Drum Brake Bearing-Force Sensing for Torque and Clamping Control
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Solution Overview
Problem
Existing drum brake systems lack effective monitoring and calculation methods for determining the desired braking torque and clamping force, which are crucial for ensuring proper braking performance, especially in electromechanical systems where automation and autonomous driving are involved.
Innovation Solution
A method and arrangement that measure the bearing force on the brake shoes and calculate the braking torque or clamping force using predetermined factors, allowing for accurate monitoring and control of the drum brake's operating variables, enabling better automation and control in both service and parking brake functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional drum brakes are used without monitoring systems, then the device complexity is low, but the measurement precision of braking torque and clamping force is insufficient
Solution Approach 1:
The patent replaces complex mechanical measurement systems with an electromechanical approach. A force sensor (electrical sensor) measures the bearing force on the brake shoe, and an analysis unit (electronic system) calculates the braking torque and clamping force from this measurement. This substitution of mechanical measurement with electrical sensing and electronic calculation achieves high measurement precision while keeping the overall system relatively simple.
Solution Approach 2:
The patent introduces a force sensor as an intermediary element that indirectly measures the braking parameters. Instead of directly measuring braking torque or clamping force, the force sensor measures the bearing force on the brake shoe, which serves as an intermediate parameter. The analysis unit then uses this intermediate measurement to calculate the desired braking torque and clamping force values.
2Reliability
If no monitoring of braking effect is implemented, then the ease of operation is high, but the reliability of braking performance is insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the force sensor continuously monitors the bearing force on the brake shoe, and the analysis unit processes this information to determine actual braking torque and clamping force. This feedback loop allows the system to verify whether the desired braking effect is achieved, significantly improving braking performance reliability. The monitoring data can be used for control adjustments or diagnostic purposes.
3Extent of automation
If electromechanical drum brakes with automation are implemented, then the extent of automation is improved, but the device complexity increases
Solution Approach 1:
The patent replaces manual braking control with an electromechanical system. The force sensor and analysis unit automatically monitor and calculate braking parameters, enabling automated braking control. This electromechanical substitution achieves high automation for service brakes and parking brakes while managing system complexity through efficient sensor and calculation unit integration.
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 provides a simple and accurate calculation of braking torque and clamping force, enhancing the monitoring and control of drum brakes, particularly in electromechanical systems, thereby supporting autonomous driving and automatic braking functionalities.
Implementation Method 1
a force sensor (25) arranged on the first brake shoe (20) is used to determine a bearing force currently acting on the first brake shoe (20)
Data Source
Figure 1
Figure 2~4
AI summary
The invention relates to a method for ascertaining an operating variable of a drum brake, said method using forces acting on supporting bearings (25). The invention further relates to an associated drum brake assembly (10), an associated analysis unit (50) and an associated storage medium.