Simulation system
By connecting PCIe and CPCIe connection boards in the simulation system, the long-distance transmission of optical signals is achieved, which solves the serious problem of PCIe signal attenuation and expands the environment construction scope of hardware in-loop simulation testing.
Patent Information
- Application Number
- CN202421932621.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-08-09
AI Technical Summary
The existing method has severely decayed when the transmission distance increases, and the limited transmission distance limits the hardware construction in the environment for ring simulation testing.
By connecting the PCIe connection board with the CPCIe connection board in the simulation system, the long-distance transmission of optical signals between the connection boards is achieved.
It significantly improves the signal transmission distance, solves the serious problem of PCIe signal attenuation, and expands the construction scope of hardware in-loop simulation testing environment.
Smart Images
Figure CN222867079U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of simulation electronic technology, and in particular to a simulation system. Background Art
[0002] Peripheral Component Interconnect Express (PCIe) is a high-speed serial computer expansion bus standard characterized by point-to-point communication, fast speed, high bandwidth, and strong scalability.
[0003] In the hardware-in-the-loop test of automotive electronic controllers, it is generally necessary to expand multiple PCIe devices. Currently, the PCIe bus is generally integrated into the backplane module of the expansion chassis through the PCIe Switch chip, and then expanded to multiple PCIe endpoint interfaces. Copper cables are used as the transmission medium between the expansion chassis and the real-time simulator to realize electrical signal transmission.
[0004] However, the existing method suffers from severe PCIe signal attenuation when the transmission distance increases, and the limited transmission distance restricts the environment establishment of hardware-in-the-loop simulation testing. Utility Model Content
[0005] In this regard, the present application provides a simulation system to solve the problem that the existing method suffers from severe PCIe signal attenuation when the transmission distance increases, and the limited transmission distance restricts the environment establishment of hardware-in-the-loop simulation testing.
[0006] To achieve the above objectives, the present application provides the following technical solutions:
[0007] The application discloses a simulation system, comprising: a real-time simulation machine and an expansion chassis;
[0008] The real-time simulation machine includes: a CPU and a PCIe connection board; the expansion chassis includes: a CPCIe connection board, a backplane and at least one IO module;
[0009] The PCIe connection board is connected to the CPCIe connection board by optical fiber; each of the IO modules is connected to a corresponding automotive electronic controller.
[0010] Optionally, in the above-mentioned simulation system, the PCIe connection board and the CPU are connected to each other in the form of a gold finger.
[0011] Optionally, in the above-mentioned simulation system, the CPU includes: a Root Complex module; the PCIe connection board includes: a first Redriver chip, a first optical transceiver module and a first optical fiber interface;
[0012] The Root Complex module is connected to the first Redriver chip, the first optical transceiver module and the first optical fiber interface in sequence through gold fingers.
[0013] Optionally, in the above-mentioned simulation system, the signal transmitted between the first Redriver chip and the first optical transceiver module is an electrical signal;
[0014] The signal transmitted between the first optical transceiver module and the first optical fiber interface is an optical signal.
[0015] Optionally, in the above-mentioned simulation system, the CPCIe connection board includes: a second optical fiber interface, a second optical transceiver module and a second Redriver chip;
[0016] The second optical transceiver module is connected to the second optical fiber interface and the second Redriver chip respectively.
[0017] Optionally, in the above-mentioned simulation system, the signal transmitted between the second optical fiber interface and the second optical transceiver module is an optical signal;
[0018] The signal transmitted between the second optical transceiver module and the second Redriver chip is an electrical signal.
[0019] Optionally, in the above-mentioned simulation system, the backplane includes: a PCIe Switch chip and at least one CPCIe downstream port, each CPCIe downstream port is connected to the corresponding IO module;
[0020] The PCIe Switch chip is connected to the second Redriver chip in the CPCIe connection board.
[0021] Optionally, in the above-mentioned simulation system, the CPCIe connection board and the backplane are connected via a high-speed backplane connector.
[0022] Optionally, in the above-mentioned simulation system, the upper limit of the length of the optical fiber cable between the PCIe connection board and the CPCIe connection board is 150m.
[0023] Optionally, in the above-mentioned simulation system, the simulation system is a distributed real-time simulation system.
[0024] The simulation system provided by the present application includes: a real-time simulation machine and an expansion chassis; the real-time simulation machine includes: a CPU and a PCIe connection board; the expansion chassis includes: a CPCIe connection board, a backplane and at least one IO module; the PCIe connection board is connected to the CPCIe connection board by optical fiber; each IO module is connected to a corresponding automotive electronic controller. The present application uses optical fiber cables as channels to realize long-distance transmission of optical signals between connection boards, which significantly improves the transmission distance of the signal and solves the problem that the existing method suffers from severe PCIe signal attenuation when the transmission distance increases, and the limited transmission distance limits the environment construction of hardware-in-the-loop simulation testing. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.
[0026] Figure 1 A schematic diagram of the structure of a simulation system provided in an embodiment of the present application. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0028] The embodiment of the present application provides a simulation system to solve the problem that the existing method suffers from severe PCIe signal attenuation when the transmission distance increases, and the limited transmission distance restricts the environment establishment of hardware-in-the-loop simulation testing.
[0029] See also Figure 1 The simulation system mainly includes: a real-time simulation machine and an expansion chassis (the real-time simulation machine expansion chassis in the figure); the real-time simulation machine includes: a CPU and a PCIe connection board; the expansion chassis includes: a CPCIe (CompactPCI Express) connection board, a backplane and at least one IO module; the PCIe connection board is connected to the CPCIe connection board by optical fiber; each IO module is connected to the corresponding automotive electronic controller (the ECU (Electronic Control Unit) under test in the figure).
[0030] In actual applications, the PCIe connection board and the CPU can be connected in the form of gold fingers, that is, Figure 1 As shown. Among them, the PCIe connection board can be an upstream PCIe connection board connected to the CPU, the backplane can be a backplane based on the PCIe communication bus, and the CPCIe connection board is a downstream connection board connected to the backplane. The PCIe connection board and the CPCIe connection board are connected by an adapted optical fiber cable.
[0031] In some embodiments, Figure 1 As shown, the CPU may include: a Root Complex module (Root Complex in the figure); the PCIe connection board may include: a first Redriver chip (PCIeRedriver in the PCIe connection board in the figure), a first optical transceiver module (optical transceiver module in the PCIe connection board in the figure) and a first optical fiber interface (optical fiber interface in the PCIe connection board in the figure); wherein the Root Complex module is connected to the first Redriver chip, the first optical transceiver module and the first optical fiber interface in sequence through gold fingers.
[0032] Specifically, the signal transmitted between the first Redriver chip and the first optical transceiver module is an electrical signal; the signal transmitted between the first optical transceiver module and the first optical fiber interface is an optical signal.
[0033] It should be noted that the Root Complex module can connect the CPU, the memory subsystem and the PCIe subsystem. For the relevant description of the Root Complex module, please refer to the prior art, and this application will not repeat it again.
[0034] It should also be noted that the PCIe connection board that communicates with the CPU through PCIe can receive voltage and data signals from the mainboard of the real-time simulation machine through the gold finger, and convert the electrical signals of the PCIe bus into optical signals through the first Redriver chip and the first optoelectronic transceiver module.
[0035] In some embodiments, Figure 1 As shown, the CPCIe connection board may include: a second optical fiber interface (optical fiber interface in the CPCIe connection board in the figure), a second optical transceiver module (optical transceiver module in the CPCIe connection board in the figure) and a second Redriver chip (PCIe Redriver in the CPCIe connection board in the figure); wherein the second optical transceiver module is respectively connected to the second optical fiber interface and the second Redriver chip.
[0036] Specifically, the signal transmitted between the second optical fiber interface and the second optical transceiver module is an optical signal; the signal transmitted between the second optical transceiver module and the second Redriver chip is an electrical signal.
[0037] In some embodiments, Figure 1 As shown, the backplane may include: a PCIe Switch chip (PCIe Switch in the backplane in the figure) and at least one CPCIe downstream port (CPCIe Down StreamPort in the backplane in the figure), each CPCIe downstream port is connected to a corresponding IO module; the PCIe Switch chip is connected to the second Redriver chip in the CPCIe connection board.
[0038] In actual applications, the CPCIe connection board and the backplane can be connected through a high-speed backplane connector; of course, it is not limited to this, and can also be determined according to the application environment and user needs. This application does not limit it and it is within the protection scope of this application.
[0039] It should be noted that both the PCIe connection board and the CPCIe connection board are equipped with fiber optic interfaces, namely the first fiber optic interface and the second fiber optic interface mentioned above, and use fiber optic cables as channels to realize long-distance transmission of optical signals between the connection boards. In practice, the length of the fiber optic cable can reach 150m, which significantly improves the transmission distance of the signal.
[0040] After the optical signal is transmitted to the CPCIe connection board, the optical signal is converted back into an electrical signal through the second optical transceiver module in the CPCIe connection board and enters the PCIe Switch chip on the backplane; the PCIe Switch chip can expand the PCIe communication bus signal into multiple PCIe ports, and several CPCIe downstream ports can realize connection with the PCIe ports of different functional IO modules.
[0041] It should also be noted that the IO module can use FPGA (Field Programmable Gate Array) as a control unit, and complete the changes in physical quantities and communication data after receiving the control command sent by the real-time simulator through PCIe communication, thereby realizing the functional test of the ECU. The main functions of the first redriver chip and the second redriver chip are to regenerate signals, compensate for losses, and increase signal quality on high-speed interfaces.
[0042] In some embodiments, the simulation system may be a distributed real-time simulation system; of course, it is not limited thereto, and may also be determined based on the application environment and user needs, all within the protection scope of this application.
[0043] Specifically, the simulation system can utilize the characteristics of optical signal transmission to realize the application of long-distance transmission. In the scenario of hardware-in-the-loop testing of automotive electronic controllers, it is more conducive to the flexible configuration of the spatial position of IO modules, forming a highly integrated and practical distributed real-time simulation system based on PCIe protocol and optical fiber transmission media.
[0044] In practical applications, the PCIe protocol can be a high-speed serial protocol of PCIe3.0 and below; the present application can be based on a high-speed serial protocol and use optical fiber as a signal transmission medium, and can be expanded to a distributed real-time simulation system of several PCIe devices.
[0045] It should be noted that an optoelectronic conversion module is applied to the PCIe connection board that communicates with the CPU in the simulation system, so that the real-time simulation machine and the expansion chassis can be connected through an optical fiber cable of more than 100 meters. Signal isolation improves communication reliability, and the long-distance optical fiber transmission of PCIe is more flexible in configuration and has a wider range of applications in the hardware-in-the-loop testing of automotive electronic controllers.
[0046] Based on the above principles, the simulation system provided by the present application includes: a real-time simulation machine and an expansion chassis; the real-time simulation machine includes: a CPU and a PCIe connection board; the expansion chassis includes: a CPCIe connection board, a backplane and at least one IO module; the PCIe connection board is optically connected to the CPCIe connection board; each IO module is connected to the corresponding automotive electronic controller. The present application uses optical fiber cables as channels to realize long-distance transmission of optical signals between connection boards, which significantly improves the transmission distance of signals, so as to overcome the existing problem that the PCIe signal is severely attenuated when the transmission distance increases when copper cables are used as signal transmission media, and the limited transmission distance limits the environment construction of hardware-in-the-loop simulation testing.
[0047] In addition, the simulation system provided in this application can convert optical signals back into PCIe electrical signals by applying a CPCIe connection board on the backplane, and then expand the backplane into multiple PCIe downstream ports through a PCIe Switch chip for connecting multiple IO modules with different functions, forming a highly integrated automotive electronic controller test solution.
[0048] It is worth noting that in the existing solution, there is no isolation between the PCIe communication circuit and the IO module of the downstream port of the link, which makes the PCIe signal susceptible to influence and reduces the communication quality. However, in the solution provided by the present application, the PCIe connection board and the CPCIe connection board are respectively provided with optical transceiver modules, and the electrical signal of the PCIe communication and the interference source of the PCIe downstream port are isolated through optical signals, which can avoid the PCIe signal from being susceptible to influence, ensure the communication quality and improve its stability.
[0049] It should be noted that the relevant description of the automotive electronic controller can be found in the prior art, and this application will not go into details.
[0050] The features recorded in the various embodiments in this specification can be replaced or combined with each other, and the same and similar parts between the various embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.
[0051] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.
[0052] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
[0053] It should also 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 presence of other identical elements in the process, method, article or device including the elements.
Claims
1. A simulation system, characterized in that: include: Real-time simulator and expansion chassis; The real-time simulation machine includes: a CPU and a PCIe connection board; the expansion chassis includes: a CPCIe connection board, a backplane and at least one IO module; The PCIe connection board is connected to the CPCIe connection board by optical fiber; each of the IO modules is connected to a corresponding automotive electronic controller.
2. The simulation system according to claim 1, characterized in that: The PCIe connection board and the CPU are connected to each other via gold fingers.
3. The simulation system according to claim 1, characterized in that: The CPU includes: a Root Complex module; the PCIe connection board includes: a first Redriver chip, a first optical transceiver module and a first optical fiber interface; The Root Complex module is connected to the first Redriver chip, the first optical transceiver module and the first optical fiber interface in sequence through gold fingers.
4. The simulation system according to claim 3, characterized in that: The signal transmitted between the first Redriver chip and the first optical transceiver module is an electrical signal; The signal transmitted between the first optical transceiver module and the first optical fiber interface is an optical signal.
5. The simulation system according to claim 1, characterized in that: The CPCIe connection board includes: a second optical fiber interface, a second optical transceiver module and a second Redriver chip; The second optical transceiver module is connected to the second optical fiber interface and the second Redriver chip respectively.
6. The simulation system according to claim 5, characterized in that: The signal transmitted between the second optical fiber interface and the second optical transceiver module is an optical signal; The signal transmitted between the second optical transceiver module and the second Redriver chip is an electrical signal.
7. The simulation system according to claim 1, characterized in that: The backplane includes: a PCIe Switch chip and at least one CPCIe downstream port, each CPCIe downstream port is connected to the corresponding IO module; The PCIe Switch chip is connected to the second Redriver chip in the CPCIe connection board.
8. The simulation system according to any one of claims 1 to 7, characterized in that: The CPCIe connection board and the backplane are connected via a high-speed backplane connector.
9. The simulation system according to any one of claims 1 to 7, characterized in that: The upper limit of the length of the optical fiber cable between the PCIe connection board and the CPCIe connection board is 150m.
10. The simulation system according to any one of claims 1 to 7, characterized in that: The simulation system is a distributed real-time simulation system.