Transmission Torque Distribution Control via Self-Locking Compensation
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Solution Overview
Problem
Existing transmission devices in vehicles, equipped with differentials, face challenges in adjusting driving dynamics due to the compensatory effect of differentials, which can lead to inability to move forward in slippery conditions, requiring complex control and adjustment to distribute torque between wheels.
Innovation Solution
A method to distribute torque between output shafts with a variable degree of distribution, using a mechanical self-locking torque calculation and adjusting the transmission capability of a shift element to set a target overall locking torque, allowing for precise control and high actuating dynamics, enabling desired driving dynamics with minimal complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a differential is used to distribute torque between drive wheels, then the drive wheels can rotate at different speeds, but the torque distribution becomes dependent on the lower transmissible torque of any single drive wheel
Solution Approach 1:
The patent implements a dynamically adjustable torque distribution mechanism that can switch between different distribution modes (e.g., 50:50, 70:30, 100:0) based on detected driving conditions. The system transitions from a static differential to a dynamic torque management system that adapts its characteristics in real-time, allowing optimal torque allocation to each drive wheel regardless of the limiting wheel's capabilities.
Solution Approach 2:
The system changes the torque distribution parameter dynamically by detecting wheel slip, road conditions, and vehicle state. When slip is detected on one wheel, the system alters the torque distribution ratio to compensate, using sensors and control algorithms to adjust the parameter in response to changing conditions rather than maintaining a fixed distribution.
2Force
If a differential lock is implemented to prevent compensatory movement, then torque distribution control is improved, but the device complexity and control requirements increase
Solution Approach 1:
The patent replaces complex mechanical differential lock mechanisms with an electronically controlled torque distribution system. Instead of using mechanical locking elements, cables, and linkages, the system uses electronic sensors, processors, and actuators to achieve torque control, reducing mechanical complexity while improving precision and responsiveness.
Solution Approach 2:
The system incorporates self-diagnosis and automatic adjustment capabilities, where the control unit continuously monitors vehicle state and automatically optimizes torque distribution without requiring manual intervention. The system serves itself by detecting its own operating conditions and making real-time adjustments to maintain optimal performance.
3Force
If hydraulic actuators are used for differential lock operation, then actuating force is sufficient, but requirements on actuating accuracy and dynamics increase
Solution Approach 1:
The patent replaces hydraulic actuation systems with electric motors or electromagnetic actuators for torque distribution control. This substitution eliminates the need for high-pressure hydraulic systems, complex valve controls, and fluid management, while providing precise digital control over actuator position and force application, thereby improving both accuracy and response dynamics.
Data Source
AI summary
A method of operating a transmission device comprising at least one input shaft and at least two output shafts. Torque that is present at the input shaft can be distributed between the two output shafts with a variable degree of distribution which can be changed according to the operating state depending on a transmission capability of at least one shift element. When a request to set a predefined degree of distribution is received, a mechanical self-locking torque of the transmission device—which influences the degree of distribution between the output shafts and is dependent upon the torque present at the input shaft—is determined, and a difference between the mechanical self-locking torque and a target overall locking torque of the transmission device that is equivalent to the required degree of distribution is determined. The transmission capability of the at least one shift element is set depending on this difference.