Abstract: The invention relates to a system for controlling the speed of a motor (1) of an electric fan unit comprising a field-effect transistor (3) that controls the motor (1) using pulse-width modulation, the field-effect transistor (3) being connected to a circuit (5) comprising a voltage source (7) and a resistive element (9) in series, the circuit (5) is connected between the gate (G) of the field-effect transistor (3) and a second source (S2) that is connected to a first source (S1) of the field-effect transistor (3), via an inductor (11) in order to allow a reduction in the slope of the current as the field-effect transistor (3) switches.

Abstract: The present invention relates to a control panel, in particular for a motor vehicle, provided with at least one rotary button (10) for adjusting a parameter relating to an air stream propelled by a ventilating, heating and/or air conditioning apparatus, characterised in that the said adjusting button (10) is an optical encoder with selective light emission and reception, and comprising a rotatable part (20) protruding from the control panel, and a fixed part (30) co-operating with the moving part (20) for emitting and receiving the light. This control panel is adapted to adjust, for example, the temperature, flow rate or distribution of the said air stream.

Abstract: The apparatus of this invention comprises a casing (10) having an upstream chamber (12) which feeds with cold air an auxiliary duct (40) that supplies at least one first duct (52, 54), which feeds a rear zone (ZAr) of the cabin; a first mixing chamber (20) which supplies processed air to second ducts (30, 32, 34) that feed a front zone (ZAv) of the cabin; and a heating chamber (16) which supplies heated air to the mixing chamber (20) and the first duct or ducts. The device further comprises a second mixing chamber (50) and a single distribution shutter valve (56), having a first control member (60) which is arranged to distribute part of the heated air coming from the heating chamber (16) selectively, either to the first mixing chamber (20) or to the second mixing chamber (50); and a second control member (62) arranged to control distribution of the mixed air from the second mixing chamber through the first duct or ducts (52, 54). Applicable to motor vehicles.

Abstract: The invention concerns a device for the coaxial connection of a first manifold (12) comprising a protrusion (18) able to be received in a neck (22) on a second manifold (14). The device is produced in the form of an open collar (10) produced from an elastically deformable material and having a bottom (36) extended by two arms (38) having respective ends which define the opening of the collar. The collar is provided with retaining stops (44, 46, 48) and at least one locking member (60) arranged so as to cooperate with an engagement region (34) of at least one of the manifolds in order to prevent any accidental extraction of the open collar once fitted. Application in particular to heat exchangers for motor vehicles.

Abstract: The invention relates to a keypad (10) for a control panel, in particular for a motor vehicle instrument system, comprising a front (30) provided with openings (32) through which a number of push-buttons (20) are placed, each positioned facing a contactor (14) fixed to a card (12), characterized in that the buttons (20) are linked together at least in groups of two to form a unitary set (22) and are placed with respect to one another on the keypad (10) such that each button (20) can be moved individually and pushing thereof causes solely actuation of the contactor (14) assigned to said button, without any effect on the contactors of the other buttons.

Abstract: In an installation for heating/air conditioning the cabin of a motor vehicle, comprising a powered fan unit (18) delivering a flow of air in an air distribution conduit (12) in which at least one evaporator (22) is disposed, an electrostatic filtration system (30) is provided, comprising an ionising part and a collecting part, placed upstream of a plasma catalysis system (40) comprising a plasma generating part.

Abstract: The device (10) of the invention comprises a shaped box having a bottom wall (12) connected to a peripheral wall (14) in order to delimit a housing (20) for receiving the enclosure (22) of an electric motor (24) driving a turbine (32), the latter being received in a volute (26). The bottom wall (12) has in it at least two holes (48) at a distance from the rotation axis (XX) defined by the motor shaft so as to allow the passage of a flow of cooling air (F) which passes through the enclosure (22) of the motor and rejoins the volute (36). Application in particular to automobile heating, ventilation and/or air-conditioning apparatus.

Abstract: The invention proposes a pressure-reducing device designed to be installed in an air conditioning circuit operating with cooling fluid (FR) and including a housing suited to be traversed by cooling fluid under the control of a needle valve (134). The pressure-reducing device moreover includes a bulb (200) filled with a control fluid (FC) exerting a control pressure on a membrane (33) as a function of ambient conditions, the aforementioned membrane being suitable for acting on the needle valve as a function of the control pressure. The bulb is placed in the path of cooling fluid between the outlet of the condenser and the inlet of the pressure-reducing device.

Abstract: Part for supporting an item of equipment, comprising support ribs, and method of molding said part The support part has support ribs for holding an item of equipment, in particular an electric motor for a motor vehicle. A mold consisting of at least two cores is provided. These cores are brought toward one another in a direction (D) such that they are in contact with one another along a parting plane. The mold is filled with a moldable material and the cores are moved apart from one another in the given direction (D). The support ribs are provided on the molded part with an angle of inclination with respect to the given direction (D). The ribs follow the parting plane. A clearance is provided in the region of the parting plane between the cores in order to form the ribs during molding.

Abstract: Heat exchanger with thermal inertia for a heat transfer fluid circuit, particularly of a motor vehicle The invention relates to a heat exchanger for a heat transfer fluid circuit comprising ducts for the circulation of the heat transfer fluid, which are inserted between an inlet and an outlet, and cavities which are designed to contain a heat storage fluid are situated adjacent to the cooling fluid circulation ducts and are also associated with heat-exchange surfaces able to be swept by a flow of air to be conditioned, so that the heat storage fluid is capable of exchanging heat with the air flow, if the circulation of the heat transfer fluid is stopped. Application in particular to the air-conditioning evaporators of motor vehicles.

Abstract: The invention proposes an air conditioning system for motor vehicles which is fitted with an injection computer and an electronic control device. The system comprises a first measuring member suitable for supplying a value relating to the pressure of the fluid at a first point in the air conditioning circuit which is situated between the outlet of the expansion member and the outlet of the evaporator, and a second measuring member suitable for supplying a value relating to the pressure of the fluid at a second point in the air conditioning circuit which is situated at the inlet to the compressor. The electronic control device makes use of the solution of an equation which relates the mass flow rate of the refrigerant fluid to the difference in pressure between the first point and the second point in order to calculate an estimate of a magnitude relating to the refrigerant fluid.

Abstract: A motor-vehicle heating and/or air conditioning device has a cold-air duct (12), a hot-air duct (14) housing a heating radiator (18), a mixing chamber (28) communicating with respective air outlets (24, 26) of the ducts, and mixing means which comprise at least one flap (30) configured in such a way that, when the flap passes from a “hot” position to a “cold” position, the shutter wall (34) of the flap first of all clears a region of the outlet (24) of the cold-air duct which is close to the outlet (26) of the hot-air duct, so as to promote the mixing of a cold airflow (F1) and of a hot airflow (F2).