Electronic Brake Motor Control for Current Distribution
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Solution Overview
Problem
Existing electronic brake systems face challenges in maintaining high brake pressure while preventing current concentration at a single phase of the motor, leading to potential FET burning and brake malfunction, especially with increased brake pressure requirements.
Innovation Solution
A control method for the motor of an electronic brake that includes measuring and calculating the electrical angle, controlling current flow based on the changed electrical angle, and switching between different electrical angle-moving modes to distribute current across phases, thereby preventing long-term concentration of current at any one phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If brake pressure is increased to 90 bar to satisfy revised laws and regulations, then braking performance is improved, but current concentration at a single motor phase increases causing FET burning and brake malfunction
Solution Approach 1:
The patent applies dynamics by making the electrical angle movable instead of fixed. The control unit dynamically adjusts the electrical angle of the motor within its rotation cycle, shifting the current distribution pattern over time. This prevents steady-state current concentration at any single phase, allowing high brake pressure (90 bar) to be maintained without causing FET burning or brake malfunction.
2Power
If current is concentrated at one phase of the motor to generate sufficient torque for high brake pressure, then braking force is improved, but FET burning and malfunction occur due to excessive heat generation
Solution Approach 1:
The patent implements periodic action by continuously varying the electrical angle of the motor in a periodic manner during operation. This causes the current to be distributed across different phases over time rather than concentrated in one phase continuously. The periodic shifting of current distribution prevents sustained high current in any single phase, thereby reducing heat generation and preventing FET burning while maintaining sufficient motor torque for high brake pressure.
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 effectively maintains vehicle stoppage with increased brake pressure, extends the lifespan of FETs by preventing excessive heat generation, and ensures the brake system's reliability by avoiding current concentration, thus adhering to revised regulatory standards.
Implementation Method 1
measures an electrical angle and a current supplied to a motor, generates torque by operating the motor by controlling a current flowing to the motor
Data Source
AI summary
Disclosed is a control method for a motor of an electronic brake. The control method for a motor of an electronic brake includes: a stop mode-starting step of starting a stop mode when a vehicle is stopped by a brake; an electrical angle-measuring step of measuring an electrical angle of a motor providing pressure to the brake in the stop mode; an electrical angle-calculating step of calculating a changed electrical angle using a predetermined electrical angle change and the electrical angle of the motor measured in the electrical angle-measuring step; and a motor-controlling step of controlling a current flowing to the motor in accordance with the changed electrical angle. Therefore, it is possible to keep a vehicle stopped, prevent a high current from flowing at any one phase of the motor, and prevent the motor from burning.