing state of the automobile door lock by adopting the method for detecting the waveform of the automobile power supply, is simple and convenient, does not need to change the automobile, and can realize the identification of the state of the automobile door lock by only connecting the device with an OBD interface.
2. According to the automobile door lock state identification device, the GPRS communication mode is adopted, the automobile door lock state information is sent to the automobile owner mobile phone in an APP pushing mode and a SIM card sending short message mode built in the GPRS module through the cloud platform, and when the automobile owner mobile phone APP is not opened, the automobile door lock state information can be received, so that information transmission is guaranteed in time.
3. The power supply voltage waveform detected by the automobile door lock state recognition device is selected to be the power supply terminal on the OBD interface, and the terminal is directly connected with an automobile battery, is not interfered by other factors, and has high waveform detection accuracy.
Drawings
FIG. 1 is a block diagram of the system architecture of the present invention;
FIG. 2 is a block diagram of the circuit configuration of the present invention;
FIG. 3 is a schematic diagram of a single chip microcomputer control circuit of the present invention;
fig. 4 is a schematic diagram of a GPRS communication circuit of the present invention;
figure 5 is a schematic diagram of a SIM card circuit in a GPRS communication circuit of the present invention;
FIG. 6 is a schematic diagram of a voltage waveform detection circuit of the present invention;
FIG. 7 is a schematic diagram of a voice playback circuit of the present invention;
FIG. 8 is a schematic diagram of a power management circuit of the present invention, FIG. 1;
fig. 9 is a schematic diagram of the power management circuit of the present invention, fig. 2.
Detailed Description
The following detailed description of the embodiments of the invention is provided with reference to the accompanying drawings.
As shown in fig. 1 and 2, an automobile door lock state recognition device comprises a single chip microcomputer control circuit, a voltage waveform detection circuit, a power management circuit, a GPRS communication circuit and a voice playing circuit.
The single-chip microcomputer control circuit is connected with the voltage waveform detection circuit, the GPRS communication circuit and the voice playing circuit, the input end of the voltage waveform detection circuit is connected with two ends of an automobile power supply through an automobile OBD interface, the falling waveform of the automobile power supply voltage is detected, the single-chip microcomputer control circuit receives the detected falling waveform of the power supply voltage through the voltage waveform detection circuit, the automobile door lock is judged to be in an open state or a closed state through comparison of the falling waveform of the power supply voltage, state information of the door lock is sent to the cloud platform server through the GPRS communication circuit, and voice broadcasting is carried out through the voice playing circuit.
The singlechip control circuit also sends a door lock state short message notice to the car owner through a SIM card built in the GPRS communication circuit.
As shown in fig. 3, the preferred model of the single-chip microcomputer in the single-chip microcomputer control circuit is as follows: STM32F103T8U6, it connects the DY output of voltage waveform detection circuit through the No. 32 pin, receive the mains voltage drop waveform signal that is detected by voltage waveform detection circuit, connect GPRS communication circuit through the No. 14, 20-22 pins, connect the voice playing circuit through the No. 33 pin.
The 25 th pin and the 28 th pin of the singlechip are connected with an external programming port and are used for programming of a singlechip developer. And pins 2 and 3 of the singlechip are connected with the crystal oscillator circuit to provide a clock for the singlechip.
As shown in FIG. 4, the preferred chip model of the GPRS communication circuit is SIM808, which is a GPRS+BT_GPS combined chip, and is connected with the SCM control circuit through pins 8, 9 and 14-16, the SIM card circuit through pins 29-32, the GSM antenna through pin 66 and the GPS antenna through pin 35.
Fig. 5 is a schematic diagram of a SIM card circuit in the GPRS communication circuit, pins 1-6 of the SIM card with the model SIM6 are connected with a SIM808 chip of the GPRS communication circuit, and the single-chip microcomputer reads and stores information from the SIM card through the SIM808GPRS communication chip.
As shown in fig. 6, the input ends VCC and GND of the voltage waveform detection circuit are respectively connected to two ends of the automobile power supply, detect the falling waveform of the automobile power supply voltage, amplify the detected signal through operational amplifiers U6A and U6B, filter the detected signal through capacitors C23 and C25, perform current limiting matching through a resistor R26, and finally connect to the single chip microcomputer control circuit through an output end DY, and send the signal to the single chip microcomputer.
As shown in fig. 7, the voice chip U3 is connected to the YIN end of the 33 th pin of the single-chip microcomputer through the 3 rd pin, receives control information of the single-chip microcomputer, and prompts voice information through the 4 th pin and the 5 th pin connecting horn, and when the door lock is judged to be in an open state, performs voice broadcasting: and when the door lock is judged to be in a closed state, voice broadcasting is carried out: "have been armed".
As shown in fig. 8 and 9, the power management circuit includes a 3.3V power circuit and a 4.2V power circuit, wherein the 3.3V power circuit is preferably a PAM3101-3.3,4.2V power circuit with a PAM model, the 3.3V power circuit is preferably a TPS54332 power circuit with a PAM model, the 3.3V power supply is used for supplying power to the singlechip control circuit, and the 4.2V power supply is used for supplying power to the voltage waveform detection circuit, the GPRS communication circuit and the voice playing circuit.
The 3.3V voltage stabilizing chip MAX1615 is a linear voltage stabilizing chip, the 4.2V voltage stabilizing chip TPS54332 is a DC-DC switch voltage stabilizing chip, and can provide a high-power supply for the GPRS communication module.
A method for identifying the state of an automobile door lock comprises the following steps:
firstly, when the automobile door lock is used for the first time, two different voltage drop waveforms of a power supply when the automobile door lock is opened and closed in two different states are required to be detected respectively, and the two voltage drop waveforms are stored.
And step two, during normal use, when the automobile door lock is opened or closed, the singlechip control circuit detects a voltage drop waveform through the voltage waveform detection circuit.
Step three, comparing the detected power supply voltage drop waveform with stored waveform data,
further, in the case of comparing two waveforms, a method for calculating a correlation coefficient of waveform fitting degree is adopted:
1) Three integration values of the two comparison waveforms are calculated according to a method of taking and approximate integration of discrete points of a computer:
wherein X is the instantaneous value of the waveform curve of the first waveform, Y is the instantaneous value of the waveform curve of the second waveform
2) Calculating a correlation coefficient:
P XY a value of 0-1, P XY The closer the value is to 1, the greater the similarity of the two waveforms, P XY The closer the value is to 0, the less similar the two waveforms are.
Judging the similarity of the waveforms, judging the current door lock state as an open state when the similarity of the detected waveforms to the waveforms of the stored door locks is large, and judging the current door lock state as a closed state when the similarity of the detected waveforms to the waveforms of the stored door locks is large.
Fifthly, when the door lock is judged to be in an open state, voice broadcasting is carried out: and when the door lock is judged to be in a closed state, voice broadcasting is carried out: "have been armed".
Step six, the automobile door lock state information is sent to the cloud platform server through GPRS, and finally sent to the APP client of the user mobile phone through the cloud platform server, meanwhile, the SIM card built in the GPRS also sends the automobile door lock state information to the user mobile phone through a short message mode, and when the user mobile phone cannot receive information pushed by the APP, the user can be notified through the short message mode.
The above examples are implemented on the premise of the technical scheme of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the above examples. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (4)
1. A door lock state identification method of an automobile door lock state identification device comprises a singlechip control circuit, a voltage waveform detection circuit, a power management circuit, a GPRS communication circuit and a voice playing circuit;
the single-chip microcomputer control circuit is connected with the voltage waveform detection circuit, the GPRS communication circuit and the voice playing circuit, the input end of the voltage waveform detection circuit is connected with the two ends of an automobile power supply through an automobile OBD interface, the falling waveform of the automobile power supply voltage is detected, the single-chip microcomputer control circuit receives the detected falling waveform of the power supply voltage through the voltage waveform detection circuit, the state of an automobile door lock is judged to be in an open state or a closed state through comparison of the falling waveform of the power supply voltage, state information of the door lock is sent to the cloud platform server through the GPRS communication circuit, and voice broadcasting is carried out through the voice playing circuit;
the singlechip control circuit also sends a door lock state short message notice to the vehicle owner through a SIM card built in the GPRS communication circuit;
the method is characterized by comprising the following steps:
firstly, when the automobile door lock is used for the first time, two different voltage drop waveforms of a power supply when the automobile door lock is opened and closed in two different states are required to be detected respectively, and the two voltage drop waveforms are stored;
step two, during normal use, when the automobile door lock is opened or closed, the singlechip control circuit detects a voltage drop waveform through the voltage waveform detection circuit;
step three, comparing the detected power supply voltage drop waveform with stored waveform data,
when two waveforms are compared, a method for calculating a waveform fitting degree correlation coefficient is adopted:
1) Three integration values of the two comparison waveforms are calculated according to a method of taking and approximate integration of discrete points of a computer:
wherein X is the waveform curve instant value of the first waveform, Y is the waveform curve instant value of the second waveform;
2) Calculating a correlation coefficient:
P XY a value of 0-1, P XY The closer the value is to 1, the more the two waveforms are representedThe greater the similarity, P XY The closer the value is to 0, the less similar the two waveforms are;
judging the similarity of the waveforms, namely judging the current door lock state as an open state when the similarity of the detected waveforms to the waveforms of the stored door locks is large, and judging the current door lock state as a closed state when the similarity of the detected waveforms to the waveforms of the stored door locks is large;
fifthly, when the door lock is judged to be in an open state, voice broadcasting is carried out: and when the door lock is judged to be in a closed state, voice broadcasting is carried out: "armed";
step six, the automobile door lock state information is sent to the cloud platform server through GPRS, and finally sent to the APP client of the user mobile phone through the cloud platform server, meanwhile, the SIM card built in the GPRS also sends the automobile door lock state information to the user mobile phone through a short message mode, and when the user mobile phone cannot receive information pushed by the APP, the user can be notified through the short message mode.
2. The door lock state recognition method of the automobile door lock state recognition device according to claim 1, wherein the single-chip microcomputer in the single-chip microcomputer control circuit is as follows: STM32F103T8U6, it connects the DY output of voltage waveform detection circuit through the No. 32 pin, receive the mains voltage drop waveform signal that is detected by voltage waveform detection circuit, connect GPRS communication circuit through the No. 14, 20-22 pins, connect the voice playing circuit through the No. 33 pin.
3. The door lock state recognition method of the automobile door lock state recognition device according to claim 1, wherein the GPRS communication circuit chip is of a SIM808 type, is a GPRS+BT_GPS combined chip, is connected with a singlechip control circuit through pins 8, 9 and 14-16, is connected with a SIM card circuit through pins 29-32, is connected with a GSM antenna through pins 66, and is connected with a GPS antenna through pins 35.
4. The door lock state recognition method of the automobile door lock state recognition device according to claim 1, wherein input ends VCC and GND of the voltage waveform detection circuit are respectively connected with two ends of an automobile power supply, drop waveforms of the automobile power supply voltage are detected, detected signals are amplified through operational amplifiers U6A and U6B, filtering is carried out through capacitors C23 and C25, current limiting matching is carried out through a resistor R26, and finally the signals are connected with a single chip microcomputer control circuit through an output end DY and sent to the single chip microcomputer.
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| CN201710351101.7A CN107187419B (en) | 2017-05-18 | 2017-05-18 | Automobile door lock state identification device and identification method |
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| CN201710351101.7A CN107187419B (en) | 2017-05-18 | 2017-05-18 | Automobile door lock state identification device and identification method |
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| CN107187419B true CN107187419B (en) | 2023-08-08 |
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| CN112362990A (en) * | 2020-10-30 | 2021-02-12 | 上汽大众汽车有限公司 | Device and method for measuring reliability of electronic door lock system |
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| CN107187419A (en) | 2017-09-22 |
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