Abstract: The present invention relates to a pulse valve (10) with a closing body (18) that cooperates with a valve seat (22) and, in a first switching position, establishes a flow connection between a supply channel (12) and a discharge channel (14) and, in a second switching position, blocks the flow connection. The closing body (18) periodically alternates between the two switching positions during the actuation of the pulse valve (10), its movement being hydraulically damped by a throttle point (70). It is provided that the hydraulic damping occurs only in a subrange of motion (62).

Abstract: The invention relates to a device for controlling a ventilation device for a motor vehicle interior (36), comprising at least one air quality sensor (46) for generating an air quality signal of the air supplied to the air quality sensor (46), an actuator for adjusting an air damper (20a, 20b) of the ventilation device as a function of the air quality signal, and a ventilator (14) for transporting the air through the ventilation device into the motor vehicle interior (36). The air quality sensor (46) and the ventilator (14) form a structural unit (44).

Abstract: The present invention relates to a pulse valve (10) with a closing body (18) that cooperates with a valve seat (22) and, in a first switching position, establishes a flow connection between a supply channel (12) and a discharge channel (14) and, in a second switching position, blocks the flow connection. The closing body (18) periodically alternates between the two switching positions during the actuation of the pulse valve (10), its movement being hydraulically damped by a throttle point (70). It is provided that the hydraulic damping occurs only in a subrange of motion (62).

Abstract: A heating and/or air-conditioning system for a motor vehicle includes a heater circuit having a heat exchanger that has heating water flowing through it for bringing climate control air to be supplied to a vehicle interior to the right temperature, a supply line for supplying hot heating water to the heat exchanger, a return line for removing cooled heating water from the heat exchanger and a control valve for regulating the flow quantity of the heating water flowing through the heat exchanger. The supply line and the return line are provided to be thermally coupled at least along a part of their length outside of the heat exchanger.

Abstract: The invention relates to a climate control system for the interior of a motor vehicle, having a blower regulator, heating control unit or brushless blower motor, as well as function components such as operating elements, sensors, clocking valves and adjusting drive mechanisms, which are connected to one another and to the vehicle battery via connecting lines and to which the information required to operate the blower regulator, heating control unit or brushless blower motor are transmitted.

Abstract: A power MOS transistor having a PMT chip located in a transistor housing in which the temperature of the transistor barrier junction is monitored is described. Protection of the PMT chip against overload and permanent damage is guaranteed without negatively affecting its switching function in that a protective circuit is provided in the transistor housing which directly measures the temperature of the transistor barrier junction using a temperature measuring element, and when a predefined or predefinable limit barrier junction temperature is reached reduces the drain current and thus the power loss of the PMT chip, the temperature measuring element being integrated in the PMT chip or accommodated in the transistor housing together with the protective circuit as an additional chip.

Abstract: An electronic control circuit for controlling an electromagnetic valve having an armature, in particular for a heating and/or air-conditioning system in a motor vehicle, has an electronic switching element in series with the coil of the valve and is characterized in that the switching element controls the valve voltage (or the valve current) applied to the coil so that the valve voltage reaches a first value when the valve is switched on; then the valve voltage is reduced to a second value which is lower than the first value; and thereafter the valve voltage assumes a third value which is greater than the second value and represents a holding voltage for holding the armature in its switched-on position.

Abstract: A device for operating an electric motor (10) is proposed, which evaluates overloading or blocking of the drive (11) from a characteristic of a current (40, 41) flowing through the electric motor (10). In accordance with a first embodiment, the determination of the characteristic is provided within a time interval (TI)′ the time interval (T:) occurring within the starting operation after a starting instant (To) of the electric motor (10). In accordance with another embodiment, the determination of the characteristic is provided at a prescribed sampling instant (TA) which occurs at a prescribed delay time (Tv) after a starting instant (To).

Abstract: A method for controlling a motor vehicle air conditioning system is described. The motor vehicle air conditioning system comprises a refrigeration circuit including a refrigerant compressor, a condenser, an evaporator and a throttle device arranged upstream of the evaporator. The condenser is associated with a ventilating fan and the evaporator is associated with a blower. The compressor capacity, the condenser capacity and the evaporator capacity are directly or indirectly sensed by sensor means and supplied as electrical variables to an electronic control circuit which logically combines these input signals and generates output signals in dependence on at least two of these capacity values and including further parameters. The control circuit acts on electrically controllable acturators for influencing the compressor capacity, the condenser capacity and/or the evaporator capacity.

Abstract: Disclosed is a method and apparatus for controlling the output speed of a fluid friction clutch. The fluid friction clutch comprises a work chamber, in which a drive disk rotates, and a reservoir. A valve controls the circulation of a viscous medium between the work chamber and the reservoir. The output rotational speed is thus dependent on the filling ratio of the work chamber. The valve is actuated as a function of at least one control parameter by means of a stepping motor connected with the clutch. The control parameter is preferably the temperature of the cooling medium of an internal combustion engine. The rotational output of the stepping motor is converted to a linear motion to actuate the valve lever by means of a spindle drive.

Abstract: A circuit, safe against an overload, for incrementally varying the power to an electric blower motor used for heating, ventilating and conditioning vehicles, having a PTC resistor in series with other series resistors in the circuit.

Abstract: Disclosed is a fluid circuit, comprising a fluid outlet; a primary fluid flow line having a first section coupled with the fluid inlet and a second section coupled with the fluid outlet; an on-off type control valve and a heat exchanger located in the primary fluid flow line; a bypass fluid flow line connected in parallel to the heat exchanger to provide fluid flow between the first and second sections bypassing the heat exchanger; and a valve positioned in the bypass line for permitting fluid flow in the bypass line in the direction of the fluid inlet. Also disclosed is an automotive vehicle heating and cooling system containing the fluid circuit as the vehicle interior compartment heating system.

Abstract: A device for the temperature regulation of water which is used in motor vehicle heating and air conditioning systems. This device contains a primary and a secondary circuit which is linked by a cruciform connector in a hydraulically switchable manner. The primary circuit includes a cooling circuit heat exchanger and a cooling water pump, with the secondary circuit containing a heater heat exchanger and a water pump driven by an electric motor.