Multistage Fuel Injection Timing Control for Engine Valve Interference
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Solution Overview
Problem
In internal combustion engines employing both variable valve actuation control (VVC) systems and multistage fuel-injection systems, there is an increased tendency for undesirable interference between engine valve timing control and fuel injection control, leading to inefficiencies such as fuel leakage, reduced engine power output, and deteriorated emission control performance due to misalignment of sub-injection timings with valve opening and closing events.
Innovation Solution
A multistage fuel-injection internal combustion engine with a VVC system that cooperatively controls sub-injection timings based on intake valve closure timing and exhaust valve open timing, using sensors to detect valve lift characteristics and operating conditions, and adjusts valve timings to optimize injection timing alignment across different engine operating ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sub-injection timing is independently controlled based on engine operating conditions, then fuel injection flexibility is improved, but interference with valve timing control increases
Solution Approach 1:
The patent merges the control of sub-injection timing with valve timing control by establishing a fixed relational setting between sub-injection timing and either intake valve closure timing or exhaust valve open timing. This integration ensures that fuel injection control and valve timing control work cooperatively rather than independently, preventing interference while maintaining injection flexibility.
Solution Approach 2:
The system dynamically adjusts sub-injection timing based on the operational state of the VVC system. When the VVC system is operating within normal parameters, sub-injection timing follows its predetermined relational setting with valve timing. When VVC system state changes occur, the control system adapts sub-injection timing accordingly, ensuring continuous cooperative operation.
2Reliability
If intake valve closure timing is retarded to control ignition lag, then combustion state control is improved, but sub-injection timing alignment deteriorates
Solution Approach 1:
The control system continuously monitors the actual intake valve closure timing and uses this feedback to adjust sub-injection timing. By establishing a predetermined relational setting between sub-injection timing and valve timing events, the system automatically compensates for valve timing adjustments, maintaining precise injection timing alignment regardless of ignition lag control requirements.
3Object-generated harmful factors
If multistage fuel injection is implemented to improve combustion, then emission control performance is improved, but fuel leakage risk increases
Solution Approach 1:
The system performs preliminary alignment of sub-injection timing with valve timing events by establishing predetermined relational settings before injection occurs. By ensuring that sub-injection is timed to occur when the intake valve is closed or exhaust valve is open, the system prevents fuel leakage while maintaining the emission control benefits of multistage injection.
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 approach prevents fuel leakage and enhances engine power output and emission control performance by ensuring precise alignment of fuel injection with valve events, thereby improving combustion efficiency and reducing interference between VVC and fuel injection control systems.
Implementation Method 1
air alone is compressed during the compression stroke, and then fuel, which is sprayed or injected into the cylinder, is self-ignited due to a temperature rise of the compressed air (heat produced by compressing the incoming air)
Implementation Method 2
fuel, which is sprayed or injected into the cylinder, is self-ignited due to a temperature rise of the compressed air
Data Source
AI summary
In a multi-stage fuel-injection internal combustion engine employing a fuel injection system and a variable valve actuation system, engine valve timings are variably controlled depending on engine operating conditions. An electronic engine control unit is configured to execute cooperative control of the timing of sub-injection, injected before main injection, responsively to intake valve closure timing, and also to execute cooperative control of the timing of sub-injection, injected after the-main injection, responsively to exhaust valve open timing.