Active Vibration Reduction Device for Rigid Engine Support

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Solution Overview

Problem

Existing active vibration reduction devices face a decrease in vibration reduction effectiveness when the engine side shaft member abuts a stopper, transitioning from elastic to rigid support, allowing dynamic torque to directly transmit to the vehicle body, leading to increased vibrations and noise.

Innovation Solution

An active vibration reduction device that includes a torque rod with insulators and an inertial mass, utilizing a basic signal generating unit, control signal generating unit, offset vibration generating unit, error signal detecting unit, and a correction table storing unit to adaptively control the vibration reduction, even in rigid supporting conditions, by estimating static torque and using correction tables to correct simulated vibration transmission characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the engine side shaft member is elastically supported by the hollow cylindrical member through elastic members, then the vibration reduction effect is improved, but when the shaft member abuts the stopper, the support becomes rigid and dynamic torque directly transmits to the vehicle body

Engineering Contradiction:

Improvevibration reduction effectivenessVSAvoidsupport flexibility under varying torque conditions

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The support system dynamically transitions between elastic and rigid states based on operating conditions. The shaft member can abut the stopper under high static torque to provide rigid support, while maintaining elastic support capability under normal conditions for vibration reduction.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the support characteristic parameter from elastic to rigid by introducing the stopper mechanism. This parameter change allows the shaft member to switch between two support modes depending on the static torque magnitude.

Inventive Principle:

Principle #35Parameter changes

2Strength

If the shaft member abuts the stopper providing rigid support, then the durability and positional stability are improved, but the vibration reduction effect deteriorates due to direct dynamic torque transmission

Engineering Contradiction:

Improvedurability and positional stabilityVSAvoidvibrations and noise transmitted to vehicle body

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The support function is segmented into two independent components: the elastic members for vibration reduction and the stopper for durability and positional stability. This segmentation allows each component to optimize its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The stopper acts as an intermediary element that provides rigid support when needed, while the elastic members continue to function as intermediaries for vibration isolation. The control system mediates between these two support mechanisms.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If the inertial mass is driven by the actuator to generate antiphase vibrations, then the vibration cancellation effect is improved, but the control accuracy deteriorates when the support condition changes from elastic to rigid

Engineering Contradiction:

Improvevibration cancellation effectivenessVSAvoidcontrol accuracy under varying support conditions

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The control system uses feedback from vibration sensors to continuously adjust the actuator control signals. This feedback mechanism allows the system to adapt to changing support conditions and maintain control accuracy whether the shaft member is in elastic or rigid support state.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The control system dynamically adjusts its parameters based on the current support condition. When the shaft member transitions from elastic to rigid support, the control algorithm adapts to maintain optimal vibration cancellation performance.

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

The device effectively reduces vibrations transmitted from the engine to the vehicle body even in rigid supporting conditions, enhancing durability and maintaining a comfortable driving environment by suppressing erroneous reference signals and direct dynamic torque application.

Implementation Method 1

an elastic support through an elastic member between the shaft member and the hollow cylindrical member

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

an inertial mass to increase the vibration reduction effect with the torque rod by providing an actuator for generating at an inertial mass vibrations which is antiphase with the vibrations of the engine

Methodology Applied

Scientific EffectInertia: Inertia

Data Source

PatentUS9308806B2Active vibration reduction device

Publication Date: 2016.04.12 HONDA MOTOR CO LTD

AI summary

The reference signal generating unit corrects the simulated vibration transmission characteristic from the offset vibration generating unit to the acceleration sensor using one of the correction tables switched corresponding to the static torque of the engine estimated by the static torque estimating unit out of the stored content of the correction table storing unit to generate control signals. The vibration transmitted from the engine to the side of the vehicle body can be surely reduced by offset vibration generated by the control signals at the offset vibration generating unit even in an essentially rigidly supporting status.