Abstract: The invention relates to a method for operating a circuit having a heat accumulator, having a coolant circuit, having a heat accumulator in a line of the circuit and having at least one valve and one pump, wherein, when the valve is open, the heat accumulator can be charged with coolant from the coolant circuit by means of the pump, or coolant can be discharged from the heat accumulator into the coolant circuit, wherein the charging or discharging of the heat accumulator takes place in an open-loop-controlled or closed-loop-controlled manner as a function of a temperature difference of a temperature of the coolant in the circuit and a temperature of the coolant in the heat accumulator.

Abstract: The invention relates to an air conditioning unit (1), in particular for a stand-alone operation in a motor vehicle, comprising a compressor, condenser (3) and evaporator (2) that are situated in a coolant circuit, for cooling the air to be conditioned. According to the invention, the unit is equipped with a single fan (5) for the air that dissipates the heat and for the cooled air that is to be fed to the interior of the vehicle, said fan transporting part of the air through the condenser (3) and the other part through the evaporator (2).

Abstract: The invention relates to a method for regulating a coolant circuit (2) of a vehicle air conditioning system (4). According to said method, a target value (SW(VT)) for an evaporator temperature (VT) is predetermined in a base control circuit. Said value is used to determine a control value (U) for controlling the evaporator temperature (VT) by means of an evaporator temperature regulator (16). Said control value is also fed to a ventilator fan controller (26).

Abstract: The invention relates to a heating, ventilating or air-conditioning system, particularly for motor vehicles, and to a method for operating a system of this type, particularly for controlling the outflow characteristics (18) of a vent (1).

Abstract: The invention relates to a method for regulating an air nozzle (3) for air-conditioning a motor vehicle. An actuator which is used to control a ventilation device and/or an actuator which is used to control the width of the air jet and/or an actuator which is used to control the direction of air and/or a heating device are associated with said air nozzle (3). At least one sensor, which is used to receive measuring values, is provided. The adjustment of the air nozzle (3) is regulated according to measuring values of the sensor.

Abstract: The invention relates to an air-conditioning system (1), in particular a motor vehicle air-conditioning system (1) comprising a coolant circuit (2) provided with a coolant compressor (3) and a gas cooler (4), an internal heat exchanger (5), an expansion unit (7) and an evaporator (8) Said invention is characterised in that a device for turning back the coolant flow direction is provided for the heal pump operation and means for switching off the internal heat exchanger (5) when the flow direction is reversed is also provided.

Abstract: The invention relates to a method for controlling a coolant circuit (2) of an air conditioning system (4) for a vehicle. According to said method, a compressor (10) that is located in the coolant circuit (2) is controlled in accordance with an evaporator temperature controller (VR) and a load torque limitation function (22) that is integrated into said evaporator temperature controller (VR).

Abstract: The invention relates to a method for regulating a coolant circuit (2) of a vehicle air conditioning system (4). According to said method, a target value (SW(VT)) for an evaporator temperature (VT) is predetermined in a base control circuit. Said value is used to determine a control value (U) for controlling the evaporator temperature (VT) by means of an evaporator temperature regulator (16). Said control value is also fed to a ventilator fan controller (26).

Abstract: The invention relates to a method and system for controlling a compressor in a refrigerant circuit of an air-conditioning system of a motor vehicle. The instantaneous load torque is determined and compared with a maximum limiting torque prescribed by an engine controller, and the compressor is controlled depending on the comparison value resulting therefrom. In order to avoid complete shutdown of the compressor, the instantaneous load torque is represented as a function of variables, such as compressor speed and high pressure of the refrigerant, and, using an inverted function belonging to this function, a control signal for the compressor, for example, a set-point value for the high pressure of the refrigerant, is determined as a function of the maximum limiting torque and employed to control the compressor.

Abstract: The invention relates to a method and system for controlling a compressor in a refrigerant circuit of an air-conditioning system of a motor vehicle. The instantaneous load torque is determined and compared with a maximum limiting torque prescribed by an engine controller, and the compressor is controlled depending on the comparison value resulting therefrom. In order to avoid complete shutdown of the compressor, the instantaneous load torque is represented as a function of variables, such as compressor speed and high pressure of the refrigerant, and, using an inverted function belonging to this function, a control signal for the compressor, for example, a set-point value for the high pressure of the refrigerant, is determined as a function of the maximum limiting torque and employed to control the compressor.

Abstract: The invention relates to a sensor for detecting the direction and intensity of solar insolation, particularly, for controlling an air conditioning system, having at least two sensor elements that, are assigned to the left-hand and right-hand sides of the vehicle, respectively, and are arranged on a respective face whose surfaces are, at least partially, subject to the solar insolation entering the vehicle from the left-hand and right-hand sides, respectively. To provide an improved sensor that is particularly cost effective and can be fitted simply into a vehicle to control an air conditioning system, the sensor elements are designed as temperature sensors and are each connected in a heat conducting manner to their associated surfaces, which surfaces absorb, at least, most of the solar insolation which is incident thereon.

Abstract: A process and an arrangement for controlling an air conditioner utilize an evaporator protected against icing and a refrigerant circulating system which includes at least one compressor and the evaporator. The evaporator temperature is sensed continuously and the compressor is deactivated when the evaporator temperature falls below a defined switch-off temperature. The compressor is activated again when the evaporator temperature exceeds a defined switch-on temperature which is at least equal to the switch-off temperature. The evaporator temperature gradient is determined by a corresponding control unit from the continuous sensing of the evaporator temperature.

Abstract: A rotary fluid-control valve for controlling fluid flow has a cylindrical valve chamber, a dove-tail shaped valve body mounted rotatably in the valve chamber and movable between an open position and a closed position, and four fluid passages extending from the valve chamber. The passages are arranged essentially parallel with respect to one another and the valve body is pivotally connected to the valve chamber with a pivot pin extending in the axial direction of the valve chamber. The passages extend perpendicular to the pivot pin. The valve chamber has a convex section that, when the valve body is rotated out of the closed position, causes an asymptotic rise in the throughflow quantity. A stop or pressure equalizing projection projects into the valve chamber and is dimensioned so that a pressure drop in the closed position of the valve body corresponds to a pressure drop of the radiator in the open position of the valve body.

Abstract: A device and method for controlling air conduction in a vehicle includes an air conduction element. The air conduction element is controlled as a function of the moisture in the vehicle interior, intermediate positions of the air conduction element being possible between a maximum proportion of circulating air and a maximum proportion of fresh air. In this way, the proportion of fresh air is increased only gradually when there is a high pollution impact if the interior moisture does not exceed a maximum moisture value .PHI..sub.max. Control of the moisture in the vehicle interior increases the comfort of the vehicle occupants. A circulating-air dryer makes it possible, in principle, to continue in circulating-air operation for an unlimited period.

Abstract: A method and circuit are provided for on/off control of the compressor of a motor vehicle air conditioner, in which the compressor is shut off when the evaporator temperature measured by an evaporator temperature sensor drops below a presettable shutoff temperature value located above 0.degree. C. The shutoff temperature value is set to fall as a function of the evaporator blower power and/or the temperature of the air drawn in by the evaporator blower with rising blower power or with rising intake air temperature. The circuit includes a control stage whose output signal is fed to an on/off switching element of the compressor and depends on the voltage level at an input node, which varies with the supply voltage of the evaporator blower and/or the output voltage of the intake air temperature sensor.

Abstract: A device for cooling drive components and heating a passenger compartment of an electric vehicle, having a drive motor fed by a battery, comprises a first coolant circuit which is coupled by an intermediate heat exchanger to a second coolant circuit. In the second coolant circuit there is provided a first heat exchanger, acting as a cooling element, and a second heat exchanger, acting as a heating element. The heat exchangers disposed in the second coolant circuit are provided with a respective controllable bypass. A control unit registers a plurality of temperature states and signals derived from the battery control unit and processes these in order to actuate corresponding adjusting and drive means for the flow of the cooling medium.

Abstract: A cooling system for a vehicle having an internal-combustion engine has a plurality of cooling circuits with heat exchangers for each circuit. The temperatures of different cooling media are measured and processed in a switching device to form an output signal which serves to control a fan. In this way, the air flow through the heat exchangers can be varied depending on measured temperature conditions. Individual capacity control of each cooling circuit is possible, thereby preventing unfavorable operating conditions in the individual circuits. The cooling capacity demand of the individual cooling circuits is determined by a central control unit which receives signals from temperature sensors in each circuit. The central control unit includes a microprocessor. Each cooling circuit has an actuating means for individually controlling the capacity of the relevant heat exchanger.

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.