Electronic Brake Hydraulics for Partial Motor Winding Failure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electronic brake systems using separate winding motors face challenges in miniaturization and maintaining braking performance when motor performance is reduced due to partial failures.
Innovation Solution
The electronic brake system incorporates a hydraulic pressure supply device with a motor having separate system windings and a control valve that transfers hydraulic pressure between pressure chambers, allowing the system to compensate for reduced motor performance by increasing hydraulic pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a larger size motor is designed to maintain braking performance when one system fails, then braking performance is maintained, but packaging difficulty increases and integration with existing motor becomes difficult
Solution Approach 1:
The patent merges the functions of two separate pressure chambers into a single integrated motor structure. The first and second pressure chambers share a common motor, allowing the motor to maintain full braking performance even when one system fails, without requiring a larger motor size. This combining approach resolves the contradiction by achieving reliability through functional integration rather than physical scaling.
Solution Approach 2:
The single motor is designed to serve multiple functions - it can independently control both the first pressure chamber and the second pressure chamber. This multi-functionality allows the motor to maintain braking performance across different failure scenarios without requiring separate motors for each system, thereby avoiding the need for a larger motor while ensuring reliability.
2Reliability
If more current is used to achieve similar braking performance when motor performance is reduced, then braking performance is maintained, but motor heat increases
Solution Approach 1:
By combining the control of both pressure chambers under a single motor, the system avoids the need to increase current to one motor. The single motor distributes its workload efficiently across both chambers, maintaining braking performance without excessive current draw and thereby preventing motor overheating.
3Reliability
If separate winding motors are used for vehicle safety, then safety is improved, but device complexity increases
Solution Approach 1:
The patent combines the safety functions of separate winding motors into a single motor with integrated first and second pressure chambers. This merging maintains the safety benefits of redundant systems while reducing the overall complexity by eliminating the need for two independent motor assemblies, thereby resolving the contradiction between safety and complexity.
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 solution enables the electronic brake system to maintain stable braking performance even when motor performance is reduced, without the need for larger motors, thus achieving miniaturization and improved reliability.
Implementation Method 1
a hydraulic pressure supply device including a first pressure chamber provided in front of a hydraulic piston and a second pressure chamber provided at a rear of the hydraulic piston, and configured to generate a hydraulic pressure by moving the hydraulic piston forward or backward
Implementation Method 2
a control valve configured to open and close a flow path that communicates the first pressure chamber and the second pressure chamber, and when a portion of the plurality of separate system windings of the motor fails, the controller is configured to open the control valve to push the hydraulic piston so that a portion of a hydraulic pressure discharged from a pressure chamber is transferred to another pressure chamber
Data Source
AI summary
An electronic brake system includes: a reservoir in which a pressurized medium is stored; a hydraulic pressure supply device comprising a first pressure chamber provided in front of a hydraulic piston and a second pressure chamber provided at a rear of the hydraulic piston, and configured to generate a hydraulic pressure by moving the hydraulic piston forward or backward; a hydraulic control unit configured to control a flow of the hydraulic pressure transferred to a wheel cylinder from the hydraulic pressure supply device; and a controller configured to control the hydraulic pressure supply device and the hydraulic control unit, wherein the hydraulic pressure supply device comprises a motor having a plurality of separate system windings for moving the hydraulic piston, and a control valve configured to open and close a flow path that communicates the first pressure chamber and the second pressure chamber, and when a portion of the plurality of separate system windings of the motor fails, the controller is configured to open the control valve to push the hydraulic piston so that a portion of a hydraulic pressure discharged from a pressure chamber is transferred to another pressure chamber.