Hybrid Vehicle Fuel Pressure Control for Deposit Management
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Solution Overview
Problem
In hybrid electric vehicles, excessive fuel injection during engine idle operation due to high fuel injection pressure can lead to emission deterioration and increased deposits on the in-cylinder injection valve, causing inconveniences such as worsening emissions and deposit accumulation.
Innovation Solution
A hybrid electric vehicle system with a controller that adjusts fuel supply pressure to the in-cylinder injection valve based on operational conditions, setting different fuel pressures for deposit removal and non-deposit removal scenarios to prevent excessive fuel injection and deposit accumulation, thereby maintaining optimal emissions and reducing deposit formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel injection pressure of the in-cylinder injection valve is increased to remove deposits, then deposit removal is achieved, but the minimum injection amount exceeds the required injection amount causing excessive fuel injection and emission deterioration
Solution Approach 1:
The fuel supply pressure is made dynamically adjustable with three distinct levels (first, second, and third fuel pressures) based on real-time operational conditions. The controller switches between these pressure levels depending on whether the vehicle is stopped, whether forced charging is being performed, and whether deposit removal is required, thereby optimizing the balance between deposit removal effectiveness and fuel injection appropriateness.
Solution Approach 2:
The invention changes the fuel supply pressure parameter to three different values (first fuel pressure < third fuel pressure < second fuel pressure) based on operational conditions. By adjusting this key parameter, the system achieves deposit removal when necessary while preventing excessive fuel injection during normal idle operation, thus resolving the contradiction between deposit removal effectiveness and emission control.
2Object-generated harmful factors
If the fuel injection pressure is kept low during idle operation to prevent excessive fuel injection, then emission deterioration is avoided, but deposit accumulation on the in-cylinder injection valve increases
Solution Approach 1:
The system implements periodic deposit removal by switching to the second fuel pressure (higher than both first and third pressures) specifically when the vehicle is stopped and deposit removal is determined to be necessary. This periodic high-pressure injection cleans the injection valve jets, preventing long-term accumulation while maintaining low pressure during normal operation to avoid emissions problems.
Solution Approach 2:
The controller proactively determines when deposit removal is necessary and switches to the second fuel pressure before excessive deposits accumulate and cause performance degradation. This preliminary action prevents the contradiction from developing into actual emission deterioration or severe deposit buildup.
3Reliability
If the fuel supply pressure is increased to remove deposits when the vehicle is stopped and forced charging is not being performed, then deposit removal is achieved, but the fuel pressure becomes higher than necessary causing excessive fuel injection
Solution Approach 1:
The fuel supply pressure control is segmented into three distinct levels: first fuel pressure for normal operation, second fuel pressure for deposit removal during forced charging, and third fuel pressure for deposit removal during idle operation. This segmentation allows the system to use the appropriate pressure level for each specific condition, avoiding the use of excessively high pressure when it is not needed.
Data Source
AI summary
When the vehicle is stopped and removal of deposits is not required, and forced charging of a power storage device is not being performed, the controller controls the fuel supply device so that a supply fuel pressure is at the first fuel pressure. When the vehicle is stopped and the removal of deposits is required, and the forced charging of the power storage device is being performed, the controller controls the fuel supply device so that the supply fuel pressure is at a second fuel pressure higher than the first fuel pressure. When the vehicle is stopped and the removal of deposits is required, and the forced charging of the power storage device is not being performed, the controller controls the fuel supply device so that the supply fuel pressure is at a third fuel pressure higher than the first fuel pressure and lower than the second fuel pressure.