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Plug-and-play system based on controller area network (CAN) bus and design method thereof

A CAN bus, plug-and-play technology, applied in the space field, can solve the problems of reducing product reliability, increasing development costs and development cycles, lack of compatibility and reusability of equipment, and achieve the effect of reducing development costs

Active Publication Date: 2012-09-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the buses (1553B, CAN, RS485) used in aircraft design are all for a single flight mission to achieve control management and data transmission functions. The details of the relevant protocols are independently formulated and independently developed depending on the specific mission. Since there are no relevant standards, The equipment lacks the characteristics of compatibility and reusability, and all equipment in the aircraft system must also modify the design of the interface according to this task (such as figure 1 ), especially if the task buses are different, not only the interface protocol of these devices must be modified, but also the hardware interface must be redesigned, which will undoubtedly increase the development cost and development cycle, and reduce the reliability of the product due to the modification of the hardware interface and protocol

Method used

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  • Plug-and-play system based on controller area network (CAN) bus and design method thereof
  • Plug-and-play system based on controller area network (CAN) bus and design method thereof
  • Plug-and-play system based on controller area network (CAN) bus and design method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Combining Figure 2-Figure 9 , a kind of plug-and-play system based on CAN bus of the present invention, it is made up of host computer, plug-and-play conversion module and aircraft equipment, is characterized in that: adopt CAN between host computer and plug-and-play conversion module The RS422 electrical standard is adopted between the bus, the plug-and-play conversion module and the aircraft equipment.

[0024] A kind of design method of the plug and play system based on CAN bus of the present invention, the steps are as follows:

[0025] Step 1: Design of the main computer

[0026] The host computer mainly receives the device information of the plug-and-play conversion module from the CAN bus, judges which devices are new and which devices have been uninstalled according to the received device information, saves the device information of the new device, and adds the new device information to the device information table and allocate the necessary device...

Embodiment 2

[0031] Embodiment 2: the working process of the plug and play system is as follows:

[0032] Power-on process of aircraft system equipment:

[0033] 1. The plug-and-play module periodically sends initialization request frame information to the aircraft system equipment, and receives the initialization response frame sent by the aircraft system equipment;

[0034] 2. Immediately judge that there is an aircraft system device connected to the system, and the plug-and-play module generates a high-level pulse in the status line

[0035] 3. The main computer detects that there is an aircraft system device connected to the system, and detects whether the data line is idle;

[0036] 4. If the data line is not idle, continue to wait until the data line is free

[0037] 5. If the data line is free, immediately send an initialization message frame to the plug-and-play module;

[0038] 6. After receiving the initialization request frame, the plug-and-play module sends an initialization...

Embodiment 3

[0050] Example 3: Binding figure 2 , Figure 7 , Figure 8 , in order to further verify the feasibility of designing a plug-and-play interface, a plug-and-play system is designed according to the plug-and-play scheme. Schematic diagram of the plug-and-play system, the whole system includes the main computer, the plug-and-play conversion module, two equipment stand-alone (including flywheel and star sensor), among which the RS422 electrical standard is adopted between the plug-and-play conversion module and the equipment stand-alone , between the plug-and-play conversion module and the host computer, there are data lines and status lines. The data lines adopt the CAN electrical standard, and the status line is the general I / O. For the host computer, the status line is the input. In the case of a transition block, the status line is the output.

[0051] ①The flywheel is connected to the plug-and-play system

[0052] Incorporate the flywheel into the system (i.e. figure 2 ...

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Abstract

The invention provides a plug-and-play system based on a controller area network (CAN) bus and a design method thereof. The plug-and-play system based on the CAN bus is mainly composed of a main computer, a plug-and-play conversion module and an aircraft device. The CAN bus is adopted between the main computer and the plug-and-play conversion module, and a recommended standard (RS) 422 electric standard is adopted between the plug-and-play conversion module and the aircraft device. A period of the main computer is set as 50 milliseconds, namely the plug-and-play conversion module mainly comprises RS 422 conversion, a central processing unit (CPU) processor, a direct current (DC) / DC power supply conversion module, an field programmable gate array (FPGA) processor and a CAN controller. Data transmission rate of the aircraft device is 115.2 kbps, each aircraft device sends 24-byte information, and a period of the plug-and-play module is set as 5 milliseconds. Installing of any peripheral on the plug-and-play system is simple and safe operation, in the plug-and-play system, an installing process of devices is automatic, and reset of the system or reconfiguration of device parameters in an aircraft system is not required.

Description

(1) Technical field [0001] The invention relates to space technology, specifically a CAN bus-based plug and play system and a design method thereof. (2) Background technology [0002] There are two types of data buses: serial and parallel. Parallel bus has fast transmission speed, but synchronization is difficult, and the interface is relatively complex. It is generally used for simple data transmission within the device, not as a system bus; serial bus generally has a simpler interface and is suitable for data transfer between subsystems with long distances. Exchange, so it is widely used in aircraft. At present, the commonly used buses in the field of aircraft include MIL-STD-1553B, SpaceWire, RS-485, CAN, etc. MIL-STD-1553B was proposed by the US military in 1978 as a standard bus for networking electronic subsystems of the US Air Force. The 1553B bus is a centralized serial bus, which consists of a bus controller responsible for bus scheduling and management; several ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/40
Inventor 李葆华王常虹陈希军奚伯齐
Owner HARBIN INST OF TECH
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