Vehicle Attitude Control Thresholding for Faulty Behavior Sensors
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Solution Overview
Problem
Existing on-vehicle control devices face challenges in suppressing control interventions based on incorrect values from behavior sensors, particularly due to temporary faults caused by high temperature, vibration, or noise, which can lead to unintended actions like brakes being applied.
Innovation Solution
An on-vehicle control device that includes a control unit which prohibits control based on behavior sensor values exceeding a threshold, and a travel environment determination unit that adjusts this threshold based on image information from a camera, determining the travel environment to prevent such interventions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control intervention is performed based on behavior sensor values, then vehicle attitude control is achieved, but unintended control actions occur when sensors input incorrect values due to temporary faults
Solution Approach 1:
The threshold for determining whether to perform control intervention is made dynamic rather than fixed. The control unit adjusts the threshold based on travel environment information (such as vehicle speed, road conditions) to adaptively respond to sensor value variations. When the environment indicates low risk, a higher threshold allows control intervention; when risk is high, a lower threshold suppresses intervention, preventing unintended actions from incorrect sensor values.
Solution Approach 2:
Travel environment information acts as an intermediary between the behavior sensor and the control unit. Instead of directly using sensor values for control decisions, the system introduces environmental context as a mediating factor. This intermediary helps distinguish between legitimate sensor readings requiring control and incorrect values caused by temporary faults, thereby improving control reliability without sacrificing necessary interventions.
2Object-affected harmful factors
If a fixed threshold is used to prohibit control based on behavior sensor values, then control intervention is suppressed when values exceed the threshold, but legitimate control actions may be prevented
Solution Approach 1:
The threshold is transformed from a static fixed value to a dynamic variable that changes according to travel environment conditions. During normal driving conditions, the threshold is set higher to allow control interventions. During conditions prone to sensor faults (high temperature, vibration), the threshold is lowered to suppress interventions, thus adapting the system's responsiveness to environmental factors.
Solution Approach 2:
The system changes the threshold parameter based on environmental parameters such as vehicle speed, road surface conditions, and weather. By dynamically adjusting this critical parameter, the system achieves both suppression of harmful control interventions and maintenance of necessary control responsiveness, resolving the contradiction between safety and adaptability.
Data Source
AI summary
An on-vehicle control device includes: a control unit that controls an attitude of a vehicle based on a value of a behavior sensor that detects a behavior of the vehicle, and prohibits control based on the behavior sensor when the value of the behavior sensor exceeds a threshold; and a travel environment determination unit that determines a travel environment of the vehicle based on image information captured by a camera, and in which the control unit changes the threshold to a lower value based on the travel environment determined by the travel environment determination unit.