In-board communication circuit, device, controller and vehicle
By adopting an in-board communication circuit including dual-channel diodes and pull-up resistors in the vehicle automatic driving controller, high-function safety and high-speed communication between dual MCUs are achieved, and the problems of high cost and insufficient functional safety in the prior art are solved, and low-cost and efficient communication effects are achieved.
Patent Information
- Application Number
- CN202421774490.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-07-25
AI Technical Summary
The prior art is difficult to achieve high-function safety, high-speed and low-cost on-board dual MCU communication in the vehicle autonomous driving controller, especially to meet the ASIL D functional safety requirements and mutually-main-slave communication requirements.
An in-board communication circuit including a first dual channel diode, a first pull-up resistor, a second dual channel diode and a second pull-up resistor is adopted. Through this circuit, mutual master-slave communication between the two communication nodes is realized, ensuring that the level state of the receiver is consistent with that of the transmitter, and avoiding dependence on the CAN communication chip.
It realizes high-speed and functionally secure master-slave communication between two communication nodes without the need for CAN communication chip, reducing hardware costs and layout space requirements, while ensuring the functional safety and communication efficiency of the system.
Smart Images
Figure CN222954072U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electronic circuits, and in particular to an intra-board communication circuit, an intra-board communication device, a controller and a vehicle. Background Art
[0002] In order to meet the current vehicle's demand for high-level autonomous driving (≥L3 autonomous driving level requirements), many key vehicle component controllers (such as wire-controlled steering, wire-controlled braking, etc.) need to develop redundant hardware architectures to cope with single-point failures. The controller can still be in a fail-operation state. The current popular design is a fully redundant hardware structure, that is, there are two sets of key chips (MCU, SBC, pre-driver) in one controller and back up each other. Then, how to choose the communication method between the two MCUs in the PCB board is also a major technical point. The popular communication methods on the market are CAN FD, Ethernet, SPI, PWM, UART, SENT, etc. According to the communication type, communication rate, functional safety requirements, etc., the similarities and differences of these communication methods are compared. The specific comparison results are shown in Table 1 below:
[0003] Table 1 Comparison results of different communication methods
[0004]
[0005] As can be seen from the table above, in order to meet the high-speed and functional safety requirements (ASIL D) of the redundant system controller, SPI, CAN FD, Ethernet and other communication methods are suitable as the communication methods between the dual MCUs in the board. However, for SPI communication, its communication method is master-slave communication, that is, only one MCU can communicate with the other slave MCU as the master, which obviously does not meet the requirements of the system's dual MCU mutual master-slave backup (of course, designers can use two sets of SPI communication, but this method particularly occupies the SPI resources on the MCU and requires the use of 8 communication lines, which is obviously not feasible for controllers with limited SPI resources). In addition, for CAN communication and Ethernet communication, since the current designs on the market require the use of related communication chips, the cost will be relatively high.
[0006] Therefore, there is currently no suitable communication method on the market that can simultaneously meet the following requirements:
[0007] 1. Higher functional safety requirements (ASIL D); 2. Higher communication rate (≥5Mbps); 3. Master-slave communication; 4. Fewer communication resources (number of lines); 5. Lower cost.
[0008] It should be noted that the information disclosed in the background technology section of the utility model is only intended to deepen the understanding of the general background technology of the utility model, and should not be regarded as an admission or suggestion in any form that the information constitutes prior art already known to those skilled in the art. Utility Model Content
[0009] The purpose of the utility model is to provide an intra-board communication circuit, an intra-board communication device, a controller and a vehicle, which can not only save the use of a CAN communication chip and save space and cost for hardware layout, but also meet the functional safety requirements of ASIL D, and can realize mutual master-slave communication between two communication nodes with a higher communication rate.
[0010] To achieve the above-mentioned purpose, the utility model provides an intra-board communication circuit, which is used to realize the intra-board communication between a first communication node and a second communication node, and the intra-board communication circuit includes a first dual-channel diode, a first pull-up resistor, a second dual-channel diode and a second pull-up resistor; the first dual-channel diode includes a first positive terminal, a first negative terminal and a second negative terminal, and the second dual-channel diode includes a second positive terminal, a third negative terminal and a fourth negative terminal; the first end of the first pull-up resistor is connected to the first power supply terminal, the second end of the first pull-up resistor is connected to the first positive terminal, the first end of the second pull-up resistor is connected to the second power supply terminal, and the second end of the second pull-up resistor is connected to the second positive terminal, and the power supply voltage of the first power supply terminal is the same as the power supply voltage of the second power supply terminal; the first negative terminal and the third negative terminal are configured to be connected to the sending end of the first communication node, and the first positive terminal is configured to be connected to the receiving end of the first communication node; the second negative terminal and the fourth negative terminal are configured to be connected to the sending end of the second communication node, and the second positive terminal is configured to be connected to the receiving end of the second communication node.
[0011] Optionally, the supply voltage range of the first power supply end and the second power supply end is [3V, 5V].
[0012] Optionally, the resistance range of the first pull-up resistor and the second pull-up resistor is [10 kΩ, 20 kΩ].
[0013] Optionally, the first dual-channel diode is disposed close to the first communication node, and the second dual-channel diode is disposed close to the second communication node.
[0014] To achieve the above-mentioned purpose, the utility model also provides an intra-board communication device, comprising a first communication node, a second communication node and the intra-board communication circuit described in any one of the above items, the transmitting end of the first communication node is connected to the first negative terminal and the third negative terminal, the receiving end of the first communication node is connected to the first positive terminal, the transmitting end of the second communication node is connected to the second negative terminal and the fourth negative terminal, and the receiving end of the second communication node is connected to the second positive terminal.
[0015] Optionally, the first communication node includes a first micro control unit, and the second communication node includes a second micro control unit.
[0016] Optionally, the transmitting end of the first communication node and the transmitting end of the second communication node are both configured with a push-pull output structure.
[0017] In order to achieve the above object, the utility model further provides a controller, wherein the controller comprises the intra-board communication device as described in any one of the above items.
[0018] In order to achieve the above object, the utility model also provides a vehicle, which includes the controller mentioned above.
[0019] Compared with the prior art, the intra-board communication circuit, intra-board communication device, controller and vehicle provided by the utility model have the following beneficial effects:
[0020] The utility model provides an intra-board communication circuit comprising a first dual-channel diode, a first pull-up resistor, a second dual-channel diode and a second pull-up resistor; the first dual-channel diode comprises a first positive terminal, a first negative terminal and a second negative terminal, and the second dual-channel diode comprises a second positive terminal, a third negative terminal and a fourth negative terminal; the first end of the first pull-up resistor is connected to the first power supply terminal, the second end of the first pull-up resistor is connected to the first positive terminal, the first end of the second pull-up resistor is connected to the second power supply terminal, the second end of the second pull-up resistor is connected to the second positive terminal, and the power supply voltage of the first power supply terminal is the same as the power supply voltage of the second power supply terminal; the first negative terminal and the third negative terminal are configured to be connected to the sending end of the first communication node, and the first positive terminal is configured to be connected to the receiving end of the first communication node; the second negative terminal and the fourth negative terminal are configured to be connected to the sending end of the second communication node, and the second positive terminal is configured to be connected to the receiving end of the second communication node. Thus, by adopting the intra-board communication circuit provided by the utility model, when the transmitting end of the first communication node or the second communication node sends a low-level signal, the receiving ends of the first communication node and the second communication node are both low-level, and when the transmitting end of the first communication node or the second communication node sends a high-level signal, the receiving ends of the first communication node and the second communication node are both high-level, thereby ensuring that the level state of the receiving end can be consistent with the level state of the transmitting end, so that the master-slave communication between the two communication nodes can be realized without the need for a CNA communication chip, thereby not only eliminating the use of a CAN communication chip, saving space and cost for hardware layout, but also meeting the functional safety requirements of ASIL D, and having a higher communication rate. In addition, by adopting the first dual-channel diode and the second dual-channel diode, the utility model can not only ensure that the signal sent by each communication node can be received and mutually verified by the communication node itself and the other communication node, but also ensure that when one of the diode channels of any one of the first dual-channel diode and the second dual-channel diode fails, the interactive communication between the first communication node and the second communication node can still be realized.
[0021] Since the in-board communication device, controller and vehicle provided by the utility model all include the in-board communication circuit provided by the utility model, the in-board communication device, controller and vehicle provided by the utility model at least have all the beneficial effects of the in-board communication circuit provided by the utility model. For details, please refer to the relevant descriptions above, so the beneficial effects of the in-board communication device, controller and vehicle provided by the utility model will not be described one by one here. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1The present invention is a schematic diagram of the structure of an intra-board communication circuit provided in one embodiment of the present invention.
[0023] The reference numerals are as follows:
[0024] In-board communication circuit-100; first dual-channel diode-D1; first positive terminal-111; first negative terminal-112; second negative terminal-113; first pull-up resistor-R1; second dual-channel diode-D2; second positive terminal-131; third negative terminal-132; fourth negative terminal-133; second pull-up resistor-R2; first power supply terminal-A_VDD5_COM; second power supply terminal-B_VDD5_COM;
[0025] First communication node-200;
[0026] Second communication node - 300;
[0027] Transmitter-TX1, TX2; Receiver-RX1, RX2;
[0028] The first micro control unit-A_MCU; the second micro control unit-B_MCU. DETAILED DESCRIPTION
[0029] The following is a further detailed description of the in-board communication circuit, in-board communication device, controller and vehicle proposed in the utility model in combination with the accompanying drawings and specific implementation methods. According to the following description, the advantages and features of the utility model will be clearer. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose provided by the utility model. In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the limiting conditions for the implementation of the utility model. Any modification of the structure, change of the proportional relationship or adjustment of the size, in the case of the same or similar effect and purpose that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model.
[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements. The singular forms "a", "an" and "the" include plural objects, the term "or" is generally used in a sense including "and / or", the term "several" is generally used in a sense including "at least one", and the term "at least two" is generally used in a sense including "two or more". In addition, the terms "first", "second" and "third" are used for descriptive purposes only and are not to be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features.
[0031] The core idea of the utility model is to provide an intra-board communication circuit, an intra-board communication device, a controller and a vehicle, which can not only save the use of a CAN communication chip, save space and cost of hardware layout, but also meet the functional safety requirements of ASIL D, and can realize mutual master-slave communication between two MCUs with a higher communication rate.
[0032] It should be noted that, as can be understood by those skilled in the art, the intra-board communication circuit provided by the present invention can be applied to the intra-board communication device provided by the present invention, the intra-board communication device provided by the present invention can be applied to the controller provided by the present invention, and the controller provided by the present invention can be applied to the vehicle provided by the present invention. The controller provided by the present invention can be, but is not limited to, a wire-controlled steering controller, a wire-controlled brake controller, etc. The vehicle provided by the present invention includes general motor vehicles, such as passenger vehicles including sport utility vehicles (SUVs), buses, trucks, and various commercial vehicles, and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, fuel cell vehicles, and other alternative fuel vehicles (e.g., fuels obtained from resources other than petroleum).
[0033] In order to realize the above idea, the utility model provides an intra-board communication circuit for realizing intra-board communication between a first communication node and a second communication node. Figure 1 , which is a schematic diagram of the structure of the intra-board communication circuit provided by one embodiment of the utility model. Figure 1 As shown, the intra-board communication circuit 100 provided by the utility model includes a first dual-channel diode D1, a first pull-up resistor R1, a second dual-channel diode D2 and a second pull-up resistor R2; the first dual-channel diode D1 includes a first positive terminal 111, a first negative terminal 112 and a second negative terminal 113, and the second dual-channel diode D2 includes a second positive terminal 131, a third negative terminal 132 and a fourth negative terminal 133; the first end of the first pull-up resistor R1 is connected to the first power supply terminal A_VDD5_COM, the second end of the first pull-up resistor R1 is connected to the first positive terminal 111, and the first end of the second pull-up resistor R2 is connected to the second power supply terminal B_VDD5_COM, The second end of the second pull-up resistor R2 is connected to the second positive terminal 131, and the supply voltage of the first power supply terminal A_VDD5_COM is the same as the supply voltage of the second power supply terminal B_VDD5_COM; the first negative terminal 112 and the third negative terminal 132 are configured to be connected to the transmitting terminal TX1 of the first communication node 200, and the first positive terminal 111 is configured to be connected to the receiving terminal RX1 of the first communication node 200; the second negative terminal 113 and the fourth negative terminal 133 are configured to be connected to the transmitting terminal TX2 of the second communication node 300, and the second positive terminal 131 is configured to be connected to the receiving terminal RX2 of the second communication node 300.
[0034] Therefore, by adopting the intra-board communication circuit provided by the utility model, it can be achieved that when the transmitting end TX1 of the first communication node 200 or the transmitting end TX2 of the second communication node 300 sends a low-level signal, the receiving end RX1 of the first communication node 200 and the receiving end RX2 of the second communication node 300 are both low-level (that is, the receiving end RX1 of the first communication node 200 and the receiving end RX2 of the second communication node 300 receive both low-level signals), and when the transmitting end TX1 of the first communication node 200 or the transmitting end TX2 of the second communication node 300 sends a high-level signal. When the first communication node 200 receives a level signal, the receiving end RX1 of the first communication node 200 and the receiving end RX2 of the second communication node 300 are both at a high level (that is, the receiving end RX1 of the first communication node 200 and the receiving end RX2 of the second communication node 300 receive both high-level signals), thereby ensuring that the level state of the receiving end can be consistent with the level state of the sending end, so that the master-slave communication between the two communication nodes can be realized without the need for a CNA communication chip, thereby not only eliminating the use of a CAN communication chip, saving space and cost for hardware layout, but also meeting the functional safety requirements of ASIL D and having a higher communication rate. In addition, the utility model adopts the first dual-channel diode D1 and the second dual-channel diode D2, which not only ensures that the signal sent by each communication node can be received and mutually verified by the communication node itself and another communication node, but also ensures that when one of the diode channels of any one of the first dual-channel diode D1 and the second dual-channel diode D2 fails, the interactive communication between the first communication node 200 and the second communication node 300 can still be realized.
[0035] In some exemplary embodiments, the supply voltage range of the first power supply terminal A_VDD5_COM and the second power supply terminal B_VDD5_COM is [3V, 5V]. Since the CAN signal is a bit stream signal that alternates between a dominant level and a recessive level, wherein the dominant level corresponds to a low level and the recessive level corresponds to a high level, and the value range of the dominant level (low level) in the CAN signal is generally 0 to 1.5V, and the value range of the recessive level (high level) is generally 1.5V to 5V, thus, by setting the supply voltage range of the first power supply terminal A_VDD5_COM and the second power supply terminal B_VDD5_COM to [3V, 5V], it is easier to distinguish whether the receiving end RX1 of the first communication node 200 and the receiving end RX2 of the second communication node 300 are high or low.
[0036] In some exemplary embodiments, the resistance range of the first pull-up resistor R1 and the second pull-up resistor R2 is [10 kΩ, 20 kΩ]. Thus, by setting the resistance range of the first pull-up resistor R1 and the second pull-up resistor R2 to [10 kΩ, 20 kΩ], it is possible to ensure that the first pull-up resistor R1 and the second pull-up resistor R2 can bear the role of voltage drop, thereby effectively preventing short circuits, and also effectively preventing the occurrence of leakage current in the first communication node 200 and the second communication node 300.
[0037] In some exemplary embodiments, the first dual-channel diode D1 is disposed close to the first communication node 200, and the second dual-channel diode D2 is disposed close to the second communication node 300. Since the communication connection line between the two communication nodes in the board is long, parasitic capacitance will be generated on the internal connection line of the board, affecting the signal quality. Therefore, by disposing the first dual-channel diode D1 close to the first communication node 200, more signal lines in the board can be lines of the "pushpull" output structure (push-pull output structure) configured by the transmitting end TX1 of the first communication node 200, and the lines of the "open drain" output structure (open drain output structure) equivalent to the first dual-channel diode D1 and the first pull-up resistor R1 are greatly shortened, thereby enhancing the robustness of CAN signal communication and improving the reception quality of CAN signals. Similarly, by setting the second dual-channel diode D2 close to the second communication node 300, more signal routing in the board can be the routing of the "push pull" output structure (push-pull output structure) configured by the transmitting end TX2 of the second communication node 300, while the routing of the "opendrain" output structure (open drain output structure) equivalent to the second dual-channel diode D2 and the second pull-up resistor R2 is greatly shortened, thereby enhancing the robustness of CAN signal communication and improving the reception quality of CAN signals.
[0038] The specific working principle of the intra-board communication circuit 100 provided by the utility model is as follows: when the transmitting end TX1 of the first communication node 200 starts to send a signal, if the transmitting end TX1 of the first communication node 200 sends a low level (the level of the sending point A is 0V), due to the forward conduction of the first dual-channel diode D1 and the second dual-channel diode D2, the levels of the receiving point A and the receiving point B are also pulled down (the levels of the receiving point A and the receiving point B are 0V), thereby ensuring that the level state of the receiving end RX1 of the first communication node 200, the receiving end RX2 of the second communication node 300 and the transmitting end TX1 of the first communication node 200 are consistent, all of which are low levels, and at the same time, the first pull-up resistor R1 and the second pull-up resistor R2 bear a voltage drop (for example, a 5V voltage drop) to prevent a short circuit; if the first communication node 20 0 sends a high level (the level of the sending point A is a high level, for example, 5V). Since the first dual-channel diode D1 and the second dual-channel diode D2 cannot be forward-conducted, the level of the receiving point A is consistent with the power supply voltage provided by the first power supply terminal A_VDD5_COM, and the level of the receiving point B is consistent with the power supply voltage provided by the second power supply terminal B_VDD5_COM (that is, the levels of the receiving point A and the receiving point B are both high levels, for example, 5V), thereby ensuring that the level state of the receiving end RX1 of the first communication node 200 and the receiving end RX2 of the second communication node 300 are consistent with the level state of the sending end TX1 of the first communication node 200, and are all high levels, thereby ensuring that the first communication node 200 can be used as a master node to send CAN signals to the second communication node 300.Similarly, when the transmitting end TX2 of the second communication node 300 starts to send a signal, if the transmitting end TX2 of the second communication node 300 sends a low level (the level of the sending point B is 0V), due to the forward conduction of the first dual-channel diode D1 and the second dual-channel diode D2, the levels of the receiving point A and the receiving point B are also pulled down (the levels of the receiving point A and the receiving point B are 0V), thereby ensuring that the level states of the receiving end RX1 of the first communication node 200, the receiving end RX2 of the second communication node 300 and the transmitting end TX2 of the second communication node 300 are consistent, all of which are low levels. At the same time, the first pull-up resistor R1 and the second pull-up resistor R2 bear the voltage drop (for example, a 5V voltage drop) to prevent short circuit; if the transmitting end TX2 of the second communication node 300 sends a High level (the level of sending point A is high level, for example, 5V). Since the first dual-channel diode D1 and the second dual-channel diode D2 cannot be forward-conducted, the level of receiving point A is consistent with the power supply voltage provided by the first power supply terminal A_VDD5_COM, and the level of receiving point B is consistent with the power supply voltage provided by the second power supply terminal B_VDD5_COM (that is, the levels of receiving point A and receiving point B are both high levels, for example, 5V), thereby ensuring that the level states of the receiving end RX1 of the first communication node 200, the receiving end RX2 of the second communication node 300 and the transmitting end TX2 of the second communication node 300 are consistent, all of which are high levels, thereby ensuring that the second communication node 300 can act as a master node to send CAN signals to the first communication node 200.
[0039] The utility model also provides an intra-board communication device, please refer to Figure 1 ,like Figure 1As shown, the intra-board communication device provided by the utility model includes a first communication node 200, a second communication node 300 and the intra-board communication circuit 100 as described in any one of the above items, the transmitting end TX1 of the first communication node 200 is connected to the first negative terminal 112 and the third negative terminal 132, the receiving end RX1 of the first communication node 200 is connected to the first positive terminal 111, the transmitting end TX2 of the second communication node 300 is connected to the second negative terminal 113 and the fourth negative terminal 133, and the receiving end RX2 of the second communication node 300 is connected to the second positive terminal 131. Therefore, the intra-board communication device provided by the utility model can realize that when the transmitting end TX1 of the first communication node 200 or the transmitting end TX2 of the second communication node 300 sends a low-level signal, the receiving end RX1 of the first communication node 200 and the receiving end RX2 of the second communication node 300 are both low-level (that is, the receiving end RX1 of the first communication node 200 and the receiving end RX2 of the second communication node 300 receive both low-level signals), and when the transmitting end TX1 of the first communication node 200 or the transmitting end TX2 of the second communication node 300 sends a high-level signal When the signal is received, the receiving end RX1 of the first communication node 200 and the receiving end RX2 of the second communication node 300 are both at high level (that is, the receiving end RX1 of the first communication node 200 and the receiving end RX2 of the second communication node 300 receive both high level signals), thereby ensuring that the level state of the receiving end can be consistent with the level state of the sending end, so that the master-slave communication between the two communication nodes can be realized without the need for a CNA communication chip, thereby not only eliminating the use of a CAN communication chip, saving space and cost for hardware layout, but also meeting the functional safety requirements of ASIL D, and having a higher communication rate. In addition, the utility model adopts the first dual-channel diode D1 and the second dual-channel diode D2, which not only ensures that the signal sent by each communication node can be received and mutually verified by the communication node itself and another communication node, but also ensures that when one of the diode channels of any one of the first dual-channel diode D1 and the second dual-channel diode D2 fails, the interactive communication between the first communication node 200 and the second communication node 300 can still be realized.
[0040] Please continue to refer to Figure 1 ,like Figure 1As shown, in some exemplary embodiments, the first communication node 200 includes a first micro control unit A_MCU, and the second communication node 300 includes a second micro control unit B_MCU. It should be noted that, as can be understood by those skilled in the art, the first communication node 200 may include an SBC (system basis chip) and a pre-driver (pre-driver) in addition to the first micro control unit A_MCU, and similarly, the second communication node 300 may include an SBC (system basis chip) and a pre-driver (pre-driver) in addition to the second micro control unit B_MCU.
[0041] In some exemplary embodiments, the transmitting end TX1 of the first communication node 200 and the transmitting end TX2 of the second communication node 300 are both configured with a push-pull output structure. Since the biggest feature of the push-pull output structure is that it can truly output high level and low level, and has driving capability at both levels, thus, by configuring the push-pull output structure at the transmitting end TX1 of the first communication node 200 and the transmitting end TX2 of the second communication node 300, the authenticity of the CAN signals sent by the first communication node 200 and the second communication node 300 can be effectively guaranteed, and distortion can be effectively reduced.
[0042] The utility model also provides a controller, and the controller includes any of the above-mentioned intra-board communication devices. Since the controller provided by the utility model includes the intra-board communication device provided by the utility model, the controller provided by the utility model at least has all the beneficial effects of the intra-board communication device provided by the utility model. For details, reference can be made to the above description of the beneficial effects of the intra-board communication device provided by the utility model, so the beneficial effects of the controller provided by the utility model will not be described one by one here.
[0043] The present invention also provides a vehicle, the vehicle comprising the controller described above. Since the vehicle provided by the present invention comprises the controller provided by the present invention, and the controller provided by the present invention comprises the in-board communication device provided by the present invention, the vehicle provided by the present invention also has at least all the beneficial effects of the in-board communication device provided by the present invention. For details, reference may be made to the above description of the beneficial effects of the in-board communication device provided by the present invention, so the beneficial effects of the vehicle provided by the present invention will not be described one by one here.
[0044] In summary, compared with the prior art, the intra-board communication circuit 100, the intra-board communication device, the controller and the vehicle provided by the present invention have the following beneficial effects:
[0045] The utility model can realize that when the transmitting end TX1 of the first communication node 200 or the transmitting end TX2 of the second communication node 300 sends a low-level signal, the receiving end RX1 of the first communication node 200 and the receiving end RX2 of the second communication node 300 are both low-level (that is, the receiving end RX1 of the first communication node 200 and the receiving end RX2 of the second communication node 300 receive both low-level signals), and when the transmitting end TX1 of the first communication node 200 or the transmitting end TX2 of the second communication node 300 sends a high-level signal, the receiving end RX1 of the first communication node 200 and the receiving end RX2 of the second communication node 300 are both high-level (that is, the receiving end RX1 of the first communication node 200 and the receiving end RX2 of the second communication node 300 receive both high-level signals), thereby ensuring that the level state of the receiving end can be consistent with the level state of the transmitting end, so that master-slave communication between the two communication nodes can be realized without the need for a CNA communication chip, thereby not only eliminating the use of a CAN communication chip, saving space and cost for hardware layout, but also meeting ASIL D's functional safety requirements, and has a higher communication rate. In addition, the utility model can not only ensure that the signal sent by each communication node can be received and mutually verified by the communication node itself and another communication node by adopting the first dual-channel diode D1 and the second dual-channel diode D2, but also ensure that when one of the diode channels of any one of the first dual-channel diode D1 and the second dual-channel diode D2 fails, the interactive communication between the first communication node 200 and the second communication node 300 can still be achieved.
[0046] It should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0047] It should also be noted that the above description is only a description of the preferred embodiment of the utility model, and is not any limitation on the scope of the utility model. Any changes and modifications made by ordinary technicians in the field of the utility model based on the above disclosure are within the scope of protection of the utility model. Obviously, technicians in this field can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations fall within the scope of the utility model and its equivalent technology, the utility model is also intended to include these modifications and variations.
Claims
1. An intra-board communication circuit, used to implement intra-board communication between a first communication node and a second communication node, characterized in that: The intra-board communication circuit includes a first dual-channel diode, a first pull-up resistor, a second dual-channel diode, and a second pull-up resistor; The first dual-channel diode includes a first positive terminal, a first negative terminal, and a second negative terminal, and the second dual-channel diode includes a second positive terminal, a third negative terminal, and a fourth negative terminal; A first end of the first pull-up resistor is connected to a first power supply terminal, a second end of the first pull-up resistor is connected to the first positive terminal, a first end of the second pull-up resistor is connected to a second power supply terminal, a second end of the second pull-up resistor is connected to the second positive terminal, and a supply voltage of the first power supply terminal is the same as a supply voltage of the second power supply terminal; The first negative terminal and the third negative terminal are configured to be connected to a transmitting end of the first communication node, and the first positive terminal is configured to be connected to a receiving end of the first communication node; The second negative terminal and the fourth negative terminal are configured to be connected to a transmitting end of the second communication node, and the second positive terminal is configured to be connected to a receiving end of the second communication node.
2. The intra-board communication circuit according to claim 1, characterized in that: The supply voltage range of the first power supply terminal and the second power supply terminal is [3V, 5V].
3. The intra-board communication circuit according to claim 1, characterized in that: The resistance range of the first pull-up resistor and the second pull-up resistor is [10 kΩ, 20 kΩ].
4. The intra-board communication circuit according to claim 1, characterized in that: The first dual-channel diode is disposed close to the first communication node, and the second dual-channel diode is disposed close to the second communication node.
5. An intra-board communication device, characterized in that: It includes a first communication node, a second communication node and an intra-board communication circuit as described in any one of claims 1 to 4, the transmitting end of the first communication node is connected to the first negative terminal and the third negative terminal, the receiving end of the first communication node is connected to the first positive terminal, the transmitting end of the second communication node is connected to the second negative terminal and the fourth negative terminal, and the receiving end of the second communication node is connected to the second positive terminal.
6. The intra-board communication device according to claim 5, characterized in that: The first communication node includes a first micro control unit, and the second communication node includes a second micro control unit.
7. The intra-board communication device according to claim 5, characterized in that: The transmitting end of the first communication node and the transmitting end of the second communication node are both configured with a push-pull output structure.
8. A controller, characterized in that: The invention comprises the intra-board communication device according to any one of claims 5 to 7.
9. A vehicle, characterized in that: Comprising the controller as claimed in claim 8.