ABS Control Amplitude Reduction for Vehicle Shaking

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Solution Overview

Problem

Conventional ABS braking systems cause uncomfortable shaking and vibration during partial and full braking, especially on soft axle suspensions and slippery surfaces, and can result in wheel locking at low speeds.

Innovation Solution

The ABS control method adjusts parameters to reduce wheel control amplitude when the coefficient of friction falls below a threshold, and implements asynchronous control of rear wheels, particularly by altering brake cylinder control phases and holding times to mitigate these issues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the ABS braking system actively controls wheel braking pressure to prevent wheel locking, then wheel lock prevention is improved, but vehicle shaking and vibration increase

Engineering Contradiction:

Improvewheel lock preventionVSAvoidvehicle shaking and vibration

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies periodic action by implementing oscillation suppression through controlled pressure variations. The ABS control unit detects wheel oscillation patterns and applies periodic pressure adjustments to counteract the shaking, transforming the harmful continuous vibration into controlled periodic actions that stabilize the vehicle during ABS operation

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent changes control parameters dynamically by adjusting the wheel control amplitude based on detected oscillation conditions. When oscillation is detected, the control unit modifies braking pressure parameters to reduce the amplitude of pressure variations, thereby suppressing vehicle shaking while maintaining wheel lock prevention functionality

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the wheel control amplitude is increased to improve ABS control effectiveness, then braking performance is improved, but vehicle shaking is intensified

Engineering Contradiction:

Improvebraking performanceVSAvoidvehicle shaking

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies dynamics by making the wheel control amplitude adaptive rather than fixed. The control unit continuously monitors wheel behavior and dynamically adjusts the control amplitude based on oscillation detection, allowing the system to optimize between braking performance and shaking suppression in real-time operating conditions

Inventive Principle:

Principle #15Dynamics

3Reliability

If the ABS control operates with high control amplitude to ensure effective braking control, then wheel lock prevention is enhanced, but braking comfort deteriorates

Engineering Contradiction:

Improvewheel lock preventionVSAvoidbraking comfort

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent implements feedback by continuously monitoring wheel oscillation and vehicle behavior during ABS operation. The control unit uses this feedback to detect oscillation patterns and adjusts the wheel control amplitude accordingly, creating a closed-loop system that balances wheel lock prevention with braking comfort based on real-time conditions

Inventive Principle:

Principle #23Feedback

Data Source

PatentEP2213535B1ABS control method for a vehicle and vehicle with an ABS braking system

Publication Date: 2015.05.20 ZF CV SYST HANNOVER GMBH

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AI summary

The anti-lock braking system (ABS) control method involves changing ABS-control such that the wheel control amplitude, assigned to one of the wheels, is reduced opposite to a wheel control amplitude generated by unchanged ABS-control parameter, if a frictional coefficient attains or fall below a friction threshold between the wheel and a wheel subsurface, or if a failure of another wheel brake of the vehicle exists. An independent claim is also included for a vehicle with ABS-brake system.