CN111812554A - On-board diagnostic (OBD) interface plug-pull state detection device based on photoresistor and detection method thereof - Google Patents
On-board diagnostic (OBD) interface plug-pull state detection device based on photoresistor and detection method thereof Download PDFInfo
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- CN111812554A CN111812554A CN202010723552.0A CN202010723552A CN111812554A CN 111812554 A CN111812554 A CN 111812554A CN 202010723552 A CN202010723552 A CN 202010723552A CN 111812554 A CN111812554 A CN 111812554A
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- plug
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- obd interface
- photoresistor
- state
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/68—Testing of releasable connections, e.g. of terminals mounted on a printed circuit board
Abstract
The utility model provides a OBD interface plug state detection device based on photo resistance, includes plug, the external terminal of vehicle and the photo resistance that correspond with vehicle OBD interface, the plug passes through pencil and the external terminal connection of vehicle, photo resistance is fixed in the plug, the terminal surface of this plug has and is used for supplying photo resistance's sensitization portion accepts the opening of light, photo resistance's both ends respectively through the wiring with the external terminal connection of vehicle constitutes the electric circuit, the wiring is located in the pencil. The invention can directly detect the plugging state of the vehicle OBD interface and the plug in real time and has high efficiency.
Description
Technical Field
The invention belongs to the technical field of vehicle OBD interface plug-pull state detection, and particularly relates to an OBD interface plug-pull state detection device based on a photoresistor and a detection method thereof.
Background
In order to make a breakthrough, manufacturers in the automobile industry have focused on creating the concept of "internet of vehicles" on the intelligent application and information layer level, and "automobile safety" is one of the most concerned functions. In order to improve the reliability, safety and maintainability of automobiles, the diagnosis of the vehicle OBD is regarded by manufacturers. The OBD diagnosis of the automobile is a vehicle-mounted automatic detection system which is extended for automobile fault diagnosis, the OBD is used for assisting maintenance personnel to diagnose the automobile initially, and along with the development of automobile science and technology and the application of automobile networking technology, the OBD diagnosis is implemented and applied more and more widely on the basis of driving performance and emission diagnosis. The OBD diagnosis monitors whether the automobile emission has a problem according to the running condition of the engine, the fault lamp is lightened once the problem occurs, meanwhile, the power assembly records the fault on the memory, the fault code is read out from the PCM through a certain program, and the automobile maintenance detection equipment carries out automobile maintenance according to the fault code.
The OBD diagnosis system enables the automobile fault diagnosis to be simple and uniform, maintenance personnel do not need to study a new system of each manufacturer specially, and the maintenance personnel can determine the fault property and the fault position quickly according to fault code prompt. However, the vehicle OBD diagnostic equipment needs to be correctly connected with an OBD port on a vehicle to carry out maintenance operation, but in the using process, the situation that an OBD port automobile diagnostic instrument cannot be normally connected often occurs, under the situation, the problem that whether communication failure or OBD interface contact failure exists cannot be directly judged, and the problem is brought to detection work of engineers. However, this method is complex, consumes much time, cannot directly obtain a feedback signal that the OBD interface is not correctly connected, and requires additional equipment for detection, and the detection efficiency is low.
In addition, with the continuous tightening of national regulations on the requirements of heavy motor vehicle exhaust emission regulation, the adoption of the additionally-installed vehicle-mounted terminal equipment for reading the engine OBD information, the operation data and the emission data in real time is a very effective monitoring means, specific requirements are already made on the pollutant emission limit value and the measurement method of the GB17691-2018 heavy diesel vehicle and the sixth stage of China for the heavy motor vehicles with national emission, the vehicle is required to be provided with the emission monitoring vehicle-mounted terminal when leaving the factory, and the terminal and the engine controller are required to have the removal prevention function, but in the actual use process, a driver often does not pull down the OBD interface.
Disclosure of Invention
Based on this, to the above technical problem, an OBD interface plug state detection device based on a photoresistor and a detection method thereof are provided.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a OBD interface plug state detection device based on photo resistance, includes plug, the external terminal of vehicle and the photo resistance that correspond with vehicle OBD interface, the plug passes through pencil and the external terminal connection of vehicle, photo resistance is fixed in the plug, the terminal surface of this plug has and is used for supplying photo resistance's sensitization portion accepts the opening of light, photo resistance's both ends respectively through the wiring with the external terminal connection of vehicle constitutes the electric circuit, the wiring is located in the pencil.
This scheme still includes divider resistance, divider resistance is fixed in the plug, and establish ties in the circuit.
The end face of the plug is provided with a vertical slotted hole, and the photoresistor is fixed in the slotted hole.
And the photoresistor is fixedly adhered to the slotted hole.
The slot is located at the center of the end face of the plug.
The vehicle external terminal is an automobile diagnostic instrument or a vehicle-mounted terminal.
This scheme still relates to an OBD interface plug state detection method of OBD interface plug state detection device based on photo resistance, includes:
the resistance value of the photosensitive resistor is detected in real time by the vehicle external terminal, if the resistance value is larger than or equal to a preset resistance threshold value, the plug and the vehicle OBD interface are in a plug-in state, otherwise, the plug and the vehicle OBD interface are in a pull-out state.
This scheme still relates to an OBD interface plug state detection method of OBD interface plug state detection device based on photo resistance, includes:
the voltage of the photoresistor is detected by the external vehicle terminal in real time, if the voltage is larger than or equal to a preset voltage threshold value, the plug and the vehicle OBD interface are in a plug-in state, otherwise, the plug and the vehicle OBD interface are in a pull-out state.
This scheme still relates to an OBD interface plug state detection method of OBD interface plug state detection device based on photo resistance, includes:
the current of the photoresistor is detected in real time by an external vehicle terminal, if the current is smaller than or equal to a preset current threshold value, the plug and the vehicle OBD interface are in a plug-in state, otherwise, the plug and the vehicle OBD interface are in a pull-out state.
The invention can directly detect the plugging state of the vehicle OBD interface and the plug in real time, has high efficiency, saves troubleshooting time for maintainers, and can further warn a driver that the interface can not be plugged in the driving process after the plugging state is obtained in time.
Drawings
The invention is described in detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of an electrical circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electrical circuit according to another embodiment of the present invention.
Detailed Description
As shown in fig. 1, an OBD interface plugging/unplugging state detection apparatus based on a photo resistor includes a plug 110 corresponding to an OBD interface of a vehicle, an external vehicle terminal 120, and a photo resistor 130.
The plug 110 is connected to the vehicle external connection terminal 120 through a wire harness 140.
The photo resistor 130 is fixed in the plug 110, and an end surface of the plug 110 has an opening for receiving light from a light-sensing portion of the photo resistor, as shown in fig. 2, two ends of the photo resistor 130 are respectively connected to the vehicle external terminal 120 through a connection wire 141 to form an electrical circuit, and the connection wire 141 is arranged in the wiring harness 140, that is, a connection wire is added in addition to the original connection wire of the wiring harness.
The plug 110 is a male plug, so the end face is the end face within its socket.
The photo resistor 130 operates based on the internal photoelectric effect, and in a dark environment, its resistance is very high, and when it is illuminated and the light radiation energy is large enough, the electrons in the valence band jump to the conduction band after absorbing the photon energy to become free electrons, and at the same time, holes are generated, and the occurrence of electron-hole pairs decreases the resistivity, and the stronger the illumination, the lower the resistance.
Before the plug 110 is plugged with the vehicle OBD interface, the luminous flux of the photoresistor 130 is large, and after plugging, the luminous flux of the photoresistor 130 is small. Therefore, the characteristics of the photoresistor can be utilized to compare the resistance or current of the photoresistor with the corresponding threshold value, and the plugging and unplugging state of the OBD interface is judged:
the vehicle external terminal 120 detects the resistance value of the photo resistor 130 in real time, if the resistance value is greater than or equal to a preset resistance threshold value, the plug 110 and the vehicle OBD interface are in a plug-in state, otherwise, the plug 110 and the vehicle OBD interface are in a pull-out state.
Or, the vehicle external terminal 120 detects the current of the photo resistor 130 in real time, if the current is less than or equal to a preset current threshold, the plug 110 and the vehicle OBD interface are in a plug-in state, otherwise, the plug 110 and the vehicle OBD interface are in a pull-out state.
Certainly, a voltage dividing resistor can also be connected in series in the circuit, so that the voltage of the photoresistor can be compared with a corresponding threshold value, and the plugging and unplugging state of the OBD interface is judged:
the voltage of the photo resistor 130 is detected by the vehicle external terminal 120 in real time, if the voltage is greater than or equal to a preset voltage threshold, the plug 110 and the vehicle OBD interface are in a plug-in state, otherwise, the plug 110 and the vehicle OBD interface are in a pull-out state.
The invention can directly detect the plugging state of the vehicle OBD interface and the plug in real time, has high efficiency, saves troubleshooting time for maintainers, and can further warn a driver that the interface can not be plugged in the driving process after the plugging state is obtained in time.
In this embodiment, the end surface of the plug 110 is provided with a vertical slot, the photo-resistor 130 is fixed in the slot, and the opening of the slot is an opening for the photo-sensing portion of the photo-resistor to receive light.
The photo-resistor 130 is bonded and fixed to a slot hole located at the center of the end face of the plug. Of course, other locations are possible as long as the plug 110 does not interfere with the mating of the vehicle OBD interface.
In this embodiment, the vehicle external terminal 120 is an automobile diagnostic device or a vehicle-mounted terminal (such as a TBOX), and may be other devices that can be connected to a vehicle OBD interface through a wire harness and a plug.
As shown in fig. 3, in the present embodiment, a voltage dividing resistor 150 may be further disposed, and the voltage dividing resistor 150 is fixed in the plug 110 and is connected in series in the electrical circuit.
The invention also relates to an OBD interface plug-pull state detection method of the OBD interface plug-pull state detection device based on the photoresistor.
Example 1
In this embodiment, the detection method of the present invention includes:
the vehicle external terminal 120 detects the resistance value of the photo resistor 130 in real time, if the resistance value is greater than or equal to a preset resistance threshold value, the plug 110 and the vehicle OBD interface are in a plug-in state, otherwise, the plug 110 and the vehicle OBD interface are in a pull-out state.
Example 2
In this embodiment, the detection method of the present invention includes:
the voltage of the photo resistor 130 is detected by the vehicle external terminal 120 in real time, if the voltage is greater than or equal to a preset voltage threshold, the plug 110 and the vehicle OBD interface are in a plug-in state, otherwise, the plug 110 and the vehicle OBD interface are in a pull-out state.
The method of this embodiment relies on the voltage dividing resistor 150, so that when the resistance of the photo resistor changes, the voltage changes.
Example 3
In this embodiment, the detection method of the present invention includes:
the current of the light dependent resistor 130 is detected by the vehicle external terminal 120 in real time, if the current is less than or equal to a preset current threshold value, the plug 110 and the vehicle OBD interface are in a plug-in state, otherwise, the plug 110 and the vehicle OBD interface are in a pull-out state.
The threshold is set according to the parameters of the photoresistor itself. For example, when a model 5549 photo resistor is adopted, the resistance threshold value may be set to 500 kilohms, and when the resistance value is greater than or equal to 500 kilohms, the plug 110 and the vehicle OBD interface are in a plug-in state, and otherwise, the plug 110 and the vehicle OBD interface are in a plug-out state.
However, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present invention, and that changes and modifications to the above described embodiments are intended to fall within the scope of the appended claims, provided they fall within the true spirit of the present invention.
Claims (9)
1. The utility model provides a OBD interface plug state detection device based on photo resistance, its characterized in that includes plug, the external terminal of vehicle and photo resistance that correspond with vehicle OBD interface, the plug passes through pencil and the external terminal connection of vehicle, photo resistance is fixed in the plug, the terminal surface of this plug has and is used for supplying photo resistance's sensitization portion accepts the opening of light, photo resistance's both ends respectively through the wiring with the external terminal connection of vehicle constitutes the electric loop, the wiring is located in the pencil.
2. The device for detecting the plugging and unplugging state of the OBD interface based on the photoresistor according to claim 1, further comprising a voltage dividing resistor, wherein the voltage dividing resistor is fixed in the plug and is connected in series in the circuit loop.
3. The OBD interface plugging and unplugging state detection device based on the photoresistor as claimed in claim 2, wherein a vertical slot is formed in an end face of the plug, and the photoresistor is fixed in the slot.
4. The OBD interface plugging and unplugging state detection device based on the photoresistor according to claim 3, wherein the photoresistor is fixedly bonded with the slotted hole.
5. The device for detecting the plugging and unplugging state of the OBD interface based on the photoresistor as claimed in claim 4, wherein the slot is located at the center of the end face of the plug.
6. The device for detecting the plugging and unplugging state of the OBD interface based on the photoresistor according to claim 2 or 5, wherein the vehicle external terminal is an automobile diagnostic apparatus or a vehicle-mounted terminal.
7. The method for detecting the plugging and unplugging state of the OBD interface based on the photoresistor according to any one of claims 1 to 6, characterized by comprising the following steps:
the resistance value of the photosensitive resistor is detected in real time by the vehicle external terminal, if the resistance value is larger than or equal to a preset resistance threshold value, the plug and the vehicle OBD interface are in a plug-in state, otherwise, the plug and the vehicle OBD interface are in a pull-out state.
8. The method for detecting the plugging and unplugging state of the OBD interface based on the photoresistor according to any one of claims 2 to 6, characterized by comprising the following steps:
the voltage of the photoresistor is detected by the external vehicle terminal in real time, if the voltage is larger than or equal to a preset voltage threshold value, the plug and the vehicle OBD interface are in a plug-in state, otherwise, the plug and the vehicle OBD interface are in a pull-out state.
9. The method for detecting the plugging and unplugging state of the OBD interface based on the photoresistor according to any one of claims 1 to 6, characterized by comprising the following steps:
the current of the photoresistor is detected in real time by an external vehicle terminal, if the current is smaller than or equal to a preset current threshold value, the plug and the vehicle OBD interface are in a plug-in state, otherwise, the plug and the vehicle OBD interface are in a pull-out state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010723552.0A CN111812554A (en) | 2020-07-24 | 2020-07-24 | On-board diagnostic (OBD) interface plug-pull state detection device based on photoresistor and detection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010723552.0A CN111812554A (en) | 2020-07-24 | 2020-07-24 | On-board diagnostic (OBD) interface plug-pull state detection device based on photoresistor and detection method thereof |
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| CN111812554A true CN111812554A (en) | 2020-10-23 |
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| CN202010723552.0A Pending CN111812554A (en) | 2020-07-24 | 2020-07-24 | On-board diagnostic (OBD) interface plug-pull state detection device based on photoresistor and detection method thereof |
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