Vehicle Speed Estimation via Dynamic Wheel Selection
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Solution Overview
Problem
Current methods for estimating vehicle speed are prone to cumulative errors due to integration of acceleration, and there is no established criterion for selecting wheel speed based on the vehicle's drive method, leading to inaccuracies in speed determination.
Innovation Solution
A vehicle system that includes sensors to obtain wheel speed information and a controller to select the appropriate wheel speed based on the driving state, applying weights to the selected wheel speed information to determine the vehicle's speed, considering factors like friction coefficient and brake pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wheel speed information is selected based on driving state with established criteria, then speed determination accuracy is improved, but device complexity increases
Solution Approach 1:
The controller dynamically selects wheel speed information based on the current driving state (acceleration, deceleration, steady-state conditions). The selection criteria adapt to changing driving conditions, choosing from different wheels (driven wheels during acceleration, non-driven wheels during deceleration) to maintain accuracy without requiring complex hardware modifications
Solution Approach 2:
The control logic segments the driving state into distinct phases (acceleration, deceleration, steady-state) and applies different selection criteria for each phase. This segmentation allows the system to use simple rule-based logic for each phase rather than requiring a single complex decision-making algorithm
2Measurement precision
If wheel speed selection criterion is established based on drive method, then speed estimation accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The controller automatically determines the appropriate wheel speed selection criterion based on the detected driving state without requiring manual intervention. The system self-adjusts by identifying whether the vehicle is accelerating or decelerating and autonomously selects the appropriate wheel speed information, making the complex operation transparent to the user
Data Source
AI summary
A vehicle, and a method of controlling a vehicle, is capable of selecting a wheel speed that is most appropriate to obtain a speed of the vehicle from among wheel speeds of the vehicle to obtain an accurate speed of the vehicle. The vehicle includes a sensor configured to obtain wheel speed information of at least one wheel. The vehicle also includes a controller configured to select wheel speed information from among the wheel speed information of the at least one wheel based on a driving state of the vehicle and configured to determine a speed of the vehicle based on the selected wheel speed information.