Electromagnetic Valve Control with Environmental Coefficient Learning
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Solution Overview
Problem
The existing electromagnetic valve control systems for hydrostatic continuously variable transmission devices in work vehicles face challenges in accurately controlling the swash plate angle immediately after engine startup due to variations in environmental conditions, leading to suboptimal PI control and inappropriate valve operation.
Innovation Solution
The system includes a control signal generator using feedback control with an environmental coefficient, a coefficient determiner that learns and updates the coefficient during a learning period, and an operation limiter to ensure accurate control signal generation and valve operation by determining the environmental coefficient corresponding to the current state, even after engine restart.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PI control is used to control electromagnetic valves in the hydrostatic continuously variable transmission device, then the swash plate angle can be controlled, but control accuracy deteriorates immediately after engine startup due to environmental condition variations
Solution Approach 1:
The control device performs preliminary learning of the environmental coefficient during a learning period immediately after engine startup, before normal operation begins. This preliminary action ensures that the control system adapts to current environmental conditions (temperature, pressure, etc.) before actual transmission control is required, thereby maintaining control accuracy from the start of operation.
Solution Approach 2:
The system dynamically adjusts the environmental coefficient based on detected environmental conditions during the learning period. By changing this parameter according to actual temperature, pressure, and other environmental factors, the control system compensates for environmental variations and maintains accurate control of the electromagnetic valves and swash plate angle.
2Measurement precision
If the environmental coefficient is learned during a learning period after engine startup, then control accuracy is improved, but the learning period requires time during which operations are limited
Solution Approach 1:
The learning period is set to a predetermined, relatively short duration rather than extending throughout entire operation. This partial learning approach is sufficient to capture environmental conditions without requiring an excessively long time. The system performs the necessary learning quickly and then transitions to normal operation with the learned coefficient.
Solution Approach 2:
The control device automatically performs the learning process and environmental coefficient determination without requiring manual intervention or operator attention. The system self-adjusts during the learning period, and the operation limiter automatically manages operational constraints, eliminating the need for external control during this phase.
3Measurement precision
If the operation limiter restricts electromagnetic valve and gear transmission operations during the learning period, then control signal accuracy is improved, but operational versatility is reduced
Solution Approach 1:
The operation limiter preemptively restricts certain operations during the learning period to prevent conflicts between learning activities and normal operations. By anticipating potential interference, the system proactively limits operations that could affect learning accuracy, ensuring that the environmental coefficient is determined under stable, controlled conditions.
Solution Approach 2:
The operation limiter dynamically manages operational restrictions based on the learning period status. During learning, certain operations are limited to ensure accuracy, but the system transitions smoothly to full operational capability once learning is complete. This dynamic adjustment balances the need for accurate coefficient determination with the need for operational flexibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables accurate control of electromagnetic valves by generating a control signal that accounts for environmental changes, ensuring precise operation of the hydrostatic continuously variable transmission device from the initial engine start, thereby improving the vehicle's performance and reliability.
Implementation Method 1
electromagnetic valve control device to control a hydrostatic continuously variable transmission device with use of electromagnetic valves
Data Source
AI summary
An electromagnetic valve control device includes a control signal generator to, through feedback control involving an environmental coefficient, generate a control signal intended for at least one electromagnetic valve and corresponding to a target electric current value, a coefficient determiner to determine an environmental coefficient during a learning period from a start of a driver operation to an end of a predetermined time, and an operation limiter to limit respective operations of the at least one electromagnetic valve and a gear transmission during the learning period.