Oxygen Sensor Control Module Normalizes Air-Fuel Ratios
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Solution Overview
Problem
Current engine exhaust systems are limited by their dependence on specific sensor types and models, which restricts the ability to measure a normalized air-to-fuel ratio and assess the effectiveness of components like catalytic converters, hindering flexibility and functionality.
Innovation Solution
A system comprising an engine control module, oxygen sensor control module, and multiple wide-band oxygen sensors positioned upstream and downstream from a catalytic converter, capable of providing a standardized oxygen balance metric regardless of sensor type or model, allowing for the normalization of air-to-fuel ratios and evaluation of catalytic converter effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a specific sensor type or model is used in the engine control module, then the control module can accurately calculate the air-to-fuel ratio, but the system lacks flexibility and cannot operate with different sensor types or models
Solution Approach 1:
An oxygen sensor control module is introduced as an intermediary component between the wide-band oxygen sensor and the engine control module. This control module receives the pumping current from various sensor types, processes and normalizes the signal, and provides a standardized oxygen balance metric to the engine control module. This intermediary layer enables compatibility with different sensor types without requiring reconfiguration of the engine control module.
Solution Approach 2:
The system is divided into separate functional modules: the oxygen sensor control module handles sensor-specific processing and normalization, while the engine control module receives standardized data. This segmentation allows each module to be optimized independently and enables easy replacement of sensors without affecting the engine control module.
2Adaptability or versatility
If only a single oxygen sensor is provided in the system, then the engine control module can function with simplified hardware, but the system cannot assess the effectiveness of components like catalytic converters
Solution Approach 1:
The oxygen sensor control module is designed to handle multiple sensors of different types simultaneously, providing a universal interface that supports both single-sensor and multi-sensor configurations. This enables the system to perform multiple functions including air-to-fuel ratio calculation and catalytic converter effectiveness assessment without requiring separate processing paths.
3Adaptability or versatility
If different sensor types or models are substituted in the system, then potentially less expensive or more effective sensors can be used, but the engine control module must be reconfigured which creates dependency and increases complexity
Solution Approach 1:
The oxygen sensor control module serves as a mediator that absorbs the complexity of sensor-specific variations. It contains the calibration data and processing logic for different sensor types, allowing sensors to be interchanged without requiring any reconfiguration of the engine control module. The intermediary handles all adapter logic internally.
Solution Approach 2:
The oxygen sensor control module is pre-configured with calibration data and processing parameters for multiple sensor types. This preliminary preparation allows for immediate sensor interchange without system reconfiguration, as the control module already contains the necessary adaptation logic for various sensor models.
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
Enables the engine control module to operate with various sensors, providing a standardized oxygen balance metric that normalizes air-to-fuel ratios and facilitates the assessment of catalytic converter performance, enhancing engine performance and maintenance efficiency.
Implementation Method 1
The oxygen sensor control module establishes an oxygen pumping current for the wide-band oxygen sensor according to the oxygen content in the exhaust.
Data Source
AI summary
An apparatus, system, and method are disclosed for measuring a normalized air-to-fuel ratio. A normalized air-to-fuel ratio is measured by providing an engine control module, providing a first wide-band oxygen sensor in fluid communication with an exhaust stream, adjusting the oxygen pumping current to achieve a stoichiometric balance, detecting the oxygen pumping current, converting the oxygen pumping current to an oxygen balance metric, and communicating the oxygen balance metric to the engine control module. In certain embodiments, the oxygen balance metric may be a volumetric oxygen percentage. In some embodiments, the present invention includes a first and second wide-band oxygen sensor upstream and downstream from an exhaust treatment module.