LSD Clutch Torque Compensation via Driveline Feedback
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Solution Overview
Problem
Existing differential gear mechanisms face challenges in configuring limited slip differential (LSD) clutch torque compensation to achieve optimal driveline torque bias, particularly in optimizing packaging space and accurately determining clutch torque based on vehicle direction and driveline torque.
Innovation Solution
A method is developed to determine the necessary clutch torque for a limited slip differential gear mechanism by estimating driveline torque, establishing a desired bias torque, and calculating clutch torque using distinct equations for left and right turns, taking into account the differential gear bias torque generated by the bevel gear set, which reduces commanded clutch torque as driveline torque increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clutch torque compensation is implemented to achieve optimal driveline torque bias, then traction control efficiency is improved, but device complexity increases due to additional sensing and control components
Solution Approach 1:
The system uses a sensor to detect actual driveline torque and feeds this information back to the controller, which then adjusts clutch torque commands in real-time to achieve desired bias torque. This closed-loop feedback mechanism enables precise traction control while using standard differential components.
Solution Approach 2:
The patent replaces complex mechanical torque sensing and adjustment mechanisms with an electronic control system that uses sensors and actuators to achieve the same torque biasing function, thereby improving control precision without requiring elaborate mechanical structures.
2Volume of moving object
If packaging space is optimized in the differential case, then vehicle space utilization is improved, but difficulty in configuring LSD clutch components increases
Solution Approach 1:
The clutch mechanism is designed with movable components that can dynamically adjust their position and engagement characteristics based on operational requirements. This dynamic design allows the same compact structure to accommodate varying clutch configurations without increasing overall differential case volume.
Solution Approach 2:
The differential case is designed with a universal clutch mounting structure that can accommodate different clutch pack configurations and sizes. This multi-functional design approach allows the same basic case structure to be used across different vehicle platforms and clutch designs, simplifying manufacturing while optimizing space.
3Reliability
If clutch torque is increased to achieve desired bias torque, then torque distribution control is improved, but energy loss in the clutch pack increases
Solution Approach 1:
The controller applies partial clutch torque rather than full engagement, using only the amount of clutch torque necessary to achieve the desired bias torque ratio. This partial action approach maintains precise torque distribution control while minimizing unnecessary frictional energy losses in the clutch pack.
Solution Approach 2:
The system dynamically adjusts clutch torque parameters based on real-time driveline conditions, slip detection, and desired bias ratios. By continuously optimizing the clutch torque parameter rather than maintaining a fixed high torque level, the system achieves effective torque distribution while reducing energy loss during normal operating conditions.
Data Source
AI summary
A method of determining clutch torque for a limited slip differential gear mechanism on a vehicle includes obtaining an estimated driveline torque. A desired bias torque is established. A necessary clutch torque required to achieve the desired bias torque is determined. The necessary clutch torque is commanded based on the estimated driveline torque to achieve the desired bias torque.