Drum Parking Brake Shutdown Current for Slope Holding Load Reduction
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Solution Overview
Problem
Existing parking brake systems face increased energy consumption and component load due to maintaining a maximum force loss to ensure slope holding torque, which is not always necessary, leading to inefficiencies and potential overloading.
Innovation Solution
A method for activating the parking brake function in a drum brake system that determines a shutdown current based on various vehicle-specific signals, such as slope, direction of travel, hydraulic pressure, and brake shoe conditions, allowing for reduced load on components by adjusting the shutdown current according to the specific parking situation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a maximum force loss is maintained as an offset to ensure the required slope holding torque, then the reliability of slope holding is improved, but the energy consumption and actuation time of the electric parking brake increase
Solution Approach 1:
The patent implements dynamic adjustment of the shutdown current based on real-time detection of parking situations (slope angle, direction of travel, hydraulic pressure, brake shoe conditions). Instead of using a fixed maximum force loss offset, the system adapts the actuation current to the actual requirements, thereby reducing energy consumption while maintaining sufficient slope holding torque reliability.
Solution Approach 2:
The patent changes the parameter of shutdown current from a fixed maximum value to a variable value that depends on multiple detected signals. By adjusting the shutdown current parameter according to actual parking conditions, the system achieves reliable slope holding with reduced energy consumption and actuation time.
2Reliability
If a maximum force loss is maintained as an offset to ensure the required slope holding torque, then the reliability of slope holding is improved, but the load on parking brake actuators and components increases over service life
Solution Approach 1:
The system dynamically adjusts the shutdown current based on detected parking situations, avoiding continuous application of maximum force. This reduces the cumulative load on parking brake actuators and components throughout their service life, thereby extending their operational duration while maintaining sufficient slope holding capability when needed.
Solution Approach 2:
Instead of always applying the maximum necessary force (excessive action), the system applies only the partial force required for the specific parking situation. By detecting actual conditions and adjusting accordingly, the system avoids unnecessary high loads that would accelerate component wear and reduce service life.
3Use of energy by moving object
If the shutdown current is reduced in parking situations where high slope holding torque is not required, then the energy consumption and component load are reduced, but the slope holding torque may become insufficient
Solution Approach 1:
The system uses feedback from multiple sensors (slope detection, direction of travel, hydraulic pressure, brake shoe conditions) to continuously monitor the actual parking situation. This feedback enables the control unit to adjust the shutdown current appropriately, ensuring sufficient slope holding torque is maintained while reducing energy consumption when high torque is not required.
Solution Approach 2:
The shutdown current is dynamically adjusted based on real-time detection of parking conditions. The system transitions between different current levels according to actual needs, ensuring sufficient slope holding torque is provided when necessary while reducing energy consumption during level or gentle slope parking situations.
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 reduces the load on parking brake units and other components by tailoring the shutdown current to the actual slope holding torque required, minimizing unnecessary energy consumption and extending the service life of components.
Implementation Method 1
brake pads typically being moved in brake drums in order to build up the required countertorque
Implementation Method 2
the parking brake units being electrically actuated
Data Source
Figure 1~2
AI summary
The invention relates to 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. The invention further relates to a braking system which is configured to carry out said type of method.