# US 10,479,367 B2 · Apparatus and method for active vibration control of hybrid electric vehicle

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- Number: US 10,479,367 B2
- Document ID: US10479367B2
- Status: Granted
- Kind: B2
- Application number: 15/987,013
- Filed: 2018-05-23
- Published: 2018-09-20
- Granted: 2019-11-19
- Earliest claimed: 2015-12-11
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Hyundai Motor Company; Kia Motors Corporation
- Inventors: Sung Jae Kim; Jeong Soo Eo
- Web page: https://patentgrep.com/patent/US10479367B2

## CPC

- B60W 30/20: Reducing vibrations in the driveline
- B60K 6/485: Motor-assist type
- B60W 10/06: including control of combustion engines
- B60W 10/08: including control of electric propulsion units, e.g. motors or generators
- B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)}
- B60W 50/0098: {Details of control systems ensuring comfort, safety or stability not otherwise provided for}
- B60W 2030/206: {related or induced by the engine}
- B60W 2050/0057: {Frequency analysis, spectral techniques or transforms}
- B60W 2510/0657: Engine torque
- B60W 2510/081: Speed
- B60W 2510/082: Speed change rate
- B60Y 2300/20: Reducing vibrations in the driveline
- B60Y 2300/205: related or induced by the engine
- Y02T 10/62: Hybrid vehicles
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An apparatus for active vibration control of a hybrid electric vehicle including an engine and a motor is disclosed. The apparatus includes: a position sensor to detect position information of the engine or the motor; and a controller to select a reference angle signal based on a signal from the position sensor. The controller performs fast Fourier transform (FFT) analysis by generating a reference angle, extracts a vibration component of each frequency through the FFT analysis, generates a reference signal by performing inverse FFT, and performs active vibration control of each frequency by reflecting a basic amplitude ratio, an adjustable rate according to an engine load, and an engine torque to the reference signal.

## Claims

### Claim 1

An apparatus for active vibration control of a hybrid electric vehicle including an engine and a motor, the apparatus comprising:
a position sensor configured to detect position information of the engine or the motor; and
a controller configured to:
determine a reference angle signal based on the position information detected by the position sensor,
generating a reference angle corresponding to the reference angle signal,
set a period for applying a fast Fourier transform (FFT) based on an engine attribute of the engine,
after the period for applying the FFT is set, analyze a FFT signal based on performing the FFT on an engine speed or a motor speed during the period, the FFT signal comprised of a plurality of frequency components,
determine a reference spectrum covering the plurality of frequency components based on the engine speed and an engine load of the engine,
extract vibration components from the FFT signal based on the comparison of the FFT signal with the reference spectrum,
select a removal object frequency from the extracted vibration components,
determine a reference signal by performing an inverse FFT on the selected removal object frequency,
determine a basic amplitude ratio based on the engine speed and the engine load, and determine an adjustable rate based on the engine load, and
perform active vibration control on each of the plurality of frequency components by summing values calculated from the basic amplitude ratio, the adjustable rate, an engine torque, and the reference signal.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the controller is configured to set up the reference angle between a top dead center (TDC) of a number one cylinder and a bottom dead center (BDC) of a number four cylinder based on information of the position of the engine.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein the controller is configured to set up the period in consideration of a cylinder and stroke of the engine, and analyze the FFT signal by a calculated magnitude and phase of each of the plurality of frequency components.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein the controller is configured to determine the adjustable rate according to the engine load to decrease an anti-phase torque when the engine load is greater than or equal to a predetermined load.