Electromechanical Brake Pad Contact Detection to Prevent Drag
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electromechanical brake systems face issues with the drag phenomenon during brake release operations due to the need for expensive sensors to accurately identify the position of the brake pad, necessitating a cost-effective method to detect contact between the brake pad and brake disc.
Innovation Solution
An electromechanical brake system that calculates a differential value of motor current or revolutions per minute (rpm) with respect to time to detect contact between the brake pad and brake disc, sets an origin position by storing a position moved backward by a preset gap distance from the contact point, and updates this position during vehicle operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is used to identify the position of the brake pad, then the position control accuracy is improved, but the system cost increases
Solution Approach 1:
The patent replaces the mechanical sensor-based position detection system with an electrical field-based detection system. The controller detects brake pad contact with the brake disc by monitoring changes in motor current or voltage characteristics, eliminating the need for physical sensors and reducing system cost while maintaining detection accuracy.
Solution Approach 2:
The system uses the motor's own electrical parameters (current, voltage, rpm) to detect brake pad position and contact status. The motor serves dual purposes: both actuation and sensing, eliminating the need for separate detection components and reducing overall system complexity.
2Device complexity
If the brake pad position is not accurately controlled, then the system cost is reduced, but the drag phenomenon occurs during brake release
Solution Approach 1:
The system implements feedback control by continuously monitoring motor electrical parameters during brake release. When the controller detects that the brake pad has separated from the brake disc based on current or voltage threshold values, it adjusts the motor control to maintain the appropriate gap, preventing drag while using simple electrical measurements rather than complex sensors.
Solution Approach 2:
The patent monitors changes in electrical parameters (current, voltage, rpm) to detect brake pad contact and separation. By setting threshold values for these parameters, the system can accurately determine contact status and control the brake release process to prevent drag without requiring expensive position sensors.
Data Source
AI summary
An electromechanical brake system including an actuator of an electromechanical brake that operates by a motor, according to an aspect of the disclosure, includes: a motor driver configured to drive the motor; and a controller electrically connected to the motor driver, wherein the controller is configured to calculate a differential value of a control parameter for controlling the motor with respect to time while moving a brake pad of the electromechanical brake forward, compare the calculated differential value to a preset reference value to detect occurrence of a contact between the brake pad and a brake disc of the electromechanical brake, store a contact position at which the contact between the brake pad and the brake disc has occurred, and set an origin position by storing a position moved backward by a preset gap distance from the contact position.