Predictive Active Casing Treatment for Compressor Surge Prevention
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Solution Overview
Problem
Existing active casing treatment systems for compressors in turbochargers often result in reactionary control methods that lead to efficiency losses and flow pulsations, as they adjust compressor operation only when nearing surge or choke conditions, and struggle to maintain constant pressure flow during actuation.
Innovation Solution
A method involving a variable geometry compressor with an active casing treatment, where the compressor casing sleeve is actuated based on compressor pressure ratio and mass flow, adjusting EGR and boost actuators to maintain constant pressure flow and extend the operating range by predicting driver behavior and road conditions, thereby optimizing compressor operation and reducing actuation frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an active casing treatment is adjusted based on current engine operating conditions, then compressor surge and choke conditions can be prevented, but efficiency losses and flow pulsations occur due to reactionary control
Solution Approach 1:
The controller predicts future engine operating conditions based on current conditions and driver behavior patterns, then proactively adjusts the active casing treatment position before surge or choke conditions occur. This predictive approach prevents the need for reactionary adjustments that cause efficiency losses and flow pulsations.
Solution Approach 2:
The system uses feedback from current compressor operating conditions (pressure ratio, mass flow) and predicted future conditions to continuously optimize the active casing treatment position. This closed-loop control ensures the compressor operates efficiently while preventing surge and choke conditions.
2Adaptability or versatility
If the casing sleeve is frequently actuated to respond to changing conditions, then compressor operation can be optimized, but flow pulsations and efficiency degradation increase
Solution Approach 1:
By predicting future operating conditions, the system can make smoother, more deliberate casing sleeve adjustments rather than frequent reactive changes. This reduces flow pulsations while maintaining optimal compressor operation across varying conditions.
Solution Approach 2:
The active casing treatment position is dynamically adjusted based on predicted operating conditions, allowing the system to adapt to changing engine loads and driver behavior while maintaining flow stability through proactive rather than reactive control.
3Adaptability or versatility
If the active casing treatment is used to extend compressor operating range, then surge and choke boundaries are pushed outward, but actuation frequency increases leading to performance degradation
Solution Approach 1:
The predictive control system anticipates when the compressor will approach surge or choke boundaries and adjusts the active casing treatment in advance, extending the effective operating range without requiring frequent actuations that would degrade performance.
Data Source
AI summary
Methods and systems are provided for adjusting an active casing treatment of a compressor responsive to a predicted engine condition. In one arrangement, a controller may actuate a sleeve of a variable geometry compressor casing to a position selected based on each of a compressor pressure ratio and a mass flow through the compressor, as well as driver behavior and predicted road conditions; and adjust each of an EGR actuator and a boost actuator based on the selected position to maintain the compressor pressure ratio during the actuating.