Lateral Motion Control Degeneration for Vehicle Stability
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Solution Overview
Problem
Existing lateral motion control systems for vehicles face instability and driver discomfort when multiple actuators interfere with each other, particularly during override situations or when actuators cannot function cooperatively.
Innovation Solution
A lateral motion control apparatus that includes a target value obtaining unit, control amount calculation unit, control target control unit, control stop determination unit, and degeneration control amount determination unit, which calculates and controls lateral motion control amounts for multiple actuators to ensure stable vehicle behavior and reduce driver discomfort by gradually degrading control amounts when stopping the actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple control targets (actuators) are controlled cooperatively to achieve integrated lateral motion control, then the control effectiveness and responsiveness are improved, but the risk of interference between actuators increases causing vehicle behavior instability
Solution Approach 1:
The control stop determination unit continuously monitors the operational status of multiple actuators and detects interference conditions in real-time. When interference is detected between actuators (such as front steering and rear steering acting simultaneously), the system automatically stops the conflicting control targets while maintaining others, preventing vehicle behavior instability and ensuring safe operation
Solution Approach 2:
The system dynamically adjusts the number of active control targets based on real-time actuator status. Instead of maintaining a fixed number of controlled actuators, the control stop determination unit selectively activates or deactivates specific control targets depending on whether interference conditions exist, allowing the system to adapt its control configuration for optimal stability and effectiveness
2Reliability
If control of multiple actuators is stopped immediately when interference is detected, then the vehicle behavior stability is improved, but driver discomfort increases due to abrupt control changes
Solution Approach 1:
The control stop determination unit performs preliminary detection of actuator interference conditions before they can cause significant vehicle behavior deviations. By detecting potential interference early and proactively stopping conflicting actuators, the system prevents instability while allowing smooth, gradual control transitions that minimize driver discomfort
Solution Approach 2:
The system applies preliminary anti-action by predicting potential actuator interference and preemptively stopping conflicting control targets before they can create harmful vehicle behavior or driver discomfort. This preventive approach allows for controlled, gradual deactivation rather than abrupt stopping
Data Source
AI summary
The lateral motion control apparatus calculates lateral motion control amounts for a plurality of control targets that operate cooperatively in order to change the lateral motion amount of the vehicle based on a target value for the lateral motion amount of the vehicle, and control the plurality of control targets based on the calculated lateral motion control amounts. Meanwhile, it is determined whether or not the control of the plurality of control targets is to be stopped. When it has been determined that the control of the plurality of control targets is to be stopped, lateral motion degeneration control amounts are determined for each of the plurality of control targets so that the lateral motion control amounts of the plurality of control targets degenerate starting at that time, and the plurality of control targets are controlled based on the determined lateral motion degeneration control amounts.