A system for a vehicle includes an air conditioning compressor, and a controller configured to operate the compressor based on temperature value, responsive to the temperature values being faulty and refrigerant pressure values exceeding a first threshold, operate the compressor based on the refrigerant pressure values, and responsive to the refrigerant pressure values falling below a second threshold, deactivate the compressor for a rest of a drive cycle.

The auxiliary AC system includes a temperature measurement device configured to generate a variable output based on an air temperature in an environment proximate to the AC system and a compressor control circuit communicably coupled to a variable speed motor. The compressor control circuit is configured to receive the variable output from the temperature measurement device, determine that the output indicates a change in the air temperature, and generate a control signal for the variable speed motor, the control signal including a current having a magnitude depending on the extent of the change to vary a rate at which a compressor pressurizes a refrigerant vapor.

A vehicle air-conditioning device is provided for controlling a vehicle air-conditioning of a vehicle in accordance with a control method. A negative pressure, which is generated in an intake passage of the internal combustion engine by a vacuum servo that assists a brake pedal force, is estimated based on an atmospheric pressure and a pressure inside the intake passage. When a predetermined condition is established that includes a state in which the estimated negative pressure inside the vacuum servo is insufficient relative to a predetermined pressure during operation of the air-conditioning compressor, the air-conditioning compressor is stopped during a first time period, the air-conditioning compressor is operated during a second time period regardless of the predetermined condition after the first time period has elapsed, and operation of the air-conditioning compressor is controlled in accordance the states of the predetermined condition being established after the second time period has elapsed.

An air conditioning system for a vehicle includes a compressor, a condenser fluidically connected to the compressor, an evaporator fluidically connected to the compressor and the condenser, an air moving device positioned to direct a flow of air over the evaporator, a route planning module that provides route planning for the vehicle between a first point and a destination, and an air conditioning controller operatively connected to the compressor, the air moving device, the air conditioning controller including a processor and a non-volatile memory, the processor being operable to deactivate the compressor at a selected point before the vehicle reaches the destination.

A system for controlling a compressor may include an engine controller that controls a fuel injection amount corresponding to an engine load and an opening amount of a throttle by reflecting a required torque required for an air conditioner (A/C), an operation information detector for detecting operation information according to driving state of the vehicle, a compressor that generates pressure during operation of the A/C, an air conditioner relay which is turned on when the air conditioner operates and is turned off when the A/C is stopped, and a controller which determines an engine negative pressure of an intake manifold, and when the cooling water temperature is lower than the predetermined temperature and the intake manifold pressure is lower than the first threshold value, a cold-start intake manifold negative pressure insufficient event is generated to reduce the A/C duty in accordance with the entry into a negative pressure recovery mode.

A vehicle heating, ventilating, and air conditioning (HVAC) system having a variable compressor can reduce a load applied to a vehicle powertrain during certain conditions. Systems and methods can determine if a power state of an HVAC system is activated, and whether an engine water temperature meets a forced HVAC recirculation intake threshold. Responsive to determining that the engine water temperature meets the forced HVAC recirculation intake threshold, a recirculation mode air source can be selected for the HVAC system. Responsive to the recirculation mode air source being selected, determining if at least one measured vehicle condition meets predetermined criteria. Responsive to determining that the at least one measured vehicle condition meets the predetermined criteria, the variable compressor can be operated according to a reduced duty map.

A vehicle air-conditioning device is provided for controlling a vehicle air-conditioning of a vehicle in accordance with a control method. The air-conditioning compressor is stopped for a first time period after a brake pedal transitions from an operated state to a non-operated state when negative pressure inside a vacuum servo is insufficient relative to a predetermined pressure while an air-conditioning compressor is operating, and The air-conditioning compressor is stopped for a second time period after the acceleration pedal has come to be in a non-operated state when an acceleration pedal is operated before the first time period elapses.

A vehicle air-conditioning device is provided for controlling a vehicle air-conditioning of a vehicle in accordance with a control method. A negative pressure, which is generated in an intake passage of the internal combustion engine by a vacuum servo that assists a brake pedal force, is estimated based on an atmospheric pressure and a pressure inside the intake passage. When a predetermined condition is established that includes a state in which the estimated negative pressure inside the vacuum servo is insufficient relative to a predetermined pressure during operation of the air-conditioning compressor, the air-conditioning compressor is stopped during a first time period, the air-conditioning compressor is operated during a second time period regardless of the predetermined condition after the first time period has elapsed, and operation of the air-conditioning compressor is controlled in accordance the states of the predetermined condition being established after the second time period has elapsed.

An integrated thermal management system includes a cooling circuit having a component thermal conditioning circuit, a battery thermal conditioning circuit, a cabin heating circuit, a cabin cooling circuit and a valve group configured for selectively interconnecting or isolating the component thermal conditioning circuit, the battery thermal conditioning circuit, the cabin heating circuit and the cabin cooling circuit.

An air conditioning system of a vehicle having an internal combustion engine includes a condenser configured to receive refrigerant output by an electric compressor and transfer heat from the refrigerant within the condenser to air passing the condenser. A first evaporator is configured to receive refrigerant from the condenser when a first control valve is open and transfer heat from air passing the first evaporator to the refrigerant within the first evaporator. A first blower is configured to blow air across the first evaporator to a first section of a cabin of the vehicle. A second evaporator is configured to receive refrigerant from the condenser when a second control valve is open and transfer heat from air passing the second evaporator to the refrigerant within the second evaporator. A second blower is configured to blow air across the second evaporator to a second section of the cabin of the vehicle.