Electrohydraulic Antilock Brake Torque Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antilock brake systems (ABS) that minimize control circuits compromise directional control and stopping distance, either allowing one wheel to lock, reducing braking torque, or alternating between locking and unlocking, leading to suboptimal performance on varying road surfaces.
Innovation Solution
An electrohydraulic antilock brake system with a controller linked to differential clutch valve assemblies and brake valve assemblies, allowing for the transfer of torque from a locked wheel to a rotating wheel on the same axle, maintaining directional control and effective stopping distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If dual-channel or dual-circuit ABS systems are used to minimize control circuits, then cost is reduced, but directional control is compromised when one wheel locks while the other rotates
Solution Approach 1:
The brake system is divided into independent brake circuits for different wheels, with each wheel having its own brake control valve. This segmentation allows individual wheel brake pressure control while using fewer overall control circuits, resolving the contradiction between cost reduction and directional control maintenance.
Solution Approach 2:
The system applies different brake pressures to different wheels based on their individual slip conditions. When one wheel is about to lock, the controller reduces brake pressure only to that specific wheel while maintaining normal pressure on other wheels, preserving directional control while minimizing the number of control circuits needed.
2Loss of time
If one wheel is allowed to lock to minimize stopping distance, then stopping distance is reduced, but directional control is compromised
Solution Approach 1:
The system applies different brake pressures to different wheels based on their individual slip conditions. When one wheel is about to lock, the controller reduces brake pressure only to that specific wheel while maintaining normal pressure on other wheels, preserving directional control while minimizing the number of control circuits needed.
Solution Approach 2:
The brake pressure applied to each wheel is dynamically adjusted in real-time based on wheel speed sensor feedback. The controller continuously monitors wheel slip conditions and modulates brake pressure accordingly, allowing the system to optimize stopping distance while preventing wheel lockup and maintaining directional control.
3Reliability
If braking torque is reduced to prevent wheel lockup, then directional control is maintained, but stopping distance increases
Solution Approach 1:
The system applies different brake pressures to different wheels based on their individual slip conditions. When one wheel is about to lock, the controller reduces brake pressure only to that specific wheel while maintaining normal pressure on other wheels, preserving directional control while minimizing the number of control circuits needed.
Solution Approach 2:
The brake pressure applied to each wheel is dynamically adjusted in real-time based on wheel speed sensor feedback. The controller continuously monitors wheel slip conditions and modulates brake pressure accordingly, allowing the system to optimize stopping distance while preventing wheel lockup and maintaining directional control.
4Productivity
If alternating between locking and unlocking wheels is used, then some braking effectiveness is maintained, but directional control and stopping distance are compromised
Solution Approach 1:
The brake pressure applied to each wheel is dynamically adjusted in real-time based on wheel speed sensor feedback. The controller continuously monitors wheel slip conditions and modulates brake pressure accordingly, allowing the system to optimize stopping distance while preventing wheel lockup and maintaining directional control.
Solution Approach 2:
The system uses wheel speed sensors to provide continuous feedback on wheel rotation speed to the controller. Based on this feedback, the controller determines when a wheel is approaching lockup and adjusts brake pressure accordingly, preventing the alternating lock/unlock cycle and maintaining stable directional control while preserving braking effectiveness.
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 system effectively prevents wheel lockup, maintains directional control, and optimizes stopping distance by transferring torque from one wheel to another, ensuring both wheels remain operational and apply appropriate braking torque.
Implementation Method 1
electrohydraulic antilock brake systems include one or more hydraulic circuits for applying pressure to the brakes of the controlled wheels
Implementation Method 2
transfer of torque from a locked wheel to a rotating wheel on the same axle
Data Source
AI summary
An antilock brake system for a vehicle having a front axle with right and left front brakes and at least one rear axle with right and left rear brakes is disclosed. The front axle includes a front differential with a front clutch and the rear axle includes a rear differential with a rear clutch. A controller is employed to control the brake torque applied through one or more brake valve assemblies and the controller may further shift brake torque from one wheel of an axle to the other wheel on the axle through a differential clutch valve assembly in the clutch of an open differential which forms part of the axle assembly.