ACC Resume Control From Brake Release at Vehicle Stop
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Solution Overview
Problem
In vehicles without an electric parking brake (EPB), the ACC is typically disabled during stops, requiring drivers to manually adjust speed and switch settings, leading to inconvenience and potential safety risks.
Innovation Solution
A driving assistance device that detects brake pedal release and assistance requests to automatically start or resume adaptive cruise control (ACC) without needing accelerator operations, including a control unit, detection, and reception units to facilitate early initiation of travel control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ACC is disabled during vehicle stop in EPB-non-installed vehicles, then safety is secured, but operational convenience deteriorates as drivers must manually adjust speed and switch settings
Solution Approach 1:
The system performs preliminary detection of brake pedal release and assistance requests while the vehicle is stopped, preparing to activate ACC before the vehicle actually moves. This allows the ACC to be ready to engage immediately when the driver releases the brake, eliminating the need for manual accelerator operations and switch adjustments during the transition from stop to motion.
2Ease of operation
If ACC is enabled during vehicle stop in EPB-non-installed vehicles, then operational convenience improves, but safety deteriorates due to insufficient braking force
Solution Approach 1:
The system applies preliminary anti-action by detecting the driver's intention to move (brake release + assistance request) while the vehicle is still stopped, and only then activating ACC. This prevents premature ACC activation that would compromise safety, while still providing the convenience of automated control as soon as the driver indicates readiness to move.
Solution Approach 2:
The system uses feedback from multiple sensors (brake pedal position, accelerator pedal position, vehicle speed) to continuously monitor the vehicle state and driver intentions. This feedback mechanism ensures ACC is activated at the optimal moment - when the driver releases the brake and requests assistance - thereby maintaining safety while improving operational convenience.
3Reliability
If driver performs manual operations from stop state to start ACC, then safety is maintained through manual control, but time consumption increases due to multiple steps required
Solution Approach 1:
The system performs preliminary detection and preparation of ACC activation while the vehicle is stopped, so that when the driver releases the brake pedal and requests assistance, the ACC is already ready to engage immediately. This eliminates the time-consuming sequence of manual accelerator operations and switch adjustments, reducing the transition time from stop to ACC-controlled motion while maintaining safety through controlled activation conditions.
Data Source
AI summary
To increase convenience of an operation performed from a vehicle stop state until ACC is started or resumed, provided is a driving assistance device for a vehicle, including: a control unit (11) configured to execute travel control of at least one of constant-speed travel control or follow-up travel control, and to stop the travel control during stop of the own vehicle (100); a detection unit (43, 13) configured to detect release of a brake pedal by an occupant of the own vehicle (100); and a reception unit (60, 13) configured to receive an assistance request from the occupant. The control unit (11) is configured to execute one of start or resumption of the travel control when the detection unit (43, 13) detects the release of the brake pedal and the reception unit (60, 13) receives the assistance request during the stop of the own vehicle (100).