Cruise Assist Steering Input Detection Disturbance Filtering
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Solution Overview
Problem
Conventional cruise assist systems face inaccuracies in determining whether a vehicle occupant is holding the steering wheel due to disturbances from road irregularities, which can lead to erroneous determinations.
Innovation Solution
A cruise assist system and method that utilize physical quantities related to the steering shaft's rotational movement to differentiate between the occupant's input and disturbance inputs, using techniques such as lowpass filtering and system identification to improve accuracy in determining the occupant's physical input, thereby enhancing the reliability of holding determinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If actual steering torque is used to determine whether an occupant is holding the steering wheel, then the determination process is simple, but the determination accuracy deteriorates due to disturbance inputs from road irregularities
Solution Approach 1:
The patent segments the actual steering torque into two distinct components: occupant input torque and disturbance torque. This is achieved through mathematical modeling that separates the torque signal based on the physical relationship between steering shaft rotational acceleration and torque, allowing independent analysis of each component to improve determination accuracy
Solution Approach 2:
The patent extracts the disturbance torque component from the actual steering torque using a disturbance torque calculator. By isolating and removing the disturbance component (caused by road irregularities and vehicle vibrations), the system obtains a cleaner occupant input torque signal for more accurate holding determination
2Measurement precision
If disturbance input is reduced from the first type physical quantity, then the occupant's physical input detection accuracy is improved, but the device complexity increases due to additional processing requirements
Solution Approach 1:
The patent implements feedback by using the detected occupant physical input to adjust and refine the determination of whether the occupant is holding the steering wheel. The system continuously monitors the physical quantity, compares it against thresholds, and provides feedback control to the cruise assist function, creating a closed-loop system that improves accuracy through iterative refinement
Data Source
AI summary
In a cruise assist system, a turning angle controller executes at least one of an automatic cruise control task that automatically controls a turning angle of the vehicle, and an assist control task that controls the turning angle of the vehicle in accordance with an occupant's operation of the steering wheel. A holding determiner includes an input detector detecting an occupant's physical input to a steering shaft via a steering wheel based on at least one of a first type physical quantity and second type physical quantities. Each of the first and second physical quantities depends on rotational movement of the steering shaft. The first type physical quantity contains the occupant's physical input, and a disturbance input, which is different therefrom, to the steering shaft. The second type physical quantities have a physical relationship therebetween, which is changed depending on the occupant's physical input.