Steering Torque-Based Rear Wheel Braking for Tight Vehicle Turning
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Solution Overview
Problem
Conventional vehicles are limited by mechanical steering systems, preventing further reduction of the minimum steering radius and failing to consider the driver's intention during steering, leading to increased driving burden.
Innovation Solution
A vehicle control method that determines target torque for wheels based on steering wheel torque, incorporating braking force on the inner steering side to reflect the driver's intention, thereby reducing the steering radius and burden.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional front wheel steering system is used, then the steering system has simple mechanical structure, but the minimum steering radius cannot be reduced further due to mechanical limitations
Solution Approach 1:
The patent replaces the purely mechanical front wheel steering system with a hybrid system that incorporates electronic control and braking mechanisms. By using brake force on the inner rear wheel combined with front wheel steering, the system achieves smaller minimum steering radius without requiring a completely new mechanical steering architecture.
Solution Approach 2:
The patent divides the steering function into two independent parts: front wheel steering for primary direction control and rear wheel braking for additional yaw moment generation. This segmentation allows each component to operate within its optimal range while achieving the combined effect of reduced minimum steering radius.
2Ease of operation
If steering control is performed based on gear information, engine running status, and vehicle velocity, then the control parameters are objectively measurable, but the driver's steering intention is not considered
Solution Approach 1:
The patent introduces feedback by detecting the steering wheel torque, which directly reflects the driver's steering intention. This torque signal is used to dynamically adjust the braking torque on the inner rear wheel, ensuring that the control system responds to the driver's actual intentions rather than relying solely on pre-set parameters based on vehicle state.
Solution Approach 2:
The patent changes the control parameter from objective vehicle state parameters (gear, velocity, engine status) to include the driver's subjective intention parameter (steering wheel torque). This parameter change enables the system to adapt to the driver's real-time steering requirements, reducing the driving burden by automating the braking coordination based on the driver's natural steering input.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively reduces the minimum steering radius while aligning with the driver's intent, reducing the need for frequent corrections and maintaining vehicle stability with low-cost, simple control.
Implementation Method 1
obtaining steering wheel torque existing when a driver performs a steering operation on a steering wheel
Implementation Method 2
a wheel on an inner steering side is braked based on gear information, a running status of an engine, a vehicle velocity, and the like, so that the vehicle generates an additional yaw moment
Data Source
AI summary
This application relates to the automobile field, and specifically, to a vehicle control method and apparatus, and the like. In the vehicle control method, when a steering mode of braking a rear wheel on an inner steering side is performed, target braking force of the rear wheel on the inner steering side is determined based on hand force applied when a driver performs a steering operation on a steering wheel, and steering control is performed based on the target braking force. In this way, steering control that well reflects an intention of the driver can be implemented, to avoid a case in which the driver frequently performs a driving operation to correct a traveling track of a vehicle, and reduce a driving burden. The method provided in embodiments of this application may be applied to an intelligent vehicle.