Vehicle Slip Control Torque Inversion Detection
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Solution Overview
Problem
Existing vehicle slip control systems face challenges in accurately determining wheel slip due to temporary drastic changes in angular acceleration, leading to potential erroneous slip determinations and delayed torque control responses.
Innovation Solution
A vehicle slip control apparatus that includes a rotating speed detector and a processor to detect angular acceleration and prohibit slip determination until a predetermined time elapses after a torque direction inversion, allowing for precise differentiation between mechanical factors and actual wheel slip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If slip determination is performed based on angular acceleration threshold, then slip detection capability is improved, but erroneous determination occurs during torque inversion
Solution Approach 1:
The system performs preliminary detection of torque direction inversion and proactively prohibits slip determination during the inversion period. By anticipating the erroneous determination that would occur during torque inversion, the system prevents the problem before it happens, maintaining reliable slip detection without false positives during torque direction changes.
2Reliability
If slip determination prohibition is applied until angular acceleration returns to threshold, then erroneous determination is prevented, but response time is delayed
Solution Approach 1:
The system changes the prohibition criterion from angular acceleration threshold-based to torque direction inversion-based. This parameter change allows the prohibition period to be precisely controlled and ended as soon as torque inversion completes, rather than waiting for angular acceleration to return to threshold, thereby minimizing the loss of time while maintaining determination reliability.
3Reliability
If restriction prohibition time is set, then erroneous slip determination is prevented, but torque control response is delayed
Solution Approach 1:
The system dynamically adjusts the slip determination prohibition based on real-time torque direction inversion detection. Rather than using a fixed restriction prohibition time, the prohibition is actively managed and lifted immediately when torque inversion is detected, optimizing the balance between preventing erroneous determination and maintaining rapid torque control response for actual slip conditions.
Data Source
AI summary
A vehicle slip control apparatus to be installed in a vehicle including a drive source configured to output power to a driving wheel of the vehicle and a gear pair interposed between an output shaft of the drive source and the driving wheel includes a rotating speed detector, a slip determination unit, and a slip determination prohibition unit. The rotating speed detector is configured to detect a rotating speed of the output shaft. The slip determination unit is configured to determine, when an absolute value of an angular acceleration of the rotating speed detected by the rotating speed detector exceeds a set threshold, that the driving wheel is in a slip state. The slip determination prohibition unit is configured to prohibit the determination by the slip determination unit until a predetermined time elapses after a direction of torque outputted from the drive source is inverted.