SDPF Regeneration Control for Crack Prevention
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Solution Overview
Problem
The existing methods for controlling the regeneration of selective catalytic reduction (SCR) on diesel particulate filters (DPF) fail to prevent cracks due to excessive urea injection, which causes temperature gradients and stress differences between the center and outer portions of the filter during regeneration.
Innovation Solution
A method that determines the entrance condition, target quantity of urea injection, and accumulates urea before regeneration, increasing the filter temperature to 400-500°C to gasify or oxidize deposited urea and remove soot, thereby preventing cracks by maintaining a uniform temperature distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If urea is excessively injected during regeneration of SDPF, then the SCR purification performance is improved, but a ring off crack is generated in the filter due to temperature gradient difference
Solution Approach 1:
The control method determines the accumulated quantity of urea injection before regeneration and identifies whether it reaches a target quantity that generates cracks. By performing this assessment in advance, the system can prevent excessive urea injection that would cause temperature gradients and cracks in the filter structure
Solution Approach 2:
The system monitors the accumulated quantity of urea injection and uses this feedback to control the regeneration process. When the accumulated quantity reaches a level that would cause cracking, the control method adjusts the regeneration parameters to maintain purification performance while preventing structural damage
2Productivity
If urea injection quantity is increased to ensure complete regeneration, then soot removal efficiency is improved, but temperature deviation between center and lower end portions increases causing cracks
Solution Approach 1:
The control method differentiates the regeneration temperature based on the accumulated urea injection quantity. When urea accumulation is detected, the system applies different temperature control strategies to different regions of the filter, particularly controlling the temperature in the lower end portion to prevent excessive temperature deviation and cracking while maintaining effective soot removal
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 effectively controls the regeneration of SDPF by determining the engine operation region and urea injection quantities, preventing incomplete regeneration and cracks, and ensuring efficient urea removal.
Implementation Method 1
increasing the filter temperature to 400-500°C to gasify or oxidize deposited urea
Implementation Method 2
increasing the filter temperature to 400-500°C to gasify or oxidize deposited urea
Implementation Method 3
increasing the temperature of the filter to at least 600° C. and removing soot generated by the gasification or the oxidation
Data Source
AI summary
A method of controlling regeneration of a selective catalytic reduction (SCR) on a diesel particulate filter (DPF) (SDPF) by using an increase in a temperature of exhaust gas of a vehicle include confirming whether the vehicle is in an idle state or whether the vehicle enters a re-start after a start-stop before the regeneration of the SDPF and determining an entrance condition, determining, when the entrance condition is satisfied, a quantity of urea injection and a quantity of urea accumulated before the regeneration and determining whether the determined quantity of urea injection does not exceed a target quantity of urea, and increasing a temperature within a filter of the SDPF to a predetermined value or more during the regeneration of the SDPF and removing urea deposited at the lower end portion of the filter.