Autonomous Vehicle Braking Control Under Sensor Failure
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Solution Overview
Problem
Autonomous vehicles face accidents due to failures in braking-related sensors, such as gravity sensors or braking hydraulic sensors, which can lead to inaccurate braking and inability to convert to manual driving.
Innovation Solution
A method where a host autonomous vehicle requests deceleration information from a nearby aid vehicle when a braking-related sensor fails, allowing the host vehicle to accurately determine and apply braking hydraulic pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the autonomous vehicle relies on its own braking-related sensors (G sensor, braking hydraulic sensor), then the vehicle can independently detect deceleration and apply braking hydraulic pressure, but when these sensors fail, the vehicle cannot accurately determine braking hydraulic pressure and may cause accidents
Solution Approach 1:
The patent introduces an intermediary vehicle as a mediator to provide sensor information when the host vehicle's sensors fail. The intermediary vehicle acts as an external sensor extension, transmitting its sensor data (G-sensor, braking hydraulic sensor, wheel speed sensor) to the host vehicle through wireless communication, thereby maintaining braking functionality without adding redundant sensors to the host vehicle
Solution Approach 2:
The patent makes the vehicle-to-vehicle communication system multi-functional by enabling it to serve both normal communication purposes and emergency sensor information transmission. The same communication infrastructure is used for both routine data exchange and critical backup sensor data transmission, avoiding the need for dedicated emergency hardware
2Measurement precision
If the autonomous vehicle requests sensor information from another vehicle, then the vehicle can obtain replacement sensor information to accurately determine braking hydraulic pressure, but this requires additional communication protocols and data processing
Solution Approach 1:
The patent creates a virtual copy of the failed sensor system by receiving and using sensor data from the intermediary vehicle. Instead of physically duplicating sensors, the system copies the functional output of the sensors through data transmission, allowing the host vehicle to reconstruct the necessary measurement information for braking control
Solution Approach 2:
The patent transforms the problem from measuring physical parameters directly (using failed sensors) to transmitting and processing data parameters through communication channels. The sensor information is converted into transmittable data packets that can be received and processed by the host vehicle's controller, changing the physical measurement problem into a data processing problem
3Adaptability or versatility
If the autonomous vehicle uses sensor information from another vehicle, then the vehicle can maintain braking functionality during sensor failure, but the vehicle must rely on external vehicles which may not always be available
Solution Approach 1:
The patent implements a dynamic braking control system that automatically switches between using its own sensor data and using intermediary vehicle data based on sensor status. The system dynamically adjusts its information source selection, transitioning from self-reliance to external reliance only when necessary, and the controller continuously monitors sensor functionality to determine when to activate the intermediary vehicle data mode
Data Source
AI summary
In a braking control method of responding to sensor failure for autonomous vehicles, when a braking-related sensor, such as a G sensor or a braking hydraulic sensor, has failed while driving of an autonomous vehicle, the host vehicle requests a nearby another autonomous vehicle determine a deceleration of the host vehicle and transmit deceleration information to the host vehicle. The host vehicle accurately determines a braking hydraulic pressure based on the deceleration information received from the aid vehicle and apply the accurate braking hydraulic pressure to a braking device. In the present manner, even in the case in which it is difficult to convert the vehicle to manual driving, the host vehicle is able to drive to a destination or a safe place.