Timed Air Inlet Baffle Control Without Position Sensors
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Solution Overview
Problem
Existing air inlet control systems in animal houses are unreliable due to position sensing device failures, leading to accumulated position errors and disruptive ventilation disruptions, which affect animal health and equipment efficiency.
Innovation Solution
A climate control system with a calibrated timed position control method that uses motor current sensing to adjust the air inlet baffle position, accounting for dragging delays and overshoot inertias, and includes a calibration sequence to determine opening and closing velocities and inertias, eliminating the need for position sensing devices and reducing reset requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If position sensing devices are used to control air inlet position, then positioning accuracy is improved, but system reliability deteriorates due to sensor failures and high maintenance requirements
Solution Approach 1:
The patent removes position sensing devices from the air inlet control system entirely. Instead of using sensors to detect baffle position, the system uses a control algorithm that calculates the required actuator activation time based on desired position changes, eliminating the reliability issues associated with sensor failures and maintenance.
Solution Approach 2:
The patent replaces the mechanical/sensor-based position detection system with an electronic control system that uses timing and motor current sensing. The control unit determines actuator operation duration through calibrated timing relationships rather than physical position feedback, substituting a more reliable electronic approach for the problematic mechanical sensor system.
2Device complexity
If timed base operation is used to control air inlet position without feedback, then device complexity is reduced, but positioning accuracy deteriorates due to accumulated position errors
Solution Approach 1:
The patent introduces a calibration-based feedback mechanism. During calibration, the system learns the relationship between actuator activation time and baffle position by monitoring motor current to detect limit switch triggers. This calibrated timing information is then used to accurately control position changes without requiring continuous position feedback during normal operation, maintaining accuracy while avoiding complex feedback systems.
Solution Approach 2:
The patent performs calibration in advance to establish timing parameters before normal operation. The calibration sequence determines the relationship between actuator activation duration and position change, storing this information for use during operational position adjustments. This preliminary action eliminates the need for complex real-time feedback while maintaining positioning accuracy.
3Measurement precision
If air inlet position is reset frequently to correct accumulated errors, then positioning accuracy is improved, but productivity deteriorates due to ventilation disruptions
Solution Approach 1:
The patent enables continuous ventilation operation by eliminating the need for periodic reset interruptions. The calibrated timed control system maintains accurate position control throughout continuous operation without accumulating errors that would require disruptive resets, allowing the ventilation system to run continuously and efficiently.
4Measurement precision
If linear actuators with position sensors are used to control air inlet, then positioning control is improved, but ease of repair deteriorates due to difficult sensor repair and replacement
Solution Approach 1:
The patent removes position sensors from the actuator assembly, eliminating the maintenance burden associated with sensor repair and replacement. The system achieves positioning control through calibrated timing of actuator activation rather than through sensor feedback, greatly simplifying maintenance requirements.
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
The system provides a more reliable and efficient control of airflow, minimizing position errors and reducing the frequency of ventilation disruptions, thereby improving animal health and equipment performance.
Implementation Method 1
A sensor is configured to read the current applied to the motor
Data Source
AI summary
An animal house climate control system uses a method for operating a baffle of an air inlet of an animal house with a motor using timed inlet control. The method includes performing a calibration sequence to calculate opening velocity and opening inertia values and closing velocity and closing inertia values. The method also includes moving the baffle from an initial position to a final position by calculating a calculated power on time for the motor using the opening inertia or closing inertia values. The method can also include calculating a real position error value by comparing the calculated on time for the motor and a measured on time for the motor and using the real position error value to calculate adjusted opening and closing velocity values.