Abstract: Air-diffusion panel for a motor vehicle including at least one air inlet and at least one air duct in communication with the said air inlet and air-distribution means, characterised in that it includes at least one resonant cavity (8) tuned so as at least partially to reduce the airstream noise in the said duct (4, 5, 6).

Abstract: The invention relates to a heating, ventilation and/or air conditioning apparatus that includes a control device and a flap controlled by the control device. The control device includes a control member and a kinematic control linkage of the direct-coupling type arranged between the control member and the flap. The kinematic linkage includes a cable fixed close to its ends and at least one elastic element arranged in such a way as to confer deformability by flexing the kinematic linkage when the flap is at an end stop position. The provided flexibility makes it possible to dispense with the setting-up of the control device and reduces the spring effect in the kinematic linkage.

Abstract: In a device for air conditioning a motor-vehicle passenger compartment, a control module adjusts electrical power supplied to a motor-driven fan unit delivering airflow to a condenser of the device. Means are furthermore provided for recording an air throughput passing over the condenser and produced, at least in part, by the motor-driven fan unit. A regulation module estimates a maximum value of the electrical power supply to the motor-driven fan unit, for a given air throughput, with a view to limiting the electrical power supply to this maximum value, as a function of the air throughput.

Abstract: A heating and/or air-conditioning installation with a motor-driven fan unit has a motor driving a turbine, a speed control module and a volute housing the motor and forming an outlet channel for airflow at the periphery of the turbine. The speed control module is mounted at the periphery of the motor and has an electrical connector engaging a connector of the motor. It also has one or more walls of thermally conducting material and in contact with the outlet channel to cool the module.

Abstract: A heating and/or air conditioning device for a motor-vehicle passenger compartment has an air-inlet chamber and a blower for installation in a rear part of the vehicle, a treatment and distribution device for installation in a front part of the passenger compartment), and a connecting duct for connecting the blower to the treatment and distribution device.

Abstract: A heating and/or air conditioning device for a vehicle passenger compartment comprising an air mixing chamber adapted to be supplied with treated air by communicating with a defrost outlet, a ventilating outlet and an outlet for the feet. The defrost outlet and the ventilating outlet are adjacent and defined by a common duct, and said outlets are controlled by two throttle valve-type flaps housed in the common duct and comprising each at least a first couple of wings controlling the defrost outlet and at least a second couple of wings controlling the ventilating outlet, the two flaps being mounted pivoting about parallel axes between an aerating position and a defrosting position.

Abstract: The invention relates to a device for the distribution of ventilating air in the passenger compartment of a motor vehicle. This device has, downstream of a ventilating flap mounted in rotation about a transverse axis in a distribution compartment, a central ventilating duct and two lateral ventilating ducts which deliver air to lateral ventilating outlets. An additional passage connects the chamber (10) upstream of the ventilating flap (8) to the lateral ventilating outlets in the operating modes not involving ventilation, in order to deliver ventilating air to these lateral outlets in these operating modes so as to improve the comfort of the passengers. This passage may be formed by a vent, or by inlet cross sections larger than the area of the flap in front of the lateral ducts.

Abstract: An electric motor, in particular for motor vehicles, supports a control circuit board (7) with electronic components and including a heatsink (12) for evacuating heat radiated by some of the electronic components. The heatsink (12) is attached to a collar (11) immobilized relative to the motor (2) and surrounding the board (7) and has a housing (13) to receive at least some of said electronic components radiating heat in order to connect them to the control circuit.

Abstract: A heat exchanger, particularly an evaporator, has a number of ducts (19) for the flow of a cooling fluid which are connected in series, each duct (19) being produced as a pair of plates (13) including a concave region (3) limited by an edge (5) and provided with a number of studs forming dimples (9), the dimples being randomly distributed. The invention applies mainly to the air conditioning of motor vehicles.

Abstract: A refrigerant fluid circuit for a motor vehicle includes an air conditioning loop and a heating loop, the heating loop comprising a heating branch. A variable opening valve is connected in the heating loop. This valve is controllable so as not only to control the distribution of the refrigerant fluid flowing in the circuit into the heating loop, but also to control the expansion of the fluid in its gaseous state in the heating loop in the additional heating mode.

Abstract: A heating and/or air-conditioning device for a motor vehicle comprises a casing (12) housing a motor-driven fan unit (16) suitable for impelling a flow of air and a removable air filter (28) suitable for filtering the impelled airflow. The casing (12) is arranged in the passenger compartment (H) of the vehicle along the bulkhead (14) separating the engine compartment (CM) from the passenger compartment (H), and provision is made for the bulkhead and the casing to include respective access apertures (32, 30) arranged facing one another in order to allow the filter (28) to be withdrawn out of the casing through the engine compartment, exchanged if appropriate and re-inserted into the casing.

Abstract: An air flow control register includes a frame carrying pivotable vanes, which are rotated on parallel axes by a common drive mechanism, so that the setting of the vanes is variable between a maximum flow position, in which the flaps have a minimum inclination with respect to the direction of air flow through the register, and a no-flow position in which this inclination is a maximum. The drive mechanism controls the pivoting of the vanes in such a way that they all rotate by the same amount, with alternate vanes rotating in opposite directions.

Abstract: A motor-vehicle heating and/or air conditioning device has a cold-air duct, a hot-air duct housing a heating radiator, a mixing chamber communicating with respective air outlets of the ducts and a mixing means. The mixing means has at least one flap of drum type which, in the “hot” position, closes off the outlet of the cold-air duct, and, in the “cold” position, closes off the outlet of the hot-air duct. The shutter wall of the flap includes at least one recess such that, when the flap is shifted from the “hot” position to the “cold” position, a cold airflow can pass through the recess so as to encounter a hot airflow.

Abstract: The invention concerns a refrigerating fluid circuit capable of operating in three fluid circulation modes, namely an air conditioning mode whereby the fluid circulates successively in the evaporator where it is evaporated by receiving the heat of the air flow to be treated, in the compressor, in the condenser where it is condensed by yielding the heat to another medium and in a pressure reducing valve; a supplementary heating mode whereby the fluid circulates in gaseous state between the evaporator where it yields heat to the air flow and the compressor, without passing through the condenser, and an inoperative mode whereby the fluid does not circulate in the evaporator. The invention is characterized in that the circulation mode is determined taking into account not only the user's choice but also the possible presence of mist on the windscreen, detected by a sensor, so as to promote demisting while optimizing comfort and energy conservation.

Abstract: The invention concerns an air conduit for motor vehicle instrument panel made in the form of an open conduit with a longitudinal slot defined by two fusion faces, the open conduit being produced in one single piece with the instrument panel by moulding a ductile material enabling the stripping by widening the longitudinal slot, means for joint being provided by joining the fusion faces of the longitudinal slop after stripping.

Abstract: In a motor vehicle heating or air conditioning device, a pollution sensor for detecting a pollutant, particularly carbon monoxide, in an airflow sent into the passenger compartment of the motor vehicle is arranged downstream of an air filter. The pollution sensor detects the presence of pollutant in the filtered airflow and supplies pollution measurements of the filtered airflow. The sensor is linked to a control circuit acting on an air intake flap to supply the passenger compartment with a mixture of external air from outside the passenger compartment and/or recirculated air from the passenger compartment, depending on the pollution measurement results.

Abstract: In a heating and air conditioning installation for a motor vehicle, the refrigerant fluid circuit includes a cooling (air conditioning) loop including a condenser, and a heating loop. In order to detect excess pressure in the refrigerant fluid in the condenser, during corrective discharges of the fluid to the condenser from the heating loop, the frequency of occurrence of these discharges is monitored continuously, and an evaluation is made as to whether the measured frequency exceeds a threshold value. The outlet pressure of the compressor is also monitored continuously, an evaluation being made as to whether the measured pressure exceeds a predetermined demand pressure by an excess value over a given period of time.

Abstract: A motor-vehicle heating and/or air-conditioning device has an air intake chamber (12) with an inlet (14) for outside air (AE), an inlet (16) for recirculated air (AR) and a flap (18) for selectively controlling the inlets. A motor-driven fan unit (28) downstream of the air intake chamber has a casing (30) accommodating a centrifugal turbine (34) driven by a motor (48). The fan unit takes in air flow axially then delivers it tangentially. The. combination formed by the outside-air inlet (14) and the recirculated-air inlet (16) extends on either side of an arbitrary plane (P) passing through the axis of rotation (50) of the motor (48), the latter being located on the same side as the air inlets (12) and (14), which makes it possible to reduce the axial space taken up.

Abstract: An air conditioning installation is supplied with an activated carbon filter for cleaning the air to be supplied to the interior of a motor vehicle. A device is provided for cleaning the air filter and the air therein by heating, and air laden with by-products may be driven out of the filter by means of a cleaning airflow. The activated carbon is in physical contact with a temperatureregulated or temperature controlled heating device, with which the activated carbon and the air present in the filter can be heated, while the cleaning airflow flows through the filter.

Abstract: An air distribution device comprises a casing (10) provided with a cylindrical wall (12) having at least one air passage opening (14, 16), a shutter (20) mounted so as to pivot with respect to an axis of rotation (X—X) and having a generally cylindrical obturation wall, which is mounted so as to movable with respect to a body of the shutter, consisting of two plates, in a direction substantially radial with respect to the axis of rotation (X—X) of the shutter by virtue of movement means (46, 48) synchronised with the rotation of the shutter, which makes it possible to move the obturation wall (24) away from the wall (12) when the shutter is in an open position (P1, P2) and bring the obturation wall (24) closer to the wall (12) of the casing when the shutter is in a closed position.