Apparatus and method for controlling charging and discharging of an energy storage device

• US 20040232883A1
• Filed: 05/19/2004
• Published: 11/25/2004
• Est. Priority Date: 05/21/2003
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Asami, Kiyoshi, Ochiai, Shinobu, Shiraishi, Tomohiro
• Granted Patent: US 7,102,330 B2
• Time in Patent Office: Days
• US Class Current: 320/125
• CPC Class Codes: B60L 58/10 for monitoring or controlling batteries
• CPC Class Codes: H02J 7/007182 in response to battery voltage
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

An apparatus and method for controlling charging and discharging of an energy storage device. If the charging voltage that is applied exceeds a restriction determining voltage, the power value at that time is held as the charging power upper limit value. In addition, by multiplying a restriction coefficient by the charging power upper limit value while gradually reducing the restriction coefficient until the voltage drops below a restriction removal determining voltage. By setting its result as a control target value of the charging power, the charging power is gradually restricted. In contrast, if the applied charging voltage drops below the restriction removal determining voltage, the charging power is conversely gradually restored to its original state using a control target value obtained by multiplying the restriction coefficient by the charging power upper limit value while gradually increasing the restriction coefficient until the voltage equals or goes above the restriction determining voltage.

Claims

1. A charging and discharging control apparatus that controls charging and discharging of an energy storage device by a load that is connected to the energy storage device, comprising:

an upper limit power setting device that, when a charging voltage that is applied to the energy storage device exceeds a restriction determining voltage that is set in order to start a restriction of charging power to the energy storage device, sets a charging power value at that point as an upper limit power value for the charging power;

a power restricting device that multiplies a restriction coefficient by the upper limit power value while gradually reducing the restriction coefficient using a predetermined reduction width until the charging voltage drops below the restriction determining voltage, and, by setting a result thereof in the load as a control target value of the charging power, restricts the charging power; and

a restriction removal device that, when the charging voltage drops below a restriction removal determining voltage that is set in order to remove a restriction on the charging power, multiplies the restriction coefficient by the upper limit power value while gradually increasing the restriction coefficient using a predetermined increase width, and, by setting a result thereof in the load as a control target value of the charging power, removes the restriction on the charging power, wherein

the reduction width of the restriction coefficient in the power restricting device is set to be larger than the increase width of the restriction coefficient in the restriction removal device.

2. The charging and discharging control apparatus according to claim 1, wherein, if the charging voltage again exceeds the restriction determining voltage, the upper limit power setting device updates the upper limit power value if the charging power value at this time is smaller than the upper limit power value that is stored.

3. The charging and discharging control apparatus according to claim 1, wherein, if the charging voltage again exceeds the restriction determining voltage, the power restricting device makes the reduction width of the restriction coefficient that is set at this time smaller than the reduction width of the restriction coefficient that was set when the charging voltage previously exceeded the restriction determining voltage.

4. The charging and discharging control apparatus according to claim 1, wherein if the charging voltage again drops below the restriction removal determining voltage, the restriction removal device makes the increase width of the restriction coefficient that is set at this time smaller than the increase width of the restriction coefficient that was set when the charging voltage previously dropped below the restriction removal determining voltage.

5. A charging and discharging control apparatus that controls charging and discharging of an energy storage device by a load that is connected to the energy storage device, comprising:

an upper limit power setting device that, when a discharging voltage that is output from the energy storage device drops below a restriction determining voltage that is set in order to start a restriction of discharging power from the energy storage device, sets a discharging power value at that point as an upper limit power value for the discharging power;

a power restricting device that multiplies a restriction coefficient by the upper limit power value while gradually reducing the restriction coefficient using a predetermined reduction width until the discharging voltage goes above the restriction determining voltage, and, by setting a result thereof in the load as a control target value of the discharging power, restricts the discharging power; and

a restriction removal device that, when the discharging voltage goes above a restriction removal determining voltage that is set in order to remove a restriction on the discharging power, multiplies the restriction coefficient by the upper limit power value while gradually increasing the restriction coefficient using a predetermined increase width, and, by setting a result thereof in the load as a control target value of the discharging power, removes the restriction on the discharging power, wherein

the reduction width of the restriction coefficient in the power restricting device is set to be larger than the increase width of the restriction coefficient in the restriction removal device.

6. The charging and discharging control apparatus according to claim 5, wherein, if the discharging voltage again drops below the restriction determining voltage, the upper limit power setting device updates the upper limit power value if the discharging power value at this time is smaller than the upper limit power value that is stored.

7. The charging and discharging control apparatus according to claim 5, wherein, if the discharging voltage again drops below the restriction determining voltage, the power restricting device makes the reduction width of the restriction coefficient that is set at this time smaller than the reduction width of the restriction coefficient that was set when the discharging voltage previously dropped below the restriction determining voltage.

8. The charging and discharging control apparatus according to claim 5, wherein if the discharging voltage again exceeds the restriction removal determining voltage, the restriction removal device makes the increase width of the restriction coefficient that is set at this time smaller than the increase width of the restriction coefficient that was set when the discharging voltage previously exceeded the restriction removal determining voltage.

9. A charging and discharging control method for controlling charging and discharging of an energy storage device by a load that is connected to the energy storage device, comprising:

upper limit power setting processing in which, when a charging voltage that is applied to the energy storage device exceeds a restriction determining voltage that is set in order to start a restriction of charging power to the energy storage device, a charging power value at that point is set as an upper limit power value for the charging power;

power restricting processing in which a restriction coefficient is multiplied by the upper limit power value while the restriction coefficient is gradually reduced using a predetermined reduction width until the charging voltage drops below the restriction determining voltage, and a result thereof is set in the load as a control target value of the charging power, so as to restrict the charging power; and

restriction removal processing in which, when the charging voltage drops below a restriction removal determining voltage that is set in order to remove a restriction on the charging power, the restriction coefficient is multiplied by the upper limit power value while the restriction coefficient is gradually increased using a predetermined increase width, and a result thereof is set in the load as a control target value of the charging power, so as to remove the restriction on the charging power, wherein

the reduction width of the restriction coefficient in the power restricting processing is set to be larger than the increase width of the restriction coefficient in the restriction removal processing.

10. A charging and discharging control method for controlling charging and discharging of an energy storage device by a load that is connected to the energy storage device, comprising:

upper limit power setting processing in which, when a discharging voltage that is output from the energy storage device drops below a restriction determining voltage that is set in order to start a restriction of discharging power from the energy storage device, a discharging power value at that point is set as an upper limit power value for the discharging power;

power restricting processing in which a restriction coefficient is multiplied by the upper limit power value while the restriction coefficient is gradually reduced using a predetermined reduction width until the discharging voltage goes above the restriction determining voltage, and a result thereof is set in the load as a control target value of the discharging power, so as to restrict the discharging power; and

restriction removal processing in which, when the discharging voltage goes above a restriction removal determining voltage that is set in order to remove a restriction on the discharging power, the restriction coefficient is multiplied by the upper limit power value while the restriction coefficient is gradually increased using a predetermined increase width, and a result thereof is set in the load as a control target value of the discharging power, so as to remove the restriction on the discharging power, wherein

the reduction width of the restriction coefficient in the power restricting processing is set to be larger than the increase width of the restriction coefficient in the restriction removal processing.