Communication system of vehicle and vehicle

Abstract

The utility model provides a communication system of a vehicle and the vehicle, the communication system comprises a first controller and a second controller of the vehicle, the first controller and the second controller are both connected to a high-voltage wire harness of the vehicle; the first controller is used for modulating data to be transmitted, generating a power line carrier signal and transmitting the power line carrier signal to the second controller through the high-voltage wire harness; and the second controller is used for receiving the power line carrier signal through the high-voltage wire harness and demodulating the power line carrier signal to obtain the data to be transmitted. According to the communication system, the power line carrier communication between the controllers of the vehicle can be realized through the high-voltage wiring harness, and the high-voltage wiring harness is very thick and hard to damage, so that the robustness of realizing the power line carrier communication between the controllers in the vehicle through the high-voltage wiring harness is high.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and more particularly, to a vehicle communication system and a vehicle in the field of vehicles. Background Art

[0002] The high-voltage power system of new energy vehicles generally uses CAN (Controller Area Network) for communication between high-voltage parts. The physical carrier of the CAN network is two low-voltage signal lines used for voltage differential. It is packaged in the low-voltage wiring harness of the vehicle together with the low-voltage power supply (12V) line and connected to each controller through a low-voltage connector.

[0003] However, low-voltage connectors and low-voltage wiring harnesses are relatively thin and light, and are mostly covered with plastic. There are possibilities that the wiring harness may be cut, the insulation may be damaged, the copper core wire may be exposed, and the low-voltage connector may become loose, which may easily affect CAN communication and cause low robustness. Utility Model Content

[0004] The present application provides a vehicle communication system and a vehicle, wherein the communication system can realize power line carrier communication between vehicle controllers through a high-voltage wire harness, and the high-voltage wire harness itself is very thick and not easily damaged, and has high robustness.

[0005] In a first aspect, a vehicle communication system is provided, comprising: a first controller and a second controller of the vehicle, wherein the first controller and the second controller are both connected to a high-voltage wire harness of the vehicle; the first controller is used to modulate data to be transmitted, generate a power line carrier signal, and transmit the power line carrier signal to the second controller through the high-voltage wire harness; the second controller is used to receive the power line carrier signal through the high-voltage wire harness, and demodulate the power line carrier signal to obtain the data to be transmitted.

[0006] In the above technical solution, power line carrier communication is applied to the data interaction between the controllers of the vehicle, so as to realize the data transmission between the controllers through the high-voltage wire harness as a carrier. The high-voltage wire harness on the vehicle is relatively thick, and is properly arranged for high-voltage safety reasons, so the safety and robustness are much higher than CAN communication. Once the high-voltage wire harness is cut off, the high-voltage power system will not have the conditions to work, and the communication will be interrupted, so the scenarios of the two are overlapping. At the same time, the bandwidth and communication cycle of power line carrier communication are much stronger than CAN communication, which provides a basis for the further development of the functions of the high-voltage power system.

[0007] In combination with the first aspect, in some possible implementations, the first controller includes: a first main control module and a first carrier communication module, and the second controller includes a second main control module and a second carrier communication module; the first main control module is used to modulate the data to be transmitted, generate a power line carrier signal, and send the power line carrier signal to the first carrier communication module; the first carrier communication module is used to send the power line carrier signal to the second carrier communication module through the high-voltage wire harness; the second carrier communication module is used to send the power line carrier signal to the second main control module; the second main control module is used to demodulate the power line carrier signal to obtain the data to be transmitted.

[0008] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the first controller also includes: a first isolation coil, the first end and the second end of the first isolation coil are connected to the first carrier communication module, the third end of the first isolation coil is connected to the first end of the high-voltage wire harness, and the fourth end of the first isolation coil is connected to the second end of the high-voltage wire harness; the second controller also includes: a second isolation coil, the first end and the second end of the second isolation coil are connected to the second carrier communication module, the third end of the second isolation coil is connected to the first end of the high-voltage wire harness, and the fourth end of the second isolation coil is connected to the second end of the high-voltage wire harness; the first end of the high-voltage wire harness is connected to the positive electrode of the battery module, and the second end of the high-voltage wire harness is connected to the negative electrode of the battery module; the first isolation coil is used to electrically isolate the first carrier communication module from the high-voltage wire harness and transmit the power line carrier signal sent by the first carrier communication module; the second isolation coil is used to electrically isolate the second carrier communication module from the high-voltage wire harness and transmit the power line carrier signal to the second carrier communication module.

[0009] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the first controller also includes: a first capacitor, and the third end of the first isolation coil is connected to the first end of the high-voltage wire harness through the first capacitor; the second controller also includes: a second capacitor, and the fourth end of the second isolation coil is connected to the second end of the high-voltage wire harness through the second capacitor; the first capacitor is used to isolate the DC component and transmit the power line carrier signal belonging to the AC component to the high-voltage wire harness through the first capacitor; the second capacitor is used to isolate the DC component and transmit the power line carrier signal belonging to the AC component to the second isolation coil through the second capacitor.

[0010] In combination with the first aspect and the above implementations, in some possible implementations, the first carrier communication module is a first PLC communication chip, and the second carrier communication module is a second PLC communication chip.

[0011] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the first main control module and the first carrier communication module are connected through a first communication interface, and the second main control module and the second carrier communication module are connected through a second communication interface; the first main control module is specifically used to send the power line carrier signal to the first carrier communication module through the first communication interface; the second carrier communication module is specifically used to send the power line carrier signal to the second main control module through the second communication interface.

[0012] In combination with the first aspect and the above implementations, in some possible implementations, the first communication interface is a serial peripheral interface or an Ethernet interface, and the second communication interface is a serial peripheral interface or an Ethernet interface.

[0013] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, the first controller is specifically used to modulate the data to be transmitted to generate a power line carrier signal of a target frequency band; the second controller is specifically used to determine that the power line carrier signal is sent by the first controller by identifying the target frequency band.

[0014] In combination with the first aspect and the above implementations, in some possible implementations, there are multiple first controllers, and the target frequency band of the power line carrier signal generated by each first controller is different.

[0015] In a second aspect, a vehicle is provided, comprising the communication system of the vehicle in the first aspect or any possible implementation of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of CAN communication in the prior art.

[0017] Figure 2 It is a schematic diagram of a vehicle communication system provided in an embodiment of the present application.

[0018] Figure 3 It is a schematic diagram of another vehicle communication system provided in an embodiment of the present application.

[0019] Figure 4 It is a schematic diagram of another vehicle communication system provided in an embodiment of the present application.

[0020] Figure 5 It is a schematic diagram of another vehicle communication system provided in an embodiment of the present application.

[0021] Figure 6 It is a schematic diagram of the structure of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0023] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0024] The high-voltage power system of new energy vehicles generally uses the CAN network for communication between high-voltage parts. The physical carrier of the CAN network is two low-voltage signal lines used for voltage differential. It is packaged in the low-voltage wiring harness of the vehicle together with the low-voltage power supply (12V) line and connected to each controller through a low-voltage connector. Figure 1 As shown in the figure, the drive control system of new energy vehicles mainly includes: battery controller, motor controller, vehicle controller and electronic accelerator pedal. They mainly use CAN communication to realize control interaction, and these controllers are powered by low-voltage (12V) wiring harnesses. CAN communication and power supply are both realized through low-voltage wiring harnesses and low-voltage connectors.

[0025] However, low-voltage connectors and low-voltage wiring harnesses are relatively thin and light, and are mostly covered with plastic. There are possibilities that the wiring harness may be cut, the insulation may be damaged, the copper core wire may be exposed, and the low-voltage connector may become loose, which may easily affect CAN communication and cause low robustness.

[0026] Based on this, an embodiment of the present application provides a vehicle communication system, which applies power line carrier communication to data interaction between vehicle controllers, so as to realize data transmission between controllers by using high-voltage wire harness as a carrier.

[0027] Power line carrier communication is a communication mode applied to power systems or industrial equipment. It can use high-voltage wires as carriers to transmit information through high-frequency differential signals. In the automotive field, power line carrier communication is used as a communication protocol for standard charging in Europe and the United States, so power line carrier communication components that meet automotive standards have begun to appear in recent years. However, power line carrier communication for charging applications is arranged on low-voltage signal lines, and power line carrier communication has not yet been applied to high-voltage wiring harnesses for vehicles.

[0028] In the embodiment of the present application, the communication method of power line carrier communication is applied to the high-voltage wire harness. The high-voltage wire harness on the vehicle is relatively thick, and is properly arranged for high-voltage safety reasons, so the safety and robustness are much higher than CAN communication. Once the high-voltage wire harness is cut off, the high-voltage power system will not have the conditions to work, and the communication will be interrupted, so the two scenarios overlap. At the same time, the bandwidth and communication cycle of power line carrier communication are much stronger than CAN communication, which provides a basis for the further development of the functions of the high-voltage power system.

[0029] Figure 2 It is a schematic diagram of a vehicle communication system provided in an embodiment of the present application.

[0030] For example, Figure 2 As shown, the communication system includes: a first controller 21 and a second controller 22 in the vehicle, and the first controller 21 and the second controller 22 are both connected to a high-voltage wire harness 23 of the vehicle.

[0031] The first controller 21 is used for modulating the data to be transmitted, generating a power line carrier signal, and transmitting the power line carrier signal to the second controller 22 through the high-voltage wire harness 23 .

[0032] The second controller 22 is used to receive the power line carrier signal through the high-voltage wire harness 23, and demodulate the power line carrier signal to obtain data to be transmitted.

[0033] Among them, the first controller 21 and the second controller 22 can be controllers in the vehicle that need to communicate data. The controllers that need to communicate data may include: vehicle controller, battery controller, motor controller, body controller, engine controller, gearbox controller and other controllers. In this embodiment, the first controller 21 is a controller that sends data and the second controller 22 is a controller that receives data. In a specific implementation, the first controller 21 can also be used as a controller that receives data and the second controller 22 can also be used as a controller that sends data.

[0034] It is understandable that if the first controller 21 or the second controller 22 itself is a high-voltage component, the first controller 21 or the second controller 22 itself is connected to the high-voltage wire harness. If the first controller 21 or the second controller 22 itself is a low-voltage component, the first controller 21 or the second controller 22 can be connected to the high-voltage wire harness through a wire.

[0035] The high-voltage harness 23 refers to the general term for the harness used to transmit high-voltage electric energy on the whole vehicle, and the high-voltage harness 23 starts from the battery module 24. The battery module 24 is composed of chemical battery cells packaged together. Lithium-ion cells are mostly used on vehicles. Relying on the support structure and cell poles of the battery module, copper bars are welded or screwed to the battery to form a certain series-parallel structure. Outside the battery module, the modules are also screwed in series through copper bars to form the voltage required by the vehicle.

[0036] The first end of the first controller 21 is connected to the positive output high voltage harness of the battery module 24 through the positive wire U+, and the second end of the first controller 21 is connected to the negative output high voltage harness of the battery module 24 through the negative wire U-.

[0037] The first end of the second controller 22 is connected to the high-voltage wiring harness of the positive output end of the battery module 24 through the positive wire U+, and the second end of the second controller 22 is connected to the high-voltage wiring harness of the negative output end of the battery module 24 through the negative wire U-.

[0038] The first controller 21 and the second controller 22 both have the function of modulating and demodulating data. The first controller 21 modulates the data to be transmitted according to the modulation and demodulation technology, generates a power line carrier signal, and transmits the power line carrier signal to the high-voltage wire harness 23. The second controller 22 receives the power line carrier signal from the high-voltage wire harness 23, and demodulates the power line carrier signal according to the modulation and demodulation technology to obtain the data to be transmitted.

[0039] The data to be transmitted is the data that the first controller 21 wants to transmit to the second controller 22. For example, if the first controller 21 is a battery controller and the second controller 22 is a motor controller, the data transmitted by the battery controller to the motor controller may include: the current remaining power of the battery module, the terminal voltage of the battery module, etc. If the first controller 21 is a motor controller and the second controller 22 is a battery controller, the data transmitted by the motor controller to the battery controller may include: the motor terminal voltage, the motor terminal current, the motor system status, etc.

[0040] Exemplarily, the first controller 21 is specifically used to modulate the data to be transmitted to generate a power line carrier signal of a target frequency band; the second controller 22 is specifically used to determine that the power line carrier signal is sent by the first controller by identifying the target frequency band.

[0041] The target frequency band is specially set for the first controller, and is intended to identify the power line carrier signal sent by the first controller, so that the second controller receiving the power line carrier signal of the target frequency band can clearly identify that the power line carrier signal comes from the first controller.

[0042] It is understandable that the high-voltage wire harness 23 may transmit communication data between different controllers. In order to avoid interference between power line carrier signals sent by different controllers, specific frequency bands can be set for different controllers so that different controllers send power line carrier signals of specific frequency bands. For example, as described above, the first controller 21 modulates the data to be transmitted, generates a power line carrier signal of the target frequency band, and then transmits the power line carrier signal of the target frequency band to the second controller 22 through the high-voltage wire harness 23. The second controller 22 can determine that the power line carrier signal is sent by the first controller 21 by identifying the target frequency band.

[0043] Exemplarily, there are multiple first controllers, and the target frequency band of the power line carrier signal generated by each first controller is different. For example, the first controller includes: a battery controller and a motor controller, and the second controller includes a vehicle controller. The target frequency band for the battery controller can be defined as 50kHz-100kHz, and the target frequency band for the motor controller can be defined as 150kHz-200kHz. When the vehicle controller receives a power line carrier signal in the frequency band of 50kHz-100kHz, it can be determined that it is a signal sent by the battery controller. If it receives a signal in the frequency band of 150kHz-200kHz, it can be determined that it is information sent by the motor controller, thereby avoiding the difficulty of the vehicle controller to identify the power line carrier signal of the same frequency band sent by the motor controller and the battery controller.

[0044] Figure 3 It is a schematic diagram of another vehicle communication system provided in an embodiment of the present application.

[0045] For example, Figure 3 As shown, the first controller 21 includes: a first main control module 210 and a first carrier communication module 211 , and the second controller 22 includes a second main control module 220 and a second carrier communication module 221 .

[0046] The first main control module 210 is used for modulating the data to be transmitted, generating a power line carrier signal, and sending the power line carrier signal to the first carrier communication module 211 .

[0047] The first carrier communication module 211 is used to send the power line carrier signal to the second carrier communication module 221 through the high-voltage wire harness 23 .

[0048] The second carrier communication module 221 is used to send the power line carrier signal to the second main control module 220 .

[0049] The second main control module 220 is used to demodulate the power line carrier signal to obtain data to be transmitted.

[0050] The first main control module 210 is the main control chip of the first controller 21, which can be a single-chip microcomputer. The single-chip microcomputer in the first controller 21 can control the signal to be in a specific frequency band. For example, the single-chip microcomputer in the battery controller can send a power line carrier signal in the frequency band of 50kHz-100kHz, and the single-chip microcomputer in the motor controller can send a power line carrier signal in the frequency band of 150kHz-200kHz.

[0051] The second main control module 220 is the main control chip of the second controller 22, which can be a single-chip microcomputer. The single-chip microcomputer in the second controller 21 can identify the frequency band of the received power line carrier signal to determine which controller sent the power line carrier signal, and can also demodulate the power line carrier signal to obtain the data to be transmitted sent by the first controller. For example, in combination with the above example, after the single-chip microcomputer in the vehicle controller receives the power line carrier signal in the 50kHz-100kHz frequency band, it can determine that the power line carrier signal is sent by the battery controller based on the 50kHz-100kHz frequency band. After the single-chip microcomputer in the vehicle controller receives the power line carrier signal in the 150kHz-200kHz frequency band, it can determine that the power line carrier signal is sent by the motor controller based on the 150kHz-200kHz frequency band.

[0052] The first carrier communication module 211 and the second carrier communication module 221 are transceiver devices specifically used for power line carrier communication. Exemplarily, the first carrier communication module is a first PLC communication chip, and the second carrier communication module is a second PLC communication chip.

[0053] PLC (Power Line Communication) communication chip is an integrated circuit designed for data transmission through power cables, which enables data to be communicated bidirectionally on existing power lines without the need for additional dedicated data lines. It is widely used in smart grids, smart homes, remote control, automatic meter reading and billing, building automation, lighting control and other fields. In this embodiment, the PLC communication chip is set in the controller in the vehicle, so that the controllers in the vehicle, such as the first controller 21 and the second controller 22, can realize power line communication.

[0054] Exemplarily, the first main control module 210 and the first carrier communication module 211 are connected through a first communication interface, so that data communication can be performed between the first main control module 210 and the first carrier communication module 211 through the first communication interface. The second main control module 220 and the second carrier communication module 221 are connected through a second communication interface, so that data communication can be performed between the second main control module 220 and the second carrier communication module 221 through the second communication interface.

[0055] The first main control module 210 is specifically used to send the power line carrier signal to the first carrier communication module 211 through the first communication interface. The second carrier communication module 221 is specifically used to send the power line carrier signal to the second main control module 220 through the second communication interface.

[0056] Exemplarily, the first communication interface is a serial peripheral interface (SPI) or an Ethernet interface (Ethernet Interface), and the second communication interface is a serial peripheral interface SPI or an Ethernet interface Ethernet Interface.

[0057] Figure 4 It is a schematic diagram of another vehicle communication system provided in an embodiment of the present application.

[0058] For example, Figure 4 As shown, the first controller 21 also includes: a first isolation coil 41, the first end and the second end of the first isolation coil 41 are connected to the first carrier communication module 211, the third end of the first isolation coil 41 is connected to the first end of the high-voltage wire harness 23, and the fourth end of the first isolation coil 41 is connected to the second end of the high-voltage wire harness. The second controller 22 also includes: a second isolation coil 42, the first end and the second end of the second isolation coil 42 are connected to the second carrier communication module 221, the third end of the second isolation coil 42 is connected to the first end of the high-voltage wire harness 23, and the fourth end of the second isolation coil 42 is connected to the second end of the high-voltage wire harness 23. The first end of the high-voltage wire harness 23 is connected to the positive electrode of the battery module 24, and the second end of the high-voltage wire harness 23 is connected to the negative electrode of the battery module 24.

[0059] The first isolation coil 41 is used to electrically isolate the first carrier communication module 211 from the high-voltage wire harness 23, and transmit the power line carrier signal sent by the first carrier communication module 211. The second isolation coil 42 is used to electrically isolate the second carrier communication module 221 from the high-voltage wire harness 23, and transmit the power line carrier signal to the second carrier communication module 221.

[0060] In this embodiment, by providing the first isolation coil and the second isolation coil, it is beneficial to realize power line carrier communication between the first controller and the second controller through the high-voltage wire harness while avoiding the first controller and the second controller being affected by the high voltage of the high-voltage wire harness.

[0061] For example, Figure 4 As shown, the first controller 21 also includes: a first capacitor 43, and the third end of the first isolation coil 41 is connected to the first end of the high-voltage wiring harness through the first capacitor 43. Specifically, the first plate of the first capacitor 43 is connected to the third end of the first isolation coil 41, and the second plate of the first capacitor 43 is connected to the first end of the high-voltage wiring harness. The second controller 22 also includes: a second capacitor 44, and the fourth end of the second isolation coil 42 is connected to the second end of the high-voltage wiring harness 23 through the second capacitor 44. Specifically, the first plate of the second capacitor 44 is connected to the fourth end of the second isolation coil 42, and the second plate of the second capacitor 44 is connected to the second end of the high-voltage wiring harness.

[0062] The first capacitor 43 is used to isolate the DC component and transmit the power line carrier signal of the AC component transmitted from the first isolation coil 41 to the high-voltage wire harness 23 through the first capacitor 43. The second capacitor 44 is used to isolate the DC component and transmit the power line carrier signal of the AC component transmitted from the high-voltage wire harness 23 to the second isolation coil 42 through the second capacitor 44. The second isolation coil 42 transmits the power line carrier signal to the second carrier communication module 221, and the second carrier communication module 221 sends the power line carrier signal to the second main control module 220.

[0063] In this embodiment, the combination of the isolation coil and the capacitor ensures that the high voltage of the vehicle will not damage the low voltage control circuit, and power line carrier communication can be achieved by only collecting high-frequency AC signals (ie, power line carrier signals).

[0064] The following describes the communication system of the vehicle in the embodiment of the present application by taking the example that the first controller includes a battery controller and the second controller includes a motor controller:

[0065] like Figure 5 As shown, the communication system includes: a battery controller 50 , a motor controller 51 , a high-voltage wire harness 23 , and a battery module 24 .

[0066] The battery controller 50 includes: a single chip microcomputer 1, a PLC communication chip 1, an isolation coil 1, and a capacitor 1. The single chip microcomputer 1 is the main control chip of the battery controller 50, and the single chip microcomputer 1 interacts with the PLC communication chip 1 via SPI.

[0067] The isolation coil 1 is a device for isolating the PLC communication chip 1 from the high-voltage DC bus voltage of the vehicle and transmitting the AC voltage component of the high-voltage DC bus.

[0068] Capacitor 1 is a high-voltage component that isolates the DC component of the high-voltage DC bus of the entire vehicle and only allows the AC component to pass through. The combination of isolation coil 1 and capacitor 1 ensures that the high voltage of the entire vehicle will not damage the low-voltage control circuit of the battery controller 50, and only collects high-frequency AC signals to achieve power line carrier communication.

[0069] The high-voltage battery pack is an energy storage device for the vehicle. When the vehicle is running, the high-voltage battery pack releases DC power, and when the vehicle is charging, the high-voltage battery pack absorbs DC power. The high-voltage battery pack mainly includes: a battery module 24, a battery controller 50, and a bus circuit unit (not shown in the figure).

[0070] The battery module 24 is composed of chemical battery cells packaged together. Lithium-ion cells are mostly used in vehicles. Relying on the supporting structure and cell poles of the module, copper bars are welded or screwed to the battery to form a certain series-parallel structure. Outside the module, the modules are also screwed in series through copper bars to form the voltage required by new energy.

[0071] The battery controller 50 is divided into a master controller and a slave controller. The master controller is responsible for collecting the cell information sent by the slave controller and collecting the voltage and current data at the whole pack level. The master controller is also responsible for controlling the on and off of the relay and pre-charging circuit and the signal interaction of the whole vehicle. The slave controller is responsible for collecting the voltage and temperature of the cell and supporting the balance of the cell-related parameters.

[0072] The bus circuit unit physically integrates high-voltage components such as relays, pre-charging circuits, high-voltage connectors, fuses, etc.

[0073] The motor controller 51 includes: a single chip microcomputer 2, a PLC communication chip 2, an isolation coil 2, and a capacitor 2. The single chip microcomputer 2 is the main control chip of the battery controller 51, and the single chip microcomputer 2 interacts with the PLC communication chip 2 via SPI.

[0074] The isolation coil 2 is a device used to isolate the PLC communication chip 2 from the high-voltage DC bus voltage of the entire vehicle and to transmit the AC voltage component of the high-voltage DC bus.

[0075] Capacitor 2 is a high-voltage component that isolates the DC component of the high-voltage DC bus of the entire vehicle and only allows the AC component to pass through. The combination of isolation coil 2 and capacitor 2 ensures that the high voltage of the entire vehicle will not damage the low-voltage control circuit of the motor controller 51, and only collects high-frequency AC signals to achieve power line carrier communication.

[0076] The motor controller 51 is the control part of the motor system. It can determine the instantaneous state of the motor through the collected motor resolver, DC voltage and current, AC voltage and current, and control the semiconductor switch on the power module through the pre-drive circuit to achieve the purpose of controlling the motor. At the same time, it is also responsible for external communication, and the main communication objects are the motor and the vehicle controller.

[0077] The power module 52 is a power electronic actuator of the motor. It uses the current emitted by the pre-drive circuit of the motor controller as a switching instruction to perform the task of inverting the battery DC power into three-phase AC power. The three-phase AC power will serve as the driving energy and control signal of the motor.

[0078] The motor body 53 is a device that converts electrical energy into mechanical energy. It mainly includes a motor housing, a motor stator, a motor rotor, and a motor resolver. Its input is three-phase AC power, and its output is the rotational kinetic energy of the motor output shaft. The motor output shaft will be connected to the reducer and finally transmit the rotational kinetic energy to the wheels through the differential and the half shaft to drive the new energy vehicle.

[0079] like Figure 5 As shown, the data communication process between the battery controller 50 and the motor controller 51 is as follows:

[0080] The single-chip computer 1 modulates the data to be transmitted sent by the battery controller 50 to the motor controller 51, generates a power line carrier signal, and sends the power line carrier signal to the PLC communication chip 1 through SPI. The PLC communication chip 1 transmits the power line carrier signal to the high-voltage wire harness 23 through the isolation coil 1 and the capacitor 1. The power line carrier signal on the high-voltage wire harness 23 is transmitted to the PLC communication chip 2 through the capacitor 2 and the isolation coil 2. The PLC communication chip 2 sends the power line carrier signal to the single-chip computer 2 through SPI. The single-chip computer 2 demodulates the power line carrier signal to obtain the data to be transmitted sent by the battery controller 50 to the motor controller 51.

[0081] For example, if the motor controller 51 is to send data to be transmitted to the battery controller 50, the single-chip microcomputer 2 modulates the data to be transmitted that the motor controller 51 is to send to the battery controller 50, generates a power line carrier signal, and sends the power line carrier signal to the PLC communication chip 2 via SPI, and the PLC communication chip 2 transmits the power line carrier signal to the high-voltage wire harness 23 via the isolation coil 2 and the capacitor 2. The power line carrier signal on the high-voltage wire harness 23 is transmitted to the PLC communication chip 1 via the capacitor 1 and the isolation coil 1, and the PLC communication chip 1 sends the power line carrier signal to the single-chip microcomputer 1 via SPI, and the single-chip microcomputer 1 demodulates the power line carrier signal to obtain the data to be transmitted that the motor controller 51 is to send to the battery controller 50.

[0082] In this embodiment, a new communication method is provided for the high-voltage power system, and this communication is realized based on the high-voltage wire harness. The power line carrier communication can theoretically achieve a communication bandwidth of 30M / s, which has great potential compared to the commonly used 2M / s and 500k / s of CAN communication. In addition, the high-voltage wire harness and connector itself are very strong and not easily damaged. At the same time, due to the high-voltage safety reasons, they are properly protected in the layout when designing new energy vehicles, and the robustness is very high.

[0083] In some embodiments, such as considering the scenario where the power line carrier is the only communication carrier, the power domain controller solution formed by combining the high-voltage to low-voltage power supply chip and the electric drive system integrated vehicle controller can completely replace the low-voltage wiring harness and connectors inside the high-voltage power system, that is, cancel this part of the wiring harness and connectors of the whole vehicle. For example, a first high-voltage to low-voltage power supply chip is set in the first controller, and the first high-voltage to low-voltage power supply chip is connected in parallel with the battery module to convert the high voltage output of the battery module into a low voltage to power the first controller. A second high-voltage to low-voltage power supply chip is set in the second controller, and the second high-voltage to low-voltage power supply chip is connected in parallel with the battery module to convert the high voltage output of the battery module into a low voltage to power the second controller.

[0084] In some embodiments, such as considering the scenario of mixed application of power line carrier communication and CAN communication, the problem of functional safety redundancy not being independently decoupled in communication can be solved, making the functional safety measures more thorough. Power line carrier communication can cover the high-voltage interlocking function. As long as the high-voltage connector is disconnected, the power line carrier communication is interrupted, and the whole vehicle can quickly execute the power-off process. Compared with the traditional high-voltage interlocking, it has the advantage of not being easily triggered by mistake, and at the same time reduces the low-voltage detection network required for the traditional high-voltage interlocking on the vehicle.

[0085] The vehicle provided in this embodiment is as follows: Figure 6 As shown, the vehicle 600 includes the above-mentioned vehicle communication system 601, and the communication system 601 can be the vehicle communication system mentioned in any of the above-mentioned embodiments. Using the vehicle 600 can achieve the same effect as using the above-mentioned vehicle communication system.

[0086] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the system can be divided into different functional modules to complete all or part of the functions described above.

[0087] In the embodiments provided in the present application, it should be understood that the disclosed systems and vehicles can be implemented in other ways. For example, the system embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0088] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A vehicle communication system, characterized in that: include: A first controller and a second controller of a vehicle, wherein the first controller and the second controller are both connected to a high-voltage wiring harness of the vehicle; The first controller is used to modulate the data to be transmitted, generate a power line carrier signal, and transmit the power line carrier signal to the second controller through the high-voltage wire harness; The second controller is used to receive the power line carrier signal through the high-voltage wire harness and demodulate the power line carrier signal to obtain the data to be transmitted.

2. The system according to claim 1, characterized in that The first controller includes: a first main control module and a first carrier communication module, and the second controller includes a second main control module and a second carrier communication module; The first main control module is used to modulate the data to be transmitted, generate a power line carrier signal, and send the power line carrier signal to the first carrier communication module; The first carrier communication module is used to send the power line carrier signal to the second carrier communication module through the high-voltage wire harness; The second carrier communication module is used to send the power line carrier signal to the second main control module; The second main control module is used to demodulate the power line carrier signal to obtain the data to be transmitted.

3. The system according to claim 2, characterized in that The first controller further includes: a first isolation coil, wherein a first end and a second end of the first isolation coil are connected to the first carrier communication module, a third end of the first isolation coil is connected to a first end of the high-voltage wire harness, and a fourth end of the first isolation coil is connected to a second end of the high-voltage wire harness; The second controller further includes: a second isolation coil, wherein a first end and a second end of the second isolation coil are connected to the second carrier communication module, a third end of the second isolation coil is connected to the first end of the high-voltage wire harness, and a fourth end of the second isolation coil is connected to the second end of the high-voltage wire harness; The first end of the high-voltage wire harness is connected to the positive electrode of the battery module, and the second end of the high-voltage wire harness is connected to the negative electrode of the battery module; The first isolation coil is used to electrically isolate the first carrier communication module from the high-voltage wire harness and transmit the power line carrier signal sent by the first carrier communication module; The second isolation coil is used to electrically isolate the second carrier communication module from the high-voltage wire harness and transmit the power line carrier signal to the second carrier communication module.

4. The system according to claim 3, characterized in that The first controller further includes: a first capacitor, through which the third end of the first isolation coil is connected to the first end of the high-voltage wire harness; the second controller further includes: a second capacitor, through which the fourth end of the second isolation coil is connected to the second end of the high-voltage wire harness; The first capacitor is used to isolate the DC component and transmit the power line carrier signal belonging to the AC component to the high-voltage wire harness through the first capacitor; The second capacitor is used to isolate the DC component and transmit the power line carrier signal belonging to the AC component to the second isolation coil through the second capacitor.

5. The system according to claim 2, characterized in that The first carrier communication module is a first PLC communication chip, and the second carrier communication module is a second PLC communication chip.

6. The system according to claim 2, characterized in that The first main control module and the first carrier communication module are connected via a first communication interface, and the second main control module and the second carrier communication module are connected via a second communication interface; The first main control module is specifically configured to send the power line carrier signal to the first carrier communication module through the first communication interface; The second carrier communication module is specifically configured to send the power line carrier signal to the second main control module through the second communication interface.

7. The system according to claim 6, characterized in that The first communication interface is a serial peripheral interface or an Ethernet interface, and the second communication interface is a serial peripheral interface or an Ethernet interface.

8. The system according to claim 1, characterized in that The first controller is specifically used to modulate the data to be transmitted to generate a power line carrier signal of a target frequency band; The second controller is specifically configured to determine that the power line carrier signal is sent by the first controller by identifying the target frequency band.

9. The system according to claim 8, characterized in that There are multiple first controllers, and the target frequency band of the power line carrier signal generated by each first controller is different.

10. A vehicle, characterized in that: The vehicle comprises the vehicle communication system according to any one of claims 1 to 9 above.

Images