Supercharger Air Bypass Valve Control for Deceleration Surge Inhibition
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Solution Overview
Problem
Internal combustion engines with superchargers experience deceleration surges when transitioning from supercharging to deceleration operations, leading to abnormal noises and vibrations due to increased pressure and reduced airflow, which existing control devices fail to adequately address.
Innovation Solution
A control device that includes a throttle valve opening degree detection unit, an air bypass valve control unit, and a torque reduction control unit, which detects the throttle valve opening degree and maintains the air bypass valve in a closed state during torque reduction control in acceleration shifting to prevent deceleration surges by managing airflow and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air bypass valve is opened to release raised pressure and inhibit deceleration surge, then the deceleration surge is inhibited, but the acceleration performance is deteriorated due to reduced airflow through the compressor
Solution Approach 1:
The air bypass valve control is made dynamic by detecting throttle valve opening degree changes and engine operating conditions (acceleration vs. deceleration). The system dynamically switches between keeping the bypass valve closed during acceleration (for performance) and opening it during deceleration surge conditions (for surge inhibition), optimizing both acceleration performance and deceleration surge prevention
Solution Approach 2:
The control system changes the operational parameters of the air bypass valve based on detected conditions. By monitoring throttle valve opening degree changes and determining whether the engine is in acceleration or deceleration, the system adjusts the bypass valve state to achieve either acceleration performance or deceleration surge inhibition as the primary objective
2Power
If the throttle valve opening degree is reduced for torque reduction control during acceleration shifting, then the torque is reduced, but the deceleration surge may occur due to pressure rise and airflow reduction
Solution Approach 1:
The control system uses feedback from the throttle valve opening degree detection to determine when to open the air bypass valve. By continuously monitoring the throttle valve opening degree and its rate of change, the system provides feedback control that opens the bypass valve only when deceleration surge conditions are detected, even during torque reduction control operations
Solution Approach 2:
The system dynamically adjusts the air bypass valve state based on real-time detection of throttle valve opening degree changes. During torque reduction control, if the throttle valve closing rate exceeds a threshold indicating potential deceleration surge, the bypass valve is opened to prevent surge while allowing the torque reduction control to continue
Data Source
AI summary
A control device for an internal combustion engine includes a throttle valve opening degree detector, an air bypass valve controller, and a torque reduction controller. The throttle valve opening degree detector detects an opening degree of a throttle valve which is provided downstream with respect to a compressor of a supercharger. The air bypass valve controller opens an air bypass valve based on a reduction change in the opening degree of the detected throttle valve. The air bypass valve is configured to open and close a bypass path. The torque reduction controller controls the throttle valve to reduce the opening degree of the throttle valve while an automatic transmission connected to the internal combustion engine is in an acceleration shifting in order to execute a torque reduction control. The air bypass valve controller maintains the air bypass valve in a close state during the torque reduction control.