Electronic Brake Hydraulics With Mechanical Backup Pressure Path
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Solution Overview
Problem
Conventional electronic brake systems face instability in generating hydraulic pressure for braking, particularly when electronic components fail, compromising safety and requiring a mechanism to directly link brake pedal operation to wheel cylinders for immediate hydraulic pressure generation.
Innovation Solution
An electronic brake system with an integrated master cylinder, hydraulic pressure supply device, and control unit that includes backup flow paths and inspection valves to ensure stable hydraulic pressure transmission and quick failure detection, allowing for normal or abnormal operation modes based on component status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electronic brake system is used to implement various braking functions, then braking versatility is improved, but system reliability deteriorates when electronic components fail
Solution Approach 1:
The brake system is divided into two independent pathways: a normal operation mode using electronic control for versatile braking functions, and an abnormal operation mode with direct mechanical linkage for reliable emergency braking. This segmentation allows the system to switch between electronic control (for versatility) and mechanical backup (for reliability) depending on component status.
Solution Approach 2:
The system incorporates a backup mechanical linkage pathway that is prepared in advance for emergency use. Inspection valves and flow paths are pre-configured to enable immediate switching to the abnormal operation mode if electronic components fail, providing prior cushioning against potential failures.
2Measurement precision
If electronic control is used to operate the hydraulic pressure supply device, then braking precision is improved, but response time deteriorates in case of component failure
Solution Approach 1:
The system dynamically switches between electronic control mode (for precision) and direct mechanical linkage mode (for speed). When electronic components are functioning normally, the system uses precise electronic control. Upon detecting component failure, it immediately transitions to the mechanical backup pathway that provides faster, direct response without electronic delays.
Solution Approach 2:
The inspection valve acts as an intermediary that monitors the status of electronic components and mediates the switch between normal and abnormal operation modes. It detects component failures and enables the transition from electronic control to direct mechanical linkage, ensuring both precision during normal operation and speed during emergencies.
3Reliability
If inspection mechanisms are added to detect component failures, then system safety is improved, but device complexity increases
Solution Approach 1:
The inspection valve performs self-diagnosis by monitoring its own status and the status of electronic components. It automatically detects failures and triggers the switch to the abnormal operation mode without requiring external monitoring systems, thereby improving safety while minimizing the addition of complex external inspection mechanisms.
Solution Approach 2:
The inspection valve serves multiple functions: it monitors electronic component status, controls the switching between operation modes, and maintains system pressure. This multi-functionality reduces the need for separate dedicated inspection devices, thereby improving safety while limiting the increase in overall system complexity.
4Reliability
If backup hydraulic pathways are implemented for direct pressure transmission, then braking reliability is improved, but manufacturing cost increases
Solution Approach 1:
The backup hydraulic pathways are merged with the normal operation hydraulic system, sharing common components such as the master cylinder, hydraulic fluid, and wheel cylinders. This integration allows the backup pathway to be implemented using existing system components rather than requiring entirely separate duplicate systems, thereby improving reliability while controlling manufacturing costs.
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
The system effectively stabilizes braking performance, quickly identifies component failures, and ensures durable and reliable operation by reducing component loads and improving assemblability and productivity while maintaining safety.
Implementation Method 1
a pedal simulator compressed by the displacement of the master piston and configured to provide a pedal feeling through an elastic restoring force generated by the compression
Implementation Method 2
a hydraulic pressure supply device including a hydraulic piston operated by an electrical signal output in response to a displacement of the brake pedal and configured to generate a hydraulic pressure of a pressure medium
Implementation Method 3
a hydraulic pressure control unit including a first hydraulic circuit configured to control a flow of a pressure medium supplied to a first wheel cylinder and a second wheel cylinder and a second hydraulic circuit configured to control a flow of a pressure medium supplied to a third wheel cylinder and a fourth wheel cylinder
Data Source
AI summary
An electronic brake system is disclosed. An electronic brake system according to the present embodiment may be provided by including: a reservoir in which a pressure medium is stored; an integrated master cylinder which is connected to a brake pedal to discharge the pressure medium by an operation of the brake pedal and provides a pedal feeling to driver; a hydraulic pressure supply device for operating a hydraulic piston by an electrical signal output corresponding to a displacement of the brake pedal, to generate a hydraulic pressure in a single pressure chamber; and a hydraulic pressure control unit which is provided between the hydraulic pressure supply device and multiple wheel cylinders and controls a flow of the pressure medium supplied to the multiple wheel cylinders.