Vehicle Slip Angle Control Through Front-Rear Force Distribution
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Solution Overview
Problem
Drivers often struggle to simultaneously achieve a desired yaw rate and vehicle body slip angle, leading to difficulties in steering the vehicle along a desired travel line due to excessive or insufficient steering adjustments based on line of sight differences.
Innovation Solution
A travel assistance device that adjusts braking and driving forces for the front and rear wheels to control the vehicle body slip angle, ensuring it aligns with a target slip angle by reducing or increasing forces as necessary to facilitate steering along the desired path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a travel assistance device is provided separately from a mobile phone to ensure privacy and security of personal information, then information security is improved, but device portability and user convenience deteriorate
Solution Approach 1:
The patent combines the travel assistance device with a mobile phone into a single integrated device. The mobile phone serves dual purposes: as a communication device and as a travel assistance device with contactless payment functionality, NFC capabilities, and travel service access, eliminating the need for separate physical devices while maintaining security through encrypted information storage.
Solution Approach 2:
The mobile phone is designed to perform multiple functions including contactless payment, NFC communication, travel service access, and information storage. This multi-functional approach allows one device to replace multiple specialized devices, improving portability while maintaining the security benefits of dedicated travel assistance functionality through software-based isolation and encryption.
2Ease of operation
If personal information is stored in a travel assistance device to enable convenient access, then ease of operation is improved, but information security and privacy protection deteriorate
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of encrypted storage and secure authentication protocols. Personal information is stored in the mobile phone but protected by encryption algorithms and access controls, acting as an intermediary layer between the user and the stored information. This allows convenient access through authentication while maintaining security through the intermediary encryption layer.
Solution Approach 2:
The system implements self-service security mechanisms including biometric authentication, password protection, and automatic encryption/decryption. The mobile phone's security system automatically manages information protection without requiring user intervention for each access, providing both convenience through automated authentication and security through continuous encryption protection.
3Ease of operation
If contactless payment and travel services are integrated into a mobile phone to improve convenience, then ease of operation is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent implements periodic action by enabling NFC and travel services only when needed rather than continuously running. The mobile phone activates contactless payment and travel service functionalities on-demand during relevant activities (e.g., at ticket gates, payment terminals), reducing power consumption compared to continuous operation while maintaining full functionality when required.
Data Source
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Figure 3A~4D
Figure 5~6
AI summary
A travel assistance method sets a target value of a vehicle body slip angle that is an angle from a longitudinal direction of a vehicle body to a travel direction of a vehicle, as a target slip angle, based on vehicle speed and a steering angle (S2), estimates or detects an actual slip angle that is an actual vehicle body slip angle (S3), sets a target braking/driving force by, when a sign of the vehicle body slip angle rotating in a turning direction of the vehicle is defined as positive and a sign of the vehicle body slip angle rotating in an opposite direction to the turning direction is defined as negative, correcting a required braking/driving force in such a manner as to increase a braking/driving force for a rear wheel or reduce a braking/driving force generated on a front wheel when the actual slip angle is larger than the target slip angle and correcting the required braking/driving force in such a manner as to reduce a braking/driving force for the rear wheel or increase a braking/driving force generated on the front wheel when the actual slip angle is smaller than the target slip angle, and generates the target braking/driving force in the vehicle (S4 to S6).