Front-Rear Torque Constraint Control for Vehicle Pitch Suppression
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Solution Overview
Problem
Existing vehicle control systems face challenges in effectively suppressing pitching behavior, which can lead to discomfort and anxiety for occupants, especially on uneven road surfaces and with varying cargo loads, often requiring complex configurations and potentially causing unnecessary acceleration or deceleration.
Innovation Solution
A vehicle behavior control device that includes a front and rear wheel differential rotation constraining member, which increases its constraining force in response to pitching behavior, thereby enhancing the internal circulation torque between the front and rear wheel driving force transmission mechanisms to suppress suspension stroke and pitching behavior, utilizing a simple configuration without additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional hardware is added to suppress pitching behavior, then pitching suppression effectiveness is improved, but device complexity increases
Solution Approach 1:
The existing front and rear wheel differential rotation constraining member, originally designed for traction control, is made to serve dual purposes: maintaining its original function while also suppressing pitching behavior through controlled force increase during pitch events
Solution Approach 2:
The control system utilizes data from existing sensors (acceleration sensors, suspension stroke sensors) and the vehicle's own dynamic response to automatically adjust the constraining force, making the system self-regulating without external intervention or additional dedicated hardware
2Stability of the object's composition
If constraining force is increased to suppress pitching, then pitching amplitude is reduced, but turning performance may deteriorate
Solution Approach 1:
The constraining force is made dynamically adjustable based on real-time detection of vehicle state (straight travel vs. turning), allowing the system to optimize performance for the current operating condition rather than maintaining a fixed force level
Solution Approach 2:
Different constraining force levels are applied based on the local operating condition: high constraining force during straight travel for pitch suppression, and reduced force during turning to maintain maneuverability
3Measurement precision
If complex control systems are used to suppress pitching, then pitching suppression precision is improved, but ease of operation deteriorates
Solution Approach 1:
The system continuously monitors vehicle acceleration and suspension stroke to detect pitching behavior, then feeds this information back to automatically adjust the constraining force, creating a closed-loop control that is both precise and automated
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 effectively reduces the amplitude of pitching behavior, bringing it closer to a normal state, while optimizing constraining force during straight travel to improve turning performance and reduce discomfort, all without the need for new hardware.
Implementation Method 1
enhancing the internal circulation torque between the front and rear wheel driving force transmission mechanisms to suppress suspension stroke and pitching behavior
Data Source
AI summary
A vehicle behavior control device is provided in a vehicle that includes a suspension device supporting a wheel so as to allow a stroke with respect to a vehicle body, and having a geometry in which a center of the wheel is displaced in a direction in which a wheelbase stretches and contracts due to the stroke, and a front and rear wheel differential rotation constraining member that constrain differential rotation between a front wheel driving force transmission mechanism that transmit a driving force to front wheels and a rear wheel driving force transmission mechanism that transmit a driving force to rear wheels. The vehicle behavior control device includes a front and rear wheel differential rotation constraining control unit that increase a constraining force of the front and rear wheel differential rotation constraining member in response to occurrence of a pitching behavior of the vehicle body.