Automated Parking Brake Intermediate Position Activation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing automated parking brake systems for motor vehicles with hydraulic operating brakes require significant time to engage and disengage, leading to delayed feedback for drivers, especially when transitioning from hydraulic to mechanical holding, which can result in vehicle instability on slopes and delayed safety responses.
Innovation Solution
A method that determines a parking variable to activate the parking brake into an intermediate position between disengaged and engaged states, reducing the time required for subsequent clamping and enhancing feedback and safety by pre-activating the brake based on recognized parking situations using geographic, sensor, and vehicle data analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the parking brake is activated directly from the disengaged position to the engaged position, then the braking force is applied quickly, but the activation time is long (1 to 1.5 seconds) due to the need to overcome free travel and air gap
Solution Approach 1:
The parking brake actuator is activated in advance to move the brake components into an intermediate position before actual parking is required. This preliminary action reduces the free travel and air gap that would otherwise need to be overcome during full activation, thereby significantly reducing the activation time when parking is actually needed while maintaining the necessary braking force application speed
2Loss of time
If the parking brake is pre-activated to an intermediate position, then the subsequent activation time is reduced, but the brake produces no braking effect or significantly lower braking effect during the intermediate state
Solution Approach 1:
The system performs a preliminary activation of the parking brake to move components into an intermediate position that reduces free travel and air gap, accepting that minimal or no braking force is produced during this intermediate state. When actual parking is required, the brake is then fully activated to produce the necessary holding force, achieving fast response time while maintaining adequate braking force when needed
3Ease of operation
If the parking brake activation sequence is optimized for speed, then the driver receives faster feedback, but the system complexity increases due to the need to manage intermediate positions and transition states
Solution Approach 1:
The control unit is configured to automatically manage the preliminary activation sequence, transitioning the parking brake to an intermediate position when parking is anticipated. This automated control handles the complexity of managing intermediate states and transitions, providing fast driver feedback without requiring the driver to understand or manage the complex activation sequence
Solution Approach 2:
The system incorporates feedback mechanisms that monitor the parking brake's position and state, allowing the control unit to adjust the activation sequence accordingly. This feedback ensures that the complex intermediate position management is handled automatically, providing fast and reliable driver feedback while managing system complexity through closed-loop control
Data Source
AI summary
A method is disclosed for the operation of an automated parking brake of a motor vehicle with a hydraulic operating brake and an automated parking brake. The parking brake can adopt at least a disengaged position, an engaged position, and an intermediate position between the disengaged position and the engaged position. The method includes determining a parking variable representing a parking process of the motor vehicle, and bringing the parking brake into the intermediate position in response to the determined parking variable.