Driving system

Patent metadata

Field	Value
Publication number	US-11214153-B2
Application number	US-202117159688-A
Country	US
Kind code	B2
Filing date	Jan 27, 2021
Priority date	Nov 8, 2016
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A driving system includes a first alternating-current rotary electrical machine and a second alternating-current rotary electrical machine. The driving system includes: a first inverter electrically connected to the first alternating-current rotary electrical machine; a second inverter electrically connected to a first end of each of phase windings constituting the second alternating-current rotary electrical machine; a step-up converter; and a third inverter that is electrically connected to a second end of each of the phase windings and transfers power to a second direct-current power source different from the first direct-current power source to drive the second alternating-current rotary electrical machine. The step-up converter raises an output voltage of the first direct-current power source and outputs the output voltage to the first inverter and the second inverter. The second direct-current power source and the first alternating-current rotary electrical machine are connected by a single connection route.

First claim

What is claimed is:

1. A driving system with a first alternating-current rotary electrical machine and a second alternating-current rotary electrical machine, comprising:
a first inverter that is electrically connected to the first alternating-current rotary electrical machine to drive the first alternating-current rotary electrical machine;
a second inverter that is electrically connected to a first end of both ends of each of phase windings constituting the second alternating-current rotary electrical machine to drive the second alternating-current rotary electrical machine;
a step-up converter that has a power source-side connection unit electrically connectable to a first direct-current power source and an inverter-side connection unit electrically connected to the first inverter via a first electrical path and electrically connected to the second inverter via a second electrical path, and raises an output voltage of the first direct-current power source and outputs the output voltage to the first inverter and the second inverter; and
a third inverter that is electrically connected to a second end of the both ends of each of the phase windings constituting the second alternating-current rotary electrical machine, and transfers power to a second direct-current power source different from the first direct-current power source to drive the second alternating-current rotary electrical machine, wherein
the second direct-current power source and the first alternating-current rotary electrical machine are connected by a single connection route,
the driving system is mounted in a vehicle,
each of the first alternating-current rotary electrical machine and the second alternating-current rotary electrical machine is connected to wheels of the vehicle in such a manner capable of transferring motive power, and the driving system comprises:
an auxiliary machine that is electrically connected to at least one of
the first direct-current power source and a third direct-current power source different from the first direct-current power source and the second direct-current power source;
a DCDC converter that lowers the direct-current voltage output from the first direct-current power source and supplies the direct-current voltage to the third direct-current power source; and
a regeneration control unit that performs a process of providing an instruction to control the first inverter to cause the first alternating-current rotary electrical machine to generate regenerative power using kinetic energy of the vehicle during running of the vehicle and a process of providing an instruction to control the second inverter to cause the second alternating-current rotary electrical machine to generate regenerative power using the kinetic energy of the vehicle during running of the vehicle.

2. The driving system according to claim 1 , wherein
the output voltage of the first direct-current power source is set to be lower than the output voltage of the second direct-current power source, and
the auxiliary machine is electrically connected to the third direct-current power source.

3. The driving system according to claim 1 , wherein
the DCDC converter is a bidirectional DCDC converter that is capable of supplying power from the third direct-current power source to the first direct-current power source,
the second alternating-current rotary electrical machine is a motive power source of the vehicle, and
the driving system comprises:
an abnormality determination unit that determines whether an abnormality has occurred in the second direct-current power source;
an abnormality control unit that, when the abnormality determination unit determines that an abnormality has occurred in the second direct-current power source, provides an instruction to control the DCDC converter to charge the first direct-current power source with discharge power of the third direct-current power source or supply the discharge power of the third direct-current power source to the second alternating-current rotary electrical machine; and
an evacuation control unit that, when the abnormality determination unit determines that an abnormality has occurred in the second direct-current power source, provides an instruction to control the second inverter to supply power from at least one of the first direct-current power source and the third direct-current power source to the second alternating-current rotary electrical machine to drive the second alternating-current rotary electrical machine.

4. The driving system according to claim 1 , wherein
the vehicle includes an engine as a motive power source of the vehicle,
the DCDC converter is a bidirectional DCDC converter that is capable of supplying power from the third direct-current power source to the first direct-current power source,
the first alternating-current rotary electrical machine has a starter function to provide initial rotation of an output shaft of the engine, the second alternating-current rotary electrical machine is a motive power source of the vehicle, and
the driving system comprises:
an abnormality determination unit that determines whether an abnormality has occurred in the second direct-current power source;
an abnormality control unit that, when the abnormality determination unit determines that an abnormality has occurred in the second direct-current power source, provides an instruction to control the DCDC converter to charge the first direct-current power source with discharge power of the third direct-current power source; and
an evacuation control unit that, when the abnormality determination unit determines that an abnormality has occurred in the second direct-current power source, provides an instruction to control the first inverter to supply power from the first direct-current power source to the first alternating-current rotary electrical machine to drive the first alternating-current rotary electrical machine for power running to provide initial rotation of the output shaft of the engine and performs a control to start combustion of the engine.

5. The driving system according to claim 1 , wherein
the first direct-current power source is a capacitor, and
the driving system comprises a discharge control unit that, when determining that a stop instruction signal for the driving system has been input, provides an instruction to control the DCDC converter to charge the third direct-current power source with the discharge power of the first direct-current power source.

6. The driving system according to claim 1 , wherein
the auxiliary machine is electrically connected to the first direct-current power source,
the driving system comprises an output acquisition unit that acquires required output power of the auxiliary machine, and
the regeneration control unit provides an instruction to control at least one of the second inverter and the third inverter for the required output power acquired by the output acquisition unit to be met to the generated regenerative power to be supplied from at least one of the first alternating-current rotary electrical machine and the second alternating-current rotary electrical machine to the first direct-current power source via the step-up converter.

7. The driving system according to claim 5 , wherein
the auxiliary machine includes:
an auxiliary rotary electrical machine as a rotary electrical machine; and
an auxiliary machine inverter that is operated to convert direct-current power output from the first direct-current power source to alternating-current power and apply the alternating-current power to the auxiliary rotary electrical machine, and
the driving system comprises:
an auxiliary machine information acquisition unit that acquires rotation speed and torque of the auxiliary rotary

Assignees

• Denso Corp

Inventors

• Kobayashi Hisaaki

Classifications

• B60W10/06

  including control of combustion engines · CPC title

• Y02T10/72

  Electric energy management in electromobility · CPC title

• Y02T10/92

  Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles · CPC title

• B60L50/50 Primary

  using propulsion power supplied by batteries or fuel cells · CPC title

• H02M7/48

  using discharge tubes with control electrode or semiconductor devices with control electrode · CPC title