Supercharger Control Device for Surge Avoidance
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Solution Overview
Problem
Existing supercharging systems face challenges in controlling superchargers to avoid surging states, particularly at high altitudes, where atmospheric density is low, leading to increased risk of surging and performance deterioration, and current feedback control methods are inefficient in moving the operational point on the compressor map to a desired position.
Innovation Solution
A control apparatus for supercharging systems that includes a compressor map storage part, current position calculation, moving direction calculation, and control parts to control the supercharger based on both the current position and moving direction of the operational point on the compressor map, allowing for efficient movement to a desired position and avoidance of surge regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback control is performed based on current operational point position, then the supercharger can be controlled to avoid surging state, but the operational point may cross the surge line due to control delay and the supercharger may enter a surging state temporarily
Solution Approach 1:
The control device calculates the predicted position of the operational point in advance by using the current moving direction and speed to extrapolate future positions. This predicted position is then used for control decisions before the operational point actually reaches that position, thereby compensating for control delays and preventing surge line crossing.
2Loss of information
If feedback control is performed based on current operational point position, then the supercharger can be controlled, but it is not possible to determine in which direction the operational point is moving on the compressor map
Solution Approach 1:
The control device establishes a feedback mechanism that continuously monitors not only the current position of the operational point but also its moving direction and speed by comparing sequential position data. This feedback information about movement characteristics is then fed back into the control algorithm to predict future positions and adjust control actions accordingly.
3Reliability
If control target is lowered to avoid entering the surging state, then the supercharger can avoid surging, but the performance of the supercharger deteriorates
Solution Approach 1:
By predicting the future position of the operational point using calculated moving direction and speed, the control system can proactively adjust control parameters before the operational point approaches the surge line. This allows the system to maintain higher performance operating points while still preventing surge entry, rather than conservatively lowering the control target.
Data Source
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AI summary
A control apparatus of a supercharging system for supplying an engine with compressed intake air, includes: a supercharger including a compressor configured to compress the intake air to be supplied to the engine; and a controller for controlling a control device affecting operation of the compressor. The controller includes: a compressor map storage part configured to store a compressor map which indicates a relationship of an intake volume flow rate, a pressure ratio, and a compressor rotation speed in the compressor; a current position calculation part configured to calculate a current position of an operational point of the compressor on the compressor map every predetermined period; a moving direction calculation part configured to calculate a moving direction of the operational point on the compressor map on the basis of the current position of the operational point calculated by the current position calculation part; and a control part configured to control the control device on the basis of the current position of the operational point calculated by the current position calculation part and the moving direction of the operational point calculated by the moving direction calculation part.