Integrated Reservoir Electrohydraulic Brake Module
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Solution Overview
Problem
In electrohydraulic brake systems, especially in highly automated driving, there is a risk of prolonged time before the driver can take over braking due to the failure of the pressure provision device, leading to insecure hose connections and unfavorable packaging in auxiliary modules.
Innovation Solution
Integrating a reservoir for brake fluid into the hydraulic unit of the auxiliary module, with electric pumps driven by a common motor, allows for reliable brake pressure build-up and compact packaging, reducing the risk of fluid availability issues and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate brake fluid reservoir tank is used in the auxiliary module, then the brake system can provide backup pressure build-up capability, but the hose connections become insecure and packaging becomes unfavorable
Solution Approach 1:
The patent merges the brake fluid reservoir with the hydraulic unit by integrating the reservoir directly into the housing of the hydraulic unit. This eliminates the need for separate hose connections between the reservoir and hydraulic unit, thereby improving connection security and simplifying packaging while maintaining the backup pressure build-up capability.
Solution Approach 2:
The reservoir is nested within the housing of the hydraulic unit, with the reservoir positioned inside the same housing structure that contains the hydraulic components. This nested arrangement eliminates external connections and creates a compact, integrated assembly that resolves the packaging and connection security issues.
2Reliability
If the auxiliary module is designed with external fluid tanks, then backup braking function can be provided, but the packaging and installation become inconvenient
Solution Approach 1:
By combining the reservoir and hydraulic unit into a single integrated assembly, the patent creates a compact module that is easier to package and install. The merged design eliminates the need for separate mounting of reservoir and hydraulic unit, simplifying installation procedures and improving ease of operation.
3Ease of manufacture
If hose connections are used to connect the reservoir to the hydraulic unit, then the brake system can be assembled, but the connections become insecure
Solution Approach 1:
The patent eliminates hose connections by integrating the reservoir directly into the hydraulic unit housing. The brake fluid is transferred internally through integrated passages within the housing structure, eliminating external hose connections and their associated security risks while maintaining assembly capability.
Solution Approach 2:
By nesting the reservoir within the hydraulic unit housing with internal fluid passages, the patent creates a leak-free integrated structure that eliminates the insecurity of external hose connections while preserving the ability to manufacture and assemble the unit.
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 integrated reservoir and pump system ensures reliable brake pressure build-up and increased safety by eliminating the need for external fluid tanks, improving packaging and installation convenience.
Implementation Method 1
a pump (96, 98) which can build up pressure in a brake circuit (200, 204) by means of a pump action
Implementation Method 2
a closure element (286, 288) which closes the opening (120a, 130a) of the reservoir (120, 130)
Data Source
AI summary
An auxiliary module for an electrohydraulic brake assembly, in particular for use in highly automated driving, including a hydraulics unit with a pressure provision device for building up pressure in at least two brakes, wherein at least one reservoir for brake fluid is integrated into the hydraulics unit, and a brake assembly system having an auxiliary module.