CN110301115A - Subscriber station for bus system and the method for the data transmission in bus system - Google Patents
Subscriber station for bus system and the method for the data transmission in bus system Download PDFInfo
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- CN110301115A CN110301115A CN201780086378.XA CN201780086378A CN110301115A CN 110301115 A CN110301115 A CN 110301115A CN 201780086378 A CN201780086378 A CN 201780086378A CN 110301115 A CN110301115 A CN 110301115A
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- Prior art keywords
- subscriber station
- predetermined
- threshold
- bus system
- bus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/4013—Management of data rate on the bus
- H04L12/40136—Nodes adapting their rate to the physical link properties
Abstract
It provides a kind of for bus system (1；2) subscriber station (10) and one kind is in bus system (1；2) method of the data transmission in.The subscriber station (10) includes transmitting/receiving means (12), for passing through bus (40) for message (45；46；47) it is sent to bus system (1；2) other subscriber stations (20；30) and/or receive bus system (1；2) other subscriber stations (20；30) message (45；46；47), wherein the transmitting/receiving means (12) is designed to: differential voltage being reduced to the predetermined second voltage value for being used to carry out data transmission in second time period from the predetermined the first voltage value for being used to carry out data transmission in first time period or is increased to predetermined the first voltage value from predetermined second voltage value again, and will be used to receive message (45 in second time period；46；47) the judgement threshold (125,126) of bit is reduced to predetermined second threshold for carrying out data transmission in second time period from the predetermined first threshold for carrying out data transmission in first time period or is increased to predetermined first threshold from predetermined second threshold again, and wherein the subscriber station (10) is designed to: to send or receive message (45 than data transmission rate higher in first time period in second time period；47).
Description
Technical field
It is transmitted the present invention relates to a kind of subscriber station for bus system and a kind of data in bus system
Method, wherein the agreement for CAN CAN FD is implemented with more lower than common voltage voltage.
Background technique
Such as CAN network is set in the car, in the CAN network, passed by means of CAN and/or CAN FD agreement
Defeated message, as in the ISO-CD-11898-1 currently as CAN protocol specification in CAN FD description.
In the case where CAN, data transmission rate not can be further improved in many cases, because otherwise voltage edge must
It must be selected precipitous, so that electromagnetic radiation more more than the electromagnetic radiation allowed can be generated.Early stage only exists unique length
CAN bus, which connect all control equipment in vehicle.Nowadays, due to the number of user
Mesh is more and there are many shorter CAN bus.Short length of cable leads to better signal-to-noise ratio.
It is more than CAN FD that more and more communications in CAN bus, which are also required to improve data transfer rate,.
Thus, it is considered in terms of applicant: substituting CAN bus system up to the present, use following bus
System, wherein using high voltage (high voltage) the lower electricity for than usual in digital display circuit being commonly 5V or 3.3V
It presses (low voltage).This system with lower voltage is known as LVDS(Low Voltage Digital System
(low-voltage digital display circuit)).
However of problems be: already existing bus system and the LVDS subscriber station based on LVDS system are incompatible.
The LV message of LVDS subscriber station is destroyed by the subscriber station in traditional subscriber station.Thus, in existing standard CAN system, institute
There is existing subscriber station that must all reequip for LVDS system.This spends very high and cost big.
Summary of the invention
Thus, the task of the present invention is provide a kind of subscriber station for bus system and a kind of in bus system
Data transmission method, the subscriber station and method solve the problems, such as to mention before.It should especially provide a kind of for bus
The control device of system and a kind of method for the data transmission in bus system, wherein relative to solution up to the present
Certainly scheme can also further increase the data transmission rate in bus, to make do not have vicious communication to add via bus in this way
Fastly.
The task is solved by the subscriber station for bus system of the feature with claim 1.The subscriber station packet
Transmitting/receiving means is included, for transmitting the message to other subscriber stations of bus system by bus and/or receiving bus system
Other subscriber stations message, wherein the transmitting/receiving means is designed to: by differential voltage from being used in first time period
The predetermined the first voltage value carried out data transmission is reduced to preparatory for what is carried out data transmission in second time period
Determining second voltage value is increased to predetermined the first voltage value from predetermined second voltage value again, and will
Bit for receiving message in second time period judges the threshold from pre- for what is carried out data transmission in first time period
First determining first threshold be reduced to predetermined second threshold for carrying out data transmission in second time period or
From predetermined second threshold it is increased to predetermined first threshold again, and wherein the subscriber station is designed to: the
To send message than data transmission rate higher in first time period in two periods.
Compared with conventional CAN or CAN FD, data transmission rate can be improved four times using the subscriber station.
Another advantage is: standard CAN or standard CAN FD in bus are not interfered in the LV communication executed by subscriber station
Communication, LV communication are lower with the high voltage (high voltage) than usual in digital display circuit commonly for 5V or 3.3V
Voltage (low voltage) Lai Yunhang.LVCAN subscriber station generates difference more smaller than common differential voltage when data are transmitted
Voltage.Differential voltage is small to be obtained prevent these differential voltages by standard CAN subscriber station from being discovered, because these differential voltages are lower than
For the judgement threshold of 1V, i.e., for example, 0.5V or even it is negative.
Advantageously, the LV which is designed so that standard CAN user tolerance is executed by described subscriber station is poor
Component voltage changes and does not send error message.Multiple LV-CAN subscriber stations can be communicated uninterruptedly as a result,.So
And the subscriber station described before is designed so that the subscriber station can be replaced on standard agreement and then same when needed
Sample can exchange information with standard CAN subscriber station.
Therefore, the method and CAN bus system up to the present implemented by described subscriber station are completely compatible.Cause
This, standard CAN subscriber station or standard CAN FD subscriber station can be substituted gradually by LV-CAN user in the bus.
Other advantageous design schemes of the subscriber station illustrate in the dependent claims.
According to one embodiment, which has connecting pin and is designed to: according on the connecting pin
Signal reduce differential voltage and judge threshold or improve differential voltage and to judge threshold.Additionally or alternatively, the transmission/reception
Device can be designed as: analyzing the content of message and reduces differential voltage according to the content of message and judge threshold or mention
High differential voltage and judge threshold.
According to one embodiment, which has the first connecting pin and is designed to: connecting according to first
It connects the signal on end and generates the differential voltage with the predetermined the first voltage value for data transmission；Transmission/the reception
Device has for receiving the second connection end of bit using threshold is judged as follows, which has predetermined first threshold
Value；And the transmitting/receiving means has third connecting pin and is designed to: according to the signal on third connecting pin, producing
The raw differential voltage with the predetermined second voltage value for data transmission；And the transmitting/receiving means has use
In receiving the 4th connecting pin of bit using threshold is judged as follows, which has predetermined second threshold.
According to one embodiment, which also has communication control unit, which is designed to:
Message is sent while filler is inserted at the position for contemplating that filler when the subscriber station of bus system is synchronous in two periods,
And/or wherein the communication control unit or the transmitting/receiving means are designed to: with differential voltage such in first time period
Level and data transmission rate create filler.Additionally or alternatively, communication control unit or transmitting/receiving means can be by
Design are as follows: other than dominant filler, directly create recessive filler in order.
First time period preferably determines which subscriber station at least temporarily gets the common signal channel to bus or bus
Exclusive, Lothrus apterus access period.Second time period, which is preferably the subscriber station, to be had to bus or bus
The period of exclusive, Lothrus apterus the access of common signal channel.
It is envisaged that: the level of differential voltage averagely has value in the range of -1V and 3V.Additionally or alternative
Ground, differential voltage can have in 0.2V≤UDValue in the range of≤1V.
According to a design scheme, which be can be designed as: LV transmission is concurrently modulated to pre-
In the transmission of the first current value first determined.Additionally or alternatively, which can have error counter, the error count
Device is designed to attempt to be interrupted how many times and count to sending, and wherein the transmitting/receiving means is designed to cut
Transmission operation is changed to, wherein differential voltage is switched to predetermined first voltage type, so as to when the error counter
Message is only sent with original level and original data transmissions rate when counter status is more than predetermined value.
The bus system can be CAN bus system or CAN FD bus system.Additionally or alternatively, possible
It is: is disposed at least one reflection in transmitting/receiving means and reduces unit, which reduces two that unit is connected to bus
Between bus core wire, to reduce the reflection in bus system.
The subscriber station described before can be the part of bus system, which further includes following bus, at least two
A subscriber station is connected to each other by the bus, and at least two subscriber station is communicated with each other.In such case
Under, which can also have switch, which connects between at least two subscriber stations in subscriber station, to draw bus
It is divided into big part about the same.
Mentioning before for task is also by according to claim 10 for counting in the bus system described before
It is solved according to the method for transmission.In the case where this method, transmitting/receiving means is used in bus system, for by total
Line transmits the message to other subscriber stations of bus system and/or receives the message of other subscriber stations of bus system, wherein should
Transmitting/receiving means is by differential voltage from the predetermined the first voltage value for being used to carry out data transmission in first time period
It is reduced to predetermined second voltage value for carrying out data transmission in second time period or again from predetermined
Second voltage value is increased to predetermined the first voltage value, and will be used to receive the bit of message in second time period
Judge that threshold is reduced to from the predetermined first threshold for carrying out data transmission in first time period at second
Between the predetermined second threshold that carries out data transmission in section or be increased in advance really from predetermined second threshold again
Fixed first threshold, and wherein the subscriber station is designed to: with more higher than in first time period in second time period
Data transmission rate sends message.
This method provides the advantages of being previously mentioned previously with regards to subscriber station identical advantage.
Before other possible implementations of the invention also the include or below feature described in embodiment
Or the combination of embodiment being not explicitly mentioned.Here, those skilled in the art also will be using single aspect as improvement side
Case or additional project are added to corresponding citation form of the invention.
Detailed description of the invention
Then, the present invention is further described by with reference to attached drawing and according to embodiment.Wherein:
Fig. 1 shows the simplified block diagram of the bus system according to first embodiment；
Fig. 2 shows the figures of the structure for illustrating the message by the subscriber station transmission of the bus system according to first embodiment
Table；
Fig. 3 shows the simplification structure of the transmitting/receiving means of first and third subscriber station according to first embodiment；
It is CAN_H-CAN_L during valid data transmission that Fig. 4, which is shown in the second user station according to first embodiment,
Schematic change procedure of the differential voltage about the time；
It is CAN_H-during valid data transmission that Fig. 5, which is shown according to the first of first embodiment or third subscriber station,
Schematic change procedure of the differential voltage of CAN_L about the time；
It is CAN_H-during valid data transmission that Fig. 6, which is shown according to the first of second embodiment or third subscriber station,
Schematic change procedure of the differential voltage of CAN_L about the time；
It is CAN_H-during valid data transmission that Fig. 7, which is shown according to the first of 3rd embodiment or third subscriber station,
Schematic change procedure of the differential voltage of CAN_L about the time；
It is CAN_H-during valid data transmission that Fig. 8, which is shown according to the first of fourth embodiment and third subscriber station,
Schematic change procedure of the differential voltage of CAN_L about the time；
Fig. 9 shows the simplification structure of the transmitting/receiving means of first and third subscriber station according to the 5th embodiment；And
Figure 10 shows the simplified block diagram of the bus system according to sixth embodiment.
In the drawing, as long as being not stated otherwise, the identical element of identical or function is provided with identical attached drawing
Label.
Specific embodiment
Fig. 1 shows bus system 1, which for example can be CAN bus system, CAN FD bus system etc.
Deng.Bus system 1 can be applied in vehicle, especially motor vehicle, aircraft etc. or in hospital etc..However,
Bus system 1 is not limited to CAN bus system.
In Fig. 1, bus system 1 has multiple subscriber stations 10,20,30, and the subscriber station is connected respectively to first
In the bus 40 of bus core wire 41 and the second bus core wire 42.Bus core wire 41,42 can also be referred to as CAN_H and CAN_L, and
And for the dominant level of coupling input under transmission state.By bus 40, message 45,46,47 can exist in the form of a signal
It is transmitted between each subscriber station 10,20,30.
Additionally, at least two subscriber stations in subscriber station 10,20,30 are subscriber station 10,30, quilt in this embodiment
Designed for than 5V or 3.3V(, this is the common voltage level in digital display circuit habitually in the past) lower level sending or
Receive the data of message or signal form.Message or signal with level more lower than 5V or 3.3V are then also referred to as LV and disappear
Breath, the position of these LV message is also referred to as LV.In subscriber station 10,30, the voltage of signal relative to ground has about 1.2V
Value or differential voltage have in 0.2V≤UDValue in the range of≤1V.Differential voltage usually have 0.2V≤
UDValue in the range of≤1V.
Subscriber station 10,20,30 for example can be the control equipment or display device or sensor of motor vehicle.
As shown in fig. 1, subscriber station 10,30 is respectively provided with communication control unit 11, transmitting/receiving means 12, mistake meter
Number device 15 and reflection reduce unit 16.In at least one subscriber station in subscriber station 10,30, error counter 15 is also possible to
The part of communication control unit 11.The working principle of error counter 15 is described by more detail about Fig. 5.And subscriber station 20
There is communication control unit 11 and transmitting/receiving means 13 according to Fig. 1.The transmitting/receiving means 12 of subscriber station 10,30 and user
20 transmitting/receiving means 13 of standing is directly connected in bus 40, even if this is not shown in Fig. 1.
Communication control unit 11 is for controlling corresponding subscriber station 10,20,30 via bus 40 and being connected to bus 40
Subscriber station 10,20,30 in other subscriber stations communication.Communication control unit 11 can be as conventional CAN controller or CAN
FD controller is implemented like that.Transmitting/receiving means 12 is for sending message 45,47 and also being retouched in more detail below
It states.Transmitting/receiving means 13 can be implemented as conventional CAN transceiver or CAN FD transceiver.
Reducing unit 16 using reflection can inhibit to reflect, and the reflection is due to open bus core wire end, plug connection
Device or fork in bus 40 and formed.Reflection reduce unit 16 be preferably connected to bus 40 two bus core wires 41,
Between 42.Reflection, which reduces unit 16, for example can be designed as Zener diode, which will in position as much as possible
Differential voltage U in bus 40DIt is restricted to minimum 0V and maximum 2V.In order to can equally exist for LV inhibition reflections, voltage
It is limited during LV transmission, is additionally limited to maximum 0.5V or even 0.2V when necessary.Have in transmission original
Before the position of level, 0.5V limitation is improved in time, so that restriction effect is in 2V.However, being restricted to 0.5V or 0.2V firmly can lead
It causes: the normal bit with 2V cannot be transmitted.It takes action to this, so that only when being expected LV transmission, subscriber station 10,
20, voltage is just restricted to maximum 0.5V or 0.2V by the subscriber station as much as possible in 30, but is also only drawn by limitation
The short circuit current that rises is no more than by the electric current of Zener diode under conditions of determining value ability voltage is restricted to maximum
0.5V or 0.2V.If short circuit current is greater than 0.3mA, which is switched to 2V from 0.5V or 0.2V, and whereby
Allow: the normal bit with 2V can be sent.
Such as in Fig. 2 for the CAN-FD frame square for the CAN frame above Fig. 2 and under figure 2 according to message 46 respectively
As illustrated by the voltage U about time t, the CAN communication in bus 40 can substantially be divided into two it is different
Period, i.e., the arbitration phase 451,453 and data field 452, the data field only schematically shown are also claimed in CAN-FD
Make data phase.Compared to traditional CAN, in CAN-FD, at the end of arbitration phase, by the bit of subsequent data phase
Transmission rate is increased to such as 2,4,8Mbps.It is applicable in whereby: small in the bit transfer rate of arbitration phase 451,452 in CAN-FD
In the bit transfer rate in data field 452.In the case where CAN-FD, data field 452 is bright relative to the data field 452 of CAN frame
It is aobvious to shorten.
Determined in arbitration phase 451,453: the one or more subscriber stations 10 of bus system 1 sent at present, 20,
Which subscriber station in 30 at least temporarily obtains exclusive, the access that does not conflict to the bus 40 of bus system 1.It wins
The subscriber station of arbitration transmits the valid data of message 46 in data field 452.
Fig. 3 illustrates in greater detail the connecting pin of transmitting/receiving means 12 and has for counter status 151
The error counter 15 of 7 value.Therefore, in addition to the first connecting pin for sending signal Tx and second for receiving signal Rx
Except connecting pin, transmitting/receiving means 12 also has the connecting pin for bus signals CAN_H and CAN_L, connecting pin LV, should
Connecting pin LV especially input connector.Transmitting/receiving means 12 also has current source 121.
According to the signal on the LV of connecting pin, transmitting/receiving means 12 is switched to LV operation.In LV operation, sends/connect
Current source 121 is reduced to 8.3mA from common 33mA by receiving apparatus 12, to send the LV message 45,47 with LV.This
Outside, especially simultaneously, transmitting/receiving means 12 by be used to receive LV judge threshold from 1V be reduced to voltage limit half,
I.e. such as 0.25V or 0.1V.Transmitting/receiving means 12 is same, is especially simultaneously reduced to voltage limitation preferably from 2V
0.5V or 0.2V.Its process illustrates in fig. 4 to fig. 6.
Fig. 4 shows the differential voltage U during the valid data transmission of standard CAN message 46DSignal level.This
In, in transmitting/receiving means 12,1V is arrived into the setting of judgement threshold 125 for being used to receive bit.Therefore, if differential voltage UD
Signal level standard CAN message 46 valid data transmission during increase more than 1V, then identify bit.
In fig. 4 it is shown that the significant figure of the standard CAN message 46 between two fillers 60 with position duration T1
According to the stage of transmission.Filler 60 is embedded into standard CAN after predetermined time interval by communication control unit 11 and disappears
In breath 46, so as to realize the synchronization of the subscriber station 10,20,30 of bus system 1.
Therefore, in the case where standard CAN or standard CAN FD, judge that threshold 125 is continuously kept 1V.
Different from this, Fig. 5 shows the differential voltage U during the valid data transmission of LV-CAN message 45,47DLetter
Number level.Here, in order to realize the compatibility as well as possible with described existing standard before, even if in LV message
45, in the case where 47, the position with fiduciary level is also transmitted first, as in standard CAN message or standard CAN FD message 46
In the case of like that.Level and whereby LV position 65 of the transmission with position duration T3 are just reduced after arbitrating successfully.In Fig. 5,
Position duration T3 only has the half of the position duration T1 of filler 60 long.LV especially can arbitrate position with persistence criteria and need to transmit
The 1/8 of the time wanted or 1/32.The recessive position LV 1 has the differential voltage lower than 0.25V, and the position subdominance LV 0 is with being greater than
The differential voltage of 0.25V.The position subdominance LV 0 can always be covered by dominant normal bit 0.LV message 45,47 can be in terms of content
It constructs identicallyly as standard CAN or CAN FD message, wherein allowing with the LV message more than 64 bytes, in data portion
The LV position time allow it is shorter than the arbitration position time in header, and can be by one or more normal bits in header come pre-
First notify the transmission to LV.
It does not make mistake so as not to already existing subscriber station in the market, such as identification of subscriber station 20, filler 60 can be with logical
Often expected time interval is embedded in message 45,47 with fiduciary level and full-length.
Optionally, communication control unit 11 or transmitting/receiving means 12 can be designed as: in addition to dominant filler it
Outside, recessive filler is directly created in order.
According to Fig. 5, in transmitting/receiving means 12, after arbitration, expected first in valid data or transmission filling
Position 60, when duration of the filler or position a length of T1, this is equal to the full-length of filler 60.Then, predetermined etc.
After the time T2 of the half of duration T1 expires, 0.25V is arrived into the setting of judgement threshold 121 for being used to receive bit.Therefore, if
Differential voltage UDSignal level the valid data of standard CAN message or standard CAN FD message 46 transmission during increase super
0.25 V is crossed, then signal level is identified as bit.It is receiving the dominant filler 60 with duration T1 and is receiving tool
After having the recessive filler 60A of another duration T1, followed by the valid data position 65 with position duration T3.If received again
Filler 60, then the judgement threshold 121 for being used to receive bit is increased to 1V from 0.25V again by transmitting/receiving means 12, such as in Fig. 5
Illustrated in.In Fig. 5, after the duration T2 after the identification to the second dominant filler 60 starts expires, it will sentence
Disconnected threshold 121, which is switched to, judges threshold 125.
The valid data transmission of LV message 45,47 can be completely simultaneous with the transmission according to CAN protocol or CAN FD agreement
Hold.
Therefore, in the case where the completely compatible LV-CAN according to Fig. 5, subscriber station 10,30 is additionally in valid data
The filler 60 with fiduciary level is sent during transmission at the position desired by standard CAN subscriber station 20.According to being expected
The position LV 65 is still expected in position with original level, the subscriber station 10,30 as LV recipient make to judge threshold 0.25V and 1V it
Between convert.
It is CAN-H's and CAN-L as long as no standard CAN (FD) message is sent when being communicated in bus system 1
Two level are just changed in 2.5V or so.Therefore, differential voltage 0V.Common CAN user, such as subscriber station 20 are when in CAN-H
Differential voltage between CAN-L is more than just to identify the beginning of data transmission the presentation time of certain for example, 1V.
In the case where communication in bus system 1, LVCAN subscriber station 10 first attempts to send the LVCAN subscriber station
The LV message 45 with LV level.If this can not because the LV message 45 by other LV message 47, electromagnetic radiation or
Standard message 46 is destroyed/is dominated, and the trial of subscriber station 10 sends message 45 according to standard agreement.The transmission of LV message 45 is attempted
Time identical with standard message 46 starts after three interframe space (Inter-Frame-Space) positions terminate.
If should the time identical with standard message 46 send LV message 45, sender, be in this example subscriber station 10 most
Evening identifies this point after 6 LV after the transmission to the first recessive filler 60 is attempted, i.e., because of differential voltage
It is not lowered under 0.1V, or because voltage increases more than 1V.Subscriber station 10 as LV sender identifies: user
Stand 20 want send standard messages 46.Because the subscriber station 20 as (standard) sender is always also busy with after 6 LV
First (start frame (Start Of Frame)) normal bit is sent, so subscriber station 10 can be used as LV sender without lingeringly
It attempts the LV message 45 of the subscriber station as standard message 46 or as the message still with standard header with LV content
To send.
Under specific condition, such as extreme temperature, extreme air humidity, short circuit with spark etc., LV data are passed
The defeated possibility short time is disturbed, so that interrupting transmission due to erroneous frame.When LV transmission is interrupted due to erroneous frame, according to
CAN protocol or CAN FD agreement are repeated to be transmitted with original level and original data transmissions rate.
Thus, transmitting/receiving means 12 has error counter 15, as before described in Fig. 3.Mistake meter
Number device 15 counts the number of erroneous frame.If multiple message are all erroneously transmitted in order, so that error count
The counter status 151 of device 15 be more than threshold, then these message only still with original level and original data transmissions rate rather than LV is electric
Gentle LV data transmission rate is sent.Ascertain the number the meter for making error counter 15 without mistakenly transmission/received message
Number device state 151 reduces.If the counter status 151 of error counter 15 is reduced enough to more, re-starts and disappear to LV
The transmission of breath.By the transmission using fiduciary level during this period, although bus load may be increased to can no longer send it is low
The degree of the message of priority.But the message since high priority can also be sent, the urgent operation of the safety of vehicle is can
Can.
Once the CAN user of all standards is substituted by LV user, the arbitrating data with LV level can also be just sent.
If eliminating toggling between level, transmitting/receiving means 12 can more advantageously be built, because can save
Go to the connecting pin LV.But then only also it can be carried out peace by reducing data transmission rate in the case where no level improves
Full urgent operation.
Fig. 6 shows the differential voltage during the valid data transmission of LV-CAN message 45,47 in a second embodiment
UDSignal level.Here, transmitting/receiving means 12 is constructed in a manner of identical with embodiment previous.However,
In current embodiment, the synchronization of the subscriber station 10,20,30 of bus system 1 is not needed.Thus, it does not transmit with original electricity
Flat filler 60.Therefore, transmitting/receiving means 12 can be continuous during the valid data of LV-CAN message 45,47 transmit
Ground connection judges threshold 121, as shown in fig. 6.The signal level of Fig. 6 corresponds to pure LV-CAN, wherein eliminating pair
The transmission of filler 60 with original level and judge that threshold is permanently kept 0.25V.
Therefore, in the case where CAN subscriber station, the CAN subscriber station can be during the duration that valid data transmit not
It needs synchronous or detects LV level, eliminated within valid data with original level for higher data transmission rate
Filler 60.
Fig. 7 shows the differential voltage during the valid data transmission of LV-CAN message 45,47 in the third embodiment
UDSignal level.Here, it carries out transmitting similar data transmission with the data described in Fig. 5.However, in current reality
It applies in example, is worked with+- 0.5V rather than the LV level difference of+0.5V, as illustrated in Fig. 7.Therefrom compared
Bigger voltage rises in the case of fig. 5, is 1V rather than the 0.5V as in the example of hgure 5.
Relative to the level difference of+0.5V, by for 1V rather than the higher voltage of 0.5V rises reduces interference radiation
Influence.However, data transmission rate can be also reduced to 1/1.6th or 1/2.4th simultaneously.
In the modification, it is also envisaged that: it is worked with the LV level difference of+1V.But, the variation
Then no longer with up to the present CAN protocol or CAN FD agreement it is completely compatible.
Fig. 8 shows the differential voltage during the valid data transmission of LV-CAN message 45,47 in the fourth embodiment
UDSignal level.Here, it carries out transmitting similar data transmission with the data described in Fig. 6.However, in current reality
It applies in example, is worked with+- 0.5V rather than the LV level difference of+0.5V, as described earlier in relation to figure 7.Therefrom
It obtains rising for the bigger voltage of 1V, rather than 0.5V, as in the example of fig. 6.
Here, also the same in a modification it is envisaged that: if the shortage obtained in and CAN protocol or
There is no problem in bus system 1 for the compatibility of CAN FD agreement, then is worked with the LV level difference of+1V.
Fig. 9 shows the transmitting/receiving means 120 of the bus system 1 according to the 5th embodiment.Different from previous implementation
Example substitutes a connecting pin LV, and there are two connecting pin, i.e. an input terminal LVR and an outputs for the tool of transmitting/receiving means 120
Hold LVT.Output end LVT shows: have identified normal bit in bus 40, rather than the desired position LV.Only when by defeated
When entering to hold LVR actively to connect LV operation, the limitation of differential voltage is just to effectively switched to maximum 0.5V or 0.2V.In other feelings
Under condition, transmitting/receiving means 120 is constructed in a manner of identical with the transmitting/receiving means 12 according to previous embodiment.
In another design scheme, transmitting/receiving means 120 can have the connecting pin LVRx and use that signal is received for LV
The connecting pin LVTx of signal is sent in LV, it is described to receive the connecting pin LVRx of signal for LV and send the connection of signal for LV
Hold LVTx that can also be referred to as the third and fourth connecting pin of transmitting/receiving means 120.In this way, LV send signal or
Person LV, which receives signal, also can create or be forwarded to the communication control unit by communication control unit 11.
In developing stage later, using for sending LV additional RX input terminals, sending the company of signal for LV
It meets end LVTx and receives the connecting pin LVRx of signal for the additional RX input terminal of the received position LV, for LV, no
Can only interval sent and concurrently modulating LV transmission when necessary or during standard CAN transmission.The modulation can be with
It is carried out like that similar in the case where modulating data on power supply line.
It is possible for concurrently transmitting LV message 45,47 with standard CAN or CAN FD message as a result,.
Figure 10 shows the bus system 2 according to the 5th embodiment.Bus system 2 it is most of with according to first embodiment
Bus system 1 described in as identical mode implement.However, being different from the bus system according to first embodiment
1, bus system 2 additionally has CAN switch 50.CAN switch 50 is preferably embedded in the centre of bus 40, thus generates two
Separated bus 40.
On the one hand, CAN switch 50 has the advantages that only forwarding message 45,46,47, these message are for bus system 2
Corresponding other parts for be interested.Bus load additionally reduces as a result, this is transmitted due to the data of less interruption
The speed attempted and transmit the data in bus system 2 is further increased relative to the bus system 1 of first embodiment.
On the other hand, CAN switch 50 has the advantages that it is considered that LV signal is very weak and therefore vulnerable to electromagnetism spoke
The interference penetrated.Thus, LV message is in the bus system 2 with subscriber station 10,20,30 far away in unfavorable environment or fortune
It is usually destroyed under row state.In order to limit radiation, bus length can be reduced by using CAN switch 50.
The bus system 1,2 of described embodiment can be done in terms of needing higher and higher data transmission rate before
It contributes out, this is driven by becoming the flashing of higher and higher program state in the shortest possible time.The flashing can be with
For example continue for video camera 2.5 hours in the case where standard CAN and longer time.It is desirable that a large amount of customers
It is cut off during flashing and electromagnetic radiation source is turned off whereby.Partly, make control equipment or the user of bus system 1,2
It stands also in the external special website flashing of vehicle.Here shorter and shielded cable can be used, it is possible thereby to by spoke
It penetrates and is reduced to minimum value.
Bus system 1,2, subscriber station 10,20,30 and this method it is all before the design schemes that describe can be single
Ground is used with all possible combination.Especially, all features and/or their modification of the embodiment described before
Arbitrarily it can combine or leave out.Additionally, especially it is contemplated that following modification.
The bus system 1,2 according to these embodiments described before is according to total linear system based on CAN or CAN FD agreement
System is to describe.However, the bus system 1,2 according to different embodiments is also possible to other types of communication network.Advantageous,
It is right rather than enforceable on condition that, at least ensure subscriber station 10,20,30 in determining time interval in bus system 1
Exclusive, Lothrus apterus access to the common signal channel of bus 40 or bus 40.
For alternative in previous embodiment, LV sender can be by being more than the difference between 0.1V or 0.25V and 1V
Component voltage threshold and identify that subdominance LV are covered by dominant normal bit earlier.
Alternative can also execute arbitration in previous embodiment so that when never being succeeded according to the arbitration of new method and
When being reset to model arbitration, it is just converted to big differential voltage.
Alternative is in previous embodiment, if due to previous conflict/mistake it is expected that having fiduciary level
Limitation then can be increased to 2V from 0.2V or 0.5V by the transmission of message.
According to these embodiments bus system 1,2 especially CAN network or CAN FD network or Flex Ray network or
SPI network.
However it is also contemplated that: a bus core wire in two bus core wires 41,42 is grounded and is therefore ground connection
Core wire and another bus core wire in this two bus core wire 41,42 is signal core line, transmit message on the signal core line
45,46,47 bus signals.
The number and layout of subscriber station 10,20,30 in the bus system 1,2 according to these embodiments are arbitrary.
Especially, subscriber station 10 or subscriber station 30 can also be only existed in the bus system of these embodiments 1,2.
The function of the embodiment described before can not only be realized in transmitting/receiving means 12.Additionally or alternative
Ground, the function can be integrated into existing product.It is particularly likely to: the function that is considered or in transmission/reception dress
It sets in 12 and realizes or be embedded in integrated conceptual solutions as individual electronic module (chip), it is integrated total at this
Only one electronic module (chip) in the case where body solution.
Claims (10)
1. one kind is used for bus system (1；2) subscriber station (10), the subscriber station have
Transmitting/receiving means (12；120), for passing through bus (40) for message (45；46；47) it is sent to the bus system
(1；2) other subscriber stations (20；30) and/or the bus system (1 is received；2) message (45 of other subscriber stations；46；
47),
The wherein transmitting/receiving means (12；120) it is designed to: by differential voltage from being used to carry out in first time period
The predetermined the first voltage value of data transmission is reduced to be predefined for what is carried out data transmission in second time period
Second voltage value or be increased to the predetermined the first voltage value from the predetermined second voltage value again, and
And it will be used to receive the message (45 in second time period；46；47) the judgement threshold (125,126) of bit is from for the
The predetermined first threshold carried out data transmission in one period is reduced to for carrying out data biography in second time period
Defeated predetermined second threshold is increased to described predetermined first from the predetermined second threshold again
Threshold value, and
Wherein the subscriber station (10) is designed to: to transmit than data higher in first time period in second time period
Rate sends or receives message (45；47).
2. subscriber station (10) according to claim 1,
The wherein transmitting/receiving means (12；120) there is connecting pin (LV), and the wherein transmitting/receiving means (12；
120) it is designed to: the differential voltage and the judgement threshold or raising is reduced according to the signal on the connecting pin (LV)
The differential voltage and the judgement threshold, and/or
The wherein transmitting/receiving means (12；120) it is designed to: analyzing the content of message (45) and according to the message
(45) content come reduce the differential voltage and the judgement threshold or improve the differential voltage and the judgement threshold (125,
126).
3. subscriber station (10) according to claim 1 or 2,
The wherein transmitting/receiving means (12；120)
It with the first connecting pin (Tx) and is designed to: being had according to the signal generation on first connecting pin (Tx)
The differential voltage of predetermined the first voltage value for data transmission；
Have for receiving the second connection end (Rx) of bit, the judgement threshold tool using threshold (125,126) is judged as follows
There is the predetermined first threshold；And
Have third connecting pin (LVTx) and be designed to: according to the signal on the third connecting pin, generation has
The differential voltage of predetermined second voltage value for data transmission；And
Have for receiving the 4th connecting pin (LVRx) of bit, the judgement threshold using threshold (125,126) is judged as follows
With the predetermined second threshold.
4. subscriber station (10) according to one of the above claims,
The subscriber station also has communication control unit (11), and the communication control unit is designed to: in second time period
In the bus system (1；2) subscriber station (10,20,30) is contemplated that when synchronous and is filled out described in insertion at the position of filler (60)
Send message (45 with filling position (60)；47), and/or
Wherein the communication control unit (11) is designed to: being passed with differential voltage levels such in first time period and data
Defeated rate creates the filler (60), and/or
The wherein communication control unit (11) or the transmitting/receiving means (12；120) it is designed to: in addition to dominant filling
Except position, recessive filler is directly created in order.
5. subscriber station (10) according to one of the above claims,
Wherein the first time period be which determining subscriber station (10,20,30) at least temporarily get to the bus (40) or
The period of exclusive, Lothrus apterus the access of the common signal channel of bus described in person (40), and
Wherein the second time period be the subscriber station (10) have the bus (40) or the bus (40) are total to
The period of exclusive, Lothrus apterus the access of cochannel.
6. subscriber station (10) according to one of the above claims,
Wherein the level of the differential voltage averagely has value in the range of 1V and 3V, and/or
Wherein the differential voltage has in 0.2V≤UDValue in the range of≤1V.
7. subscriber station (10) according to one of the above claims,
The wherein transmitting/receiving means (12；120) it is designed to: LV transmission is concurrently modulated to predetermined the
In the transmission of one current value, and/or
Wherein the subscriber station (10) has error counter (15), and the error counter is designed to attempt quilt to transmission
It interrupts how many times to be counted, and the wherein transmitting/receiving means (12；120) it is designed to be switched to transmission operation,
Described in differential voltage be switched to the predetermined the first voltage value, so as to work as the error counter (15) counting
Message (46) are only sent with original level and original data transmissions rate when device state (151) is more than predetermined value.
8. one kind is used for the subscriber station (10) of bus system (1),
Wherein the bus system (1) is CAN bus system or CAN FD bus system, and/or
Wherein in the transmitting/receiving means (12；120) it is disposed at least one reflection in and reduces unit (16), the reflection
It reduces unit to be connected between two bus core wires (41,42) of the bus (40), to reduce in the bus system (1)
Reflection.
9. a kind of bus system (1), the bus system include
Bus (40)；With
At least two subscriber stations (10,20,30) according to one of the above claims, the subscriber station passes through the bus
(40) it is connected to each other, the subscriber station is communicated with each other.
10. method of the one kind for the data transmission in bus system (1) uses transmitting/receiving means in the method
(12；120) come message (45 through bus (40)；46；47) it is sent to bus system (1；2) other subscriber stations (20；30)
And/or receive bus system (1；2) other subscriber stations (20；30) message (45；46；47), wherein the transmission/reception dress
Set (12；120) differential voltage is dropped from the predetermined the first voltage value for being used to carry out data transmission in first time period
As low as the predetermined second voltage value for carrying out data transmission in second time period or again from predetermined
Two voltage values are increased to predetermined the first voltage value, and will be used to receive message (45 in second time period；46；47)
Bit judgement threshold (125,126) from for carrying out data transmission in first time period predetermined first threshold drop
As low as the predetermined second threshold for carrying out data transmission in second time period or again from predetermined second
Threshold value is increased to predetermined first threshold, and wherein subscriber station (10) is designed to: in second time period with than
Higher data transmission rate sends or receives message (45 in first time period；47).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102016224961.4A DE102016224961A1 (en) | 2016-12-14 | 2016-12-14 | Subscriber station for a bus system and method for data transmission in a bus system |
| DE102016224961.4 | 2016-12-14 | ||
| PCT/EP2017/081670 WO2018108666A1 (en) | 2016-12-14 | 2017-12-06 | Subscriber station for a bus system and method for data transmission in a bus system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110301115A true CN110301115A (en) | 2019-10-01 |
| CN110301115B CN110301115B (en) | 2021-12-21 |
Family
ID=60627632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780086378.XA Active CN110301115B (en) | 2016-12-14 | 2017-12-06 | Subscriber station for a bus system and method for data transmission in a bus system |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP3556058A1 (en) |
| KR (1) | KR20190103202A (en) |
| CN (1) | CN110301115B (en) |
| DE (1) | DE102016224961A1 (en) |
| WO (1) | WO2018108666A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018214967A1 (en) * | 2018-09-04 | 2020-03-05 | Robert Bosch Gmbh | Subscriber station for a serial bus system and method for transmitting data in a serial bus system |
| DE102018221680A1 (en) * | 2018-12-13 | 2020-06-18 | Robert Bosch Gmbh | Device for a subscriber station of a serial bus system and method for communication in a serial bus system |
| DE102019213926A1 (en) * | 2019-09-12 | 2021-03-18 | Robert Bosch Gmbh | Device for a subscriber station of a serial bus system and method for communication in a serial bus system |
| DE102020205257A1 (en) * | 2020-04-24 | 2021-10-28 | Robert Bosch Gesellschaft mit beschränkter Haftung | Communication control device and transmitting / receiving device for a subscriber station of a serial bus system and method for communication in a serial bus system |
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| DE102013222790A1 (en) * | 2013-11-08 | 2015-05-13 | Robert Bosch Gmbh | Subscriber station for a bus system and method for improving the reception quality in a bus system |
| DE102015205670A1 (en) * | 2015-03-30 | 2016-06-09 | Volkswagen Aktiengesellschaft | Attack detection method, attack detection device and bus system for a motor vehicle |
-
2016
- 2016-12-14 DE DE102016224961.4A patent/DE102016224961A1/en active Pending
-
2017
- 2017-12-06 WO PCT/EP2017/081670 patent/WO2018108666A1/en unknown
- 2017-12-06 CN CN201780086378.XA patent/CN110301115B/en active Active
- 2017-12-06 EP EP17811285.0A patent/EP3556058A1/en not_active Withdrawn
- 2017-12-06 KR KR1020197020580A patent/KR20190103202A/en not_active Application Discontinuation
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873108A (en) * | 2009-04-21 | 2010-10-27 | 上海线友电子有限公司 | Terminal resistor automatic match circuit in gas detector |
| CN201769766U (en) * | 2010-08-06 | 2011-03-23 | 浙江吉利汽车研究院有限公司 | CAN (Controller Area Network) bus control system for new energy automobile |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP3556058A1 (en) | 2019-10-23 |
| CN110301115B (en) | 2021-12-21 |
| WO2018108666A1 (en) | 2018-06-21 |
| DE102016224961A1 (en) | 2018-06-14 |
| KR20190103202A (en) | 2019-09-04 |
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