CN207560031U - The controllable controller of CAN communication circuit terminal resistance - Google Patents
The controllable controller of CAN communication circuit terminal resistance Download PDFInfo
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- CN207560031U CN207560031U CN201721338909.3U CN201721338909U CN207560031U CN 207560031 U CN207560031 U CN 207560031U CN 201721338909 U CN201721338909 U CN 201721338909U CN 207560031 U CN207560031 U CN 207560031U
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- communication
- terminal resistance
- electronic switch
- communication circuit
- controller
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Abstract
The utility model provides a kind of controllable controller of CAN communication circuit terminal resistance, including CAN communication module and corresponding CAN communication circuit, the CAN communication module includes CAN transceiver, terminal resistance and electronic switch, the CAN transceiver is connect with the both ends of CAN communication bus, the terminal resistance is sequentially connected in series at the both ends of the CAN communication bus with the electronic switch and is electrically connected with the CAN transceiver, and the electronic switch controls the terminal resistance to be connected or disconnected with the CAN communication bus.The controller of the utility model has CAN communication terminal resistance configuration feature, can be directed to the unified production of different clients demand, have higher universality, be also equipped with higher reliability in addition.
Description
Technical field
The utility model is related to CAN communication technical field, controllable more particularly to a kind of CAN communication circuit terminal resistance
Controller.
Background technology
The communication mode of various controllers generally uses CAN communication in automobile, needs to have two in CAN communication bus
The CAN communication resistance of 120 Ω is to improve the reliability of communication.Various amount controllers are more in automobile, and different automobile types
Controller arrangement is different, and some need is equipped with the CAN communication resistance of 120 Ω, and the CAN that some does not need to be equipped with 120 Ω leads to
Believe resistance.Controller producer generally require targetedly produced for customer demand or vehicle factor make harness
Shi Zengjia additional circuits carry out impedance matching.
In the prior art, when carrying out specific aim production for different automobile types demand, cost can be improved；And exist for harness factory
Increase circuit in overall wire sheaves and carry out impedance matching, not only improve cost, can also reduce the reliability of communication.
Utility model content
The purpose of this utility model is at least to solve one of drawbacks described above and deficiency, which is by the following technical programs
It realizes.
The utility model provides a kind of controllable controller of CAN communication circuit terminal resistance, including CAN communication module and
Corresponding CAN communication circuit, the CAN communication module include CAN transceiver, terminal resistance and electronic switch, the CAN transmitting-receivings
Device is connect with the both ends of CAN communication bus, and the terminal resistance is sequentially connected in series with the electronic switch in the CAN communication bus
Both ends and be electrically connected with the CAN transceiver, the electronic switch controls the terminal resistance to connect with the CAN communication bus
It connects or disconnects.
In addition, the CAN communication module further includes filter module, the filter module and the terminal resistance and described
Electronic switch is electrically connected, and the filter circuit of the filter module is accessed in the CAN communication circuit.
Further, the electronic switch is electrically connected with external control signal, and the external control signal can control institute
Electronic switch closure is stated, the terminal resistance is accessed in the CAN communication bus.
Further, one or more CAN communication module are provided with.
Further, the electronic switch is one kind in relay, photo-coupler, photoelectrical coupler.
Further, the terminal resistance is 120 Ω terminal resistances.
The advantages of the utility model, is as follows：
(1) controller of the utility model has CAN communication terminal resistance configuration feature, has higher universality.
(2) the controller CAN communication terminal resistance of the utility model is not related to software control, reliably by hardware configuration
Property it is high, configuration is convenient.
(3) during the controller hardware design of the utility model, increased electronic component is few, it is easy to accomplish.
Description of the drawings
By reading the detailed description of hereafter preferred embodiment, it is various other the advantages of and benefit it is common for this field
Technical staff will become clear.Attached drawing is only used for showing the purpose of preferred embodiment, and is not considered as to this practicality
Novel limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.
Fig. 1 is the CAN bus topological diagram that the utility model embodiment provides；
Fig. 2 is the structural representation of the controllable controller of the CAN communication circuit terminal resistance that provides of the utility model embodiment
Figure；
Fig. 3 is the wiring signal of the controllable controller of the CAN communication circuit terminal resistance that provides of the utility model embodiment
Figure；
Fig. 4 is that the specific CAN of the controllable controller of the CAN communication circuit terminal resistance that provides of the utility model embodiment leads to
Believe circuit design schematic diagram；
Fig. 5 is the controller wiring schematic diagram with multiple CAN communication interfaces that the utility model embodiment provides.
1-CAN transceiver 2- terminal resistances
3- electronic switch 301- relays
4- filter module 5- supply voltages
6- diodes
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although this public affairs is shown in attached drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.It is to be able to be best understood from the disclosure, and can be by this public affairs on the contrary, providing these embodiments
The range opened completely is communicated to those skilled in the art.
There is one or more CAN communication bus, as shown in Figure 1, being connected in every CAN communication bus multiple in vehicle
Controller, such as n controllers.To ensure communication reliability, it is desirable that be arranged in the CAN of the controller at CAN communication bus both ends
Communication interface has 120 Ω terminal resistances, and intermediate controller does not need to have 120 Ω terminal resistances.The control of different automobile types
Device arrangement is different, so whether controller needs to have terminal resistance in the presence of uncertain in CAN bus.
The controllable controller of CAN communication circuit terminal resistance provided by the utility model can be determined according to the demand of vehicle
Whether need to access 120 Ω terminal resistances, without individually designed.Fig. 2 shows embodiment according to the present utility model offers
The controllable controller of CAN communication circuit terminal resistance structure diagram.As shown in Fig. 2, this controller includes CAN communication mould
Block and corresponding CAN communication circuit, CAN communication module include CAN transceiver 1, terminal resistance 2 and electronic switch 3.Wherein,
CAN transceiver 1 and the both ends of CAN communication bus communicate to connect, and for sending and receiving CAN message, the master control system of automobile is led to
CAN transceivers 1 are crossed to be communicated with CAN communication bus and the information of each controller can be obtained from CAN communication bus.
Terminal resistance 2 is used for CAN bus impedance matching, to improve communication reliability.For convenience of CAN bus impedance matching,
The terminal resistance 2 that resistance value is 120 Ω is directly arranged in this controller.
Electronic switch 3 is used for the access and disconnection of control terminal resistance 2, and terminal resistance 2 is sequentially connected in series with electronic switch 3
It is electrically connected at the both ends of CAN communication bus, and with CAN transceiver 1.
The CAN communication module of this controller further includes filter module 4, and the both ends of filter module 4 and CAN communication bus are connected
It connects, filter circuit is made to be incorporated in CAN communication circuit, access filter circuit can improve communication reliability.
Electronic switch 3 is controlled by external signal, and when external signal is low level, electronic switch 3 is closed；Work as external signal
For high level or it is hanging when, electronic switch 3 disconnects.
As shown in figure 3, being sent to the external control signal of electronic switch 3, pass through a stitch in controller connector
It draws, the setting of CAN communication terminal resistance can be carried out according to vehicle demand in controller strand design.When vehicle needs to control
When device processed has 120 Ω terminal resistances 2, the control signal wire beam of the electronic switch 3 connects low level (battery terminal negative), electronic cutting
It closes 3 to be closed, terminal resistance 2 is linked into CAN communication bus；When vehicle, which does not need to controller, has 120 Ω terminal resistances 2,
The control signal wire beam of the electronic switch 3 connects high level (battery positive voltage) or hanging, and electronic switch 3 disconnects, terminal resistance 2
It is not linked into CAN communication bus.
Electronic switch 3 can select relay, photo-coupler, photoelectrical coupler etc., with relay 301 in present embodiment
For illustrate.As shown in figure 4, the contact of relay 301 and 120 Ω terminal resistances 2 are serially connected in CAN communication bus CANH
Between CANL, one end of 301 coil of relay is connect with supply voltage 5, and the other end of 301 coil of relay passes through control
Device connector is connect with controller exterior strands.In addition, in 301 coil both ends of a relay diode 6 in parallel, for continuing
Stream.When the harness for signal being controlled to connect with relay 301 connects low level, the contact of relay 301 is attracted, 120 Ω terminals electricity
Resistance 2 is linked into CAN communication bus；When with relay 301 control the harness that connect of signal connect high level or it is hanging when, relay
The contact of device 301 is not attracted, and 120 Ω terminal resistances 2 are not linked into CAN communication bus.
In addition, a controller can be equipped with multiple CAN communication module, in the interface circuit of each CAN communication module
According to this CAN communication circuit design so that each CAN communication module has terminal resistance control function, further improve
The versatility of controller.As shown in figure 5, when controller tool there are two CAN communication modules when, in entire vehicle design, two CAN
Communication module is located in two different CAN bus respectively, i.e., CAN communication module 1 is connected with the interface of CAN bus 1, CAN
Communication module 2 is connected with the interface of CAN bus 2, and the control signal wire beam of the electronic switch of CAN communication module 1 connects low level
(battery terminal negative), the interface of CAN bus 1 need have 120 Ω terminal resistances 2；The control of the electronic switch of CAN communication module 2
Signal harness processed connects high level (battery positive voltage), and the interface of CAN bus 2 does not need to 120 Ω terminal resistances 2.
In specific implementation, when the electronic switch control signal wire Shu Jun of CAN bus 1 and CAN bus 2 connects high level, CAN
The interface of bus 1 and CAN bus 2 does not need to 120 Ω terminal resistances 2, i.e. the controller does not need to have 120 Ω terminals electricity
Resistance.The quantity of CAN communication module is set according to the quantity of CAN communication bus in vehicle.
The utility model proposes it is a kind of have the controllable controller of CAN communication circuit terminal resistance can be according to vehicle factor demand
The configuration of internal CAN communication circuit terminal resistance is carried out, the unified production of different clients demand on the one hand can be directed to, have higher
Universality, on the other hand have higher reliability.In addition, increase an electronic switch, increased electricity in CAN communication circuit
Subcomponent is few, it is easy to accomplish.
The preferable specific embodiment of the above, only the utility model, but the scope of protection of the utility model is not
This is confined to, in the technical scope that any one skilled in the art discloses in the utility model, can be readily occurred in
Change or replacement, should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model should be with
Subject to the scope of the claims.
Claims (6)
1. the controllable controller of a kind of CAN communication circuit terminal resistance, which is characterized in that including CAN communication module and accordingly
CAN communication circuit, the CAN communication module include CAN transceiver, terminal resistance and electronic switch, the CAN transceiver with
The both ends connection of CAN communication bus, the terminal resistance are sequentially connected in series with the electronic switch the two of the CAN communication bus
Hold and simultaneously be electrically connected with the CAN transceiver, the electronic switch control terminal resistance connect with the CAN communication bus or
It disconnects.
2. the controllable controller of CAN communication circuit terminal resistance according to claim 1, which is characterized in that the CAN leads to
Letter module further includes filter module, and the filter module is electrically connected with the terminal resistance and the electronic switch, the filter
The filter circuit of wave module is accessed in the CAN communication circuit.
3. the controllable controller of CAN communication circuit terminal resistance according to claim 1, which is characterized in that the electronics
Switch is electrically connected with external control signal, and the external control signal can control the electronic switch to be closed, by the end
Resistance is held to access in the CAN communication bus.
4. the controllable controller of CAN communication circuit terminal resistance according to claim 1, which is characterized in that be provided with one
A or multiple CAN communication module.
5. the controllable controller of CAN communication circuit terminal resistance according to any one of Claims 1-4, feature
It is, the electronic switch is relay, one kind in photo-coupler, photoelectrical coupler.
6. the controllable controller of CAN communication circuit terminal resistance according to any one of Claims 1-4, feature
It is, the terminal resistance is 120 Ω terminal resistances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721338909.3U CN207560031U (en) | 2017-10-17 | 2017-10-17 | The controllable controller of CAN communication circuit terminal resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721338909.3U CN207560031U (en) | 2017-10-17 | 2017-10-17 | The controllable controller of CAN communication circuit terminal resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207560031U true CN207560031U (en) | 2018-06-29 |
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ID=62674284
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721338909.3U Expired - Fee Related CN207560031U (en) | 2017-10-17 | 2017-10-17 | The controllable controller of CAN communication circuit terminal resistance |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109343396A (en) * | 2018-10-18 | 2019-02-15 | 艾乐德电子（南京）有限公司 | A kind of and machine CAN build-out resistor automatic identification circuit |
| CN113574752A (en) * | 2019-03-15 | 2021-10-29 | 埃伦贝格尔及珀恩斯根有限公司 | Method for operating a power distributor |
| CN114253887A (en) * | 2021-12-20 | 2022-03-29 | 上海同星智能科技有限公司 | Impedance matching adapter, impedance matching system and method |
| CN114361884A (en) * | 2021-12-27 | 2022-04-15 | 西安现代控制技术研究所 | CAN bus terminal resistor automatic matching design method for boxed missile |
| CN115883296A (en) * | 2022-11-30 | 2023-03-31 | 重庆长安汽车股份有限公司 | CAN terminal resistor control method, circuit, electronic equipment and readable storage medium |
-
2017
- 2017-10-17 CN CN201721338909.3U patent/CN207560031U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109343396A (en) * | 2018-10-18 | 2019-02-15 | 艾乐德电子（南京）有限公司 | A kind of and machine CAN build-out resistor automatic identification circuit |
| CN113574752A (en) * | 2019-03-15 | 2021-10-29 | 埃伦贝格尔及珀恩斯根有限公司 | Method for operating a power distributor |
| CN114253887A (en) * | 2021-12-20 | 2022-03-29 | 上海同星智能科技有限公司 | Impedance matching adapter, impedance matching system and method |
| CN114361884A (en) * | 2021-12-27 | 2022-04-15 | 西安现代控制技术研究所 | CAN bus terminal resistor automatic matching design method for boxed missile |
| CN115883296A (en) * | 2022-11-30 | 2023-03-31 | 重庆长安汽车股份有限公司 | CAN terminal resistor control method, circuit, electronic equipment and readable storage medium |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180629 |