ACC Departure Input Holding for Safer Stop-and-Go Restart
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Solution Overview
Problem
In vehicles equipped with adaptive cruise control (ACC), the ACC departure operation is cumbersome due to the need for drivers to wait for a specific inter-vehicle distance to be met before departing, which can be mentally tiring and prone to unintended ACC departures.
Innovation Solution
A driving assistance apparatus and method that includes an ACC-departure-operation accepting section to accept the driver's departure operation and an ACC-departure-operation holding section to hold the accepted operation as an effective instruction for a predetermined period, thereby simplifying the departure process while preventing unintended ACC departures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system requires the inter-vehicle distance to be equal to or more than departure-permission inter-vehicle distance D1 before accepting ACC departure operation, then safety is improved by preventing unintended departures, but the driver's operation becomes cumbersome and mentally tiring
Solution Approach 1:
The system performs preliminary acceptance of the departure operation instruction before the inter-vehicle distance condition is met. The control unit holds the accepted instruction in a pending state, allowing the driver to operate without waiting for distance conditions. This preliminary acceptance resolves the contradiction by decoupling the operation acceptance from the safety condition check.
Solution Approach 2:
The system dynamically adjusts the state of the departure operation based on inter-vehicle distance. When distance is sufficient, the held instruction is executed; when distance is insufficient, the instruction is canceled. This dynamic state transition allows flexible handling of the safety-operability contradiction.
2Reliability
If the driver must wait for inter-vehicle distance to become equal to or more than D1 before performing ACC departure operation, then unintended departures are prevented, but time is lost and operation efficiency decreases
Solution Approach 1:
The system accepts and holds the departure operation instruction in advance before the distance condition is satisfied. This preliminary acceptance eliminates the waiting time for the driver while maintaining safety through subsequent conditional execution or cancellation based on real-time distance monitoring.
Solution Approach 2:
The system continuously monitors inter-vehicle distance and provides feedback to determine whether to execute or cancel the held departure instruction. This feedback mechanism ensures safety while allowing rapid response when conditions are met, reducing overall departure time.
3Ease of operation
If the ACC departure operation is accepted when inter-vehicle distance is smaller than D1, then operation simplicity is improved, but the risk of unintended ACC departure increases
Solution Approach 1:
The system separates operation acceptance from execution by holding the instruction in a pending state. This allows simple acceptance regardless of distance, while safety is maintained through conditional execution only when distance conditions are satisfied, or cancellation when they are not.
Solution Approach 2:
The held departure instruction acts as an intermediary state between driver input and system execution. It allows the operation to be accepted simply while introducing a safety checkpoint before actual departure, mediating between operational simplicity and safety.
Data Source
AI summary
This driving assistance device comprises: an ACC starting operation reception unit that receives an ACC starting operation by a driver of a vehicle when the vehicle is stationary; and an ACC starting operation retention unit that retains the ACC starting operation received by the ACC starting operation reception unit as a valid instruction for a predetermined period after the ACC starting operation, and that cancels the ACC starting operation after a lapse of the predetermined period.