Steer-By-Wire Yaw Rate Control During Deceleration Turns
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Solution Overview
Problem
The rapid change in yaw rate per unit time during deceleration and turning makes it difficult for drivers to perform appropriate steering operations, leading to decreased steering easiness and accuracy.
Innovation Solution
A control device and system for a vehicle with a steer-by-wire steering apparatus that actively adjusts the change in yaw rate per unit time by modifying the gain based on vehicle deceleration and lateral acceleration, allowing for smoother steering operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the vehicle decelerates and makes a turn, then the yaw rate changes rapidly, but the steering easiness and steering accuracy decrease
Solution Approach 1:
The patent applies dynamics by making the steering actuator's control characteristics variable rather than fixed. The control device dynamically adjusts the steering actuator's response based on real-time detection of vehicle speed, steering angle, and yaw rate, modifying the steering force characteristics to match current driving conditions. This resolves the contradiction by allowing rapid yaw rate changes when needed while maintaining steering easiness through adaptive control parameters.
Solution Approach 2:
The patent changes control parameters (steering actuator force, gain values) based on detected vehicle state parameters (speed, steering angle, yaw rate). By dynamically adjusting these parameters, the system can accommodate rapid yaw rate changes during deceleration and turning without degrading steering easiness or accuracy, directly resolving the technical contradiction.
2Speed
If the vehicle decelerates and makes a turn, then the yaw rate changes rapidly, but the steering accuracy decreases
Solution Approach 1:
The patent implements feedback control by continuously detecting vehicle speed, steering angle, and yaw rate, then using this information to adjust the steering actuator's control characteristics. This closed-loop feedback mechanism ensures that even during rapid yaw rate changes, the steering accuracy is maintained by compensating for dynamic effects in real-time.
Solution Approach 2:
The system dynamically adapts control parameters based on real-time vehicle state, allowing the steering system to maintain accuracy during rapid yaw rate changes. The control device modifies steering actuator characteristics dynamically, resolving the contradiction between rapid yaw rate change and steering accuracy.
3Speed
If the steering actuator is controlled to follow target steering angle, then the yaw rate changes rapidly during deceleration, but this causes difficulty in steering operation
Solution Approach 1:
The patent changes the control parameters of the steering actuator based on detected vehicle state (speed, steering angle, yaw rate). During deceleration and turning, the system adjusts parameters to allow rapid yaw rate changes while simultaneously modifying the steering actuator's force characteristics to maintain steering operation ease, resolving the contradiction.
Solution Approach 2:
The control device dynamically modifies the steering actuator's control characteristics rather than using fixed parameters. This dynamic adaptation allows the system to achieve rapid yaw rate changes when needed while preventing steering operation difficulty through real-time parameter adjustment.
Data Source
AI summary
A control device, a control method, and a control system according to the present invention each actively allow an amount of change in a yaw rate, which is generated in the vehicle in response to a steering operation, per unit time to be changed in a vehicle including a steer-by-wire steering apparatus on the basis of a first physical quantity related to operation information on a steering operation input device and a second physical quantity related to acceleration and deceleration of the vehicle. This makes it possible to increase the steering easiness or increase the steering accuracy.