Hydraulic Motor Speed Calibration for Overspeed-Limiting Control
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Solution Overview
Problem
Hydraulic systems in work vehicles often experience overspeed and underspeed conditions due to motor and pump inefficiencies, leading to wear and inappropriate operational characteristics, with existing systems lacking effective speed-limiting calibration controls.
Innovation Solution
A hydraulic control system with a processor that triggers a calibration protocol based on input conditions, generating a calibration factor to adjust pump and motor commands, thereby limiting motor speed and ground speed, and preventing overspeed and underspeed conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the hydraulic pump increases pump command to improve productivity, then the hydraulic motor speed increases, but overspeed conditions occur causing wear and reliability issues
Solution Approach 1:
The control system continuously monitors the hydraulic motor speed and compares it to a maximum speed threshold. When overspeed conditions are detected, the system automatically adjusts the pump command to reduce motor speed, creating a closed-loop feedback control that prevents component wear while maintaining productivity.
Solution Approach 2:
The system dynamically adjusts the pump command based on real-time motor speed conditions. The calibration factor is continuously updated during operation to optimize the relationship between pump command and motor speed, allowing the system to adapt to changing operational conditions and prevent overspeed events.
2Reliability
If the hydraulic pump decreases pump command to prevent overspeed, then component wear is reduced, but productivity and speed output decrease
Solution Approach 1:
The system changes the calibration factor parameter based on detected speed conditions. By adjusting this calibration parameter, the control system optimizes the pump command to motor speed relationship, allowing maximum productivity within safe operational limits and preventing unnecessary speed reductions that would harm productivity.
Solution Approach 2:
The patent replaces mechanical speed-limiting mechanisms with an electronic control system that uses sensors and processors to monitor and adjust pump commands. This substitution allows for more precise and responsive speed control, maintaining productivity while preventing overspeed conditions through intelligent algorithmic control rather than mechanical constraints.
3Measurement precision
If calibration protocol is continuously active to maintain precise speed control, then speed accuracy improves, but system complexity and processing requirements increase
Solution Approach 1:
The calibration protocol is executed periodically or event-driven rather than continuously. The system triggers calibration routines at specific intervals or when certain conditions are met, reducing processor burden and system complexity while maintaining adequate speed control accuracy for normal operational requirements.
Data Source
AI summary
A hydraulic system for a work vehicle includes a hydraulic motor configured to generate rotational power for one or more wheels on the work vehicle. The hydraulic system also includes a hydraulic pump coupled to the hydraulic motor, wherein the hydraulic pump is configured to pump hydraulic fluid to the hydraulic motor. The hydraulic system further includes a hydraulic control system with a processor that is configured to receive one or more inputs indicative of a speed of the hydraulic motor and to trigger a calibration protocol in response to determining that the one or more inputs indicate occurrence of an overspeed condition or an underspeed condition. The processor is also configured to set a maximum pump command for the hydraulic pump, a minimum motor volume command for the hydraulic motor, or both based on a calibration factor generated by the calibration protocol.