Purge System Abnormality Detection Using Two-Stage Diagnosis
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Solution Overview
Problem
Existing abnormality determination methods for purge systems increase power consumption during diagnostic processes, which is inefficient.
Innovation Solution
The method involves estimating diagnosis parameters by closing the outside air shutoff valve in two stages, with different threshold values to determine the presence of abnormalities in the vapor and purge passages, allowing for reduced power consumption when no abnormalities are detected and increased accuracy when abnormalities are confirmed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the output of the purge pump is increased to improve abnormality detection accuracy, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The abnormality determination process is divided into two distinct stages: a first determination using a first threshold value, and a second determination using a second threshold value. This segmentation allows the system to perform a preliminary check with lower energy consumption, and only escalate to high-power mode when necessary.
Solution Approach 2:
The patent applies partial action by using a first, lower threshold value for initial abnormality screening. Only when this preliminary determination indicates a possible abnormality does the system proceed to the second determination with the higher threshold value and increased pump output, thus avoiding excessive power consumption during normal operation.
2Use of energy by moving object
If a two-stage determination process is implemented to reduce power consumption, then use of energy is reduced, but device complexity increases
Solution Approach 1:
The determination process is segmented into two stages with different threshold values. The first stage uses a first threshold for preliminary screening, and the second stage uses a second threshold for confirmation. This segmentation reduces overall energy consumption while maintaining manageable complexity through a structured, stepwise approach.
Solution Approach 2:
The system performs partial determination in the first stage using only the first threshold value and normal pump output. This partial action allows the system to avoid the full complexity and power consumption of a complete determination process during normal operation, reducing energy use while keeping the system design relatively simple.
Data Source
AI summary
An method for determining an abnormality in a passage of a purge system includes: closing an outside air shutoff valve in a state where an output of a purge pump is set to be a high output upon determining that there is a possibility of an abnormality in the passage based on a first diagnosis parameter estimated by closing the outside air shutoff valve in a state where the purge pump is driven; at that time, estimating a second diagnosis parameter that is allowed to be classified into a third region in which it is determined that there is no abnormality in the passage and a fourth region in which it is determined that there is an abnormality in the passage, with a second threshold value as a boundary; and determining that there is an abnormality in the passage when the second diagnosis parameter is included in the fourth region.