Brake-by-Wire Controller Sensor Failure Handling
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Solution Overview
Problem
The challenge lies in safely controlling a vehicle equipped with a brake-by-wire (BBW) device when a sensor fails, as this can lead to instability due to incorrect wheel control, particularly during steering and braking maneuvers.
Innovation Solution
A control system for BBW devices that includes sensors to detect operating states, controllers to determine sensor failures, and a mechanism to turn off affected BBW devices, allowing for adaptive braking and suspension control based on the vehicle's traveling state, prioritizing stability through electro-mechanical brakes and active suspension systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor fails in a BBW device, then the BBW device can still operate, but the controller cannot confirm the wheel state leading to difficulty in controlling the vehicle
Solution Approach 1:
The controller continuously monitors sensor data from all BBW devices to detect failures. When a sensor failure is detected, the controller receives feedback about the failed sensor's identity and adjusts control strategies accordingly, using data from other functional sensors to infer the state of the failed sensor's wheel.
Solution Approach 2:
The controller acts as an intermediary that processes information from multiple sensors and other vehicle systems (such as steering angle sensors, yaw rate sensors) to compensate for the missing wheel state information from a failed sensor, enabling continued vehicle control through indirect inference.
2Productivity
If the controller continues to control a wheel with a failed sensor, then control actions can be executed, but incorrect control based on faulty data causes vehicle instability
Solution Approach 1:
The controller proactively detects sensor failures and preemptively adjusts control strategies to prevent incorrect control actions. By identifying the failed sensor before it causes instability, the controller can switch to alternative control modes that maintain vehicle stability without relying on the faulty sensor data.
Solution Approach 2:
The control system dynamically adapts its behavior based on the detected sensor failure. The controller switches between different control strategies depending on which sensors are functional, adjusting control execution in real-time to maintain vehicle stability while preserving control capability through flexible adaptation to the degraded sensor configuration.
3Device complexity
If the BBW device configuration is simplified using electro-mechanical brakes, then the device structure is reduced, but the system becomes more sensitive to sensor failures
Solution Approach 1:
The controller is designed with multi-functionality to handle both normal operation and sensor failure conditions. It can execute standard braking control during normal operation and automatically switch to failure-tolerant control modes when sensor failures are detected, making the system adaptable to multiple operational states without requiring additional hardware.
Solution Approach 2:
The control system changes its operational parameters and control strategies based on the detected sensor failure condition. When a sensor failure is detected, the controller modifies control parameters such as braking force distribution, control update frequency, and data fusion weights to maintain reliable vehicle control despite the simplified BBW configuration and reduced sensor availability.
Data Source
AI summary
A control system of a BBW device may include brake-by-wire (BBW) devices provided to each of wheels of a vehicle to perform a braking control or a suspension control of the vehicle, sensors configured for detecting an operating state of each of the BBW devices, and controllers connected to each of the BBW devices to control a corresponding BBW device among the BBW devices, in which the controllers are configured to determine whether the sensors fail according to data received from the sensors, and when determining that any a sensor among the sensors fails, the controllers turn off any a BBW device of the BBW devices which is a target detected by the failed sensor, and perform the braking control or the suspension control of the BBW devices based on a traveling state of the vehicle.