An automotive HVAC system includes upper and lower mode cases configured to discharge separate streams of temperature-conditioned air into front and rear passenger zones. The system separates the inlet air into separate mixing chambers, and a third stream through a heater core. Blend doors control hot and cold air streams entering their respective mixing chambers. Operation is controlled by reading requested temperature, blower rate and mode for system zone outlet, converting requests to a flowrate, calculating total flowrate as a summation of all requests, employing a math model to calculate total zonal flowrate as a summation of all zonal flowrates, calculating a blower control error as a function of the difference between total blower request and total zonal flowrate, modifying the operating state using the calculated control error, positioning and resetting the mode valves into defrost, heater and vent openings, and resetting the mode valves.

HVAC unit has a single blower fan, an evaporator downstream of the blower and a heater downstream of the evaporator, wherein each zone outlet includes a temperature mixing door for controlling portions of hot and cold air and an output valve for controlling a zonal output flow rate. A method is devised to control the discharge of temperature-conditioned air from a plurality of zone outlets of an automotive HVAC system via such an HVAC unit by the steps of reading an operator-requested zonal discharge blower level for each of the zone outlets; converting each zonal discharge blower level request to a zonal flowrate request; calculating a total requested output flowrate as a summation of all zonal flowrate requests; and adjusting a blower voltage to a minimum voltage required for generating the total requested output flowrate.

An abnormality diagnosis device that performs an abnormality diagnosis on a blower system that sends air to a plurality of air receiving objects obtains a target operating state of an airflow control device that controls airflow to the air receiving objects, obtains a temperature detected by a temperature sensor that detects a first temperature as a temperature of air fed to a first air receiving object as one of the air receiving objects or a temperature of the first air receiving object, estimates the first temperature, based on the target operating state of the airflow control device, and performs abnormality diagnosis on the airflow control device. The abnormality diagnosis device determines that there is an abnormality in the airflow control device, when a difference between the detected first temperature and the estimated first temperature is equal to or larger than a predetermined first reference value.

In order to provide a motor vehicle, the roof of which is composed of a transparent material at least in some sections, wherein persons located in the motor vehicle are cooled by means of escaping air, air outlet openings are formed on both sides on opposite roof frame longitudinal segments, in each case in accordance with the number of seat rows. Air lines are provided, which convey air conditioned by at least one present air conditioning system to at least one air outlet opening. Sensors that detect occupancy of the present seats by a person are provided, and a controller for the present air conditioning system is provided, which adjusts an air conditioning system from the number of present air conditioning systems in such a way that an air flow having a predetermined temperature and having a predetermined air outlet speed is applied to an upper region of a person located on a seat.

In a rotary door of a vehicular air conditioner, an outer peripheral portion closes a defroster blowing opening and another outer peripheral portion closes a foot blowing opening in a face mode. A first door opening communicates with an inlet opening and a second door opening communicates with a face blowing opening. A cross-sectional area of a flow path through which the airflow passes through the inlet opening and the first door opening is equal to a cross-sectional area of a flow path through which the airflow passes through the face blowing opening and the second door opening.

A HVAC system for a vehicle that includes a propulsion system, a frame, a passenger compartment, and a door coupled to the frame. The HVAC system includes a refrigeration circuit that selectively controls the temperature of the passenger compartment based on a sensed temperature within the passenger compartment. The refrigeration circuit includes an exterior heat exchanger, a first air moving device coupled to the exterior heat exchanger, an interior heat exchanger, a second air moving device coupled to the interior heat exchanger, and a compressor. The HVAC system also includes a controller that is operable to detect a condition of the vehicle that includes at least one of a position of the door, a location of the vehicle, and a load of the propulsion system. The controller is programmed to adjust the refrigeration circuit in response to the sensed passenger compartment temperature and the detected vehicle condition.

The present invention provides a system & method for controlling a radiator flap for a vehicle, which are capable of effectively operating of a cooling fan and a radiator flap simultaneously consequently by opening & closing the radiator flap by a combination of a cooling fan control signal related to control of the cooling fan and a vehicle CAN signal related to vehicle state information, such as a vehicle speed. The system includes: an engine controller that is configured to generate a cooling fan control signal. In addition, an integrated controller is configured to detect an engine coolant temperature based on the cooling fan control signal, and detect one or more of vehicle speed information, on/off information of an air conditioner switch, and air conditioner refrigerant pressure information based on a vehicle CAN signal to open and close the radiator flap.

A vehicle cooling system may include a cooling circuit for cooling at least one main component of a vehicle. The cooling circuit may include at least one cooler through which cooling air is flowable and at least two fan chambers adjoined to an outlet side of the at least one cooler. The at least two fan chambers may each include a respective fan arranged therein, a respective main outlet and a respective ancillary outlet. The vehicle cooling system may also include at least one waste air channel that may be connected to the respective ancillary outlets of the at least two fan chambers. The vehicle cooling system may further include at least one control device configured to control a cross-section of each of the respective ancillary outlets and to enable operation of the vehicle cooling system in a normal operating state and in at least two emergency operating states.

Technologies are provided for preventing a working fluid leak from pooling and thus diluting any leaked working fluid from air within a condenser and/or evaporator compartment of the CCU. This can include a computer-readable medium that stores executable instructions that, upon execution, prevent a working fluid leak from pooling within a climate-control unit (CCU) of a transport climate control system. This also includes detecting fulfillment of activation threshold conditions in connection with the CCU. Also, this includes activating a fan in at least one of a condenser unit and an evaporator unit included in the CCU to dilute leaked working fluid from air within the CCU. Further, this includes detecting fulfillment of de-activation threshold conditions and de-activation of an activated fan.

Among other things, vehicle cabin pressure systems and vehicle cabin pressure techniques are described for a vehicle. The vehicle includes a cabin configured to seat a plurality of passengers; at least one inlet including at least one inlet fan; at least one occupancy sensor; and at least one processor configured to execute computer executable instructions, the execution carrying out operations including: receiving a signal from the at least one occupancy sensor indicating a number of passengers within the cabin; and controlling the at least one inlet to cause air that is or has been filtered to flow into the cabin and increase a pressure in the cabin to a predetermined level above an ambient pressure level outside the vehicle based on the number of passengers in the cabin.