A control system for a hybrid vehicle comprising: an engine configured to generate a torque by burning fuel, wherein an operating point governed by a speed and an output torque can be shifted while maintaining an output power; a generator configured to be driven by the engine to generate electricity; an electric storage device configured to be charged by the electricity generated by the generator; and a drive motor configured to be supplied with the electricity from the electric storage device to generate a torque for propelling the hybrid vehicle; characterized in that: the control system comprises a controller configured to control the operating point of the engine and a charging amount of the electric storage device; and the controller is configured to execute a first determination to determine that a required power (Pd) by a driver to propel the hybrid vehicle is less than a predetermined reference power, execute a second determination to determine that a condition to start the engine is satisfied, set a target power (Pet) of the engine to a predetermined power (Pe) which is greater than the required power (Pd) by the driver, and which can be generated by consuming smaller amount of fuel compared to an amount of the fuel consumed to generate the required power (Pd) by the driver, in a case that answers of both of the first determination and the second determinations are affirmative, operate the generator by the engine being operated to achieve the predetermined power (Pe), and set an electric power (d) generated by the generator to be accumulated in the electric storage device to a value calculated based on a difference between the target power (Pet) and the required power (Pd) by the driver. an engine configured to generate a torque by burning fuel, wherein an operating point governed by a speed and an output torque can be shifted while maintaining an output power; a generator configured to be driven by the engine to generate electricity; an electric storage device configured to be charged by the electricity generated by the generator; and a drive motor configured to be supplied with the electricity from the electric storage device to generate a torque for propelling the hybrid vehicle; characterized in that: the control system comprises a controller configured to control the operating point of the engine and a charging amount of the electric storage device; and the controller is configured to execute a first determination to determine that a required power (Pd) by a driver to propel the hybrid vehicle is less than a predetermined reference power, execute a second determination to determine that a condition to start the engine is satisfied, set a target power (Pet) of the engine to a predetermined power (Pe) which is greater than the required power (Pd) by the driver, and which can be generated by consuming smaller amount of fuel compared to an amount of the fuel consumed to generate the required power (Pd) by the driver, in a case that answers of both of the first determination and the second determinations are affirmative, operate the generator by the engine being operated to achieve the predetermined power (Pe), and set an electric power (d) generated by the generator to be accumulated in the electric storage device to a value calculated based on a difference between the target power (Pet) and the required power (Pd) by the driver. the control system comprises a controller configured to control the operating point of the engine and a charging amount of the electric storage device; and the controller is configured to execute a first determination to determine that a required power (Pd) by a driver to propel the hybrid vehicle is less than a predetermined reference power, execute a second determination to determine that a condition to start the engine is satisfied, set a target power (Pet) of the engine to a predetermined power (Pe) which is greater than the required power (Pd) by the driver, and which can be generated by consuming smaller amount of fuel compared to an amount of the fuel consumed to generate the required power (Pd) by the driver, in a case that answers of both of the first determination and the second determinations are affirmative, operate the generator by the engine being operated to achieve the predetermined power (Pe), and set an electric power (d) generated by the generator to be accumulated in the electric storage device to a value calculated based on a difference between the target power (Pet) and the required power (Pd) by the driver.