Electric Hydraulic Brake Layout With Redundant Reservoir-Pump Flow
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Solution Overview
Problem
Existing electric hydraulic brake systems face complexity in layout, increased cost, and weight due to the addition of an auxiliary brake system, which complicates the brake system and increases overall weight and cost.
Innovation Solution
The electric hydraulic brake integrates a main brake unit and hydraulic controller into a one-box configuration, reducing the number of components and simplifying the brake piping layout, while incorporating auxiliary flow paths that directly connect the reservoir to the pumps, bypassing the master cylinder, and utilizing controllers to manage both main and auxiliary brake motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an auxiliary brake system is added to the main brake system to implement redundancy, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the main brake unit and hydraulic controller into a single integrated assembly. The main brake motor, master cylinder, and hydraulic control components are combined in one unit, allowing the auxiliary brake system to share these components rather than requiring separate duplicate systems. This integration maintains redundancy while reducing overall system complexity.
Solution Approach 2:
The hydraulic controller is designed to serve multiple functions: it controls both the main brake motor and the auxiliary brake motor, and manages both normal braking operations and fail-safe operations. The pump can draw brake oil from the reservoir through different paths depending on whether the main brake system is operational, providing universal functionality that reduces the need for separate dedicated components.
2Reliability
If an auxiliary brake system is added to the main brake system to implement redundancy, then reliability is improved, but weight increases
Solution Approach 1:
By combining the main brake unit and hydraulic controller into one integrated assembly, the patent eliminates the need for separate auxiliary brake system components. The auxiliary brake motor shares the hydraulic controller, pump, and reservoir with the main brake system, significantly reducing the total weight compared to having completely separate redundant systems.
Solution Approach 2:
The hydraulic controller and pump serve dual purposes: they support both the main brake system during normal operation and the auxiliary brake system during fail-safe operation. This multi-functionality means that components are not duplicated but rather repurposed, reducing overall system weight while maintaining redundancy.
3Reliability
If an auxiliary brake system is added to the main brake system to implement redundancy, then reliability is improved, but cost increases
Solution Approach 1:
The integration of the main brake unit and hydraulic controller into a single assembly reduces the total number of components that need to be manufactured, sourced, and assembled. By sharing components between the main and auxiliary brake systems, the patent reduces material costs, manufacturing complexity, and assembly costs compared to fully redundant separate systems.
Solution Approach 2:
The hydraulic controller is designed as a universal control unit that manages both main and auxiliary brake motors, reducing the need for separate control systems. This multi-functionality reduces component count and manufacturing cost while maintaining the required redundancy for safety.
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 enhances cost competitiveness and maintains required performance by reducing components, simplifying layout, and ensuring redundancy through direct reservoir-pump connections, thus maintaining effective braking even in the event of main brake unit malfunction.
Implementation Method 1
a pump configured to form pressure of the brake oil in conjunction with an auxiliary brake motor
Implementation Method 2
a master cylinder connected to the reservoir, and operated in conjunction with a main brake motor to generate pressure of the brake oil
Implementation Method 3
a hydraulic block configured to selectively transmit the pressure of the brake oil formed in the master cylinder or the pump to the plurality of wheel brakes
Data Source
AI summary
An electric hydraulic brake includes: wheel brakes configured to braking force to wheels of a vehicle; a reservoir storing brake oil; a master cylinder connected to the reservoir, and operated in conjunction with a main brake motor to generate pressure of the brake oil; a first controller configured to control the main brake motor; a hydraulic controller including a pump configured to form pressure of the brake oil in conjunction with an auxiliary brake motor, and a hydraulic block configured to selectively transmit the pressure of the brake oil formed in the master cylinder or the pump to the wheel brakes; and a second controller configured to control the auxiliary brake motor when the master cylinder or the first controller malfunctions. The hydraulic controller is provided with an auxiliary flow path to transmit the brake oil from the reservoir to the pump directly through the auxiliary flow path.