Electrically Controlled Handbrake Monitoring via Negative Acceleration
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Solution Overview
Problem
Existing electrically controlled parking brake systems in commercial vehicles consume excessive energy due to frequent and unnecessary checks, which can compromise operational safety and efficiency.
Innovation Solution
Implementing a method where the parking brake system is monitored only when negative acceleration is detected, with different test routines for various scenarios (e.g., ignition on/off, manual actuation), and utilizing an emergency release device to maintain system operation and prevent rear-end collisions, while storing results for documentation and modifying test routines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parking brake system is checked frequently to ensure safety, then operational safety is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic test routines (first test routine during operation, second test routine after ignition off, third test routine after ignition on) instead of continuous monitoring. The control device triggers these tests at specific intervals and conditions, reducing energy consumption while maintaining safety through regular checks at critical moments in the vehicle's operational cycle.
Solution Approach 2:
The patent makes the testing strategy adaptive and dynamic by monitoring acceleration values and triggering the first test routine only when negative acceleration is detected. This dynamic approach adjusts the monitoring intensity based on actual driving conditions, performing comprehensive checks only when braking events occur rather than continuously, thereby reducing unnecessary energy consumption.
2Reliability
If comprehensive test routines are performed to detect faults, then reliability is improved, but time consumption increases
Solution Approach 1:
The patent divides the testing process into multiple separate test routines executed at different times and conditions: first test routine during operation (triggered by negative acceleration), second test routine after ignition off, and third test routine after ignition on. Each routine can be structured differently and focused on specific aspects, allowing comprehensive fault detection without requiring one lengthy continuous test that would consume excessive time.
Solution Approach 2:
The patent performs preliminary checks during operation through the first test routine when negative acceleration is detected. This preliminary action identifies obvious faults early during vehicle operation, allowing more comprehensive tests to be performed later when the vehicle is stationary, thereby distributing the time burden and preventing lengthy tests from delaying vehicle operation.
3Reliability
If the vehicle is prevented from operating with a defective parking brake, then safety is improved, but productivity decreases
Solution Approach 1:
The patent segments the testing and fault response process into multiple stages. The first test routine during operation provides preliminary fault detection, and if faults are detected, the vehicle can be restricted from operation. However, the second and third test routines after ignition off/on provide additional verification opportunities. This segmentation allows the system to balance safety restrictions with vehicle availability by requiring multiple test failures before permanently preventing operation.
Data Source
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AI summary
The method involves providing an electronic controller (12), an electro-pneumatic pre-control group (14) and a handbrake cylinder (16). An acceleration value of the vehicle is monitored when the value falls short of a preset negative acceleration reference value. The electrically controlled handbrake system (10) is verified by a test routine.