Traction Vehicle Wheel Slip Control via Clutch Pressure Modulation
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Solution Overview
Problem
Traction vehicles experience reduced productivity and surface quality degradation due to excessive wheel slip in low traction conditions, with existing solutions relying on operator intervention or limited torque control.
Innovation Solution
A vehicle traction control system with a controller that monitors wheel slip and adjusts clutch pressure to modulate output torque, incorporating a clutch slip sensor to automatically regulate wheel slip by controlling clutch pressure and engine speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic traction control is implemented to reduce wheel slip, then productivity and surface quality improve, but device complexity increases due to additional sensors and control systems
Solution Approach 1:
The system employs wheel slip sensors and clutch slip sensors that continuously monitor wheel rotation and clutch engagement, feeding this data back to the controller. The controller automatically adjusts clutch pressure based on detected wheel slip conditions, creating a closed-loop feedback system that reduces wheel slip without requiring constant operator intervention, thereby improving productivity while managing complexity through automated control
Solution Approach 2:
The traction control system operates autonomously by detecting wheel slip conditions and automatically modulating clutch pressure to prevent excessive wheel slip. The system serves itself by using onboard sensors and controllers to manage traction without external intervention, reducing the need for operator workload while maintaining improved productivity and surface quality
2Object-affected harmful factors
If clutch pressure is reduced to prevent wheel slip, then wheel slip decreases, but power transmission efficiency is reduced
Solution Approach 1:
The system applies partial clutch slip rather than complete disengagement, allowing just enough clutch slip to prevent wheel slip while maintaining sufficient power transmission. The controller modulates clutch pressure to achieve optimal balance, applying only the necessary degree of torque limitation to control wheel slip without excessive energy loss, thereby partially acting on the clutch to achieve both goals
Solution Approach 2:
The controller dynamically changes clutch pressure parameters based on real-time wheel slip detection and clutch slip feedback. By continuously adjusting the clutch pressure parameter within an optimal range, the system prevents wheel slip while maintaining adequate power transmission efficiency, avoiding fixed pressure settings that would either cause excessive wheel slip or unnecessary energy loss
3Reliability
If clutch slip is monitored and controlled, then wheel slip regulation improves, but measurement and control difficulty increases
Solution Approach 1:
The system uses clutch slip sensors as intermediary devices that indirectly measure wheel slip conditions by detecting clutch engagement state and relative motion between clutch plates. This intermediary measurement approach simplifies the control task by providing a proxy indicator of wheel slip without requiring direct measurement of wheel-ground interaction, thereby improving regulation reliability while reducing measurement difficulty
Solution Approach 2:
The system replaces complex mechanical measurement mechanisms with electronic sensors and controllers that detect clutch slip and wheel rotation electronically. This substitution of mechanical measurement systems with electronic sensing and control reduces the difficulty of detection and measurement while improving the reliability and precision of wheel slip regulation through more accurate and responsive data acquisition
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
The system improves vehicle productivity, reduces operator workload, and enhances surface quality by automatically managing wheel slip, ensuring optimal traction in low traction conditions.
Implementation Method 1
The transmission has a controllable clutch pressure between the input side and the output side
Data Source
AI summary
A vehicle traction control system for a vehicle, in which the vehicle has a prime mover, at least one wheel for providing tractive effort on a support surface, and a transmission having an input side operably coupled to the prime mover and an output side operably coupled to the at least one wheel, and in which the transmission has a controllable clutch pressure between the input side and the output side, includes a controller operable to monitor wheel slip of the at least one wheel. When wheel slip is detected the controller is operable to control the clutch pressure for modulating an output torque of the transmission for reducing the wheel slip. The clutch pressure can be controlled as a function of clutch slip.