Gas Injection Timing Control for Premature Combustion
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Solution Overview
Problem
Existing methods for determining fuel injection timing in internal combustion engines are insufficient for gaseous fuels and fuel mixtures, as they do not account for longer injection durations and other critical parameters such as physical dimensions of the engine, leading to inefficient fuel injection.
Innovation Solution
A method that determines the start, end, and duration of gas injection in an internal combustion engine based on various operating parameters, ensuring the start of injection does not occur before the earliest possible start, thereby optimizing fuel injection for gaseous fuels by adjusting parameters like engine load and valve timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If injection timing is calculated based on engine revolution rate and load, then injection timing can be determined for liquid fuels, but the method is insufficient for gaseous fuels requiring longer injection duration
Solution Approach 1:
The patent changes the calculation parameters from simple engine revolution rate and load to a comprehensive set including intake manifold pressure, temperature, density, and speed of sound. This allows the same injection timing calculation method to accurately accommodate both liquid and gaseous fuels with different physical properties, resolving the adaptability issue while maintaining reliability through physics-based calculations.
2Device complexity
If standard injection timing calculation is used, then calculation simplicity is maintained, but other critical parameters such as physical dimensions of engine components are not accounted for
Solution Approach 1:
The patent replaces complex mechanical measurement systems with a computational approach using the speed of sound in the intake charge. By calculating the time for the sound wave to travel from the injector to the intake valve and back, the system accurately determines injection timing without requiring complex physical dimension measurements, thus maintaining calculation simplicity while achieving high precision.
3Ease of operation
If injection timing does not account for gaseous fuel characteristics, then standard control routines can be used, but premature injection occurs leading to hydrocarbon release
Solution Approach 1:
The patent implements a feedback mechanism using intake manifold pressure and temperature sensors to continuously monitor the state of the intake charge. This feedback allows the control system to dynamically adjust injection timing based on actual conditions, preventing premature injection and hydrocarbon release while maintaining operationally simple control routines through automated real-time adjustments.
Data Source
AI summary
Various systems and methods for determining a start of fuel injection including a gaseous fuel in an internal combustion engine are provided. In one embodiment, an end of gas injection, a duration of gas injection, and a start of gas injection in an induction pipe of a cylinder of an internal combustion engine is determined based on one or more operating parameters. An earliest possible start of gas injection is further determined, and if the start of gas injection is before the earliest possible start of gas injection, at least one of the one or more operating parameters is modified such that the start of gas injection does not occur before the earliest possible start of gas injection.