| CPC B60H 1/00849 (2013.01) [B60H 1/00764 (2013.01); B60H 1/00828 (2013.01); B60H 1/00842 (2013.01)] | 11 Claims |
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1. A method for controlling a heating, ventilation, and air conditioning (HVAC) system including a housing having an outdoor air inlet through which outdoor air is allowed to draw in and an indoor air inlet through which indoor air of a vehicle is allowed to draw in, an inlet door for opening or closing the outdoor air inlet and the indoor air inlet, an evaporator mounted in the housing, a compressor fluidically connected to the evaporator, a heater-side passage and a bypass passage formed in parallel in the housing on a downstream of the evaporator, a heater core mounted within the heater-side passage, a temperature door pivotally mounted between the heater-side passage and the bypass passage and configured for opening or closing the heater-side passage and the bypass passage, and an air blower blowing air into the housing, the method comprising:
setting, by a controller, a duty cycle of the compressor to 100% for a predetermined time period based on a stop signal of an engine received from an Idle Stop and Go (ISG) system;
controlling, by the controller, the ISG system to stop the engine;
allowing, by the controller, only the indoor air to be directed into the housing by controlling the inlet door, in response that the HVAC system operates in a cooling mode and the engine is stopped by the ISG system;
allowing, by the controller, the indoor air directed into the housing to bypass the heater core, by controlling the temperature door; and
maintaining, by the controller, a flow rate of the air directed into the housing at a minimum flow rate, by controlling the air blower.
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