Electric Wheel Brake Redundancy for Inverter Failure Stopping
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Solution Overview
Problem
Conventional vehicle electric braking devices cannot safely stop a vehicle when the inverter fails, as they rely on a single inverter for motor operation, leaving no redundancy for braking force in case of inverter failure.
Innovation Solution
A vehicle electric braking device with two independent sets of coil windings and control units, each connected to a separate inverter circuit, allowing for continued operation and safe braking even if one inverter fails by redistributing power and control signals through redundant power source relay circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single inverter is used to drive the motor, then the device complexity is reduced, but the reliability deteriorates because braking force cannot be obtained when the inverter fails
Solution Approach 1:
The single inverter system is segmented into two independent inverter circuits (first inverter circuit and second inverter circuit), each capable of independently driving the motor. This segmentation allows one inverter to take over when the other fails, thereby improving braking reliability while maintaining manageable system complexity through modular design
Solution Approach 2:
The system incorporates redundant inverter circuits and control units before failure can occur. The control units are designed to detect abnormalities in the counterpart control unit and automatically switch to using only the normal control unit, providing a cushion against potential single-point failures and ensuring continuous braking capability
2Reliability
If two sets of independent coil windings and control units are used, then the reliability is improved for inverter failure, but the device complexity increases
Solution Approach 1:
The first and second control units are merged into a single integrated control system that can operate in both normal and abnormal modes. The control units share common functionality and can seamlessly transition between operating modes, reducing the effective complexity despite having redundant components
Solution Approach 2:
Each control unit is designed with universal functionality to perform both normal control operations and abnormality handling. The control units can detect abnormalities in each other and automatically switch roles, making each unit multi-functional and reducing the need for separate specialized components
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
Ensures safe vehicle stopping by maintaining braking functionality even when an inverter fails, utilizing redundant systems to manage power and control signals effectively.
Implementation Method 1
a motor which has two sets of independent coil windings, a first coil winding and a second coil winding, and drives a braking mechanism of the wheels of the vehicle
Data Source
AI summary
The present application provides a vehicle electric braking device that can safely stop a vehicle even when a failure occurs.The vehicle electric braking device includes a wheel brake which is connected to a power source mounted on a vehicle and performs braking operation of a brake mechanism of wheels of vehicle. In the vehicle electric braking device, wheel brake includes: a motor which has two sets of independent coil windings, a first coil winding and a second coil winding, and drives a braking mechanism of the wheels of vehicle; a first control unit which is connected to the first coil winding of motor and controls motor; and a second control unit which is connected to the second coil winding of motor and controls motor. Then, wheel brake is provided on at least any one of the wheels of vehicle.