Parking Brake Clamping Force Calculation via Motor Constant Feedback
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Solution Overview
Problem
Existing methods for estimating the clamping force of a parking brake with an electric brake motor lack precision due to manufacturing tolerances, aging, and temperature fluctuations, requiring a more reliable method to determine the motor constant.
Innovation Solution
The method involves measuring instantaneous motor current and voltage values during activation, using a recursive algorithm to calculate the motor constant with high precision, and combining this with auxiliary braking systems to determine the total clamping force, considering gear reduction ratios and total resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the motor constant is determined from manufacturer specifications, then the device complexity is low, but the measurement precision deteriorates due to manufacturing tolerances, aging, and temperature fluctuations
Solution Approach 1:
The system continuously measures actual motor current and voltage during operation, calculates the motor constant from these measurements, and uses this feedback to determine the clamping force. This closed-loop approach compensates for manufacturing tolerances, aging, and temperature effects by using real-time data rather than relying on fixed manufacturer specifications.
Solution Approach 2:
The parking brake system determines its own motor constant through self-measurement of current and voltage during activation, eliminating the need for external calibration equipment or complex measurement systems. The system uses its own operational data to characterize its performance.
2Measurement precision
If instantaneous current and voltage measurements are taken during brake motor activation, then the measurement precision of clamping force improves, but the loss of time increases due to additional measurement and calculation requirements
Solution Approach 1:
The system performs current and voltage measurements continuously during the brake motor activation process, utilizing the natural operational phases (start phase, no-load phase, clamping phase) without requiring separate measurement cycles. This integrates the measurement process into the normal operation, minimizing additional time requirements.
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 allows for precise calculation of the motor constant and clamping force, enhancing the accuracy of clamping force determination in electromechanical parking brakes, even under varying conditions.
Implementation Method 1
The parking brake has an electric brake motor, via which the clamping force is generated in an electromechanical manner. When the brake motor is activated, a brake piston, which carries a brake pad, is pressed against a brake disk.
Implementation Method 2
The auxiliary braking device is, for example, a hydraulic braking system, in particular the hydraulic vehicle brake, via which a brake force for decelerating the vehicle is generated during normal vehicle operation. The hydraulic pressure acts on the brake piston.
Data Source
AI summary
A method for providing the clamping force generated by an electric brake motor in a parking brake, the clamping force being determined as a function of the motor constants of the brake motor based on instantaneous measured values of the motor current and the motor voltage.