CN209642687U - T-BOX terminal and CAN network go offline detection device - Google Patents
T-BOX terminal and CAN network go offline detection device Download PDFInfo
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- CN209642687U CN209642687U CN201920448259.0U CN201920448259U CN209642687U CN 209642687 U CN209642687 U CN 209642687U CN 201920448259 U CN201920448259 U CN 201920448259U CN 209642687 U CN209642687 U CN 209642687U
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Abstract
Detection device that the utility model embodiment provides a kind of T-BOX terminal and CAN network goes offline, pass through first switch module, second switch module, microcontroller and the first divider resistance being arranged in T-BOX terminal, realize to T-BOX terminal with checked the reason of CAN main line communication failure in CAN network, and then determine whether T-BOX terminal and CAN main line communication failure are caused by being disconnected as CAN connecting line physical connection, it is provided convenience for the subsequent maintenance process of maintenance personal, keeps the maintenance process of maintenance personal more targeted.
Description
Technical field
The utility model embodiment is related to car networking field of communication technology, more particularly, to T-BOX terminal and CAN net
Network goes offline detection device.
Background technique
With the fast development of technology, car networking system is gradually used widely.Car networking system passes through in vehicle instrument
Table platform is installed vehicle-mounted terminal equipment and is realized to vehicle all situations and quiet, multidate information acquisition, storage and transmission.
Vehicle-mounted terminal equipment is generally T-BOX terminal, and major function is to realize automobile and far-distance communication service provider
The interconnection of (Telematics Service Provider, TSP).CAN under normal running conditions, in T-BOX terminal and vehicle
Network is directly connected to, and by the CAN data in acquisition CAN network, and collected CAN data is uploaded to TSP and are analyzed
Processing.
But in the actual use of T-BOX terminal, T-BOX terminal often occurs and is communicated with CAN main line in CAN network
The phenomenon that failure, this, which will will lead to T-BOX terminal, can not acquire CAN data, study CAN in T-BOX terminal and CAN network at this time
The reason of main line communication failure, is most important, is now badly in need of providing a kind of T-BOX terminal and CAN network goes offline detection device, with true
Whether determine T-BOX terminal with CAN main line communication failure in CAN network is to cause since T-BOX terminal goes offline with CAN main line.
Utility model content
In order to overcome the problems referred above or it at least is partially solved the above problem, the utility model embodiment provides a kind of T-
BOX terminal and CAN network go offline detection device.
Detection device that the utility model embodiment provides a kind of T-BOX terminal and CAN network goes offline, comprising: first opens
Close module, second switch module, microcontroller and the first divider resistance；
The microcontroller is connect with the first switch module and the second switch module respectively, the first switch
Module is connected with the first power supply, and the first switch module is connect with one end of CAN bus in vehicle, the second switch mould
Block is connect with the other end of the CAN bus；
The second switch module is also connect with first divider resistance, the first divider resistance ground connection；
The microcontroller is for controlling the first switch module and second switch module closure, the microcontroller
Device is also used to acquire the voltage at first divider resistance both ends.
Preferably, the T-BOX terminal and CAN network go offline detection device further include: the second divider resistance；
Second divider resistance and first divider resistance are connected in series；
Second divider resistance is connect with the second switch module.
Preferably, the T-BOX terminal and CAN network go offline in detection device, one end of the CAN bus also with
The high output signal line end of CAN chip connects, low-output signal line of the other end of the CAN bus also with the CAN chip
End connection；
The CAN chip is connect with third switch module, and the third switch module is connected with second source, and described
Three switch modules are connect with the microcontroller；
The second source is used to provide normal working voltage for the communication connection of T-BOX terminal and the CAN bus；
The microcontroller is also used to control the third switch module and disconnects.
Preferably, during the T-BOX terminal and CAN network go offline detection device, the third switch module is specially
Metal-oxide-semiconductor.
Preferably, during the T-BOX terminal and CAN network go offline detection device, the resistance of the CAN bus is specially
60Ω。
Preferably, the T-BOX terminal and CAN network go offline in detection device, the first switch module and described
Second switch module is specially metal-oxide-semiconductor.
Preferably, during the T-BOX terminal and CAN network go offline detection device, first power supply is specially 5V electricity
Source.
A kind of T-BOX terminal provided by the embodiment of the utility model and CAN network go offline detection device, by being arranged in T-
First switch module, second switch module, microcontroller and the first divider resistance in BOX terminal, realize to T-BOX terminal with
The reason of CAN main line communication failure, is checked in CAN network, and then determines that T-BOX terminal is with CAN main line communication failure
No is caused by being disconnected as CAN connecting line physical connection, to provide convenience for the subsequent maintenance process of maintenance personal, makes to repair people
The maintenance process of member is more targeted.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is
Some embodiments of the utility model, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of T-BOX terminal provided by the embodiment of the utility model and the go offline structure of detection device of CAN network is shown
It is intended to；
Fig. 2 is a kind of T-BOX terminal provided by the embodiment of the utility model and the go offline structure of detection device of CAN network is shown
It is intended to；
Fig. 3 is a kind of T-BOX terminal provided by the embodiment of the utility model and the go offline structure of detection device of CAN network is shown
It is intended to.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The range of the utility model protection.
As shown in Figure 1, the utility model embodiment provides a kind of T-BOX terminal and CAN network goes offline detection device, packet
It includes: first switch module 1, second switch module 2, microcontroller 3 and the first divider resistance 4.Microcontroller 3 is opened with first respectively
It closes module 1 and second switch module 2 connects, first switch module 1 is connected with the first power supply 5, and first switch module 1 and vehicle
One end of interior CAN bus 6 connects, and second switch module 2 is connect with the other end of CAN bus 6.Second switch module 2 is also with
The connection of one divider resistance 4, the first divider resistance 4 ground connection.Microcontroller 3 is for controlling first switch module 1 and second switch mould
Block 2 is closed, and microcontroller 3 is also used to acquire the voltage at 4 both ends of the first divider resistance.
Specifically, the T-BOX terminal and CAN network provided in the utility model embodiment goes offline in detection device, including
First switch module 1, second switch module 2, microcontroller 3 and the first divider resistance 4, first switch module 1, second switch mould
Block 2, microcontroller 3 and the first divider resistance 4 are arranged in T-BOX terminal.First switch module 1 and second switch module 2
It is used to the on-off of control route.First switch module 1 is controlled by microcontroller 3 and second switch module 2 is closed, by first
Power supply 5, first switch module 1, the CAN bus 6 in vehicle, second switch module 2 and the first divider resistance 4 forming circuit.
Since CAN bus 6 has resistance value, the first divider resistance 4 is divided with CAN bus 6, is acquired at this time by microcontroller 3
The voltage at 4 both ends of the first divider resistance specifically can draw a line at the ungrounded end of the first divider resistance 4 and be connected to microcontroller
Device 3 acquires the potential at the ungrounded end of the first divider resistance 4, the i.e. voltage at 4 both ends of the first divider resistance by microcontroller 3.
At this point, can judge whether T-BOX terminal and CAN bus are in the state of going offline according to the collection result of microcontroller 3.Specifically
Whether the circuit that above-mentioned formation can be judged by the collection result of microcontroller 3 is closure, wherein whether there is breakpoint, if depositing
In breakpoint then between T-BOX terminal and CAN bus in going offline state, illustrate T-BOX terminal and CAN main line communication failure be by
Caused by CAN connecting line physical connection disconnects.Otherwise it is in normal connection status between T-BOX terminal and CAN bus, illustrates T-
BOX terminal and CAN main line communication failure are not caused by being disconnected as CAN connecting line physical connection, but are led by other reasons
It causes.
It should be noted that the resistance value of the first divider resistance can according to need and be set, it is therefore an objective to vehicle end
CAN main line series connection, to be divided with CAN main line.The voltage that the resistance value of first divider resistance can acquire microcontroller
Size has an impact, but will not influence the judgement to the state that goes offline whether is between T-BOX terminal and CAN bus.As
Preferred embodiment, the resistance value of the first divider resistance can be 100k Ω.
Preferably, microcontroller can specifically use single-chip microcontroller.
When the collection result of microcontroller 3 is less than preset voltage value, it is determined that the T-BOX terminal and the CAN bus
In the state of going offline；The preset voltage value is determined by the resistance value of first divider resistance and the resistance value of CAN bus.In advance
If voltage value is the voltage value at the first divider resistance both ends when being in normal connection status between T-BOX terminal and CAN bus.If
The collection result of microcontroller 3 is less than preset voltage value, illustrates that the collected voltage value of microcontroller is smaller, whole lower than T-BOX
Hold the voltage value the first divider resistance both ends when being in normal connection status between CAN bus, it is known that by the first power supply 5, the
The circuit that CAN bus 6, second switch module 2 and the first divider resistance 4 in one switch module 1, vehicle are formed has not been
Complete closure, but there are breakpoints.It can be said that illustrating T- in the state that goes offline between bright T-BOX terminal and CAN bus
The reason of BOX terminal and CAN main line communication failure is as caused by CAN connecting line physical connection poor contact.
When the collection result of microcontroller 3 is not collect voltage value, it is determined that the T-BOX terminal and the CAN are total
Line is in the state that goes offline.This is because when microcontroller does not collect voltage value, it is known that by the first power supply 5, first switch mould
The circuit that CAN bus 6, second switch module 2 and the first divider resistance 4 in block 1, vehicle are formed not is closure, and
It is that there are breakpoints, therefore illustrate that T-BOX terminal is communicated with CAN main line in the state that goes offline between T-BOX terminal and CAN bus
The reason of failure is caused by being disconnected as CAN connecting line physical connection.
When microcontroller 3 collection result be equal to preset voltage value, then known to by the first power supply 5, first switch module 1,
The circuit that CAN bus 6, second switch module 2 and the first divider resistance 4 in vehicle are formed is closure, and breakpoint is not present.
Therefore it is in normal connection status between T-BOX terminal and CAN bus, illustrates the original of T-BOX terminal Yu CAN main line communication failure
Caused by not by the disconnection of CAN connecting line physical connection or poor contact, but as caused by other reasons, such as software work
Make abnormal etc..
The T-BOX terminal that there is provided in the utility model embodiment and CAN network go offline detection device, by being arranged in T-
First switch module, second switch module, microcontroller and the first divider resistance in BOX terminal, realize to T-BOX terminal with
The reason of CAN main line communication failure, is checked in CAN network, and then determines that T-BOX terminal is with CAN main line communication failure
No is caused by being disconnected as CAN connecting line physical connection, to provide convenience for the subsequent maintenance process of maintenance personal, makes to repair people
The maintenance process of member is more targeted.
As shown in Fig. 2, on the basis of the above embodiments, the T-BOX terminal and CAN provided in the utility model embodiment
Net drop detection device, further includes: the second divider resistance 7, the second divider resistance 7 and the first divider resistance 4 are connected in series, and
Second divider resistance 7 is connect with second switch module 2.
Specifically, it in the utility model embodiment, goes offline in T-BOX terminal and CAN network and introduces second in detection device
After divider resistance 7, the voltage for being still 4 both ends of the first divider resistance of microcontroller acquisition, that is, being still will divide from first
The line that the ungrounded end of resistance 4 is drawn is connect with microcontroller 3.
It should be noted that the resistance value of the second divider resistance 7 can according to need and be set, it is therefore an objective to first point
Piezoresistance 4 is connected, then is connected with the CAN main line of vehicle end, by the first divider resistance 4 and the second divider resistance 7 jointly with CAN master
Line is divided.The resistance value of second divider resistance and the first divider resistance can be identical, can not also be identical.Preferably,
The resistance value of second divider resistance can be 100k Ω.First divider resistance and the second divider resistance can acquire microcontroller
Voltage swing have an impact, but will not influence and whether sentence in the state of going offline between T-BOX terminal and CAN bus
It is disconnected.
On the basis of the above embodiments, the T-BOX terminal that provides in the utility model embodiment and CAN network go offline inspection
It surveys in device, the microcontroller is specifically used for:
If judgement knows that the voltage at first divider resistance both ends is less than preset voltage value, it is determined that the T-BOX is whole
End is in the state that goes offline with the CAN bus；
The preset voltage value is determined by first divider resistance.
Specifically, in the utility model embodiment, if the collection result of microcontroller is less than preset voltage value, illustrate micro-control
The collected voltage value of device processed is smaller, divides electricity lower than when being in normal connection status between T-BOX terminal and CAN bus first
Hinder both ends voltage value, it is known that by the first power supply 5, first switch module 1, vehicle CAN bus 6, second switch module 2,
The circuit that first divider resistance 4 and the second divider resistance 7 are formed not is closure, but there are breakpoints.It can be said that
In going offline state between bright T-BOX terminal and CAN bus, the reason of illustrating T-BOX terminal and CAN main line communication failure be by
Caused by CAN connecting line physical connection poor contact.Wherein, preset voltage value by the first divider resistance resistance value, second point
The resistance value of piezoresistance and the resistance value of CAN bus determine jointly.
If the collection result of microcontroller is not collect voltage value, it is determined that the T-BOX terminal and the CAN bus
In the state of going offline.This is because when microcontroller does not collect voltage value, it is known that by the first power supply 5, first switch module
1, the circuit that the CAN bus 6 in vehicle, second switch module 2, the first divider resistance 4 and the second divider resistance 7 are formed is not
Closure, but there are breakpoints, therefore in the state that goes offline between T-BOX terminal and CAN bus, illustrate T-BOX terminal with
The reason of CAN main line communication failure is caused by being disconnected as CAN connecting line physical connection.
If the collection result of microcontroller is equal to preset voltage value, know by the first power supply 5, first switch module 1, vehicle
The circuit that CAN bus 6, second switch module 2, the first divider resistance 4 and the second divider resistance 7 in are formed is closure
, breakpoint is not present.Therefore it is in normal connection status between T-BOX terminal and CAN bus, illustrates T-BOX terminal and CAN master
The reason of line communication failure, is led not as caused by the disconnection of CAN connecting line physical connection or poor contact by other reasons
It causes, such as software work exception etc..
The second divider resistance is introduced in the utility model embodiment and the first divider resistance is divided with CAN main line jointly
Pressure, can suitably reduce the collected voltage value of microcontroller, so that according to the collection result of microcontroller to T-BOX end
Whether the judgement in the state that goes offline is more acurrate between end and CAN bus.
As shown in figure 3, on the basis of the above embodiments, the T-BOX terminal and CAN provided in the utility model embodiment
Net drop detection device, one end of CAN bus 6, i.e., the one end connecting with first switch module 1 are also defeated with the height of CAN chip 8
Out signal line end (H) connect, the other end of CAN bus 6, i.e., the one end being connect with second switch module 2 also with CAN chip 8
Low-output signal line end (L) connection.CAN chip 8 is connect with third switch module 9, and third switch module 9 is connected with second source
10, and third switch module 9 is connect with microcontroller 3.The communication link that second source 10 is used for as T-BOX terminal and CAN bus
Offer normal working voltage is provided.Microcontroller 3 is also used to control the disconnection of third switch module 9.
Specifically, it is illustrated only in Fig. 3 while there is the case where the first divider resistance 4 and the second divider resistance 7, but is right
It is equally applicable in only there are the first divider resistance 4 the case where, this is repeated no more in the utility model embodiment.This is practical new
In type embodiment, T-BOX terminal is provided with second source in T-BOX terminal with when CAN bus normal communication is connect in vehicle
10, third switch module 9 and CAN chip 8, third switch module 9 are used to control the on-off of route.Second source 10, third
Switch module 9 and CAN chip 8 are sequentially connected, and the high output signal line end (H) of CAN chip 8 and one end of CAN bus 6 connect
It connects, the low-output signal line end (L) of CAN chip 8 is connect with the other end of CAN bus 6.CAN bus in T-BOX terminal and vehicle
When normal communication connects, second source 10, third switch module 9, CAN chip 8 and CAN bus 6 constitute closed circuit.Work as T-
In BOX terminal and vehicle when CAN bus communication connection failure, then third switch module 9 is controlled by microcontroller 3 and disconnected, this
When by the first power supply 5, first switch module 1, vehicle CAN bus 6, second switch module 2, the first divider resistance 4 and
Second divider resistance 7 forming circuit, judges that T-BOX terminal is communicated with CAN bus in vehicle by the collection result of microcontroller 3
Whether the reason of connection failure is that T-BOX terminal is in the state of going offline with CAN bus in vehicle and causes.
Wherein, CAN chip 8 specifically can choose the CAN chip of TJA1042 model.
On the basis of the above embodiments, the T-BOX terminal that provides in the utility model embodiment and CAN network go offline inspection
It surveys in device, the third switch module is specially metal-oxide-semiconductor.
Specifically, the third switch module 9 in the utility model embodiment can be metal-oxide-semiconductor, can specifically use
The metal-oxide-semiconductor of AO3415 model.It, can be by the source electrode of metal-oxide-semiconductor and second when accessing circuit as third switch module using metal-oxide-semiconductor
Power supply 10 connects, and the grid of metal-oxide-semiconductor is connect with microcontroller 3, the drain electrode of metal-oxide-semiconductor is connect with CAN chip 8.
On the basis of the above embodiments, the T-BOX terminal that provides in the utility model embodiment and CAN network go offline inspection
It surveys in device, the resistance of CAN bus is specially 60 Ω.
Specifically, it is 120 ohm that two resistance values, which specifically can be used, in the resistance of the CAN bus in the utility model embodiment
Resistor coupled in parallel obtain.
On the basis of the above embodiments, the T-BOX terminal that provides in the utility model embodiment and CAN network go offline inspection
It surveys in device, first switch module 1 and second switch module 2 are specially metal-oxide-semiconductor.
Specifically, the metal-oxide-semiconductor of AO3415 model can be specifically used in the utility model embodiment.Make when using metal-oxide-semiconductor
It, can will be as the source electrode of the metal-oxide-semiconductor of first switch module and the when accessing circuit for first switch module and second switch module
The connection of one power supply 5, will connect with microcontroller 3 as the grid of the metal-oxide-semiconductor of first switch module, will be used as first switch module
The drain electrode of metal-oxide-semiconductor connect with CAN chip 8；It can will be connect as the source electrode of the metal-oxide-semiconductor of second switch module with CAN chip 8,
It will be connect as the grid of the metal-oxide-semiconductor of second switch module with microcontroller 3, by the leakage as the metal-oxide-semiconductor of second switch module
Pole is connect with the first divider resistance or the second divider resistance.
On the basis of the above embodiments, the T-BOX terminal that provides in the utility model embodiment and CAN network go offline inspection
It surveys in device, the first power supply is specially 5V power supply, and second source may be 5V power supply.
It should be noted that microcontroller is to first switch module, second switch module in various embodiments of the utility model
The control function of realization and the acquisition function of realizing to the voltage value at the first divider resistance both ends belong to the normal of microcontroller
Function is advised, those skilled in the art can realize that this is practical new by the control method or acquisition method provided in the prior art
It is not specifically limited in each embodiment of type.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that:
It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is carried out etc.
With replacement；And these are modified or replaceed, various embodiments of the utility model technology that it does not separate the essence of the corresponding technical solution
The spirit and scope of scheme.
Claims (7)
- The detection device 1. a kind of T-BOX terminal and CAN network go offline characterized by comprising first switch module, second open Close module, microcontroller and the first divider resistance；The microcontroller is connect with the first switch module and the second switch module respectively, the first switch module Be connected with the first power supply, and the first switch module is connect with one end of CAN bus in vehicle, the second switch module with The other end of the CAN bus connects；The second switch module is also connect with first divider resistance, the first divider resistance ground connection；The microcontroller is for controlling the first switch module and second switch module closure, and the microcontroller is also For acquiring the voltage at first divider resistance both ends.
- The detection device 2. T-BOX terminal according to claim 1 and CAN network go offline, which is characterized in that further include: the Two divider resistances；Second divider resistance and first divider resistance are connected in series；Second divider resistance is connect with the second switch module.
- The detection device 3. T-BOX terminal according to claim 1 and CAN network go offline, which is characterized in that the CAN is total One end of line is also connect with the high output signal line end of CAN chip, the other end of the CAN bus also with the CAN chip The connection of low-output signal line end；The CAN chip is connect with third switch module, and the third switch module is connected with second source, and the third is opened Module is closed to connect with the microcontroller；The second source is used to provide normal working voltage for the communication connection of T-BOX terminal and the CAN bus；The microcontroller is also used to control the third switch module and disconnects.
- The detection device 4. T-BOX terminal according to claim 3 and CAN network go offline, which is characterized in that the third is opened Closing module is specially metal-oxide-semiconductor.
- 5. T-BOX terminal described in any one of -4 and CAN network go offline detection device according to claim 1, which is characterized in that The resistance value of the CAN bus is specially 60 Ω.
- 6. T-BOX terminal described in any one of -4 and CAN network go offline detection device according to claim 1, which is characterized in that The first switch module and the second switch module are specially metal-oxide-semiconductor.
- 7. T-BOX terminal described in any one of -4 and CAN network go offline detection device according to claim 1, which is characterized in that First power supply is specially 5V power supply.
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| CN201920448259.0U CN209642687U (en) | 2019-04-03 | 2019-04-03 | T-BOX terminal and CAN network go offline detection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111131513A (en) * | 2019-12-31 | 2020-05-08 | 惠州市德赛西威汽车电子股份有限公司 | Vehicle-mounted multimedia connection T-BOX network function detection system and method |
| 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 |
| CN115285042A (en) * | 2022-07-25 | 2022-11-04 | 爱驰汽车有限公司 | Vehicle-mounted communication device and early warning detection method |
-
2019
- 2019-04-03 CN CN201920448259.0U patent/CN209642687U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111131513A (en) * | 2019-12-31 | 2020-05-08 | 惠州市德赛西威汽车电子股份有限公司 | Vehicle-mounted multimedia connection T-BOX network function detection system and method |
| CN111131513B (en) * | 2019-12-31 | 2022-09-16 | 惠州市德赛西威汽车电子股份有限公司 | Vehicle-mounted multimedia connection T-BOX network function detection system and method |
| 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 |
| CN115285042A (en) * | 2022-07-25 | 2022-11-04 | 爱驰汽车有限公司 | Vehicle-mounted communication device and early warning detection method |
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