CN211166744U - Electrical CAN communication connecting device between tractor and trailer and between trailer - Google Patents

Abstract

The utility model relates to a vehicle electrical connection and communication field discloses electricity between tractor and trailer and the trailer, CAN communication connecting device, and it includes tractor braking unit and trailer electronic braking unit, and tractor electronic braking unit and trailer electronic braking unit connect electrical connection through ISO7638, and tractor electronic braking unit and trailer electronic braking unit all have a plurality of CAN transceivers to CAN realize the CAN communication between the adjacent vehicle, the utility model discloses because tractor electronic braking unit and trailer electronic braking unit have integrateed the function of electrical distribution and gateway, have saved a large amount of pencil for whole car, and have saved a special electronic unit, the circuit is arranged and is connected more nimble, compact moreover. And the technical problem that normal CAN communication CAN not be carried out between the nodes of the transceivers of different physical layer levels is solved, and the compatibility of CAN communication between the tractor and the trailer as well as between trailer trains is guaranteed.

Description

Electrical CAN communication connecting device between tractor and trailer and between trailer

Technical Field

The invention relates to an electrical connection and a CAN communication connection between a tractor and a trailer train, in particular to an electrical and CAN communication connection device between the tractor and the trailer train.

Background

The electrical connections between the tractor and trailer and the trailer train equipped with an Electronic Brake System (EBS) are made using a standard connector compliant with ISO7638, which contains 7 pins, namely a battery positive electrode, an ignition positive electrode, a power ground, an alarm indicator positive electrode, an alarm indicator ground, CAN _ H and CAN _ L, wherein CAN _ H and CAN _ L are buses for transferring information between the tractor and trailer and the trailer train, and generally conform to the standard of ISO11992, which defines the physical layer signal standard of the CAN bus and the specifications of network node initialization, network management, network message forwarding, in the conventional art known in the art, the electrical connections and network management between the tractor and trailer and the train are made using a special trailer central electronic unit (gateway), as shown in fig. 1.

The tractor 1 is equipped with traditional tractor electronic brake unit (EBS)7, and traditional tractor electronic brake unit 7 links to each other with tractor gateway 8, and tractor gateway 8 sends power, fault indicator lamp, CAN communication interface to the central electronic unit of trailer (gateway) 6 in first trailer 2 through ISO7638 joint 5, and the central electronic unit of trailer (gateway) 6 then divides two tunnel electrical interface, and one road is connected to local (this trailer) traditional trailer electronic brake unit (EBS)9, and the other road is connected to follow-up second trailer 3 through subsequent ISO7638 joint. The central electronic unit (gateway) of the second trailer 3 then sends the electrical connections in the same way to the local conventional electronic brake unit (EBS)8 of the second trailer 3 and to the ISO7638 connector 5 of the subsequent trailer, respectively, and so on until the last trailer. The central electronic unit (gateway) 6 of the trailer plays the roles of an electrical relay, a junction box and a gateway, forms a local network segment with a local traditional trailer electronic brake unit (EBS)9, and the functions of network management, network initialization, network message forwarding and the like are all realized by the central electronic unit (gateway) 6 of the trailer.

In the above conventional electrical connection manner, the conventional tractor electronic brake unit (EBS)7 and the conventional trailer electronic brake unit (EBS)9 only need to be responsible for the braking function of the vehicle, and do not need to consider the functions in the network management and the electrical distribution, but such an electrical connection manner inevitably causes a lot of vehicle wiring harnesses, and an electronic unit (gateway) is added to be specifically responsible for the electrical distribution and the network management, which not only increases the cost, but also cannot be flexibly arranged.

In addition, ISO11992 defines CAN physical layer signal levels of 24V and 12V for tractors and trailers of 24V and 12V systems, respectively. However, the signal level of the CAN communication physical layer defined in ISO 11898 and SAE J1939 standards is 5V, and 5V CAN communication is widely applied to communication of various passenger vehicles, commercial vehicles and special vehicles, and is irrelevant to whether the vehicle adopts a 24V system or a 12V system. At present, almost all CAN communication transceiver chips adopt a 5V level for communication, and transceiver chips of 24V and 12V communication levels are only used in a very small amount and are in monopoly and non-open states. Normal CAN communication cannot be performed between nodes of transceivers adopting different physical layer levels, which causes a great compatibility problem for CAN communication between a tractor and a trailer as well as between trailer trains.

Furthermore, Wabco in CN109479186A discloses a method for constructing a wireless network between a tractor and a trailer, but still relies on the connection construction of the wireless network after the normal connection of the CAN bus between the tractor and the trailer, and does not solve the problem of CAN communication compatibility between the tractor and the trailer and between trailer trains.

Disclosure of Invention

In order to avoid the above disadvantages caused by the traditional electric connection mode between the tractor and the trailer and between the trailer train and solve the compatibility problem between different CAN communication physical levels, the invention provides an electric CAN communication connection device between the tractor and the trailer and between the tractor and the trailer.

In order to solve the technical problem, the invention is solved by the following technical scheme:

the electric and CAN communication connection device between the tractor, the trailer and the trailer comprises a tractor braking unit and a trailer electronic braking unit, wherein the tractor electronic braking unit and the trailer electronic braking unit are electrically connected through a connector, the tractor electronic braking unit is provided with a first socket and a second socket, the tractor electronic braking unit comprises a tractor network management unit and a tractor braking control unit, the first socket is used for supplying power to the tractor network management unit and the tractor braking control unit through pin combination and is connected to the second socket, the second socket is connected to a plug, a CAN _ H pin and a CAN _ L pin are arranged in the second socket, a tractor CAN transceiver unit is arranged in the tractor electronic braking unit, the CAN _ H pin and the CAN _ L pin are both connected to the tractor transceiver unit, the tractor network management unit enables or disables the tractor CAN transceiver unit through the enabling pin, the tractor CAN transceiver unit is in communication connection with the tractor network management unit, the tractor CAN transceiver unit is connected with the CAN _ H pin or/and the CAN _ L pin through the CAN transceiver unit, the tractor transceiver unit CAN receive and the electric level signals or the CAN _ H and CAN _ L enter a tractor management unit through a CAN _ H or CAN _ TM bus, and the tractor management unit is connected with a tractor V _ TM 24 or CAN _ TM 12 or a tractor V _ TM which CAN receive/TM which CAN receive and a tractor or CAN _ TM 12 or a tractor V _ TM which CAN receive/TM 12 or a tractor and a tractor.

Preferably, the tractor electronic brake unit further comprises a CAN bus level signal processing circuit, the CAN bus level signal processing circuit is connected with a CAN _ H pin or/and a CAN _ L pin and processes a voltage signal of the CAN _ H or a voltage signal of the CAN _ L, the processed level signal enters a tractor CAN bus level signal acquisition port, and the tractor network management unit and the brake control unit perform data interaction through data communication.

Preferably, the trailer electronic brake unit comprises a previous socket which CAN be connected to a joint between the trailer electronic brake unit and a previous vehicle, the trailer electronic brake unit also comprises a trailer network management unit and a trailer brake control unit, the previous socket is internally provided with a previous CAN _ H pin and a previous CAN _ L pin, the previous CAN _ H pin and the previous CAN _ L pin are both connected to the previous CAN transceiver unit, the trailer network management unit enables or disables the previous CAN transceiver unit through an enabling pin, the trailer network management unit is provided with a previous CAN channel and is connected to the previous CAN transceiver unit through the previous CAN channel and is connected with the previous CAN _ H pin or/and the previous CAN _ L pin through the previous CAN transceiver unit and carries out CAN communication, the previous CAN _ H or/and the previous CAN _ L level signals enter a previous CAN bus level signal acquisition port of the trailer and are acquired and subsequently processed by the trailer network management unit;

the preceding CAN transceiver unit comprises one or two of a 24V CAN transceiver, a 12V CAN transceiver and a 5V CAN transceiver or simultaneously comprises a 24V CAN transceiver, a 12V CAN transceiver and a 5V CAN transceiver;

when the types of the CAN transceivers in the previous CAN transceiver units are two or three, the trailer network management unit CAN enable/disable each CAN transceiver independently, and the trailer network management unit is connected with the CAN _ H pin or/and the CAN _ L pin through one of the two or three CAN transceivers to carry out CAN communication.

Preferably, the previous CAN _ H pin or/and the previous CAN _ L pin are/is further connected to a trailer previous CAN bus level signal processing circuit, the processing circuit processes voltage signals of the previous CAN _ H pin or/and the previous CAN _ L D, the processed level signals enter a trailer previous CAN bus level signal acquisition port and are acquired and subsequently processed by a trailer network management unit, and the trailer network management unit and the trailer brake control unit perform data interaction through data communication.

Preferably, the automatic trailer comprises a subsequent socket, a data channel is arranged between the trailer network management unit and the brake control unit, the subsequent socket is connected to the subsequent socket, the subsequent socket CAN be connected to a joint between subsequent trailers, a subsequent CAN _ H pin and a subsequent CAN _ L pin are arranged in the subsequent socket, the subsequent CAN _ H pin and the subsequent CAN _ L pin are both connected to a subsequent CAN transceiver unit, the trailer network management unit enables or disables the subsequent CAN transceiver unit through an enabling pin respectively, the trailer network management unit is provided with a subsequent CAN channel and is connected to the subsequent CAN transceiver unit through the subsequent CAN channel and is connected with the subsequent CAN _ H pin or/and the subsequent CAN _ L through one of the subsequent CAN transceiver units and carries out CAN communication, the subsequent CAN _ H pin or/and the subsequent CAN _ L pin are also connected to a subsequent CAN bus level signal processing circuit, the processing circuit processes the voltage signal of the subsequent CAN _ H, the processed level signal enters a subsequent bus level signal acquisition port of the trailer pin, and is acquired and subsequently processed by the trailer network management unit;

the subsequent CAN transceiver unit comprises one or two of a 24V CAN transceiver, a 12V CAN transceiver and a 5V CAN transceiver or simultaneously comprises the 24V CAN transceiver, the 12V CAN transceiver and the 5V CAN transceiver;

when the types of the CAN transceivers in the subsequent CAN transceiver units are two or three, the trailer network management unit CAN enable/disable each CAN transceiver independently, and the trailer network management unit CAN communicate with the CAN _ H pin or/and the CAN _ L pin through one of the two or three CAN transceivers.

Preferably, the subsequent CAN _ H pin or/and the subsequent CAN _ L pin is/are further connected to a subsequent CAN bus level signal processing circuit of the trailer, the processing circuit processes the voltage signals of the subsequent CAN _ H pin or/and the subsequent CAN _ L, and the processed level signals enter a subsequent CAN bus level signal acquisition port of the trailer and are acquired and subsequently processed by the trailer network management unit.

Preferably, the number of the first sockets is 1 or more, the number of the second sockets is ISO7638 sockets, and the number of the second sockets is one or more.

Preferably, the trailer network management unit and the trailer brake control unit are integrated in one processing unit, or/and the tractor network management unit and the tractor brake control unit are integrated in one processing unit.

Preferably, the preceding socket and the following socket are both ISO7638 sockets, and the number of the preceding socket and the following socket is 1 or more.

Preferably, the number of trailers is plural, adjacent trailer brake units being electrically connected by a connector, the preceding socket of the first trailer being connected to the connector between the tractor and the first trailer, the second socket of the tractor being connected to the connector between the tractor and the first trailer; the subsequent socket of the first trailer is connected to the connection between the first trailer and the second trailer, the previous socket of the second trailer is connected to the connection between the first trailer and the second trailer, and the cycle is repeated to the last trailer; the first socket comprises a pin combination, the second socket comprises a pin combination, the pin combination of the first socket supplies power for the tractor network management unit and the trailer brake control unit, and the pin combination of the first socket is connected with the pin combination of the second socket; the pin combination of the previous socket supplies power for the trailer network management unit and the trailer brake control unit and is connected to the pin combination of the subsequent socket, and the pin combination of the previous socket is connected with the pin combination of the subsequent socket.

Due to the adoption of the technical scheme, the electric distribution and gateway functions are integrated by the tractor electronic brake unit and the trailer electronic brake unit, so that a large number of wire harnesses are saved for the whole vehicle, a special electronic unit is omitted, and the circuit arrangement and connection are more flexible and compact. And the technical problem that normal CAN communication CAN not be carried out between the nodes of the transceivers of different physical layer levels is solved, and the compatibility of CAN communication between the tractor and the trailer as well as between trailer trains is guaranteed.

Drawings

Fig. 1 is a schematic diagram of a tractor and trailer connection of the background art.

Fig. 2 is a schematic view of the coupling of the tractor and trailer.

Fig. 3 is a schematic view of the tractor electric brake unit.

Fig. 4 is a schematic view of the trailer electric brake unit.

Fig. 5 is a diagram of a communication establishment procedure.

Graph marking table

1. Tractor vehicle

2. First trailer

3. Second trailer

4. Third trailer

5. ISO7638 joint

6. Trailer central electronic unit (gateway)

7. Electronic brake unit of traditional tractor (EBS)

8. Tractor gateway

9. Electronic brake unit of traditional trailer (EBS)

10. Tractor electronic brake unit (EBS)

1001. Tractor common socket

1002. Power supply and alarm indicator lamp pin combination of tractor common socket

1003. Tractor network management unit

1004. Tractor brake control unit

1005. Data exchange channel 1006 between tractor network management unit and brake control unit, tractor ISO7638 socket

1007. Power supply and alarm indicator lamp pin combination of tractor ISO7638 socket

1008. CAN _ H pin of ISO7638 socket of tractor

1009. CAN _ L pin of tractor ISO7638 socket

1010. Tractor 24V CAN transceiver

1011. Tractor 5V CAN transceiver

1012. Tractor CAN bus level signal processing circuit

1013. CAN bus level signal acquisition port of tractor

1014. Tractor 5V CAN transceiver enabling pin

1015. Tractor 24V CAN transceiver enabling pin

1016. CAN transmitting pin of tractor

1017. CAN receiving pin of tractor

1018. CAN channel of tractor

11. Trailer electronic brake unit (EBS)

1101. Trailer ISO7638 front socket

1102. Power supply and alarm indicator lamp pin combination of trailer ISO7638 preceding socket

1103. CAN _ H pin of trailer ISO7638 preceding socket

1104. CAN _ L pin of trailer ISO7638 preceding socket

1105. Trailer ISO7638 subsequent socket

1106. Power supply and alarm indicator lamp pin combination of trailer ISO7638 subsequent socket

1107. CAN _ H pin of trailer ISO7638 subsequent socket

1108. CAN _ L pin of trailer ISO7638 subsequent socket

1109. Data channel between trailer network management unit and brake control unit

1110. Trailer network management unit

1111. Trailer front-end CAN channel

1112. Trailer subsequent CAN channel

1113. Trailer front-end CAN bus level signal processing circuit

1114. Trailer front-end CAN bus level acquisition port

1115. Trailer front-end 5V CAN transceiver enabling pin

1116. Trailer front 24V CAN transceiver enabling pin

1117. Trailer front-end 24V CAN transceiver

1118. Trailer front-end CAN transmitting pin

1119. Trailer front-end CAN receiving pin

1120. Trailer front-end 5V CAN transceiver

1121. Subsequent CAN bus level signal processing circuit of trailer

1122. Trailer follow-up CAN bus level acquisition port

1123. Trailer subsequent 24V CAN transceiver

1124. Trailer subsequent 24V CAN transceiver enabling pin

1125. Trailer follow-up 5V CAN transceiver

1126. Trailer follow-up 5V CAN transceiver enabling pin

1127. Trailer subsequent CAN transmitting pin

1128. Trailer subsequent CAN receiving pin

1129. A trailer brake control unit.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

The present embodiment describes the core idea of the present invention by taking a typical "tractor + semi-trailer train" compatible with 24V and 5V CAN communication as an example, but it does not represent that the present invention is limited to the described vehicle model and application scenario, and those skilled in the art should easily apply the core idea of the present invention to other various vehicle models and scenarios and perform corresponding flexible processing according to the description herein.

Fig. 2 shows a tractor-trailer combination, the components and interfaces not relevant to the core idea of the invention not being shown. The tractor 1 is equipped with a tractor electronic brake unit (EBS)10 and is fed from a second socket of the tractor brake unit (EBS)10, which is an ISO7638 socket 1006, directly leading out the electrical interface to the connection between the tractor 1 and the first trailer 2, which is an ISO7638 connection 5, and the electronic brake unit (EBS)11 of the first trailer 2 is connected to the above-mentioned ISO7638 connection 5 through a preceding socket 1101 (preceding socket) whose preceding socket is ISO7638, so as to establish an electrical connection with the tractor 1, and then is branched off from a subsequent socket 1105 (subsequent socket) whose ISO7638 to the subsequent ISO7638 connection 5. Similarly, the trailer electronic brake unit (EBS)11 of the second trailer 3 obtains an electrical connection with the first trailer 2 by connecting its ISO7638 socket 1101 with the ISO7638 connector 5, and then branches off a electrical connection from its ISO7638 socket 1105 to the subsequent ISO7638 connector 5 and establishes an electrical connection with the ISO7638 socket 1101 of the trailer electronic brake unit (EBS)11 of the third trailer 4. The cycle is repeated until the last trailer. The tractor electronic brake unit (EBS)10 and the trailer electronic brake unit (EBS)11 integrate the functions of electrical distribution and gateway, saving a large number of harnesses for the entire vehicle and a dedicated electronic unit, and making the wiring layout and connection more flexible and compact.

The tractor electronic brake unit (EBS)10 has one or more first sockets, shown as socket 1001 in the figure, for connection to a tractor power supply, internal CAN communication, input/output channels, etc., the socket 1001 contains a tractor normal socket power and alarm indicator pin combination 1002 associated with the present invention, which provides power to the tractor network management unit 1018 and the tractor brake control unit 1004, and connects to a tractor ISO7638 socket 1006 (second socket) power and alarm indicator pin combination 1007, the needle combination 1002 is directly connected to the pin combination 1007, it will be appreciated by those skilled in the art that the pin combination 1002 may be connected to the pin combination 1007 after being processed as necessary, the tractor ISO socket 7638 may be a separate dedicated socket, may be integrated as a part of a pin plug into a larger socket or be distributed among a plurality of sockets, none of which affects the concept of the CAN transceiver 10, the tractor ISO management unit ISO pin combination 1018 may be connected to a trailer ISO bus 26, the tractor ISO bus 24 may be connected to a tractor H transceiver 24 via a separate cable transceiver 24, the CAN transceiver 24, the tractor transceiver 24 may be connected to a trailer ISO bus 26, and a trailer ISO bus transceiver 24, and a trailer ISO transceiver 14 may process a signal processing system for simultaneous processing by a CAN be connected to a transceiver 26, the CAN process a signal processing system including a signal processing between the two CAN be connected to a trailer H24 transceiver 26 and a transceiver 26, a transceiver 26 for simultaneous processing interface between the tractor H transceiver 24 transceiver 26 and a transceiver 26, a transceiver 26 transceiver 24 transceiver 26 for processing interface for processing a transceiver 26 for processing a CAN interface for processing a transceiver 26 for processing a transceiver 24 transceiver 26 for simultaneous processing a transceiver 26 for processing a transceiver 24 transceiver 26 for processing a transceiver for processing a trailer H transceiver for processing a signal processing a trailer H transceiver 24H transceiver for processing a signal for a trailer H transceiver 24H transceiver 26H transceiver 24H transceiver.

Similarly, fig. 4 shows an overview of the trailer electronic brake unit (EBS)11, components and interfaces not relevant to the core concept of the present invention are not shown, the trailer electronic brake unit (EBS)11 has an ISO7638 preceding socket 1101 for connection to an ISO7638 plug 5 between the tractor 1 or a preceding trailer, the preceding socket 1101 may be a separate dedicated socket, may be integrated as a part of a pin into a larger socket or be distributed as a plurality of sockets, neither does not affect the core concept of the present invention, the preceding socket 1101 includes a power and alarm indicator pin combination 1102 which supplies power to the trailer network management unit 1110 and the trailer brake control unit 1129, and is connected to a power and alarm indicator pin combination 1105 of the subsequent socket 1105 of the ISO7638, the following socket 1110 may be connected to a preceding network bus 11124 via a preceding bus 111111111, and may be connected to a preceding bus 11124 via a preceding bus 11119, and may be connected to a preceding transceiver bus 11124 via a preceding bus 11124, and a subsequent bus 11124 bus 1118, and may be connected to a preceding transceiver bus 11124 via a preceding transceiver bus 11126, and a following cable bus 11124, and a following cable bus 11124, and a following cable may be connected to a following cable bus 11124, a following cable bus transceiver no longer comprises a preceding transceiver 26, a following cable 1118, a preceding transceiver 26, a following cable bus transceiver 26, a following cable 11126, a following cable bus transceiver 26, a following cable 11126, a following cable 26, a following cable bus transceiver 26, a following cable may be connected to a following cable bus transceiver 26, a following cable bus transceiver 26, a following cable bus handler 26, a following cable 1118, a following cable 26, a following cable bus handler 26, a following cable may be connected to a following cable 26, a following cable bus handler 26, a following cable handler 26, a following cable bus handler 26, a following cable bus handler may be connected to a following cable handler 26, a following cable bus handler 26, a following cable handler 26, a following cable handler 26, a following cable handler 26, a following cable handler 26, a following cable 26, a following.

The process of establishing CAN communication between the tractor 1 and the first, second and third trailers 2, 3, 4 in this embodiment is shown in fig. 5:

1) the system is powered up, and the tractor electronic brake unit (EBS)10 and the electronic brake units (EBS)11 of all trailers complete a power-up self-test and other necessary initialization operations.

2) The tractor electronic brake unit (EBS)10 and all trailer electronic brake units (EBS)11 enable all 5V CAN transceivers themselves connected to the ISO7638 connector 5, disable all 24V CAN transceivers, and enter the CAN bus listening mode (receive messages only, not send any messages and respond to the padding bits). This process is not necessarily performed synchronously, for example, the power-on time is divided into successive times or an intermediate temporary access is performed.

3) The tractor electronic brake unit (EBS)10 detects the voltage of the tractor CAN _ H through the tractor CAN bus level signal collection port 1013, and the electronic brake units (EBS)11 of the first, second, and third trailers 2, 3, and 4 detect the voltages of their preceding and subsequent CAN _ H through their preceding and subsequent CAN bus level signal collection ports 1113 and 1122, respectively.

4) The tractor electronic brake unit (EBS)10 and the electronic brake units (EBS)11 of all trailers judge whether the voltage of the CAN _ H is within the range of 5V CAN communication standard (ISO 11898), if so, the corresponding CAN channel adopts 5V CAN communication and enters a subsequent normal communication mode; and if not, entering the next step, and judging whether the communication is in the 24V CAN communication standard range.

5) The tractor electronic brake unit (EBS)10 and all trailer electronic brake units (EBS)11 judge whether the voltage of CAN _ H is in the range of 24V CAN communication standard (ISO 11992), if so, the corresponding CAN channel adopts 24V CAN communication and enters the next step to switch the corresponding channel to 24V CAN communication; otherwise, returning to the step 3) to continuously detect the voltage of the CAN _ H.

6) The tractor electronic brake unit (EBS)10 and the electronic brake units (EBS)11 of all trailers each disable the 5V CAN transceiver of the corresponding CAN channel and enable the 24V CAN transceiver of the corresponding CAN channel, thereby switching the corresponding CAN channel to 24V CAN communication.

7) After the CAN channel is switched to a correct bus communication level, the channel enters a normal communication mode: and according to the specification requirements of ISO11992, carrying out network initialization and message forwarding and normally receiving/sending application messages.

8) In the normal communication mode, if the CAN bus of a certain CAN channel is detected to be closed or the communication connection is disconnected (such as bus fault or node disconnection), the step 3) is returned to detect the CAN _ H voltage of the corresponding CAN channel again.

By the above process and method, the tractor 1 and the first, second and third trailers 2, 3, 4 CAN establish correct CAN communication connections. In this example both the tractor 1 and all trailers support both 24V and 5V CAN communication levels, so the end result is necessarily that all CAN channels use 5V CAN communication levels. The network management unit and the brake control unit in the electronic brake unit are integrated into one processing unit, and a plurality of independent CAN transceivers with different communication voltages are not adopted, but a combination of the transceiver and an auxiliary circuit with the same multi-voltage communication function is adopted, and the like, and the extension and the modification of the application are regarded as the core idea of the invention and are protected.

Example 2

This embodiment is different from embodiment 1 in that: the first trailer 2 only supports 24V CAN communication, the third trailer 4 only supports 5V CAN communication, the tractor 1 and the second trailer 3 simultaneously support 24V CAN and 5V CAN communication, and after the CAN communication connection is established according to the process and the method, finally 24V CAN communication is performed between the tractor 1 and the first trailer 2, 24V CAN communication is performed between the first trailer 2 and the second trailer 3, and 5V CAN communication is performed between the second trailer 3 and the third trailer 4.

Example 3

This embodiment is different from embodiment 1 in that the CAN _ H level is detected instead of the CAN _ L level during the communication establishment.

Example 4

This embodiment is different from embodiment 1 in that only the CAN _ H level is detected instead of detecting the CAN _ H level by detecting the CAN _ L level and the CAN _ H level during the establishment of communication.

Example 5

This embodiment is different from embodiment 1 in that: the CAN transceiver units in the trailer electronic brake unit and the tractor electronic brake unit comprise one or two of a 24V CAN transceiver, a 12V CAN transceiver and a 5V CAN transceiver or simultaneously comprise the 24V CAN transceiver, the 12V CAN transceiver and the 5V CAN transceiver, so that any one, any two or three of 24V, 12V and 5V CAN communication are supported, and after the power-on initialization is completed, the CAN transceiver with the lowest communication level is enabled by default and the other transceivers are forbidden.

Example 6

This embodiment is different from embodiment 1 in that: the tractor electric brake unit comprises 2 or more second sockets and the trailer electric brake unit is provided with two or more preceding ISO7638 sockets or subsequent ISO7638 sockets.

In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.

Claims (10)

1. The electric and CAN communication connection device between the tractor, the trailer and the trailer is characterized by comprising a tractor braking unit and a trailer electronic braking unit which are electrically connected through a connector, wherein the tractor electronic braking unit is provided with a first socket and a second socket, the tractor electronic braking unit comprises a tractor network management unit and a tractor braking control unit, the first socket is combined into a power supply for the tractor network management unit and the tractor braking control unit through pins and is connected to the second socket, the second socket is connected to a plug, the second socket is internally provided with a CAN _ H pin and a CAN _ L pin, the tractor electronic braking unit is internally provided with a tractor CAN transceiver unit, the CAN _ H pin and the CAN _ L pin are both connected to the CAN tractor transceiver unit, the tractor network management unit enables or disables the tractor CAN transceiver unit through the enabling pin, the tractor CAN transceiver unit is in communication connection with the tractor network management unit, the tractor network management unit is connected with the CAN pin or/and the CAN pin L through the CAN transceiver unit to carry out communication, and the level acquisition of CAN signals of CAN _ H or/CAN _ L enter a tractor network management unit and are acquired by a tractor network management bus;

the tractor CAN transceiver unit comprises one or two of a 24V CAN transceiver, a 12V CAN transceiver and a 5V CAN transceiver or simultaneously comprises the 24V CAN transceiver, the 12V CAN transceiver and the 5V CAN transceiver;

when the types of the CAN transceivers in the tractor CAN transceiver unit are two or three, the tractor network management unit CAN enable/disable each CAN transceiver independently, and the tractor network management unit is connected with the CAN _ H pin or/and the CAN _ L pin through one of the two or three CAN transceivers to carry out CAN communication.

2. The electric and CAN communication connection device between the tractor and the trailer and between the tractor and the trailer according to claim 1, wherein the tractor electronic brake unit further comprises a CAN bus level signal processing circuit, the CAN bus level signal processing circuit is connected with a CAN _ H pin or/and a CAN _ L pin and processes a CAN _ H voltage signal or a CAN _ L voltage signal, the processed level signal enters a tractor CAN bus level signal acquisition port, and the tractor network management unit and the brake control unit perform data interaction through data communication.

3. The electrical and CAN communication connection device between a tractor and a trailer and between the trailer according to claim 1, wherein the trailer electronic brake unit comprises a preceding socket connectable to a connection with the preceding vehicle, the trailer electronic brake unit further comprises a trailer network management unit and a trailer brake control unit, the preceding socket has a preceding CAN _ H pin and a preceding CAN _ L pin therein, the preceding CAN _ H pin and the preceding CAN _ L pin are both connected to the preceding CAN transceiver unit, the trailer network management unit enables or disables the preceding CAN transceiver unit through an enable pin, the trailer network management unit has a preceding CAN channel and is connected to the preceding CAN transceiver unit through the preceding CAN channel and is connected to and communicates with the preceding CAN _ H or/and preceding CAN _ L pins through the preceding CAN transceiver unit, the preceding CAN _ H or/and preceding CAN _ L level signals enter a preceding CAN bus level signal acquisition port, and are acquired and subsequently processed by the trailer bus network management unit;

the preceding CAN transceiver unit comprises one or two of a 24V CAN transceiver, a 12V CAN transceiver and a 5V CAN transceiver or simultaneously comprises a 24V CAN transceiver, a 12V CAN transceiver and a 5V CAN transceiver;

when the types of the CAN transceivers in the previous CAN transceiver units are two or three, the trailer network management unit CAN enable/disable each CAN transceiver independently, and the trailer network management unit is connected with the CAN _ H pin or/and the CAN _ L pin through one of the two or three CAN transceivers to carry out CAN communication.

4. The electrical and CAN communication connection device between the tractor and the trailer and between the trailer according to claim 3, characterized in that the previous CAN _ H pin or/and the previous CAN _ L pin are further connected to the trailer previous CAN bus level signal processing circuit, the processing circuit processes the voltage signal of the previous CAN _ H or/and the previous CAN _ L D, the processed level signal enters the trailer previous CAN bus level signal acquisition port and is acquired and subsequently processed by the trailer network management unit, and the trailer network management unit and the trailer brake control unit perform data interaction through data communication.

5. The electrical and CAN communication connection device between a tractor and a trailer and between the trailer according to claim 3 further comprising a subsequent socket connected to the subsequent socket, the subsequent socket connectable to a connection between the subsequent trailer, the subsequent socket having a subsequent CAN _ H pin and a subsequent CAN _ L pin therein, the subsequent CAN _ H pin and the subsequent CAN _ L pin both connected to the subsequent CAN transceiver unit, the trailer network management unit enabling or disabling the subsequent CAN transceiver unit via the enable pin, respectively, the trailer network management unit having a subsequent CAN channel and connected to the subsequent CAN transceiver unit via the subsequent CAN channel and connected to and in CAN communication with the subsequent CAN _ H pin or/and the subsequent CAN _ L pin via one of the subsequent CAN transceiver units, the subsequent CAN _ H pin or/and the subsequent CAN _ L pin further connected to a subsequent CAN bus level signal processing circuit which processes a voltage signal of the subsequent CAN _ H, the processed level signal entering a subsequent trailer bus level signal acquisition port, the trailer network management unit processing and the trailer network management unit processing unit having a control channel for exchanging data with the trailer network management unit;

the subsequent CAN transceiver unit comprises one or two of a 24V CAN transceiver, a 12V CAN transceiver and a 5V CAN transceiver or simultaneously comprises the 24V CAN transceiver, the 12V CAN transceiver and the 5V CAN transceiver;

when the types of the CAN transceivers in the subsequent CAN transceiver units are two or three, the trailer network management unit CAN enable/disable each CAN transceiver independently, and the trailer network management unit CAN communicate with the CAN _ H pin or/and the CAN _ L pin through one of the two or three CAN transceivers.

6. The electrical and CAN communication connection device between the tractor and the trailer and between the trailer as claimed in claim 5, wherein the subsequent CAN _ H pin or/and the subsequent CAN _ L pin is further connected to a subsequent CAN bus level signal processing circuit of the trailer, the processing circuit processes the voltage signals of the subsequent CAN _ H or/and the subsequent CAN _ L, the processed level signals enter a subsequent CAN bus level signal acquisition port of the trailer, and the acquisition and the subsequent processing are performed by the trailer network management unit.

7. The electrical, CAN communication connection between a tractor and a trailer according to claim 1, wherein: the number of the first sockets is 1 or more, the number of the second sockets is ISO7638 sockets, and the number of the second sockets is one or more.

8. The electrical, CAN communication connection between a tractor and a trailer of claim 5, wherein: the previous socket and the subsequent socket are both ISO7638 sockets, and the number of the previous socket and the subsequent socket is 1 or more.

9. The electrical, CAN communication connection between a tractor and a trailer according to claim 3, wherein: the trailer network management unit and the trailer brake control unit are integrated in one processing unit, or/and the tractor network management unit and the tractor brake control unit are integrated in one processing unit.

10. The electrical, CAN communication connection between a tractor and a trailer of claim 6, wherein: the number of the trailers is multiple, adjacent trailer brake units are electrically connected through a connector, a front socket of the first trailer is connected to the connector between the tractor and the first trailer, and a second socket of the tractor is connected to the connector between the tractor and the first trailer; the subsequent socket of the first trailer is connected to the connection between the first trailer and the second trailer, the previous socket of the second trailer is connected to the connection between the first trailer and the second trailer, and the cycle is repeated to the last trailer; the first socket comprises a pin combination, the second socket comprises a pin combination, the pin combination of the first socket supplies power for the tractor network management unit and the trailer brake control unit, and the pin combination of the first socket is connected with the pin combination of the second socket; the pin combination of the previous socket supplies power for the trailer network management unit and the trailer brake control unit and is connected to the pin combination of the subsequent socket, and the pin combination of the previous socket is connected with the pin combination of the subsequent socket.

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