Exhaust Gas Purification Regeneration Control Method
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Solution Overview
Problem
Existing exhaust gas purification systems face challenges in efficiently regenerating NOx purification capability and preventing reducing agent flow during NOx and PM regeneration, leading to suboptimal NOx reduction and increased fuel consumption.
Innovation Solution
A regeneration control method that dynamically adjusts the reducing agent concentration in the exhaust gas by changing the air-fuel ratio in real-time during regeneration, using a reducing agent supplying apparatus and control unit to optimize the supply and prevent agent flow to the downstream side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fixed amount injection of reducing agent is performed during NOx regeneration, then the reducing agent supply is simplified, but the reducing agent concentration cannot be adjusted to match temporal changes in regeneration conditions, leading to suboptimal NOx reduction and increased fuel consumption
Solution Approach 1:
The patent applies dynamics by transitioning from fixed amount injection to dynamic concentration adjustment of the reducing agent. The control unit modifies the injection amount based on temporal changes in regeneration conditions (such as exhaust gas flow rate, temperature, and NOx concentration), enabling the system to adapt to varying operational states and optimize both NOx reduction efficiency and fuel consumption in real-time
Solution Approach 2:
The patent implements parameter changes by adjusting the concentration of the reducing agent in the exhaust gas during regeneration. The control unit varies injection parameters (amount, timing, duration) to achieve optimal reducing agent concentration that corresponds to changing regeneration conditions, thereby improving NOx reduction performance while minimizing fuel consumption
2Reliability
If the reducing agent supply is increased to ensure sufficient NOx reduction, then the purification capability is enhanced, but the reducing agent may flow out to the downstream side, causing waste and increased emissions
Solution Approach 1:
The patent applies feedback by using sensors to monitor exhaust gas parameters (such as O2 concentration, NOx concentration, and temperature) downstream of the reducing agent injection point. The control unit continuously adjusts the reducing agent injection amount based on this feedback information, ensuring sufficient NOx reduction while preventing excess reducing agent from flowing to the downstream side, thereby eliminating waste and reducing emissions
Solution Approach 2:
The patent implements partial action by injecting only the necessary amount of reducing agent required for effective NOx reduction at each moment, rather than using a fixed excessive amount. The control unit calculates and delivers the precise injection quantity needed based on real-time regeneration conditions, ensuring adequate purification capability while avoiding over-injection that would cause reducing agent to flow downstream and be wasted
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 recovers purification capability while preventing reducing agent flow to the downstream side, improving NOx reduction efficiency and reducing fuel consumption by optimizing reducing agent supply based on temporal changes in regeneration conditions.
Implementation Method 1
supplying a reducing agent into the exhaust gas, thereby recovering the purification capability of the exhaust gas purification apparatus
Implementation Method 2
a NOx occlusion reduction type catalyst apparatus carrying a NOx occlusion reduction type catalyst... two functions of NOx occlusion and NOx discharging and purification are exhibited
Data Source
AI summary
An exhaust gas purification system including a reducing agent supplying apparatus and an exhaust gas purification apparatus, in that order from an upstream side of an exhaust passage in an internal combustion engine, and a control unit for controlling an amount of reducing agent supplied into the exhaust gas to recover purification capability of the exhaust gas purification apparatus. A concentration of the reducing agent in the exhaust gas, which flows into the exhaust gas purification apparatus, is varied temporally. The reducing agent is supplied in a proper amount to efficiently recover the purification capability. At the same time, the outflow of the reducing agent to the downstream side of the exhaust gas purification apparatus can be prevented.