Working Machine Traction Control via Dynamic Wheel Slip Adaptation
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Solution Overview
Problem
Existing traction-related speed control methods for working machines are limited by a constant upper slip limit, which restricts the application across various ground conditions, leading to suboptimal traction efficiency and potential ground damage due to excessive power loss.
Innovation Solution
A method that dynamically adjusts the rotational speed of the drive unit and transmission to maintain the least possible wheel slip by continuously monitoring and adapting to changes in driving speed and traction conditions, using a control unit and sensors to ensure the working machine operates within specified speed requirements while minimizing slip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a constant upper limit is specified for the permissible drive slip, then the control system is simple and easy to implement, but the working machine cannot bring to bear its full drive torque under all ground conditions, leading to suboptimal traction efficiency
Solution Approach 1:
The patent applies dynamics by transitioning from a static constant slip limit to a dynamic slip limit that adapts to changing ground conditions. The control system continuously monitors actual driving speed and calculates wheel slip in real-time, adjusting the permissible slip limit dynamically based on current traction conditions, thereby optimizing propulsion force utilization across varying operational environments
Solution Approach 2:
The patent implements feedback by continuously measuring actual driving speed, calculating wheel slip based on the difference between theoretical and actual speeds, and using this feedback to adjust the slip limit and propulsion force. This closed-loop control enables the system to respond to changing ground conditions and maintain optimal traction efficiency
2Speed
If the rotational speed of wheels is increased to maintain target driving speed, then the driving speed requirement is met, but power loss at the driven wheels increases and ground damage occurs
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the slip limit parameter based on actual driving conditions. When ground conditions deteriorate or the machine is carrying heavy loads, the system increases the permissible slip limit, allowing higher wheel speeds without excessive power loss or ground damage, thereby optimizing the balance between speed maintenance and energy efficiency
3Object-affected harmful factors
If the wheel slip is reduced to minimize ground damage, then ground care is improved, but the working machine cannot maintain optimal speed under varying traction conditions
Solution Approach 1:
The system dynamically adjusts the slip limit based on actual driving conditions rather than maintaining a fixed low slip value. This enables the machine to tolerate higher slip when necessary to maintain speed under poor traction conditions, while still minimizing ground damage when conditions are favorable, achieving an adaptive balance between ground care and speed maintenance
Data Source
AI summary
A method (A) for the traction-related control of a drive-train of a working machine (1) having a drive unit (2), a transmission (3), a control unit (10) and first and second vehicle axles (7, 9) each supporting wheels (6, 8). At least one of the vehicle axles (7, 9) being driven, and following the entry of a drive requirement relating to a driving speed, wheel slip is iteratively reduced by adapting a rotational speed of the wheels (6, 8) of the driven vehicle axle (7, 9).