HVAC Motor Control Unit with Digital Output Limit Profiles
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Solution Overview
Problem
HVACR systems with variable speed motors and other signal-controlled devices face challenges in optimizing performance under unique operating conditions, requiring specialized features that cannot be adjusted in the field, such as output limits, delayed shutdown, and multiple motor feedback monitoring, which existing control units do not adequately address.
Innovation Solution
A digital adjustment profile (DAP) is implemented in an automation control unit (ACU) to set and configure features like Start Up Counter, RPM Pulse Selection, Manual Adjuster Feedback, Output Limits, Output Ramping, and Multiple Motor RPM Averaging, allowing for customized settings that do not require field adjustments, enabling optimized performance and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a control unit is designed with fixed features for unique operating conditions, then performance optimization is achieved, but adaptability to different field requirements deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring the control unit with a digital adjustment profile that includes startup counter, output limits, delayed shutdown, and multiple motor feedback monitoring features during manufacturing. These optimizations are built-in before deployment, ensuring reliable performance for unique operating conditions without requiring field adjustments.
2Adaptability or versatility
If manual adjustment mechanisms are provided for field customization, then adaptability improves, but system complexity and potential for incorrect adjustment increase
Solution Approach 1:
The patent extracts the adjustment functionality from physical manual mechanisms and relocates it to a digital profile stored in memory. The digital adjustment profile contains all customization parameters (startup counter, output limits, delayed shutdown settings) that can be programmatically configured without complex physical adjustment mechanisms, reducing hardware complexity while maintaining adaptability.
3Adaptability or versatility
If multiple specialized features are integrated into the control unit, then functionality and performance are enhanced, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by designing a control unit with a universal digital adjustment profile that can accommodate multiple specialized features (startup counter, output limits, delayed shutdown, multiple motor feedback) within a single integrated structure. The microcontroller and memory work together to provide diverse functionalities without requiring separate dedicated circuits for each feature.
Solution Approach 2:
The patent applies parameter changes by storing all feature configurations as adjustable parameters in the digital adjustment profile in memory. Instead of hardwiring different configurations, the system changes operational parameters programmatically, allowing the same hardware structure to adapt to different operating conditions by modifying stored parameter values rather than physical configuration.
4Manufacturing precision
If field adjustments are minimized, then manufacturing precision and consistency improve, but flexibility for unique site requirements deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring the digital adjustment profile with manufacturer-recommended settings during production, ensuring consistent and precise configurations across all units. The profile includes pre-set parameters for startup counter, output limits, and delayed shutdown that are optimized by the manufacturer before deployment.
Solution Approach 2:
The patent implements dynamics by making the pre-configured digital adjustment profile programmatically modifiable. While the baseline configuration ensures manufacturing precision and consistency, the profile can be dynamically adjusted through code modifications to accommodate site-specific requirements, combining the benefits of standardized manufacturing with adaptive field customization.
Data Source
AI summary
A method and apparatus for an automation control unit (ACU) for converting an automation control signal to a pulse width modulation (PWM) signal to control the output of a HVACR device such as a variable speed (VS) motor in an HVAC system is disclosed. The invention limits the motor output between a high and low limit, keeping the connected HVACR device operating within a safe range for the HVAC equipment. The invention simplifies commissioning of HVACR devices, constrains the equipment to operate within its designed operating range, optimizes energy efficiency of the HVAC equipment and minimizes disturbance in the controlled environment.