Braking Actuator Position Verification via Motor Coasting
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Solution Overview
Problem
Existing braking devices face challenges in achieving fast actuation times while ensuring safety, particularly in highly automated parking scenarios, due to uncertainties in actuator element positioning and the risk of unintended braking force application.
Innovation Solution
A method for operating a braking device that involves detecting motor run-down variables after actuator activation to verify the actuator element's position, allowing for reduced clearance and efficient actuation, without requiring additional sensors, by utilizing motor angular speed, current, or induced voltage to determine if the predetermined position has been reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the actuator is controlled to move the actuator element to a predetermined position with reduced clearance, then the actuation time is reduced, but the risk of unintended braking force application increases
Solution Approach 1:
The control device detects motor coasting parameters (current, speed, voltage) after actuator control ends and uses this feedback to verify whether the actuator element reached the predetermined position. This closed-loop verification prevents unintended braking by confirming proper positioning before releasing the actuator.
Solution Approach 2:
The system performs preliminary verification by detecting motor coasting behavior immediately after actuation stops, before the actuator element can potentially overshoot or malfunction. This preliminary check ensures the element is at the correct position with reduced clearance but without applying unwanted braking force.
2Measurement precision
If additional sensors are installed to verify actuator element position, then the positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
The actuator's electric motor serves its own verification function by providing coasting parameters (current, speed, voltage) that are already measured during normal operation. These existing measurements are reused to verify position without requiring separate sensors, making the system self- verifying.
Solution Approach 2:
The electric motor performs multiple functions: it actuates the brake mechanism during operation and simultaneously serves as a sensor during coasting to verify the actuator element's final position. This multi-functionality eliminates the need for dedicated verification sensors.
3Speed
If the clearance between actuator element and brake piston is minimized, then the actuation speed is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The system dynamically adjusts the clearance parameter based on detected motor coasting behavior. By monitoring coasting parameters and verifying position achievement, the system can safely operate with reduced clearance while compensating for manufacturing tolerances through active verification rather than relying solely on precision manufacturing.
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 method ensures accurate positioning of the actuator element, reduces actuation time, and enhances safety by actively braking the electric motor, thereby preventing unintended braking forces and ensuring a high degree of certainty in reaching the predetermined position.
Implementation Method 1
an actuator (7) having an electric motor (8) is controlled to move an actuator element (10) into a predetermined position
Implementation Method 2
at least one motor coasting parameter is detected, and it is checked, based on the detected motor coasting parameter, whether the actuator element (10) has moved into the predetermined position
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a method for operating a braking mechanism (1), wherein an actuator (7) comprising an electric motor (8) is controlled in such a way as to move an actuator element (10) into a predefined position; upon completion of the controlling action on the actuator (7), at least one motor coasting variable is measured; and on the basis of the measured motor coasting variable, it is verified whether the actuator element (10) has moved into the predefined position.