Inverter control method for hybrid vehicle

Patent metadata

Field	Value
Publication number	US-9796276-B2
Application number	US-201514943446-A
Country	US
Kind code	B2
Filing date	Nov 17, 2015
Priority date	Jun 18, 2015
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

An inverter control method for a hybrid vehicle includes: monitoring a torque command and a motor speed of the vehicle in real-time; determining whether the motor speed is less than a first speed; determining whether an absolute value of the torque command is less than a first torque when the motor speed is less than the first speed; changing a switching frequency to a predetermined frequency when the absolute value of the torque command is less than the first torque; and controlling an inverter operation by generating a pulse-width modulation (PWM) signal with the switching frequency changed to the predetermined frequency.

First claim

What is claimed is:

1. An inverter control method for a hybrid vehicle, the method comprising:
monitoring a torque command and a motor speed of the vehicle in real-time;
determining whether the motor speed is less than a first speed;
determining whether an absolute value of the torque command is less than a first torque when the motor speed is less than the first speed;
changing a switching frequency periodically and alternately between two different frequencies when the absolute value of the torque command is less than the first torque; and
controlling an inverter operation by generating a pulse-width modulation (PWM) signal with the changed switching frequency;
wherein the changing of the switching frequency to the predetermined frequency comprises:
changing a mode between a double sampling mode using a frequency which is twice the switching frequency as a sampling frequency, and a single sampling mode using an identical frequency to the switching frequency as the sampling frequency.

2. The inverter control method of claim 1 , further comprising:
controlling the inverter operation by generating a PWM signal with a fixed switching frequency when the motor speed is greater than or equal to the first speed.

3. The inverter control method of claim 2 , further comprising:
controlling the inverter operation by generating the PWM signal with the fixed switching frequency when the absolute value of the torque command is greater than or equal to the first torque.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Kim Young Un
• Rho Jeongwon
• Lim Jae Sang

Classifications

• H02P27/085

  wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency · CPC title

• B60L11/1803 Primary

  Operations & Transport · mapped topic

• Y10S903/906

  Motor or generator · CPC title

• H02P29/50

  Reduction of harmonics · CPC title

• Y02T10/7005

  Cross-Sectional Technologies · mapped topic