Vehicle Speed Control Suppressing Brake Force Without Rear Radar
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle speed control systems rely on rear radar sensors to calculate brake forces, increasing costs and risking collisions with following vehicles due to potential sensor failures or abnormalities during automatic brake control.
Innovation Solution
A vehicle speed control apparatus determines whether to suppress brake force based on automatic brake duration time and vehicle speed reduction amount, eliminating the need for rear radar sensors by using forward radar and image sensors to assess collision risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rear radar sensor is added to calculate brake forces for automatic brake control, then the safety regarding following vehicles is improved, but the system cost and complexity increase
Solution Approach 1:
The patent extracts the brake force calculation function from the rear radar sensor requirement and relocates it to the existing forward radar sensor and image sensor system. By processing forward sensor data to infer following vehicle conditions and calculating brake forces without dedicated rear sensors, the system eliminates unnecessary components while maintaining safety functionality.
Solution Approach 2:
The forward radar sensor and image sensor are made multi-functional by using them not only for detecting preceding vehicles but also for inferring following vehicle conditions and calculating appropriate brake forces. This universal utilization of existing sensors eliminates the need for separate rear radar sensors, reducing system complexity while maintaining comprehensive safety coverage.
2Reliability
If the automatic brake control generates a great brake force to ensure safety, then the collision prevention with preceding vehicles is improved, but the risk of collision with following vehicles increases
Solution Approach 1:
The brake force is made dynamic and adaptive rather than fixed. The system continuously adjusts brake force magnitude based on real-time analysis of forward sensor data, automatically modulating between gentle and strong braking depending on the detected situation. This dynamic adjustment prevents excessive brake force application that could endanger following vehicles while maintaining adequate braking when needed.
Solution Approach 2:
The system changes the brake force parameter based on inferred following vehicle conditions. By analyzing forward radar and image sensor data to estimate the presence and state of following vehicles, the system adjusts the brake force parameter dynamically - reducing it when following vehicles are detected and maintaining higher values when safe, thus resolving the contradiction between collision prevention and following vehicle safety.
3Reliability
If the automatic brake control applies strong braking to prevent collision, then the safety is improved, but the vehicle speed reduction amount becomes excessive causing following vehicle collision risk
Solution Approach 1:
The system implements feedback control by continuously monitoring vehicle speed, deceleration rate, and inferred following vehicle conditions during automatic brake control. Based on this feedback, the system adjusts the brake force in real-time to maintain speed reduction within safe limits that prevent following vehicle collisions while still achieving collision avoidance with preceding vehicles.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A vehicle speed control apparatus is configured to determine, based on an automatic brake duration time and a vehicle speed reduction amount, whether to suppress a brake force due to an automatic brake control, the automatic brake duration time being from an automatic brake control starting timing to a current time point, the vehicle speed reduction amount corresponding to a value obtained by subtracting a vehicle speed at the current time point from the vehicle speed at the automatic brake control starting timing.