Semitrailer Emergency Braking Adapted to Road Adhesion
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Solution Overview
Problem
Current Autonomous Emergency Braking (AEB) systems use a fixed braking policy, which is inadequate for varying road surfaces and axle loads, leading to suboptimal braking performance and stability issues, particularly for semitrailers.
Innovation Solution
An emergency braking system that includes sensors to collect environmental data, determining the maximum adhesive force of the road surface and axle load information to calculate customized braking pressures for each wheel, ensuring optimal braking force distribution and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the same fixed braking pressure is applied to each wheel, then the braking system is simple to control, but the braking effect is suboptimal on different road surfaces and axle loads
Solution Approach 1:
The patent applies different braking pressures to different wheels based on their specific conditions. The braking controller calculates and applies customized braking pressures for drive axle wheels and non-drive axle wheels separately, and further adjusts pressures for individual wheels based on detected road surface adhesion characteristics. This local differentiation optimizes braking effectiveness for each wheel's specific load and surface conditions.
Solution Approach 2:
The braking system dynamically adjusts braking pressures in real-time based on detected road surface conditions and axle load information. The system transitions from static fixed pressure to dynamic adaptive pressure control, continuously monitoring wheel adhesion characteristics and modifying braking forces accordingly to maintain optimal braking performance across varying conditions.
2Stability of the object's composition
If fixed braking pressure is used, then the braking system is stable and simple, but the braking distance is too long on road surfaces with small adhesive force
Solution Approach 1:
The system changes the braking pressure parameter dynamically based on road surface adhesion characteristics. By detecting wheel adhesion forces during braking and calculating maximum adhesive forces for different road surfaces, the system adjusts braking pressures to match actual road conditions, thereby optimizing braking distance while maintaining system stability through controlled adaptation.
Solution Approach 2:
The braking system incorporates feedback mechanisms that monitor wheel adhesion characteristics in real-time during braking. The braking controller uses this feedback information to continuously adjust braking pressures, creating a closed-loop control system that adapts to changing road surface conditions and optimizes braking performance accordingly.
3Device complexity
If the same braking pressure is applied to wheels on different axles, then the braking system is simple to implement, but the vehicle stability is compromised
Solution Approach 1:
The patent implements differentiated braking pressure control for drive axle wheels and non-drive axle wheels. The braking controller calculates appropriate braking pressures separately for each axle type based on their different load characteristics and adhesion properties, then applies these customized pressures to maintain vehicle stability during braking maneuvers.
Solution Approach 2:
The braking system segments the vehicle's wheels into distinct groups (drive axle wheels and non-drive axle wheels) and applies different braking control strategies to each segment. This segmentation allows the system to account for the different mechanical and adhesive characteristics of each axle type, improving overall vehicle stability during emergency braking.
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 approach allows for more accurate and stable braking, reducing the risk of collision and ensuring steady stops by adapting to the road surface and axle load conditions, thereby enhancing safety and braking performance.
Implementation Method 1
calculate a maximum adhesive force that can be provided by a road surface the semitrailer is currently on
Implementation Method 2
determine a first braking pressure corresponding to each wheel based on the maximum adhesive force and axle load information
Data Source
AI summary
The present disclosure provides an emergency braking system, an emergency braking method and a semitrailer, capable of improving the braking effect of the vehicle, thereby achieving improved safety for the vehicle. The system includes: a sensor component configured to collect sensed information on an environment where a semitrailer is located; and a braking controller configured to determine whether there is a risk of collision for the semitrailer based on the sensed information, and if so, calculate a maximum adhesive force that can be provided by a road surface the semitrailer is currently on, determine a first braking pressure corresponding to each wheel based on the maximum adhesive force and axle load information, and transmit to a braking system a first braking instruction carrying the first braking pressure for each wheel.