PTO Clutch Engagement Control via Dynamic Torque Adjustment
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Solution Overview
Problem
Conventional power take-off (PTO) clutch control systems for work vehicles lack the ability to precisely control clutch engagement across a wide range of implement inertial loads, often resulting in engine stall and clutch damage.
Innovation Solution
A method and system that involve a computing device transmitting control signals to initiate PTO clutch engagement, calculating clutch slippage energy and engagement time, and determining torque commands to control engagement based on remaining time, ensuring stable clutch engagement without exceeding engine or clutch power thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional PTO clutch control systems are used to engage the clutch, then the clutch engagement process is simple, but the system cannot precisely control engagement across a wide range of implement inertial loads, resulting in engine stall and clutch damage
Solution Approach 1:
The control system dynamically adjusts the torque command to the clutch valve during engagement based on real-time calculation of remaining engagement time and clutch power thresholds. The torque command is continuously updated as the clutch transitions from disengaged to engaged state, allowing precise control adaptation to varying implement inertial loads without requiring multiple fixed control modes.
Solution Approach 2:
The system calculates clutch slippage energy and remaining engagement time based on the difference between input and output shaft speeds, then uses this feedback to determine the torque command. The controller continuously monitors clutch power and compares it against predefined thresholds, adjusting the torque command accordingly to prevent both under-engagement and over-engagement conditions.
2Speed
If the clutch engagement torque is increased to speed up engagement, then the engagement time is reduced, but the instantaneous clutch power may exceed the clutch power threshold causing clutch damage
Solution Approach 1:
The torque command is dynamically adjusted during the engagement process based on the calculated remaining engagement time. As the clutch approaches full engagement (when remaining time approaches zero), the torque command is automatically reduced to ensure instantaneous clutch power does not exceed the predefined threshold, preventing clutch damage while maintaining fast engagement throughout the process.
Solution Approach 2:
The control system operates in discrete control cycles, calculating clutch slippage energy and remaining engagement time at each cycle, then updating the torque command accordingly. This periodic control approach allows the system to respond to changing engagement conditions while maintaining power threshold compliance through repeated measurement and adjustment.
3Strength
If the clutch engagement torque is decreased to protect the clutch, then clutch damage is prevented, but the engagement time increases and engine stall may occur
Solution Approach 1:
The torque command starts high during early engagement to quickly reduce the speed difference between input and output shafts, then dynamically decreases as the clutch approaches full engagement. This dynamic torque profile enables fast initial engagement to prevent engine stall, then automatically reduces torque near the end to prevent clutch damage from excessive power, achieving both short engagement time and clutch protection.
Solution Approach 2:
The system changes the torque parameter throughout the engagement process based on the calculated remaining engagement time and clutch slippage energy. By continuously adjusting this critical parameter, the system achieves optimal engagement speed initially, then transitions to protective torque levels near completion, resolving the contradiction between engagement speed and clutch durability.
4Adaptability or versatility
If a fixed torque command is used during clutch engagement, then the control system is simple, but it cannot accommodate varying implement inertial loads across different operating conditions
Solution Approach 1:
The control system calculates clutch slippage energy based on the difference between input and output shaft speeds, then uses this feedback to determine the remaining engagement time and adjust the torque command. This feedback mechanism enables the system to automatically adapt to varying implement inertial loads without requiring pre-programmed load profiles or complex decision logic, achieving versatility through real-time measurement and response.
Solution Approach 2:
The control algorithm determines the appropriate torque command autonomously by calculating remaining engagement time and comparing clutch power against predefined thresholds. The system serves itself by automatically adjusting torque based on real-time engagement progress, eliminating the need for external intervention or complex adaptive algorithms while accommodating varying load conditions.
Data Source
AI summary
A method for controlling engagement of a power take-off (PTO) clutch of a work vehicle may generally include transmitting, by a computing device, a control signal associated with initiating engagement of the PTO clutch, determining a clutch slippage energy generated during engagement of the PTO clutch due to clutch slippage and, while the PTO clutch is getting engaged, calculating a clutch engagement time remaining until engagement of the PTO clutch is completed based on the clutch slippage energy and a maximum clutch engagement energy associated with the PTO clutch. In addition, the method may include determining a torque command for controlling engagement of the PTO clutch as a function of the remaining clutch engagement time and controlling the engagement of the PTO clutch based on the torque command.