Drive controller of hybrid vehicle, and drive controlling method for hybrid vehicle

A drive controller of a hybrid vehicle driven by using an electric motor and an engine that is an internal combustion engine, the drive controller comprising:

• a storage unit, the storage unit comprising:
• a power consumption rate map, the power consumption rate map, determined by a simulation and stored in advance, storing a relationship between a gradient of a path and speed of the vehicle and a power consumption rate of the electric motor;
• a power consumption difference threshold map, the power consumption difference threshold map, determined by a simulation and stored in advance, storing a relationship between a traveling distance the vehicle is expected to travel and a power consumption difference threshold;
• a temperature detection unit that detects a temperature of the electric motor;
• an environment information acquiring unit that acquires traveling environment information on the vehicle, the environment information acquiring unit determining power consumption difference thresholds by referring to the power consumption difference threshold map and on the traveling environment information including a first traveling distance, a first gradient of a first section of the path, a second traveling distance, and a second gradient of a second section of the path;
• a power consumption calculation unit that receives, from the environment information acquiring unit, information about a first section that is a path where heat generation by the electric motor is expected and about a second section that is a path where heat generation by the electric motor is less than heat generation by the electric motor in the first section, the power consumption calculation unit calculating power consumption by the electric motor in the first section and in the second section by referring to the power consumption rate map, on the speed of the vehicle, and a gradient of the first section and the second section;
• and
• a vehicle control unit that controls output torque of the electric motor in the first section, based on the temperature of the electric motor detected by the temperature detection unit and on the power consumption calculated by the power consumption calculation unit, to change a drive ratio of the engine;
• wherein the power consumption calculation unit compares a difference of a power consumption rate of the first section and a power consumption rate of the second section with the power consumption difference threshold, the power consumption difference threshold being a criterion for changing the drive ratio of the engine.