Electric Brake Motor Current Trend Judgment
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Solution Overview
Problem
Existing electric brake devices face challenges in suppressing variation in arrival current (thrust) while maintaining robustness against current fluctuations, leading to potential false detection of application completion.
Innovation Solution
An electric brake device with a control unit that determines judgment timing for stopping the electric motor based on the change trend of the motor's current value, ensuring robustness against current fluctuations and reducing thrust variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a threshold value method is used to judge application completion, then robustness against current fluctuation is improved, but variation in arrival current increases
Solution Approach 1:
The patent applies dynamics by making the judgment timing adaptive rather than fixed. The control unit dynamically determines when to judge application completion based on the actual current fluctuation characteristics observed during operation. This allows the system to adjust its judgment criteria in real-time, balancing robustness against fluctuations with precision in arrival current control.
Solution Approach 2:
The patent changes the parameter of judgment timing from a static threshold-based approach to a dynamic timing determination based on current fluctuation patterns. By modifying when the judgment is made rather than just what threshold is used, the system achieves both robustness and precision simultaneously.
2Reliability
If judgment timing is extended to suppress current fluctuation impact, then robustness is improved, but responsiveness deteriorates
Solution Approach 1:
The system dynamically adjusts the judgment timing based on actual current characteristics rather than using a fixed extended timing. This allows the judgment to be made as soon as sufficient data is available to ensure robustness, optimizing responsiveness without sacrificing reliability.
Solution Approach 2:
The control unit uses feedback from current fluctuation patterns to determine appropriate judgment timing. By continuously monitoring current characteristics and adjusting judgment timing accordingly, the system achieves robustness without unnecessary delays that would reduce responsiveness.
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 solution effectively suppresses variation in arrival current and thrust, improving responsiveness, reducing operating noise, and enabling a smaller, lighter electric brake mechanism while maintaining robustness.
Implementation Method 1
an electric brake mechanism in which a piston propelled by a rotation-linear motion mechanism driven by an electric motor
Implementation Method 2
a piston propelled by a rotation-linear motion mechanism driven by an electric motor
Implementation Method 3
press a braking member against a braked member
Data Source
AI summary
An electric brake mechanism includes a piston (6D) propelled by a rotation-linear motion mechanism (8) driven by an electric motor (7A). The piston (6D) is configured to press brake pads (6C) against a disc rotor (4), and to hold the brake pads (6C) at a pressing position by stopping the electric motor (7A). A parking brake control device (24) is configured to determine, when a request (application command) to hold the brake pads (6C) is made, a judgment timing for judging whether to stop the electric motor (7A) based on a change trend of a current value of the electric motor (7A). When the judgment timing is reached, the parking brake control device (24) judges whether or not to stop the electric motor (7A).