Virtual Fuel Quality Sensor for Engine Knock Management
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Solution Overview
Problem
Internal combustion engines operate sub-optimally due to variations in fuel quality and engine condition, as existing systems fail to adjust parameters accordingly, leading to inefficiencies throughout the engine's lifespan.
Innovation Solution
A method for operating a multiple combustion chamber internal combustion engine that advances ignition timing in subsets of combustion chambers until a knock event is detected, determining knock margins, and adjusting operating parameters based on these margins to account for fuel quality and engine condition changes, using an engine control module that communicates with sensors and actuators to optimize engine performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If engine operating parameters are selected to maintain operation on the lowest fuel quality and worst engine conditions, then the engine can operate throughout its entire lifespan, but the engine operates sub-optimally when the engine is new and near the end of its lifespan
Solution Approach 1:
The patent applies dynamics by making the ignition timing adjustable and adaptive rather than fixed. The system dynamically modifies ignition timing based on real-time detection of knock events and inferred fuel quality, allowing the engine to optimize performance for current operating conditions rather than being constrained by conservative fixed settings
Solution Approach 2:
The patent implements feedback through knock sensors that detect knock events and provide information back to the control system. This feedback loop enables the system to infer fuel quality and automatically adjust ignition timing to maintain optimal engine efficiency while preventing knock, resolving the contradiction between reliability and productivity
2Productivity
If ignition timing is advanced to maximize power output, then engine productivity increases, but knock events occur more frequently
Solution Approach 1:
The system uses knock sensors to provide real-time feedback on knock events. When knock is detected, the control system automatically retards ignition timing to eliminate knock. When no knock is detected, the system can advance ignition timing to maximize power output, creating a dynamic balance between productivity and knock prevention
Solution Approach 2:
The patent changes the ignition timing parameter dynamically based on detected knock events and inferred fuel quality. By adjusting this critical parameter in real-time, the system optimizes the balance between power output and knock prevention rather than using a fixed conservative setting
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 real-time optimization of engine operation by identifying fuel quality and engine condition changes, reducing the likelihood of knock events and maintaining efficiency throughout the engine's lifespan by adjusting ignition timing and fuel supply accordingly.
Implementation Method 1
an ignition timing of a first subset of the combustion chambers is advanced from an operating ignition timing until a knock event is detected
Data Source
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AI summary
A method of operating a multiple combustion chamber internal combustion engine includes advancing an ignition timing of a first subset of the combustion chambers from an operating ignition timing until a knock event is detected while concurrently operating the remaining combustion chambers at the operating ignition timing. A first knock margin of the first subset of combustion chambers is determined in relation to a difference between the operating ignition timing and the ignition timing at the knock event. A characteristic of a fuel supplied to the combustion chambers is determined in relation to at least the first knock margin.