Wastegate Valve Control for Reference Position Shift Compensation
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Solution Overview
Problem
Existing wastegate valve control systems for internal combustion engines face challenges in accurately controlling the wastegate valve to a desired open/closed state due to shifts in the reference position, leading to potential overcurrent issues and increased costs from complex models and processing requirements.
Innovation Solution
A wastegate valve control device and method that includes a control section to adjust the wastegate valve opening based on detected pressure differences, using a throttle upstream-pressure determining section to assess control state and a target opening calculating section to generate corrected target openings, ensuring the wastegate valve is controlled to the desired state by adding or subtracting a prescribed opening until the appropriate control state is achieved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the WGV is motorized to drive the WGV as needed without depending on the pressure in the intake path, then the WGV can be operated flexibly to limit supercharging, but there is generated an error between a detected value by a WGV opening sensor and a true WGV opening due to shift of reference position
Solution Approach 1:
The control section continuously monitors the actual throttle upstream pressure and compares it with the target value. Based on this feedback, the control section adjusts the WGV opening to minimize the pressure difference, thereby compensating for reference position shifts and maintaining accurate control despite sensor drift over time.
Solution Approach 2:
The patent replaces the conventional pressure-dependent mechanical actuation system with an electronically controlled motorized actuator. This substitution allows for precise electronic control of the WGV opening based on pressure feedback, eliminating the limitations of mechanical systems while enabling continuous adjustment to compensate for sensor drift.
2Manufacturing precision
If the WGV further operates from the fully-closed state to a closing side when throttle upstream pressure does not reach control target value, then pressure control can be improved, but there is a risk in that a driving current of the WGA becomes an overcurrent
Solution Approach 1:
The control section dynamically adjusts the WGV opening based on real-time pressure feedback rather than using fixed position commands. This dynamic control allows the system to achieve precise pressure control while adapting the actuator's movement to avoid excessive currents, particularly when operating near the fully-closed position where mechanical constraints exist.
Solution Approach 2:
The system uses continuous feedback from the pressure sensor to modulate the WGV opening in small, controlled increments. This feedback mechanism prevents the actuator from attempting to force the valve beyond its mechanical limits, thereby avoiding overcurrent conditions while still achieving the desired pressure control precision.
3Measurement precision
If complex models and processing are used to correct WGV opening shifts, then control accuracy can be improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent employs a straightforward feedback control mechanism that continuously compares actual pressure with target pressure and adjusts WGV opening accordingly. This simple yet effective approach achieves accurate pressure control without requiring complex predictive models or extensive computational processing, thereby maintaining system simplicity while ensuring control precision.
Solution Approach 2:
The control system automatically compensates for reference position shifts and sensor drift through its inherent feedback mechanism, without requiring external calibration procedures or complex correction algorithms. The system self-adjusts based on real-time pressure measurements, eliminating the need for additional complexity while maintaining high control accuracy.
Data Source
AI summary
Provided are a wastegate valve control device for an internal combustion engine and a wastegate valve control method for an internal combustion engine, which are capable of controlling a wastegate valve (WGV) to a desired open/closed state at low cost even when a reference position of the WGV is shifted from a full-closure position of the WGV. When a target WGV opening (control target value) is equal to or smaller than a threshold opening, a given opening is added to or subtracted from the target WGV opening while the WGV is controlled to perform an opening/closing operation based on the target WGV opening. By monitoring a change in throttle upstream pressure or driving current of a WGV actuator, an optimal target WGV opening corresponding to the shift of the reference position with respect to the full-closure position of the WGV is determined.