Vehicle Behavior Control Device Vertical Load Adjustment
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Solution Overview
Problem
Conventional vehicle behavior control systems often result in a strong feeling of intervention for drivers due to automatic acceleration or deceleration, compromising responsivity and stability, and fail to improve vehicle attitude and riding comfort effectively.
Innovation Solution
A vehicle behavior control device that increases the vertical load on the front road wheel when the steering speed exceeds a threshold, synchronizing with lateral load shifts to enhance cornering force and responsivity, thereby reducing the need for correction steering and improving stability and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If automatic acceleration or deceleration is applied to suppress vehicle behavior instability, then vehicle stability is improved, but the driver experiences a strong feeling of control intervention
Solution Approach 1:
The patent extracts the harmful automatic acceleration/deceleration control from the system and replaces it with a passive vertical load adjustment mechanism. By removing the active force application that causes driver discomfort while retaining the stability enhancement through load redistribution, the system resolves the contradiction between stability and driver control feeling.
Solution Approach 2:
The patent introduces vertical load adjustment as an intermediary mechanism between the driver's steering input and the vehicle's dynamic response. Instead of directly applying acceleration or deceleration forces that the driver can feel, the system uses vertical load changes on the front road wheels as a mediating factor to achieve stability enhancement without compromising driver control perception.
2Ease of operation
If control gain is reduced to suppress feeling of control intervention, then driver control feeling is improved, but advantageous effects of acceleration or deceleration control are reduced
Solution Approach 1:
The patent changes the control parameter from longitudinal force (acceleration/deceleration) to vertical load. By adjusting the vertical load parameter on the front road wheels instead of applying longitudinal forces, the system maintains control effectiveness for stability enhancement while avoiding the harmful side effect of driver-perceptible control intervention. This parameter substitution resolves the contradiction between control effectiveness and driver comfort.
3Manufacturing precision
If conventional control focuses on matching expert driver motion, then vehicle motion accuracy is improved, but responsivity and linear feeling with respect to steering wheel operation are not improved
Solution Approach 1:
The patent applies preliminary vertical load increase to the front road wheels before the vehicle completes the steering maneuver. By pre-adjusting the vertical load in anticipation of the steering input, the system enhances the cornering force availability and improves the linear feeling and responsivity of the vehicle response to steering wheel operations, rather than merely matching expert driver motion patterns.
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 solution enhances vehicle responsivity and linear feeling during steering operations without strong control intervention, improving vehicle stability and riding comfort by accurately matching driver intentions and reducing unnecessary corrections.
Implementation Method 1
increasing a vertical load on the front road wheel when an amount of lateral load shift of the front road wheel is increased in accordance with an increase in lateral acceleration
Data Source
AI summary
There is provided a vehicle behavior control device capable of improving responsivity of a vehicle behavior and a linear feeling with respect to a steering wheel operation without causing a driver to experience a strong feeling of intervention of the control and, at the same time, capable of controlling behavior of a vehicle in such a manner as to also improve stability of the vehicle attitude and riding comfort. In a vehicle behavior control device applied to a vehicle 1 having steerable front road wheels 2, the vehicle behavior control device includes a PCM 14 which acquires a steering speed of the vehicle, and increases a vertical load on the front road wheels when the steering speed becomes equal to or greater than a given threshold TS1 which is greater than zero.