Swirl Control Valve Transient Load Management
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Solution Overview
Problem
In internal combustion engines, during transient operations, the suction intake gas amount takes time to adjust to changing engine loads, leading to mismatched fuel injection and intake gas amounts, which affects the swirl flow strength and heat efficiency.
Innovation Solution
An internal combustion engine with a swirl control valve and load detection system that dynamically adjusts the swirl ratio based on changing engine loads and suction intake gas amounts, increasing the swirl ratio when the load is low and decreasing it when high, to maintain optimal heat efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the swirl control valve is closed to generate a strong swirl flow when engine speed is low, then fuel and air mixing is improved, but cooling loss increases when engine load is high
Solution Approach 1:
The patent applies dynamics by making the swirl control valve opening degree variable based on real-time detection of suction intake gas amount and engine load. Instead of using a fixed opening degree for low engine speeds, the system dynamically adjusts the valve position to generate appropriate swirl flow strength, thereby reducing cooling loss during high load conditions while maintaining adequate mixing during low load conditions.
2Productivity
If the fuel injection amount is immediately changed to correspond to the changed engine load, then the fuel injection amount becomes suitable, but the suction intake gas amount does not become suitable due to time delay
Solution Approach 1:
The patent applies feedback by using a suction intake gas amount detection device to continuously monitor the actual intake gas amount and feeding this information back to the control device. The control device then adjusts the swirl control valve opening degree based on the detected intake gas amount, creating a closed-loop control system that compensates for the time delay in intake gas response and maintains appropriate air-fuel ratio during transient operations.
3Ease of operation
If the same swirl flow control is applied during transient operation as during steady operation, then the control method is simple, but heat efficiency is reduced due to mismatched swirl flow strength
Solution Approach 1:
The patent applies parameter changes by adjusting the swirl control valve opening degree parameter based on the detected suction intake gas amount and engine load conditions. During transient operations, the system changes the opening degree parameter to generate appropriate swirl flow strength that matches the actual intake gas amount, thereby maintaining optimal heat efficiency without requiring complex control logic.
Data Source
AI summary
The internal combustion engine comprises a swirl control valve able to change a strength of a swirl generated in a combustion chamber; a load sensor for detecting an engine load; and a control device for controlling the swirl control valve. The control device controls the swirl control valve, when the engine load detected by the load sensor is lower than a predetermined load, so that the swirl ratio is higher when a suction intake gas amount is increasing, compared to when it is decreasing.