Electro-Mechanical Brake Current Distribution via Electrical Angle Cycling
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Solution Overview
Problem
Electro-mechanical brakes face issues with increased current consumption during braking, leading to potential damage to three-phase motors and electronic control units, as well as reduced lifespan and performance of parts due to concentrated maximum current at specific electrical angles.
Innovation Solution
A control method that operates by calculating and adjusting the electrical angle of the three-phase motor to distribute maximum current, forcibly moving it to adjacent angles when the vehicle stops, thereby reducing current concentration and stress on field effect transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the electro-mechanical brake operates to stop the vehicle with maximum braking pressure, then the braking performance is improved, but the current consumption of the three-phase motor increases excessively
Solution Approach 1:
The patent applies periodic action by cyclically switching between different electrical angles (0°, 60°, 120°, 180°, 240°, 300°) in a predetermined sequence. This periodic switching distributes the maximum current demand across multiple phases and time periods, preventing sustained high current consumption at any single electrical angle while maintaining effective braking pressure.
2Productivity
If the electrical angle is fixed at the maximum current point for optimal braking, then the braking efficiency is improved, but the three-phase motor and ECU are damaged due to concentrated maximum current
Solution Approach 1:
The patent implements dynamics by making the electrical angle variable rather than fixed. The control unit dynamically switches the electrical angle through multiple predetermined values (0°, 60°, 120°, 180°, 240°, 300°) in a cyclic manner. This dynamic adjustment ensures that maximum current is not concentrated at a single electrical angle, distributing the thermal and electrical stress across multiple phases to protect the motor and ECU while maintaining braking efficiency.
3Reliability
If the electrical angle is forcibly moved to adjacent angles to distribute current, then the component durability is improved, but the control system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining a fixed sequence of electrical angles (0°, 60°, 120°, 180°, 240°, 300°) that are switched in a predetermined cyclic order. This preliminary setup of switching patterns simplifies the control logic compared to real-time optimization algorithms, as the control unit only needs to execute the pre-planned sequence rather than perform complex calculations during braking operations.
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 reduces the degree of fatigue in field effect transistors, improves system durability, and extends the lifespan and performance of components by distributing peak currents across phases.
Implementation Method 1
a three-phase motor... may be damaged
Implementation Method 2
a brake of a vehicle puts a brake on a wheel by braking pressure... to reduce a speed of the vehicle or maintain a stop state
Data Source
AI summary
Disclosed is a control method of an electro-mechanical brake, including: a first step of operating a brake to stop a vehicle and generating a target pressure value of the brake; a second step of calculating an electrical angle of a three-phase motor and preparing movement of the electrical angle when the vehicle stops; a third step of checking errors of requested current and pressure; a fourth step of setting a range of the electrical angle when the current and the pressure are normal; and a fifth step of forcibly moving an actual position of the electrical angle to an adjacent electrical angle.