Fuel Injection Control for Engine Warm-Up Smoke and Catalyst Activation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel injection control systems for internal combustion engines face challenges in efficiently managing fuel injection during warm-up operations, leading to increased smoke generation and reduced atomization due to prolonged fuel injection times, and struggle to swiftly activate catalysts for emission control.
Innovation Solution
A fuel injection control apparatus that performs separate first and second injection operations in the intake and compression strokes, respectively, with a selector choosing between these operations based on the engine's warm-up state to optimize catalyst activation and minimize smoke generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If fuel injection is performed once during the intake stroke during warm-up operation, then the injection time becomes longer, but this causes fuel to penetrate into the combustion chamber and adhere to the wall, lowering atomization degree and facilitating smoke generation
Solution Approach 1:
The fuel injection process is divided into two separate injection operations: a first injection during the intake stroke and a second injection during the compression stroke. This segmentation reduces the injection time during the intake stroke, preventing fuel from adhering to the combustion chamber wall and improving atomization, while still delivering the total required fuel amount to achieve catalyst activation during warm-up operation.
2Object-generated harmful factors
If fuel injection is performed twice during the intake stroke during warm-up operation, then smoke generation is reduced, but the catalyst activation speed is slowed down
Solution Approach 1:
The fuel injection is segmented into two operations at different strokes: first injection during intake stroke for atomization control and second injection during compression stroke for rapid combustion and catalyst activation. This resolves the contradiction by achieving both smoke reduction through proper timing and fast catalyst activation through compression stroke injection.
Solution Approach 2:
The fuel injection system performs periodic injection operations at different phases of the combustion cycle. During warm-up, the system executes first injection in the intake stroke followed by second injection in the compression stroke, creating a periodic pattern that optimizes both atomization and catalyst heating speed.
3Object-generated harmful factors
If regular fuel injection control is performed with single injection during intake stroke when not in warm-up mode, then atomization is improved, but catalyst activation is not prioritized
Solution Approach 1:
The injection control system dynamically adjusts its operation based on engine conditions. During normal operation, it performs single injection during the intake stroke for optimal atomization. During warm-up operation, it dynamically switches to two-stage injection (intake stroke + compression stroke) to prioritize catalyst activation while maintaining acceptable atomization through the first injection phase.
Data Source
AI summary
A fuel injection control apparatus includes a first injection controller, a second injection controller, and a selector. The first injection controller is configured to perform a first injection operation in an intake stroke and is configured to perform a second injection operation in a compression stroke. The second injection controller is configured to perform both the first injection operation and the second injection operation in the intake stroke. The selector is configured to select fuel injection performed by the first injection controller when an internal combustion engine is in a warm-up operating state and is configured to select fuel injection performed by the second injection controller when the internal combustion engine is not in the warm-up operating state.