Vehicle Yaw Rate Determination Using Handling State Segmentation
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Solution Overview
Problem
Vehicle stability control systems often produce inaccurate determinations of desired yaw plane behavior due to failure to account for multiple vehicle handling states, leading to inappropriate activation of stability control measures.
Innovation Solution
A method and system that determine a desired yaw rate for a vehicle based on its current handling state, using a processor to select the appropriate state, calculate the road wheel angle and velocity, and apply a filter-dependent on the handling state to the desired steady state yaw rate, activating stability control measures when the difference between desired and actual yaw rates exceeds a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single reference model is used to determine desired yaw rate, then the system complexity is reduced, but the measurement precision of desired yaw rate deteriorates for vehicles with multiple handling states
Solution Approach 1:
The patent divides the single reference model into multiple reference models, each corresponding to a specific handling state (e.g., normal mode, performance mode). The system segments the yaw rate determination task by selecting the appropriate reference model based on the current handling state, thereby maintaining measurement precision across different vehicle configurations without excessively increasing system complexity.
Solution Approach 2:
The patent implements a dynamic selection mechanism that adapts the reference model based on the current handling state. The system dynamically switches between different reference models according to real-time vehicle conditions, allowing the desired yaw rate determination to remain accurate across varying operational modes while avoiding the need to maintain all models simultaneously active.
2Measurement precision
If multiple reference models are implemented to account for different handling states, then the measurement precision of desired yaw rate is improved, but the device complexity increases
Solution Approach 1:
The patent pre-establishes multiple reference models corresponding to different handling states before operation. The system prepares these models in advance and selects the appropriate one based on the current state, avoiding the need to dynamically create or switch complex models during operation. This preliminary preparation improves measurement precision while controlling system complexity through structured pre-computation.
3Reliability
If stability control measures are activated based on inaccurate desired yaw rate determination, then vehicle stability is maintained, but the ease of operation deteriorates due to inappropriate activation
Solution Approach 1:
The patent implements a feedback mechanism that compares the actual yaw rate with the desired yaw rate determined from the selected reference model. The system continuously monitors the difference between actual and desired yaw rates and only activates stability control measures when this difference exceeds a threshold, ensuring that control activation is based on accurate real-time comparison rather than inaccurate predetermined values.
Data Source
AI summary
Methods and systems are provided for determining a desired yaw rate for a vehicle. The vehicle has a plurality of handling states and comprises a yaw rate sensor for determining an actual yaw rate. The method comprises selecting one of the plurality of handling states, determining the desired yaw rate for the vehicle based on the road wheel angle, the velocity, and the selected one of the plurality of handling states, and activating one or more vehicle stability control measures if the difference between the desired yaw rate and the actual yaw rate for the vehicle exceeds a predetermined threshold.