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Smart diagnostic method for active responsiveness of VGT executor

A diagnostic method and actuator technology, applied in the direction of instruments, electrical testing/monitoring, control/regulation systems, etc., can solve problems such as reliability and accuracy cannot be guaranteed, and misjudgment is easy to occur

Active Publication Date: 2018-02-09
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires a large amount of data calibration work, and the reliability and accuracy cannot be guaranteed
prone to misjudgment

Method used

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  • Smart diagnostic method for active responsiveness of VGT executor
  • Smart diagnostic method for active responsiveness of VGT executor
  • Smart diagnostic method for active responsiveness of VGT executor

Examples

Experimental program
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Embodiment 1

[0023] This embodiment provides an active responsive diagnosis method for an intelligent VGT actuator, which includes:

[0024] S10 , judging whether the EGR valve meets the admittance working condition according to the comparison result of the change of the set system flow rate and the set threshold value.

[0025] When the active responsive diagnosis method of the intelligent VGT actuator in this embodiment works, it first needs to judge the access condition of the diagnosis function. Eliminate possible special working conditions or frequency interference caused by actuator actions to the system. Make the diagnostic system in a relatively stable working state. The main sources of disturbance in the system are the EGR valve and the engine.

[0026] In this embodiment, under the control mode where the engine handles low idle speed, the supercharging pressure, engine speed, vehicle speed, accelerator, and clutch need to meet the threshold value requirements, and the torque sh...

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Abstract

The invention discloses a smart diagnostic method for active responsiveness of a VGT (Variable Geometry Turbocharger) executor. According to the invention, through diagnosis on an EGR (Exhaust Gas Recirculation) valve, working condition of an engine, an external environment and states of related executors are performed at first, other interference in a closed-loop space of the diagnosis function is eliminated and influence on judgment of the diagnosis is removed. An ECU sends excitation signals to the VGT executor. The VGT executor sends a feedback of related control values normally after receiving the signals. The ECU calculates the amplitude of received signals according to Fourier transform after receiving the related feedback signals. Comparison between the value obtained through calculation and an inherent threshold value is performed for fault confirmation and output.

Description

technical field [0001] The invention belongs to the field of electronic control of automobile engines, and is a diagnosis method based on Fourier transform, which diagnoses the responsiveness of the actuator by actively exciting the actuator and judging the resonance effect. Background technique [0002] As environmental awareness continues to increase worldwide, vehicle emissions regulations are becoming increasingly stringent. At present, China has begun to implement the National IV emission regulations on a large scale, and the National V emission regulations have been implemented in developed regions such as Beijing and Shanghai. The National VI emission regulations will be implemented around 2020 in the future. The regulations will put forward clear requirements on the response performance of actuators that affect emissions, and it is necessary to make judgments on faults such as actuator sticking and carbon deposition. [0003] In the structure of a new generation of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02
CPCG05B23/0221
Inventor 陈铁任灵童吕颖
Owner CHINA FIRST AUTOMOBILE