Reductant Injector Coolant System for SCR Timing Control
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Solution Overview
Problem
Existing exhaust treatment systems face challenges in efficiently controlling the introduction of reductant agents in selective catalytic reduction (SCR) systems, leading to inadequate NOx conversion and excessive reductant agent slippage due to varying operating conditions, which result in inefficient conversion and deposit buildup.
Innovation Solution
A system and method that incorporates a coolant system to monitor and adjust the injection timing of the reductant agent based on coolant temperature, ensuring optimal injection timing and reducing the risk of overheating or underheating of the injector, thereby minimizing reductant agent leakage and deposit formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reductant agent injection timing is not adjusted based on temperature, then the system structure remains simple, but NOx conversion efficiency deteriorates and reductant agent slippage increases
Solution Approach 1:
The system uses coolant temperature sensor feedback to continuously monitor temperature conditions and dynamically adjusts reductant agent injection timing through the controller, creating a closed-loop control system that optimizes NOx conversion efficiency while preventing slippage
Solution Approach 2:
The injection timing parameter is dynamically changed based on coolant temperature conditions, with the controller adjusting injection moments to match thermal conditions in the exhaust system, ensuring optimal chemical reaction conditions for NOx reduction
2Reliability
If excess reductant agent is supplied to maximize conversion, then NOx conversion efficiency improves, but reductant agent slippage and deposit formation increase
Solution Approach 1:
The reductant agent supply rate is dynamically adjusted based on real-time temperature conditions rather than using a fixed supply strategy, allowing the system to optimize conversion efficiency while preventing excess agent slippage and deposit formation by matching supply to actual reaction conditions
3Object-generated harmful factors
If reductant agent injection timing is delayed, then deposit formation is reduced, but NOx conversion efficiency deteriorates
Solution Approach 1:
The injection timing parameter is dynamically adjusted based on temperature conditions, delaying injection when temperatures are high to prevent deposits while advancing injection when temperatures are lower to maintain conversion efficiency, thereby optimizing both parameters simultaneously
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 the efficiency of NOx conversion by adjusting reductant agent injection timing in response to coolant temperature, reducing slippage and deposit buildup, thereby improving the overall performance and longevity of the SCR system.
Implementation Method 1
The coolant system also circulates coolant proximately about the injector to affect a temperature of the injector
Data Source
AI summary
A system and method controls injection of a reductant agent in a selective catalytic reduction system. The system and method include an injector injecting the reductant agent to an exhaust system directing exhaust from a power system. A coolant system circulates coolant proximate to the injector. A coolant temperature sensor monitors a coolant temperature of the coolant. A controller adjusts the injection timing of the injector based at least in part on the coolant temperature.