Electronic Hydraulic Brake Redundancy Without a Backup Master Cylinder
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Solution Overview
Problem
Existing electronic hydraulic brake systems lack redundancy braking capabilities, particularly in autonomous driving modes, and struggle to generate appropriate braking pressure during malfunctions of the main braking device.
Innovation Solution
An electronic hydraulic brake system with a main braking device and a secondary braking device, controlled by a main and assistant controller, respectively, to ensure redundancy braking force is maintained even when the main device malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a physical backup master cylinder is installed for redundancy braking, then braking reliability is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent replaces the traditional mechanical backup master cylinder with an electronically controlled secondary braking device driven by a motor. This substitution eliminates the need for a separate physical backup cylinder while maintaining redundancy braking capability through electronic control systems that can activate the secondary braking device when the main braking device fails.
Solution Approach 2:
The secondary braking device is designed to serve multiple functions: it acts as a backup braking system when the main braking device fails, and can also function as a primary braking device under normal operating conditions. This multi-functionality reduces the need for separate dedicated backup components, thereby reducing overall system complexity.
2Force
If a full-capacity backup master cylinder is installed for emergency braking, then braking pressure is improved, but device size and weight increase
Solution Approach 1:
The patent replaces the heavy mechanical backup master cylinder with a motor-driven secondary braking device. The motor provides the necessary force multiplication electronically, eliminating the need for a large-capacity mechanical cylinder and its associated heavy structure, thereby achieving emergency braking pressure without increasing device weight.
Solution Approach 2:
The system dynamically adjusts braking pressure parameters by controlling the motor's output force through electronic control. The secondary braking device can generate sufficient braking pressure for emergency situations by optimizing motor torque and hydraulic pressure control, without requiring a permanently oversized mechanical structure.
3Device complexity
If a motor-driven secondary braking device is used instead of a physical backup master cylinder, then device complexity is reduced, but braking response time may be affected
Solution Approach 1:
The system performs preliminary actions by continuously monitoring the main braking device's operation and pre-positioning the secondary braking device in a ready state. The motor and hydraulic system of the secondary braking device are kept prepared and can be activated immediately upon detection of main braking device failure, minimizing response time delay.
Solution Approach 2:
The control system continuously receives feedback from sensors monitoring the main braking device's pressure and operation status. When abnormal conditions are detected, the control system immediately triggers the secondary braking device, creating a fast closed-loop response that maintains braking response time despite the electronic control architecture.
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 provides appropriate redundancy braking force in situations where a driver is not attentive, such as in autonomous driving, and maintains a compact size without the need for a backup master cylinder.
Implementation Method 1
a main braking device configured to generate pressure of brake oil in cooperation with a main braking motor
Implementation Method 2
a secondary braking device configured to generate pressure of brake oil in cooperation with a secondary braking motor
Data Source
AI summary
The present disclosure provides an electronic hydraulic brake system that can appropriately provide redundancy braking force, that is, an electronic hydraulic brake system that provides a so-called redundancy function, in the situation in which a driver does not drive or gives less attention to driving such as autonomous driving or smart cruise control and a main braking device malfunctions.