Diesel Exhaust Fluid Pressure Line Obstruction Detection
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Solution Overview
Problem
Existing Diesel Exhaust Fluid (DEF) delivery systems fail to promptly detect obstructions in pressure lines, leading to delayed identification of malfunctions, as they rely on consumption detection or excessive nitrogen oxide levels, which can result in prolonged system failure and reduced emission reduction effectiveness.
Innovation Solution
The system employs a pressure sensor to receive and filter pressure signals, determining a dosing pressure signal and integrated value to detect obstructions by comparing it with a predetermined threshold, allowing for real-time obstruction detection and potential corrective actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DEF delivery systems use consumption detection or excessive nitrogen oxide levels to detect malfunctions, then the system can identify failures, but the detection time is delayed and system failure is prolonged
Solution Approach 1:
The system performs preliminary action by detecting obstructions in the pressure line before DEF is actually consumed or before excessive nitrogen oxides are emitted. The pressure sensor monitors the pressure line continuously, identifying obstructions at their earliest stage, allowing the system to alert the driver before the malfunction affects emission reduction performance.
2Loss of time
If the system monitors pressure signals continuously, then obstruction detection is immediate, but the system complexity and cost increase
Solution Approach 1:
The system uses pressure as an intermediary parameter to detect obstructions indirectly. Rather than directly detecting obstruction or measuring DEF consumption, the pressure sensor monitors pressure changes in the pressure line, which serve as an early indicator of potential obstructions. This intermediary measurement enables early detection without requiring direct contact with the obstruction or complex monitoring systems.
Data Source
AI summary
A method and system for detecting whether a pressure line in a diesel exhaust fluid (DEF) delivery system has an obstruction. The system includes an electronic control unit with an electronic processor that is configured to receive an unfiltered pressure signal from a pressure sensor; to electronically filter the unfiltered pressure signal to determine a dosing pressure signal; to determine an integrated value based on the dosing pressure signal; and to determine whether the pressure line is obstructed by comparing the integrated value with a predetermined threshold.