AEB Braking Control Adapted to Vehicle Mass Changes
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Solution Overview
Problem
Conventional autonomous emergency braking (AEB) systems in vehicles fail to account for significant variations in vehicle mass, leading to inadequate stopping performance when the vehicle is heavily or lightly loaded, often compromising collision avoidance by using a compromise deceleration setting.
Innovation Solution
An AEB system that adjusts deceleration values and braking commands based on real-time vehicle mass measurements, employing a mass-adjusted deceleration value to optimize braking performance by varying the timing and force of braking commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a predetermined deceleration value is set for AEB, then the system can provide consistent braking control, but the system cannot adapt to varying vehicle mass conditions leading to inadequate stopping performance
Solution Approach 1:
The patent applies dynamics by transitioning from a static, fixed deceleration value to a dynamic, adjustable deceleration value that changes based on detected vehicle mass conditions. The controller automatically modifies the deceleration parameter in real-time according to the actual load, enabling the AEB system to adapt its braking behavior to match varying vehicle mass while maintaining reliable stopping performance across different operating conditions.
Solution Approach 2:
The patent implements parameter changes by modifying the deceleration value parameter based on detected vehicle mass. When the vehicle is detected to be heavily loaded, the system increases the deceleration value to account for the longer stopping distance required. This dynamic parameter adjustment allows the AEB system to maintain optimal braking performance across the full range of vehicle mass variations without requiring multiple fixed configurations.
2Speed
If the predetermined deceleration assumes a lightly loaded vehicle, then the braking response is quick, but the vehicle cannot stop in sufficient time when heavily loaded
Solution Approach 1:
The patent employs feedback by continuously monitoring vehicle mass conditions and using this information to adjust the deceleration value accordingly. The system receives feedback about the actual load state and automatically modifies its braking parameters in response, ensuring that the braking response is appropriately calibrated to the current vehicle mass. This closed-loop approach maintains both quick response when lightly loaded and sufficient stopping capability when heavily loaded.
3Reliability
If the predetermined deceleration assumes a heavily loaded vehicle, then the stopping distance is sufficient, but the vehicle stops too early when lightly loaded
Solution Approach 1:
The patent applies dynamics by making the deceleration value adjustable rather than fixed, allowing the system to optimize braking activation timing based on actual vehicle mass. When the vehicle is lightly loaded, the system uses a lower deceleration value that delays braking activation until the appropriate moment, preventing premature stopping. When heavily loaded, it increases the deceleration value to ensure sufficient stopping distance is available. This dynamic adjustment eliminates the time loss associated with overly conservative fixed deceleration settings.
Data Source
AI summary
An autonomous emergency braking system includes a sensor generating a collision risk signal indicative of an object in a path of travel of the vehicle and a controller. The controller determines whether an indication of a mass of the vehicle is present and, if so, adjusts a default deceleration value corresponding to a predetermined rate of deceleration for the vehicle in response to the mass to obtain a mass-adjusted deceleration value. The controller establishes, responsive to the mass-adjusted deceleration value, successive times for generating first and second braking commands to an engine or brake controller or increasing braking forces for the first and second braking commands configured to cause deceleration of the vehicle at first and second rates of deceleration, the second rate greater than the first. The first and second braking commands are generated responsive to the collision risk signal.