Drum Parking Brake Control Using Adaptive Switch-Off Current
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Solution Overview
Problem
Existing methods for activating a parking brake function in vehicle brake systems often result in increased load on components due to the assumption of a maximum loss of force, which is not always present, leading to higher energy consumption and reduced service life.
Innovation Solution
A method that calculates a switch-off current based on specific signals related to the vehicle's parking situation, such as slope gradient, direction of travel, and hydraulic pressure, to reduce the load on parking brake units and other components by adjusting the current used to maintain the parking brake function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a maximum loss of force is kept as an offset to reliably ensure the required slope holding moment, then the reliability of the parking brake function is improved, but the energy consumption and operating time of the electric parking brake increase
Solution Approach 1:
The patent applies dynamics by making the switch-off current adaptive rather than fixed. The control device dynamically adjusts the switch-off current based on actual operating conditions (slope angle, direction of travel, hydraulic pressure) instead of always using a maximum offset value. This allows the system to maintain reliability when needed while reducing energy consumption when the maximum offset is not required.
Solution Approach 2:
The patent changes the parameter of switch-off current based on different operating conditions. By calculating different switch-off current values according to slope angle, direction of travel, and hydraulic pressure conditions, the system optimizes the balance between reliability and energy consumption. The switch-off current is adjusted as a variable parameter rather than a constant maximum value.
2Reliability
If a maximum loss of force is kept as an offset to reliably ensure the required slope holding moment, then the reliability of the parking brake function is improved, but the load on actuators and components increases over service life
Solution Approach 1:
The system dynamically adjusts the load on actuators by calculating context-appropriate switch-off current values. Instead of continuously applying maximum force offsets, the control device adapts the current level to actual parking conditions, reducing unnecessary stress on actuators and brake components while maintaining sufficient holding capability for each specific situation.
Solution Approach 2:
The patent varies the electrical parameter (switch-off current) based on operating conditions to optimize component loading. By adjusting the current parameter according to slope, direction, and hydraulic pressure, the system prevents excessive and unnecessary loading on actuators and mechanical components, thereby extending their service life while maintaining parking brake reliability.
3Ease of operation
If a fixed switch-off current is used for activating the parking brake, then the ease of operation is improved, but the adaptability to different parking situations deteriorates
Solution Approach 1:
The control device uses feedback from sensors detecting slope angle, direction of travel, and hydraulic pressure to automatically adjust the switch-off current. This feedback mechanism allows the system to adapt to different parking situations without requiring manual intervention from the driver, maintaining ease of operation while achieving high adaptability through automatic parameter adjustment based on real-time conditions.
Solution Approach 2:
The parking brake system performs self-adjustment by automatically calculating and applying the appropriate switch-off current based on detected parking conditions. The system serves itself by using sensor data to determine the optimal current level without driver input, combining ease of operation with adaptability to various parking scenarios through autonomous decision-making.
Data Source
AI summary
A method for activating a parking brake function of a drum brake of a brake system of a vehicle, wherein a parking situation is taken into account in order to reduce the holding force to be exerted.