Power Trowel Speed Control Logic for Rotor Regulation
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Solution Overview
Problem
Existing hydraulically steered riding power trowels lack a means for regulated adjustment of rotational speed of rotor assemblies, limiting their operational efficiency and adaptability.
Innovation Solution
A speed control system that includes a power transfer unit, user input devices for speed control, sensors for measuring blade speed, and a logic controller to adjust engine RPM or pump displacement, implementing logic patterns for follower, cruise control, power management, and matching control signals to maintain desired rotational speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hydraulic steering system is implemented in power trowel, then steering control is improved, but speed regulation capability deteriorates
Solution Approach 1:
The control system is segmented into separate functional modules: hydraulic steering control valves for direction control and an independent electronic speed control system with sensors and logic controllers for speed regulation. This segmentation allows each subsystem to optimize its function without interfering with the other, resolving the contradiction between steering improvement and speed regulation capability.
Solution Approach 2:
The control system integrates multiple functions into a unified platform that handles both hydraulic steering and electronic speed regulation. The system can operate in different modes (manual steering, automated speed control, cruise control) making it universally applicable to various operating conditions while maintaining both steering quality and speed regulation capability.
2Device complexity
If manual speed control is used, then device complexity is reduced, but productivity is limited
Solution Approach 1:
The system incorporates sensors that continuously monitor rotor assembly speed and provide feedback signals to the logic controller. This closed-loop feedback mechanism automatically adjusts engine RPM or pump displacement to maintain desired speed, significantly improving operational efficiency and consistency without requiring complex manual intervention from the operator.
Solution Approach 2:
The speed control system operates autonomously once parameters are set, with the logic controller automatically adjusting speed based on sensor feedback and predefined logic patterns. This self-regulating capability eliminates the need for constant manual adjustment, improving productivity while keeping the added complexity manageable through automated self-service operation.
3Adaptability or versatility
If speed control system is added, then adaptability is improved, but device complexity increases
Solution Approach 1:
The system replaces complex mechanical speed adjustment mechanisms with electronic control. Instead of mechanical variable speed drives, the patent uses electronic sensors and logic controllers that adjust engine RPM or hydraulic pump displacement electronically, reducing mechanical complexity while improving adaptability for different speed requirements.
Solution Approach 2:
The system achieves adaptability by dynamically changing operational parameters (engine RPM, pump displacement) through electronic control rather than mechanical reconfiguration. This allows continuous speed adjustment across a wide range while maintaining a relatively simple overall system architecture, as parameter changes are achieved through control signals rather than physical reconfiguration.
Data Source
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AI summary
An automatic speed control system for a power trowel for regulated adjustment of rotational speed of the trowel rotor assemblies. The disclosure provides for and is configurable to automatically regulate trowel speed and can be adapted to utilize advanced control features like cruise control and power management. The disclosed system incorporates several user and feedback inputs in a number of logic patterns for trowel control.