Driving Assistance Acceleration Switching for Static Steering Shake
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Solution Overview
Problem
Existing driving assistance systems fail to address vehicle shaking during static steering, which can deteriorate ride comfort, particularly when starting a vehicle from a stopped state with a steering angle greater than a predetermined angle.
Innovation Solution
A driving assistance device that switches the acceleration limit value from a default to a lower limit when the vehicle is stopped and the steering angle exceeds a threshold, inhibiting shaking and improving ride comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the vehicle is controlled at acceleration within the upper limit value during starting from stopped state with steering angle, then the vehicle can move to target position, but the vehicle shakes and ride comfort deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the acceleration upper limit value based on vehicle operating conditions. Specifically, when the vehicle is in a stopped state with steering angle equal to or greater than a predetermined angle, the system switches to a lower acceleration limit value to prevent shaking. This conditional parameter adjustment resolves the contradiction by adapting the acceleration parameter to specific operational contexts where shaking is likely to occur.
Solution Approach 2:
The patent implements dynamics by making the acceleration limit value switchable rather than fixed. The switching unit changes the acceleration upper limit between a first value (higher) and a second value (lower) based on real-time detection of vehicle state and steering angle. This dynamic adjustment allows the system to respond to changing conditions and prevent shaking only when necessary, maintaining both mobility and comfort.
2Device complexity
If a fixed upper limit value of acceleration is used, then the control system is simple, but vehicle shaking occurs during static steering operations
Solution Approach 1:
The patent transforms the static acceleration limit into a dynamic one by introducing a switching unit that adjusts the limit based on detected vehicle conditions. The system switches between two acceleration limit values depending on whether the vehicle is stopped with large steering angle, thereby adding minimal complexity only where needed to prevent shaking.
Solution Approach 2:
The patent changes the acceleration parameter based on operating conditions. By switching between different acceleration upper limit values according to vehicle state and steering angle, the system maintains simplicity while effectively preventing shaking during critical operational phases.
3Object-affected harmful factors
If lower acceleration limit is applied during static steering, then vehicle shaking is reduced, but movement efficiency to target position decreases
Solution Approach 1:
The patent applies parameter changes conditionally, using the lower acceleration limit only during specific conditions (stopped state with large steering angle) where shaking occurs. During normal operation, the higher acceleration limit is maintained, thus preserving movement efficiency while preventing shaking only when necessary.
Solution Approach 2:
The dynamic switching between acceleration limits ensures that the lower, more comfortable limit is applied only during static steering operations, while the higher, more efficient limit is used during normal movement. This temporal and conditional differentiation maintains overall productivity while eliminating shaking during problematic phases.
Data Source
AI summary
A driving assistance device performs driving assistance of a vehicle on a basis of surrounding information collected by a plurality of sensors provided in the vehicle. The driving assistance device includes: a route calculation unit configured to calculate a movement route of the vehicle to a target position on a basis of the surrounding information from the plurality of sensors; a switching unit configured to switch settings of an upper limit value of acceleration of the vehicle between a first acceleration limit value and a second acceleration limit value smaller than the first acceleration limit value; and a movement control unit configured to move the vehicle along the movement route while controlling the vehicle at acceleration within the upper limit value set by the switching unit, wherein the switching unit sets the upper limit value of the acceleration of the vehicle to the second acceleration limit value in a case where the vehicle is stopped and a steering angle of the vehicle is equal to or more than a predetermined threshold value during control of the vehicle by the movement control unit.