Electric Brake Device Frequency-Dependent Control
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Solution Overview
Problem
Electric brake devices consume excessive power due to fluctuations in braking force caused by external factors like noise and uneven brake pad wear, leading to increased motor oscillation and power consumption.
Innovation Solution
An electric brake device with a control device that detects frequency fluctuations and limits the operating quantity using predetermined parameters, such as upper and lower limits, gain, or dead band, to reduce motor output and power consumption while maintaining permissible braking force fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the electric motor operates at high speed to maintain braking force, then the braking force is maintained, but the power consumption increases markedly
Solution Approach 1:
The control device dynamically adjusts the operating quantity of the electric motor based on the detected frequency of braking force fluctuations. When frequency exceeds the threshold, the control device limits the operating quantity, allowing the system to adapt its response based on real-time conditions rather than maintaining constant high-speed operation
Solution Approach 2:
The invention changes the control parameter from constant operating quantity to frequency-dependent operating quantity. By detecting the frequency of braking force fluctuations and comparing it to a threshold, the system modifies the operating quantity parameter dynamically, reducing motor speed and power consumption when fluctuations are at high frequency
2Use of energy by moving object
If the control device limits the operating quantity at high frequency, then the power consumption is reduced, but the braking force fluctuations increase
Solution Approach 1:
The control device implements a feedback mechanism by detecting the frequency of braking force fluctuations and using this information to adjust the operating quantity. The frequency detection creates a closed-loop system where the control action is based on measured system behavior, allowing the device to respond appropriately to actual fluctuation conditions
Solution Approach 2:
The system changes the operating quantity parameter based on the detected frequency parameter. When frequency is high, the operating quantity is reduced; when frequency is below the threshold, normal operation continues. This parameter transformation allows the system to tolerate higher braking force fluctuations at frequencies where they have minimal impact on vehicle performance
Data Source
Figure 1
Figure 2
Figure 3~4(c)
AI summary
It is desired to reduce the power consumption of an electric brake device, while reducing fluctuations in braking force within a permissible range. The brake device includes a control device (3) which performs feedback control using a braking force of a linear motion mechanism (2) as a controlled variable. The control device (3) includes a computing unit (4) for computing an operating quantity (voltage applied to an electric motor (1)) for canceling out fluctuations in braking force, and a frequency detector (5) for detecting the frequency of the operating quantity. The control device (3) further includes an operating quantity limiting unit (6) which limits the operating quantity according to a predetermined parameter when the detected frequency is higher than a predetermined frequency threshold, i.e. when the detected frequency is in a high-frequency range in which the permissible value of the braking force fluctuations is high, whereby it is possible to reduce the output of the electric motor (1) within a range in which the braking force fluctuations does not exceed the permissible value, thereby reducing the power consumption.