Active Suspension Slip Control for Shorter Vehicle Braking
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Solution Overview
Problem
Current braking systems for vehicles rely on frictional forces between tires and the road, which can be inefficient due to variations in slip ratios and normal loads on wheels, leading to suboptimal braking distances and times, especially during dynamic maneuvers like rapid braking or acceleration.
Innovation Solution
An active suspension system that controls slip ratios by dynamically adjusting normal loads on wheels using actuators, based on real-time data from sensors such as wheel speed and accelerometers, to maintain optimal traction and minimize braking distance and time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional friction-based braking systems are used, then braking function is provided, but braking distance and time are suboptimal due to variations in slip ratios and normal loads
Solution Approach 1:
The patent applies dynamics by making the normal load on the wheel dynamically adjustable through the active suspension actuator. The system continuously monitors slip ratio and adjusts the normal load in real-time to maintain optimal braking conditions, transforming a static braking system into a dynamic one that adapts to changing wheel slip conditions
Solution Approach 2:
The system changes the parameter of normal load on the wheel by controlling the active suspension actuator. By varying the normal load parameter based on detected slip ratio, the system optimizes the frictional force and braking efficiency, directly addressing the suboptimal braking performance caused by fixed normal loads
2Productivity
If active suspension system adjusts normal loads dynamically, then braking efficiency is improved, but system complexity increases
Solution Approach 1:
The patent applies universality by enabling the active suspension system to perform multiple functions: it continues to provide suspension support while simultaneously optimizing braking performance through slip ratio control. This multi-functionality reduces the need for separate dedicated braking optimization components, thereby limiting the increase in system complexity
Solution Approach 2:
The system applies self-service by using the existing active suspension actuators and control infrastructure to automatically adjust normal loads for braking optimization. The control system monitors wheel slip and autonomously commands the actuators without requiring additional manual intervention or complex external control systems
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 active suspension system effectively manages slip ratios and normal loads to maximize frictional force, thereby reducing braking distance and time while maintaining traction, even under dynamic conditions.
Implementation Method 1
Braking of a moving vehicle generally relies on frictional forces present between the road surface and one or more tires of the vehicle. The magnitude of these frictional force, and therefore the distance and/or time required for a moving vehicle to come to a stop, may be influenced by a dynamic slip ratio of each wheel of the vehicle.
Implementation Method 2
applying, with an actuator of the active suspension system, a force to a wheel assembly that includes the wheel, thereby increasing a normal load applied to the wheel
Data Source
AI summary
System and method for improving braking efficiency by increasing the magnitude of a frictional force between a tire of a vehicle wheel and a road surface. Braking efficiency may be improved by controlling the normal force applied on the wheel, with an active suspension actuator, based on the wheel's slip ratio.