Electronic Brake Hydraulic Backup Path for Pressure Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electronic brake systems face challenges in maintaining stable hydraulic pressure during normal operations and in emergency situations, particularly when electric components fail, which can compromise passenger safety.
Innovation Solution
The electronic brake system incorporates a first hydraulic pressure supply device, an oil pressure control unit, a second hydraulic pressure supply device, and a main isolation valve. In case of malfunctions, the system switches to fallback modes where the second hydraulic pressure supply device takes over to ensure hydraulic pressure is transmitted to all wheel cylinders, maintaining stability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electronic brake system uses electric components and control units to enable complex braking functions, then braking versatility and control precision are improved, but system reliability deteriorates when electric components fail
Solution Approach 1:
The brake system is divided into two independent hydraulic pressure supply paths: a first path with the first hydraulic pressure supply device and control unit for normal operation, and a second path with the second hydraulic pressure supply device for emergency operation. This segmentation allows the system to maintain basic braking functionality even when the electronically controlled path fails, resolving the contradiction between versatility and reliability.
Solution Approach 2:
The second hydraulic pressure supply device and second oil pressure circuit are pre-configured and ready to operate before any failure occurs. When a failure is detected in the first hydraulic pressure supply device or control unit, the system can immediately switch to the pre-prepared second path without delay, maintaining reliability while preserving the versatile electronic control capabilities during normal operation.
2Reliability
If a second hydraulic pressure supply device is added as a backup system, then system reliability is improved, but device complexity increases
Solution Approach 1:
The second hydraulic pressure supply device shares common components with the first path, including the master cylinder, brake pedal, and wheel cylinders. By merging these common elements and only duplicating the critical pressure supply functions, the system achieves improved reliability through redundancy while minimizing the increase in overall complexity.
Solution Approach 2:
The main isolation valve acts as an intermediary that controls the connection between the first and second hydraulic paths. This single valve simplifies the complexity by providing a clear, controlled interface between the two paths, allowing the system to switch between them without requiring complex multi-valve arrangements or complicated control logic.
3Productivity
If the main isolation valve remains open during normal operation, then hydraulic pressure transmission efficiency is improved, but hydraulic pressure leakage risk increases when the first hydraulic pressure supply device fails
Solution Approach 1:
The main isolation valve transitions from a static state to a dynamic, controllable state. During normal operation, the valve remains open to maintain efficient hydraulic pressure transmission. When failure is detected, the valve dynamically closes to isolate the failed first path from the second path, preventing hydraulic pressure leakage while preserving transmission efficiency during normal conditions.
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 configuration ensures stable and effective braking in various operation situations, enhances system performance and reliability, and maintains braking pressure even during component failures, thereby ensuring passenger safety.
Implementation Method 1
a first hydraulic pressure supply device for generating hydraulic pressure by means of an electric signal output in response to the displacement of a brake pedal
Implementation Method 2
a second hydraulic pressure supply device which is connected between the first oil pressure circuit and the first and second wheel cylinders, and which generates hydraulic pressure by means of the electric signal
Implementation Method 3
a main isolation valve provided in the main hydraulic path and controlling a flow of a pressurized medium, but closed in a first fallback mode in which the first hydraulic pressure supply device malfunctions to prevent the hydraulic pressure of the pressurized medium provided from the second hydraulic pressure supply device from leaking to the first hydraulic pressure supply device
Data Source
AI summary
An electronic brake system and an operating method thereof are disclosed. Provided is an electronic brake system, according to the present embodiment, comprising: a first hydraulic pressure supply device for generating hydraulic pressure by means of an electric signal output in response to the displacement of a brake pedal; an oil pressure control unit including a first oil pressure circuit for controlling the hydraulic pressure of a first wheel cylinder and a second wheel cylinder, and a second oil pressure circuit for controlling the hydraulic pressure of a third wheel cylinder and a fourth wheel cylinder; and a second hydraulic pressure supply device which is connected between the first oil pressure circuit and the first and second wheel cylinders, and which generates hydraulic pressure by means of an electric signal if the first hydraulic pressure supply device and/or the oil pressure control unit malfunctions.