Method and system for pre-diagnosing vehicle diesel engine accelerator faults

Abstract

The invention discloses a vehicle diesel engine accelerator fault prediagnosis method and system. According to the original voltage signal of the accelerator, the accelerator signal before and after filtering and the signal change rate are obtained and the state of the accelerator is judged. Whether the brake is judged by the upper and lower edges of the main and auxiliary brake signals is output. Brake verification signal; confirm whether the speed, vehicle speed, and brake verification signal meet the conditions, and output the brake signal verification result and brake reset signal; select the accelerator opening signal correction method according to the brake signal verification result and obtain the corrected accelerator signal; According to the driving mode and braking state, the current throttle opening signal is judged and the final throttle signal is output; the throttle fault type is judged by the difference between the final throttle signal and the filtered throttle signal. The invention can realize good coordination and cooperation between the braking signal and the accelerator signal, accurately judge the accelerator failure, and ensure the stable operation of the diesel engine.

Description

technical field [0001] The invention belongs to the technical field of vehicle diesel engine throttle fault prediagnosis, in particular, the invention relates to a vehicle diesel engine throttle fault prediagnosis method and system. Background technique [0002] With the development of the electronic control system of diesel engine, the problem of controlling the throttle opening of diesel engine has been paid more and more attention. Considering the various complex operations that need to be carried out during the running of the vehicle diesel engine, the control of the throttle opening further affects the stability of the driving process. During the continuous process of opening and closing the throttle, if the accurate coordination and cooperation with the current brake signal cannot be completed, the fault type of the throttle cannot be accurately judged, which will not only affect the stability of the diesel engine, but also lead to abnormal fuel injection and fuel cons...

AI Technical Summary

Problems solved by technology

During the continuous process of opening and closing the throttle, if the accurate coordination and cooperation with the current brake signal cannot be completed, the fault type of the throttle cannot be accurately judged, which will not only affect the stability of the diesel engine, but also lead to abnormal fuel injection and fuel consumption. If it rises, it will even pose a threat to the personal safety of the driver and lead to more serious consequences.

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