Hybrid drive system

Patent metadata

Field	Value
Publication number	US-9493077-B2
Application number	US-201314786816-A
Country	US
Kind code	B2
Filing date	Jul 1, 2013
Priority date	Jul 1, 2013
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

A hybrid drive system includes first and second power supply devices supplying direct-current power, first and second power storage devices respectively connected to the first and second power supply devices and accumulating or discharging direct-current power, a first load device receiving direct-current power from the first power supply device and the first power storage device and driving a first load, a second load device receiving direct-current power from the second power supply device and the second power storage device and driving a second load, a first diode including an anode side terminal connected to an output side of the first power storage device, a second diode including an anode side terminal connected to an output side of the second power storage device, and an auxiliary power supply device to which a connection terminal of cathode side terminals of the first and second diodes is connected as an input terminal.

First claim

The invention claimed is:

1. A hybrid drive system including first and second power supply devices that supply direct-current power, first and second power storage devices that are respectively connected to the first and second power supply devices and accumulate or discharge direct-current power, a first load device that receives direct-current power supplied from the first power supply device and the first power storage device and drives a first load, and a second load device that receives direct-current power supplied from the second power supply device and the second power storage device and drives a second load, the hybrid drive system comprising:
a first diode that includes an anode side terminal connected to an output side of the first power storage device;
a second diode that includes an anode side terminal connected to an output side of the second power storage device; and
an auxiliary power supply device to which a connection terminal where cathode side terminals of the first and second diodes are connected is connected as an input terminal.

2. The hybrid drive system according to claim 1 , wherein the auxiliary power supply device is a device that outputs electric power other than electric power for propulsion driving of a vehicle.

3. The hybrid drive system according to claim 1 , further comprising a current measuring device to detect an input current input to the auxiliary power supply device, wherein
the hybrid drive system calculates first and second power supply supplement amounts, which are a same amount, on a basis of a current value obtained by the current measuring device, and
the first and second power supply supplement amounts are given as command values for the first and second power storage devices, respectively.

4. The hybrid drive system according to claim 1 , further comprising:
a current measuring device to detect an input current input to the auxiliary power supply device; and
a voltage detector to detect an input voltage input to the auxiliary power supply device, wherein
the hybrid drive system calculates first and second power supply supplement amounts, which are a same amount, on a basis of a product of a current value obtained by the current measuring device and a voltage value obtained by the voltage detector, and
the first and second power supply supplement amounts are given as command values for the first and second power storage devices, respectively.

5. The hybrid drive system according to claim 1 , wherein
the first power supply device and the first load device are individually controlled by a first control unit,
the second power supply device and the second load device are individually controlled by a second control unit,
each of the first and second control units includes:
an output-current-command-value generating unit to generate an output current command value using a power supply supplement amount that is calculated on a basis of a current value obtained by a current measuring device that detects an input current input to the auxiliary power supply device; and
an output current controller to generate an output voltage command value for causing the current value obtained by the current measuring device to follow the output current command value and output the output voltage command value to a corresponding one of the power supply devices, and
a power supply supplement amount calculated by the first control unit and a power supply supplement amount calculated by the second control unit are a same amount.

6. The hybrid drive system according to claim 1 , wherein
the first power supply device and the first load device are individually controlled by a first control unit,
the second power supply device and the second load device are individually controlled by a second control unit,
each of the first and second control units includes:
an output-current-command-value generating unit to generate an output current command value using a power supply supplement amount that is calculated on a basis of a product of a current value obtained by a current measuring device that detects an input current input to the auxiliary power supply device and a voltage value obtained by a voltage detector that detects an input voltage input to the auxiliary power supply device; and
an output current controller to generate an output voltage command value for causing the current value obtained by the current measuring device to follow the output current command value and output the output voltage command value to a corresponding one of the power supply devices, and
a power supply supplement amount calculated by the first control unit and a power supply supplement amount calculated by the second control unit are a same amount.

7. The hybrid drive system according to claim 5 , wherein the current measuring device includes a first current measuring device to input a measurement value to the first control unit and a second current measuring device to input a measurement value to the second control unit.

8. The hybrid drive system according to claim 5 , wherein
the current measuring device includes a first current measuring device to input a measurement value to both the first and second control units and a second current measuring device to input a measurement value to both the first and second control units, and
the output-current-command-value generating units of the first and second control units generate an output command value using an average of the measurement values.

9. The hybrid drive system according to claim 5 , wherein, when both the first and second power supply devices are continuing a normal operation, the hybrid drive system calculates a component equivalent to a half of a measurement value of the current measuring device as the power supply supplement amount.

10. The hybrid drive system according to claim 5 , wherein, when any one of the first and second power supply devices stops operating, an output voltage command value that is calculated on a basis of a power supply supplement amount that is twice as large as a power supply supplement amount when both the first and second power supply devices are normally functioning is given to another of the first and second power supply devices that is continuing a normal operation.

11. The hybrid drive system according to claim 1 , further comprising first and second temperature detection sensors to measure internal temperatures of the first and second power storage devices, respectively, wherein
when a temperature difference between the internal temperature of the first power storage device and the internal temperature of the second power storage device exceeds a threshold, the hybrid drive system controls a power supply device connected to a power storage device on a higher temperature side such that a voltage or a charging amount of a power storage device on a lower temperature side is larger than a voltage or a charging amount of the power storage device on a higher temperature side.

12. The hybrid drive system according to claim 1 , wherein the first and second power supply devices are DC-DC converters to convert a voltage value of direct-current power supplied from a direct-current overhead wire into a direct-current voltage suitable for the power storage devices.

13. The hybrid drive system according to claim 1 , wherein the first and second power supply devices are AC-DC converters to convert alternating-current power supplied from an alternating-current overhead wire into direct-current power having a direct-current voltage suitable for the power storage devices.

14. The hybrid drive system according to claim 1 , further comprising a

Assignees

• Mitsubishi Electric Corp

Inventors

• Yamasaki Hisanori
• Wada Yasuhiko
• Kitanaka Hidetoshi
• Hatanaka Keita

Classifications

• Y10S903/93

  Conjoint control of different elements · CPC title

• H02J7/34

  Parallel operation in networks using both storage and other DC sources, e.g. providing buffering (H02J7/14 takes precedence) · CPC title

• B60W20/00

  Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)} · CPC title

• H02J7/00

  Circuit arrangements for charging or discharging batteries or for supplying loads from batteries · CPC title

• B60L9/22

  polyphase motors · CPC title