Engine Control Device Waste Gate Valve Dynamics
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Solution Overview
Problem
In engines with turbochargers, low load operating conditions lead to insufficient fuel-air mixing, resulting in decreased combustion efficiency and potential fuel deposits, which affect fuel economy and engine oil dilution.
Innovation Solution
A control apparatus that adjusts the injection amounts and ratios of fuel injection valves and controls the waste gate valve to optimize turbocharger boost pressure, enhancing combustion stability and fuel economy by managing the waste gate valve's opening based on engine operating states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the injection amount from the second fuel injection valve is increased to improve combustion stability, then combustion stability improves, but fuel economy deteriorates due to insufficient fuel-air mixing in low load conditions
Solution Approach 1:
The waste gate valve opening degree is dynamically adjusted based on the injection amount from the first fuel injection valve. When the injection amount increases, the valve opening degree increases to allow more exhaust gas to bypass the turbine, reducing turbine drive load and improving fuel-air mixing efficiency, thereby maintaining combustion stability while improving fuel economy
Solution Approach 2:
The control method changes the opening degree parameter of the waste gate valve in response to changes in the injection amount parameter. By adjusting the valve opening degree parameter according to the injection amount, the system optimizes the balance between combustion stability and fuel economy
2Use of energy by moving object
If the waste gate valve is kept open to reduce turbine drive load and improve fuel economy, then fuel economy improves, but combustion stability deteriorates due to insufficient supercharging effect
Solution Approach 1:
The waste gate valve opening degree is dynamically controlled based on real-time injection amount data. When injection amount is low, the valve opening is reduced to maintain supercharging effect and combustion stability. When injection amount increases, the valve opening increases to reduce turbine load and improve fuel economy
Solution Approach 2:
The control method uses feedback from the injection amount sensor to automatically adjust the waste gate valve opening degree. This closed-loop control ensures that the valve opening is optimized according to actual injection conditions, balancing combustion stability and fuel economy
3Stability of the object's composition
If the injection amount from the first fuel injection valve is increased to improve fuel-air mixing, then fuel-air mixing improves, but turbine drive load increases due to reduced exhaust gas flow through the turbine
Solution Approach 1:
The waste gate valve acts as an intermediary device that manages the trade-off between fuel-air mixing and turbine drive load. By providing an exhaust bypass path, it allows the system to increase injection amount for improved fuel-air mixing while the valve compensates for the reduced exhaust flow through the turbine by adjusting the bypass amount
Solution Approach 2:
The system changes the opening degree parameter of the waste gate valve in response to changes in injection amount. When injection amount increases to improve fuel-air mixing, the valve opening degree increases proportionally to maintain appropriate turbine drive load
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
The solution improves combustion stability and fuel economy by reducing turbine drive load and enhancing supercharging effects, ensuring better fuel-air mixing and minimizing fuel deposits.
Implementation Method 1
drives an exhaust turbine by an exhaust gas flowing through an exhaust passage
Implementation Method 2
supercharges air by a compressor coupled to the exhaust turbine
Implementation Method 3
adjusting the boost pressure of the turbocharger
Data Source
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AI summary
In a control apparatus of an engine having a first fuel injection valve for injecting fuel into an intake path of the engine, a second fuel injection valve for injecting fuel into a combustion chamber of the engine, a supercharger for supercharging intake air for the engine, and a waste gate valve for opening and closing an exhaust bypass passage for bypassing a turbine of the supercharger, the waste gate valve is controlled to act in a closing direction in response to an increase in the injection amount of fuel injected from the first fuel injection valve, in a region where the injection amount of fuel from the first fuel injection valve is larger than the injection amount of fuel from the second fuel injection valve.