Electromechanical Brake Actuation Distance Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electromechanical brake mechanisms face challenges in accurately determining and adjusting the actuation distance due to manufacturing tolerances and fluctuations caused by aging and temperature changes, leading to potential brake drag during contact between the brake lining and disk.
Innovation Solution
A method to determine and adjust the actuation distance in an electromechanical brake mechanism by using initial and estimated values of the motor constant and total motor resistance, allowing for precise correction of spindle nut travel to minimize free travel and reduce the time to build up brake force, thereby avoiding brake drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the motor constant and total motor resistance are determined using initial values only, then the determination process is simple, but the precision of actuation distance determination deteriorates due to manufacturing tolerances and aging-related fluctuations
Solution Approach 1:
The patent performs preliminary estimation of the motor constant and total motor resistance during a no-load phase before the actual clamping process. This preliminary action allows the system to obtain updated values that account for aging and temperature effects, thereby improving the precision of actuation distance determination without adding complex hardware during the critical braking phase.
Solution Approach 2:
The system measures voltage and motor current during operation to continuously estimate and update the motor constant and total motor resistance. This feedback mechanism enables the system to adapt to changes over time and maintain high precision in actuation distance determination despite manufacturing tolerances and environmental variations.
2Productivity
If the free travel (brake clearance) is not adjusted, then the structure remains simple, but the time interval until building up brake force increases and brake drag may occur
Solution Approach 1:
The system performs preliminary determination of the actuation distance using updated motor parameters before the clamping process begins. By calculating the precise actuation distance in advance based on current motor constant and resistance values, the system can minimize the free travel phase and reduce the time required to build up brake force, while avoiding brake drag through accurate positioning.
3Reliability
If the motor constant and resistance values are not updated, then the system operation is stable, but temperature-related and aging-related changes cause inaccuracies in actuation distance
Solution Approach 1:
The system performs self-calibration by automatically estimating its own motor constant and total motor resistance during normal operation. Through internal measurements of voltage and current during a no-load phase, the system updates its parameters without requiring external calibration equipment or manual intervention, thereby maintaining high reliability under varying temperature and aging conditions while keeping the system easy to manufacture and maintain.
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
The method enables high-precision determination and adjustment of the actuation distance, reducing the time to build up brake force and minimizing the risk of brake drag by accounting for temperature-related and aging-related changes in motor constants and resistances.
Implementation Method 1
an electric brake motor (3), the motor shaft of which drives a spindle (4) on which a spindle nut (5) is rotatably supported. The spindle nut (5) is axially displaced by the rotational movement of the spindle (4)
Implementation Method 2
a brake lining (7, 8) which is pressed against the brake disk (10) by the brake piston (6) to generate the desired brake force
Data Source
AI summary
The disclosure relates to a method for determining the actuation distance in an electromechanical brake device having an electric brake motor, wherein the distance of a spindle nut is first determined while taking into account an initial value for the motor constant and the motor total resistance and a correction of the spindle nut distance is then performed after an estimation has been performed.