Electro-Hydraulic Valve Actuation Control Arrangement
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Solution Overview
Problem
The nonlinear dynamics and delay in electro-hydraulic gas exchange valve actuation systems (EHVA) pose challenges in controlling the system accurately, making simple feedback controllers inadequate, and advanced controllers difficult to tune effectively.
Innovation Solution
An integrated control arrangement comprising a feedback controller, an iterative learning controller, and a delay controller, where the iterative learning controller adjusts the reference signal based on actual valve lift data and error tracking, and the delay compensator modifies the reference signal using crank angle data to improve accuracy and reduce tracking errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an advanced controller is used to improve control accuracy, then measurement precision is improved, but device complexity increases and tuning time increases
Solution Approach 1:
The control system is segmented into three distinct functional blocks: a feedback controller for basic closed-loop control, an iterative learning controller for improving accuracy through repeated trials, and a delay compensator for handling system delays. This segmentation allows each component to have specialized functionality, reducing overall complexity while maintaining high accuracy.
Solution Approach 2:
The system employs feedback mechanisms where actual valve lift data is continuously measured and fed back to the controllers. The iterative learning controller uses historical error data from previous trials to adjust future control actions, creating a feedback loop that improves accuracy over time without requiring complex real-time calculations.
2Measurement precision
If an advanced controller is used to improve control accuracy, then measurement precision is improved, but tuning time increases
Solution Approach 1:
The iterative learning controller performs preliminary actions by storing and analyzing error data from previous valve actuation trials before the current control cycle begins. This allows the system to learn from historical performance and automatically adjust control parameters without requiring manual retuning for each new operating condition.
Solution Approach 2:
The control system is designed to self-tune and self-improve automatically. The iterative learning controller continuously refines its performance by using past error data to adjust future control actions, eliminating the need for external manual tuning and reducing the time required to optimize control accuracy for different operating conditions.
3Device complexity
If simple feedback control is used to reduce device complexity, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent merges three control functions into a unified control arrangement that operates as an integrated system. The feedback controller, iterative learning controller, and delay compensator work together synergistically, combining the simplicity of feedback control with the accuracy-improving capabilities of iterative learning and delay compensation to achieve both low complexity and high precision.
Solution Approach 2:
The iterative learning controller acts as an intermediary between the simple feedback controller and the complex requirements for high accuracy. It processes historical error data and generates adjusted reference signals that refine the feedback control actions, enabling simple feedback control to achieve accurate control performance without requiring complex control algorithms.
Data Source
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AI summary
The inventive control arrangement comprises a feedback controller, in an iterative learning controller (1 ), and a delay controller (16). The feedback controller drives EHVA system. The EHVA systems means in this context the system needed to drive one valve or the system driving several valves. For simplicity, it is easier and more understandable to think about the driving of one valve. It is clear that the drive of one valve is expandable to the system driving several valves