Charging/discharging control device

A charging/discharging control device configured to control charging and discharging of a battery installed in a hybrid vehicle that includes a motor generator, the motor generator being a power source, the charging/discharging control device comprising:

• a route information acquisition unit configured to acquire a planned travel route, a start point of the planned travel route being a current position;
• a section identification unit configured to estimate a change in a state of charge of the battery using a change in potential energy on the planned travel route and identify an excessive discharging section and an excessive charging section on the planned travel route;
• and
• a charging/discharging control unit configured to control charging and discharging of the battery by controlling an output of the motor generator, wherein
• the excessive charging section includes a section where the state of charge continues to rise to a maximum state of charge and is then maintained at the maximum state of charge,
• the excessive discharging section includes a section where the state of charge continues to fall to a minimum state of charge and is then maintained at the minimum state of charge,
• the charging/discharging control unit is configured to limit a charge current value in the excessive charging section to a fixed first upper limit value, wherein the first upper limit value is set such that the state of charge reaches the maximum state of charge at an end point of the excessive charging section when the charge current value in the excessive charging section is maintained at the first upper limit value, and
• the charging/discharging control unit is further configured to limit a discharge current value in the excessive discharging section to a fixed second upper limit value, wherein the second upper limit value is set such that the state of charge reaches the minimum state of charge at an end point of the excessive discharging section when the discharge current value in the excessive discharging section is maintained at the second upper limit value.