Adaptive Cruise Control Using Two-Vehicle Restart Prediction
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Solution Overview
Problem
Existing adaptive cruise control systems in motor vehicles struggle to maintain smooth acceleration and braking when following multiple preceding vehicles, especially in traffic jams, leading to excessive acceleration and sudden braking.
Innovation Solution
A method that calculates a control instruction for the host vehicle based on the dynamics of at least two preceding vehicles, using a virtual equivalent vehicle model to determine a relative distance and speed, allowing the host vehicle to anticipate and synchronize its restart with the first preceding vehicle, thereby avoiding excessive acceleration and maintaining a safe distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the host vehicle bases speed control only on the first third-party vehicle, then the control system is simple, but the host vehicle restarts late and accelerates excessively to catch up
Solution Approach 1:
The system performs preliminary action by detecting the restart intention of the first third-party vehicle through the dynamics of the second third-party vehicle before the first vehicle actually restarts. By monitoring when the second vehicle has restarted and maintaining a time gap, the system predicts when the first vehicle will restart, allowing the host vehicle to prepare and restart simultaneously, avoiding late restart and excessive acceleration.
2Reliability
If the host vehicle accelerates sharply to catch up with the first third-party vehicle, then it can maintain the safety distance, but it causes jerky movements and uncomfortable driving
Solution Approach 1:
The system performs preliminary acceleration preparation by detecting the restart timing of the third-party vehicles in advance. Instead of sharp acceleration to catch up, the host vehicle gradually increases speed starting before the third-party vehicles restart, ensuring smooth acceleration that maintains safety distance without causing jerky movements.
3Device complexity
If the host vehicle follows only the first third-party vehicle, then the sensor requirements are minimal, but the vehicle cannot anticipate restarts in traffic jams
Solution Approach 1:
The system applies multi-functionality by using the existing sensor network to serve dual purposes: monitoring both the first and second third-party vehicles simultaneously. The same sensors that detect the first vehicle's position and speed are also used to detect the second vehicle's dynamics, enabling restart prediction without adding new sensor types, thus maintaining traffic condition adaptability while avoiding increased device complexity.
Data Source
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AI summary
The invention relates to a method for automatically regulating the speed (V0) of a host motor vehicle (10), comprising, when at least two third motor vehicles (11, 12) precede the host motor vehicle in its lane, the steps of: - acquiring at least one piece of data (D1, D2, ΔV1, ΔV2) relating to the dynamics of each third motor vehicle, and - determining a control command for the speed control means of the host motor vehicle. According to the invention, when the two third motor vehicles are initially stationary, with the first third motor vehicle following a second third motor vehicle, and then the second third motor vehicle starting to move, the control command is determined based on at least said at least one piece of data relating to the dynamics of the second third motor vehicle.