Hydraulic Brake Isolating Valves for Pedal Feel
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Solution Overview
Problem
Existing hydraulic brake systems lack complete hydraulic isolation between pressure generation units, leading to potential repercussions and negative effects on pedal feel due to pressure peaks, and they often require complex modifications to achieve redundancy and flexibility.
Innovation Solution
The hydraulic brake system incorporates isolating valves that provide complete hydraulic isolation between the first and second pressure generation units, allowing for active pressure adjustment and redundancy, with the second pressure generation unit connected to a hydraulic accumulator and pump for regenerative braking and safety, and a pedal simulator for improved driver experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isolating valves are integrated into the hydraulic unit, then hydraulic isolation between pressure generation units is achieved, but device complexity and installation flexibility are reduced
Solution Approach 1:
The isolating valves are separated from the hydraulic unit and installed independently in the hydraulic connection between the plunger and the unit. This segmentation allows the valves to provide complete hydraulic isolation without modifying the internal structure of the hydraulic unit, thereby maintaining device simplicity and installation flexibility while achieving reliable isolation.
2Reliability
If isolating valves with non-return valves are used, then hydraulic isolation is provided, but pressure build-up repercussions affect pedal feel
Solution Approach 1:
The non-return valves are removed from the isolating valve assembly. The isolating valves are designed to provide complete hydraulic isolation without any parallel non-return valve connections. This extraction eliminates the source of pressure build-up repercussions that would otherwise travel back through the plunger to affect pedal feel, while maintaining the isolation function.
3Reliability
If standard hydraulic units are modified to include isolating valves, then hydraulic isolation is achieved, but manufacturing synergy and installation flexibility are reduced
Solution Approach 1:
The isolating valves are designed as separate, externally installable components rather than being integrated into the hydraulic unit itself. This allows standard hydraulic units to be manufactured without modification, preserving manufacturing synergy effects, while still enabling complete hydraulic isolation through the separately installed valves.
4Device complexity
If hydraulic connection between pressure generation units is maintained, then system simplicity is preserved, but pressure peaks and repercussions negatively affect driver experience
Solution Approach 1:
The isolating valves serve as intermediary components installed in the hydraulic connection between the plunger and the hydraulic unit. These valves provide complete hydraulic isolation when closed, preventing pressure peaks and repercussions from affecting pedal feel, while allowing the system to maintain relative simplicity through the use of straightforward valve components rather than complex integrated solutions.
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 ensures safe and flexible operation by preventing pressure repercussions, maintaining pedal feel, and providing redundant pressure supply, enhancing safety and ease of use by isolating the driver from pulsing effects and allowing for regenerative braking adaptation.
Implementation Method 1
the first pressure generating unit is connected to the second pressure generating unit via first interrupting means such that it can be hydraulically interrupted... When the first interrupting means is in the closed position, a hydraulic connection between the first pressure-generating unit and the second pressure-generating unit is no longer possible
Implementation Method 2
A realization of the first brake pressure generation unit can be a plunger that can actively shift the volume of brake fluid and thus build up pressure
Implementation Method 3
The second pressure generating device has a hydraulic delivery device which is connected to the hydraulic accumulator and which is part of the second pressure generating device
Implementation Method 4
The first interrupting means can be connected to a hydraulic accumulator of the second pressure generating device via the hydraulic connection of the second brake pressure generating device... advantageously enables pressure equalization during regenerative braking
Data Source
Figure 1
AI summary
A hydraulic braking system and a method for operating the hydraulic braking system. The hydraulic braking system has a first pressure generating unit and a second pressure generating unit. The first pressure generating unit is hydraulically interruptibly and uncircumventably connected to the second pressure generating unit via a first interrupting element in such a way that with the first interrupting means in a closed position, a hydraulic connection between the first and second pressure generating unit is no longer possible.