Slip Control System for Work Machine Traction
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Solution Overview
Problem
Existing slip control systems for self-propelled work machines with electric drive propulsion systems lack the ability to optimize slip for different ground conditions and allow operator selection of desired tractive efficiency, leading to inefficient fuel consumption and wear due to excessive slip.
Innovation Solution
A slip control system that includes an actual slip calculator, a ground condition selector, and a desired slip calculator, coupled with a slip controller, which adjusts the torque output of the electric drive propulsion system to achieve the desired slip based on actual and desired slip signals, optimizing tractive efficiency and controlling slip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If drawbar force is increased to improve productivity, then productivity is improved, but slip increases leading to higher energy consumption and wear
Solution Approach 1:
The slip control system continuously monitors actual slip through sensors measuring wheel speed and ground speed, compares it to desired slip values, and automatically adjusts engine power output via the controller to maintain optimal slip levels, creating a closed-loop feedback system that prevents excessive energy loss
Solution Approach 2:
The system dynamically changes the engine power parameter based on measured slip conditions, adjusting the power output to maintain slip within an optimal range that maximizes drawbar force while minimizing energy consumption and wear
2Productivity
If drawbar force is increased to improve productivity, then productivity is improved, but wear on the machine increases due to excessive slip
Solution Approach 1:
The slip control system uses continuous feedback from speed sensors to detect excessive slip conditions and automatically reduces engine power to prevent wear, while still maintaining sufficient drawbar force for productive operation
Solution Approach 2:
The system adjusts the engine power parameter in real-time based on slip measurements, changing it to prevent excessive wear while maintaining productivity, thereby reducing harmful wear effects
3Loss of energy
If slip control system is added to optimize tractive efficiency, then tractive efficiency is improved, but device complexity increases
Solution Approach 1:
The controller serves multiple functions: it manages normal engine operation, calculates desired slip based on ground conditions, monitors actual slip through sensor inputs, and performs slip control adjustments, consolidating these functions into a single multi-functional device
Solution Approach 2:
The system uses the machine's existing speed sensors and controller infrastructure to perform slip measurement and control, rather than requiring entirely separate dedicated components, allowing the existing system to serve the additional slip optimization function
Data Source
AI summary
A system is provided for controlling slip of a ground-engaging traction device of a work machine. The system includes an actual slip calculator operable to transmit an actual slip signal corresponding to an actual slip experienced by the work machine. The system also includes a ground condition selector operable to transmit a ground condition signal corresponding to a selected ground condition. A desired slip calculator is operable to transmit a desired slip signal based on the ground condition signal. A slip controller is coupled with the actual slip calculator and the desired slip calculator. The slip controller is operable to transmit a slip control signal based on the actual slip signal and the desired slip signal. The slip control signal controls the actual slip experienced by the work machine to achieve the desired slip.