CN112882456B - OBD equipment - Google Patents
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- CN112882456B CN112882456B CN202110043695.1A CN202110043695A CN112882456B CN 112882456 B CN112882456 B CN 112882456B CN 202110043695 A CN202110043695 A CN 202110043695A CN 112882456 B CN112882456 B CN 112882456B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0221—Preprocessing measurements, e.g. data collection rate adjustment; Standardization of measurements; Time series or signal analysis, e.g. frequency analysis or wavelets; Trustworthiness of measurements; Indexes therefor; Measurements using easily measured parameters to estimate parameters difficult to measure; Virtual sensor creation; De-noising; Sensor fusion; Unconventional preprocessing inherently present in specific fault detection methods like PCA-based methods
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Abstract
The embodiment of the invention relates to the technical field of vehicle-mounted diagnosis, and discloses OBD equipment, which comprises: the controller, the power supply and the loop detection circuit; the loop detection circuit comprises a resistor R1 and a resistor R2, one end of the resistor R1 is connected with the positive pole of the power supply, and the other end of the resistor R3526 is connected with the resistor R2 and the battery positive pole pin of the OBD connector respectively; one end of the resistor R2 is connected with the resistor R1, and the other end of the resistor R2 is respectively connected with the negative electrode of the power supply and the grounding pin of the OBD connector; a first sampling point is arranged between the resistor R1 and a battery positive pin of the OBD connector, a second sampling point is arranged between the resistor R1 and the resistor R2, and the first sampling point and the second sampling point are respectively connected with the controller. Through the circuit, the controller can determine the connection state of the OBD equipment and the OBD interface of the vehicle according to the sampling signals detected by the first sampling point and the second sampling point, so that whether the OBD equipment is removed from the vehicle or not is accurately detected.
Description
Technical Field
The embodiment of the invention relates to the technical field of vehicle-mounted diagnosis, in particular to OBD equipment.
Background
With the continuous development of automobile technology, the number of automobile functional parts is increased, and the requirements for monitoring and diagnosing each module of the automobile are higher and higher. On-Board Diagnostics (OBD) is an integrated system that can monitor the operation of each functional module of a vehicle in real time. For example, vehicle driving parameters, engine operating conditions, exhaust treatment emissions, etc. may be monitored. The OBD system of the vehicle is provided with an OBD interface into which an external OBD device can access the OBD system of the vehicle by inserting an OBD connector to read various OBD data of the vehicle. Particularly for some commercial vehicles, the supervision department needs to monitor the running state of the vehicle in real time through an OBD device connected to an OBD interface of the vehicle. In some cases, vehicle operators may remove OBD devices to circumvent real-time monitoring by regulatory authorities.
In the process of implementing the embodiment of the present invention, the inventors found that: the existing on-board diagnosis technology lacks the function of detecting the connection state of an OBD device and an OBD interface of a vehicle.
Disclosure of Invention
In view of the above problems, embodiments of the present invention provide an OBD device, which is used to solve the problem existing in the prior art that the function of detecting the connection status of the OBD device and the OBD interface of the vehicle is missing.
According to an aspect of an embodiment of the present invention, there is provided an OBD device including: the controller, the power supply and the loop detection circuit;
the loop detection circuit is respectively connected with the controller, the power supply and the OBD connector;
the OBD connector is used for connecting the OBD device with a vehicle OBD interface;
wherein the loop detection circuit comprises a resistor R1 and a resistor R2,
one end of the resistor R1 is connected with the positive electrode of the power supply, the other end of the resistor R1 is respectively connected with the resistor R2 and the battery positive electrode pin of the OBD connector, and the battery positive electrode pin is used for being connected with the positive electrode of a storage battery of a vehicle through the vehicle OBD interface;
one end of the resistor R2 is connected with the other end of the resistor R1, and the other end of the resistor R2 is respectively connected with the negative electrode of the power supply and the grounding pin of the OBD connector; the grounding pin is used for being connected with the negative electrode of a storage battery of a vehicle through the vehicle OBD interface;
a first sampling point is arranged between the resistor R1 and the battery positive pin of the OBD connector, a second sampling point is arranged between the resistor R1 and the resistor R2, and the first sampling point and the second sampling point are respectively connected with the controller;
the controller is used for acquiring sampling signals respectively acquired by the first sampling point and the second sampling point and determining the connection state of the OBD equipment and the vehicle OBD interface according to the sampling signals.
In an optional mode, the loop detection circuit further comprises a diode D1, the anode of the diode D1 is connected with the resistor R1, and the cathode of the diode D1 is connected with the battery anode pin of the OBD connector;
the first sampling point is disposed between the diode D1 and the battery positive pin of the OBD connector.
In an optional manner, the loop detection circuit further includes a diode D2, an anode of the diode D2 is connected to the resistor R1, and a cathode of the diode D2 is connected to the resistor R2;
the second sampling point is arranged between the diode D2 and the resistor R2.
In an optional mode, the loop detection circuit further comprises a diode D3, the anode of the diode D3 is connected with the battery anode pin of the OBD connector, and the cathode of the diode D3 is connected with the first sampling point.
In an optional mode, the loop detection circuit further comprises a transient diode D4, the anode of the transient diode D4 is connected with the ground pin of the OBD connector, and the cathode of the transient diode D4 is connected with the battery anode pin of the OBD connector.
In an optional mode, when the OBD connector is connected with an OBD interface of a vehicle, a load resistor R3 is formed between a positive electrode pin and a ground pin of a battery of the OBD connector, and the resistance value of the resistor R2 is larger than or equal to ten times that of the load resistor R3.
In an optional mode, the resistance value of the resistor R2 is larger than that of the resistor R1; the resistance value of the resistor R1 is greater than or equal to ten times the resistance value of the load resistor R3.
In an optional mode, the OBD device further includes a voltage stabilizing chip disposed between the positive electrode of the power supply and the resistor R1.
In an optional manner, the sampling signal is a voltage signal, and the determining the connection state of the OBD device and the vehicle OBD interface according to the sampling signal includes:
when the controller detects that the voltage collected by the first sampling point is equal to the positive voltage of the storage battery of the vehicle, the OBD device is judged to be in a connection state with an OBD interface of the vehicle;
when the controller detects that the voltage acquired by the first sampling point is smaller than the positive voltage of the storage battery of the vehicle, the controller detects the voltage acquired by the second sampling point, and when the voltage acquired by the second sampling point is equal to a first reference value, the OBD device and the OBD interface of the vehicle are judged to be in a connection state; and when the voltage acquired by the second sampling point is equal to a second reference value, judging that the OBD equipment and the vehicle OBD interface are in a disconnected state, wherein the first reference value is smaller than the second reference value.
In an optional manner, the apparatus further comprises: a communication module; the communication module is connected with the controller and used for sending warning information to the server when the OBD equipment is judged to be disconnected with the OBD interface of the vehicle by the controller.
The OBD device provided by the embodiment of the invention comprises a controller, a power supply and a loop detection circuit, wherein the loop detection circuit is respectively connected with the controller, the power supply and an OBD connector, the loop detection circuit comprises a resistor R1 and a resistor R2, a first sampling point is arranged between a resistor R1 and a battery positive pin of the OBD connector, a second sampling point is arranged between a resistor R1 and a resistor R2, and the first sampling point and the second sampling point are respectively connected with the controller. Through above-mentioned equipment, the controller can judge this OBD equipment and the connected state of vehicle OBD interface according to the sampling signal of first sampling point and second sampling point detection to whether realized the accurate detection of removing from the vehicle to the OBD equipment.
The foregoing description is only an overview of the technical solutions of the embodiments of the present invention, and the embodiments of the present invention can be implemented according to the content of the description in order to make the technical means of the embodiments of the present invention more clearly understood, and the detailed description of the present invention is provided below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present invention more clearly understandable.
Drawings
The drawings are only for purposes of illustrating embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic diagram illustrating a vehicle and an OBD device connection provided by an embodiment of the present invention;
fig. 2 shows a schematic circuit diagram of an OBD device provided by an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein.
The embodiment of the invention is mainly applied to a scene of detecting the connection state of the vehicle OBD interface and the external OBD equipment. Fig. 1 shows a schematic diagram of a vehicle and an OBD device connection provided by an embodiment of the present invention. As shown in fig. 1, the OBD device is connected to the OBD interface of the vehicle through an OBD connector to acquire vehicle data, and may transmit the operation data of the vehicle to a server of a supervision department in real time through a network. The vehicle OBD interface is connected with a storage battery of the vehicle. The OBD connector is used for connecting the OBD equipment with an OBD interface of a vehicle, can be integrated on the OBD equipment, can be independently arranged externally and is connected with the OBD equipment through a lead. Generally, the vehicle OBD system interfaces with 16 PINs (PINs or PINs) including a battery positive PIN connected to the vehicle battery positive pole and a ground PIN connected to the vehicle battery negative pole. Correspondingly, the OBD connector of the OBD device also comprises a battery positive electrode pin and a grounding pin. In most cases, PIN16 in the OBD interface or connector is the battery positive PIN and PIN4 (body ground) or PIN5 (signal ground) is the ground PIN. Since each electrical component in the vehicle needs a storage battery to supply power, such as an ECM (Electronic Control Module), there is a certain load between the positive electrode pin and the ground pin of the battery of the OBD interface. Fig. 2 shows a schematic circuit diagram of an OBD device provided by an embodiment of the present invention. As shown in fig. 2, the OBD apparatus includes: controller, power supply and return circuit detection circuit.
The loop detection circuit is respectively connected with the controller, the power supply and the OBD connector;
the OBD connector is used for connecting the OBD device with a vehicle OBD interface;
the loop detection circuit comprises a resistor R1 and a resistor R2, wherein one end of the resistor R1 is connected with the positive electrode of the power supply, the other end of the resistor R1 is respectively connected with a resistor R2 and a battery positive electrode pin of the OBD connector, and the battery positive electrode pin is used for connecting the positive electrode of a storage battery of the vehicle through an OBD interface of the vehicle; one end of the resistor R2 is connected to the other end of the resistor R1, and the other end of the resistor R2 is connected to the negative electrode of the power supply and the ground pin of the OBD connector, respectively; the grounding pin is used for connecting the negative electrode of a storage battery of a vehicle through the vehicle OBD interface;
a first sampling point is arranged between the resistor R1 and the battery positive pin of the OBD connector, a second sampling point is arranged between the resistor R1 and the resistor R2, and the first sampling point and the second sampling point are respectively connected with the controller;
the controller is used for acquiring sampling signals respectively acquired by the first sampling point and the second sampling point and determining the connection state of the OBD equipment and the OBD interface of the vehicle according to the sampling signals.
Specifically, the controller may be a main control chip such as an MCU (micro controller Unit), a single chip microcomputer, or a processor. The first sampling point may be a point F in fig. 2, and the second sampling point may be a point E in fig. 2.
In some cases, the battery positive pin of an OBD connector may have an abnormally positive or negative high voltage. For example, in the case where the OBD connector is plugged into an OBD interface of a vehicle, the pulse of the storage battery fluctuates when the vehicle is suddenly started or stopped, or the voltage of the positive electrode of the storage battery changes suddenly and sharply due to sudden increase of the electrical load of the vehicle; in the event that the OBD connector is disconnected from the OBD interface of the vehicle, an object with static electricity may also touch the battery positive pin of the OBD connector causing abnormal voltage fluctuations. And the abnormal positive or negative high voltage may damage components in the OBD device, particularly the controller. Preferably, some elements can be added on the basis of the circuit to protect the controller.
In an alternative embodiment, the above-mentioned loop detection circuit further includes a diode D1, the anode of the diode D1 is connected to the resistor R1, and the cathode of the diode D1 is connected to the battery anode pin of the OBD connector; the first sampling point is disposed between the diode D1 and the battery positive pin of the OBD connector.
In an alternative embodiment, the loop detection circuit further includes a diode D2, an anode of the diode D2 is connected to the resistor R1, and a cathode of the diode D2 is connected to the resistor R2; the second sampling point is arranged between the diode D2 and the resistor R2.
The diode D1 can effectively prevent the positive high voltage on the battery anode pin of the OBD connector from damaging the controller through the second sampling point; the negative high voltage on the battery positive pin of the OBD connector can be effectively prevented from damaging the controller through the second sampling point by the diode D2.
In an alternative embodiment, the loop detection circuit further includes a diode D3, an anode of the diode D3 is connected to the battery anode pin of the OBD connector, and a cathode of the diode D3 is connected to the first sampling point.
In an optional embodiment, the loop detection circuit further comprises a transient diode D4, wherein an anode of the transient diode D4 is connected to the ground pin of the OBD connector, and a cathode of the transient diode D4 is connected to the battery anode pin of the OBD connector.
The negative high voltage on the battery positive pin of the OBD connector can be effectively prevented from damaging the controller through the first sampling point by the diode D3. The Transient Voltage Super (TVS) is a diode-type high-efficiency protection device, and can stabilize the Voltage in the circuit. The positive high voltage on the battery positive pin of the OBD connector is effectively prevented from damaging the controller through the first sampling point by the transient diode D4.
As mentioned above, when the OBD connector is connected to the vehicle OBD interface, a load resistor R3 is formed between the battery positive pin and the ground pin of the OBD connector, and in order to allow the OBD connector to be plugged into the vehicle OBD interface and allow current to pass through the load resistor R3 when the vehicle battery is disconnected, in an optional embodiment, the resistance value of the resistor R2 is much larger than that of the load resistor R3, and preferably, the resistance value of the resistor R2 is ten times or more greater than that of the load resistor R3.
In order to make the sampling signal at the second sampling point have a significant change, in an alternative embodiment, the resistance value of the resistor R2 is greater than that of the resistor R1; the resistance of the resistor R1 is much larger than that of the load resistor R3, and preferably, the resistance of the resistor R1 is larger than or equal to ten times that of the load resistor R3.
In an optional embodiment, the OBD device further includes a voltage stabilizing chip disposed between the positive electrode of the power supply and the resistor R1, so as to make the output voltage of the power supply smoother and more stable, and reduce the false detection rate of the OBD device.
In an alternative embodiment, the voltage of the positive electrode of the power supply is lower than the voltage of the positive electrode of the battery of the vehicle.
In an optional embodiment, the sampling signal is a voltage signal, and the determining the connection state of the OBD device and the vehicle OBD interface according to the sampling signal includes:
when the controller detects that the voltage collected by the first sampling point is equal to the positive voltage of the storage battery of the vehicle, the OBD device is judged to be in a connection state with an OBD interface of the vehicle;
when the controller detects that the voltage acquired by the first sampling point is smaller than the positive voltage of the storage battery of the vehicle, the controller detects the voltage acquired by the second sampling point, and when the voltage acquired by the second sampling point is equal to a first reference value, the OBD device and the OBD interface of the vehicle are judged to be in a connection state; and when the voltage acquired by the second sampling point is equal to a second reference value, judging that the OBD equipment and the vehicle OBD interface are in a disconnected state, wherein the first reference value is smaller than the second reference value.
Specifically, the controller may detect the voltage at the first sampling point all the time, or may detect the voltage at regular intervals, for example, 1 to 30 minutes. Preferably, in the embodiment of the present invention, the controller always detects the voltage at the first sampling point.
Specifically, the principle of detecting and judging the connection state of the OBD device and the OBD interface of the vehicle by the controller is as follows:
1. in the case where the vehicle's battery is connected to the vehicle OBD interface.
If the OBD device is in a plug-in state with the OBD interface of the vehicle, the voltage of a first sampling point (point F) connected with a battery positive pin of the OBD connector is the positive voltage of the vehicle storage battery. The voltage of the positive electrode of the vehicle storage battery is usually 12V +/-2V or 24V +/-3V, and the voltage of the positive electrode of the vehicle storage battery can be flexibly adjusted according to actual conditions, and is not limited herein. Therefore, as long as the controller detects that the voltage of the first sampling point is equal to the positive voltage of the vehicle storage battery, the OBD device and the vehicle OBD interface can be judged to be in a connected state.
2. In the event that the vehicle's battery is disconnected from the vehicle OBD interface.
If the OBD device is in a plug-in state with the OBD interface of the vehicle, most of the current flows from the positive pole of the power supply to the negative pole of the power supply through the resistor R1, the diode D1 and the load resistor R3 because the resistance value of the resistor R2 is far larger than that of the load resistor R3. As described above, the voltage of the positive electrode of the power supply is smaller than the voltage of the positive electrode of the vehicle battery, that is, the voltage at point a is smaller than the voltage at point C in fig. 2, and the resistance value of the resistor R1 is much larger than the resistance value of the load resistor R3, so the voltages at points B, C and the first sampling point (point F) are much smaller than the voltage of the positive electrode of the vehicle battery. Assuming that the positive voltage of the power supply is 5V, the voltages at the B point, the C point, and the first sampling point (F point) may be only 1V. The current flowing to the cathode of the power supply through the diode D2 and the resistor R2 is small, the voltage at the second sampling point (point E) is also relatively low, and the voltage tends to be 1V as compared with the voltages at the points B, C and F. At this time, the voltage value of the second sampling point is the first reference value, and the first reference value may be a voltage range, and may be flexibly set according to the actual situation, which is not limited herein. Therefore, when the controller detects that the voltage of the first sampling point is smaller than the positive voltage of the vehicle storage battery and the voltage of the second sampling point is equal to the first reference value, the OBD device and the vehicle OBD interface can be judged to be in a connection state.
3. The OBD device is in a disconnected state with the vehicle OBD interface.
For example, the vehicle operator pulls the OBD connector off the vehicle OBD interface, and at this time, the battery positive pin of the OBD connector is disconnected from the positive electrode of the vehicle battery, and the load disconnection between the battery positive pin of the OBD connector and the ground pin is in an open circuit state, regardless of whether the battery of the vehicle is connected to the vehicle OBD interface or not. At this time, the current flows from the positive electrode of the power supply to the negative electrode of the power supply through the resistor R1, the diode D2 and the resistor R2, and the voltage at the second sampling point (point E) is the second reference value. Since the resistance of the resistor R2 is larger than the resistance of the resistor R1, the second reference value is higher than the first reference value, that is, when the OBD device is disconnected from the OBD interface of the vehicle, the voltage of the second sampling point rises from the first reference value to the second reference value, and there is a significant change. If the voltage of the positive electrode of the power supply is 5V, the second reference value may be 4V. And the voltages at the points B, C and the first sampling point (point F) and the voltage at the point E tend to be consistent to be 4V. Similarly, the second reference value may be a voltage range, and may be flexibly set according to practical situations, which is not limited herein. Therefore, when the controller detects that the voltage of the first sampling point is smaller than the positive voltage of the vehicle storage battery and the voltage of the second sampling point is equal to the second reference value, the OBD device and the vehicle OBD interface can be judged to be in a disconnected state, and the OBD device is removed from the vehicle.
In an optional embodiment, the OBD device further comprises: a communication module; the communication module is connected with the controller and used for sending warning information to the server when the OBD equipment and the vehicle OBD interface are in a disconnected state according to judgment of the controller.
Specifically, the OBD device may be a dedicated OBD monitoring device used by a monitoring department for monitoring the operating state of the vehicle. The communication module can be an element with Bluetooth, Wi-Fi or 4G/5G mobile communication functions. The communication module is connected with a server of a supervision department through a network, and sends warning information to the server when receiving an indication that the OBD equipment and an OBD interface of the vehicle are in a disconnected state, wherein the indication is sent by the controller, so that the supervision department is informed that the OBD equipment is removed from the vehicle. The warning information may include a start time of the off state and operation data of the vehicle during the off state.
In an optional embodiment, the OBD device further comprises: an alarm module; the alarm module is connected with the controller and used for sending out an alarm prompt when the OBD equipment and the vehicle OBD interface are in a disconnected state according to judgment of the controller.
Specifically, this alarm module can be for having buzzing or voice prompt function's component, when receiving the OBD equipment that the controller sent and the instruction that the vehicle OBD interface is in the off-state, sends the warning to the vehicle control personnel to impel it to be connected OBD equipment and vehicle OBD interface.
In an optional embodiment, the OBD device further comprises: a recording module; the recording module is connected with the controller and used for recording the starting time of the disconnection state and the monitoring data of the OBD equipment when the OBD equipment and the OBD interface of the vehicle are in the disconnection state.
Specifically, the recording module is an element with a data storage function, and can store the starting time of the off state and the running data of the vehicle for subsequent checking when receiving an indication that the OBD device and the OBD interface of the vehicle are in the off state sent by the controller.
The OBD device provided by the embodiment of the invention comprises a controller, a power supply and a loop detection circuit, wherein the loop detection circuit is respectively connected with the controller, the power supply and an OBD connector, the loop detection circuit comprises a resistor R1 and a resistor R2, a first sampling point is arranged between a resistor R1 and a battery positive pin of the OBD connector, a second sampling point is arranged between a resistor R1 and a resistor R2, and the first sampling point and the second sampling point are respectively connected with the controller. Through above-mentioned circuit, the controller can judge the connected state of OBD equipment and vehicle OBD interface according to the sampling signal of first sampling point and second sampling point detection to whether realized the accurate detection of removing from the vehicle to the OBD equipment.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the invention and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names. The steps in the above embodiments should not be construed as limiting the order of execution unless specified otherwise.
Claims (10)
1. An OBD device, comprising: the controller, the power supply and the loop detection circuit;
the loop detection circuit is respectively connected with the controller, the power supply and the OBD connector;
the OBD connector is used for connecting the OBD device with a vehicle OBD interface;
wherein the loop detection circuit comprises a resistor R1 and a resistor R2,
one end of the resistor R1 is connected with the positive electrode of the power supply, the other end of the resistor R1 is respectively connected with the resistor R2 and the battery positive electrode pin of the OBD connector, and the battery positive electrode pin is used for being connected with the positive electrode of a storage battery of a vehicle through the vehicle OBD interface;
one end of the resistor R2 is connected with the other end of the resistor R1, and the other end of the resistor R2 is respectively connected with the negative electrode of the power supply and the grounding pin of the OBD connector; the grounding pin is used for being connected with the negative electrode of a storage battery of a vehicle through the vehicle OBD interface;
a first sampling point is arranged between the resistor R1 and the battery positive pin of the OBD connector, a second sampling point is arranged between the resistor R1 and the resistor R2, and the first sampling point and the second sampling point are respectively connected with the controller; when the OBD connector is connected with a vehicle OBD interface, a load resistor R3 is formed between a battery anode pin and a ground pin of the OBD connector, and the resistance value of the resistor R2 is far larger than that of the load resistor R3, so that current passes through the load resistor R3 when the OBD connector is plugged with the vehicle OBD interface and a vehicle storage battery is disconnected;
the controller is used for acquiring sampling signals respectively acquired by the first sampling point and the second sampling point and determining the connection state of the OBD equipment and the vehicle OBD interface according to the sampling signals.
2. The OBD device of claim 1, wherein the loop detection circuit further comprises a diode D1, an anode of the diode D1 is connected to the resistor R1, and a cathode of the diode D1 is connected to a battery anode pin of the OBD connector;
the first sampling point is disposed between the diode D1 and the battery positive pin of the OBD connector.
3. The OBD device of claim 1, wherein the loop detection circuit further comprises a diode D2, the anode of the diode D2 being connected to the resistor R1, the cathode of the diode D2 being connected to the resistor R2;
the second sampling point is arranged between the diode D2 and the resistor R2.
4. The OBD device of claim 1, wherein the loop detection circuit further comprises a diode D3, the anode of the diode D3 being connected to the battery anode pin of the OBD connector, and the cathode of the diode D3 being connected to the first sampling point.
5. The OBD device of claim 1, wherein the loop detection circuit further comprises a transient diode D4, the anode of the transient diode D4 is connected to the ground pin of the OBD connector, and the cathode of the transient diode D4 is connected to the battery anode pin of the OBD connector.
6. The OBD device of any of claims 1-5, wherein the resistance of the resistor R2 is greater than or equal to ten times the resistance of the load resistor R3.
7. The OBD device of claim 6, wherein the resistance R2 is greater than the resistance R1; the resistance value of the resistor R1 is greater than or equal to ten times the resistance value of the load resistor R3.
8. The OBD device of claim 1, further comprising a voltage regulation chip disposed between the positive pole of the power source and the resistor R1.
9. The OBD device of any of claims 1-5, wherein the sampled signal is a voltage signal, and wherein determining the connection state of the OBD device to the vehicle OBD interface from the sampled signal comprises:
when the controller detects that the voltage collected by the first sampling point is equal to the positive voltage of the storage battery of the vehicle, the OBD device is judged to be in a connection state with an OBD interface of the vehicle;
when the controller detects that the voltage acquired by the first sampling point is smaller than the positive voltage of the storage battery of the vehicle, the controller detects the voltage acquired by the second sampling point, and when the voltage acquired by the second sampling point is equal to a first reference value, the OBD device and the OBD interface of the vehicle are judged to be in a connection state; and when the voltage acquired by the second sampling point is equal to a second reference value, judging that the OBD equipment and the vehicle OBD interface are in a disconnected state, wherein the first reference value is smaller than the second reference value.
10. The OBD device of claim 9, wherein the device further comprises: a communication module; the communication module is connected with the controller and used for sending warning information to the server when the OBD equipment is judged to be disconnected with the OBD interface of the vehicle by the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110043695.1A CN112882456B (en) | 2021-01-13 | 2021-01-13 | OBD equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110043695.1A CN112882456B (en) | 2021-01-13 | 2021-01-13 | OBD equipment |
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| Publication Number | Publication Date |
|---|---|
| CN112882456A CN112882456A (en) | 2021-06-01 |
| CN112882456B true CN112882456B (en) | 2022-04-12 |
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