Inner Wheel Braking Control With LSD Torque Feedback for Yaw Moment
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Solution Overview
Problem
Existing vehicle control systems with limited slip differentials face challenges in effectively increasing yaw moment through inner wheel braking, as the operation of the limited slip differential mechanism and inner wheel braking control can interfere with each other, limiting the achievable yaw moment.
Innovation Solution
A vehicle control apparatus that includes a target yaw moment setter and a target braking force setter, which incrementally corrects the braking force based on the transmission torque from the turning inner wheel to the turning outer wheel, allowing for enhanced yaw moment generation by optimizing the braking force applied to the turning inner wheel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If braking force is applied to the turning inner wheel to increase yaw moment, then yaw moment is improved, but the limited slip differential's torque transmission is interfered with, causing reduction in achievable yaw moment
Solution Approach 1:
The control device introduces feedback by detecting the transmission torque of the limited slip differential and using it to incrementally correct the target braking force. The feedback control unit continuously monitors the actual torque transmission and adjusts the braking force accordingly, ensuring that the braking operation does not interfere with the limited slip differential's torque transmission function, thus resolving the contradiction between generating yaw moment and maintaining torque transmission reliability
Solution Approach 2:
The system dynamically adjusts the braking force based on real-time conditions. By incrementally correcting the target braking force according to the detected transmission torque, the system adapts the braking intensity to the current operational state, allowing optimal yaw moment generation while preserving the limited slip differential's ability to transmit torque effectively
2Force
If braking force is increased to enhance yaw moment generation, then yaw moment is improved, but continuity of yaw moment control is reduced due to torque absorption by braking
Solution Approach 1:
The feedback control unit continuously detects the transmission torque and incrementally corrects the target braking force to maintain continuous yaw moment control. By using real-time feedback on torque transmission, the system ensures that braking force application does not create interruptions or gaps in yaw moment generation, preserving the continuity of control action
Solution Approach 2:
The system maintains continuous useful action by ensuring that yaw moment control remains effective throughout the braking process. The incremental correction of braking force based on transmission torque detection prevents complete absorption of torque by braking, ensuring that yaw moment generation continues uninterrupted and maintains its useful effect throughout the maneuver
Data Source
AI summary
A vehicle control apparatus is applied to a vehicle including a turning inner wheel, a turning outer wheel, and a limited slip differential. The vehicle control apparatus includes a target yaw moment setter, a target braking force setter, and a braking device. The target yaw moment setter sets a target yaw moment of the vehicle. The target braking force setter sets a target braking force to be added to the turning inner wheel based on the target yaw moment. The braking device adds a braking force to the turning inner wheel based on the target braking force. The target braking force setter incrementally corrects the target braking force based on a transmission torque transmitted from the turning inner wheel to the turning outer wheel by the limited slip differential.