Fault-tolerant control method and control system for atmospheric pressure sensor for diesel engine

Abstract

The invention provides a fault-tolerant control method and control system for an atmospheric pressure sensor for a diesel engine. The control method comprises the following steps of obtaining a faultstate of the atmospheric pressure sensor for the diesel engine according to a signal such as a voltage of the atmospheric pressure sensor for the diesel engine; and when the sensor is judged to be inthe fault state, operating an atmospheric pressure analysis redundancy algorithm model, and replacing a collected value of the sensor with a predicted value, to provide an accurate atmospheric pressure value for an ECU control system. Meanwhile, a corresponding measure is taken according to a working condition of the diesel engine when the atmospheric pressure sensor breaks down, that is, the control method can have relatively high fault-tolerant capacity when the atmospheric pressure sensor breaks down; a reasonable measure is taken in time; and therefore, the environmental adaptability of the diesel engine in a plateau and a plain is improved.

Description

technical field [0001] The invention belongs to the technical field of diesel engine fault diagnosis, and in particular relates to a fault-tolerant control method and control system of an atmospheric pressure sensor of a diesel engine. Background technique [0002] The requirements of high power density and plateau operation of diesel engines require that the diesel engine electronic control unit (ECU) can implement different oil-gas cooperative control strategies according to different altitudes, and improve the adaptive combustion capability of diesel engines at different altitudes, so as to meet the requirements of diesel engine plateau power recovery. [0003] When the traditional ECU fault diagnosis module diagnoses the fault of the atmospheric pressure sensor, it generally uses a fixed value to replace the sampling value of the atmospheric pressure sensor. When the diesel engine is in the plateau state, the intake air volume is reduced, which leads to the deterioration...

AI Technical Summary

Problems solved by technology

[0003] When the traditional ECU fault diagnosis module diagnoses the fault of the atmospheric pressure sensor, it generally uses a fixed value to replace the sampling value of the atmospheric pressure sensor. When the diesel engine is in the plateau state, the intake air volume is reduced, resulting in deterioration of combustion and power drop

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