Predictive EGR Control for Heavy-Load NOx and Torque Balance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Commercial vehicles often operate under heavy load conditions, which challenges the effective use of Exhaust Gas Recirculation (EGR) systems for energy conservation and emission reduction, as existing EGR control methods struggle to balance torque output and NOx emissions in such conditions.
Innovation Solution
A predictive EGR control method that utilizes electronic horizon data to anticipate upcoming slowdown sections and adjust the EGR rate accordingly, by calculating the necessary engine output torque reductions or increases to optimize EGR usage and minimize NOx emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the EGR valve is closed when the diesel engine runs at high load to maintain power output, then the engine power is maintained, but the harmful gas NOx emissions increase
Solution Approach 1:
The system uses electronic horizon data to predict upcoming slowdown sections and pre-adjusts the EGR rate before the vehicle enters these sections. By opening the EGR valve in advance during predicted slowdown periods, the system reduces NOx emissions proactively while maintaining power output during non-slowdown periods, thus resolving the contradiction between power maintenance and emission reduction.
2Object-generated harmful factors
If a large EGR rate is used when the diesel engine runs at low load to reduce NOx emissions, then the harmful gas NOx emissions decrease, but the engine power output is reduced
Solution Approach 1:
The system dynamically adjusts the EGR rate based on real-time driving conditions and predicted road profiles. Instead of maintaining a static high EGR rate, the system varies the EGR rate according to whether the vehicle is in a slowdown section or not, optimizing the balance between emission reduction and power output for each specific driving condition.
3Object-generated harmful factors
If the EGR valve is kept open to maximize emission reduction, then the NOx emissions decrease significantly, but the engine torque output is reduced
Solution Approach 1:
The system applies periodic modulation to the EGR rate based on the predicted road profile. The EGR valve is opened during predicted slowdown sections and closed or partially closed during normal driving sections, creating a periodic pattern of high and low EGR rates that achieves emission reduction while maintaining overall torque output requirements.
Data Source
AI summary
The disclosure relates to a predictive EGR control method and terminal device, and a storage medium. The method includes: calculating, if there is a slowdown section ahead of a vehicle, an engine output torque to be reduced for travelling from a current position to a start position of the slowdown section and/or an engine output torque to be increased for travelling from the start position of the slowdown section to an end position of the slowdown section, and thereby adjusting an EGR rate according to the engine output torque to be reduced or increased. Before the vehicle running at a high load enters the slowdown section, an EGR valve can be opened in advance to increase the EGR rate, thereby reducing harmful gas emissions.