Electromotive Parking Brake Activation Logic for Automated Release
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Solution Overview
Problem
Automated parking brake systems often fail to release the brake when certain conditions are not met due to missing data, leading to the vehicle being undesirably held at a stop, especially in cases of switch malfunctions.
Innovation Solution
The system ensures the parking brake is only activated when all conditions for both activation and deactivation groups are met, with a check for the availability of state values required for deactivation, and if not available, it verifies the functionality of the parking brake switch before activation, allowing for manual release and preventing uncontrolled rolling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parking brake is activated automatically when the ignition is switched off, then the vehicle can be securely parked, but the parking brake cannot be released automatically when conditions for deactivation are not fully met
Solution Approach 1:
The system checks the availability of all state values required for automated deactivation before activating the parking brake. This preliminary verification ensures that when the parking brake is activated, the necessary data (vehicle speed, ignition state, roadway inclination, accelerator pedal state, driver presence, clutch state, parking brake switch state) will be available for automated release, preventing the situation where the brake cannot be released automatically.
2Ease of operation
If the parking brake is activated without checking all deactivation conditions, then the system is simpler to operate, but the vehicle may be undesirably held at a stop due to missing data
Solution Approach 1:
The system continuously monitors the availability of state values required for automated deactivation and uses this feedback to control parking brake activation. The controller checks whether all necessary data (vehicle speed, ignition state, roadway inclination, accelerator pedal state, driver presence, clutch state, parking brake switch state) are available before permitting activation, ensuring that the vehicle can be reliably released when conditions are met.
3Reliability
If the system checks for availability of all state values before activation, then automated release is ensured, but the system complexity increases
Solution Approach 1:
The controller performs multiple functions using a single integrated system: it monitors state values for both activation and deactivation conditions, checks availability of data, controls parking brake activation, and manages warning output. This multi-functionality reduces the need for separate dedicated systems for each function, thereby limiting the increase in overall system complexity while ensuring reliable automated release.
4Ease of operation
If the parking brake switch functionality is verified before activation, then manual release capability is ensured, but the system requires additional verification steps
Solution Approach 1:
The system performs a preliminary check of the parking brake switch functionality before activating the parking brake. This verification ensures that the switch is operational and can be used for manual release if needed. By checking switch functionality in advance, the system guarantees that manual release capability is available while integrating this verification into the existing activation process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures the parking brake can be automatically released when conditions are met, preventing long-term vehicle immobilization and providing a warning when the system is not functioning correctly, ensuring safe operation.
Implementation Method 1
a brake piston of the wheel brake can be displaced both hydraulically and also electromotively in order to generate a braking force
Data Source
AI summary
The disclosure relates to a method for operating at least one parking brake of a motor vehicle, which parking brake can be activated and deactivated in an automated manner, wherein, for the purpose of automated operation of the parking brake, state values of the motor vehicle are monitored and compared with prespecifiable conditions, and wherein the parking brake is activated when a first group of the conditions is met and is deactivated when a second group of the conditions is met. It is provided that the parking brake is activated only when all of the conditions of the second group can be successfully checked for compliance or non-compliance with the respective condition.