A multi-fault injection device for detecting aeroengine ecu signal interface

Abstract

The invention provides a multi-malfunction injection device for detecting an aero-engine engine control unit (ECU) signal interface. The multi-malfunction injection device comprises a malfunction equipped computer, a communication module, fifteen relay arrays, two fixed value resistances, a variable resistance, a relay control signal drive module and the like. The relay arrays are installed according to a novel topological structure. The fixed value resistances are used for self-detecting. The variable resistance is used for malfunction injection. The multi-malfunction injection device has a function of the self-detecting. According to the novel topological structure of the relay arrays, five common types of the malfunction injections, such as short circuit between signal lines, open circuit of the signal lines, resistances overlapped between the signal lines, resistances connected on the signal lines in series, and short circuit between the signal lines and the ground wire, which can happen on an n (2<=n<=5) wiring system input and output signal interface used in the aero-engine ECU, are achieved. Therefore, the multi-malfunction injection device additionally has the function of the self-detecting.

Description

technical field [0001] The invention relates to a device for detecting the fault of an aircraft engine ECU signal interface, in particular to a multi-fault injection device for the ECU signal interface of the aircraft engine HILS system. Background technique [0002] The aero-engine full authority digital electronic control (FADEC) system is one of the key components with the most complex functions and the highest concentration of equipment on the aircraft, and its reliability is directly related to the flight safety of the whole aircraft. The electronic control unit (ECU) is the core of FADEC, and its essence is a highly reliable digital fault-tolerant control computer, including a large number of input and output signal interfaces and high-performance computing components. Among them, the sensor and actuator signal cable interface of ECU is prone to five kinds of faults, such as short circuit between signal lines, open circuit of signal lines, resistance between signal lin...

AI Technical Summary

Problems solved by technology

[0003] The Chinese patent with publication number CN102508452A discloses a fault injection panel capable of simulating multiple faults. The patent states that it can simulate the above 5 faults, but its relay array is too complicated and can only fault 2 signal lines at the same time. Injection cannot meet the fault injection requirements of aero-engine ECU's various wire-based signals; the Chinese patent with the publication number CN102566567A discloses an ECU sensor signal fault injection device for the HILS system of an automobile engine. The patent states that it can simulate the above 4 The use of electronic switches to realize fault simulation has the advantage of simple structure, but signal distortion is prone to occur when electronic switches pass through large currents, and high-voltage signals such as engine speed will inevitably cause electronic switches to fail; the Chinese patent application with the publication number CN102608990A An ECU actuator control signal fault input device for engine HILS system is proposed. This patent uses a relay array to simulate three types of faults, but it cannot realize the fault simulation of the resistance of the signal line string and the resistance between the signal lines; the publication number is The Chinese patent of CN102520629A discloses a fault injection method capable of simultaneously injecting faults into two signal lines. The patent states that four G6AU series relays of Omron Corporation can be used to implement fault injection on two signal lines at the same time, but its The number of simulated faults is small, and the fault injection of signal lines above 2-wire system cannot be realized

However, it is also a very critical point. As a fault injection device, it must have a self-test function to ensure that it works normally, so as to ensure that the fault injection of the ECU signal interface is accurate, but the above four inventions do not have a self-test function.

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