Hybrid vehicle control method and hybrid vehicle control device

A method for controlling a hybrid vehicle, wherein the hybrid vehicle comprises:

• an internal combustion engine for power generation;
• a first cooling path in which a first refrigerant which is capable of cooling the internal combustion engine is circulated;
• a battery for charging and discharging electric power;
• a second cooling path in which a second refrigerant which is capable of cooling the battery is circulated;
• a heat exchanger for performing heat exchange between the first refrigerant and the second refrigerant;
• and a control valve provided in the first cooling path, and configured to supply the first refrigerant to the heat exchanger in a valve opening state and to stop supplying the first refrigerant to the heat exchanger in a valve closing state, the hybrid vehicle control method comprising:
• starting the internal combustion engine and opening the control valve to perform the heat exchange between the first refrigerant and the second refrigerant when the battery reaches at a preset predetermined SOC and an output of the battery is lower than a preset predetermined first threshold value, when the internal combustion engine has been stopped;
• calculating a requested heat amount requested for warm-up of the battery from a temperature of the battery and a heat capacity of the battery;
• and
• controlling a rotation speed, a load and a drive time of the internal combustion engine according to the requested heat amount.

A hybrid vehicle control system, comprising:

• an internal combustion engine for power generation;
• a first cooling path in which a first refrigerant which is capable of cooling the internal combustion engine is circulated;
• a battery for charging and discharging electric power;
• a second cooling path in which a second refrigerant which is capable of cooling the battery is circulated;
• a heat exchanger for performing heat exchange between the first refrigerant and the second refrigerant;
• a control valve provided in the first cooling path, and configured to supply the first refrigerant to the heat exchanger in a valve opening state and to stop supplying the first refrigerant to the heat exchanger in a valve closing state;
• and
• a controller configured to:
• start the internal combustion engine and open the control valve to perform the heat exchange between the first refrigerant and the second refrigerant when the battery reaches at a preset predetermined SOC and an output of the battery is lower than a preset predetermined first threshold value, when the internal combustion engine has been stopped;
• calculate a requested heat amount requested for warm-up of the battery from a temperature of the battery and a heat capacity of the battery;
• and
• control a rotation speed, a load and a drive time of the internal combustion engine according to the requested heat amount.