Comfortable vehicle interior air conditioning is realized while giving an appropriate temperature difference to air blown out from outlets. A vehicle air-conditioning device 1 includes an air mix damper 28, a FOOT outlet 29A, and a VENT outlet 29B. A control device has a B/L mode to blow out air from both of the FOOT outlet and the VENT outlet to a vehicle interior. In the B/L mode, the control device sets a target air volume ratio TGSW to be within a predetermined intermediate range of an air volume ratio SW by the air mix damper, and calculates a target heater temperature TCO on the basis of a target outlet temperature TAO and the target air volume ratio TGSW.

A rotary actuator including a rotatable shaft, at least one processor, and memory storing instructions executable by the processor(s). The instructions, when executed by the processor(s), cause the processor(s) to determine a temperature difference and rotate the rotatable shaft based at least in part on the temperature difference. The temperature difference is between a desired temperature setpoint value and a measured temperature value. The rotation of the rotatable shaft increases or decreases heat contributed by a heat-supplying device when the rotatable shaft is connected to the heat-supplying device.

The present teachings include a heating, ventilation, and air conditioning (HVAC) unit including an evaporator, a heater core, and an airflow control door. The heater core is arranged downstream of the evaporator with respect to a direction of airflow through the HVAC unit. The airflow control door is downstream of both the evaporator and the heater core. The airflow control door is movable to increase and decrease a cross-sectional area of an airflow path downstream of the temperature control door, such as to facilitate mixing of airflow that has passed through the heater core with airflow that has passed around the heater core.

A vehicular climate control system may include a coolant subsystem configured to circulate coolant between an engine, a thermal generator, and a cabin heat exchanger, and a controller. The controller may be configured to, responsive to an air inlet temperature of the heat exchanger exceeding a threshold, retard engine spark timing to increase heat generation. The threshold may be defined by a quotient of (i) a difference between a discharge temperature target and the air inlet temperature and (ii) a thermal effectiveness parameter that is based on an air flow rate and a coolant flow rate.

In a seat air-conditioning device, a refrigeration cycle, a warm air blower, and a cold air blower are housed in a housing disposed between a seat face of a seat and a vehicle interior floor. A condenser is disposed on an upstream side in an air blowing direction and the warm air blower is disposed on a downstream side in an air blowing direction in a warm air flow path extending in a predetermined direction. An evaporator is disposed on a downstream side of the cold air blower in an air blowing direction in the cold air flow path extending in a predetermined direction.

A method for operating a refrigeration system for a vehicle with a refrigerant circuit comprising a heat exchanger, wherein the heat exchanger is flowed through by a controllable environmental air flow (L) and can be operated as refrigerant condenser or gas cooler for a refrigeration system operation.

The present invention relates to an air conditioner for a vehicle, and more particularly, to an air conditioner for a vehicle in which heating performance may be improved using an auxiliary heating heat exchanger and stability of a passenger may be improved by providing the auxiliary heating heat exchanger in an engine room.

Vehicular heat management system includes a refrigerant circulation line including a compressor, a high pressure side indoor heat exchanger, a heat pump mode expansion valve, an outdoor heat exchanger, an air conditioning mode expansion valve, low pressure side indoor heat exchanger and a refrigerant-cooling water heat exchanger; an air conditioning mode branch line branched from the refrigerant circulation line and configured to, in an air conditioning mode, form a cooling loop by circulating a refrigerant through the compressor, the high pressure side indoor heat exchanger, the outdoor heat exchanger, the air conditioning mode expansion valve and low pressure side indoor heat exchanger. Heat pump mode branch line branched from the refrigerant circulation line is configured, in heat pump mode to form a heating loop by circulating the refrigerant through the compressor, the high pressure side indoor heat exchanger, the heat pump mode expansion valve and the refrigerant-cooling water heat exchanger.

An air-conditioning apparatus for an electric vehicle and a method of controlling the same, may include a heat exchanger performing heat exchange between a first fluid and a second fluid while the first fluid and the second fluid flow separately from each other therethrough; a heat source connected to the heat exchanger through a line through which the second fluid flows to allow the second fluid to circulate between the heat exchanger and the heat source, and heating or cooling the second fluid; a circulator imparting a circulation force to the second fluid such that the second fluid circulates between the heat exchanger and the heat source; and a controller determining a required flow rate of the second fluid by use of a flow rate of the first fluid flowing through the heat exchanger and controlling the circulator on the basis of the required flow rate of the second fluid.

A method for digitally controlling a heating arrangement may include receiving a temperature value with a control device, the temperature value reflecting a current outside temperature. The method may also include determining via the control device, based on the received temperature value, a limit output of the heating arrangement that is smaller than a maximum output of the heating arrangement. The method may further include dividing the determined limit output into a plurality of output stages via the control device, a number of the plurality of output stages corresponding to a digital resolution of the control device. The method may additionally include controlling the heating arrangement between a minimum output and the limit output to one of the plurality of output stages.