DPF Pressure Pulsation Analysis for Piping Leak Detection
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Solution Overview
Problem
Existing exhaust gas purification systems for internal combustion engines face challenges in accurately detecting abnormalities in pressure difference measurements due to piping breakage or leaks, which can lead to inaccurate particulate matter accumulation detection and potential filter damage.
Innovation Solution
An abnormality detection apparatus that uses a differential pressure sensor to measure pressure differences across a particulate filter, employing pulsation measurement and abnormality detection means to identify piping issues by setting reference values based on engine parameters and ensuring balanced pressure pulsation phases through equal piping lengths, thereby enhancing detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a differential pressure sensor and pressure introduction piping are used to detect pressure difference across the particulate filter, then the regeneration timing can be determined accurately, but the piping may break or leak causing detection abnormalities
Solution Approach 1:
The system continuously monitors the pressure difference detection values and compares them against expected ranges. When the detection value falls outside the normal range (indicating possible piping breakage or leak), the system generates an abnormality signal to alert the operator, enabling timely intervention and maintaining system reliability
Solution Approach 2:
The patent introduces a control unit that acts as an intermediary between the differential pressure sensor and the regeneration control system. This control unit processes the raw pressure difference data, validates its合理性, and only uses it for regeneration timing determination when the data is confirmed to be reliable, preventing erroneous regeneration decisions due to piping abnormalities
2Productivity
If the pressure difference detection system is used to monitor particulate matter accumulation, then regeneration timing can be optimized, but false alarms may occur due to piping abnormalities
Solution Approach 1:
The system implements a feedback mechanism where the detected pressure difference values are continuously monitored and compared against valid ranges. When piping abnormalities cause detection values to deviate from expected patterns, the system identifies these as false alarm conditions and excludes them from regeneration timing calculations, maintaining accurate productivity optimization
Solution Approach 2:
The control unit performs preliminary validation of the pressure difference detection values before using them for regeneration timing determination. By checking whether the detection values are within reasonable ranges and consistent with expected patterns, the system prevents false alarms from triggering erroneous regeneration operations, ensuring accurate productivity optimization
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively detects piping abnormalities with high sensitivity, reducing false alarms and ensuring timely regeneration of the particulate filter, thereby preventing overheating and damage, while improving detection accuracy for downstream piping issues.
Implementation Method 1
detecting a pressure difference at an inlet and an outlet of the particulate filter by using the differential pressure sensor
Implementation Method 2
pulsation measurement means for measuring a magnitude of pulsation of a detection value of the pressure difference
Data Source
AI summary
Unless an abnormality exists in piping introducing a pressure from front and rear of DPF 22 into a differential pressure sensor 45, pulsations of pressure propagation through an exhaust passage 21 is offset in a detection value of a pressure difference of the differential pressure sensor 45, and an amplitude of the detection value of the DPF pressure difference resulting from pulsation of the pressure becomes small. If a crack exists in one of the piping 3a and 3b, the influence of a pulsation of the pressure appears in the DPF pressure difference and the amplitude of the detection value of the DPF pressure difference becomes large. The amplitude of the detection value of the DPF pressure difference is compared with the reference value and is detected as being abnormal when it is large, utilizing the phenomenon described above.