Wastegate Valve Control Gain Switching for Exhaust Pressure
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Solution Overview
Problem
The followability of the real degree of opening of the wastegate valve is affected by exhaust gas pressure, which existing technologies fail to adequately address.
Innovation Solution
A valve control device that performs feedback control of the wastegate valve using sensor signals and includes a gain setting unit to set different control gains based on the valve's open or closed state, with higher gains during transitional phases and lower gains during steady phases, to maintain control followability under exhaust gas pressure influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single control gain is used for feedback control of the wastegate valve, then the control system is simple, but the followability of the real degree of opening for the target degree of opening is degraded under exhaust gas pressure influence
Solution Approach 1:
The control gain is made dynamic by switching between a first control gain and a second control gain based on the operational state of the wastegate valve. When the valve transitions from closed to opened state, the system switches from the first control gain to the second control gain, allowing the control parameters to adapt to changing exhaust gas pressure conditions and maintain optimal followability throughout the valve's operation range.
2Speed
If the control gain is increased to improve followability during valve transition, then the response speed improves, but the system becomes more sensitive to exhaust gas pressure fluctuations
Solution Approach 1:
The control gain is segmented into at least two distinct values: a first control gain for when the wastegate valve is closed and a second control gain for when it is opened. This segmentation allows the system to optimize response speed during transitions while maintaining stability during steady-state operation, as each gain value is tailored to the specific operational phase and its associated exhaust gas pressure characteristics.
Data Source
AI summary
A valve control device performs feedback control of a drive mechanism for a wastegate valve provided for a supercharger of an engine on the basis of a sensor signal indicating a real degree of opening of the wastegate valve and a target degree of opening of the wastegate valve, and includes a gain setting unit configured to set different control gains when the wastegate valve is closed and when the wastegate valve is opened.