Drive system

Patent metadata

Field	Value
Publication number	US-2019288628-A1
Application number	US-201916432063-A
Country	US
Kind code	A1
Filing date	Jun 5, 2019
Priority date	Dec 5, 2016
Publication date	Sep 19, 2019
Grant date	—

Abstract

A drive system includes a first inverter electrically connected to a first AC rotating electrical machine, a second inverter electrically connected to first end sides of phase coils constituting a second AC rotating electrical machine, a boost converter, and a third inverter electrically connected to a second end sides of phase coils and drives the second AC rotating electrical machine by transmitting electrical power between the third inverter and a second DC power source different from a first DC power source. The drive system is configured such that the second DC power source and the first AC rotating electrical machine are connected via a single connecting route. The drive system includes a processor that changes a control state of at least one of the first to third inverters and the boost converter based on a state of at least one of the first to third inverters, the boost converter, and the first and second DC power sources.

First claim

What is claimed is:

1 . A drive system including a first AC rotating electrical machine and a second AC electrical machine, the drive system comprising:
a first inverter electrically connected to the first AC rotating electrical machine and driving the first AC rotating electrical machine; a second inverter electrically connected to a first end of the two ends of each phase coil constituting the second AC rotating electrical machine and driving the second AC rotating electrical machine; a boost converter including a power-source-side connector electrically connectable to a first DC power source and electrically connected to an inverter-side connector electrically connected to the first inverter via a first electrical path and the second inverter via a second electrical path, the boost converter stepping up an output voltage of the first DC power source and outputting the stepped up output voltage to the first inverter and the second inverter; and a third inverter electrically connected to a second end side of the two ends of each phase coil constituting the second AC rotating electrical machine and driving the second AC rotating electrical machine by transmitting electrical power between the third inverter and a second DC power source different from the first DC power source, wherein the second DC power source and the first AC rotating electrical machine are configured to be connected via a single connecting path, the drive system further includes a processor that performs a process of changing a control state of at least one of the first inverter, the second inverter, the third inverter, and the boost converter based on the state of at least one of the first inverter, the second inverter, the third inverter, the boost converter, the first DC power source, and the second DC power source, wherein a threshold for determining an overdischarged state of the first DC power source is set to be a first overdischarge threshold, a threshold for determining an overcharged state of the second DC power source is set to be a second overcharge threshold, the processor acquires a first charging rate that is a charging rate of the first DC power source as a state of the first DC power source and a second charging rate that is a charging rate of the second DC power source as a state of the second DC power source, and when the processor determines that the first charging rate is smaller than or equal to the first overdischarge threshold and the second charging rate is larger than or equal to the second overcharge threshold, the processor performs, as a process of changing the control state, a process of increasing electrical power fed from the second DC power source to the second AC rotating electrical machine via the third inverter and increasing generated power fed from the second AC rotating electrical machine to the first DC power source via the second inverter such that the first DC power source is charged by electrical power discharged from the second DC power source.

2 . The drive system according to claim 1 , wherein
when the processor determines that the first charging rate is smaller than or equal to the first overdischarge threshold and the second charging rate is smaller than the second overcharge threshold, the processor performs, as a process of changing the control state, a process of increasing generated electrical power fed from the first AC rotating electrical machine to the first inverter such that the first DC power source is charged with power generated at the first AC rotating electrical machine.

3 . A drive system including a first AC rotating electrical machine and a second AC electrical machine, the drive system comprising:
a first inverter electrically connected to the first AC rotating electrical machine and driving the first AC rotating electrical machine; a second inverter electrically connected to a first end of the two ends of each phase coil constituting the second AC rotating electrical machine and driving the second AC rotating electrical machine; a boost converter including a power-source-side connector electrically connectable to a first DC power source and electrically connected to an inverter-side connector electrically connected to the first inverter via a first electrical path and the second inverter via a second electrical path, the boost converter stepping up an output voltage of the first DC power source and outputting the stepped up output voltage to the first inverter and the second inverter; and a third inverter electrically connected to a second end side of the two ends of each phase coil constituting the second AC rotating electrical machine and driving the second AC rotating electrical machine by transmitting electrical power between the third inverter and a second DC power source different from the first DC power source, wherein the second DC power source and the first AC rotating electrical machine is configured to be connected via a single connecting path, the drive system further includes a processor that performs a process of changing a control state of at least one of the first inverter, the second inverter, the third inverter, and the boost converter based on the state of at least one of the first inverter, the second inverter, the third inverter, the boost converter, the first DC power source, and the second DC power source, wherein a threshold for determining an overdischarged state of the first DC power source is set to be a first overdischarge threshold, a threshold for determining an overcharged state of the second DC power source is set to be a second overcharge threshold, the processor acquires a first charging rate that is a charging rate of the first DC power source as a state of the first DC power source and a second charging rate that is a charging rate of the second DC power source as a state of the second DC power source, and when the processor determines that the first charging rate is smaller than or equal to the first overdischarge threshold and the second charging rate is smaller than the second overcharge threshold, the processor performs, as a process of changing the control state, a process of increasing generated electrical power fed from the first AC rotating electrical machine to the first inverter such that the first DC power source is charged with power generated at the first AC rotating electrical machine.

4 . The drive system according to claim 1 , wherein
a threshold for determining an overcharged state of the first DC power source is set to be a first overcharge threshold, a threshold for determining an overdischarged state of the second DC power source is set to be a second overdischarge threshold, when the processor determines that the first charging rate is larger than or equal to the first overcharge threshold and the second charging rate is smaller than or equal to the second overdischarge threshold, the processor performs, as a process of changing the control state, a process of increasing electrical power fed from the second inverter to the second AC rotating electrical machine and increasing generated power fed from the second AC rotating electrical machine to the third inverter such that the second DC power source is charged with electrical power discharged from the first DC power source.

5 . A drive system including a first AC rotating electrical machine and a second AC electrical machine, the drive system comprising:
a first inverter electrically connected to the first AC rotating electrical machine and driving the first AC rotating electrical machine; a second inverter electrically connected to a first end of the two ends of each phase coil constituting the second AC rotating electrical machine and driving the second AC rotating electrical machine; a boost converter including a power-source-side connector elect

Assignees

• Denso Corp

Inventors

• Kobayashi Hisaaki

Classifications

• B60L50/75

  using propulsion power supplied by both fuel cells and batteries · CPC title

• B60L53/20

  characterised by converters located in the vehicle · CPC title

• B60L9/18 Primary

  fed from DC supply lines · CPC title

• B60L50/51

  characterised by AC-motors · CPC title

• H02M7/53871

  with automatic control of output voltage or current · CPC title