Abstract: A flap valve for a heating and/or air conditioning installation for a motor vehicle has a valve flap which is operated by a control device between an open position and a closed position. The control device comprises a driving lever which is coupled, through a link, to a driven lever fixed to the valve flap. The driving lever is rotated about its axis between an open position and a closed position of the driving lever, during which it passes through an intermediate position near to the closed position. The valve flap is closed when the driving lever reaches its intermediate position, so that the travel of the latter between its intermediate and closed positions is dead travel during which the valve is in the closed position of the valve and the link is in compression so as to change its effective length.

Abstract: A heating and/or air conditioning installation for a motor vehicle includes a wall having a through hole. A temperature sensor has a heat sensitive element lying in a housing, which may for example be formed in an evaporator of the air conditioning installation. The sensor has protruding connecting wires surrounded by a sheath, and is attached through the hole in the wall by a fastening device. The fastening device comprises a tubular body portion adapted to be removably held fast in the hole, together with a sleeve portion joined to the inside of the body portion and having a passage through which the sheath passes. The sleeve portion has a narrow end which grips the sheath, and a wide end facing towards the heat sensitive element and affording some freedom of lateral movement to the connecting wires.

Abstract: A heat exchanger, in particular a heat exchanger for a motor vehicle, has a plurality of tubes, each of which comprises a press-formed metal blank rolled on itself to form a casing defining two parallel ducts for flow of a fluid in counterflow mode between them. The ducts are separated by a longitudinal bulkhead, and the tube has a first end portion and a second end portion. The first end portion is arranged for connection to a header having two compartments. The second end of each individual tube is closed so as to obturate the two ducts, and at least two communication apertures are formed in the bulkhead in the vicinity of the second end.

Abstract: A heating, ventilating and/or air conditioning apparatus includes an air heating duct containing a primary radiator of the hot fluid flow type and an electric auxiliary radiator, a stream of air being passed through both radiators. It also includes a signal processing module for governing operation of the apparatus in accordance with atmospheric parameters set by a user, and a temperature sensor for measuring the temperature of the fluid flowing in the primary radiator. The signal processing means include a regulating module which is arranged to make a selective decision as whether to energise the auxiliary radiator, and if so, to what extent, in accordance with the parameters set by the user and at least the measured temperature of the fluid in the primary radiator.

Abstract: A heat pump installation, especially an air conditioning installation for a motor vehicle, includes a unit consisting of a refrigerant fluid reservoir which comprises a vessel closed by a cover which carries an expansion device. The expansion device is connected firstly to an inlet chamber formed in the reservoir and containing a dehumidifying filter, and secondly to an outlet chamber formed in the reservoir and separated from the inlet chamber by a separating member. The separating member is trapped between the cover and the vessel.

Abstract: An air conditioning circuit of a motor vehicle is used for heating the cabin of the vehicle. The air conditioning circuit accordingly operates in a cooling mode and a heating mode, selectively. In the heating mode, the refrigerant fluid flowing in the air conditioning circuit flows in a branch of the circuit which bypasses the condenser. The evaporator therefore receives this fluid in the gaseous state and acts as a heat exchanger for dissipating the heat produced in the compressor. The heat dissipated by the evaporator can be used for heating the cabin when that produced by the engine of the vehicle is insufficient for this purpose. To this end, an ejector draws a complementary mass of fluid into the heating loop for the purpose of adjusting the heat energy produced.

Abstract: A motor vehicle heating and ventilating, and/or air conditioning, installation includes a heating and air distribution unit comprising a casing, the inlet of which is connected to the delivery side of a motorised fan unit. The casing has two outlets, namely a "feet" outlet leading to a lower part of the cabin of the vehicle, and a ventilation outlet, also leading into the cabin. The casing is divided into three ducts. Each of the first and second ducts has an upstream end open at the inlet of the casing, and a downstream end communicating with the feet and ventilation outlets of the casing respectively, under the control of a first flap valve and a second flap valve respectively. The third duct lies between the first and second ducts and has a central portion containing a heat exchanger.

Abstract: In a heating mode, the fluid in the air conditioning circuit flows in a bypass branch avoiding the condenser. The evaporator then receives the fluid in the gaseous state and acts as a heat exchanger for dissipating the heat produced in the compressor. The heat dissipated by the evaporator may be employed to heat the cabin when that produced by the drive motor of the vehicle is insufficient. In addition, special configurations of the circuit enable the mass of fluid flowing in the heating loop to be increased or reduced with a view to regulating the calorific power produced.

Abstract: The invention concerns a device for the heating and air-conditioning of the passenger compartment of a motor vehicle with an electric motor.

Abstract: A motor vehicle air conditioning system includes an adjustable position air inlet valve for controlling the relative proportions of recirculated air and fresh air from outside entering the system. A first sensor and a second sensor give respective measurement signals representing the inside temperature of the cabin and the outside temperature. The occupant of the vehicle can set a required value of inside temperature on a data unit, which memorizing this setting. The installation includes a processor for computing the difference between the actual inside temperature and its required value, and for memorizing at least one first temperature threshold value. The processor makes a first comparison between this first threshold value and the computed absolute value of the temperature difference, and then performs a second comparison between the inside and outside temperatures.

Abstract: A temperature control device for an electric motor vehicle passenger compartment, wherein a fluid coolant flows through an inner heat exchanger arranged in the path of an air flow to the passenger compartment, a first outer heat exchanger arranged in the path of an air flow out of the passenger compartment, and a second outer heat exchanger ?(42)! for exchanging heat with a heat source outside the passenger compartment. Said device may operate in heating mode or in cooling mode depending on the direction of flow of the fluid coolant. The device is useful in motor vehicles.

Abstract: The components of a heating-ventilation and/or air conditioning apparatus, which are disposed on the side of the passenger space in relation to a transverse partition separating this passenger space from the engine compartment, are disposed one after the other in a substantially horizontal direction along the longitudinal axis of the vehicle and are mounted centrally in the dashboard.The components of the apparatus may thus be grouped in a central module of the dashboard and are particularly suitable for motor vehicles of the "single box" type.

Abstract: A heat exchanger comprises a fluid inlet tube member and a fluid outlet tube member on parallel axes, and third and fourth tube members to be coupled end-to-end to the inlet and outlet tube members, for connection of the latter to external flexible tubes; and has a rapid coupling device which comprises two sleeves, constituting end portions of the third and fourth tube members, for embracing the fluid inlet and outlet tube members, which are provided with seals. A locking arm which is pivoted on one of the sleeves terminates a saddle which, in a locking position, extends through an aperture in the other sleeve so as to be engaged on the outlet tube member and to hold the latter in sealed contact with the second sleeve. The arm at the same time maintains the first sleeve in sealing contact with the inlet tube member, which is fixed with respect to the outlet tube member.

Abstract: An electric vehicle has a radiator for cooling the traction motor of the vehicle, arranged in an air circuit which also contains a blower for circulating air in the circuit, and air flow regulating valves. The apparatus disclosed includes an air conditioning apparatus which comprises an evaporator and an auxiliary electric heating radiator, both of which are controlled jointly by a control member movable along a linear path to regulate the cooling or heating of the cabin as necessary, at the same time as the cooling of the motor.