EGR Valve Control Module for Catalyst Overheating Prevention
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Solution Overview
Problem
Internal combustion engine systems with exhaust gas recirculation face issues where foreign matter like soot can cause the exhaust regulating valve to malfunction, leading to incomplete closure, resulting in overheating of the exhaust purification catalyst and worsened emissions due to insufficient recirculation.
Innovation Solution
Incorporating a closing abnormality detection module and a control module that adjusts fuel injection to increase fuel flow when the exhaust regulating valve is not fully closed, especially during high-load operation, to prevent catalyst overheating and maintain efficient recirculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fuel supply amount is corrected to be larger to prevent catalyst overheating, then catalyst temperature control is improved, but fuel consumption increases
Solution Approach 1:
The control module continuously monitors the exhaust regulating valve position and compares it with the target position. When a closing abnormality is detected (valve position deviates from target), the system automatically adjusts fuel injection to increase fuel supply for catalyst temperature control, and reverses the adjustment when the abnormality is resolved, creating a closed-loop feedback system that balances temperature control with fuel efficiency
2Object-generated harmful factors
If exhaust recirculation is increased to reduce NOx emissions, then emission control is improved, but catalyst overheating risk increases
Solution Approach 1:
The closing abnormality detection module proactively detects potential valve malfunction before it causes complete recirculation failure. When an abnormality is detected, the control module preemptively increases fuel supply to prevent catalyst overheating, rather than waiting for temperature to rise to dangerous levels or recirculation to completely fail
Solution Approach 2:
The system dynamically adjusts fuel injection based on real-time valve position monitoring. The control module continuously modifies the fuel supply amount according to the degree of valve closure abnormality, transitioning smoothly between normal operation and abnormality compensation modes to maintain both emission control and temperature management
3Object-generated harmful factors
If exhaust regulating valve is controlled to be totally closed to maximize recirculation, then emission control is improved, but system reliability decreases due to foreign matter accumulation
Solution Approach 1:
The closing abnormality detection module provides continuous feedback on valve position accuracy. When the valve fails to reach the target closed position due to foreign matter, the system detects this deviation and automatically compensates by adjusting fuel injection, maintaining system reliability without sacrificing emission control performance
Solution Approach 2:
The system performs self-diagnosis through the closing abnormality detection module that continuously monitors valve position. When foreign matter causes valve malfunction, the system automatically detects and compensates without requiring external intervention, maintaining reliable operation throughout the service life
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 solution effectively prevents unexpected overheating of the exhaust purification catalyst, thereby reducing emissions and ensuring consistent engine performance even with foreign matter-induced valve malfunctions.
Implementation Method 1
an exhaust purifying catalyst that purifies the exhaust of the internal combustion engine
Implementation Method 2
the degree of clogging in an exhaust gas recirculation conduit or the exhaust gas recirculation valve becomes more against the smaller differential pressure between the pressure in the air intake conduit while opening the exhaust recirculation valve and the pressure in the air intake conduit while closing the exhaust recirculation valve
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Upon no detection of the closing abnormality where the EGR valve does not become in the totally closed state (when the flag Fa is value '0'), the engine is controlled using the target fuel injection amount Qf* obtained from the correction of the basic fuel injection amount Qftmp toward the increase direction, in the case that the engine is operated together with the recirculation of the exhaust in the preset high-load operation range (when the flag Fi is '1') (S220, S230, S250 and S260). Upon detection of the closing abnormality (when the flag Fa is value '1'), the engine is controlled using the target fuel injection amount Qf* obtained from the correction of the basic fuel injection amount Qftmp toward the increase direction, in the case that the engine is operated together with the recirculation of the exhaust in the whole range that the engine is operable together with the recirculation of the exhaust (S220, S250, S260).