PTO Clutch Temperature Calculation via Operational Parameters
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Solution Overview
Problem
Conventional power take-off (PTO) clutch systems in four-wheel and all-wheel drive vehicles are prone to overheating due to high torque input, leading to potential damage and costly repairs, as they often rely on expensive and unreliable temperature sensors for protection.
Innovation Solution
A control system that calculates the clutch system temperature using vehicle operational parameters such as input and output speeds, slip, torque, current power, accumulated power, and temperature delta, allowing the electronic control unit to selectively disable the clutch system before it reaches a critical temperature, eliminating the need for additional sensors and wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are installed in the clutch assembly to directly measure temperature, then accurate measurement of clutch system temperature is achieved, but additional cost of sensors and wiring is incurred and reliability decreases due to potential sensor failure
Solution Approach 1:
The patent replaces the mechanical/physical temperature sensing system with an electronic calculation-based system. The ECU calculates clutch temperature by processing signals from existing sensors (torque, speed, power) rather than using direct temperature sensors, thereby eliminating the reliability issues associated with physical sensors while maintaining measurement accuracy.
Solution Approach 2:
The patent introduces an intermediary calculation process within the ECU that uses existing vehicle operational parameters (torque, speed, power) as mediators to determine clutch temperature. This indirect measurement approach avoids the need for direct temperature sensing while providing accurate temperature monitoring through mathematical relationships between operational parameters and thermal state.
2Measurement precision
If direct temperature sensors are used to monitor clutch temperature, then accurate temperature measurement is achieved, but the system complexity and cost increase due to additional sensors and wiring
Solution Approach 1:
The patent makes the existing ECU and its existing sensors (torque, speed, power) serve multiple functions. The same sensors and processing unit used for general vehicle control are also used for clutch temperature monitoring, eliminating the need for dedicated temperature sensing hardware and reducing overall system complexity.
Solution Approach 2:
The patent merges the clutch temperature monitoring function with the existing vehicle control system. By combining multiple monitoring functions (torque, speed, power, and now temperature) into a single ECU processing architecture, the system reduces complexity while maintaining comprehensive monitoring capabilities.
3Reliability
If the clutch system is disabled when temperature exceeds critical temperature, then clutch pack damage is prevented, but productivity is reduced due to temporary operation stoppage
Solution Approach 1:
The patent implements preliminary protective action by continuously monitoring clutch temperature through calculation and preparing to disable the clutch before critical damage occurs. The system proactively manages temperature by selective disabling rather than reactively responding to sensor-triggered alarms, ensuring protection while minimizing operational disruption.
Data Source
AI summary
Clutch control systems for a power take-off system of a vehicle, such as those employing all-wheel and four-wheel drive systems. The control system calculates the temperature of the clutch system, based on one or more vehicle operational parameters. If the clutch system reaches a pre-determined temperature limit, the control system selectively stops the operation of the clutch system until the clutch temperature drops below the pre-determined temperature limit. The control system includes an electronic control unit, e.g., a computer or microprocessor, that calculates and/or processes one or more vehicle operational parameters, including, but not limited to: (1) clutch input and output speeds; (2) slip across the clutch; (3) clutch torque; (4) current clutch power; (5) accumulated clutch power; (6) temperature delta (i.e., change) of the clutch; and (7) clutch temperature.