Vehicle Braking Capability Assessment and Control
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Solution Overview
Problem
Current vehicle braking systems are operated under conservative assumptions, leading to premature slowing and loss of efficiency due to inadequate assessment of actual braking capability, which can result in delays and reduced route capacity.
Innovation Solution
A vehicle control system that determines the braking capability of a vehicle by activating the braking system when not required for traction or movement control, and modifies control parameters based on the determined capability to optimize speed and braking profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conservative braking assumptions are used (50% mechanical braking capability), then vehicle safety is improved, but average speed and route capacity deteriorate
Solution Approach 1:
The system performs preliminary braking capability assessment by activating the braking system at designated locations (such as train stations or specific GPS coordinates) before normal operation begins. This advance testing determines the actual braking capability, allowing the vehicle to operate with optimized braking profiles throughout the trip rather than relying on conservative assumptions, thus improving average speed while maintaining safety
Solution Approach 2:
The system implements a feedback mechanism where braking capability is tested during operation at designated locations, and the results are used to dynamically adjust braking profiles for subsequent operations. The controller continuously monitors actual braking performance and modifies control parameters accordingly, enabling the vehicle to operate at optimal speeds while maintaining safety margins based on real-time capability assessment
2Measurement precision
If braking system is activated frequently for testing, then braking capability assessment is improved, but energy consumption and wear increase
Solution Approach 1:
The system employs periodic action by activating the braking system at designated locations or intervals during operation rather than continuously. Braking capability is assessed at specific checkpoints (such as train stations or predetermined GPS coordinates) rather than constantly, which provides sufficient measurement precision while minimizing energy consumption and brake wear between assessment points
Solution Approach 2:
The system performs preliminary braking capability assessment at designated locations before normal operation begins or at the start of trip segments. This advance testing establishes the braking profile for subsequent operation without requiring frequent activation during normal cruising, thereby reducing overall energy consumption and wear while maintaining accurate capability knowledge
3Reliability
If braking is applied earlier to account for uncertainty, then safety is improved, but trip duration increases
Solution Approach 1:
The system uses feedback from actual braking capability measurements to dynamically adjust braking profiles, eliminating the need for excessive early braking. The controller modifies control parameters based on real performance data, allowing later and more efficient braking maneuvers that reduce trip duration while maintaining safety through continuous monitoring and adjustment
Solution Approach 2:
The system implements dynamic braking profiles that adapt to actual vehicle performance and route conditions rather than using static conservative assumptions. The controller continuously adjusts braking parameters based on measured capability, enabling optimized braking timing that improves trip duration while maintaining safety through real-time adaptation
Data Source
AI summary
A method for vehicle control comprises determining a braking capability of a braking system of a vehicle, and modifying application of at least one control parameter by a control system of the vehicle based on the determined braking capability. Braking capability may be determined by activating the braking system of the vehicle to apply a braking force on the vehicle, and concurrently, applying a level of tractive effort of the vehicle that is sufficient to overcome the braking force. The braking capability is determined based on the level of tractive effort.