Autonomous Speed Control Threshold Switching for Brake-Suppressed Driving
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Solution Overview
Problem
The autonomous driving system's followability of actual speed with respect to target speed is compromised due to frequent braking, leading to unnecessary notifications for the driver, as the existing techniques fail to optimize notification frequency effectively.
Innovation Solution
The system switches between two control modes: one where the brake is actively used for high follow-up performance and another where brake use is suppressed to prevent brake fade, with corresponding adjustments in threshold values to minimize unnecessary notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the brake is actively used to improve speed followability, then the actual speed follows the target speed more accurately, but the brake fade state occurs and unnecessary notifications are generated
Solution Approach 1:
The notification threshold is dynamically adjusted based on the control mode. In the first control mode (active braking), a first threshold is used, while in the second control mode (brake suppression), a second threshold larger than the first is used. This dynamic adjustment prevents unnecessary notifications during brake suppression while maintaining appropriate notifications during active braking.
Solution Approach 2:
The notification threshold parameter is changed according to the control mode. The threshold value is modified based on the braking condition to distinguish between temporary speed errors during brake suppression and actual malfunctions, thereby optimizing notification frequency and reducing driver annoyance.
2Reliability
If the notification threshold is lowered to detect all speed deviations, then all malfunctions are detected, but unnecessary notifications increase and annoy the driver
Solution Approach 1:
The notification threshold is dynamically adjusted based on the control mode. In the first control mode (active braking), a first threshold is used, while in the second control mode (brake suppression), a second threshold larger than the first is used. This dynamic adjustment prevents unnecessary notifications during brake suppression while maintaining appropriate notifications during active braking.
Solution Approach 2:
The notification threshold parameter is changed according to the control mode. The threshold value is modified based on the braking condition to distinguish between temporary speed errors during brake suppression and actual malfunctions, thereby optimizing notification frequency and reducing driver annoyance.
3Ease of operation
If the notification threshold is raised to reduce notifications, then driver annoyance is reduced, but malfunctions may be overlooked
Solution Approach 1:
The notification threshold is dynamically adjusted based on the control mode. In the first control mode (active braking), a first threshold is used, while in the second control mode (brake suppression), a second threshold larger than the first is used. This dynamic adjustment prevents unnecessary notifications during brake suppression while maintaining appropriate notifications during active braking.
Solution Approach 2:
The notification threshold parameter is changed according to the control mode. The threshold value is modified based on the braking condition to distinguish between temporary speed errors during brake suppression and actual malfunctions, thereby optimizing notification frequency and reducing driver annoyance.
Data Source
AI summary
A control mode of speed control includes a first control mode in which an actual speed is caused to follow a target speed through active use of a brake and a second control mode in which the actual speed is caused to follow the target speed while use of the brake is suppressed. An autonomous driving system changes a threshold value to a value larger than a value in the first control mode when the control mode is switched from the first control mode to the second control mode, and changes the threshold value to a value smaller than a value in the second control mode when the control mode is switched from the second control mode to the first control mode.