Electropneumatic ABS Brake Pressure Sensing for Fault Detection
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Solution Overview
Problem
Existing ABS brake systems for utility vehicles require complex setups and additional sensors for reliable brake control, leading to high implementation costs and limited flexibility for retrofitting and updating.
Innovation Solution
An electropneumatic ABS brake system with two pressure sensors, one measuring driver brake pressure directly and the other measuring trailer brake pressure, allowing for direct comparison and closed-loop control, enabling efficient calibration and fault detection with minimal additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single pressure sensor is used to measure brake pressure, then the system structure is simple, but reliable brake control cannot be achieved
Solution Approach 1:
The patent introduces a second pressure sensor as an intermediary measurement device to verify and cross-check the measurements from the first pressure sensor. This intermediary sensor enables fault detection and ensures reliable brake control without requiring complete system redesign, thereby resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent implements a feedback mechanism where the electronic control unit continuously compares pressure signals from both sensors. When deviations or faults are detected, the system can trigger warnings or switch to alternative control modes, ensuring reliable brake control through continuous monitoring and feedback while maintaining manageable system complexity.
2Reliability
If multiple sensors are added for reliable measurement, then measurement reliability improves, but implementation costs increase
Solution Approach 1:
The patent enables the brake system to perform self-diagnosis and self-verification by comparing measurements from multiple sensors. This self-service capability allows the system to detect faults and ensure measurement reliability using existing components and control logic, reducing the need for additional expensive specialized equipment while maintaining high measurement reliability.
3Measurement precision
If complex sensor setups are used, then brake control accuracy improves, but retrofitting flexibility is reduced
Solution Approach 1:
The patent segments the measurement function by using two separate pressure sensors that can be independently installed and calibrated. This segmentation allows the sensors to be added or modified independently in retrofitting scenarios, maintaining measurement precision while preserving flexibility for different vehicle configurations and retrofitting requirements.
4Reliability
If additional components are added for fault detection, then system reliability improves, but device complexity increases
Solution Approach 1:
The patent makes the second pressure sensor serve multiple functions: it acts as a redundant measurement device for fault detection, provides cross-verification for the first sensor, enables closed-loop control, and supports various braking modes (service braking, parking braking, emergency braking). This multi-functionality improves system reliability without proportionally increasing component complexity, as one component performs multiple critical roles.
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 system provides reliable brake control with reduced complexity and cost, enhanced flexibility for retrofitting, and improved reliability through direct measurement and comparison of pressure signals, facilitating efficient calibration and fault detection.
Implementation Method 1
A pressure sensor is often provided for measuring the modulated brake pressure. Here, the pressure sensor can be used to detect the modulated brake pressure and make it available to the electronic control unit
Data Source
AI summary
An electropneumatic ABS brake system is for a utility vehicle. The brake system has: a foot brake valve operable via a brake pedal and including pneumatic output channels, axle service brake circuits connected to the output channels and each having an axle valve unit and ABS valves for actuating wheel service brakes, a control unit for actuating the ABS valves and the axle valve units, and a first pressure sensor connected to one of the two pneumatic output channels and configured to measure the pneumatic control pressure output by the foot brake valve and to output a first pressure signal to the control unit. A second pressure sensor is provided separately from the first sensor and is configured to output a second pressure signal to the control unit, which receives the two pressure signals and actuates the ABS valves and/or the axle valve units as a function of the signals.