Vehicle Roll Back Suppression Control Logic
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Solution Overview
Problem
Existing driving support systems fail to ensure a vehicle stops reliably when roll back occurs, particularly on slopes, as they terminate roll back suppression control during acceleration operations, leading to potential collisions with following vehicles.
Innovation Solution
A driving support system that includes a roll back detection device, a stop-state detection device, and a driving support control device, which continues roll back suppression control by generating driving or braking forces until the vehicle stops, even during driver acceleration, and determines driver intentions to maintain or change the vehicle's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driving control device terminates roll back suppression control when an acceleration operation is performed, then the driver's acceleration request is responded to, but the vehicle may not stop reliably and roll back continues
Solution Approach 1:
The control system dynamically adjusts its behavior based on the detected driver's intention. When roll back is detected, the system maintains suppression control regardless of acceleration operations. After the vehicle stops, the system evaluates the acceleration operation to determine driver intention, and only then terminates the suppression control if the driver intends to accelerate. This dynamic adaptation resolves the contradiction by making the control duration flexible rather than fixed.
Solution Approach 2:
The system uses feedback from the acceleration operation detection to determine driver intention after the vehicle has stopped. The control device continues roll back suppression control until it receives feedback indicating the driver's intention to accelerate, at which point it terminates the suppression. This feedback mechanism ensures reliable stopping while eventually responding to the driver's acceleration request.
2Reliability
If the roll back suppression control is continued until the vehicle stops, then the vehicle stops reliably, but the control duration is extended beyond what is necessary for normal acceleration
Solution Approach 1:
The control duration is made dynamic rather than fixed. The system extends the control duration only as long as necessary to ensure reliable stopping during roll back events. Once the vehicle stops and the system determines through acceleration operation detection that the driver intends to accelerate, the control is terminated immediately. This dynamic adjustment ensures the control lasts exactly as long as needed for safety without unnecessary extension.
Solution Approach 2:
The system takes preliminary action by detecting the driver's acceleration operation during the suppression control execution. This preliminary detection allows the system to prepare for termination of the suppression control once the vehicle stops, ensuring that the control is extended only for the minimum necessary duration to ensure safety while being ready to respond to the driver's intention.
3Ease of operation
If the motor torque according to the acceleration operation is generated after terminating roll back suppression control, then the acceleration request is fulfilled, but the vehicle may collide with following vehicles if the torque is insufficient
Solution Approach 1:
The system applies preliminary anti-action by maintaining the roll back suppression control throughout the entire stopping process, even when acceleration operations are detected. This preliminary continuous control prevents the harmful effect of insufficient torque by ensuring the suppression control remains active until the vehicle actually stops, thereby preventing collision with following vehicles while still allowing the driver's acceleration request to be fulfilled after stopping.
Data Source
AI summary
A driving support system installed on a vehicle includes: a roll back detection device configured to detect roll back of the vehicle; a stop-state detection device configured to detect stopping of the vehicle; a driving operation detection device configured to detect a driving operation performed by a driver of the vehicle; and a driving support control device configured to execute driving support control. The driving support control includes roll back suppression control that generates at least one of a driving force and a braking force to stop the vehicle when the roll back is detected. The driving support control device continues the roll back suppression control at least until the vehicle stops, even when the driving operation is performed during execution of the roll back suppression control.