Compressor Pressure Ratio Control via Dynamic Power Estimation
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Solution Overview
Problem
Turbocharged internal combustion engines face challenges in accurately controlling compressor power ratio due to unmodeled power losses, leading to overboost and underboost conditions during transient maneuvers, which are difficult to recover with standard model-based boost control.
Innovation Solution
A control system that dynamically computes a first power value based on an estimation model and a second power value based on measured compressor pressure ratio, using a power term estimator module to adjust actuator positions and account for unmodeled power losses through closed-loop operations, thereby reducing overboost and underboost conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If standard model-based boost control is used, then control simplicity is maintained, but accuracy deteriorates due to unmodeled power losses causing overboost and underboost conditions
Solution Approach 1:
The patent implements a feedback mechanism by dynamically estimating the compressor pressure ratio using a power term estimator that continuously compares measured power values with modeled power values. This feedback loop compensates for unmodeled power losses and adjusts the control output to maintain accurate boost pressure control during transient maneuvers.
Solution Approach 2:
The patent introduces an intermediary power term estimator that acts as a mediator between the standard model-based control and the actual compressor behavior. This estimator computes the difference between measured and modeled power, representing unmodeled losses, and uses this information to correct the control output without requiring complete reformulation of the control system.
2Measurement precision
If dynamic power estimation with multiple computation paths is implemented, then control accuracy improves, but computational complexity increases
Solution Approach 1:
The patent segments the power estimation into distinct computational paths: a first power value from the estimation model and a second power value from direct measurement. The power term estimator separately computes these values and their difference, allowing the system to handle complexity in a modular fashion while maintaining accuracy.
Solution Approach 2:
The patent employs dynamic computation where the control system adapts its estimation parameters in real-time based on operating conditions. The power term estimator dynamically adjusts its calculations based on the difference between measured and modeled power, enabling accurate control during transient maneuvers while maintaining computational efficiency through adaptive rather than static computation.
Data Source
AI summary
Embodiments of the present invention described herein include a control system for a vehicle. The control system includes a control module that dynamically computes a first power value (PC) to be generated by a compressor based on an estimation model of the compressor. The control system further includes a power term estimator module that dynamically computes a second power value (PU) based on a measured compressor pressure ratio (βcmeas) of the compressor. The control module further computes an amount of power to be generated by an engine (Ptdes) by adding the first power value and the second power value. The control module further adjusts an actuator position to generate the amount of power to be generated.