Electro-Hydraulic Brake Booster Mode Switching for Emergency Pressure Build
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Solution Overview
Problem
Existing hydraulic brake boosting systems lack active safety features to ensure driver and vehicle safety in emergency situations, as they rely solely on driver response, which can be inadequate in improper operation or emergency conditions.
Innovation Solution
A multi-mode electro-hydraulic brake boosting system with two control modes: electro-hydraulic boosting mode and emergency mechanical braking mode, utilizing a relative displacement sensor, motor, brake master cylinder, Hall sensor, and ball screw to provide precise control and rapid pressure buildup, with a double-closed-loop controller for accurate pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional hydraulic brake boosting system is used, then the system structure is simple, but the system lacks active safety features and cannot ensure driver safety in emergency situations
Solution Approach 1:
The brake boosting system is divided into two independent modes: electro-hydraulic boosting mode and emergency mechanical braking mode. This segmentation allows the system to provide active safety features through the electro-hydraulic mode while maintaining a relatively simple structure through the mechanical backup mode, resolving the contradiction between reliability improvement and structural complexity
Solution Approach 2:
The system performs preliminary action by pre-positioning the motor and control systems in the electro-hydraulic boosting mode, and pre-configuring the mechanical linkage for emergency braking. This allows the system to actively ensure driver safety before emergencies occur, rather than relying solely on driver response during critical moments
2Measurement precision
If electro-hydraulic boosting mode is used, then precise pressure control is achieved, but the system response time increases due to motor activation and pressure buildup
Solution Approach 1:
The system dynamically switches between electro-hydraulic boosting mode and emergency mechanical braking mode based on real-time conditions. This dynamic adaptation allows the system to use the precise but slower electro-hydraulic mode when time permits, and the immediate mechanical mode when rapid response is critical, resolving the contradiction between precision and response time
Solution Approach 2:
The system changes operational parameters by switching between two distinct braking modes with different characteristics. The electro-hydraulic mode provides precise pressure control with controlled response time, while the mechanical mode provides immediate response. This parameter change strategy allows the system to optimize for either precision or speed depending on situational requirements
3Extent of automation
If the system relies solely on driver response, then the control system is simple, but the system cannot actively intervene to ensure safety in improper operation or emergency situations
Solution Approach 1:
The system provides self-service through automatic mode switching and active safety intervention capabilities. The control system automatically determines when to switch between electro-hydraulic and mechanical modes, and can actively intervene in emergency situations without requiring complex external control systems, thus achieving automation while managing complexity
Solution Approach 2:
The brake boosting system is designed with multi-functionality to serve both normal braking operations and emergency safety interventions. The same hardware platform supports both driver-operated braking and active safety features, reducing overall system complexity while enabling automated intervention capabilities
4Reliability
If mechanical linkage is used for emergency braking, then the system maintains simplicity and reliability, but the braking force control precision is reduced
Solution Approach 1:
The system applies beforehand cushioning by preparing the electro-hydraulic boosting system in advance to compensate for the precision limitations of mechanical emergency braking. The electro-hydraulic system acts as a buffer that can provide precise force control when needed, while the mechanical system provides reliable backup functionality
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 enhances braking safety and comfort by providing stable braking feedback, rapid pressure buildup during emergency braking, and maintaining braking functionality even when boosting fails, improving vehicle safety and drivability.
Implementation Method 1
when the motor works, the motor rotates, the small gear drives the feed screw nut to rotate
Implementation Method 2
the feed screw nut is connected with the ball screw, so that the ball screw is pushed to move horizontally
Implementation Method 3
the Hall sensor detects the distance between the ball screw and the bottom of the push head of the brake master cylinder
Data Source
AI summary
Disclosed is a multi-mode electro-hydraulic brake boosting system and a control method thereof. When the boosting system fails, an emergency mechanical braking mode is achieved through structural redundancy, in a normal boosting mode, the system has a general braking mode and an emergency braking mode according to the strength requirements of a brake, and a general brake boosting mode and an emergency active pressurizing mode are controlled, respectively. Accurate boosting can be provided in the general braking process so that the pressure of a brake master cylinder can accurately follow target pressure, pressure buildup of the brake master cylinder can be completed more quickly in the emergency braking process, braking force is output to the maximum extent, the system response time of an emergency braking working condition is shortened, the braking capacity is improved, and traffic accidents are avoided.