Turbocharger Control Device Deterioration Detection via Efficiency Maps
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Solution Overview
Problem
Existing methods for detecting turbocharger deterioration, such as those described in Patent Document 1, are limited as they rely on rotation-speed changes associated with waste-gate valve operation and cannot accurately detect deterioration in turbochargers without a waste-gate valve or in various operation states, leading to insufficient detection and applicability issues.
Innovation Solution
A control device for turbochargers that includes a storage unit with a map defining characteristic parameters and efficiency relationships, a detection unit to measure these parameters, a calculation unit to determine efficiency, and an informing unit to request maintenance based on comparisons between detected and reference efficiencies, allowing for accurate deterioration detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If determination is performed based on rotation-speed change accompanying waste-gate valve operation, then deterioration detection is possible for turbochargers with waste-gate valves, but determination cannot be performed while the waste-gate valve is not in operation and cannot be applied to turbochargers without waste-gate valves
Solution Approach 1:
The patent uses multiple characteristic parameters (rotation speed, intake air flow rate, exhaust gas flow rate) that can be measured across all turbocharger types and operation states, making the deterioration detection method universally applicable whether the turbocharger has a waste-gate valve or uses variable-vane control, and regardless of the current operation state
Solution Approach 2:
The patent transitions from using a single parameter (rotation-speed change during waste-gate valve operation) to using multiple characteristic parameters (rotation speed, intake air flow rate, exhaust gas flow rate) to determine deterioration, enabling detection across all operation states and turbocharger types
2Device complexity
If determination is based on a specific part of the turbocharger (rotation-speed change), then the method is simple to implement, but deterioration of the turbocharger may not be necessarily reflected and detection is insufficient
Solution Approach 1:
The patent divides the deterioration detection into multiple independent characteristic parameters (rotation speed, intake air flow rate, exhaust gas flow rate) that can be measured and analyzed separately, then combines them to achieve comprehensive and accurate deterioration detection while maintaining implementation simplicity
Solution Approach 2:
The patent establishes a reference map containing characteristic parameters and efficiency data from a non-deteriorated turbocharger, then continuously compares actual measured parameters against this reference to provide feedback on deterioration status, enabling accurate and ongoing detection
Data Source
AI summary
The present invention relates to a control device (26) for a turbocharger (17) for supplying compressed intake air to an internal combustion engine (1). The control device includes: a storage part (27) configured to pre-store a map (33); a detection part (28) configured to a characteristic parameter; a calculation part (29) configured to obtain an efficiency η of the turbocharger on the basis of the detected characteristic parameter; a determination part (30) configured to determine presence of deterioration of the turbocharger by comparing the detected characteristic parameter and the obtained efficiency η with the map (33); and an informing part (31) configured to inform a user of a maintenance request.