Abstract: A refrigerant scroll compressor for a motor vehicle air conditioning system having a fixed scroll, an orbiting scroll engaging with the fixed scroll, wherein the fixed scroll and the orbiting scroll cooperate to compress a refrigerant gas. An intermediate pressure chamber is disposed adjacent the orbiting scroll, an oil return duct provides fluid communication between the intermediate pressure chamber and a high pressure area of the refrigerant scroll compressor, and at least one intermediate pressure duct is formed in one of the orbiting scroll and fixed scroll and is in fluid communication with the intermediate pressure chamber.

Abstract: A refrigerant circuit of an air conditioning system for a passenger compartment of a motor vehicle having a primary circuit having a compressor configured to compress a refrigerant, a first heat exchanger in fluid communication with the compressor and configured to transfer heat between a refrigerant and the environment, a first expansion element in fluid communication with the first heat exchanger, and a second heat exchanger in fluid communication with the first expansion element and the compressor, the second heat exchanger configured to dehumidify intake air of the passenger compartment and a secondary circuit having a first flow pathway and a second flow pathway, the first flow pathway having a third heat exchanger in fluid communication with the compressor and configured to transfer heat from the refrigerant to the passenger compartment and a second expansion element in fluid communication with the third heat exchanger, and a third expansion element.

Abstract: A plate type heat exchanger of the present invention includes a heat exchange assembly formed by a plurality of interconnected heat exchange plates in stacked relationship. Each of the heat exchange plates includes longitudinal side webs terminating in seating rims extending toward a longitudinal center axis of the heat exchange plate. The heat exchange plates are disposed between a bottom cover and a top cover of the exchanger. The top cover is provided with couplings at opposite ends for an inlet and an outlet of refrigerant. Each end of the heat exchange assembly, with longitudinal openings of passageways formed between the heat exchange plates, is provided with a manifold having an aperture for a passage of cooled air therethrough.

Abstract: A heat exchanger is disclosed for the exhaust gas train of a motor vehicle. The heat exchanger includes a bundle of separately formed exhaust gas carrying exchanger tubes that is disposed in a closed housing formed separately, a coolant flowing through the housing and around the outside of the exchanger tubes. A bandage is disposed on the bundle of exchanger tubes mechanically connecting a plurality of the exchanger tubes to militate against an oscillation of the exchanger tubes.

Abstract: A method for controlling a heat pump with integration of a coolant circuit as a heat source for heating a motor vehicle at low ambient temperatures including that, in order to increase the suction pressure, the coolant temperature is raised by means of an electrical heating element in the coolant circuit such that, at the refrigerant compressor, a low pressure of greater than or equal to 1.5 bar develops.

Abstract: A dual graphic display unit and a method of assembling such a display unit are provided. The display unit relates to a motor vehicle and includes a display area with two display graphics. The dual graphics may be overlapping and are selectable such that the graphics may be suppressed or displayed to a user of the display unit separately or together. The display unit may include a polarizing filter assembly, a source of polarized illumination for backlighting the assembly to generate the images, and means for activating the source to selectively provide a first polarization to generate the first graphic image and a second polarization to generate the second graphic image.

Abstract: A control device of a multi-functional system for motor vehicles is provided. The control device may include a movable and touch-sensitive control element, an input unit electrically insulated from the control element, the input unit including a set of optical sensors adapted to detect at least one of motion of or touch action on the control element, a display unit adapted to represent information in list form with the information associated with control of the multi-functional system, a computing unit in data connection with the input unit and the display unit, the computing unit adapted to convert positional data associated with the control element or touch action on the control element into a corresponding position in a selection list of the display unit, and an actuatable switching unit coupled to the control element with the switching unit allowing selection of a list element.

Abstract: An air dehumidification unit of a heating, ventilating, and air conditioning system includes an air flow channel configured to guide a flow of air through an evaporator disposed therein, and a drainage channel coupled to the air flow channel. The drainage channel has an internal volume configured to receive a fluid condensed at the evaporator from the flow of air. The air dehumidification unit further includes a heating device configured to heat the internal volume of the drainage channel from outside of the internal volume of the drainage channel to militate against a formation of ice therein. The invention also relates to a method for dehumidifying the air in the heating, ventilating, and air conditioning system of a motor vehicle using the air dehumidification unit.