Vehicle Stop Holding Control for Brake Takeover Timing
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Solution Overview
Problem
Existing vehicle stop holding devices may fail to maintain a reliable stop holding state when the hydraulic brake reaches its limit after the driver gets off without performing a brake operation.
Innovation Solution
A vehicle stop holding device with a controller that executes takeover control by changing the braking force in specific patterns to ensure the brake operation is taken over by the driver, either immediately after detecting the driver's getting-off operation or after a grace time has elapsed if the getting-off operation is not detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hydraulic brake is used to hold the vehicle stop after the driver gets off without performing brake operation, then the stop holding state is maintained initially, but the stop holding state cannot be maintained when the hydraulic brake reaches its limit
Solution Approach 1:
The system performs preliminary detection of driver getting-off operations and proactively executes takeover control before the hydraulic brake reaches its limit. The controller detects when the driver has left the seat and automatically transitions brake operation from manual to automated holding control, preventing the situation where the hydraulic brake would be overwhelmed.
Solution Approach 2:
The system continuously monitors brake operation status and driver presence through seat sensors. When the driver's absence is detected, the system provides feedback control by automatically adjusting brake application to maintain stop holding, creating a closed-loop system that adapts to driver absence conditions.
2Speed
If the takeover control is executed immediately when driver getting-off is detected, then the brake operation is taken over quickly, but the driver may not have sufficient time to respond if they intend to operate the brake
Solution Approach 1:
The system dynamically adjusts the timing of takeover control execution based on detected driver intentions. When accelerator or brake operations are detected after the driver leaves the seat, the system delays takeover control to allow driver response. When no such operations are detected within a predetermined time, the system executes takeover control, creating a dynamic timing mechanism that adapts to driver behavior.
3Reliability
If the brake operation is taken over automatically without driver detection, then the stop holding state is maintained reliably, but the driver's intended brake operation may be interrupted
Solution Approach 1:
The system performs preliminary detection of driver getting-off operations through seat sensors before executing automatic takeover control. By detecting driver absence in advance and monitoring for subsequent accelerator or brake operations, the system prevents unintended interruptions of driver-intended brake operations while maintaining reliable stop holding when the driver has truly left the vehicle.
Data Source
AI summary
The vehicle stop holding device that holds the stop of the vehicle and includes an ECU. The ECU configured to execute takeover control for taking over the operation of a brake device to a driver after the ECU stops the vehicle by the brake device in case where it is determined that the backup control for holding the stop state of the vehicle by a brake holding device cannot be realized and the getting-off operation by the driver is detected, and to execute takeover control after the ECU stops the vehicle by the brake device when a grace time required for the takeover control elapses from a reference time after a determination in case where it is determined that the backup control for holding the stop state of the vehicle by the brake holding device cannot be realized and the getting-off operation by the driver is not detected.