Turbo Controller for Boost Pressure Surging Prevention
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Solution Overview
Problem
The increasing complexity of engine controller logics and hardware complicates the prevention of surging in supercharging systems, particularly due to communication delays that affect rapid control of boost pressure.
Innovation Solution
A control device for the supercharging system featuring a turbo controller that operates independently from the engine controller, allowing for quick control of boost pressure by computing and outputting turbo control command values directly to the boost-pressure control unit, thereby avoiding communication delays and preventing surging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If engine controller is used to control boost pressure, then comprehensive engine management is achieved, but communication delay occurs affecting rapid response
Solution Approach 1:
The control system is segmented into two independent controllers: the engine controller for overall engine management and the turbo controller dedicated to supercharger control. This segmentation allows the turbo controller to operate independently with direct access to sensor signals, eliminating communication delays while the engine controller maintains comprehensive engine management functions.
Solution Approach 2:
A dedicated turbo controller is introduced as an intermediary device between the sensor signals and the boost-pressure control unit. This intermediary handles the time-critical boost pressure control tasks, preventing surging through rapid response without burdening the main engine controller with communication overhead.
2Speed
If separate turbo controller is introduced, then communication delay is avoided, but device complexity increases
Solution Approach 1:
The control functions are segmented by introducing a dedicated turbo controller that handles only supercharger-related control tasks. This segmentation enables high-speed boost pressure control independent of the engine controller, while the increased device complexity is justified by the significant improvement in control speed and surging prevention capability.
Data Source
AI summary
A control device (10) for a supercharging system for supplying compressed intake air to an engine (2) includes: an engine controller (10A) including an engine-signal input part (10A1) and an engine control part (10B1) configured to control an operational state of the engine; and a turbo controller (10B) including a turbo-signal input part (10B1) and a turbo-control part (10B2) including a turbo-control-command-value computing part (10B2a) configured to compute a turbo control command value corresponding to a target boost pressure of the supercharger (3). The boost-pressure control unit is controlled so that a boost pressure of the supercharger reaches the target boost pressure through output of the turbo control command value computed by the turbo-control-command-value computing part to the boost-pressure control unit.