Abstract: In a heating-medium heating unit equipped with a first heating-medium circulation box and a second heating-medium circulation box which are in close contact with both surfaces of a PTC heater, in which heating-medium circulation passages are formed in the interior, and which are joined to each other in a liquidtight manner, wherein joining surfaces are sealed with liquid gaskets, the heating-medium circulation passages are provided with joining-surface cooling channels that cool the joining surface which is sealed with a liquid gasket and on which the heat from the PTC heater acts. The joining-surface cooling channels are provided at positions closer to the joining surface than to the PTC heater.

Abstract: A heater control device includes a current calculating unit (20) which calculates a third value of current based on a first value of current flowing through a first PTC element of a first PTC heater which is in an energized state and a second value of current estimated to flow through a second PTC element of a second PTC heater which is to be newly put into an energized state next, and a switching control unit (21) which maintains a non-energized state of the second PTC element of the second PTC heater until it is determined that the third value of current calculated by the current calculating unit (20) is less than a predetermined maximum allowable value of current and puts the second PTC element of the second PTC heater into an energized state when the third value of current is less than the predetermined maximum allowable value of current.

Abstract: The heat medium heating device is provided with the following: a plurality of flat heat exchange tubes in which U-turn flow channels are formed; a heat medium inlet and outlet header to which heat medium inlet and outlet pipes are connected, and to which one end of each of the flat heat exchange tubes is connected at predetermined intervals and is jointed by brazing; and a plurality of sets of PTC heaters stacked between the flat heat exchange tubes. A heat exchange element comprising the flat heat exchange tubes, the heat medium inlet and outlet header, and the PTC heaters is sandwiched between a holding plate or a bottom face of a housing and a substrate mount, and is accommodated and installed within the housing in a state where the flat heat exchange tubes and the PTC heaters are in close contact.

Abstract: A heater control device having at least two PTC heaters having PTC elements includes switching units which are provided so as to correspond to the PTC heaters and which switch an energized state and a non-energized state of the PTC elements by being turned ON and OFF, pattern information which defines state combination patterns of the energized state and the non-energized state of the PTC elements with respect to a required power value for the heater unit, and a ratio controlling unit which when the required power for the heater unit is at an intermediate value of the required power values defined in the pattern information, controls a ratio of the energized state to the non-energized state of the PTC elements based on a ratio of ON time to OFF time for which an average power within a certain period matches the required power.

Abstract: In a heating-medium heating unit equipped with a first heating-medium circulation box and a second heating-medium circulation box which are in close contact with both surfaces of a PTC heater, in which heating-medium circulation passages are formed in the interior, and which are joined to each other in a liquidtight manner, wherein joining surfaces are sealed with liquid gaskets, the heating-medium circulation passages are provided with joining-surface cooling channels that cool the joining surface which is sealed with a liquid gasket and on which the heat from the PTC heater acts. The joining-surface cooling channels are provided at positions closer to the joining surface than to the PTC heater.

Abstract: Provided is a heat-transfer-medium heating apparatus including: a first heat-transfer-medium circulating box and a second heat-transfer-medium circulating box, which are attached to each other in a fluid-tight manner, in which heat-transfer-medium circulating paths are formed therein in close contact with both surfaces of a PTC heater; an electrical-component cooling wall member that is provided in, for example, the first heat-transfer-medium circulating box so as to be located adjacent to the heat-transfer-medium circulating path; and an electrical component that is fixed on the electrical-component cooling wall member, wherein a protruding portion is formed on the surface at the heat-transfer-medium circulating path side of the electrical-component cooling wall member so as to be positioned at exactly behind an installation position of the electrical component and to extend towards the heat-transfer-medium circulating path.

Abstract: A heater control device having at least two PTC heaters having PTC elements includes switching units which are provided so as to correspond to the PTC heaters and which switch an energized state and a non-energized state of the PTC elements by being turned ON and OFF, pattern information which defines state combination patterns of the energized state and the non-energized state of the PTC elements with respect to a required power value for the heater unit, and a ratio controlling unit which when the required power for the heater unit is at an intermediate value of the required power values defined in the pattern information, controls a ratio of the energized state to the non-energized state of the PTC elements based on a ratio of ON time to OFF time for which an average power within a certain period matches the required power.

Abstract: A heater control device includes a current calculating unit (20) which calculates a third value of current based on a first value of current flowing through a first PTC element of a first PTC heater which is in an energized state and a second value of current estimated to flow through a second PTC element of a second PTC heater which is to be newly put into an energized state next, and a switching control unit (21) which maintains a non-energized state of the second PTC element of the second PTC heater until it is determined that the third value of current calculated by the current calculating unit (20) is less than a predetermined maximum allowable value of current and puts the second PTC element of the second PTC heater into an energized state when the third value of current is less than the predetermined maximum allowable value of current.

Abstract: In a vehicle air conditioner (1) employing an air-mix method, airflow which passed through a bypass channel (14) and airflow which passed through a heated air channel (13) are mixed in an air-mix area (15) located downstream of an air-mix damper (6) and the airflow is guided to a foot outlet (19) through a foot channel (18) provided on the back side of a partition wall (2A) constituting the heated air channel (13). The vehicle air conditioner includes a mixing enhancement portion (50) that makes airflow flowing along the partition wall (2A) flow toward the air-mix area (15) and an introduction portion (60) that is continuous with the mixing enhancement portion (50) and smoothly guides the airflow after air mixing to the foot channel (18) are provided at an end (30) of the partition wall (2A) constituting an outlet of the heated air channel (13).

Abstract: Provided is a heat-transfer-medium heating apparatus including: a first heat-transfer-medium circulating box and a second heat-transfer-medium circulating box, which are attached to each other in a fluid-tight manner, in which heat-transfer-medium circulating paths are formed therein in close contact with both surfaces of a PTC heater; an electrical-component cooling wall member that is provided in, for example, the first heat-transfer-medium circulating box so as to be located adjacent to the heat-transfer-medium circulating path; and an electrical component that is fixed on the electrical-component cooling wall member, wherein a protruding portion is formed on the surface at the heat-transfer-medium circulating path side of the electrical-component cooling wall member so as to be positioned at exactly behind an installation position of the electrical component and to extend towards the heat-transfer-medium circulating path.

Abstract: In a heating-medium heating unit equipped with a first heating-medium circulation box and a second heating-medium circulation box which are in close contact with both surfaces of a PTC heater, in which heating-medium circulation passages are formed in the interior, and which are joined to each other in a liquidtight manner, wherein joining surfaces are sealed with liquid gaskets, the heating-medium circulation passages are provided with joining-surface cooling channels that cool the joining surface which is sealed with a liquid gasket and on which the heat from the PTC heater acts. The joining-surface cooling channels are provided at positions closer to the joining surface than to the PTC heater.

Abstract: A vehicle air conditioner that can increase the range of energy-saving operation by stopping an engine without impairing the air conditioning comfort and a method for controlling the vehicle air conditioner are provided.

Abstract: Provided is a vehicle air conditioner capable of maintaining comfortable temperature-controlling properties by improving the air mixing performance while reducing separation in the air channel to increase the air flow rate and reduce noise.

Abstract: An air-conditioning unit and an air-conditioning apparatus capable of setting the air temperature at a defroster vents higher than the air temperature at the foot vents during heating operation are provided. Each of the air-conditioning unit and air-conditioning apparatus includes a chassis; a cooling unit configured to cool air introduced into the chassis; a heating unit configured to heat air introduced into the chassis; a conditioned-air channel configured to guide the heated air and the cooled air into a high-temperature hot-air vent and a low-temperature hot-air vent; and a mixing-suppression unit configured to suppress mixing of the heated air and the cooled air, the mixing-suppression unit being provided in the conditioned-air channel.

Abstract: The invention provides an air mixing damper apparatus and an air conditioning apparatus for vehicles where the temperature of discharged air can be changed linearly with respect to the operation of an actuator lever. A rotation speed adjustment mechanism is disposed between a plate door type air mixing damper 43A for opening and closing an air introducing face 42a of a heater core 42, and a rotation type lever 48 for an actuator 47 driving the air mixing damper 43A, for adjusting the rotation speed at an initial opening stage X and a final opening stage Z of the air mixing damper 43A, to a speed lower than at an intermediate opening stage Y.

Abstract: A damper attaching structure which enables a damper provided with a thin rotational shaft to be assembled inside a casing or the like by employing an opening formed in the casing, is obtained by providing a concave groove which is formed in the inner surface of wall member and which is continuous from a casing opening; a positioning plate provided at the base of a damper thin shaft on the damper side thereof; a shaft hole which opens at the concave groove and which is larger than the cross section of the damper thin shaft; and a shaft fixing member which is provided on a lever, and which has an engaging hole into which the damper thin shaft is inserted and which engages the damper thin shaft member to enable torque transmission, and rotatably inserted into the shaft hole.