Electricity storage controller for vehicles

• US 7,409,276 B2
• Filed: 03/31/2003
• Issued: 08/05/2008
• Est. Priority Date: 06/21/2002
• Status: Expired due to Term

• Current Assignee: Nissan Diesel Motor Co., Ltd. (Isuzu Motors Limited)
• Original Assignee: Nissan Diesel Motor Co., Ltd. (Isuzu Motors Limited)
• Inventors: Nishina, Mitsuhiro, Miyata, Tatsuji, Nakane, Masayuki
• Primary Examiner(s): Tran; Dalena
• Application Number:
  US10/518,176
• Publication Number:
  US 20060080012A1
• Time in Patent Office: 1,954 Days
• Field of Search: 701/36, 320103-105, 320/116, 320118-123, 320/132, 320/111, 320/114, 320/115, 320/117
• US Class Current: 701/36
• CPC Class Codes: B60L 53/11 DC charging controlled by the charging station, e.g. mode 4
• CPC Class Codes: H02J 7/0016 using shunting, discharge or bypass circuits
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A rotary electric machine (1) which constitutes a prime bar of a vehicle and an electricity storage device (10) serving as a main power source of the rotary electric machine (1) and composed of a plurality of capacitor modules (11) in which a plurality of capacitor cells make one set are provided. A hybrid control unit (3) which comprises a means for calculating assigned voltages of the capacitor modules, a means for calculating an average value of the assigned voltages of the capacitor module, and a means for equalizing the assigned voltages of the capacitor modules based on the average value. By restricting a difference among the assigned voltages of the capacitor modules (11), it is possible to fully utilize a capacity of the electricity storage device (10).

Claims

1. An electricity storage controller for a vehicle comprising:

a rotary electric machine serving as a prime mover of the vehicle;

an electricity storage device serving as a main power source of the rotary electric machine and including a power storage module which contains plural storage cells that are connected in series;

means for determining assigned voltages of the storage cells;

means for calculating an average value of the assigned voltages; and

means for equalizing the assigned voltages the storage cells based on the average value, the means for equalizing including;

a plurality of bypass circuits, which are normally open, and which are connected in parallel with respective ones of the storage cells;

means for setting a bypass reference voltage based on the average value of the assigned voltages of the storage cells; and

means for closing the bypass circuits of the storage cells if their assigned voltage exceeds the bypass reference voltage.

2. An electricity storage controller for a vehicle according to claim 1, further comprising means for determining whether or not vehicle conditions allow closing of the bypass circuits, and wherein the bypass circuits can be closed only when the determination means makes an affirmative determination.

3. An electricity storage controller for a vehicle according to claim 2, wherein the determination means does not allow an affirmative determination when a temperature of the storage module is outside a normal range.

4. An electricity storage controller for a vehicle according to claim 2, wherein the vehicle include an inverter between the rotary electric machine and the electricity storage device, and wherein the determination means does not allow an affirmative determination when an inverter current of the inverter is greater than a stipulated value.

5. An electricity storage controller for a vehicle according to claim 1, wherein each bypass circuit comprises a resistance and a bypass transistor.

6. An electricity storage controller for a vehicle according to claim 1, wherein the means for calculating assigned voltages comprises means for detecting the cell voltage of each storage cell and means for summing up the detected values.

7. An electricity storage controller for vehicles according to claim 6, further comprising at least one additional power storage module, and wherein the means for calculating an average value comprises means for summing up a total voltage of the modules and means for dividing the total value by the number of modules.

8. An electricity storage controller for a vehicle according to claim 1, further comprising at least one additional power storage module, and wherein the means for calculating an average value comprises means for dividing an average value of assigned voltages of the capacitor modules by the number of modules.

9. An electricity storage controller for vehicles according to claim 1, wherein the power storage module is a capacitor module and the storage cells are capacitor cells.