Fault injection device

Abstract

The invention relates to a fault injection device. The fault injection device comprises an operation panel used for setting a type of a fault signal needing injection, a signal collection module used for filtering and shaping a signal from a vehicle sensor to generate an original signal and inputting the original signal to an MCU, an MCU for processing the signal outputted from the signal collection module to generate a fault injection signal meeting the type of the fault signal needing injection as an output signal according to the type of the fault signal needing injection received by the operation panel in a situation that there is a fault injection mode or employing the original signal from the signal collection module as an output signal directly in a situation that there is not a fault injection mode, and a signal output module for receiving the output signal from the MCU and outputting a square wave signal or a simulation signal to an electric control module to be detected. By utilization of the fault injection device, fault injection with various types can be achieved.

Description

technical field [0001] The invention relates to the field of fault testing of vehicle electronic systems, in particular to a fault injection device for simulating fault injection of vehicle electronic systems. Background technique [0002] At present, the functions of electronic control modules equipped on vehicles are becoming more and more complex. The working status of some modules (electrically controlled power steering system EPS) directly affects driving safety, and wheel speed sensors and torque sensors are often important inputs for these modules, so , it is necessary to test the fault tolerance and coping strategy of this type of module when the sensor fails. [0003] The fault injection form of existing fault injection devices mostly adopts array relays, and injects fault signals through hard-wired changes. The disadvantage of this is that it cannot guarantee that each pulse cycle of the injected square wave signal or analog signal is complete, and the measured v...

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Problems solved by technology

[0003] The fault injection form of existing fault injection devices mostly adopts array relays, and injects fault signals through hard-wired changes. The disadvantage of this is that it cannot guarantee that each pulse cycle of the injected square wave signal or analog signal is complete, and the measured voltage Therefore, the control module may report errors; and the fault injection device is only for several common fault modes, such as short circuit and open circuit, etc., and has not studied the faults such as signal frequency, amplitude and duty cycle; in addition, the existing The fault signal of the scheme is used as an external input and is independent of the fault diagnosis module. Therefore, it will be very troublesome to define and edit the fault signal

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