Fuel cell system

Patent metadata

Field	Value
Publication number	US-2017355278-A1
Application number	US-201715602547-A
Country	US
Kind code	A1
Filing date	May 23, 2017
Priority date	Jun 8, 2016
Publication date	Dec 14, 2017
Grant date	—

Abstract

A fuel cell system includes a drive motor, a fuel cell, an auxiliary machine, a secondary battery, a temperature sensor, a current sensor, and a control section. The control section controls the secondary battery for discharging by driving the drive motor or the auxiliary machine and for charging through power generation by the fuel cell or regeneration by the drive motor when a temperature measured by the temperature sensor is lower than a specified value.

First claim

What is claimed is:

1 . A fuel cell system comprising:
a drive motor that generates a driving force of a mobile object and regenerates kinetic energy of the mobile object to electrical energy; a fuel cell that supplies drive power to the drive motor; an auxiliary machine that is used for power generation by the fuel cell; a secondary battery that supplies the drive power to the drive motor and the auxiliary machine; a temperature sensor that measures a temperature of the secondary battery; a current sensor that measures a discharged current of the secondary battery; and a control section that is configured to perform a discharging of the secondary battery through driving the drive motor or driving the auxiliary machine and to perform a charging of the secondary battery through the power generation by the fuel cell or regeneration by the drive motor when the temperature measured by the temperature sensor is lower than a specified value, wherein the control section stops the discharging and performs the charging in cases where an integrated value of the discharged current, which is measured by the current sensor, is smaller than a specified upper limit value and then the integrated value reaches the specified upper limit value when the discharging is performed, and stops the charging and performs the discharging in cases where the integrated value of the discharged current, which is measured by the current sensor, exceeds a specified lower limit value and then the integrated value reaches the specified lower limit value when the charging is performed.

2 . The fuel cell system according to claim 1 further comprising:
a speed sensor that acquires a measured value of a speed of the mobile object, wherein
the control section controls the discharging and the charging such that amounts of the discharging and the charging per unit time are decreased as the speed measured by the speed sensor is increased.

3 . The fuel cell system according to claim 2 , wherein
a fluctuation in demanded power for the secondary battery is set such that the fluctuation in the demanded power for the secondary battery is decreased as the speed measured by the speed sensor is increased.

4 . The fuel cell system according to claim 1 , wherein
the control section determines an amounts of the discharging and the charging per unit time in accordance with the temperature of the secondary battery, which is measured by the temperature sensor, and controls the discharging and the charging.

5 . The fuel cell system according to claim 4 , wherein
the control section controls the discharging and the charging such that the amounts of the discharging and the charging per unit time are decreased as the temperature of the secondary battery is increased.

6 . The fuel cell system according to claim 4 , wherein
the control section controls the discharging and the charging such that the amounts of the discharging and the charging per unit time are decreased as the temperature of the secondary battery is decreased.

7 . A fuel cell system comprising:
a drive motor that generates a driving force of a mobile object and regenerates kinetic energy of the mobile object to electrical energy; a fuel cell that supplies drive power to the drive motor; an auxiliary machine that is used for power generation by the fuel cell; a secondary battery that supplies the drive power to the drive motor and the auxiliary machine; a temperature sensor that measures a temperature of the secondary battery; a current sensor that measures a charged current of the secondary battery; and a control section that is configured to perform a discharging of the secondary battery through driving the drive motor or driving the auxiliary machine and to perform a charging of the secondary battery through the power generation by the fuel cell or regeneration by the drive motor when the temperature measured by the temperature sensor is lower than a specified value, wherein the control section stops the charging and performs the discharging in cases where an integrated value of the charged current, which is measured by the current sensor, is smaller than a specified upper limit value and then the integrated value reaches the specified upper limit value when the charging is performed, and stops the discharging and performs the charging in cases where the integrated value of the charged current, which is measured by the current sensor, exceeds a specified lower limit value and then the integrated value reaches the specified lower limit value when the discharging is performed.

Assignees

• Toyota Motor Co Ltd

Inventors

• Fukami Tatsuya
• Aso Shinji
• Watanabe Takao

Classifications

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• H02J7/1438

  in combination with power supplies for loads other than batteries · CPC title

• B60L2240/545

  Temperature · CPC title

• H01M16/006

  of fuel cells with rechargeable batteries · CPC title

• H01M2250/20

  Fuel cells in motive systems, e.g. vehicle, ship, plane · CPC title