Vehicle Braking Control Using Pre-Preceding Vehicle Deceleration
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Solution Overview
Problem
Existing vehicle control systems fail to accurately determine when a pre-preceding vehicle is present and require sufficient deceleration, leading to insufficient deceleration in following-travel control and increased collision risk, especially when the timing of steering avoidance is late or relative speeds are high.
Innovation Solution
A vehicle control apparatus that includes a monitoring sensor and brake apparatus, which determines the presence of a pre-preceding vehicle and compares required decelerations for following-travel control and collision-avoidance deceleration control, adjusting the own vehicle's deceleration accordingly to ensure safe avoidance by steering when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle control system only monitors the preceding vehicle and not the pre-preceding vehicle, then the monitoring system remains simple, but the collision risk increases due to insufficient deceleration control
Solution Approach 1:
The monitoring system is segmented into two distinct monitoring paths: one for the preceding vehicle and another for the pre-preceding vehicle. This allows the system to independently evaluate both vehicles and determine the appropriate deceleration control based on which vehicle requires greater attention, thereby improving collision risk management without requiring a complete system redesign.
Solution Approach 2:
The system performs preliminary monitoring of the pre-preceding vehicle in advance of when it might become the primary concern. By continuously evaluating the pre-preceding vehicle's position and speed before a collision risk materializes, the system can prepare appropriate deceleration control measures, ensuring timely response when the pre-preceding vehicle becomes the critical factor.
2Reliability
If the system prioritizes following-travel control for the preceding vehicle, then the following-travel control performance is maintained, but the deceleration control becomes insufficient when the pre-preceding vehicle requires greater deceleration
Solution Approach 1:
The system dynamically changes the control parameter by comparing the required deceleration values for both the preceding vehicle and pre-preceding vehicle. Based on this comparison, the system switches between following-travel control mode and collision-avoidance deceleration control mode, ensuring that the appropriate control strategy is applied based on real-time conditions without requiring complex manual intervention.
Solution Approach 2:
The system implements a feedback mechanism where the required deceleration for both vehicles is continuously calculated and compared. This feedback loop allows the control system to automatically adjust between following-travel control and collision-avoidance deceleration control based on which vehicle presents the greater risk, ensuring sufficient deceleration control while maintaining operational simplicity through automated decision-making.
3Reliability
If the system initiates deceleration control earlier for pre-preceding vehicles, then the collision avoidance capability improves, but the braking force application becomes more complex
Solution Approach 1:
The system initiates deceleration control in advance by monitoring the pre-preceding vehicle before it becomes an immediate collision threat. By calculating the required deceleration early and comparing it with the preceding vehicle's requirements, the system prepares the braking system proactively, improving collision avoidance capability while managing braking control complexity through systematic early evaluation.
Solution Approach 2:
The system manages braking control complexity by dynamically changing the braking parameter based on comparison results. When the pre-preceding vehicle requires greater deceleration, the system switches to applying braking force targeted at that vehicle; otherwise, it maintains following-travel control. This parameter-based approach simplifies the control logic while ensuring appropriate early deceleration when needed.
Data Source
AI summary
A vehicle control apparatus for a vehicle includes a monitoring sensor and a brake apparatus. The vehicle control apparatus determines whether a pre-preceding vehicle is present in front of a preceding vehicle in front of an own vehicle in a vehicle advancing direction. In response to the pre-preceding vehicle is determined to be present in front of the preceding vehicle, the vehicle control apparatus compares a first required deceleration required to cause the own vehicle to travel to follow the preceding vehicle based on a monitoring result of the monitoring sensor and a second required deceleration required to cause the own vehicle to travel to follow the pre-preceding vehicle based on a monitoring result of the monitoring sensor, and controls the brake apparatus to bring deceleration of the own vehicle closer to the second required deceleration in response to the second required deceleration being greater than the first required deceleration.