On-line detection method for simulating oil temperature of engine and crosslinking of avionics system

The invention relates to an on-line detection method for simulating oil temperature of an engine and crosslinking of an avionics system, which comprises the following steps of: (1) compiling of an on-line detection software: converting a temperature signal into a resistance signal through a resistance signal output board card by using the on-line detection software, calibrating the resistance value of a test cable, and simultaneously considering the calibrated resistance value in the actual output resistance signal of the software; (2) carrying out testing: after the debugging of the detectiondevice is finished, connecting the detection device with a tested system of an airplane through the test cable, setting test parameters on a test interface of the detection device, sending a test instruction, wherein the detection device automatically outputs a detection temperature value and finally displays the detection temperature value in an engine display and indication system of the airplane, and meanwhile, data m