A control mechanism for controlling a plurality of movable elements of a ventilation nozzle using only one drive. The control mechanism includes a base body, a control gate, and at least two driven elements. A sliding block element having two degrees of freedom with respect to the base body is guided by alternating movements in two opposite directions of the first degree of freedom by the control gate and, in the process, consecutively abuts the first and/or second driven elements. So as to design such a control mechanism as simply as possible, rotational movements are utilized, instead of translatory movements.

An air conditioning device for a vehicle has an air-conditioning case, a heater core, a first air mix door, a second air mix door, and an actuator. The air-conditioning case therein has a first air passage and a second air passage. The first air mix door and the second air mix door are arranged in the first air passage and the second air passage respectively, and adjust a ratio between a flow rate of air passing through the heater core and a flow rate of air bypassing the heater core by an opening/closing operation. The actuator interlocks the opening/closing operations of the first air mix door and the second air mix door such that opening degrees of the first air mix door and the second air mix door are different from each other.

A fluid flow controller includes a housing defining a first and a second fluid path. A first door is in the first fluid path to selectably control a first flow through the first fluid path in response to a rotation of a first lever. A second door is in the second fluid path to selectably control a second flow through the second fluid path in response to a rotation of a second lever. A flexible kinematic link is to connect an actuator arm rotatable about an actuator arm axis to the first lever via first pin joints for rotation of the first door about the first pivot axis. A flexible link length is responsive to a compressive and a tensile load. A rigid link is to connect the actuator arm to the second lever via second pin joints for rotation of the second door about the second pivot axis.

Methods and systems include an actuator 40 adapted to provide drive power and hold power to an external device. A motor 34 provides for driving the external device to a determined position when the motor 34 is energized. A switching circuit is configured to energize the motor 34 with a high voltage to drive the external device to the determined position and energize the motor 34 with a low voltage to hold the external device in the determined position.

A method for driving an actuator of an HVAC system is provided, and which comprises the steps of: a] determining an actuation command to the actuator; and b] ramping a drive power to the actuator between a steady-state-velocity drive power and a zero-velocity drive power to effect a required acceleration or deceleration to a movable member of the HAVC system without or substantially without over-powering of the actuator. An HVAC system is also provided. The HVAC system implementing the above method is not only capable of reducing the noise produced by an HVAC system, but is also capable of reducing an over-powering of the actuator when there is a low load on the system.

A method of maintaining a position of an airflow-direction control element 16 of a HVAC system, comprising the steps of, a] determining a position of at least one movable member of an airflow-direction control mechanism of the HVAC system; and b] calculating whether the movable member is at a target position associated with a required position of the airflow-direction control element, and if not, activating an airflow-direction-controller actuator of the HVAC system to effect a change in the position of the movable member thereby bringing the airflow-direction control element to or towards the said required position. A HVAC system suitable for implementing such a method is also provided and capable of improving the overall efficiency of operation.

The invention relates to a device for controlling an element, such as a shutter, for a motor vehicle heating, ventilation and/or air conditioning system, comprising: —an arm (31) comprising an opening (3) so as to define a ring the inner circumference (4) of which at least partially comprises a rack (5) and an axial retaining means (14), —a toothed wheel (11) intended to be rigidly connected to an axis and shaped to cooperate with the axial retaining means (14) and the rack (5) so as to cause the element to move.

A vehicular air conditioning system and a control method thereof are provided. The vehicular air conditioning system includes: a plurality of mode doors configured to switch an air discharge mode in a passenger compartment, the mode doors including a defogging door, a vent door and a floor door; and a mode door air pressure reduction part configured to temporarily reduce an air pressure acting on at least one of the mode doors when the air discharge mode is switched.

A ventilation device may include a housing, a fluid channel system, a heat exchanger, and a slider arrangement. The slider arrangement may include at least one first slider and at least one second slider arranged within the fluid channel system upstream of the heat exchanger and downstream of the heat exchanger respectively. The first and second slider may be guidable transversely with respect to at least one fluid flow. The first and second slider may each be actuatable. At least one of a volume flow and a mass flow of at least one fluid flow may be at least one of controllable and regulatable via actuation of the first slider. At least one of a predetermined fluid temperature and a predeterminable fluid temperature of a mixed fluid may be settable and at least two fluids may be mixable via actuation of the second slider.

An (HVAC) system having an HVAC case. An airflow control member is mounted within the HVAC case. A first magnet is at or adjacent to the axis of rotation and movable along with the airflow control member. The first magnet generates a first magnetic field. A second magnet is spaced apart from the first magnet. The second magnet generates a second magnetic field having a polarity that is opposite to the first magnetic field. Magnetic cooperation between the first magnet and the second magnet provides a magnetic linkage for rotating the airflow control member within the HVAC case.