Alternating Fuel Injection Valves to Reduce Intake Wall Adhesion
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Solution Overview
Problem
The existing fuel injection control systems for internal combustion engines, which use multiple fuel injection valves, result in excessive fuel adhering to the intake passage walls, leading to fluctuations in air-fuel ratio and worsened exhaust emission and fuel consumption performance during transient operations.
Innovation Solution
A fuel injection control apparatus and method that alternates the use of first and second fuel injection valves every predetermined number of cycles, allowing for either alternative or combined injection modes based on engine operating conditions to minimize fuel adherence to the intake passage walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If both the first fuel injection valve and the second fuel injection valve are used for fuel injection in each cycle, then the fuel injection amount is sufficient, but the fuel amount adhering to the inner wall of the intake passage increases
Solution Approach 1:
The patent implements periodic action by alternately switching between the first and second fuel injection valves in a predetermined sequence. Instead of using both valves simultaneously in each cycle, the system cycles through different valve combinations over multiple engine cycles, allowing the intake passage wall to dry between fuel injection events and reducing cumulative fuel adhesion.
Solution Approach 2:
The patent applies segmentation by dividing the fuel injection function between two separate fuel injection valves (first and second valves) positioned at different locations in the intake passage. This segmentation allows the system to distribute fuel injection events across different spatial locations and time cycles, preventing excessive fuel accumulation at any single location on the intake passage wall.
2Quantity of substance
If more fuel is injected into the intake passage, then the fuel supply to the cylinder is adequate, but the equilibrium amount of adhering fuel to the inner wall of the intake passage increases
Solution Approach 1:
The system uses periodic action by alternating fuel injection between two valves over predetermined cycles. This periodic switching prevents the buildup of a large equilibrium amount of adhering fuel on the intake passage wall, thereby maintaining more stable air-fuel ratio conditions during transient operations while still ensuring adequate fuel supply to the cylinder.
3Quantity of substance
If fuel is injected by both fuel injection valves in each cycle, then the fuel injection coverage is complete, but the fluctuation of air fuel ratio during transient operation becomes large
Solution Approach 1:
The patent implements periodic action by systematically alternating between the first and second fuel injection valves over predetermined engine cycles. This periodic switching strategy reduces the equilibrium amount of fuel adhering to the intake passage wall, thereby minimizing air-fuel ratio fluctuations during transient operations while maintaining complete fuel injection coverage through the alternating valve usage pattern.
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 reduces the equilibrium amount of adhering fuel, stabilizes the air-fuel ratio, improves combustion efficiency, and enhances fuel consumption performance by optimizing fuel injection patterns according to engine conditions.
Implementation Method 1
the fuel amount from the fuel injected from each fuel injection valve adhering to an inner wall of an intake passage increases
Data Source
AI summary
The present invention relates to a fuel injection control apparatus for controlling fuel injection and a method therefor in an engine having first and second intake passages provided with first and second fuel injection valves, respectively. Fuel injection modes using the two injection valves include an alternative injection mode in which the first and second fuel injection valves are alternately operated every predetermined number of cycles and a combined injection mode in which both the first and second fuel injection valves are used for each cycle. Then, the combined injection mode is selected in a full load range. In a partial load range, the alternative injection mode is selected in a cold state and the combined injection mode is selected after warm-up. Accordingly, it is possible to reduce an equilibrium amount of adhering fuel to an inner wall of an intake passage.