Hybrid Drive Motor Reverse Phase Control for Gear-Shifting Vibration

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Hybrid vehicles without a torque converter experience shift vibration and shock due to the absence of mechanical damping, leading to reduced ride comfort and drivability during gear-shifting, as conventional methods like delaying ignition timing are insufficient in effectively reducing jerk.

Innovation Solution

A method and system that divide the gear-shifting range into anti-jerk allowed and prohibited ranges, with reverse phase control of the drive motor using the motor control unit in the allowed ranges to attenuate vibrations and shocks, employing a combination of sensors and control units to manage gear-shifting commands and hydraulic pressure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a torque converter is used to provide mechanical damping, then ride comfort is improved, but device complexity increases and fuel efficiency decreases

Engineering Contradiction:

Improvevibration and shock during gear-shiftingVSAvoidtransmission system complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent extracts the damping function from the torque converter by using the drive motor to independently counteract vibrations during gear-shifting. The control unit detects gear-shifting events and commands the drive motor to generate counter-vibrations, separating the damping function from the mechanical torque converter structure.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical damping system (torque converter) with an electro-magnetic based solution. The drive motor, controlled by the control unit, generates counter-vibrations to offset gear-shifting shocks, substituting mechanical passive damping with active electro-magnetic control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Object-affected harmful factors

If ignition timing is delayed to reduce anti-jerk, then shift shock is reduced, but drivability deteriorates due to unintended shock during launch and gear-shifting

Engineering Contradiction:

Improveshift shockVSAvoiddrivability

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The patent applies preliminary anti-action by detecting gear-shifting events in advance and commanding the drive motor to generate counter-vibrations before and during the gear-shifting process. The control unit identifies the gear-shifting range and applies opposing vibrations to prevent shock occurrence.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent uses periodic action by applying counter-vibrations in specific periodic phases during gear-shifting. The drive motor generates vibrations at controlled frequencies and amplitudes that correspond to the gear-shifting cycle, effectively canceling out the shock without continuous intervention.

Inventive Principle:

Principle #19Periodic action

3Loss of energy

If the damping unit is reduced or excluded to improve fuel efficiency, then mechanical energy loss is reduced, but vibration and shock during operation increase

Engineering Contradiction:

Improvemechanical energy lossVSAvoidvibration from torque source

Core Design Contradiction:

Loss of energyVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical damping unit with an electro-magnetic based vibration counteraction system. The drive motor, controlled by the control unit, generates counter-vibrations to offset gear-shifting shocks, substituting mechanical passive damping with active electro-magnetic control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the operating parameters of the drive motor to achieve vibration counteraction. By adjusting the drive motor's rotation speed and torque output in response to detected gear-shifting events, the system generates appropriate counter-vibrations without requiring additional mechanical damping components.

Inventive Principle:

Principle #35Parameter changes

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

Effectively reduces shift shock and improves anti-jerk performance by utilizing the drive motor's higher responsiveness and controllability, enhancing ride comfort and drivability during gear-shifting.

Implementation Method 1

reverse phase controlling a drive motor in order to attenuate vibrations and shocks generated in the gear-shifting range

Methodology Applied

Scientific EffectVibration: Vibration

Data Source

PatentUS9102324B2Method and system for controlling anti-jerk of hybrid electric vehicle

Publication Date: 2015.08.11 HYUNDAI MOTOR CO LTD

AI summary

A method and system for controlling anti-jerk of a hybrid vehicle reduce shift vibration and shock by reverse phase controlling a drive motor during gear-shifting of a hybrid vehicle without a torque converter. The method includes determining whether a gear-shifting command is outputted from a transmission control unit of the hybrid vehicle; when it is determined that the gear-shifting command is outputted, confirming a gear-shifting range divided into at least three phases in accordance with the gear-shifting command; determining whether the corresponding divided gear-shifting range is an anti-jerk allowed gear-shifting range; and when it is determined that the corresponding gear-shifting range is the anti-jerk allowed gear-shifting range, reverse phase controlling a drive motor of the hybrid vehicle by a predetermined value in order to reduce or attenuate vibration and shock generated in the corresponding gear-shifting range.