Evaporative Emissions Valve Control for Engine Performance
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Solution Overview
Problem
Existing methods for controlling evaporative emissions in vehicles do not optimally balance carbon emission reduction with engine performance across various conditions.
Innovation Solution
An evaporative emissions system with sensors and processors that control valves between the fuel tank and carbon canister, determining appropriate purging conditions based on transmission state, fuel tank pressure, and diagnostics to manage carbon emissions effectively while maintaining engine performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If aggressive purging is used to reduce carbon emissions, then emission reduction is improved, but engine performance deteriorates due to potential stalling
Solution Approach 1:
The system dynamically adjusts the purging strategy by switching between aggressive and conservative modes based on real-time sensor data including engine RPM, vehicle speed, and transmission state. The control module modulates the purge valve opening percentage and duration to optimize the balance between emission reduction and engine performance maintenance.
Solution Approach 2:
The system uses feedback from multiple sensors (oxygen sensors, manifold pressure sensors, engine RPM sensors) to continuously monitor engine performance and adjust purging rates accordingly. When engine performance degradation is detected, the system reduces purging intensity; when performance is stable, the system increases purging to reduce emissions.
2Reliability
If conservative purging is used to maintain engine performance, then engine performance is maintained, but carbon emission reduction becomes less effective
Solution Approach 1:
The system implements periodic purging cycles alternating between aggressive and conservative modes. During periods when engine performance allows, aggressive purging is applied to maximize emission reduction. When performance constraints are detected, the system switches to conservative purging, creating a periodic pattern that achieves both goals over time.
3Measurement precision
If multiple valves and sensors are added to control purging, then emission control precision is improved, but device complexity increases
Solution Approach 1:
The control module serves multiple functions: it monitors engine performance parameters, determines purging strategy (aggressive or conservative), controls purge valve timing and duration, and adjusts purging rates in real-time. This multi-functional approach consolidates control logic into a single module, reducing overall system complexity despite multiple sensors and valves being present.
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
The system selectively controls carbon emissions by adjusting purging rates, ensuring efficient emission reduction while preventing engine stalling, thus optimizing both emission control and engine performance.
Implementation Method 1
a carbon canister configured to capture carbon emissions from the fuel tank
Data Source
AI summary
Methods and systems are provided for an evaporative emissions system of a vehicle. In an exemplary embodiment, the evaporative emissions system includes an engine; a fuel tank configured to provide fuel for the engine; a plurality of sensors configured to generate sensor data for the evaporative emissions system; a carbon canister configured to capture carbon emissions from the fuel tank; a first valve disposed between the carbon canister and the engine; a second valve disposed between the fuel tank and the carbon canister; and one or more processors that are configured to at least facilitate selectively controlling opening and closing of the first and second valves, to thereby control carbon emissions from the carbon canister and maintain performance of the engine, using the sensor data.