CN208953641U - A kind of equipment extraction detection circuit based on car OBD interface - Google Patents
A kind of equipment extraction detection circuit based on car OBD interface Download PDFInfo
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- CN208953641U CN208953641U CN201821483731.6U CN201821483731U CN208953641U CN 208953641 U CN208953641 U CN 208953641U CN 201821483731 U CN201821483731 U CN 201821483731U CN 208953641 U CN208953641 U CN 208953641U
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Abstract
The utility model relates to a kind of, and the equipment based on car OBD interface extracts detection circuit, including power supply, resistance, diode and P-MOS device；Wherein: the cathode of the power supply is connect with the pole D of the P-MOS device；The pole D of the P-MOS device is connected in equipment power ground；The anode of the power supply is connect with described resistance one end；The resistance other end is connect with the anode of the diode；On the resistance and the diode connecting line, it is provided with voltage detecting point；The cathode of the diode is connect with the pole S of the P-MOS device；The pole S of the P-MOS device is connected to device signal on the ground；The G of the P-MOS device is extremely hanging.The utility model provides a kind of equipment based on car OBD interface and extracts detection circuit, by the setting of power supply, resistance, diode, P-MOS device and voltage detecting point, realizes the detection extracted to equipment, meets the extraction decision logic of all vehicles.
Description
Technical field
The utility model relates to mobile units to extract detection technique field, more particularly to a kind of be based on automobile OBD
The equipment of interface extracts detection circuit.
Background technique
It is well known that the type of current automobile is extremely more, and various trendy automobiles are also listed constantly
In, standard interface of the OBD interface as auto electric, can generally provide power supply VCC, bus CAN, K-LINE, power ground,
The contacts such as signal ground.All OBD device products detect whether it is pulled out at present, be all using power supply status as interpretation foundation,
However have part vehicle under switch-off state, the built-in system of automobile can disconnect the VCC power supply of OBD in short-term or for a long time,
The method whether this detection power supply VCC disconnects, is unable to satisfy the extraction decision logic of this kind of vehicle.
Utility model content
In order to solve the extraction decision logic that the prior art is unable to satisfy part vehicle, existing correctly to be pulled out detection device
The technological deficiency to do well provides a kind of equipment extraction detection circuit based on car OBD interface.
To realize the above purpose of utility model, the technical solution adopted is that:
A kind of equipment extraction detection circuit based on car OBD interface, including power supply, resistance, diode and P-MOS device
Part；Wherein:
The cathode of the power supply is connect with the pole D of the P-MOS device；
The pole D of the P-MOS device is connected in equipment power ground；
The anode of the power supply is connect with described resistance one end；
The resistance other end is connect with the anode of the diode；
On the resistance and the diode connecting line, it is provided with voltage detecting point；
The cathode of the diode is connect with the pole S of the P-MOS device；
The pole S of the P-MOS device is connected to device signal on the ground；
The G of the P-MOS device is extremely hanging.
Wherein, the extraction detection circuit is arranged on OBD interface loop, the OBD interface loop include power interface,
Equipment power ground interface and device signal ground interface；External equipment is believed by the power interface, equipment power ground interface, equipment
Number ground interface be connected on the OBD interface loop.
Wherein, when external equipment is connect with the OBD interface loop, the voltage detecting point voltage VuEqual to described two
Pole pipe voltage Vd1；When external equipment and the OBD interface loop disconnect, the voltage detecting point voltage VuEqual to the resistance
Voltage Vr, that is, it is equal to the P-MOS device voltage Vp。
In above scheme, when external equipment is connect with the OBD interface loop, the included power supply of external equipment is alternative
Power supply in detection circuit is resistance, diode power supply；And when external equipment and the OBD interface loop disconnect, then by examining
Power supply in slowdown monitoring circuit is resistance, diode power supply, is pulled out by the equipment that OBD interface can be obtained in the value of voltage detecting point voltage
It does well, completes the detection that equipment is extracted.
In above scheme, equipment power ground and device signal are associated together by P-MOS device, control can be passed through
The pole G of P-MOS device processed makes the power ground of equipment and signal ground be maintained at same level, guarantees the original function of circuit.
Compared with prior art, the utility model has the beneficial effects that
The utility model provides a kind of equipment based on car OBD interface and extracts detection circuit, by power supply, resistance,
The setting of diode, P-MOS device and voltage detecting point realizes the detection extracted to equipment, meets all vehicles
Extract decision logic.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Wherein: 1, power supply；2, resistance；3, diode；4, P-MOS device；5, voltage detecting point.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
The utility model is further elaborated below in conjunction with drawings and examples.
Embodiment 1
As shown in Figure 1, the utility model relates to a kind of, the equipment based on car OBD interface extracts detection circuit, including electricity
Source 1, resistance 2, diode 3 and P-MOS device 4；Wherein:
The cathode of the power supply 1 is connect with the pole D of the P-MOS device 4；
The pole D of the P-MOS device 4 is connected in equipment power ground；
The anode of the power supply 1 is connect with described 2 one end of resistance；
2 other end of resistance is connect with the anode of the diode 3；
In the resistance 2 on 3 connecting line of diode, it is provided with voltage detecting point 5；
The cathode of the diode 3 is connect with the pole S of the P-MOS device 4；
The pole S of the P-MOS device 4 is connected to device signal on the ground；
The G of the P-MOS device 4 is extremely hanging.
More specifically, the extraction detection circuit is arranged on OBD interface loop, and the OBD interface loop includes power supply
Interface, equipment power ground interface and device signal ground interface；External equipment by the power interface, equipment power ground interface,
Device signal interface be connected on the OBD interface loop.
More specifically, when external equipment is connect with the OBD interface loop, the 5 voltage V of voltage detecting pointuIt is equal to
The 3 voltage V of dioded1；When external equipment and the OBD interface loop disconnect, the 5 voltage V of voltage detecting pointuIt is equal to
The 2 voltage V of resistancer, that is, it is equal to the 4 voltage V of P-MOS devicep。
In the specific implementation process, when external equipment is connect with the OBD interface loop, the included power supply of external equipment
Power supply 1 in replaceable measurement circuit is resistance 2, the power supply of diode 3；And it is disconnected in external equipment and the OBD interface loop
When, then be resistance 2 by the power supply 1 in detection circuit, diode 3 is powered, and be can be obtained by the value of 5 voltage of voltage detecting point
The equipment of OBD interface extracts state, completes the detection that equipment is extracted.
In the specific implementation process, equipment power ground and device signal are associated together by P-MOS device 4, it can
To make the power ground of equipment and signal ground be maintained at same level, guarantee the original of circuit by the pole G of control P-MOS device
Function.
Obviously, the above embodiments of the present invention is merely examples for clearly illustrating the present invention, and
It is not limitations of the embodiments of the present invention.For those of ordinary skill in the art, in above description
On the basis of can also make other variations or changes in different ways.There is no need and unable to give all embodiments
Exhaustion.Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention etc., should be included in
Within the protection scope of utility model claims.
Claims (3)
1. a kind of equipment based on car OBD interface extracts detection circuit, it is characterised in that: including power supply (1), resistance (2), two
Pole pipe (3) and P-MOS device (4)；Wherein:
The cathode of the power supply (1) is connect with the pole D of the P-MOS device (4)；
The pole D of the P-MOS device (4) is connected in equipment power ground；
The anode of the power supply (1) is connect with the resistance (2) one end；
Resistance (2) other end is connect with the anode of the diode (3)；
On the resistance (2) and the diode (3) connecting line, it is provided with voltage detecting point (5)；
The cathode of the diode (3) is connect with the pole S of the P-MOS device (4)；
The pole S of the P-MOS device (4) is connected to device signal on the ground；
The G of the P-MOS device (4) is extremely hanging.
2. a kind of equipment based on car OBD interface according to claim 1 extracts detection circuit, it is characterised in that: institute
It states and extracts detection circuit setting on OBD interface loop, the OBD interface loop includes power interface, equipment power ground interface
With device signal interface；External equipment by the power interface, equipment power ground interface, device signal interface be connected to
On the OBD interface loop.
3. a kind of equipment based on car OBD interface according to claim 2 extracts detection circuit, it is characterised in that: when
When external equipment is connect with the OBD interface loop, voltage detecting point (5) the voltage VuEqual to the diode (3) voltage
Vd1；When external equipment and the OBD interface loop disconnect, voltage detecting point (5) the voltage VuEqual to the resistance (2) electricity
Press Vr, that is, it is equal to P-MOS device (4) the voltage Vp。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821483731.6U CN208953641U (en) | 2018-09-11 | 2018-09-11 | A kind of equipment extraction detection circuit based on car OBD interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821483731.6U CN208953641U (en) | 2018-09-11 | 2018-09-11 | A kind of equipment extraction detection circuit based on car OBD interface |
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| Publication Number | Publication Date |
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| CN208953641U true CN208953641U (en) | 2019-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821483731.6U Active CN208953641U (en) | 2018-09-11 | 2018-09-11 | A kind of equipment extraction detection circuit based on car OBD interface |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426984A (en) * | 2020-03-12 | 2020-07-17 | 深圳市道通科技股份有限公司 | OBD module disconnection detection method, OBD vehicle-mounted monitoring terminal and OBD monitoring system |
| CN112051463A (en) * | 2020-08-07 | 2020-12-08 | 广州亚美智造科技有限公司 | Vehicle-mounted diagnosis system plug detection circuit and vehicle management system |
-
2018
- 2018-09-11 CN CN201821483731.6U patent/CN208953641U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426984A (en) * | 2020-03-12 | 2020-07-17 | 深圳市道通科技股份有限公司 | OBD module disconnection detection method, OBD vehicle-mounted monitoring terminal and OBD monitoring system |
| WO2021179992A1 (en) * | 2020-03-12 | 2021-09-16 | 深圳市道通科技股份有限公司 | Disconnection detection method for obd module, obd vehicle-mounted monitoring terminal, obd monitoring system |
| CN112051463A (en) * | 2020-08-07 | 2020-12-08 | 广州亚美智造科技有限公司 | Vehicle-mounted diagnosis system plug detection circuit and vehicle management system |
| CN112051463B (en) * | 2020-08-07 | 2023-08-11 | 亚美智联数据科技有限公司 | Plug detection circuit of vehicle-mounted diagnosis system and vehicle management system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221223 Address after: 510630 Room 101, No. 227, Gaotang Road, Tianhe District, Guangzhou City, Guangdong Province (Location: Room 601) (office only) Patentee after: Yamei Zhilian Data Technology Co.,Ltd. Address before: 510630 ABCDEFG, Room 601, No.1 Hanjing Road, Tianhe District, Guangzhou City, Guangdong Province Patentee before: GUANGZHOU YAME INFORMATION TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right |