Vehicular air conditioning device

Patent metadata

Field	Value
Publication number	US-10150347-B2
Application number	US-201515110063-A
Country	US
Kind code	B2
Filing date	Jan 14, 2015
Priority date	Jan 21, 2014
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

In a vehicular air conditioning device, a heater core is disposed on a circulation passage for cooling water for cooling a motor, and an inverter configured to control an output of the motor by changing a carrier frequency, and heats conditioning air. An air conditioning controller sets a required calorific value of the motor and the inverter according to a vehicle compartment temperature requested by a passenger. A carrier frequency changing unit sets a carrier frequency at which a calorific value of the motor and the inverter is made equal to the required calorific value, out of carrier frequencies capable of implementing a target output of the motor to be set depending on a traveling state of a vehicle. An electric power conversion device converts direct-current power of a battery into alternating-current power at the set carrier frequency, and supplies the alternating-current power to the motor.

First claim

The invention claimed is:

1. A vehicular air conditioning device comprising:
a motor which is provided on a vehicle as a drive source;
an inverter for controlling an output of the motor by changing, a carrier frequency;
a heater core disposed on a circulation passage for coolant for cooling at least one of the motor and the inverter, and configured to heat conditioning air by using the coolant as a heat source;
a required calorific value setting device which sets a required calorific value of the motor and the inverter according to a vehicle compartment temperature requested by a passenger;
a carrier frequency setting device which sets a first carrier frequency at which a calorific value of the motor and the inverter is made equal to the required calorific value set by the required calorific value setting device with implementing a target output of the motor which depends on a traveling state of the vehicle, the first carrier frequency being prioritized over a second carrier frequency whose motor efficiency is higher among a plurality of carrier frequencies capable of implementing the target output of the motor, the plurality of carrier frequencies comprising the first carrier frequency and the second carrier frequency; and
an electric power conversion device which converts direct-current power of a power storage device into alternating-current power at the first carrier frequency set by the carrier frequency setting device, and supplies the alternating-current power to the motor.

2. The vehicular air conditioning device according to claim 1 , wherein
the carrier frequency setting device sets a third carrier frequency at which the calorific value of the motor and the inverter is maximized, out of the carrier frequencies capable of implementing the target output of the motor, until a predetermined time lapses after the motor starts operating, no matter how large or small the required calorific value set by the required calorific value setting device is.

3. The vehicular air conditioning device according to claim 1 , further comprising:
a securable calorific value setting device which sets a securable calorific value when it is impossible to secure the required calorific value set by the required calorific value setting device by 100%; and
a conditioned air flow rate reducing device which reduces a flow rate of conditioned air to keep a temperature of conditioned air at a vehicle compartment temperature requested by a passenger with the securable calorific value set by the securable calorific value setting device.

4. The vehicular air conditioning device according to claim 1 , further comprising:
a determination device which determines whether the power storage device is in a full charge state; and
an execution device which performs electric power conversion at a third carrier frequency at which efficiency of the motor is low when the determination device determines that the power storage device is in a full charge state, as compared with a case in which the determination device determines that the power storage device is not in a full charge state.

5. The vehicular air conditioning device according to claim 1 , wherein
the carrier frequency setting device sets a highest carrier frequency among the plurality of carrier frequencies capable of implementing the target output of the motor, until a predetermined time lapses after the motor starts operating, no matter how large or small the required calorific value.

6. The vehicular air conditioning device according to claim 5 , wherein
after the predetermined time elapses, the carrier frequency setting device sets a third carrier frequency, which is lower than that of the highest carrier frequency until the predetermined time lapses after the motor starts operating.

7. The vehicular air conditioning device according to claim 1 , wherein
the target output is calculated by multiplying a target torque with a target rotation number.

8. An air conditioning device for use in a vehicle, the air conditioning device comprising:
a motor which is provided on the vehicle as a drive source;
an inverter for controlling an output of the motor by changing a carrier frequency;
an air conditioning device, which has a circulation passage for coolant for cooling at least one of the motor and the inverter, and the air conditioning device uses the coolant as a heat source;
a required calorific value setting device which sets a required calorific value of the motor and the inverter according to a vehicle compartment temperature requested by a passenger; and
a carrier frequency setting device which sets a first carrier frequency at which a calorific value of the motor and the inverter is made equal to the required calorific value set by the required calorific value setting device with implementing a target output of the motor which depends on a traveling state of the vehicle, the first carrier frequency being prioritized over a second carrier frequency whose motor efficiency is higher among a plurality of carrier frequencies capable of implementing the target output of the motor, the plurality of carrier frequencies comprising the first carrier frequency and the second carrier frequency.

9. The air conditioning device according to claim 8 , wherein
the carrier frequency setting device sets a highest carrier frequency among the plurality of carrier frequencies capable of implementing the target output of the motor, until a predetermined time lapses after the motor starts operating, no matter how large or small the required calorific value.

10. The air conditioning device according to claim 9 , wherein
after the predetermined time elapses, the carrier frequency setting device sets a third carrier frequency, which is lower than that of the highest carrier frequency until the predetermined time lapses after the motor starts operating.

11. The air conditioning device according to claim 8 , wherein
the target output is calculated by multiplying a target torque with a target rotation number.

Assignees

• Mazda Motor

Inventors

• Hirano Takuo
• Miura Takahiko

Classifications

• B60L1/003

  to auxiliary motors, e.g. for pumps, compressors · CPC title

• B60L2240/36

  Temperature of vehicle components or parts · CPC title

• B60H2001/00307

  Component temperature regulation using a liquid flow · CPC title

• Y02T10/7275

  Cross-Sectional Technologies · mapped topic

• B60L2240/34

  Cabin temperature · CPC title