Oxygen Sensor Bias Compensation in Engine Fuel Control
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Solution Overview
Problem
Oxygen sensors in internal combustion engines are prone to bias, which can lead to air-fuel ratio imbalances and increased engine emissions.
Innovation Solution
Adjusting the operation of the inner-loop delta fuel controller in response to oxygen sensor bias, including deactivating or constraining its authority, to mitigate the effects of sensor bias and maintain optimal fuel control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If oxygen sensors are used to control fuel supply in engine cylinders, then fuel control precision is improved, but air-fuel ratio imbalance occurs when sensors experience bias
Solution Approach 1:
The system dynamically changes the operational parameters of the delta fuel controller by adjusting its authority range based on oxygen sensor bias detection. When bias is detected, the controller constrains the delta fuel adjustment range, effectively changing the control parameters to prevent air-fuel ratio imbalance while maintaining fuel control precision under normal conditions
Solution Approach 2:
The delta fuel controller transitions from a static control mode to a dynamic control mode where its authority is adjusted in real-time based on oxygen sensor feedback. The controller dynamically adapts its intervention level, increasing authority when no bias is present and reducing authority when bias is detected, thereby resolving the contradiction between precision and stability
2Use of energy by moving object
If the inner-loop delta fuel controller is actively adjusting fuel control, then fuel efficiency is improved, but emissions increase when oxygen sensor bias is present
Solution Approach 1:
The system implements a feedback mechanism where oxygen sensor readings are continuously monitored for bias conditions. When bias is detected, the feedback loop triggers a reduction in delta fuel controller authority, preventing the controller from making aggressive fuel adjustments that would worsen emissions while allowing efficient control under normal sensor operation
Solution Approach 2:
The system takes preliminary anti-action by detecting oxygen sensor bias before it causes significant emissions problems. Upon detecting bias, the controller proactively constrains its authority range, preventing harmful fuel adjustments before they occur, thereby maintaining fuel efficiency when sensors are accurate and preventing emissions when sensors are biased
Data Source
AI summary
Systems and methods for controlling fuel that is supplied to cylinders of an internal combustion engine are described. In one example, oxygen sensors are placed in an exhaust system of an engine such that each oxygen sensor may detect exhaust gas from a pair of engine cylinders. The oxygen sensors may then provide feedback to coupled and decoupled fuel controllers.