Lockable Differential Controller Inhibits Locking on Slip
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing powertrain systems for mobile machines, such as scrapers and trucks, face issues with differential locking that can lead to damage and excessive wear due to improper timing and lack of consideration for specific machine parameters, particularly during automated unlocking processes.
Innovation Solution
A powertrain system with a controller that inhibits differential locking based on sensor-generated signals indicating deviations from acceptable parameters, allowing for manual input while preventing damage by automatically overriding operator commands when conditions are detrimental to the differential's health.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the differential is manually locked to prevent slipping, then traction is improved, but the differential may be damaged if locked during high-speed slipping conditions
Solution Approach 1:
The controller continuously monitors slip conditions through sensors and uses this feedback to determine whether to inhibit the locking command. The system measures the difference in rotational speed between paired traction devices and compares it against threshold values to make intelligent locking decisions, preventing damage while maintaining traction when needed.
Solution Approach 2:
The controller evaluates slip conditions before allowing the differential to lock, performing a preliminary check of the speed difference between traction devices. This preliminary assessment prevents locking from occurring during conditions that would cause damage, while still allowing locking when slip conditions are acceptable.
2Productivity
If the differential is locked to improve traction, then machine mobility is enhanced, but excessive wear occurs if locked longer than necessary
Solution Approach 1:
The controller continuously monitors traction conditions and automatically unlocks the differential when slip conditions improve or when the machine transitions to operations where locking is unnecessary (such as cornering). This feedback-based control ensures the differential remains locked only as long as needed, preventing excessive wear while maintaining mobility when required.
Solution Approach 2:
The differential locking system transitions from a static, manually-held state to a dynamic, automatically-controlled state. The system adapts the locking duration based on real-time operational conditions, automatically adjusting when to lock and unlock to optimize both productivity and component life.
3Reliability
If automated differential control is implemented, then timing problems are reduced, but the system complexity increases
Solution Approach 1:
The controller integrates multiple functions into a single device: it monitors slip conditions, determines locking timing, controls the locking mechanism, and adapts to different machine operations. This multi-functional approach improves timing reliability without proportionally increasing system complexity, as one controller handles what would otherwise require multiple separate systems.
Data Source
AI summary
A powertrain system for a mobile machine is disclosed. The powertrain system may have a power source, a plurality of traction devices, and a differential operatively connecting an output of the power source with the plurality of traction devices. The powertrain may also have a manual input device movable by an operator to generate a first signal indicative of a desire to lock the differential, at least one sensor configured to generate a second signal indicative of a parameter of the mobile machine, and a controller in communication with the at least one sensor, the manual input device, and the differential. The controller may be configured to inhibit locking of the differential based on the first signal when the second signal indicates the parameter deviating from an acceptable range.