CN106487419B - A kind of multinode terminal resistance compartment system and method based on CANFD bus - Google Patents
A kind of multinode terminal resistance compartment system and method based on CANFD bus Download PDFInfo
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- CN106487419B CN106487419B CN201611013828.6A CN201611013828A CN106487419B CN 106487419 B CN106487419 B CN 106487419B CN 201611013828 A CN201611013828 A CN 201611013828A CN 106487419 B CN106487419 B CN 106487419B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
- H04B3/16—Control of transmission; Equalising characterised by the negative-impedance network used
- H04B3/18—Control of transmission; Equalising characterised by the negative-impedance network used wherein the network comprises semiconductor devices
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Abstract
The present invention relates to a kind of multinode terminal resistance compartment systems and method based on CANFD bus, the system includes: the terminal node sequentially connected by CANFD bus and one or more intermediate nodes, wherein, the terminal node is located at one end of CANFD bus；The terminal node includes the former terminal resistance being connected across between the high position data line CANFD_H of the CANFD bus and low data line CANFD_L；Standby terminal resistance is provided in each intermediate node；The terminal node detects when can not communicate with node every other in bus, disconnects the connection of the former terminal resistance and CANFD bus；The intermediate node adjacent with the terminal node detects when can not communicate with the terminal node, it controls its internal standby terminal resistance to be connected across between the high position data line CANFD_H of the CANFD bus and low data line CANFD_L, so that vehicle CANFD bus keeps normal communication.Through the invention, the reliability of CANFD bus system is improved.
Description
Technical field
The present invention relates to technical field of automotive electronics, in particular to a kind of multinode terminal resistance based on CANFD bus
Compartment system and method.
Background technique
With the fast development of the industries such as electronics, semiconductor, communication, the intelligentized demand of automotive electronics is also increasingly stronger,
Consumer wishes drive propulsion, comfort, economy and the stronger automobile of entertainment.Vehicle factor is in order to improve product competition
More and more electronic control systems are added in automobile control by power, such as ESP (Electronic Stability
Program, electronic stability program), PEPS (Passive Entry Passive Start, keyless entry and activation system),
EPS (Electronic Power Steering, electronic power assist steering), SRS (electronic control of safety
Airbag, electronic security(ELSEC) air bag) etc., the electronic control unit on these vehicles is to realize signal communication by CANFD bus mode
's.However at present CANFD bus system from design principle for be required to carry two terminal nodes, once terminal node lose
Effect is lost, and bus system will be destroyed.
Terminal resistance is provided with inside terminal node, the effect of terminal resistance is exactly to eliminate the letter in communication cable
Number reflection leads to signal reflex there are two types of reason: impedance discontinuity and impedance mismatch in communication process.
Impedance discontinuity: signal suddenly encounters cable resistance very little even without so as to cause signal in line end
Reflection, the principle of this signal reflex, entering another medium from a kind of medium with light will cause reflection to be similar；Eliminate this
The method of kind reflection just must bridge an equal amount of terminal electricity of characteristic impedance with cable in one end of communication cable
Resistance, keeps the impedance of cable continuous.Due to transmission of the signal on cable be it is two-way, in the other end of communication cable
An an equal amount of terminal resistance need to be bridged.
Impedance mismatch: refer to the impedance mismatch between data collector and transmission cable.As a result of which caused
Signal reflex, when being mainly manifested in communication line and being in idle mode, whole network data corruption.
In order to improve the topological ability of network node, CANFD bus both ends need to be connected to the inhibition signal reflex of 120 Ω
Terminal resistance, it plays very important effect to matching bus impedance, if ignoring this resistance, can make the anti-dry of digital communication
Immunity and reliability substantially reduce, or even can not communicate.
Existing CANFD bus system is also only provided with terminal resistance inside terminal node, once terminal node fails
Or lose, bus system will be destroyed, and such vehicle CANFD communication will paralyse, and seriously affect the life wealth of driver and passenger
Produce safety.
Summary of the invention
The present invention provides a kind of multinode terminal resistance compartment systems and method based on CANFD bus, to improve
The reliability of CANFD bus system.
To achieve the goals above, the present invention provides the following technical scheme that
A kind of multinode terminal resistance compartment system based on CANFD bus, comprising: be sequentially connected to CANFD bus
Terminal node and one or more intermediate nodes, wherein the terminal node is located at one end of CANFD bus；
The terminal node includes the high position data line CANFD_H and low data line for being connected across the CANFD bus
Former terminal resistance between CANFD_L；Standby terminal resistance is provided in each intermediate node；
The terminal node detects when can not communicate with node every other in CANFD bus, disconnects described former whole
Hold the connection of resistance and CANFD bus；The intermediate node adjacent with the terminal node is detected can not with the terminal node
When communication, high position data line CANFD_H and low data that its internal standby terminal resistance is connected across the CANFD bus are controlled
Between line CANFD_L, so that vehicle CANFD bus keeps normal communication.
Preferably, detected with the non-conterminous intermediate node of the terminal node with the terminal node and with the end
When all intermediate nodes between end node can not communicate, controlling its internal standby terminal resistance, to be connected across the CANFD total
Between the high position data line CANFD_H and low data line CANFD_L of line.
Preferably, the terminal node includes: the first CANFD bus transceiver, the first central controller, first voltage control
Coremaking piece, first resistor, the first triode and the second triode；The base stage difference of first triode, the second triode
With the first voltage control chip connect, first triode, the second triode collector with the first CANFD
Bus transceiver connection；The first resistor is connected to the emitter and the first CANFD bus transceiver of first triode
Between, the former terminal resistance is connected between the emitter and the first CANFD bus transceiver of second triode；It is described
First CANFD bus transceiver receives or sends CANFD bus signals；First central controller is according to described first
First voltage described in the received CANFD bus signal control of CANFD bus transceiver controls chip, so that the first voltage control
The on-off of first triode described in chip controls processed or second triode, thus the open or closed former terminal resistance with
The connection of CANFD bus.
Preferably, the resistance value of the former terminal resistance is 120 ohm.
Preferably, the intermediate node includes: the 2nd CANFD bus transceiver, the second central controller, second voltage control
Coremaking piece, third transistor, second resistance, 3rd resistor；The second resistance is in parallel with the 3rd resistor as described standby
Terminal resistance；Second central controller controls chip with the 2nd CANFD bus transceiver, the second voltage respectively
Connection；The second resistance is connect with the 2nd CANFD bus transceiver, and the second resistance is connected to the third
Between the collector and 3rd resistor one end of triode, the emitter of the third transistor and the 3rd resistor other end connect
It connects, the base stage of the third transistor is connect with second voltage control chip；The 2nd CANFD bus transceiver receives
Or send CANFD bus signals；Second central controller is according to the received CANFD of the 2nd CANFD bus transceiver
Second voltage described in bus signal control controls chip, so that third transistor described in second voltage control chip controls is logical
It is disconnected, so that controlling the standby terminal resistance is connected across or disconnects high position data line CANFD_H and low level in the CANFD bus
Between data line CANFD_L.
Preferably, the second resistance is identical as the resistance value of the first resistor.
Preferably, the resistance value of the first resistor is between 2000 ohm~5000 ohm.
A kind of multinode terminal resistance location mode based on CANFD bus, which comprises
Setting is connected across the high position data line of the CANFD bus in the terminal node for being located at CANFD bus one end
Former terminal resistance between CANFD_H and low data line CANFD_L；
Standby terminal is set in the one or more intermediate nodes sequentially connecting with the terminal node by CANFD bus
Resistance；
The terminal node is communicated with other nodes in CANFD bus, and is being detected and other all sections in bus
When point can not communicate, the connection of the former terminal resistance and CANFD bus is disconnected；
The intermediate node adjacent with the terminal node is communicated with the terminal node, and can not detect the end
When end node, high position data line CANFD_H and lower-order digit that its internal standby terminal resistance is connected across the CANFD bus are controlled
According between line CANFD_L, so that vehicle CANFD bus keeps normal communication.
Preferably, the method also includes:
It communicates, and is detecting with the non-conterminous intermediate node of the terminal node with all nodes in CANFD bus
When can not communicate to all intermediate nodes with the terminal node and between the terminal node, its inside is controlled
Standby terminal resistance is connected across between the high position data line CANFD_H of the CANFD bus and low data line CANFD_L.
Preferably, the resistance value of the former terminal resistance is 120 ohm.
The beneficial effects of the present invention are:
Multinode terminal resistance compartment system and method provided in an embodiment of the present invention based on CANFD bus, sequentially connects
It is connected to the terminal node and one or more intermediate nodes of CANFD bus, wherein the terminal node is located at CANFD bus
One end；The terminal node includes the high position data line CANFD_H and low data line for being connected across the CANFD bus
Former terminal resistance between CANFD_L；Standby terminal resistance is provided in each intermediate node；The terminal node detect with
When every other node can not communicate in CANFD bus, the connection of the former terminal resistance and CANFD bus is disconnected；With institute
It states the adjacent intermediate node of terminal node to detect when can not communicate with the terminal node, controls its internal standby terminal resistance
It is connected across between the high position data line CANFD_H of the CANFD bus and low data line CANFD_L, so that vehicle CANFD is total
Line keeps normal communication.Through the invention, when the terminal resistance of two terminal nodes of CANFD bus is lost or fails, pass through
The intermediate node controlling terminal resistance adjacent with terminal node accesses CANFD bus, and CANFD bus is made to keep normal communication,
To improve the reliability of CANFD bus system.
Detailed description of the invention
Fig. 1 is a kind of structure chart of multinode terminal resistance compartment system of the embodiment of the present invention based on CANFD bus.
Fig. 2 is another structure chart of multinode terminal resistance compartment system of the embodiment of the present invention based on CANFD bus.
Fig. 3 is the internal structure chart of terminal node in the embodiment of the present invention.
Fig. 4 is the internal structure chart of intermediate node in the embodiment of the present invention.
Fig. 5 is a kind of flow chart of multinode terminal resistance location mode of the embodiment of the present invention based on CANFD bus.
It is attached marked in the figure:
ZR, former terminal resistance BR, standby terminal resistance 1, first resistor Q1, the first triode Q2, the second triode
Q3, third transistor R2, second resistance R3,3rd resistor terminal node (ECU1, ECUA) intermediate node (ECU2 ...
ECU8、ECUB、…ECUH)
Specific embodiment
In order to enable those skilled in the art to be further understood that feature and technology contents of the invention, with reference to the accompanying drawing
It elaborates with embodiment to the embodiment of the present invention.
As shown in Figure 1, being a kind of knot of multinode terminal resistance compartment system of the embodiment of the present invention based on CANFD bus
Composition, comprising: be sequentially connected to the terminal node and one or more intermediate nodes of CANFD bus, wherein the terminal
Node is located at one end of CANFD bus；The terminal node includes the high position data line CANFD_ for being connected across the CANFD bus
Former terminal resistance ZR between H and low data line CANFD_L；Standby terminal resistance BR is provided in each intermediate node；It is described
Terminal node detects when can not communicate with node every other in CANFD bus, disconnect the former terminal resistance ZR with
The connection of CANFD bus；The intermediate node adjacent with the terminal node detects when can not communicate with the terminal node, controls
Make high position data line CANFD_H and low data line that its internal standby terminal resistance BR is connected across the CANFD bus
Between CANFD_L, so that vehicle CANFD bus keeps normal communication.
Further, detected with the non-conterminous intermediate node of the terminal node with the terminal node and with the end
When all intermediate nodes between end node can not communicate, controls its internal standby terminal resistance BR and be connected across the CANFD
Between the high position data line CANFD_H and low data line CANFD_L of bus.
It should be noted that as shown in Fig. 2, due to CANFD bus have both ends, CANFD bus shown in Fig. 2
Terminal node include: ECU1 and ECUA, intermediate node include: ECU3 ... ECU8, ECUC ... ECUH；Certainly, intermediate node
There can be one or more, be not limited to the number of intermediate node shown in Fig. 2.Further, in CANFD bus, can pass through
System setting, by ECU3 ... ECU8 be set as with the non-conterminous intermediate node of ECU1, by ECU3 ... ECU8 detect terminal node
Whether ECU1 can not communicate；By ECUC ... ECUH be set as with the non-conterminous intermediate node of ECUA, by ECUC ... ECUH detect
Whether terminal node ECUA can not communicate.
Specifically, as shown in figure 3, the terminal node ECUA (or terminal node ECU1) includes: that the first CANFD bus is received
Send out device, the first central controller, first voltage control chip, first resistor R1, the first triode Q1 and the second triode Q2；
The first triode Q1, the second triode Q2 base stage respectively with the first voltage control chip connect, the described 1st
Pole pipe Q1, the second triode Q2 collector connect with the first CANFD bus transceiver；The first resistor R1 connection
Between the emitter and the first CANFD bus transceiver of the first triode Q1, the former terminal resistance ZR is connected to institute
It states between the emitter and the first CANFD bus transceiver of the second triode Q2；The first CANFD bus transceiver receive or
Send CANFD bus signals；First central controller is total according to the received CANFD of the first CANFD bus transceiver
Line signal controls the first voltage and controls chip so that the first triode Q1 described in first voltage control chip controls or
The on-off of the second triode Q2, to be connected between open or closed former terminal resistance ZR and the CANFD bus.
Specifically, the first central controller passes through other nodes on the first CANFD bus transceiver and CANFD bus
Communication, and according to the detection of the first CANFD bus transceiver received CANFD bus signals and other all nodes in bus whether
Can not communicate, if so, the first central controller by the first voltage control chip disconnect the former terminal resistance with
The connection of CANFD bus；Otherwise, the first central controller controls chip by the first voltage and connects the former terminal resistance
With the connection of CANFD bus.
It should be noted that the collector of the first triode Q1, the second triode Q2 are total with the first CANFD
The CANFD_L line of the CANFD bus of line transceiver connects；The first resistor R1 is connected to the transmitting of the first triode Q1
Between the CANFD_H line of the CANFD bus of pole and the first CANFD bus transceiver, the terminal resistance ZR is connected to described
Between the CANFD_H line of the CANFD bus of the emitter and the first CANFD bus transceiver of two triode Q2.
Further, the resistance value of the former terminal resistance is 120 ohm.
Specifically, as shown in figure 4, the intermediate node (ECU2 ... ECU8, ECUB ... ECUH) include: the 2nd CANFD
Bus transceiver, the second central controller, second voltage control chip, third transistor Q3, second resistance R2,3rd resistor
R3；The second resistance R2 is in parallel with the 3rd resistor R3 as the standby terminal resistance BR；Second center control
Device is connect with the 2nd CANFD bus transceiver, second voltage control chip respectively；The second resistance R2 with it is described
The connection of 2nd CANFD bus transceiver, and the second resistance R2 connects the collector and third of the third transistor Q3
Between the one end resistance R3, the emitter of the third transistor Q3 is connect with the 3rd resistor R3 other end, and the described 3rd 3
The base stage of pole pipe Q3 is connect with second voltage control chip；The 2nd CANFD bus transceiver receives or sends CANFD
Bus signals；Second central controller is according to the received CANFD bus signal control of the 2nd CANFD bus transceiver
The second voltage controls chip, so that third transistor Q3 on-off described in second voltage control chip controls, to control
It prepares terminal resistance BR and is connected across or disconnects high position data line CANFD_H and low data line in the CANFD bus
Between CANFD_L.
Specifically, the second central controller passes through other nodes on the 2nd CANFD bus transceiver and CANFD bus
Communicate (other nodes include terminal node), and according to the detection of the 2nd CANFD bus transceiver received CANFD bus signals with
Whether terminal node and all intermediate nodes between the terminal node can not communicate in bus, if so, second
Central controller is connected across the high position data of the CANFD bus by second voltage control chip controls for terminal resistance
Between line CANFD_H and low data line CANFD_L；Otherwise, the second central controller controls chip by the second voltage
Standby terminal resistance is controlled to disconnect between the high position data line CANFD_H and low data line CANFD_L of the CANFD bus.
It should be noted that the CANFD of the collector of the third transistor Q3 and the 2nd CANFD bus transceiver
The CANFD_H line of bus connects；The CANFD bus of the one end the 3rd resistor R3 and the 2nd CANFD bus transceiver
The connection of CANFD_L line.Further, it in intermediate node, is connected when second voltage controls third transistor Q3 described in chip controls
When, second resistance R2 is in parallel with 3rd resistor R3, to make the high position data line for being connected across CANFD bus for terminal resistance
Between CANFD_H and low data line CANFD_L.
Specifically, the second resistance R2 is identical as the resistance value of the first resistor R1.It should be noted that first resistor
It is the resistance of the node maintenance normal communication in CANFD bus with second resistance.
Specifically, the resistance value of the first resistor R1 is between 2000 ohm~5000 ohm；The second resistance R2's
Resistance value is between 2000 ohm~5000 ohm.
It should be noted that in the present embodiment, the type of the first CANFD bus transceiver and the 2nd CANFD bus transceiver
Number can be identical, for example the model of the first CANFD bus transceiver and the 2nd CANFD bus transceiver is N431；First electricity
Voltage-controlled coremaking piece can be identical with the model of second voltage control chip, for example first voltage control chip and second voltage control
The model of chip is T60P.
Multinode terminal resistance compartment system provided in an embodiment of the present invention based on CANFD bus, two in CANFD bus
The terminal resistance of a terminal node is failed or is lost, other nodes successively get through inline resistance and serve as terminal node, CANFD bus
System will not be destroyed, and vehicle CANFD communication would not also paralyse completely, so that CANFD bus be made to keep normal communication.
For above system, relatively, the embodiment of the invention also provides a kind of multinode terminals based on CANFD bus
Distribution of resistance method, as shown in figure 5, the described method comprises the following steps:
Step 100: starting.
Step 101: setting is connected across a high position for the CANFD bus in the terminal node for being located at CANFD bus one end
Former terminal resistance between data line CANFD_H and low data line CANFD_L；Total by CANFD with the terminal node
Standby terminal resistance is set in one or more intermediate nodes that line sequentially connects.
It should be noted that the resistance value of the former terminal resistance is 120 ohm in the embodiment of the present invention.
Step 102: the terminal node is communicated with other nodes in CANFD bus, and detects other institutes in CANFD bus
Have whether node can not communicate；If so, executing step 103；Otherwise, step 106 is executed.
Step 103: the terminal node disconnects the connection of the former terminal resistance and CANFD bus.
Step 104: the intermediate node adjacent with the terminal node detects whether to communicate with the terminal node；If
It is to execute step 106；Otherwise, step 105 is executed.
Step 105: controlling the high position data line CANFD_H that its internal standby terminal resistance is connected across the CANFD bus
Between low data line CANFD_L, so that vehicle CANFD bus keeps normal communication.
Step 106: terminating.
Multinode terminal resistance location mode provided in an embodiment of the present invention based on CANFD bus, when CANFD bus two
When the terminal node at end can not be communicated with every other intermediate node in CANFD bus, become by breaking inner former terminal resistance
For intermediate node, and the node adjacent with terminal node be with terminal node when that can not communicate, by controlling its internal standby terminal
Resistance is connected across between the high position data line CANFD_H of CANFD bus and low data line CANFD_L, serves as terminal node, is led to
The present invention is crossed, ensure that the normal communication of CANFD bus.
Further, when the intermediate node exception adjacent with terminal node, in order to guarantee the normal communication of CANFD bus,
The present invention also provides another embodiments, specifically the following steps are included:
Step 200: starting.
Step 201: setting is connected across a high position for the CANFD bus in the terminal node for being located at CANFD bus one end
Former terminal resistance between data line CANFD_H and low data line CANFD_L；Total by CANFD with the terminal node
Standby terminal resistance is set in one or more intermediate nodes that line sequentially connects.
Step 202: the terminal node is communicated with other nodes in CANFD bus, and detect with CANFD bus on other
Whether all nodes can not communicate；If so, executing step 203；Otherwise, step 208 is executed.
Step 203: the terminal node disconnects the connection of the former terminal resistance and CANFD bus.
Step 204: the intermediate node adjacent with the terminal node detects whether to communicate with the terminal node；If
It is to execute step 208；Otherwise, step 205 is executed.
Step 205: controlling the high position data line CANFD_H that its internal standby terminal resistance is connected across the CANFD bus
Between low data line CANFD_L, so that vehicle CANFD bus keeps normal communication.
Step 206: it is communicated with the non-conterminous intermediate node of the terminal node with all nodes in CANFD bus, and
Detect whether all intermediate nodes with the terminal node and between the terminal node can not communicate；If so,
Execute step 207；Otherwise, step 208 is executed.
Step 207: controlling the high position data line CANFD_H that its internal standby terminal resistance is connected across the CANFD bus
Between low data line CANFD_L.
Step 208: terminating.
Multinode terminal resistance location mode provided in an embodiment of the present invention based on CANFD bus, in CANFD bus two
When the terminal node at end can not be communicated with every other intermediate node in CANFD bus, pass through breaking inner former terminal electricity
Resistive is intermediate node；The node adjacent with terminal node is internal standby whole by controlling it when that can not communicate with terminal node
End resistance is connected across between the high position data line CANFD_H of CANFD bus and low data line CANFD_L, serves as terminal node；
Further, when the node adjacent with terminal node can not be communicated with terminal node, with the non-conterminous centre of the terminal node
Whether node can be communicated by detection with all intermediate nodes between terminal node, if cannot communicate, pass through control
Its internal standby terminal resistance be connected across the CANFD bus high position data line CANFD_H and low data line CANFD_L it
Between, serve as terminal node.Through the invention, the normal communication that ensure that CANFD bus further improves the total linear system of CANFD
The reliability of system.
The embodiment of the present invention has been described in detail above, and specific embodiment used herein carries out the present invention
It illustrates, the above embodiments are only used to help understand system and method for the invention；Meanwhile for the one of this field
As technical staff, according to the thought of the present invention, there will be changes in the specific implementation manner and application range, to sum up institute
It states, the contents of this specification are not to be construed as limiting the invention.
Claims (7)
1. a kind of multinode terminal resistance compartment system based on CANFD bus characterized by comprising be sequentially connected to
The terminal node of CANFD bus and one or more intermediate nodes, wherein the terminal node is located at the one of CANFD bus
End；
The terminal node includes the high position data line CANFD_H and low data line CANFD_L for being connected across the CANFD bus
Between former terminal resistance and first resistor for maintaining bus normal communication；Standby terminal is provided in each intermediate node
Resistance and second resistance for maintaining bus normal communication；
The terminal node detects when can not communicate with node every other in CANFD bus, disconnects the former terminal electricity
The connection of resistance and CANFD bus, and first resistor is sealed in into bus loop；The intermediate node detection adjacent with the terminal node
The seniority top digit of the CANFD bus is connected across to the standby terminal resistance for when can not communicate with the terminal node, controlling its inside
According between line CANFD_H and low data line CANFD_L, so that vehicle CANFD bus keeps normal communication.
2. the multinode terminal resistance compartment system according to claim 1 based on CANFD bus, which is characterized in that with
The non-conterminous intermediate node of terminal node detects all with the terminal node and between the terminal node
When intermediate node can not communicate, the high position data line that its internal standby terminal resistance is connected across the CANFD bus is controlled
Between CANFD_H and low data line CANFD_L.
3. the multinode terminal resistance compartment system according to claim 1 or 2 based on CANFD bus, which is characterized in that
The terminal node further include: the first CANFD bus transceiver, the first central controller, first voltage control chip, the one or three
Pole pipe and the second triode；First triode, the second triode base stage respectively with the first voltage control chip
Connection, first triode, the second triode collector connect with the first CANFD bus transceiver；Described
One resistance is connected between the emitter and the first CANFD bus transceiver of first triode, and the former terminal resistance connects
It connects between the emitter and the first CANFD bus transceiver of second triode；The first CANFD bus transceiver connects
Receive or send CANFD bus signals；First central controller is received according to the first CANFD bus transceiver
First voltage described in CANFD bus signal control controls chip, so that the two or three described in first voltage control chip controls
The on-off of pole pipe, thus the connection of open or closed the former terminal resistance and CANFD bus.
4. the multinode terminal resistance compartment system according to claim 3 based on CANFD bus, which is characterized in that institute
The resistance value for stating former terminal resistance is 120 ohm.
5. the multinode terminal resistance compartment system according to claim 4 based on CANFD bus, which is characterized in that institute
State intermediate node further include: the 2nd CANFD bus transceiver, the second central controller, second voltage control chip, the three or three pole
Pipe, 3rd resistor；The second resistance is in parallel with the 3rd resistor as the standby terminal resistance；Second center control
Device is connect with the 2nd CANFD bus transceiver, second voltage control chip respectively；The second resistance and described the
The connection of two CANFD bus transceivers, and the second resistance is connected to the collector and 3rd resistor of the third transistor
Between one end, the emitter of the third transistor is connect with the 3rd resistor other end, the base stage of the third transistor
It is connect with second voltage control chip；The 2nd CANFD bus transceiver receives or sends CANFD bus signals；Institute
State the second central controller second electricity according to the received CANFD bus signal control of the 2nd CANFD bus transceiver
Voltage-controlled coremaking piece, so that third transistor on-off described in second voltage control chip controls, to control the standby terminal
Resistance is connected across or is disconnected between the high position data line CANFD_H and low data line CANFD_L of the CANFD bus.
6. the multinode terminal resistance compartment system according to claim 5 based on CANFD bus, which is characterized in that institute
It is identical as the resistance value of the first resistor to state second resistance.
7. the multinode terminal resistance compartment system according to claim 6 based on CANFD bus, which is characterized in that institute
The resistance value of first resistor is stated between 2000 ohm~5000 ohm.
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| CN112230948B (en) * | 2019-06-30 | 2022-01-07 | 比亚迪股份有限公司 | Vehicle CAN communication system, software upgrading method, equipment and system and vehicle |
| CN111541600B (en) * | 2020-05-22 | 2022-04-26 | 北京润科通用技术有限公司 | Bus network generation method and device applied to weaponry |
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