Vehicle Control for Driver and Parking Brake Abnormalities
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Solution Overview
Problem
Existing vehicles face safety risks due to potential abnormalities in drivers and electric parking brake devices, particularly in non-shift-by-wire vehicles, where a mechanical transmission prevents electronic control of the shift position, and in shift-by-wire vehicles, where brake device failures can occur, leading to unsafe stop states.
Innovation Solution
A vehicle control device that includes a recognition unit, driving control unit, driver abnormality detection unit, and vehicle abnormality detection unit to manage acceleration, deceleration, and steering, ensuring safe vehicle operation by decelerating to a predetermined speed and allowing creep travel along the current lane when abnormalities are detected, and enabling safe stopping when a preceding vehicle is recognized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake device is continuously operated to maintain vehicle stop state, then the vehicle can remain stationary, but the brake device may fail due to prolonged operation
Solution Approach 1:
The control unit periodically releases and reapplies the brake device in a cyclic manner to maintain vehicle stop state. This periodic action prevents continuous brake operation while keeping the vehicle stationary, thereby reducing brake device wear and failure risk during extended stop periods.
2Ease of operation
If the shift position is electronically changed to P range in shift-by-wire vehicles, then the stop state can be maintained, but brake device failure can still occur
Solution Approach 1:
The control unit acts as an intermediary that monitors the operational status of the brake device during electronic shift-to-P operations. When brake abnormality is detected, the control unit prevents complete reliance on the brake device by implementing periodic release-reapply cycles or switching to alternative braking methods, thereby maintaining stop state while protecting against brake failure.
3Speed
If the vehicle decelerates to zero speed using brake device, then the vehicle stops completely, but prolonged brake operation causes device failure
Solution Approach 1:
During the deceleration process to complete stop, the control unit implements periodic release and reapplication of the brake device. This prevents continuous brake engagement that would lead to failure, while still achieving the goal of bringing the vehicle to a complete stop at zero speed.
Data Source
AI summary
A vehicle control device includes: a recognition unit configured to recognize a surrounding condition of a vehicle; a driving control unit configured to control acceleration, deceleration, and steering of the vehicle based on a recognition result; and a vehicle abnormality detection unit configured to detect an abnormality in an electric parking brake device. When an abnormality in the driver is detected during traveling of the vehicle, the driving control unit performs control to decelerate the vehicle to a predetermined speed greater than zero by braking by a brake device. In a case where an abnormality in the electric parking brake device is detected before or at a time the vehicle is decelerated to the predetermined speed, the driving control unit causes the vehicle to perform traveling along a traveling road until the recognition unit recognizes a preceding vehicle after the vehicle is decelerated to the predetermined speed.