ABS Drive Torque Control to Prevent Wheel Lock During Braking
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Solution Overview
Problem
Current vehicles, especially hybrid and electric vehicles, face challenges in maintaining optimal power transmission during heavy braking due to temporary tire locking and excessive slip, which requires significant energy input and is influenced by roadway conditions, leading to unpredictable drive torque.
Innovation Solution
A power transmission system that applies drive torque to the wheel simultaneously with brake reduction during ABS intervention, providing torque before and after brake release to prevent locking and optimize slip, thereby enhancing deceleration and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ABS releases the brake when the wheel threatens to lock, then the wheel remains maneuverable and permanent locking is prevented, but temporary locking or excessive slip can still occur during heavy braking, requiring significant energy input to regain optimal power transmission
Solution Approach 1:
The drive torque is applied in advance when slip enters the control range of the ABS system, before the wheel actually locks. This preliminary action prevents the wheel from entering the excessive slip range, eliminating the need for subsequent energy-intensive corrective actions to regain optimal power transmission.
Solution Approach 2:
The drive torque application continues during the braking process while the wheel is still within the optimal slip range, ensuring continuous useful action. This maintains the wheel in the optimal power transmission range throughout braking, preventing temporary locking and eliminating the need for energy-intensive recovery actions.
2Reliability
If drive torque is applied to the wheel during braking to prevent locking, then optimal power transmission is maintained, but the braking effectiveness is reduced
Solution Approach 1:
The drive torque is applied at a level that is sufficient to maintain the wheel slip within the optimal range but not excessive enough to significantly counteract the braking force. This partial action achieves the goal of preventing wheel lockup while minimizing the reduction in braking effectiveness.
Solution Approach 2:
The system continuously monitors the slip of the wheel and adjusts the drive torque application accordingly. When slip enters the control range of the ABS system, drive torque is applied; when slip returns to the optimal range, drive torque is reduced or stopped. This feedback mechanism ensures optimal power transmission is maintained while minimizing interference with braking effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the time the wheel is unbraked, improves lateral guidance forces, and ensures optimal power transmission by actively managing slip and torque, enhancing vehicle stability and deceleration during braking.
Implementation Method 1
the drive is configured to drive the at least one wheel... using a drive torque... apply a drive torque to the wheel
Implementation Method 2
the at least one brake is configured to decelerate the at least one wheel... due to the friction of the tire on the roadway
Data Source
AI summary
A transmission system for a vehicle including a drive, at least one wheel and at least one brake having an ABS system. The drive is configured to drive the at least one wheel and the at least one brake is configured to brake the at least one wheel. The power transmission system is configured to also drive the at least one wheel braked by the at least one brake during a braking process, which enters a control range of the ABS system, at the same time using a drive torque.