Engine Emissions Control via Charge Density and NOx Sensor Integration
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Solution Overview
Problem
Existing engine emissions control systems, such as those described in U.S. Pat. No. 6,370,473, are unable to effectively address undesirable NOx levels due to variations in charge density, as they do not measure or control this parameter, leading to incomplete rectification of NOx issues.
Innovation Solution
An engine emissions control system that includes a NOx sensor and a charge density sensing system, with a controller that adjusts charge density based on NOx measurements and charge density data to control combustion mixture parameters, thereby addressing the root cause of NOx levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a NOx sensor is used to measure NOx levels and control air-fuel ratio based on these measurements, then NOx control capability is improved, but the system cannot address NOx issues caused by variations in operating parameters other than air-fuel ratio (such as charge density)
Solution Approach 1:
The controller is enhanced to perform multiple control functions by integrating both AFR control and charge density control capabilities. The controller now processes NOx measurements and independently adjusts both air-fuel ratio and charge density to address NOx emissions from multiple sources, making the system versatile in handling different NOx generation mechanisms
2Device complexity
If only air-fuel ratio control is implemented based on NOx measurements, then system simplicity is maintained, but the ability to correct NOx issues stemming from charge density variations is lost
Solution Approach 1:
The control system dynamically adjusts multiple parameters (air-fuel ratio and charge density) based on real-time NOx measurements. The controller continuously monitors NOx levels and independently modifies both AFR and charge density settings to adaptively address the root causes of emissions, enhancing system reliability without excessive complexity
Data Source
AI summary
An engine emissions control system is provided. The system may include an exhaust producing engine and an exhaust system through which the exhaust produced by the engine may flow. The system may also include a NOx sensor configured to take a NOx measurement of the amount of NOx in the exhaust produced by the engine. The system may further include a charge density sensing system configured to measure the charge density of a combustion mixture of the engine. In addition, the system may include a controller configured to receive information related to the measurement of the amount of NOx. The controller may be further configured to control a charge density of the combustion mixture with which the engine operates based on the NOx measurement and the charge density measured by the charge density sensing system.