Proportioning-Valve Brake Control for ABS Vibration Reduction

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Solution Overview

Problem

Conventional Anti-lock Braking Systems (ABS) face issues such as solenoid-valve brake damage due to oil pressure impacts and sudden wheel speed changes, causing discomfort for drivers and passengers through intermittent vibrations.

Innovation Solution

The implementation of a control module connected to accelerometers, wheel speed sensors, and proportioning-valve brakes, which generates braking control voltages based on vehicle acceleration and wheel speed signals to adjust braking pressures, using a feedback and feedforward control approach to stabilize wheel speeds and reduce vibrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If solenoid-valve brakes intermittently operate in relieving state and locking state to control wheel speed, then wheel speed can be adjusted to prevent wheel lockup, but the oil-pressure valve sustains impact of oil pressure causing solenoid-valve brake damage

Engineering Contradiction:

Improvewheel lockup preventionVSAvoidsolenoid-valve brake durability

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent introduces a proportioning valve as an intermediary component between the solenoid valve and the brake caliper. The proportioning valve continuously modulates braking pressure based on wheel speed feedback, acting as a buffer that absorbs oil pressure fluctuations and prevents direct impact on the solenoid valve, thereby resolving the contradiction between effective wheel speed control and solenoid valve durability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the conventional solenoid valve's direct mechanical on/off control with an electronic control system that uses sensors and a control unit to generate proportional control signals. This substitution transforms the mechanical intermittent operation into smooth electronic modulation, eliminating the harmful mechanical impacts while maintaining wheel speed control functionality

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If solenoid-valve brakes intermittently operate in relieving state and locking state to control wheel speed, then wheel speed can be adjusted to prevent wheel lockup, but wheel speeds become fast and slow suddenly causing intermittent vibrations

Engineering Contradiction:

Improvewheel lockup preventionVSAvoiddriver comfort

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent implements continuous periodic feedback control where the control unit continuously monitors wheel speed through sensors and adjusts the proportioning valve in real-time. This continuous periodic adjustment smooths out sudden speed changes by making frequent small corrections rather than large intermittent changes, thereby preventing vibrations while maintaining anti-lock braking functionality

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent transitions from static on/off solenoid valve operation to dynamic proportional pressure control. The proportioning valve dynamically adjusts braking pressure continuously based on real-time wheel speed feedback, creating smooth gradual changes in wheel speed rather than sudden transitions, which eliminates the vibration problem while maintaining effective wheel lockup prevention

Inventive Principle:

Principle #15Dynamics

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

This solution enhances the durability of braking components and reduces driver discomfort by smoothly adjusting braking pressures, minimizing vibrations and improving braking efficiency.

Implementation Method 1

an accelerometer outputting a vehicle acceleration signal reflecting acceleration of the vehicle

Methodology Applied

Scientific EffectAccelerometer detection: Accelerometer

Implementation Method 2

each one of the proportioning-valve brakes receiving a braking control voltage to adjust a braking pressure of each one of the wheels according to a magnitude of the braking control voltage

Methodology Applied

Scientific EffectElectromagnetic actuation: Electromagnet

Implementation Method 3

multiple wheel speed sensors respectively corresponding to the multiple wheels and each one of the wheel speed sensors outputting a wheel speed signal

Methodology Applied

Scientific EffectWheel speed sensing:

Data Source

PatentUS11613237B2Anti-lock braking system and control method thereof

Publication Date: 2023.03.28 AUTOMOTIVE RES & TESTING CENT

AI summary

An Anti-lock Braking System and control method are disclosed. The control method is performed after a control module intervenes a vehicle's braking system and comprises: receiving a wheel speed signal of a wheel and a vehicle acceleration signal; computing a tire-slip feedback value according to the wheel speed signal of the wheels and the vehicle acceleration signal; generating a feedback control voltage according to a tire-slip difference between a tire-slip target value and the tire-slip feedback value; generating a tire-slip compensation value by performing a differential compensation to the tire-slip feedback value; obtaining a feedforward voltage according to the tire-slip compensation value via a look-up table approach; generating a braking control voltage by adding the feedback control voltage to the feedforward voltage; and outputting the braking control voltage to a proportioning-valve brake, such that the proportioning-valve brake adjusts a braking pressure according to the braking control voltage.