PTO Clutch Pressure Control for Smooth Work Vehicle Engagement
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Solution Overview
Problem
Existing control logic for hydraulically actuated clutches in power-take-off assemblies of work vehicles does not account for wear and damage, leading to abrupt engagement, reduced mechanical resistance, and potential operator hazards due to jerks or oscillations.
Innovation Solution
A method and apparatus that utilize a solenoid-controlled proportional hydraulic valve and closed-loop control to modulate hydraulic pressure based on the angular velocity ratio between input and output shafts, ensuring smooth and stepless engagement of the PTO clutch, compensating for wear or damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional control logic is used for the hydraulically actuated clutch, then the structure is simple and cost-effective, but the engagement becomes abrupt and causes jerks or oscillations due to wear and damage over time
Solution Approach 1:
The control unit continuously monitors the rotational speed of the PTO shaft and uses this feedback to dynamically adjust the clutch engagement process. By comparing the actual rotational speed with the desired speed, the system can detect wear-induced engagement issues and compensate in real-time, ensuring smooth operation despite clutch degradation over time.
Solution Approach 2:
The system dynamically adjusts the clutch engagement parameters based on real-time operational conditions and detected wear patterns. Rather than using fixed engagement control, the system adapts the engagement profile to maintain optimal performance, transitioning from static control to dynamic adaptation as the clutch ages.
2Ease of operation
If the clutch is engaged without compensation for wear, then the control process is simple, but mechanical resistance decreases and operator safety is compromised due to jerks or oscillations
Solution Approach 1:
The control unit continuously monitors the rotational speed of the PTO shaft and uses this feedback to dynamically adjust the clutch engagement process. By comparing the actual rotational speed with the desired speed, the system can detect wear-induced engagement issues and compensate in real-time, ensuring smooth operation despite clutch degradation over time.
Solution Approach 2:
The system prepares for potential engagement problems by implementing a controlled, progressive engagement sequence that anticipates wear-related issues. The multi-stage engagement process with monitoring built-in acts as a preventive measure, cushioning against the harmful effects of wear before they can manifest as dangerous jerks or oscillations.
3Reliability
If traditional engagement control is used, then the device is cost-effective, but the clutch may not engage correctly over the useful life of the work vehicle
Solution Approach 1:
The control unit continuously monitors the rotational speed of the PTO shaft and uses this feedback to dynamically adjust the clutch engagement process. By comparing the actual rotational speed with the desired speed, the system can detect wear-induced engagement issues and compensate in real-time, ensuring smooth operation despite clutch degradation over time.
Solution Approach 2:
The system dynamically adjusts the clutch engagement parameters based on real-time operational conditions and detected wear patterns. Rather than using fixed engagement control, the system adapts the engagement profile to maintain optimal performance, transitioning from static control to dynamic adaptation as the clutch ages.
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
Ensures smooth and progressive engagement of the PTO assembly, preventing jerks and oscillations, and maintaining correct engagement despite wear or damage, optimizing clutch performance over the vehicle's lifetime.
Implementation Method 1
A method and apparatus that utilize a solenoid-controlled proportional hydraulic valve and closed-loop control to modulate hydraulic pressure based on the angular velocity ratio between input and output shafts
Implementation Method 2
A method and apparatus that utilize a solenoid-controlled proportional hydraulic valve
Data Source
Figure 1
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Figure 4
AI summary
There is described method for controlling the engagement of a power-take-off assembly (4) of a work vehicle (1); the power-take-off assembly (4) is coupled to a powertrain assembly (2) of the work vehicle (1) for transmitting torque to a work implement carried by the work vehicle (1); the power-take-off assembly (4) comprises: an input shaft (6) carried by the powertrain assembly (2); an output shaft (8) connectable to the work implement; a power-take-off clutch (10) interposed between the input shaft (6) and the output shaft (8), and adapted to selectively engage the output shaft (8) with the input shaft (6); and electrically actuated valve means (12), which are interposed between the power-take-off clutch (10) and a source of pressurized fluid (16), to control the flow of the pressurized fluid fed towards the power-take-off clutch (10) control its engagement; the proposed method allows to control the engagement of the power-take-off assembly (4) in a progressive manner.