Vehicle Emissions Management With Real-Time Engine Performance Constraints
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Solution Overview
Problem
Diesel engines face challenges in reducing NOx emissions while maintaining fuel efficiency, as mere manipulation of engine operation may not sufficiently lower NOx to mandated levels, necessitating the use of after-treatment systems.
Innovation Solution
The method involves sensing engine operation data, evaluating a response model to determine engine performance deviation, and setting a performance constraint to maintain engine performance within a control objective, thereby optimizing fuel system and air handling references to balance engine performance and emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If engine operation is manipulated to lower NOx emissions (lowering intake temperature, reducing power output, retarding injector timing, reducing combustion temperature), then NOx emissions are reduced, but fuel efficiency deteriorates
Solution Approach 1:
The patent introduces a supervisory controller as an intermediary layer between the engine control and the environment. This controller dynamically selects operating points along a fuel-emissions tradeoff curve, mediating between the conflicting goals of low NOx emissions and high fuel efficiency by choosing optimal compromise points based on real-time conditions
Solution Approach 2:
The system dynamically adjusts engine operating parameters by selecting different operating points along the tradeoff curve based on real-time conditions. The supervisory controller continuously monitors engine operation and adapts the fuel injection and air handling references to maintain optimal balance between emissions and fuel efficiency throughout the engine lifecycle
2Object-generated harmful factors
If after-treatment systems are implemented to reduce NOx emissions to mandated levels, then emissions compliance is achieved, but system complexity and cost increase
Solution Approach 1:
The supervisory controller performs preliminary actions by proactively managing engine performance deviation throughout the engine lifecycle. It anticipates performance degradation and adjusts operating parameters in advance to maintain optimal emissions performance, reducing the burden on after-treatment systems and extending their effective lifespan
Solution Approach 2:
The system implements continuous feedback by monitoring engine performance deviation from expected baseline performance. The supervisory controller uses this feedback to dynamically adjust fuel injection and air handling references, creating a closed-loop control system that maintains optimal emissions performance without requiring complex additional hardware
3Use of energy by moving object
If engine performance deviation is allowed to accumulate over time, then fuel efficiency may improve temporarily, but engine performance deteriorates
Solution Approach 1:
The supervisory controller continuously monitors engine performance deviation and uses this feedback to make real-time adjustments to fuel injection and air handling references. This closed-loop control prevents performance deviation from accumulating to detrimental levels while maintaining optimal fuel efficiency
Solution Approach 2:
The system takes preliminary action by proactively managing performance deviation before it accumulates to harmful levels. The supervisory controller anticipates performance degradation trends and adjusts operating parameters in advance to maintain consistent engine performance throughout the lifecycle
Data Source
AI summary
Disclosed herein are devices, systems, and methods relating to balancing engine performance and engine emissions of an engine in a vehicle in real time. In an example, a method can include sensing operation data indicative of an engine response during a current engine operation. The current ending operation can include a supervisory control of engine emissions. The method can include evaluating a response model to determine engine performance deviation data corresponding to an expected baseline engine performance and an expected current engine performance at the current engine operation. This evaluation can be performed via controller. This evaluation can be based on the operation data. The method can include generating and setting a performance constraint in response to evaluating the response model. The performance constraint can be set such that the engine performance deviation data is maintained at a controls objective that inhibits deterioration of the engine performance over time.