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Airborne Computer Study of Fault Diagnosis Platform

Non-real time, so by the IPC system consisting of a single platform known as non-real-time signal simulation platform. Figure 2. The platform of the output signal characteristics: flight software by keyboard or interactive interface directly set, model simulation calculating the output signal after the status change signal output when no simulation. The platform for non-real-time test, test speed on the requirements of the test platform is low, suitable for flight control system, air data system, the flight parameter recording system, head-up display system for testing. Relative to non-real-time signal simulation platform,[link widoczny dla zalogowanych], consisting of more than one IPC system consisting of simulation platform, called real-time signal simulation platform. Figure 3. Platform consists of a single type of industrial machine as the server, and other industrial computer systems as workstations, composed of local area network. IPC can be collected through software, aircraft man-machine interface or control system (stick, pedals, throttle lever, etc., from the ground simulators Simulation) of the signal, determined by calculating flight model, and then transmitted through the network flight to the industrial computer systems. The number of industrial computer systems on-board computer with the same number of functions one correspondence. This realization of the full-board real-time simulation output signal with a high degree of simulation. Therefore we can say is the real-time signal simulation platform, a single-board computer system signal simulator. Platform suitable for all kind of airborne computer systems provide a standard signal. 3.2 The basic principle of the test platform, the working principle of the test platform shown in Figure 4. The host for the industrial machine, slots on-board air bus signals the docking test card, the frequency signal test card, test card discrete signal, analog signal test card, test card with the digital signal and the on-board EPROM read the card. Under the control of the host, Measurement and Testing Technology 2002 ・ No. 4 Figure 3 bed semi-real-time signal simulation block diagram of the test card was tested on the onboard computer in the standard response of the signal under test and diagnose the problem lies. Figure 4 sets the basic principles of testing semi-3.3 interface, the basic type of interface platform platform basically divided into two types, one is the whole platform, one is a plug-in platform. Machine platform simulation platform, the test platform and tested on-board computer interface, on the whole test. Simulation platform plug-in platform, the test platform and a computer plug-in interface to be tested on the plug-in for testing. As the bolt machine model being tested and the number of different forms of more plug-in interface is vastly different, so test computer interface platform for being different and have different models, are not interchangeable between models. 3.4 Basic principles of diagnostic testing on-board computers as a whole, the general function test, and sometimes can be random testing method. Primarily to test the machine's static and dynamic performance. Do not have to master the on-board computers for their basic circuit and circuit parameters, widely used test equipment imports and confidential. Testing of plug-ins, the general structure of the test method, random testing method or slightly diagnosis. Test method requires the use of the well-known circuit principle and core part of the circuit parameters, in particular, to grasp the plug-in interface electrical characteristics. In addition to the onboard computer's CPU plug-in, other plug-in data, address and control bus (C bus) through plug-in platform and IPC's EISA or PCI bus interface. The basic test method: The A / D, DI and other input plug-in provides a standard signal simulation platform, the IPC controls the plug-in for the collection; on the D / A,[link widoczny dla zalogowanych], DO and other output plugin from the control of the IPC plug-in output signal, then the corresponding test cards for testing. Airborne Computer CPU plug-in testing because of its CPU and special. In the plug-in platform: To prevent the plug-in CPU and IPC CPU contention with three bus,[link widoczny dla zalogowanych], plug-ins or third bus and EISA bus, PCI bus is not connected in three; in the test methods: micro diagnostics, a \test: Remove the-board EPROM chips, EPROM chips put on test,[link widoczny dla zalogowanych], the test program CPU (the main function of the instruction and registers), interrupt, DMA and other modules one by one test, the required standard signal provided by the simulation platform, the output test signal from the test platform. Airborne RPROM chip on the code, read the card through the machine set E1ROM read out bit by bit code with the standard comparison, there are different contractors for the failure is. 4. Conclusion fault diagnosis platform using open architecture, the new signal types can be added corresponding simulation cards and test card, the onboard computer on the new interface platform can also be added. Since the establishment of open architecture,[link widoczny dla zalogowanych], onboard computers and troubleshooting software platform, as long as the corresponding changes, you can achieve security classification of import and test computer systems with high economic and military value. ■ Solid

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