Fuel economy display control method and fuel economy display control system

A fuel economy display control method for a hybrid vehicle in which driving electric power supplied to a travel motor from a battery is generated by an engine, the fuel economy display control method being executed in a series hybrid mode in which the hybrid vehicle travels only with driving force of the travel motor without using the engine as a traveling driving source, the fuel economy display control method comprising:

• an electric power economy computation step in which an output of the travel motor is computed from an accelerator position in accordance with an accelerator pedal operation amount and instantaneous electric power economy is computed according to the output of the travel motor in response to when the travel motor generates driving force by being supplied current and transmits the driving force to the driving wheels;
• a fuel economy computation step in which instantaneous fuel economy is computed by a conversion factor from the instantaneous electric power economy, the conversion factor set in accordance with an operating state set for the engine, wherein the operating state is determined from a target generated electric power for electric generation by the engine;
• and
• a display step in which the instantaneous fuel economy is displayed on a display device arranged inside a vehicle cabin.

A fuel economy display control method for a hybrid vehicle in which driving electric power supplied to a travel motor from a battery is generated by an engine, the fuel economy display control method being executed in a series hybrid mode in which the hybrid vehicle travels only with driving force of the travel motor without using the engine as a traveling driving source, the fuel economy display control method comprising:

• an electric power economy computation step in which an output of the travel motor is computed from an accelerator position in accordance with an accelerator pedal operation amount and instantaneous electric power economy is computed according to the output of the travel motor in response to when the vehicle is decelerating, in coast traveling, or when the motor output is greater than 0;
• a fuel economy computation step in which instantaneous fuel economy is computed by a conversion factor from the instantaneous electric power economy, the conversion factor set in accordance with an operating state set for the engine, wherein the operating state is determined from a target generated electric power for electric generation by the engine;
• and
• a display step in which the instantaneous fuel economy is displayed on a display device arranged inside a vehicle cabin.