Adaptive Variation Rate for Emergency Braking Response
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Solution Overview
Problem
Existing automatic emergency braking systems may fail to promptly adjust deceleration rates in response to sudden changes in the operation target, potentially leading to contact with obstacles due to the time required to reach the increased target deceleration rate.
Innovation Solution
A drive assist apparatus equipped with a detector and a traveling controller that calculates a target deceleration rate and variation rate, determining a contact risk and increasing the variation rate when the risk is high to rapidly adjust the deceleration rate and avoid obstacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the target deceleration rate is increased to avoid contact with obstacles, then the braking force is improved, but the time required to reach the target deceleration rate increases
Solution Approach 1:
The patent applies dynamics by making the variation rate adaptive rather than fixed. The variation rate is dynamically adjusted based on the difference between current and target deceleration rates, allowing the system to optimize the balance between braking force application and response time. This resolves the contradiction by enabling high braking force when needed while minimizing the time to reach target deceleration through optimized rate adjustment.
2Speed
If the variation rate is increased to reduce the time to reach target deceleration rate, then the response speed is improved, but the comfort of the vehicle deteriorates due to abrupt deceleration changes
Solution Approach 1:
The system dynamically adjusts the variation rate based on real-time conditions. When rapid deceleration is needed, the variation rate increases to improve response speed. When conditions allow, the variation rate is reduced to maintain passenger comfort. This dynamic adaptation resolves the contradiction between response speed and comfort by optimizing the variation rate according to the specific situation.
Solution Approach 2:
The patent changes the parameter of variation rate adaptively based on the difference between current and target deceleration rates. By modifying this parameter dynamically, the system achieves both fast response when necessary and comfortable operation when possible, resolving the contradiction between response speed and ease of operation.
3Measurement precision
If the target deceleration rate is calculated based on estimated contact time, then the accuracy of contact avoidance is improved, but the system complexity increases due to additional calculations
Solution Approach 1:
The system uses feedback from the calculated difference between current and target deceleration rates to adjust the variation rate. This feedback mechanism improves contact avoidance accuracy by continuously monitoring and adapting to changing conditions, while the simplicity of the feedback loop helps manage system complexity.
Solution Approach 2:
The patent calculates target deceleration rate based on estimated contact time and uses this parameter to drive the adaptive variation rate adjustment. This approach improves measurement precision for contact avoidance while keeping the computational framework relatively simple through focused parameter optimization.
Data Source
AI summary
A drive assist apparatus includes a detector and a traveling controller. The detector detects an operation target of automatic emergency braking of a vehicle. The traveling controller includes a calculator and a determiner, and controls the automatic emergency braking on the basis of a result of the detection performed by the detector. The calculator calculates each of a target deceleration rate and a variation rate. The target deceleration rate is a target value of a deceleration rate of the automatic emergency braking. The variation rate is a rate of variation in the deceleration rate required for the deceleration rate of the automatic emergency braking to reach the target deceleration rate. The determiner determines a contact risk of the vehicle with the operation target on the basis of the target deceleration rate. The calculator increases the variation rate when the contact risk is determined by the determiner as being relatively high.