Vehicle air conditioning control system

A vehicle air conditioning control system comprising:

• an electric heater configured to apply heat to an air conditioning airflow to be blown out into a space in a vehicle compartment;
• a direct-current-to-direct-current converter configured to convert a voltage of electric power from an in-vehicle battery into a predetermined voltage;
• an engine system temperature sensor configured to measure a temperature of at least one of an engine or a member related to the engine;
• a converter system temperature sensor configured to measure a temperature of a member related to cooling of the direct-current-to-direct-current converter;
• and
• a controller configured to control an operating state of the electric heater based on the temperature measured by the engine system temperature sensor, wherein
• the direct-current-to-direct-current converter is configured to output either a steady-state current or a short-time current, the short-time current having a current value higher than a current value of the steady-state current and being output for a predetermined time period or less, and
• the controller is configured to, upon determining, based on the temperature, that the electric heater is to operate, switch the operating state between a first operating state and a second operating state, the first operating state being an operating state in which the electric heater is turned on and the direct-current-to-direct-current converter is caused to output the short-time current, the second operating state being an operating state in which the electric heater is turned off and the direct-current-to-direct-current converter is caused to output the steady-state current, and
• the controller is further configured to change a time period depending on the temperature measured by the converter system temperature sensor, the time period for which the electric heater is turned on.