Fuel Drift Compensation Using Exhaust Oxygen Feedback
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Solution Overview
Problem
Fuel drift in internal combustion engines, caused by variations in injector performance and operating conditions, leads to torque drift, affecting vehicle performance, fuel economy, and emissions, as actual fueling deviates from expected fueling based on fueling commands.
Innovation Solution
The system estimates actual fueling using exhaust oxygen levels and fresh air flow measurements, calculates modification factors to compensate for fuel drift errors, and updates fueling commands in real-time to align actual fueling with expected fueling, thereby correcting fueling drift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fueling commands are based on calibrated tables with established injector parameters, then expected fueling can be determined, but actual fueling deviates due to injector performance variations and operating condition changes
Solution Approach 1:
The system continuously monitors actual fueling through oxygen sensor readings and compares it with expected fueling from calibrated tables. The difference (fuel drift) is fed back to adjust future fueling commands, creating a closed-loop control system that compensates for injector variations and operating condition changes in real-time
Solution Approach 2:
The system dynamically adjusts fueling parameters by calculating modification factors based on measured fuel drift. These modification factors change the original fueling commands from the calibrated tables to compensate for deviations, effectively adapting the fueling strategy to actual engine conditions while maintaining the structure of the original calibration
2Productivity
If fuel drift is not compensated, then system complexity remains low, but vehicle performance, fuel economy, and emissions are negatively impacted
Solution Approach 1:
The system uses feedback from oxygen sensors to continuously monitor fueling accuracy and automatically adjust fueling commands through modification factors, improving fuel economy without requiring complex hardware changes or complete recalibration systems
Solution Approach 2:
The system modifies fueling command parameters by applying calculated correction factors to the original calibrated values. This approach improves fuel economy and performance by compensating for fuel drift while maintaining the simplicity of the original calibration structure and requiring minimal additional system complexity
3Adaptability or versatility
If modification factors are calculated at various commanded fueling values, then fuel drift compensation can be optimized across different operating conditions, but calculation and selection complexity increases
Solution Approach 1:
The system divides the fueling operating range into multiple segments or bins, calculating and storing modification factors for each segment. This segmentation allows the system to handle different operating conditions with appropriate compensation while managing complexity through structured organization of modification factors
Solution Approach 2:
The system adapts fueling commands by selecting and applying appropriate modification factors based on current operating conditions. This parameter adjustment approach enables versatile fuel drift compensation across different fueling levels while maintaining simple selection logic based on predefined operating ranges
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 enhances fuel economy, improves vehicle performance, and reduces emissions by ensuring accurate fueling alignment with fueling commands, thereby maintaining optimal engine operation.
Implementation Method 1
determining an oxygen level in exhaust gases from an engine
Implementation Method 2
determining a fresh air flow to the engine
Implementation Method 3
fuel injectors to be injected into the engine's cylinders in response to a fueling command
Implementation Method 4
combustion in an engine are fuel, air and ignition
Data Source
AI summary
Methods and systems are disclosed for fuel drift estimation and compensation using exhaust oxygen levels and fresh air flow measurements. An actual fueling to the engine cylinders is determined from the exhaust oxygen level and fresh air flow to the internal combustion engine. The actual fueling is compared to an expected fueling based on the fueling command provided to the internal combustion engine. The difference between the actual fueling and expected fueling is fuel drift error attributed to changes or drift in the fuel injection system and is used to correct or compensate future fueling commands for the fuel drift.