Driving Support Device Communication Failure Handling
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Solution Overview
Problem
Existing driving support devices fail to execute upper limit control when a communication failure occurs, preventing the device from detecting the driver's operation on the switch, leading to potential unsafe vehicle acceleration during reverse maneuvers.
Innovation Solution
A driving support device that automatically sets itself to an allowing state for upper limit control in case of a communication failure, ensuring the control is executed even if the device was in a prohibiting state at the time of failure, and notifies the driver of the state change to minimize driver unease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device sets itself to an allowing state automatically upon communication failure, then the reliability of upper limit control execution is improved, but the driver may experience increased unease due to unexpected state changes
Solution Approach 1:
The notification unit provides feedback to the driver about the state change caused by communication failure, explaining why the upper limit control is being executed. This feedback mechanism reduces driver unease by making the system's behavior transparent and understandable, while maintaining the reliable execution of safety control.
2Ease of operation
If the device requires manual switch operation to change state, then the ease of operation is improved, but the reliability deteriorates when communication failure occurs
Solution Approach 1:
The controller is pre-programmed with automatic state transition logic that activates upon detecting communication failure. This preliminary action ensures that when failure occurs, the system immediately transitions to the allowing state without requiring manual intervention, thereby maintaining reliability while preserving ease of operation under normal conditions.
3Ease of operation
If the device prohibits upper limit control execution in the prohibiting state, then the ease of operation is improved for intentional acceleration, but the safety deteriorates when erroneous operation occurs after communication failure
Solution Approach 1:
The controller dynamically adjusts the upper limit control execution state based on communication status. When communication fails, the system automatically transitions from prohibiting state to allowing state, enabling the upper limit control to execute and prevent excessive acceleration from erroneous operations, while maintaining ease of operation during normal communication conditions.
Data Source
AI summary
A driving support device executes a limit control to control a vehicle in such a manner that an actual acceleration of when the vehicle is being reversed does not exceed a limit acceleration during a time period from a time point that a start condition becomes satisfied to a time point that an end condition becomes satisfied. The driving support device sets a state of itself to either one of a prohibiting state in which an execution of the limit control is prohibited or an allowing state in which the execution of the limit control is allowed. The driving support device sets the state of itself to the allowing state when a failure that the driving support device cannot detect/receive a request signal occurs.