Simple whole machine diagnostic unit of electric control diesel engine

Abstract

The invention discloses a simple diagnostic unit for assisting the fast fault detection of an electric control system of a diesel locomotive. The diagnostic unit is provided with nine interfaces which are respectively connected with an ECU (Electric Control Unit) of a whole vehicle to be detected. A simulation whole vehicle fault diagnosis communication interface, a whole vehicle execution load simulator, a whole vehicle load meter indication simulator, a signal detection interface, an accelerator change-over switch and the like are respectively connected with an electric control circuit interface in the ECU. The fault diagnosis communication interface can output dynamic curve of engine working parameters and fast judge the fault information and fault parts. The diagnostic unit provides associated load to simulate the running environment of the whole vehicle to be detected, and a fault point transmits a state parameter to the ECU so that the ECU activates a corresponding fault code to flicker. By observing an error flicker code transmitted by a fault display, the fault part of the present running engine can be known; meanwhile, the fault code can be stored in a memory. The invention breaks away from the complicated whole vehicle wire harness and electric appliances, rapidly distinguishes that fault occurs to the whole vehicle electric control system or the engine electric control system.

Description

technical field [0001] The invention belongs to the fault diagnosis technology of diesel locomotives, and in particular relates to a simple diagnosis device for quickly troubleshooting the faults of the electric control system of diesel locomotives. Background technique [0002] At present, China has fully implemented the National III emission regulations, and all vehicle engines have been fully upgraded to electronically controlled engines, mainly by adding some electronic sensors, actuators and other control components on the basis of the main mechanical structure of the original engine. These components are matched to the whole vehicle and the mechanical system of the vehicle, so once the electronically controlled engine behaves abnormally or breaks down, it is impossible to judge the failure of the electronically controlled engine according to the traditional mechanical engine processing method, and special testing equipment must be used, such as special Fault diagnosis ...

AI Technical Summary

Problems solved by technology

These components are matched to the whole vehicle and the mechanical system of the vehicle, so once the electronically controlled engine behaves abnormally or breaks down, it is impossible to judge the failure of the electronically controlled engine according to the traditional mechanical engine processing method, and special testing equipment must be used, such as special Fault diagnosis instruments, oscilloscopes, digital multimeters, etc. are used to search for faults, not to mention time-consuming and laborious. The key is that although the fault diagnosis instrument can locate which system part has a problem, it cannot specifically determine whether it is caused by a problem in the vehicle system or the engine system. , so in many cases it is necessary to carefully check and judge one by one

Especially in the process of vehicle production, the personnel of the engine manufacturer are not familiar with the circuit system of the vehicle, and the personnel of the vehicle assembly are not familiar with the electronic control system of the engine. Therefore, when a problem occurs that may involve two systems, Troubleshooting is more difficult

Images