Single-Sensor Multi-Channel Brake Pressure Control
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Solution Overview
Problem
The existing pressure control modules for motor vehicle brake systems are complex and costly due to their intricate structure, which includes separate pressure sensors and backup valves for each channel, leading to inefficiencies in undisrupted and fault conditions.
Innovation Solution
An electropneumatic pressure control module with a simplified structure, where a single pressure sensor and backup valves are used across channels, with a pressure-medium connection between control chambers, allowing for separate slip control and synchronous pressure control based on wheel speed sensors and a three-dimensional characteristic diagram for adaptive pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate pressure sensors are used for each channel, then measurement precision for each channel is improved, but device complexity increases
Solution Approach 1:
The patent connects the control chambers of multiple relay valves through a common pressure medium connection, allowing a single pressure sensor to measure the pressure in the control chamber that is common to all channels. This merging of pressure measurement points enables one sensor to serve multiple channels, reducing the number of sensors from two to one while maintaining the ability to control each channel separately through its own backup valve and electropneumatic valve unit.
Solution Approach 2:
The single pressure sensor serves a universal function by measuring the control pressure that is shared across multiple channels. The control chamber is designed to be accessible to all channels through the pressure medium connection, making the pressure measurement function universal rather than channel-specific. This allows the same sensor to provide measurement data for controlling multiple brake channels.
2Reliability
If multiple pressure sensors are installed, then reliability of pressure control is improved, but manufacturing cost increases
Solution Approach 1:
By merging the pressure measurement function across channels through a common control chamber connection, the patent reduces the total number of pressure sensors required. This consolidation lowers manufacturing costs while maintaining reliability through the redundant backup valve system that can independently control each channel using the shared pressure measurement data.
3Adaptability or versatility
If separate control systems are used for each channel, then adaptability to different wheel behaviors is improved, but device complexity increases
Solution Approach 1:
The patent segments the control function by providing separate backup valves and electropneumatic valve units for each channel, allowing independent control of each brake channel. This segmentation enables adaptive slip control for each wheel while sharing the pressure measurement infrastructure, achieving channel-specific control without duplicating the entire control system.
Solution Approach 2:
The common pressure medium connection creates a universal pressure control infrastructure that serves all channels. This universal connection allows the single pressure sensor to provide data for controlling multiple channels with different wheel behaviors, enabling adaptability without requiring separate measurement systems for each channel.
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 solution reduces complexity and manufacturing costs while enabling efficient, adaptive pressure control in both undisrupted and fault conditions, ensuring synchronized braking action and compensating for different wheel rotational behaviors without the need for multiple pressure sensors.
Implementation Method 1
a pressure sensor connected to the control chamber of the relay valve measures the working pressure generated in a working chamber of the relay valve
Implementation Method 2
the backup valves switch under spring loading into their passage position
Data Source
AI summary
An electromagnetic pressure control module for a pressure-medium-actuated brake system of a motor vehicle, having at least two channels, the module being controlled electrically in undisrupted operation and pneumatically in the event of a fault in the electrics, and also from a method for operating the electropneumatic pressure control module.