Autonomous Driving Control With EPB Lock After Minimum Risk Maneuver
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Solution Overview
Problem
Autonomous driving systems face challenges in preventing additional risks after stopping the vehicle, such as the vehicle drifting out of its lane due to user misoperation.
Innovation Solution
An autonomous driving control apparatus that automatically engages an electronic parking brake (EPB) when the vehicle stops after a minimum risk maneuver (MRM), thereby preventing reactivation of the autonomous driving control function until the vehicle is restarted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the autonomous driving control function is deactivated after a minimum risk maneuver, then additional risks from user misoperation are prevented, but the vehicle cannot be restarted until manual intervention occurs
Solution Approach 1:
The system performs preliminary action by automatically engaging the electronic parking brake immediately when the vehicle stops after an MRM, before the user can potentially make a misoperation. This preemptive measure ensures the vehicle is secured in advance, preventing drift or unintended movement while the control function remains deactivated.
Solution Approach 2:
The system applies preliminary anti-action by disabling the autonomous driving control function reactivation until the vehicle is explicitly restarted by the user. This prevents harmful reactivation scenarios where the system might incorrectly interpret post-MRM conditions as safe for autonomous operation, thereby counteracting potential safety risks before they can manifest.
2Reliability
If the electronic parking brake is automatically engaged after stopping, then the vehicle remains stationary and secure, but the system complexity increases
Solution Approach 1:
The autonomous driving control apparatus performs multiple functions: it monitors driving conditions, executes MRMs, manages control authority transfer, and automatically engages the electronic parking brake. By consolidating these functions in a single control system rather than adding separate dedicated devices, the patent achieves enhanced stability without proportionally increasing overall system complexity.
Solution Approach 2:
The patent merges the parking brake engagement function with the autonomous driving control system. Instead of treating these as separate systems, the control apparatus integrates the automatic EPB engagement as part of its MRM execution sequence, thereby achieving improved vehicle stability while avoiding the complexity overhead of a fully independent control system.
3Ease of operation
If the control authority is transferred to the user, then the autonomous driving system can be restarted, but the vehicle may drift due to user error
Solution Approach 1:
The system performs preliminary action by securing the vehicle with the electronic parking brake before control authority is transferred to the user. This ensures that even if the user makes erroneous inputs after taking control, the vehicle remains stationary and cannot drift, thereby eliminating the harmful effect of user error while preserving controllability.
Data Source
AI summary
An autonomous driving control apparatus for a vehicle includes: a processor that determines whether a current driving condition of the vehicle is a limit situation during an autonomous driving control. When the limit situation is determined, the processor demands to transfer a control authority to a user of the vehicle. When the control authority is not transferred to the user, the processor starts a minimum risk maneuver. After the vehicle is stopped after the minimum risk maneuver ends, the processor controls engagement of an electronic parking brake device. The autonomous driving control apparatus further includes a storage configured to store driving condition data of the vehicle and a set of instructions executed by the processor.