Wheel Loader Differential Lock Control for Stable Loading
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Solution Overview
Problem
Existing automatic systems for locking and unlocking the differential of work vehicles, such as wheel loaders, are not precise enough to recognize loading conditions and are not quick enough to unlock when needed, leading to instability during operations.
Innovation Solution
A differential lock system with an electronic control unit that uses a combination of sensors to detect specific conditions such as vehicle speed, pressure, travel direction, hydraulic function, boom and bucket positions, and engine speed to automatically lock or unlock the differential, ensuring precise and quick control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If automatic systems are used to recognize loading conditions, then the differential locking operation is automated, but the precision of recognizing loading conditions is insufficient
Solution Approach 1:
The automatic differential locking system is segmented into multiple independent sensor modules, each detecting specific parameters (vehicle speed, pressure, travel direction, hydraulic function, boom position, bucket position, engine speed). This segmentation allows each sensor to specialize in detecting its specific parameter with high precision, and the electronic control unit integrates these individual detections to achieve precise overall loading condition recognition.
Solution Approach 2:
The electronic control unit serves multiple functions: it receives data from all sensor modules, processes the data to determine loading conditions, controls the differential locking mechanism, and monitors travel direction. This multi-functionality consolidates the automation system into a unified controller that can precisely recognize loading conditions by integrating information from multiple sources.
2Extent of automation
If automatic systems are used to recognize loading conditions, then the differential locking operation is automated, but the speed of unlocking the differential is insufficient
Solution Approach 1:
The sensor modules continuously monitor vehicle speed and travel direction in advance. When the travel direction changes or vehicle speed exceeds the threshold, the system detects these conditions beforehand and quickly triggers the differential unlocking action, ensuring rapid response without waiting for loading condition analysis.
Solution Approach 2:
The electronic control unit continuously receives real-time feedback from sensors monitoring vehicle speed and travel direction. This feedback mechanism allows the system to immediately detect when unlocking conditions are met (speed threshold exceeded or direction change) and rapidly actuate the differential unlock, achieving fast response through continuous monitoring and immediate action.
3Measurement precision
If multiple sensors are used to detect loading conditions, then the precision of condition detection is improved, but the device complexity increases
Solution Approach 1:
Multiple sensor modules detecting different parameters (vehicle speed, pressure, travel direction, hydraulic function, boom position, bucket position, engine speed) are merged into a single electronic control unit for centralized processing. This consolidation integrates the functions of multiple sensors and the control unit into one system, reducing overall device complexity while maintaining high detection precision through multi-parameter monitoring.
4Stability of the object's composition
If the differential is locked during loading operations, then the stability of the vehicle is improved, but the controllability during travel is reduced
Solution Approach 1:
The differential locking system operates dynamically, automatically adjusting its state based on real-time detection of vehicle operating conditions. The system locks the differential when loading conditions are detected (improving stability during loading) and unlocks it when travel conditions are detected such as when vehicle speed exceeds the threshold or travel direction changes (restoring controllability during travel). This dynamic adaptation allows the system to optimize both stability and controllability according to actual operating needs.
Data Source
Figure 1
AI summary
Earth moving vehicle (1) provided with a bucket carried by a boom to execute a work operation, comprising a torque source (2), a hydrostatic transmission (3) and a pair of axles (4, 5) provided with wheels (6), the wheels (6) being operatively connected to the hydrostatic transmission (3) via differential means (7) provided on each axle (4, 5), the vehicle (1) comprising differential lock means (12) configured to selectively lock or unlock the differentials (7), these latter being controlled by an electronic control unit (13) configured to provide a control signal (C), configured to assume a first value configured to lock the differentials (7) and a second value configured to unlock the differentials (7), the vehicle (1) comprising a plurality of sensors means (101-108) configured to detect physical quantities related to the operation of the vehicle, and an electronic control unit (13) electrically connected to the sensors means (101-108) to acquire their detected data and elaborate the aforementioned control signal (C).