Self-Driving Vehicle Lateral Dynamics Checks for Route Deviation Control
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Solution Overview
Problem
Existing self-driving vehicles lack effective methods to ensure safe and efficient lateral dynamics control along a predetermined route, leading to potential deviations and unsafe operating conditions.
Innovation Solution
A method that specifies lateral dynamics requirements, communicates them to a steering control device, checks against predefined criteria, and issues a brake command if necessary to maintain safe operation, thereby preventing deviations from the predetermined route.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle uses a predetermined steering limit for lateral control, then the steering system is simple to implement, but the vehicle may deviate from the predetermined route under unstable road conditions
Solution Approach 1:
The patent implements dynamic adjustment of steering limits based on real-time vehicle state and road conditions. The steering angle limit is no longer fixed but adapts according to vehicle speed, lateral acceleration, and other dynamic parameters, allowing the system to maintain reliability while avoiding unnecessary complexity of multiple fixed limit sets
Solution Approach 2:
The patent changes the steering control parameter from a fixed limit to a dynamically calculated limit based on vehicle operating conditions. By modifying the limit parameter according to vehicle speed and lateral dynamics, the system achieves adaptive control that prevents route deviation without requiring complex additional hardware
2Speed
If the vehicle applies extreme steering corrections to return to the route, then the vehicle can quickly correct deviations, but the correction may cause vehicle instability or leave the road
Solution Approach 1:
The patent applies preliminary anti-action by dynamically adjusting the steering limit before extreme corrections are needed. By setting appropriate steering angle limits based on current vehicle state, the system prevents deviations from becoming severe, thereby avoiding the need for unstable extreme corrections while maintaining quick response capability
Solution Approach 2:
The patent implements beforehand cushioning by using dynamic steering limits to cushion against potential extreme corrections. The system prepares appropriate steering constraints in advance based on predicted vehicle behavior, preventing situations where extreme corrections would be necessary and thus maintaining vehicle stability
3Adaptability or versatility
If the vehicle uses a fixed safety limit for position deviation, then the control logic is simple, but the vehicle cannot adapt to varying road conditions and may leave the drivable area
Solution Approach 1:
The patent transforms the fixed safety limit into a dynamic parameter that adapts to varying road conditions through real-time calculation based on vehicle state. This dynamic approach provides adaptability to different driving scenarios without requiring complex rule-based control logic for each condition
Solution Approach 2:
The patent achieves universality by using a unified dynamic limit calculation method that works across various road conditions and vehicle states. Rather than implementing separate control logic for different scenarios, the system uses a generalizable dynamic adjustment mechanism that adapts to any condition, reducing overall system complexity
Data Source
AI summary
A method for operating a self-driving vehicle is provided. The method includes specifying a lateral dynamics requirement for controlling the lateral dynamics of the self-driving vehicle along a route. The lateral dynamics requirement is communicated to a steering control device for controlling steering kinematics of the self-driving vehicle. The method checks whether the communicated lateral dynamics requirement satisfies a lateral dynamics criterion for the operation of the self-driving vehicle, and communicates a brake command to stop the self-driving vehicle depending on a checking result resulting from the checking step.