Vehicle Motion Control Apparatus for Slow Spin Tendency Detection
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Solution Overview
Problem
Conventional vehicle motion control systems fail to initiate stabilization control early enough when a vehicle experiences a slow spin tendency, as the yaw rate deviation does not exceed the threshold value quickly, leading to instability.
Innovation Solution
A motion control apparatus that includes specific operation determining means, behavior determining means, spin tendency determining means, and stabilization control executing means to detect driver operations and vehicle behaviors indicating spin tendency, allowing for early initiation of stabilization control by adjusting threshold values and monitoring vehicle body slip angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the conventional yaw rate deviation threshold method is used to detect over-steering, then the control system remains simple, but the detection precision is insufficient for slow spin tendency
Solution Approach 1:
The detection system is segmented into multiple independent determination means: specific operation determining means, specific behavior determining means, and spin tendency determining means. Each segment analyzes a specific aspect (driver operation, vehicle behavior, spin tendency) and combines them logically to achieve comprehensive detection without requiring a single complex threshold system.
Solution Approach 2:
The detection approach transitions from a single-dimension yaw rate deviation threshold to a multi-dimensional detection framework considering driver operation patterns, vehicle behavior characteristics, and spin tendency indicators simultaneously. This dimensional expansion enables detection of slow spin tendency that single-threshold methods miss.
2Reliability
If the yaw rate deviation threshold is set high to detect slow spin tendency early, then the detection sensitivity improves, but false detection increases
Solution Approach 1:
The system incorporates feedback loops where the spin tendency determining means continuously monitors vehicle behavior and adjusts detection based on actual vehicle response. The control execution means provides feedback on stabilization actions taken, allowing the system to learn and refine detection accuracy, reducing false positives while maintaining early detection capability.
Solution Approach 2:
The specific operation determining means detects driver operations that are likely to induce spin tendency before the actual spin occurs. By identifying preliminary conditions (driver input patterns, vehicle state), the system prepares for potential spin tendency and can detect it earlier with higher confidence, reducing false detections.
3Stability of the object's composition
If stabilization control is initiated early for slow spin tendency, then the vehicle stability is maintained, but the control activation complexity increases
Solution Approach 1:
The control system dynamically adjusts the threshold values for spin tendency detection based on vehicle operating conditions, speed, and detected behavior patterns. This dynamic adaptation allows early stabilization control activation when needed while avoiding unnecessary control in normal conditions, maintaining vehicle stability without constant complex control activation.
Data Source
AI summary
A motion control apparatus for a vehicle can perform vehicle stability control. The apparatus determines that the vehicle is experiencing spin tendency when it detects a driver's specific operation that induces spin tendency and then detects a specific behavior representing spin tendency of the vehicle, and changes the conditions for initiating the vehicle stability control such that the control is initiated more easily. The specific operation may be an excessive steering operation in the turning direction or a load moving operation which increases the load acting on the front wheels. The specific behavior may be disagreement between behavior of steering angle and behavior of actual yaw rate of the vehicle. Accordingly, the occurrence of relatively slow spin tendency caused by the above “specific operation” can be detected with certainty. Further, upon detection of spin tendency, vehicle stability control is early initiated and executed, whereby stability of the vehicle is maintained.