Driving Support Apparatus Acceleration Prohibition Logic
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Solution Overview
Problem
Existing driving support systems face challenges in ensuring safe vehicle operation when both speed maintenance and deceleration support conditions are met, as immediate reactivation of speed maintenance after deceleration can lead to unsafe acceleration, especially near low-speed driving points.
Innovation Solution
A driving support apparatus with a controller that prioritizes deceleration support by forbidding acceleration from speed maintenance systems until specific conditions are met, such as driver intervention, passage of a specific point, or elapsed time/distance, to ensure safe vehicle operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the first support is re-started immediately after the second support is completed, then the vehicle speed is quickly restored to the first speed, but the vehicle may accelerate unsafely at the low speed driving point
Solution Approach 1:
The controller performs preliminary action by maintaining the acceleration prohibition state after the second support is completed, before allowing the first support to restart. This ensures the vehicle does not accelerate immediately upon reaching the low speed driving point, prioritizing safety over quick speed restoration.
Solution Approach 2:
The system dynamically adjusts the operational state of the first support based on the completion status of the second support. The acceleration prohibition is maintained during a transition period, creating a dynamic control mechanism that adapts to the vehicle's proximity to the low speed driving point.
2Reliability
If the acceleration of the vehicle is forbidden after the second support is completed, then the vehicle moves safely at the low speed driving point, but the vehicle speed restoration is delayed
Solution Approach 1:
The controller maintains the acceleration prohibition as a preliminary safety measure for a predetermined period after the second support is completed. This preliminary action ensures safety at the low speed driving point before allowing speed restoration, accepting a controlled time delay.
Solution Approach 2:
The system changes the operational parameter of the first support from prohibited to allowed after a predetermined time period. This parameter change balances safety requirements with the need for timely speed restoration, reducing the time loss while maintaining safety.
3Reliability
If both the first support and second support are executed simultaneously, then the vehicle speed control is comprehensive, but the conflict between acceleration and deceleration commands creates control instability
Solution Approach 1:
The controller segments the execution timing of the first support and second support by introducing an acceleration prohibition period. This segmentation separates the deceleration command execution from the acceleration command execution, preventing simultaneous conflicting commands while maintaining comprehensive speed control.
Solution Approach 2:
The system dynamically controls the operational state of the first support based on the execution status of the second support. By making the first support's acceleration command conditional on the second support's completion status, the system maintains control stability while ensuring comprehensive speed management.
Data Source
AI summary
A driving support apparatus (12) performs a second support after forbidding acceleration by a first support, keeps forbidding the acceleration by the first support after the second support is completed and before a predetermined acceleration allowing condition is satisfied, and allows the acceleration by the first support after the acceleration allowing condition is satisfied, if both of an execution condition for the first support and an execution condition for the second support are satisfied.