Electric Hydraulic Brake Layout With Integrated Auxiliary Flow Paths
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Solution Overview
Problem
The complexity and increased cost and weight of electric hydraulic brake systems due to the addition of auxiliary brake systems for redundancy, which complicates the layout and raises costs and weight concerns.
Innovation Solution
An electric hydraulic brake system is designed with a one-box configuration integrating the main brake unit and hydraulic controller, featuring a master cylinder, auxiliary brake motor, and hydraulic block with auxiliary flow paths that allow direct transmission of brake oil from the reservoir to the pumps, reducing the need for additional valves and simplifying the piping layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an auxiliary brake system is added to the main brake system to implement redundancy, then the reliability of the brake system is improved, but the device complexity increases
Solution Approach 1:
The patent integrates the auxiliary brake system components (auxiliary brake motor, pump, and hydraulic block) into a unified hydraulic controller assembly. The auxiliary brake motor is positioned adjacent to the main brake motor, and the hydraulic block consolidates multiple flow paths and valve functions in a single integrated component, reducing overall system complexity while maintaining redundancy
Solution Approach 2:
The hydraulic block is designed as a multi-functional component that handles both main brake and auxiliary brake operations through integrated flow paths. The same hydraulic block manages brake oil distribution for normal braking, auxiliary braking, and various braking control functions (ABS, ESC, HHC), eliminating the need for separate dedicated hydraulic components for each function
2Reliability
If an auxiliary brake system is added to the main brake system to implement redundancy, then the reliability of the brake system is improved, but the weight increases
Solution Approach 1:
The auxiliary brake motor is mounted adjacent to the main brake motor on the same housing structure, and both motors share common mounting brackets and control electronics. The hydraulic pump for the auxiliary system is integrated into the same hydraulic block that serves the main brake system, consolidating multiple functions into shared components and reducing overall weight
Solution Approach 2:
The auxiliary brake motor is positioned within the same housing as the main brake motor, with the auxiliary motor effectively nested in the available space around the main motor. The hydraulic controller housing contains both the main and auxiliary brake components, creating a compact nested arrangement that minimizes weight while providing redundancy
3Reliability
If additional valves and complex piping are added for auxiliary brake flow paths, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The hydraulic block incorporates universal flow paths that serve multiple braking functions. The same hydraulic passages and valve mechanisms handle both main brake and auxiliary brake operations, as well as ABS, ESC, and HHC functions, eliminating the need for separate dedicated piping and valve systems for each braking mode
Solution Approach 2:
The patent extracts and consolidates the essential auxiliary braking functionality into a simplified flow path configuration within the hydraulic block. By removing unnecessary intermediate valves and complex piping connections, the design achieves auxiliary braking capability through a streamlined set of direct flow paths from the reservoir through the pump to the wheel cylinders
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, maintains performance, and ensures redundancy by simplifying the brake system layout, reducing components, and providing effective auxiliary braking even in case of main brake unit malfunctions.
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
transmits the hydraulic pressure to wheel cylinders to generate braking force in each wheel cylinder
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An electric hydraulic brake (1) includes: wheel brakes configured to braking force to wheels of a vehicle; a reservoir (110) storing brake oil; a master cylinder (120) connected to the reservoir (110), and operated in conjunction with a main brake motor (122) to generate pressure of the brake oil; a first controller (10) configured to control the main brake motor (122); a hydraulic controller (200) including a pump (231, 232) configured to form pressure of the brake oil in conjunction with an auxiliary brake motor (230), and a hydraulic block (210) configured to selectively transmit the pressure of the brake oil formed in the master cylinder (120) or the pump (231,232) to the wheel brakes; and a second controller (20) configured to control the auxiliary brake motor (230) when the master cylinder (120) or the first controller (10) malfunctions. The hydraulic controller (200) is provided with an auxiliary flow path to transmit the brake oil from the reservoir (110) to the pump (231, 232) directly through the auxiliary flow path.