Systems and method relate to a fuel efficient automatic temperature control system. The system includes a climate control system configured to heat or cool air. The climate control system includes a condenser and a variable-speed fan. A first sensor provides vent-air information indicative of a condition of the air. An automatic temperature controller receives an indication of a desired temperature, receives the vent-air information, determines whether the variable-speed fan should operate at a maximum fan speed based on at least the desired temperature and the vent-air information and determines whether a dehumidifying operation is requested. If the variable-speed fan is required to operate at the maximum fan speed or a dehumidifying operation is requested, the fan operates at the maximum speed. If the variable-speed fan is not required to operate at the maximum fan speed and a dehumidifying operation is not requested, the fan operates below the maximum fan speed.

A method of controlling the temperature of a controller of an electric compressor for an air conditioner in a vehicle is provided, which prevents an excessive increase in temperature of the controller under the control of an output current of the controller. The method includes a temperature-determination stage of detecting the temperature of the controller and determining whether or not the detected temperature is equal to or lower than a reference temperature that is lower than a predefined target temperature by a specified number of degrees when an actuating signal of the air conditioner is generated in a switched-on stage of a vehicle. A current-control stage controls an output current of the controller to decrease the temperature until the detected temperature reaches the reference temperature or lower if the detected temperature is determined to be higher than the reference temperature.

An air conditioning device for vehicle includes a first water-refrigerant heat exchanger, a second water-refrigerant heat exchanger, a first bypass passage and a second bypass passage. The first bypass passage branches at a point of a coolant passage from a cooling portion of a heating component the vehicle to the second water-refrigerant heat exchanger, and the first bypass passage is capable of being communicated with the coolant passage at an upstream side of the first water-refrigerant heat exchanger. The second bypass passage bran at a point of the coolant passage from a heater core to the first water-refrigerant heat exchanger, and the second bypass passage is capable of being communicated with the coolant passage at a downstream side of the first water-refrigerant heat exchanger. A part of the first bypass passage which includes a downstream end and a part of the second bypass passage which includes an upstream end are shared.

A method of preventing damage to a compressor in a vehicle is provided. The method broadly includes the steps of: (a) sensing a temperature (T.sub.D) of a compressor discharge fluid; (b) identifying a time (t.sub.a) when the sensed temperature (T.sub.D) is greater than a first threshold temperature (T.sub.1); (c) initiating a first action at a time (t.sub.1) if the sensed temperature (T.sub.D) remains greater than the first threshold temperature (T.sub.1); (d) initiating a second action at a time (t.sub.2) if the sensed temperature (T.sub.D) remains greater than the first threshold temperature (T.sub.1); (e) initiating a third action at a time (t.sub.3) if the sensed temperature (T.sub.D) remains greater than the first threshold temperature (T.sub.1); and (f) initiating a fourth action at a time (t.sub.4) if the sensed temperature (T.sub.D) remains greater than the first threshold temperature (T.sub.1). The method may further include the step of turning the compressor off when the sensed temperature (T.sub.D) of the compressor discharge fluid is greater than a second threshold temperature (T.sub.2).

A method for controlling a thermal conditioning system includes a heat-transfer fluid circuit and a refrigerant circuit. The refrigerant circuit includes an electric compressor, a first heat exchanger, a first pressure reducer, a second heat exchanger, and a bypass branch for returning a refrigerant at the outlet of the compressor to the second exchanger and a second pressure reducer. The method includes receiving a thermal power setpoint for delivering thermal power to a heat-transfer fluid; determining an electrical power setpoint for delivering electrical power to the compressor; determining a suction pressure setpoint for the compressor; controlling a flow cross-section of the second pressure reducer so that the suction pressure of the compressor is equal to the determined suction pressure setpoint; and controlling a flow cross-section of the first pressure reducer so that the refrigerant at the inlet of the compressor is in the superheated vapour state.

A method and system are provided and include determining a sensed condition. When the sensed condition is below a first threshold and above a second threshold, the second threshold being less than the first threshold, a flow of coolant is started in a coolant loop comprising a first portion of a first heat exchanger. A flow of refrigerant is started in a refrigerant loop by starting a compressor within the refrigerant loop at a first speed.

A refrigerant circulation system which circulates CO.sub.2-containing refrigerant therethrough includes a compressor which compresses the refrigerant, a motor, a motor speed sensor which detects a rotational speed of the motor, and a control device which controls at least the motor. The motor includes a rotor, a stator, a rotation shaft coupled to the rotor, and slide bearings supporting the rotation shaft and being lubricated using the refrigerant compressed by the compressor, and is configured so that the refrigerant passing through the motor expands after flowing out of the slide bearings and is used for cooling one of the rotor and the stator. The motor further includes a flow rate adjustment mechanism which adjusts a flow rate of the refrigerant. The control device controls the flow rate adjustment mechanism to adjust the flow rate of the refrigerant according to the rotational speed detected by the motor speed sensor.

One embodiment relates to an automotive thermal management fluid module using a circulating fluid, such as a refrigerant or coolant, the module comprising: a manifold plate having a plurality of fluid passages formed therein; and a thermal interference avoidance unit that is coupled to the manifold plate, wherein fluid passages having a relatively high or low temperature from among the fluid passages are formed separately other fluid passages.

A thermal system includes a high temperature coolant loop thermally coupled to a heater core configured for thermal exchange with an airflow into a cabin of the vehicle, and an air conditioning (A/C) loop having a compressor, a condenser, a first expansion device for a heat exchanger, a second expansion device for a chiller, and a third expansion device for an evaporator. The high temperature coolant loop is thermally coupled to the condenser. A controller includes one or more processors and is programmed to perform a window fogging prevention operation by controlling a speed of the compressor such that (i) a coolant temperature at the heater core reaches a first predetermined target temperature, and (ii) a coolant temperature at the evaporator does not fall below a second predetermined target temperature.

A thermal management system, a method of controlling the same, a compressor included in the same in which the thermal management system and the method of controlling the thermal management system determine whether the current state is a low-refrigerant state in which a refrigerant amount is smaller than a reference refrigerant amount on the basis of a degree of superheat or a degree of supercooling detected from a pressure and temperature of a refrigerant when a battery thermal management mode is operated and operations of cooling and heating a vehicle interior do not operate. The compressor is included in the thermal management system and configured as an electric compressor configured to be controlled by the control method. Therefore, it is possible to easily recognize whether the current state is the low-refrigerant state in which the refrigerant amount is smaller than the reference refrigerant amount.