Inverter control method for hybrid vehicle

• US 9,796,276 B2
• Filed: 11/17/2015
• Issued: 10/24/2017
• Est. Priority Date: 06/18/2015
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: Kim, Young Un, Rho, Jeongwon, Lim, Jae Sang
• Primary Examiner(s): Ip, Paul
• Application Number:
  US14/943,446
• Publication Number:
  US 20160368388A1
• Time in Patent Office: 707 Days
• Field of Search: 318432, 31840002, 31840009, 31840027, 31840034, 180446
• CPC Class Codes: B60L 15/08 using pulses
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/526 Operating parameters
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: H02P 27/085 wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
• CPC Class Codes: H02P 29/50 Reduction of harmonics
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y10S 903/906 Motor or generator

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.

Claims

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.