Vehicle Control System Using Phase-Based Deceleration Reflection
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Solution Overview
Problem
Existing automated driving systems face challenges in balancing driving safety and efficiency, particularly when the information on the state of potential obstacles is uncertain, leading to potential inefficiencies and safety concerns.
Innovation Solution
A vehicle control system that utilizes an acquiring device to gather driving environment information and a controller to execute automated driving control by setting a target deceleration based on a deceleration feature, which includes multiple phases, allowing for flexible reflection of the safest deceleration value according to the accuracy of the information and the phase it belongs to, ensuring compatibility between safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the system executes vehicle control only after detecting an obstacle, then driving efficiency is improved, but driving safety deteriorates when obstacle information is uncertain
Solution Approach 1:
The system executes preliminary vehicle control actions based on suspected obstacles before formal detection is complete. The control execution unit can operate based on obstacle suspicion information from the suspicion determination unit, allowing the vehicle to begin safety maneuvers before the obstacle is fully confirmed, thus balancing efficiency with safety
Solution Approach 2:
The system dynamically adjusts the threshold for obstacle suspicion and control execution based on driving conditions. The suspicion determination unit evaluates multiple factors (detection confidence, relative speed, distance) to dynamically determine when to trigger control actions, making the system adaptable to uncertain situations rather than rigidly waiting for full detection
2Reliability
If the system executes vehicle control when obstacle information is uncertain, then driving safety is improved, but driving efficiency deteriorates
Solution Approach 1:
The system changes key parameters (suspicion threshold, control reflection degree) based on the uncertainty level of obstacle information. When information is uncertain but suspicion is high, the system adjusts the reflection degree of suspected obstacle influence on control, allowing flexible balancing of safety and efficiency based on the specific parameter state rather than binary decision-making
3Measurement precision
If the system waits for certain obstacle detection before control, then false control operations are reduced, but response time to actual obstacles increases
Solution Approach 1:
The suspicion determination unit performs preliminary evaluation of obstacle likelihood before formal detection confirmation. This preliminary action allows the system to prepare control responses in advance based on suspicious patterns, reducing the time lag between actual obstacle presence and control activation while maintaining accuracy through subsequent confirmation
Solution Approach 2:
The system implements feedback loops where the results of preliminary suspicion determination inform subsequent detection and control decisions. The control execution unit receives feedback from both the suspicion determination unit and the detection unit, allowing continuous refinement of control actions based on evolving information, thus reducing overall response time while maintaining accuracy
Data Source
AI summary
Setting processing of a target acceleration is executed based on a deceleration feature. In the deceleration feature, a relationship between deceleration and a state of a slowdown target of a vehicle is defined. In the deceleration feature, the state is divided into multiple phases by a predetermined boundary deceleration. In the setting processing, at least one deceleration corresponding to the state is specified. Also, a plausibility indicating an accuracy of information on the state or the accuracy of information associated with the state is calculated for each of the at least one deceleration. Further, a minimum value of the at least one deceleration is specified. Based on a phase to which the minimum value belongs in the deceleration feature and a minimum value plausibility indicating a plausibility corresponding to the minimum value, the minimum value is reflected to a target acceleration in a reflection degree of 0 to 100%.