Vehicle Steering Reference Position Adjustment by Speed
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Solution Overview
Problem
Centroid-based steering assist control in vehicles can cause a sense of incongruity for drivers due to mismatch between the intuitive reference position and the vehicle centroid, especially at varying speeds, leading to discomfort during turns.
Innovation Solution
A vehicle control device that adjusts the reference position based on vehicle speed, shifting it rearward at low speeds and forward at high speeds to align with the driver's intuitive reference point, using a combination of sensors and image processing to calculate steering assist amounts and angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If centroid-based steering assist control is performed regardless of vehicle speed, then the control system is simple and consistent, but the driver feels a sense of incongruity due to mismatch between intuitive reference position and vehicle centroid
Solution Approach 1:
The reference position for steering assist control is made dynamic by shifting it according to vehicle speed. At low speeds, the reference position is shifted rearward to align with the driver's intuitive reference point (rear portion of vehicle), while at high speeds it is shifted forward. This dynamic adjustment resolves the contradiction by adapting the control reference to match driver perception across different operating conditions, eliminating the sense of incongruity without requiring complex additional hardware.
Solution Approach 2:
The patent changes the parameter of reference position based on the parameter of vehicle speed. By establishing a relationship where the reference position shifts rearward at low speeds and forward at high speeds, the system adapts to the driver's changing intuitive reference points. This parameter change approach allows the simple centroid-based control architecture to produce driver-comfortable assistance by merely adjusting the reference position parameter dynamically.
2Ease of manufacture
If the reference position is fixed at the vehicle centroid, then the control calculation is straightforward, but the assist control feels too much during low-speed turns
Solution Approach 1:
The reference position is made dynamic rather than fixed, shifting rearward when vehicle speed is low. This dynamic adjustment reduces the assist control magnitude during low-speed turns to match the driver's intuitive expectation, preventing the control from feeling excessive while maintaining relatively simple control calculations through speed-based conditional logic.
3Stability of the object's composition
If the reference position is fixed at the vehicle centroid, then the control system is consistent, but the assist control feels too much during high-speed turns
Solution Approach 1:
The reference position dynamically shifts forward when vehicle speed is high, aligning with the driver's intuitive reference point (front portion of vehicle) during high-speed turns. This maintains control system consistency through a systematic speed-based adjustment rule while preventing excessive assist control feeling by adapting the reference position to high-speed driving characteristics.
Data Source
AI summary
A vehicle control device includes: a target traveling path setting unit that sets a target traveling path of an own vehicle; a reference position setting unit that sets a reference position of the own vehicle for specifying a position of the own vehicle with respect to the target traveling path; and a control unit that controls a steering assist amount of a steering wheel, based on a positional deviation being a deviation between the target traveling path set by the target traveling path setting unit and the reference position of the own vehicle set by the reference position setting unit. The reference position setting unit changes the reference position according to a vehicle speed.