Vehicle Control Interface Box for Electric Parking Brake Release
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Solution Overview
Problem
During autonomous driving, vehicles require precise timing for releasing wheel fixation mechanisms like electric parking brakes to prevent unintended movement, especially on inclines, which existing systems often fail to address effectively.
Innovation Solution
An autonomous driving system communicates with a vehicle control interface box to manage electric parking brakes, releasing them upon acceleration requests or user commands, ensuring timely immobilization or release based on specific command values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the electric parking brake is released immediately when the autonomous driving system is activated, then the vehicle can start moving promptly, but unintended movement may occur on inclines
Solution Approach 1:
The system performs preliminary assessment of acceleration requests and immobility commands before releasing the electric parking brake. The control device checks multiple conditions (acceleration command presence, immobility command status) prior to brake release, ensuring the vehicle is ready for movement without unintended motion on inclines.
Solution Approach 2:
The system continuously monitors acceleration commands from the autonomous driving system and immobility commands to determine the appropriate timing for electric parking brake release. This feedback mechanism ensures the brake is released only when both acceleration is requested and no immobility constraint is active, balancing prompt start with safety.
2Reliability
If the electric parking brake is maintained in activated state, then vehicle stability is ensured on inclines, but the vehicle cannot start moving promptly
Solution Approach 1:
The system dynamically adjusts the electric parking brake state based on real-time conditions. The brake transitions from activated to released state when specific conditions are met (acceleration command present and no immobility command), allowing the system to adapt between stability and movement readiness as needed.
Solution Approach 2:
The system prepares for brake release by continuously monitoring acceleration commands and immobility commands in advance. When the autonomous driving system requests acceleration and no immobility command is active, the system is already prepared to release the brake immediately, eliminating delay between decision and action.
3Speed
If the electric parking brake is released without checking immobility commands, then the vehicle can start moving promptly, but safety control is compromised
Solution Approach 1:
The system implements preliminary checks for immobility commands before releasing the electric parking brake. By verifying that no immobility command is active prior to brake release, the system prevents unintended movement while still enabling prompt vehicle startup when conditions are appropriate.
Solution Approach 2:
The control device continuously receives and processes immobility commands from the autonomous driving system to determine whether brake release is safe. This feedback loop ensures that the electric parking brake is released only when the system confirms no immobility constraint should be active, maintaining safety while enabling timely movement.
Data Source
AI summary
A vehicle equipped with an autonomous driving system includes a vehicle platform configured to execute vehicle control in accordance with commands from the autonomous driving system. The vehicle platform includes a base vehicle including an electric parking brake, and a vehicle control interface box configured to perform interfacing between the autonomous driving system and the base vehicle. An immobility command including one of a first value requesting immobilization of the vehicle, a second value requesting release of the immobilization of the vehicle, and a third value that makes no request, is transmitted from the autonomous driving system to the vehicle control interface box. The vehicle platform is configured to release the electric parking brake when acceleration of the vehicle is requested, in a case where the immobility command including the third value is received and the electric parking brake is in an activated state.