Automated Differential Lock via ABS Sensor Feedback
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Solution Overview
Problem
Current locking differential drive axles in vehicles require manual activation and deactivation, which can be hazardous and inefficient, especially in high-speed or off-road conditions, and existing systems struggle with automatic locking/unlocking during wheel spin and turning events, leading to reduced traction and increased tire wear.
Innovation Solution
An electronic controller integrated with the ABS traction control system allows for automatic locking and unlocking of the differential axle at any vehicle speed, up to a predetermined maximum, enhancing traction by synchronizing wheel rotation based on speed and traction differences, without significant mechanical modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual locking/unlocking mechanism is used, then driver control is maintained, but hazardous stopping is required and operational efficiency deteriorates
Solution Approach 1:
The differential locking system automatically detects wheel slip conditions and activates locking without driver intervention. The system monitors wheel speeds via ABS sensors and autonomously engages the locking mechanism when slip is detected, eliminating the need for manual operation while maintaining safety and reliability.
Solution Approach 2:
The patent replaces manual mechanical operation with an electronic control system that uses ABS wheel speed sensors and a controller to automatically activate the differential lock. This substitution of mechanical manual control with electronic automation resolves the contradiction between reliability and ease of operation.
2Force
If differential is locked during wheel spin, then traction is improved, but wheel spin detection capability is lost
Solution Approach 1:
The system performs preliminary detection of wheel slip conditions using ABS sensors before activating the differential lock. By detecting wheel speed differences in advance and engaging the lock proactively, the system maintains traction while continuing to monitor wheel speeds for ongoing detection capability.
Solution Approach 2:
The differential locking system incorporates continuous feedback from ABS wheel speed sensors that monitor wheel speeds even when locked. This feedback loop allows the system to detect ongoing wheel spin conditions, adjust locking status, and maintain both traction and detection capability simultaneously.
3Extent of automation
If mechanical coupler locking system is used, then automatic locking is achieved, but vehicle stopping is required which increases loss of time
Solution Approach 1:
The patent replaces the mechanical coupler system with an electronic control system that uses ABS sensors and a controller to activate the differential lock. This electronic substitution eliminates the requirement for vehicle stopping, achieving automatic locking without the time loss associated with mechanical coupler systems.
4Extent of automation
If clutch pack limited-slip system is used, then automatic engagement at any speed is achieved, but understeering occurs on low friction surfaces
Solution Approach 1:
The system changes the activation parameters by using ABS-detect ed wheel slip conditions as the trigger for differential locking, rather than relying on clutch pack friction characteristics. This parameter change allows automatic engagement at any speed while preventing understeer by locking only when genuine wheel slip is detected, not during normal turning operations.
Data Source
AI summary
A differential locking axle control system that can cause the axle to automatically lock and unlock at any vehicle speed, up to a predetermined maximum speed, or any wheel spin rate up to a predetermined maximum, when a vehicle is being steered either in a straight line or around a curve while taking traction and global positioning factors into account.