ABS Solenoid Valve Function Check for Brake Fault Detection
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Solution Overview
Problem
Existing pressure-medium operated electronic brake systems in vehicles lack effective methods to promptly identify mechanical defects in ABS solenoid control valves, leading to potential safety-critical situations due to unexpected braking behavior, and current solutions are either costly or complex.
Innovation Solution
A method for function checking the ABS solenoid control valves by temporarily activating and pressurizing them through the electronic control unit, monitoring vehicle responses, and generating warning signals for faulty valves, which can be implemented without additional costly pressure sensors, allowing for identification of mechanical malfunctions in a cost-effective manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional pressure sensors are installed to monitor brake cylinder pressure for identifying ABS valve defects, then the reliability of brake system monitoring is improved, but the device complexity and production costs increase
Solution Approach 1:
The ABS solenoid control valve performs self-diagnosis by monitoring its own operation. The method activates the valve temporarily and monitors whether the expected vehicle response occurs, allowing the valve to identify its own mechanical defects without external monitoring sensors.
Solution Approach 2:
The system uses feedback from vehicle response monitoring to detect valve malfunctions. The electronic control unit compares the actual vehicle response against expected response patterns to identify defective valves, creating a closed-loop diagnostic system without additional sensors.
2Reliability
If additional pressure sensors are installed to monitor brake cylinder pressure for identifying ABS valve defects, then the reliability of brake system monitoring is improved, but the production costs increase
Solution Approach 1:
The ABS solenoid control valve performs self-diagnosis by monitoring its own operation. The method activates the valve temporarily and monitors whether the expected vehicle response occurs, allowing the valve to identify its own mechanical defects without external monitoring sensors.
Solution Approach 2:
The system uses feedback from vehicle response monitoring to detect valve malfunctions. The electronic control unit compares the actual vehicle response against expected response patterns to identify defective valves, creating a closed-loop diagnostic system without additional sensors.
3Reliability
If the ABS solenoid control valve is temporarily activated and pressurized for function checking, then the ability to identify mechanical defects is improved, but the risk of unexpected braking behavior increases
Solution Approach 1:
The function check is performed as a preliminary action before normal braking operations. By temporarily activating the valve and monitoring the response, the system identifies potential defects in advance, preventing them from causing harmful braking behavior during actual use.
Solution Approach 2:
The electronic control unit temporarily activates the ABS solenoid control valve at predetermined intervals or under specific conditions to perform function checks. This periodic activation allows for regular monitoring of valve functionality without continuously pressurizing the system.
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 method enhances the operational safety of electronic brake systems by reliably identifying and signaling mechanical malfunctions in ABS solenoid control valves, preventing safety-critical situations and reducing production costs by avoiding the need for extensive sensor installations.
Implementation Method 1
an anti-lock braking system solenoid control valve (15, 16)... having a solenoid valve (6.1) which conducts a current pneumatic brake pressure to the anti-lock braking system solenoid control valve (15, 16) in the non-actuated state and a pneumatic supply pressure to the anti-lock braking system solenoid control valve (15, 16) in the actuated state
Data Source
AI summary
A method is for function checking of a pressure-medium operated electronic brake system of a vehicle, having a valve and sensor device, having a brake cylinder for actuating a brake, having an ABS solenoid control valve associated with the brake cylinder. For function checking of the control valve, it is temporarily activated and pressurized via the control unit and via the valve and sensor device such that pressure builds up at the input side of the control valve although a pressure increase in the associated brake cylinder is not expected, or a decrease after an interim increase is expected, and a malfunction of the anti-lock braking system solenoid control valve is identified if, contrary to expectations, a response of the vehicle due to a pressure increase in the brake cylinder, or due to the lack of a decrease after an increase, is established during this function check.