# US 11,909,344 B2 · Control device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,909,344 B2
- Document ID: US11909344B2
- Status: Granted
- Kind: B2
- Application number: 17/306,027
- Filed: 2021-05-03
- Published: 2021-12-02
- Granted: 2024-02-20
- Earliest claimed: 2020-06-02
- Assignees: Subaru Corporation
- Applicants: Subaru Corporation
- Inventors: Kazuma Shimojo
- Web page: https://patentgrep.com/patent/US11909344B2

## CPC

- H02P 29/50: Reduction of harmonics
- B60L 15/08: using pulses
- B60L 53/20: characterised by converters located in the vehicle
- H02P 27/085: {wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency}
- Y02T 10/64: Electric machine technologies in electromobility
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y02T 90/14: Plug-in electric vehicles
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A control device includes a processor configured to control operation of an inverter by a synchronous pulse width modulation control using a pulse width modulation signal. The inverter is coupled to a motor. The pulse width modulation signal is generated by comparison of a carrier signal and a voltage command. In the synchronous pulse width modulation control, on the condition that resonance is caused, in a circuit including the inverter, by a particular harmonic component out of harmonic components to be generated in accordance with the pulse width modulation signal, the processor is configured to change the number of pulses of the carrier signal in one cycle of the voltage command, from the main number of pulses to the sub-number of pulses.

## Claims

### Claim 1

A control device comprising
a processor configured to control operation of an inverter by a synchronous pulse width modulation control using a pulse width modulation signal, the inverter being coupled to a motor, and the pulse width modulation signal being generated by comparison of a carrier signal and a voltage command, wherein:
the processor is configured to:
when a motor speed of the motor is outside of a predetermined speed range, set a number of pulses of the carrier signal in one cycle of the voltage command to a main number of pulses; and
when the motor speed is in the predetermined speed range, set the number of pulses of the carrier signal in one cycle of the voltage command to a sub number of pulses which is an odd number and smaller than the main number of pulses,
the predetermined speed range is a speed range of the motor in which i) a harmonic component having a predetermined frequency band is generated when the motor is driven by the inverter under the synchronous pulse width modulation control with the number of pulses of the carrier signal in one cycle of the voltage command is the main number of pulses and ii) the harmonic component having the predetermined frequency band is not generated when the motor is driven by the inverter under the synchronous pulse width modulation control with the number of pulses of the carrier signal in one cycle of the voltage command is the sub number of pulses, and
the predetermined frequency band is a frequency band in which resonance of a circuit including the inverter occurs due to the harmonic component having the predetermined frequency band.

### Claim 2 (depends on 1)

The control device according to claim 1, wherein
in setting the sub-number of pulses, whichever number of pulses is closer to the main number of pulses is given priority over whichever number of pulses is more distant from the main number of pulses.

### Claim 3

A control device comprising
circuitry configured to control operation of an inverter by a synchronous pulse width modulation control using a pulse width modulation signal, the inverter being coupled to a motor, and the pulse width modulation signal being generated by comparison of a carrier signal and a voltage command, wherein;
the circuitry is configured to:
when a motor speed of the motor is outside of a predetermined speed range, set a number of pulses of the carrier signal in one cycle of the voltage command to a main number of pulses; and
when the motor speed is in the predetermined speed range, set the number of pulses of the carrier signal in one cycle of the voltage command to a sub number of pulses which is an odd number and smaller than the main number of pulses,
the predetermined speed range is a speed range of the motor in which i) a harmonic component having a predetermined frequency band is generated when the motor is driven by the inverter under the synchronous pulse width modulation control with the number of pulses of the carrier signal in one cycle of the voltage command is the main number of pulses and ii) the harmonic component having the predetermined frequency band is not generated when the motor is driven by the inverter under the synchronous pulse width modulation control with the number of pulses of the carrier signal in one cycle of the voltage command is the sub number of pulses, and
the predetermined frequency band is a frequency band in which resonance of a circuit including the inverter occurs due to the harmonic component having the predetermined frequency band.