Intake Pressure Feedback for Warm-Up Fuel Injection Timing
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Solution Overview
Problem
During engine warm-up, the accumulation of deposits on intake valves reduces the flow of gas in the cylinder, making it difficult to form a rich air-fuel mixture around the spark plug, leading to reduced ignitability due to the inability to detect the decrease in gas flow effectively.
Innovation Solution
An engine system that uses an intake pressure sensor to detect intake pressure at a specific timing during rapid warm-up, comparing it to a predetermined threshold to determine if the pressure is below a first threshold, and if so, advances the fuel injection timing to ensure the air-fuel mixture reaches the spark plug before ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the engine operates during rapid warm-up, then the engine temperature increases quickly, but deposits accumulate on intake valves reducing gas flow and ignitability
Solution Approach 1:
The system performs preliminary detection of intake pressure during rapid warm-up to identify deposit accumulation before it severely impacts ignitability. By detecting pressure deviations from the threshold during the warm-up phase, the system can proactively adjust fuel injection timing to maintain proper air-fuel mixture formation and preserve ignitability.
Solution Approach 2:
The system changes the fuel injection timing parameter in response to detected intake pressure conditions. When intake pressure falls below the threshold indicating deposit accumulation, the system advances the fuel injection timing to allow more time for fuel vaporization and air-fuel mixture formation, thereby maintaining ignitability despite reduced gas flow.
2Stability of the object's composition
If fuel injection timing is delayed to accommodate reduced gas flow, then the air-fuel mixture has more time to form, but ignitability decreases due to later injection timing
Solution Approach 1:
The system dynamically adjusts the fuel injection timing based on real-time intake pressure detection. Rather than using a fixed timing, the system varies the injection timing within a predetermined range according to the detected intake pressure conditions, optimizing the balance between air-fuel mixture formation and ignitability maintenance.
Solution Approach 2:
The system uses intake pressure detection as feedback to determine appropriate fuel injection timing. The detected intake pressure during rapid warm-up provides information about deposit accumulation and gas flow conditions, which feeds back into the control logic to adjust injection timing and maintain proper combustion.
3Measurement precision
If the intake pressure threshold is set low, then detection sensitivity increases for deposit accumulation, but false positives increase reducing system reliability
Solution Approach 1:
The system establishes a safety margin by setting the intake pressure threshold at a level that accounts for normal variations during rapid warm-up. This threshold acts as a cushion, allowing for normal pressure fluctuations while still detecting significant deviations caused by deposit accumulation, thereby reducing false positives while maintaining detection sensitivity.
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 allows for maintaining ignitability by ensuring the fuel injection timing is advanced when deposits reduce gas flow, preventing a decrease in ignitability.
Implementation Method 1
The intake pressure sensor is configured to detect intake pressure inside the intake manifold
Data Source
AI summary
An engine system includes: an engine including a piston, cylinder, intake valve, and exhaust valve; an intake manifold introducing intake air into the engine; an intake pressure sensor detecting intake pressure; and a control device including a processor(s) and a memory(ies). A first threshold, based on the intake pressure at a first timing during rapid warm-up in the engine's initial state, is prepared. The first timing is within one cycle of the engine, after an intake valve opening timing, and before the piston reaches a bottom dead center. The processor(s) execute a process including: obtaining intake pressure at the first timing during warm-up in the engine's current state; determining whether the intake pressure is less than the first threshold; and when the intake pressure is less than the first threshold, advancing a fuel injection timing according to a pressure difference between the first threshold and the intake pressure.