Sequential Turbocharger Control for Transient Engine Events
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Solution Overview
Problem
Existing multi-turbocharger control systems face challenges in optimizing turbocharger operation during transient conditions, leading to suboptimal performance and increased smoke emissions, as they fail to effectively manage turbocharger activation and deactivation in response to rapid changes in engine speed and load.
Innovation Solution
A method for controlling a plurality of turbochargers using a turbo speed sensor, turbine valve, compressor valve, and actuators, which involves generating transient flags and mass flow thresholds to dynamically adjust the position of the turbine and compressor valves based on engine speed and airflow, allowing for sequential turbocharger control to optimize performance during transient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multi-turbocharger control systems activate/deactivate turbochargers during transient conditions, then engine power and air density can be increased, but performance is suboptimal and smoke emissions increase due to ineffective management of turbocharger activation and deactivation
Solution Approach 1:
The control system dynamically adjusts turbocharger activation and deactivation based on real-time transient conditions, using variable thresholds for turbocharger addition and removal that adapt to the rate of change in engine load and speed, optimizing performance while minimizing smoke emissions during transitions
Solution Approach 2:
The system continuously monitors engine operating conditions and uses feedback signals to determine when to activate or deactivate turbochargers, comparing actual transient conditions against calibrated thresholds to make informed decisions that balance power output with emission control
2Productivity
If existing control systems manage turbocharger operation during transient conditions, then some engine demand can be met, but performance optimization and smoke emission reduction are insufficient due to inability to respond effectively to rapid changes in engine speed and load
Solution Approach 1:
The control system calibrates turbocharger addition and removal thresholds in advance based on expected transient conditions, preparing the system to respond immediately when transient events occur, thereby optimizing performance and minimizing emissions during rapid load changes
Solution Approach 2:
The system changes operational parameters such as turbocharger activation thresholds and response timing based on the detected transient condition magnitude and rate of change, allowing optimized control that adapts to different transient scenarios to improve performance while reducing smoke emissions
Data Source
AI summary
A method for controlling and engine system with a plurality of turbochargers. At least one of the plurality of turbochargers has a turbine valve, a compressor valve, and actuators operable to change the position of the turbine valve. The method comprises controlling the actuator based on the presence of a transient event or a steady state event. During a transient event an engine control module can control the actuators to change the turbine valve to opened and closed positions and the turbine valve to a closed position based on the comparison between a corrected mass flow per turbocharger to a mass flow threshold.