Detecting SCR Catalytic Converter Emulators via Pressure Profile Analysis
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Solution Overview
Problem
SCR catalytic converter emulators deceive control units into thinking the system is functioning properly, allowing bypassing of components and reducing the need for urea-water solutions, thus harming the environment and damaging manufacturers' reputations, as they simulate proper operation without generating fault codes.
Innovation Solution
A method to detect SCR catalytic converter system emulators by operating the system in a test state, measuring specific pressure profiles, and analyzing Fourier components to differentiate between genuine and emulated systems, allowing for the identification of emulators without disrupting normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an emulator is used to simulate SCR catalytic converter operation, then the system appears to function properly to the control unit, but the actual NOx reduction function is lost and environmental damage occurs
Solution Approach 1:
The control unit performs preliminary diagnostic actions by introducing test pressure variations and measuring the resulting pump pressure responses before normal operation. This preliminary detection prevents emulators from successfully deceiving the system, as the emulator cannot replicate the physical pump's dynamic pressure response to varying test inputs.
Solution Approach 2:
The system establishes a feedback loop where the control unit monitors the pump pressure signal in response to introduced test pressure variations. By comparing the actual pressure response against expected characteristics of a real pump system, the feedback mechanism identifies emulator presence and prevents the harmful effect of simulated operation without actual NOx reduction.
2Quantity of substance
If an emulator is installed to bypass SCR components, then urea-water solution consumption is reduced, but the SCR catalytic converter system cannot actually reduce NOx emissions
Solution Approach 1:
The control unit introduces test pressure variations and measures pump pressure responses before allowing normal operation. This preliminary detection ensures that even if an emulator is present and urea consumption is reduced, the system identifies the emulator and prevents false operation, maintaining actual NOx reduction capability.
Solution Approach 2:
The system continuously monitors pump pressure signals and compares them against expected physical pump characteristics. This feedback mechanism detects when an emulator is artificially reducing urea consumption without providing actual SCR function, allowing the system to identify and respond to the harmful effect of increased NOx emissions.
3Ease of operation
If an emulator simulates SCR system operation, then fault codes are not generated by diagnostic tools, but the system is actually compromised and fraudulent
Solution Approach 1:
The control unit performs preliminary diagnostic tests by introducing test pressure variations and measuring actual pump pressure responses. This preliminary action exposes emulators that would otherwise pass standard diagnostic checks, as the emulator cannot replicate the dynamic physical response of a real pump to varying pressure inputs.
Solution Approach 2:
The system establishes feedback monitoring of pump pressure signals against expected physical characteristics. This feedback mechanism generates fault codes when an emulator is detected, even though standard diagnostic tools might not identify the fraud. The feedback loop maintains system integrity by detecting the mismatch between simulated and actual pump behavior.
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
Effectively detects the presence of emulators, ensuring the integrity of the SCR technology and preventing environmental and reputational damage by distinguishing between authentic and simulated system behaviors.
Implementation Method 1
The pump feeds the reducing agent stored in the reducing agent tank to the metering valve
Implementation Method 2
The pressure sensor is connected to the reducing agent line downstream of the pump and upstream of the metering valve
Implementation Method 3
A Fourier component of a Fourier transform of a pressure profile is determined at a specified frequency
Data Source
AI summary
The invention concerns a method (200) of detecting an emulator for an SCR catalytic converter system (10) with the following steps: operating the SCR catalytic converter system (10) in a test state; and measuring a test variable of the SCR catalytic converter system (10); and deciding whether the test variable is behaving as for an SCR catalytic converter system (10) with or without an emulator.