Exhaust Gas Purification Control Module for Diesel Vehicles
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Solution Overview
Problem
Diesel vehicles equipped with selective catalytic reduction (SCR) systems face frequent tank emptying issues, leading to potential immobilization due to legal pollution constraints, and switching to Lean NOx Trap (LNT) mode results in inefficient consumption and pollution control.
Innovation Solution
A control module that monitors engine speed and instantaneous power to selectively switch between active SCR and LNT modes, optimizing nitrogen oxide reduction by activating SCR at high engine loads and switching to LNT at lower loads, thereby managing tank autonomy and fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If SCR mode is used continuously, then nitrogen oxide reduction efficiency is improved, but fuel consumption increases and tank autonomy decreases
Solution Approach 1:
The system dynamically switches between SCR and LNT modes based on real-time monitoring of tank fluid level. When the level is sufficient, SCR mode is activated for optimal nitrogen oxide reduction. When the level drops below a threshold, the system automatically transitions to LNT mode to conserve fuel and extend operational autonomy, creating a dynamic adaptation to resource availability.
Solution Approach 2:
The control system monitors the fluid level parameter in the SCR tank and uses this parameter to determine operational mode. By changing the operational parameter (mode selection) based on the fluid level parameter, the system optimizes the balance between emission reduction effectiveness and fuel consumption, extending tank autonomy while maintaining compliance.
2Object-generated harmful factors
If SCR mode is used continuously, then nitrogen oxide reduction efficiency is improved, but tank autonomy decreases requiring frequent refilling
Solution Approach 1:
The system adapts its operational mode dynamically based on the fluid level in the SCR tank. When fluid is abundant, SCR provides optimal emission control. When fluid becomes scarce, the system automatically switches to LNT mode, extending the duration of operation between refilling events and maintaining compliance with emission regulations throughout the extended autonomy period.
Solution Approach 2:
The control system proactively monitors the fluid level and switches to LNT mode before the tank is completely depleted, preventing immobilization. This preliminary action ensures continuous operational autonomy and avoids legal issues related to non-compliance, allowing the vehicle to operate for extended periods without refilling.
3Duration of action of moving object
If switching to LNT mode is implemented, then tank autonomy is improved and fuel consumption is reduced, but nitrogen oxide reduction efficiency decreases
Solution Approach 1:
The system dynamically selects the optimal mode based on fluid availability. LNT mode is activated only when necessary (low fluid level) to extend autonomy, while SCR mode is used whenever possible to maintain optimal nitrogen oxide reduction efficiency. This dynamic switching ensures the system achieves both extended autonomy and effective emission control.
Solution Approach 2:
The control system uses the fluid level parameter as a decision criterion for mode selection. By changing the operational mode parameter based on this measurement, the system optimizes the trade-off between tank autonomy duration and nitrogen oxide reduction efficiency, ensuring compliance is maintained across different operational conditions.
4Duration of action of moving object
If frequent mode switching occurs, then tank autonomy is optimized, but system complexity and control difficulty increase
Solution Approach 1:
The control system implements a simple dynamic switching logic based on a single threshold parameter (fluid level). This straightforward approach optimizes tank autonomy through adaptive mode selection while keeping the control system relatively simple, avoiding excessive complexity despite the dynamic nature of the switching operation.
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 approach enhances fuel efficiency, reduces nitrogen oxide reducer consumption, and maintains effective pollution control by activating SCR at high engine loads and using LNT at low loads, optimizing depollution and extending tank autonomy.
Implementation Method 1
a module for the selective catalytic reduction of nitrogen oxide by injection of a reductant in the form of a urea solution or of gaseous ammonia
Implementation Method 2
a module for the absorption of nitrogen oxides by lean operation in passive mode
Implementation Method 3
the selective catalytic reduction module in active mode producing an elimination of the nitrogen oxides stored in the absorption module
Data Source
Figure 1~2
AI summary
The invention relates to a motor vehicle comprising a control module capable of selectively placing the selective catalytic reduction module and/or the nitrogen oxide absorption module by lean operation in active mode according to at least one parameter (R, P) among an indicative parameter of the engine speed (R) and an indicative parameter of the instantaneous power (P) produced by the engine.