Vehicle Position Control via Steering Motor Compensation Torque
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Solution Overview
Problem
Existing vehicle control systems fail to effectively stabilize a vehicle's position during rapid speed changes, leading to tilting due to factors like tire slippage and road alignment, which is costly and time-consuming to analyze and solve.
Innovation Solution
A method involving a controller that determines rapid vehicle speed changes and tilting based on steering torque, yaw-rate, and wheel speed, providing compensation torque through a steering motor to counteract tilting, utilizing sensors like yaw-rate, torque, and wheel speed sensors to maintain vehicle stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a vehicle rapidly changes speed, then acceleration performance is improved, but vehicle tilting occurs due to tire slippage
Solution Approach 1:
The controller applies preliminary anti-action by detecting rapid acceleration conditions and proactively generating compensation torque in the opposite direction of expected tilting before significant vehicle tilt occurs. This prevents the harmful effect of vehicle tilting during rapid acceleration while maintaining acceleration performance.
Solution Approach 2:
The system uses feedback from yaw-rate sensors and steering angle sensors to continuously monitor vehicle tilting conditions during rapid acceleration. The controller adjusts compensation torque based on real-time feedback, creating a closed-loop control system that maintains vehicle position stability while allowing rapid speed changes.
2Device complexity
If conventional vehicle control systems are used, then system simplicity is maintained, but vehicle tilting during rapid acceleration cannot be effectively stabilized
Solution Approach 1:
The existing MDPS controller is enhanced with multi-functionality to perform both traditional steering control and new vehicle position stabilization functions. By integrating the tilting compensation logic into the existing controller, the system achieves improved stability without adding separate dedicated hardware systems.
Solution Approach 2:
The vehicle's existing sensors (yaw-rate sensor, steering angle sensor, accelerator pedal sensor) are utilized to provide self-service for detecting tilting conditions and generating compensation torque. The system uses already-available data from these sensors rather than requiring entirely new sensing systems.
Data Source
AI summary
The present invention relates to a method for controlling the position of a vehicle to ensure stable position of a vehicle against tilting due to a rapid change in vehicle speed. The method includes: determining whether a vehicle speed is rapidly changing in a straight direction on the basis of an extent of depression of a pedal that changes a position of a steering wheel and a change in vehicle speed; determining whether the vehicle is tilting on the basis of a change in a yaw-rate by means of the controller when the vehicle speed is rapidly changing in the straight direction; and providing compensation torque in the direction opposite the direction in which the vehicle is tilted by operating a steering motor when the controller determines that the vehicle is tilting.