Dynamic Vehicle Speed Control for Safe Stopping Distance
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Solution Overview
Problem
Emergency braking systems for vehicles face reduced braking performance due to increased detection time in poor weather, communication delays between components, and hydraulic system deterioration, leading to longer stopping distances and potential accidents.
Innovation Solution
A method and device for determining a vehicle's maximum speed based on the status of its components, including braking, communication, and sensor systems, to ensure a stopping distance of less than or equal to a predetermined value by calculating braking and communication times, thereby ensuring safe braking and preventing accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the vehicle operates at higher speeds, then productivity and road usage efficiency are improved, but the stopping distance increases and safety is compromised when braking system deterioration or detection delays occur
Solution Approach 1:
The maximum speed limit is made dynamic rather than static. The system continuously adjusts the maximum permitted speed based on real-time status information from sensors, communication systems, and braking components. When deterioration is detected, the speed limit is reduced automatically to maintain safe stopping distances, and can be increased when conditions improve, optimizing both safety and productivity.
Solution Approach 2:
The system implements continuous feedback loops where status information from vehicle components (braking system, sensors, communication systems) is monitored and fed back to the control unit. This feedback enables real-time calculation of braking times and adjustment of maximum speed limits to ensure stopping distance requirements are met under varying operational conditions.
2Reliability
If the maximum speed is reduced to maintain safe stopping distance, then safety is improved, but productivity and road usage efficiency deteriorate
Solution Approach 1:
The system dynamically adjusts speed limits based on actual vehicle status rather than applying fixed conservative limits. By continuously monitoring component health and calculating real-time braking performance, the system maintains the highest possible speed that still satisfies stopping distance requirements, preventing unnecessary productivity loss while ensuring safety.
Solution Approach 2:
The system changes the speed parameter dynamically based on status information from various vehicle components. Rather than maintaining a constant low speed limit, the maximum speed parameter is adjusted upward or downward depending on the actual braking capability and detection performance, optimizing the trade-off between safety and productivity.
3Measurement precision
If the braking system components are monitored continuously, then detection precision is improved, but device complexity increases
Solution Approach 1:
The system uses existing multi-functional vehicle components and communication infrastructure for monitoring purposes. The control unit performs multiple functions including speed limit calculation, status information processing, and safety control, rather than requiring separate dedicated monitoring hardware. This reduces overall system complexity while maintaining detection precision.
Data Source
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AI summary
The invention relates to a method for determining a maximum speed (vmax) for a vehicle (F), having the following steps: receiving (S1) state information on a state of at least one vehicle component (4) of the vehicle (F); and determining (S2) a maximum speed (vmax) of the vehicle using the state information such that a stopping distance (dstopping) of the vehicle (F) from the detection of a hazardous condition to the standstill of the vehicle (F) is less than or equal to a specified value.