Valve Control Device Soft-Landing Initiation Position
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Solution Overview
Problem
The seating speed of the valve body in a wastegate valve affects wear and damage, and existing methods that adjust the valve's fully closed state based on supercharger temperature can prolong the seating time, compromising responsiveness and longevity.
Innovation Solution
A valve control device that learns the seated position of the valve body using startup and degree-of-opening signals, sets a soft-landing initiation position, and decelerates the valve body to a predetermined seating speed, optimizing the seating process and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the full-close-time speed is set to a low speed as a whole, then the impact force on the valve body and valve seat is reduced, but the time it takes for the valve body to be seated on the valve seat is prolonged
Solution Approach 1:
The full-close-time speed is divided into two distinct phases: initial speed (relatively high) and late speed (relatively low). The control target value is segmented to specify different speeds for different stages of the valve body movement, allowing the system to achieve both fast response and reduced impact force.
Solution Approach 2:
The valve control device dynamically adjusts the speed profile during the valve body movement. By making the speed a variable that changes throughout the seating process (high initially, then low near the end), the system optimizes both response time and impact reduction rather than using a fixed speed.
2Reliability
If the switching point between initial speed and late speed is set for a valve with temperature-corrected fully closed position, then the late speed period is prolonged, but the time it takes for the valve body to be seated on the valve seat is increased
Solution Approach 1:
The control target value is determined based on feedback from the degree-of-opening signal that indicates the actual position of the valve body. This feedback mechanism allows the switching point between speed phases to be optimally positioned, ensuring that the late speed phase begins at the right moment to reduce impact without unnecessarily prolonging the overall seating time.
3Adaptability or versatility
If the fully closed position of the valve body is corrected depending on the temperature of the supercharger, then the degree of opening is properly adjusted regardless of temperature, but the soft-landing initiation position may be delayed
Solution Approach 1:
The control target value is predetermined based on the learned seated position and optimized soft-landing initiation position. This preliminary setup of control parameters ensures that when temperature correction is applied to determine the fully closed position, the valve body is already guided along an optimal trajectory that minimizes seating time while maintaining proper impact reduction.
Data Source
AI summary
A valve control device controls an actuator for operating a valve based on a signal indicating a degree of opening of the valve and a signal indicating starting of an engine for which the valve. The valve control device includes a fully closed learning processing unit configured to learn a seated position at which a valve body is seated on a valve seat whenever the engine is started on the basis of the startup signal and the degree-of-opening signal, and a target value setting unit configured to set a soft-landing initiation position when the valve body is seated based on the seated position and set a target value with the valve body is decelerated from the soft-landing initiation position, and the valve body is seated at a predetermined seating speed. A control driving unit is configured to generate a drive signal based on the target value and the degree-of-opening signal.