Power supply system for vehicle

• US 10,220,720 B2
• Filed: 07/15/2016
• Issued: 03/05/2019
• Est. Priority Date: 07/30/2015
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ishishita, Teruo, Mano, Ryo, Obata, Hiroyuki, Ogura, Takashi
• Primary Examiner(s): Zhou, Zixuan
• Application Number:
  US15/211,287
• Publication Number:
  US 20170028867A1
• Time in Patent Office: 963 Days
• Field of Search: 320109, 320132, 320151, 320152, 320159, 320164, 701 22, 180 6529
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A power supply system includes a controller. The controller is configured to; a) control charging and discharging of an electrical storage device upon reception of an output of a current sensor and a voltage sensor, b) calculate a control current value by subtracting an offset value from a detected value of the current sensor, c) calculate a first determination result and a second determination result, respectively obtained by determining whether the electrical storage device is being charged or discharged based on the control current value, and based on a change in a remaining amount of charge of the electrical storage device, and d) when the first determination result and the second determination result differ from each other, change the offset value such that the first determination result coincides with the second determination result.

Claims

1. A power supply system for a vehicle, the power supply system comprising:

an electrical storage device;

a current sensor configured to detect a charge current and a discharge current of the electrical storage device;

a voltage sensor configured to detect a voltage of the electrical storage device; and

a controller configured to

a) control charging and discharging of the electrical storage device upon reception of an output of the current sensor and an output of the voltage sensor,

b) calculate a control current value by subtracting an offset value from a detected value of the current sensor, the control current value being a value that is used in control that is executed by the controller,

c) calculate a first determination result and a second determination result, the first determination result being obtained by determining whether the electrical storage device is being charged or discharged based on the control current value, the second determination result being obtained by determining whether the electrical storage device is being charged or discharged based on a change in a remaining amount of charge of the electrical storage device, the remaining amount of charge being calculated based on the output of the voltage sensor, and

d) when the first determination result and the second determination result differ from each other, execute a process of changing the offset value such that the first determination result coincides with the second determination result.

2. The power supply system according to claim 1, wherein

the controller is configured not to execute the process of changing the offset value when the remaining amount of charge of the electrical storage device is higher than a predetermined value, and

the controller is configured to execute the process of changing the offset value when the remaining amount of charge of the electrical storage device is lower than the predetermined value.

3. The power supply system according to claim 1, wherein

the controller is configured to, when the first determination result indicates that the electrical storage device is being charged and the second determination result indicates that the electrical storage device is being discharged, change the offset value such that a charge current value is reduced.

4. The power supply system according to claim 1, wherein

the controller is configured not to execute the process of changing the offset value when the remaining amount of charge of the electrical storage device is lower than a predetermined value, and

the controller is configured to execute the process of changing the offset value when the remaining amount of charge of the electrical storage device is higher than the predetermined value.

5. The power supply system according to claim 1, wherein the controller is configured to, when the first determination result indicates that the electrical storage device is being discharged and the second determination result indicates that the electrical storage device is being charged, change the offset value such that a discharge current value is reduced.