Adaptive Vehicle Gap Control for Stopped Front-Car Braking
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Solution Overview
Problem
Conventional methods for controlling the distance from a front vehicle fail to ensure a target safety distance due to reliance on acceleration control based on speed error rather than speed and distance errors, especially when the front vehicle is stopped, leading to weakened control and potential safety issues.
Innovation Solution
An apparatus and method for controlling a host vehicle's acceleration based on the traveling conditions, using a receiver to gather information on both vehicles, an acceleration generator to produce first and second accelerations for varying distances, and an output device to apply these accelerations, with distinct controls for when the front vehicle is traveling or stopped.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acceleration control is based on distance error, then the safety distance from the front vehicle is improved, but the control responsiveness to speed changes deteriorates
Solution Approach 1:
The patent combines distance error control and speed error control into a unified acceleration control system. The controller integrates both control strategies, using distance error as the primary control input while incorporating speed error as a secondary input to maintain responsiveness during speed transitions, thereby resolving the contradiction between safety distance reliability and control responsiveness
Solution Approach 2:
The patent dynamically adjusts control parameters based on the front vehicle's state. When the front vehicle is stopped, the controller increases the weight of distance error control to prioritize safety distance maintenance. When the front vehicle is moving, the controller balances distance and speed error control to maintain both safety and responsiveness, effectively changing control parameters to resolve the contradiction under different operating conditions
2Adaptability or versatility
If the target safety distance is varied based on driving speed, then the adaptability to different driving conditions is improved, but the control stability when the front vehicle is stopped deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of the target safety distance based on the front vehicle's state. When the front vehicle is moving, the target distance varies with driving speed to maintain adaptability. When the front vehicle is stopped, the target distance becomes fixed to ensure control stability. This dynamic switching mechanism resolves the contradiction between adaptability and stability by adjusting system behavior according to operating conditions
Data Source
AI summary
An apparatus for controlling a distance from a front vehicle includes a receiver to receive information on a host vehicle and information on the front vehicle, an acceleration generator to generate one of first acceleration for the host vehicle or second acceleration for the host vehicle, based on the received information on the host vehicle and the received information on the front vehicle and an output device to output the generated first acceleration or the generated second acceleration.