Hydraulic Brake Consumer Pressure Regulation via Segmentation
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Solution Overview
Problem
Existing brake-by-wire systems lack precise regulation of pressure across consumers, leading to inefficiencies in setting target brake pressures, particularly in 'brake-by-wire' operating modes where fine-tuned control is necessary.
Innovation Solution
A method that assigns consumers to groups based on pressure-volume relationships, using an open inlet valve for the first group to connect to the pressure supply and controlling the inlet valve of a selected consumer in the second group to build up pressure precisely, with volume-controlled regulation to achieve user-specific setpoint pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all consumers are connected to the pressure supply device via open inlet valves, then all consumers receive system pressure simultaneously, but precise pressure regulation for individual consumers cannot be achieved
Solution Approach 1:
The patent segments consumers into two groups: first group consumers remain connected to the pressure supply device via open inlet valves for rapid pressure equalization, while second group consumers have their inlet valves closed and are served individually. This segmentation enables both fast pressure setting for most consumers and precise individual regulation for selected consumers.
Solution Approach 2:
Instead of regulating all consumers simultaneously (excessive action), the patent applies partial action by selecting only one consumer at a time from the second group for regulated pressure buildup. This partial approach to regulation improves precision for the selected consumer while maintaining overall system efficiency.
2Measurement precision
If the inlet valve of a selected consumer is opened in a controlled manner to build up pressure, then precise pressure setting is achieved, but the process takes more time compared to simultaneous pressure supply
Solution Approach 1:
By dividing consumers into two groups with different treatment, the patent achieves precise pressure control for selected consumers without requiring all consumers to undergo time-consuming regulated pressure buildup. The first group consumers receive rapid pressure equalization while the second group receives precision regulation on demand.
Solution Approach 2:
The system pre-establishes pressure-volume relationships for all consumers in advance, enabling the control unit to calculate and execute precise pressure regulation without time-consuming real-time measurements. This preliminary characterization allows fast, accurate pressure control when needed.
3Manufacturing precision
If volume-controlled regulation is carried out based on pressure-volume relationships, then accurate pressure medium intake volume is achieved, but complex calculations and control are required
Solution Approach 1:
The patent determines pressure-volume relationships for all consumers in advance and stores them in the control unit. This preliminary action eliminates the need for complex real-time calculations during pressure regulation, as the control unit can directly use pre-stored data to achieve accurate volume control.
Solution Approach 2:
The system uses feedback from pressure sensors and pre-determined pressure-volume relationships to calculate and adjust the pressure medium intake volume. This feedback mechanism enables accurate volume control by continuously comparing actual pressure with target pressure and adjusting the inlet valve accordingly.
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 approach allows for precise and efficient regulation of brake pressures across consumers, ensuring accurate pressure setting and balancing, enhancing the control and reliability of brake systems in both 'brake-by-wire' and fallback modes.
Implementation Method 1
a pressure supply device (101) which can release or take up a pressure medium volume (V) in a regulated manner, with an electrically controllable inlet valve (EVi) for each consumer (VB1-VB4)
Implementation Method 2
a check valve that opens in the direction of the pressure supply device is connected in parallel with the inlet valves
Data Source
Figure 1
Figure 2
AI summary
A method for operating a hydraulic system with a plurality of consumers (VBi, 8-11) an electrically controllable pressure supply device (101, 5) and an electrically actuable inlet valve (EVi, 6a-6d), per consumer, which inlet valve (EVi, 6a-6d) is arranged between the pressure supply device (101, 5) and the consumer, wherein a pressure/volume relationship (Fi) is predefined or determined for each consumer (VBi, 8-11), wherein each consumer (VBi, 8-11) is assigned to a first group (A) or a second group (B) of consumers, wherein the first group (A) of consumers comprises at least one consumer, and wherein, in order to set predefined consumer-specific setpoint pressures (Pi Setp), the first group (A) of consumers (VB1, VB2) is connected via the respectively opened inlet valve (EV1, EV2) to the pressure supply device (101, 5), and the inlet valves (EV3, EV4) of the consumers (VB3, VB4) of the second group (B) are closed, wherein the inlet valve (EVb1) of a single, selected consumer (VBb1) of the second group (B) is opened while being regulated to build up a pressure, and a brake system for motor vehicles.