EGR Valve Deterioration Calculation Using Differential Pressure
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Solution Overview
Problem
Accurately calculating the deterioration degree of an EGR valve is challenging due to pressure change amounts being influenced by factors other than valve deterioration, making it difficult to distinguish deterioration from other changes.
Innovation Solution
An EGR valve deterioration degree calculation system that includes a pressure acquisition process, pressure change amount calculation, differential pressure calculation, and deterioration degree calculation, using both pressure change amount and differential pressure, as well as engine speed, to accurately assess valve deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the deterioration degree of EGR valve is calculated based only on pressure change amount, then the calculation process is simple, but the accuracy of deterioration degree calculation deteriorates due to influence from other factors
Solution Approach 1:
The patent changes the parameters used for deterioration calculation from only pressure change amount to a combination of pressure change amount and differential pressure. This parameter expansion allows the system to account for multiple influencing factors simultaneously, improving calculation accuracy while maintaining reasonable complexity through systematic integration of these parameters
2Ease of operation
If pressure change amount is used as the sole basis for deterioration calculation, then the measurement process is simple, but the reliability of deterioration assessment deteriorates due to confounding factors
Solution Approach 1:
The patent introduces differential pressure as an intermediary parameter that mediates between the EGR valve state and the pressure change amount. This intermediary helps isolate the effect of valve deterioration from other confounding factors such as intake air flow variations, enabling more reliable deterioration assessment while maintaining operational simplicity through automated calculation
3Quantity of substance
If only pressure change amount is considered, then the data processing requirement is low, but the precision of distinguishing deterioration from other changes deteriorates
Solution Approach 1:
The patent segments the pressure measurement data into two distinct components: pressure change amount (overall pressure variation) and differential pressure (pressure difference across the EGR valve). This segmentation allows the system to process and analyze each parameter separately, improving the precision of deterioration distinction while keeping data processing volume manageable through focused analysis of segmented parameters
Data Source
AI summary
An EGR valve deterioration degree calculation system configured to calculate a degree of deterioration of an EGR valve includes an execution device. The execution device is configured to perform: a pressure acquisition process; a pressure change amount calculation process of calculating a pressure change amount associated with an operation of opening and closing the EGR valve; a differential pressure calculation process of calculating a differential pressure between an upstream side of the EGR valve and a downstream side of the EGR valve when the EGR valve is in a closed state; and a deterioration degree calculation process of calculating the degree of deterioration of the EGR valve based on the pressure change amount and the differential pressure.