Truck Autonomous Braking Termination Logic
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Solution Overview
Problem
Conventional driver assistance systems for trucks often prematurely terminate autonomous braking, increasing the risk of collision or its severity due to issues like truck roll, yaw, and pitch affecting sensor functionality.
Innovation Solution
A vehicle driver assistance system equipped with sensors for truck speed, ahead vehicle detection, and driving data, along with an electronic controller that continues autonomous braking until the truck's speed is less than the vehicle ahead's speed, even if the detection sensor is operational but not detecting a vehicle, ensuring stable braking until the truck's kinetic energy is reduced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If autonomous braking is terminated when the sensor is operational but not detecting a vehicle, then the system responds quickly to non-collision conditions, but the braking may be prematurely terminated increasing collision risk
Solution Approach 1:
The system continuously monitors multiple parameters (sensor operational status, vehicle detection status, speed relationship between truck and vehicle ahead) and uses this feedback to dynamically adjust braking termination decisions. The controller compares real-time sensor data with predetermined criteria to determine whether to maintain or terminate braking, ensuring reliable operation while responding to changing conditions.
Solution Approach 2:
The system establishes predetermined brake-trigger driving data criteria in advance, including speed comparisons and sensor operational thresholds. By pre-defining the conditions for braking termination, the system prepares the decision-making framework beforehand, allowing rapid response when conditions are met while ensuring reliability through pre-validated termination criteria.
2Reliability
If autonomous braking continues until the truck's speed is less than the vehicle ahead's speed, then collision risk is reduced, but the braking duration is extended
Solution Approach 1:
The system uses speed as a dynamic parameter to determine braking termination. By continuously monitoring the speed relationship between the truck and the vehicle ahead, the system adjusts the braking duration based on real-time speed changes. The predetermined criterion of terminating braking when the truck's speed is less than the vehicle ahead's speed provides a clear, objective parameter-based decision rule that balances safety with operational efficiency.
3Measurement precision
If the system uses multiple sensors for speed and vehicle detection, then detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The electronic controller serves multiple functions: it processes data from speed sensors, analyzes vehicle detection sensor signals, determines speed relationships, and controls braking termination. By making the controller multi-functional, the system achieves high measurement precision through multiple sensors without proportionally increasing overall system complexity, as the same controller handles all sensing and control tasks.
Data Source
AI summary
A driver assistance system includes a sensor for sensing the speed of a first vehicle equipped with the system, a sensor for detecting a vehicle traveling ahead, a sensor for determining the speed of the vehicle ahead, at least one driving-data sensor for sensing driving data characteristics, and an electronic controller programmed to trigger autonomous braking of the first vehicle when predetermined brake-trigger driving data exist, and to end the autonomous braking when predetermined driving data for terminating braking exist. In effecting termination of autonomous braking, the electronic controller is programmed to determine whether the sensor for detecting vehicles ahead is transmitting signals (i.e., is operational) but is not detecting any vehicle traveling ahead, and, if the sensor is operational and no vehicle traveling ahead is detected, to terminate autonomous braking when the speed of the first vehicle is less than the most recently determined speed of the vehicle ahead.